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Export of internal Abseil changes.

Browse source 
--
78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer <asoffer@google.com>:

internal changes

PiperOrigin-RevId: 247073879

--
7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro <dmauro@google.com>:

Release commandline flags

PiperOrigin-RevId: 247065920

--
2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck <shreck@google.com>:

Add documentation for built-in usage flags

PiperOrigin-RevId: 247058863

--
14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 247058292

--
ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team <absl-team@google.com>:

Internal Change.

PiperOrigin-RevId: 246828655

--
e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 246822325

--
907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier <ericwf@google.com>:

Accept vector<bool>::reference in StrCat and friends.

Converting vector<bool>::reference to alphanum requires
two user defined conversions, which isn't allowed.
In order to accept this, we need a special constructor that
is only enabled for the bool proxy types.

PiperOrigin-RevId: 246626732

--
fe4295fa95cc65dee8c881ba12dd8f516e68c40d by Abseil Team <absl-team@google.com>:

Clarify the proper way to define AbslHashValue, and fix confusing indentation.

PiperOrigin-RevId: 246406528

--
d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental <rogeeff@google.com>:

Internal change

PiperOrigin-RevId: 246358214

--
a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team <absl-team@google.com>:

Fix sample template instantiation.

PiperOrigin-RevId: 246354617

--
29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team <absl-team@google.com>:

Fix incorrectly copy-pasted static_assert in absl::optional::value_or

The static_assert for a move-constructible type previously said the type must be copy-constructible.

PiperOrigin-RevId: 246313827

--
41884d5872d4ea2c67875b00144b8c8a5859a295 by Greg Falcon <gfalcon@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 245418790

--
7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 245412658

--
730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon <gfalcon@google.com>:

internal change

PiperOrigin-RevId: 245293234

--
cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon <gfalcon@google.com>:

Internal change

PiperOrigin-RevId: 245288164
GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515
Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6
This commit is contained in:
Abseil Team 2019-05-07 12:56:42 -07:00 committed by Eric Fiselier
parent cd86d0d20a
commit aa468ad755
46 changed files with 8451 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
absl/CMakeLists.txt
View file

@ -20,6 +20,7 @@ add_subdirectory(base)
add_subdirectory(algorithm)
add_subdirectory(container)
add_subdirectory(debugging)
add_subdirectory(flags)
add_subdirectory(hash)
add_subdirectory(memory)
add_subdirectory(meta)

2
absl/container/internal/raw_hash_set.h
View file

@ -969,7 +969,7 @@ class raw_hash_set {
// This overload kicks in when the argument is an rvalue of init_type. Its
// purpose is to handle brace-init-list arguments.
//
// flat_hash_set<std::string, int> s;
// flat_hash_map<std::string, int> s;
// s.insert({"abc", 42});
std::pair<iterator, bool> insert(init_type&& value) {
return emplace(std::move(value));

1
absl/copts/GENERATED_AbseilCopts.cmake
View file

@ -201,6 +201,7 @@ list(APPEND ABSL_MSVC_FLAGS
"/wd4180"
"/wd4244"
"/wd4267"
"/wd4503"
"/wd4800"
)

1
absl/copts/GENERATED_copts.bzl
View file

@ -202,6 +202,7 @@ ABSL_MSVC_FLAGS = [
"/wd4180",
"/wd4244",
"/wd4267",
"/wd4503",
"/wd4800",
]

6
absl/copts/copts.py
View file

@ -163,8 +163,8 @@ COPT_VARS = {
"ABSL_LLVM_TEST_FLAGS":
LLVM_TEST_DISABLE_WARNINGS_FLAGS,
"ABSL_LLVM_EXCEPTIONS_FLAGS": ["-fexceptions"],
"ABSL_CLANG_CL_FLAGS": (
MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
"ABSL_CLANG_CL_FLAGS":
(MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
"ABSL_CLANG_CL_TEST_FLAGS":
LLVM_TEST_DISABLE_WARNINGS_FLAGS,
"ABSL_CLANG_CL_EXCEPTIONS_FLAGS":
@ -179,6 +179,8 @@ COPT_VARS = {
"/wd4244",
# conversion from 'size_t' to 'type', possible loss of data
"/wd4267",
# The decorated name was longer than the compiler limit
"/wd4503",
# forcing value to bool 'true' or 'false' (performance warning)
"/wd4800",
],

3
absl/copts/generate_copts.py
View file

@ -70,8 +70,9 @@ class StarlarkStyle(object):
return "GENERATED_copts.bzl"
# Copt file generation
def copt_list(name, arg_list, style):
"""Copt file generation."""
make_line = lambda s: " \"" + s + "\"" + style.separator()
external_str_list = [make_line(s) for s in arg_list]

351
absl/flags/BUILD.bazel Normal file
View file

@ -0,0 +1,351 @@
#
# Copyright 2019 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
load(
"//absl:copts/configure_copts.bzl",
"ABSL_DEFAULT_COPTS",
"ABSL_DEFAULT_LINKOPTS",
"ABSL_TEST_COPTS",
)
package(default_visibility = ["//visibility:public"])
licenses(["notice"]) # Apache 2.0
cc_library(
name = "internal",
srcs = [
"internal/program_name.cc",
],
hdrs = [
"internal/path_util.h",
"internal/program_name.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl/flags:__pkg__",
],
deps = [
"//absl/strings",
"//absl/synchronization",
],
)
cc_library(
name = "config",
srcs = [
"usage_config.cc",
],
hdrs = [
"config.h",
"usage_config.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":internal",
"//absl/base:core_headers",
"//absl/strings",
"//absl/synchronization",
],
)
cc_library(
name = "marshalling",
srcs = [
"marshalling.cc",
],
hdrs = [
"marshalling.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
"//absl/base:core_headers",
"//absl/strings",
"//absl/strings:str_format",
],
)
cc_library(
name = "handle",
srcs = [
"internal/commandlineflag.cc",
],
hdrs = [
"internal/commandlineflag.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl/flags:__pkg__",
],
deps = [
":config",
":marshalling",
"//absl/base",
"//absl/base:core_headers",
"//absl/strings",
"//absl/synchronization",
"//absl/types:optional",
],
)
cc_library(
name = "registry",
srcs = [
"internal/registry.cc",
"internal/type_erased.cc",
],
hdrs = [
"internal/registry.h",
"internal/type_erased.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl/flags:__pkg__",
],
deps = [
":config",
":handle",
"//absl/base",
"//absl/base:core_headers",
"//absl/base:dynamic_annotations",
"//absl/strings",
"//absl/synchronization",
],
)
cc_library(
name = "flag",
srcs = [
"flag.cc",
],
hdrs = [
"declare.h",
"flag.h",
"internal/flag.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":handle",
":marshalling",
":registry",
"//absl/base",
"//absl/base:core_headers",
"//absl/strings",
],
)
cc_library(
name = "usage",
srcs = [
"internal/usage.cc",
],
hdrs = [
"internal/usage.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl/flags:__pkg__",
],
deps = [
":config",
":flag",
":handle",
":internal",
"//absl/strings",
"//absl/synchronization",
],
)
cc_library(
name = "parse",
srcs = ["parse.cc"],
hdrs = [
"internal/parse.h",
"parse.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":flag",
":handle",
":internal",
":registry",
":usage",
"//absl/strings",
"//absl/synchronization",
],
)
############################################################################
# Unit tests in alpahabetical order.
cc_test(
name = "commandlineflag_test",
size = "small",
srcs = [
"internal/commandlineflag_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":flag",
":handle",
":registry",
"//absl/memory",
"//absl/strings",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "flag_test",
size = "small",
srcs = [
"flag_test.cc",
"flag_test_defs.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":flag",
"//absl/strings",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "marshalling_test",
size = "small",
srcs = [
"marshalling_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":marshalling",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "path_util_test",
size = "small",
srcs = [
"internal/path_util_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":internal",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "parse_test",
size = "small",
srcs = [
"parse_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":flag",
":parse",
"//absl/base",
"//absl/base:scoped_set_env",
"//absl/strings",
"//absl/types:span",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "program_name_test",
size = "small",
srcs = [
"internal/program_name_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":internal",
"//absl/strings",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "type_erased_test",
size = "small",
srcs = [
"internal/type_erased_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":flag",
":registry",
"//absl/memory",
"//absl/strings",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "usage_config_test",
size = "small",
srcs = [
"usage_config_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":internal",
"//absl/strings",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "usage_test",
size = "small",
srcs = [
"internal/usage_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":flag",
":internal",
":parse",
":usage",
"//absl/memory",
"//absl/strings",
"@com_google_googletest//:gtest",
],
)

317
absl/flags/CMakeLists.txt Normal file
View file

@ -0,0 +1,317 @@
#
# Copyright 2019 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
flags_internal
SRCS
"internal/program_name.cc"
HDRS
"internal/path_util.h"
"internal/program_name.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::strings
absl::synchronization
PUBLIC
)
absl_cc_library(
NAME
flags_config
SRCS
"usage_config.cc"
HDRS
"config.h"
"usage_config.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::flags_internal
absl::core_headers
absl::strings
absl::synchronization
)
absl_cc_library(
NAME
flags_marshalling
SRCS
"marshalling.cc"
HDRS
"marshalling.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::core_headers
absl::strings
absl::str_format
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
flags_handle
SRCS
"internal/commandlineflag.cc"
HDRS
"internal/commandlineflag.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::flags_config
absl::flags_marshalling
absl::base
absl::core_headers
absl::strings
absl::synchronization
absl::optional
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
flags_registry
SRCS
"internal/registry.cc"
"internal/type_erased.cc"
HDRS
"internal/registry.h"
"internal/type_erased.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::flags_config
absl::flags_handle
absl::base
absl::core_headers
absl::dynamic_annotations
absl::strings
absl::synchronization
)
absl_cc_library(
NAME
flags
SRCS
"flag.cc"
HDRS
"declare.h"
"flag.h"
"internal/flag.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::flags_config
absl::flags_handle
absl::flags_marshalling
absl::flags_registry
absl::base
absl::core_headers
absl::strings
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
flags_usage
SRCS
"internal/usage.cc"
HDRS
"internal/usage.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::flags_config
absl::flags
absl::flags_handle
absl::flags_internal
absl::strings
absl::synchronization
)
absl_cc_library(
NAME
flags_parse
SRCS
"parse.cc"
HDRS
"internal/parse.h"
"parse.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::flags_config
absl::flags
absl::flags_handle
absl::flags_internal
absl::flags_registry
absl::flags_usage
absl::strings
absl::synchronization
)
############################################################################
# Unit tests in alpahabetical order.
absl_cc_test(
NAME
flags_commandlineflag_test
SRCS
"internal/commandlineflag_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags
absl::flags_handle
absl::flags_registry
absl::memory
absl::strings
gtest_main
)
absl_cc_test(
NAME
flags_flag_test
SRCS
"flag_test.cc"
"flag_test_defs.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags
absl::strings
gtest_main
)
absl_cc_test(
NAME
flags_marshalling_test
SRCS
"marshalling_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags_marshalling
gtest_main
)
absl_cc_test(
NAME
flags_parse_test
SRCS
"parse_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags
absl::base
absl::flags_parse
absl::scoped_set_env
absl::span
absl::strings
gmock_main
)
absl_cc_test(
NAME
flags_path_util_test
SRCS
"internal/path_util_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags_internal
gtest_main
)
absl_cc_test(
NAME
flags_program_name_test
SRCS
"internal/program_name_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags_internal
absl::strings
gtest_main
)
absl_cc_test(
NAME
flags_type_erased_test
SRCS
"internal/type_erased_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags
absl::flags_registry
absl::memory
absl::strings
gtest_main
)
absl_cc_test(
NAME
flags_usage_config_test
SRCS
"usage_config_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags_config
absl::flags_internal
absl::strings
gtest_main
)
absl_cc_test(
NAME
flags_usage_test
SRCS
"internal/usage_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::flags_config
absl::flags
absl::flags_internal
absl::flags_parse
absl::flags_usage
absl::memory
absl::strings
gtest
)

54
absl/flags/config.h Normal file
View file

@ -0,0 +1,54 @@
//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_CONFIG_H_
#define ABSL_FLAGS_CONFIG_H_
// Determine if we should strip string literals from the Flag objects.
#if !defined(ABSL_FLAGS_STRIP_NAMES)
// Non-mobile linux platforms don't strip string literals.
#if (defined(__linux__) || defined(__Fuchsia__)) && !defined(__ANDROID__)
#define ABSL_FLAGS_STRIP_NAMES 0
// So do Macs (not iOS or embedded Apple platforms).
#elif defined(__APPLE__)
#include <TargetConditionals.h>
#if !TARGET_OS_IPHONE && !TARGET_OS_EMBEDDED
#define ABSL_FLAGS_STRIP_NAMES 0
#endif
// And Windows.
#elif defined(_WIN32)
#define ABSL_FLAGS_STRIP_NAMES 0
// And Myriad.
#elif defined(__myriad2__)
#define ABSL_FLAGS_STRIP_NAMES 0
#endif
#endif // !defined(ABSL_FLAGS_STRIP_NAMES)
#if ABSL_FLAGS_STRIP_NAMES
#if !defined(ABSL_FLAGS_STRIP_HELP)
#define ABSL_FLAGS_STRIP_HELP 1
#endif
#else
#if !defined(ABSL_FLAGS_STRIP_HELP)
#define ABSL_FLAGS_STRIP_HELP 0
#endif
#endif
#endif // ABSL_FLAGS_CONFIG_H_

58
absl/flags/declare.h Normal file
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@ -0,0 +1,58 @@
//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: declare.h
// -----------------------------------------------------------------------------
//
// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an
// `absl::Flag` for use within a translation unit. You should place this
// declaration within the header file associated with the .cc file that defines
// and owns the `Flag`.
#ifndef ABSL_FLAGS_DECLARE_H_
#define ABSL_FLAGS_DECLARE_H_
#include "absl/strings/string_view.h"
namespace absl {
namespace flags_internal {
// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.
template <typename T>
class Flag;
} // namespace flags_internal
// Flag
//
// Forward declaration of the `absl::Flag` type for use in defining the macro.
template <typename T>
using Flag = flags_internal::Flag<T>;
} // namespace absl
// ABSL_DECLARE_FLAG()
//
// This macro is a convenience for declaring use of an `absl::Flag` within a
// translation unit. This macro should be used within a header file to
// declare usage of the flag within any .cc file including that header file.
//
// The ABSL_DECLARE_FLAG(type, name) macro expands to:
//
// extern absl::Flag<type> FLAGS_name;
#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name
#endif // ABSL_FLAGS_DECLARE_H_

52
absl/flags/flag.cc Normal file
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@ -0,0 +1,52 @@
//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/flag.h"
#include <cstring>
namespace absl {
// We want to validate the type mismatch between type definition and
// declaration. The lock-free implementation does not allow us to do it,
// so in debug builds we always use the slower implementation, which always
// validates the type.
#ifndef NDEBUG
#define ABSL_FLAGS_ATOMIC_GET(T) \
T GetFlag(const absl::Flag<T>& flag) { \
T result; \
flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
return result; \
}
#else
#define ABSL_FLAGS_ATOMIC_GET(T) \
T GetFlag(const absl::Flag<T>& flag) { \
const int64_t r = flag.internal.atomic.load(std::memory_order_acquire); \
if (r != flags_internal::CommandLineFlag::kAtomicInit) { \
T t; \
memcpy(&t, &r, sizeof(T)); \
return t; \
} \
T result; \
flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
return result; \
}
#endif
ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_ATOMIC_GET)
#undef ABSL_FLAGS_ATOMIC_GET
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: flag.h
// -----------------------------------------------------------------------------
//
// This header file defines the `absl::Flag<T>` type for holding command-line
// flag data, and abstractions to create, get and set such flag data.
//
// It is important to note that this type is **unspecified** (an implementation
// detail) and you do not construct or manipulate actual `absl::Flag<T>`
// instances. Instead, you define and declare flags using the
// `ABSL_FLAG()` and `ABSL_DECLARE_FLAG()` macros, and get and set flag values
// using the `absl::GetFlag()` and `absl::SetFlag()` functions.
#ifndef ABSL_FLAGS_FLAG_H_
#define ABSL_FLAGS_FLAG_H_
#include "absl/base/attributes.h"
#include "absl/base/casts.h"
#include "absl/flags/config.h"
#include "absl/flags/declare.h"
#include "absl/flags/internal/commandlineflag.h"
#include "absl/flags/internal/flag.h"
#include "absl/flags/marshalling.h"
namespace absl {
// Flag
//
// An `absl::Flag` holds a command-line flag value, providing a runtime
// parameter to a binary. Such flags should be defined in the global namespace
// and (preferably) in the module containing the binary's `main()` function.
//
// You should not construct and cannot use the `absl::Flag` type directly;
// instead, you should declare flags using the `ABSL_DECLARE_FLAG()` macro
// within a header file, and define your flag using `ABSL_FLAG()` within your
// header's associated `.cc` file. Such flags will be named `FLAGS_name`.
//
// Example:
//
// .h file
//
// // Declares usage of a flag named "FLAGS_count"
// ABSL_DECLARE_FLAG(int, count);
//
// .cc file
//
// // Defines a flag named "FLAGS_count" with a default `int` value of 0.
// ABSL_FLAG(int, count, 0, "Count of items to process");
//
// No public methods of `absl::Flag<T>` are part of the Abseil Flags API.
template <typename T>
using Flag = flags_internal::Flag<T>;
// GetFlag()
//
// Returns the value (of type `T`) of an `absl::Flag<T>` instance, by value. Do
// not construct an `absl::Flag<T>` directly and call `absl::GetFlag()`;
// instead, refer to flag's constructed variable name (e.g. `FLAGS_name`).
// Because this function returns by value and not by reference, it is
// thread-safe, but note that the operation may be expensive; as a result, avoid
// `absl::GetFlag()` within any tight loops.
//
// Example:
//
// // FLAGS_count is a Flag of type `int`
// int my_count = absl::GetFlag(FLAGS_count);
//
// // FLAGS_firstname is a Flag of type `std::string`
// std::string first_name = absl::GetFlag(FLAGS_firstname);
template <typename T>
T GetFlag(const absl::Flag<T>& flag) {
#define ABSL_FLAGS_INTERNAL_LOCK_FREE_VALIDATE(BIT) \
static_assert( \
!std::is_same<T, BIT>::value, \
"Do not specify explicit template parameters to absl::GetFlag");
ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_INTERNAL_LOCK_FREE_VALIDATE)
#undef ABSL_FLAGS_INTERNAL_LOCK_FREE_VALIDATE
// Implementation notes:
//
// We are wrapping a union around the value of `T` to serve three purposes:
//
// 1. `U.value` has correct size and alignment for a value of type `T`
// 2. The `U.value` constructor is not invoked since U's constructor does not
// do it explicitly.
// 3. The `U.value` destructor is invoked since U's destructor does it
// explicitly. This makes `U` a kind of RAII wrapper around non default
// constructible value of T, which is destructed when we leave the scope.
// We do need to destroy U.value, which is constructed by
// CommandLineFlag::Read even though we left it in a moved-from state
// after std::move.
//
// All of this serves to avoid requiring `T` being default constructible.
union U {
T value;
U() {}
~U() { value.~T(); }
};
U u;
flag.internal.Read(&u.value, &flags_internal::FlagOps<T>);
return std::move(u.value);
}
// Overload for `GetFlag()` for types that support lock-free reads.
#define ABSL_FLAGS_INTERNAL_LOCK_FREE_EXPORT(T) \
extern T GetFlag(const absl::Flag<T>& flag);
ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_INTERNAL_LOCK_FREE_EXPORT)
#undef ABSL_FLAGS_INTERNAL_LOCK_FREE_EXPORT
// SetFlag()
//
// Sets the value of an `absl::Flag` to the value `v`. Do not construct an
// `absl::Flag<T>` directly and call `absl::SetFlag()`; instead, use the
// flag's variable name (e.g. `FLAGS_name`). This function is
// thread-safe, but is potentially expensive. Avoid setting flags in general,
// but especially within performance-critical code.
template <typename T>
void SetFlag(absl::Flag<T>* flag, const T& v) {
flag->internal.Write(&v, &flags_internal::FlagOps<T>);
}
// Overload of `SetFlag()` to allow callers to pass in a value that is
// convertible to `T`. E.g., use this overload to pass a "const char*" when `T`
// is `std::string`.
template <typename T, typename V>
void SetFlag(absl::Flag<T>* flag, const V& v) {
T value(v);
SetFlag<T>(flag, value);
}
} // namespace absl
// ABSL_FLAG()
//
// This macro defines an `absl::Flag<T>` instance of a specified type `T`:
//
// ABSL_FLAG(T, name, default_value, help);
//
// where:
//
// * `T` is a supported flag type (See below),
// * `name` designates the name of the flag (as a global variable
// `FLAGS_name`),
// * `default_value` is an expression holding the default value for this flag
// (which must be implicitly convertible to `T`),
// * `help` is the help text, which can also be an expression.
//
// This macro expands to a flag named 'FLAGS_name' of type 'T':
//
// absl::Flag<T> FLAGS_name = ...;
//
// Note that all such instances are created as global variables.
//
// For `ABSL_FLAG()` values that you wish to expose to other translation units,
// it is recommended to define those flags within the `.cc` file associated with
// the header where the flag is declared.
//
// Note: do not construct objects of type `absl::Flag<T>` directly. Only use the
// `ABSL_FLAG()` macro for such construction.
#define ABSL_FLAG(Type, name, default_value, help) \
ABSL_FLAG_IMPL(Type, name, default_value, help)
// ABSL_FLAG().OnUpdate()
//
// Defines a flag of type `T` with a callback attached:
//
// ABSL_FLAG(T, name, default_value, help).OnUpdate(callback);
//
// After any setting of the flag value, the callback will be called at least
// once. A rapid sequence of changes may be merged together into the same
// callback. No concurrent calls to the callback will be made for the same
// flag. Callbacks are allowed to read the current value of the flag but must
// not mutate that flag.
//
// The update mechanism guarantees "eventual consistency"; if the callback
// derives an auxiliary data structure from the flag value, it is guaranteed
// that eventually the flag value and the derived data structure will be
// consistent.
//
// Note: ABSL_FLAG.OnUpdate() does not have a public definition. Hence, this
// comment serves as its API documentation.
// -----------------------------------------------------------------------------
// Implementation details below this section
// -----------------------------------------------------------------------------
// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_NAMES
#if ABSL_FLAGS_STRIP_NAMES
#define ABSL_FLAG_IMPL_FLAGNAME(txt) ""
#define ABSL_FLAG_IMPL_FILENAME() ""
#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
absl::flags_internal::FlagRegistrar<T, false>(&flag)
#else
#define ABSL_FLAG_IMPL_FLAGNAME(txt) txt
#define ABSL_FLAG_IMPL_FILENAME() __FILE__
#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
absl::flags_internal::FlagRegistrar<T, true>(&flag)
#endif
// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_HELP
#if ABSL_FLAGS_STRIP_HELP
#define ABSL_FLAG_IMPL_FLAGHELP(txt) absl::flags_internal::kStrippedFlagHelp
#else
#define ABSL_FLAG_IMPL_FLAGHELP(txt) txt
#endif
#define ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, txt) \
static std::string AbslFlagsWrapHelp##name() { \
return ABSL_FLAG_IMPL_FLAGHELP(txt); \
}
#define ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
static void* AbslFlagsInitFlag##name() { \
return absl::flags_internal::MakeFromDefaultValue<Type>(default_value); \
}
// ABSL_FLAG_IMPL
//
// Note: Name of registrar object is not arbitrary. It is used to "grab"
// global name for FLAGS_no<flag_name> symbol, thus preventing the possibility
// of defining two flags with names foo and nofoo.
#define ABSL_FLAG_IMPL(Type, name, default_value, help) \
namespace absl {} \
ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help) \
absl::Flag<Type> FLAGS_##name( \
ABSL_FLAG_IMPL_FLAGNAME(#name), \
&AbslFlagsWrapHelp##name, \
ABSL_FLAG_IMPL_FILENAME(), \
&absl::flags_internal::FlagMarshallingOps<Type>, \
&AbslFlagsInitFlag##name); \
extern bool FLAGS_no##name; \
bool FLAGS_no##name = ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
// ABSL_RETIRED_FLAG
//
// Designates the flag (which is usually pre-existing) as "retired." A retired
// flag is a flag that is now unused by the program, but may still be passed on
// the command line, usually by production scripts. A retired flag is ignored
// and code can't access it at runtime.
//
// This macro registers a retired flag with given name and type, with a name
// identical to the name of the original flag you are retiring. The retired
// flag's type can change over time, so that you can retire code to support a
// custom flag type.
//
// This macro has the same signature as `ABSL_FLAG`. To retire a flag, simply
// replace an `ABSL_FLAG` definition with `ABSL_RETIRED_FLAG`, leaving the
// arguments unchanged (unless of course you actually want to retire the flag
// type at this time as well).
//
// `default_value` is only used as a double check on the type. `explanation` is
// unused.
// TODO(rogeeff): Return an anonymous struct instead of bool, and place it into
// the unnamed namespace.
#define ABSL_RETIRED_FLAG(type, flagname, default_value, explanation) \
ABSL_ATTRIBUTE_UNUSED static const bool ignored_##flagname = \
([] { return type(default_value); }, \
absl::flags_internal::RetiredFlag<type>(#flagname))
#endif // ABSL_FLAGS_FLAG_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/flag.h"
#include "gtest/gtest.h"
#include "absl/strings/match.h"
#include "absl/strings/numbers.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
ABSL_DECLARE_FLAG(int64_t, mistyped_int_flag);
ABSL_DECLARE_FLAG(std::vector<std::string>, mistyped_string_flag);
namespace {
namespace flags = absl::flags_internal;
std::string TestHelpMsg() { return "help"; }
template <typename T>
void* TestMakeDflt() {
return new T{};
}
void TestCallback() {}
template <typename T>
bool TestConstructionFor() {
constexpr flags::Flag<T> f1("f1", &TestHelpMsg, "file",
&absl::flags_internal::FlagMarshallingOps<T>,
&TestMakeDflt<T>);
EXPECT_EQ(f1.Name(), "f1");
EXPECT_EQ(f1.Help(), "help");
EXPECT_EQ(f1.Filename(), "file");
ABSL_CONST_INIT static flags::Flag<T> f2(
"f2", &TestHelpMsg, "file", &absl::flags_internal::FlagMarshallingOps<T>,
&TestMakeDflt<T>);
flags::FlagRegistrar<T, false>(&f2).OnUpdate(TestCallback);
EXPECT_EQ(f2.Name(), "f2");
EXPECT_EQ(f2.Help(), "help");
EXPECT_EQ(f2.Filename(), "file");
return true;
}
struct UDT {
UDT() = default;
UDT(const UDT&) = default;
};
bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
std::string AbslUnparseFlag(const UDT&) { return ""; }
TEST(FlagTest, TestConstruction) {
TestConstructionFor<bool>();
TestConstructionFor<int16_t>();
TestConstructionFor<uint16_t>();
TestConstructionFor<int32_t>();
TestConstructionFor<uint32_t>();
TestConstructionFor<int64_t>();
TestConstructionFor<uint64_t>();
TestConstructionFor<double>();
TestConstructionFor<float>();
TestConstructionFor<std::string>();
TestConstructionFor<UDT>();
}
// --------------------------------------------------------------------
} // namespace
ABSL_DECLARE_FLAG(bool, test_flag_01);
ABSL_DECLARE_FLAG(int, test_flag_02);
ABSL_DECLARE_FLAG(int16_t, test_flag_03);
ABSL_DECLARE_FLAG(uint16_t, test_flag_04);
ABSL_DECLARE_FLAG(int32_t, test_flag_05);
ABSL_DECLARE_FLAG(uint32_t, test_flag_06);
ABSL_DECLARE_FLAG(int64_t, test_flag_07);
ABSL_DECLARE_FLAG(uint64_t, test_flag_08);
ABSL_DECLARE_FLAG(double, test_flag_09);
ABSL_DECLARE_FLAG(float, test_flag_10);
ABSL_DECLARE_FLAG(std::string, test_flag_11);
namespace {
#if !ABSL_FLAGS_STRIP_NAMES
TEST(FlagTest, TestFlagDeclaration) {
// test that we can access flag objects.
EXPECT_EQ(FLAGS_test_flag_01.Name(), "test_flag_01");
EXPECT_EQ(FLAGS_test_flag_02.Name(), "test_flag_02");
EXPECT_EQ(FLAGS_test_flag_03.Name(), "test_flag_03");
EXPECT_EQ(FLAGS_test_flag_04.Name(), "test_flag_04");
EXPECT_EQ(FLAGS_test_flag_05.Name(), "test_flag_05");
EXPECT_EQ(FLAGS_test_flag_06.Name(), "test_flag_06");
EXPECT_EQ(FLAGS_test_flag_07.Name(), "test_flag_07");
EXPECT_EQ(FLAGS_test_flag_08.Name(), "test_flag_08");
EXPECT_EQ(FLAGS_test_flag_09.Name(), "test_flag_09");
EXPECT_EQ(FLAGS_test_flag_10.Name(), "test_flag_10");
EXPECT_EQ(FLAGS_test_flag_11.Name(), "test_flag_11");
}
#endif // !ABSL_FLAGS_STRIP_NAMES
// --------------------------------------------------------------------
} // namespace
ABSL_FLAG(bool, test_flag_01, true, "test flag 01");
ABSL_FLAG(int, test_flag_02, 1234, "test flag 02");
ABSL_FLAG(int16_t, test_flag_03, -34, "test flag 03");
ABSL_FLAG(uint16_t, test_flag_04, 189, "test flag 04");
ABSL_FLAG(int32_t, test_flag_05, 10765, "test flag 05");
ABSL_FLAG(uint32_t, test_flag_06, 40000, "test flag 06");
ABSL_FLAG(int64_t, test_flag_07, -1234567, "test flag 07");
ABSL_FLAG(uint64_t, test_flag_08, 9876543, "test flag 08");
ABSL_FLAG(double, test_flag_09, -9.876e-50, "test flag 09");
ABSL_FLAG(float, test_flag_10, 1.234e12f, "test flag 10");
ABSL_FLAG(std::string, test_flag_11, "", "test flag 11");
namespace {
#if !ABSL_FLAGS_STRIP_NAMES
TEST(FlagTest, TestFlagDefinition) {
absl::string_view expected_file_name = "absl/flags/flag_test.cc";
EXPECT_EQ(FLAGS_test_flag_01.Name(), "test_flag_01");
EXPECT_EQ(FLAGS_test_flag_01.Help(), "test flag 01");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_01.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_02.Name(), "test_flag_02");
EXPECT_EQ(FLAGS_test_flag_02.Help(), "test flag 02");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_02.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_03.Name(), "test_flag_03");
EXPECT_EQ(FLAGS_test_flag_03.Help(), "test flag 03");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_03.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_04.Name(), "test_flag_04");
EXPECT_EQ(FLAGS_test_flag_04.Help(), "test flag 04");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_04.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_05.Name(), "test_flag_05");
EXPECT_EQ(FLAGS_test_flag_05.Help(), "test flag 05");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_05.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_06.Name(), "test_flag_06");
EXPECT_EQ(FLAGS_test_flag_06.Help(), "test flag 06");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_06.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_07.Name(), "test_flag_07");
EXPECT_EQ(FLAGS_test_flag_07.Help(), "test flag 07");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_07.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_08.Name(), "test_flag_08");
EXPECT_EQ(FLAGS_test_flag_08.Help(), "test flag 08");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_08.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_09.Name(), "test_flag_09");
EXPECT_EQ(FLAGS_test_flag_09.Help(), "test flag 09");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_09.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_10.Name(), "test_flag_10");
EXPECT_EQ(FLAGS_test_flag_10.Help(), "test flag 10");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_10.Filename(), expected_file_name));
EXPECT_EQ(FLAGS_test_flag_11.Name(), "test_flag_11");
EXPECT_EQ(FLAGS_test_flag_11.Help(), "test flag 11");
EXPECT_TRUE(
absl::EndsWith(FLAGS_test_flag_11.Filename(), expected_file_name));
}
#endif // !ABSL_FLAGS_STRIP_NAMES
// --------------------------------------------------------------------
TEST(FlagTest, TestDefault) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
}
// --------------------------------------------------------------------
TEST(FlagTest, TestGetSet) {
absl::SetFlag(&FLAGS_test_flag_01, false);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), false);
absl::SetFlag(&FLAGS_test_flag_02, 321);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 321);
absl::SetFlag(&FLAGS_test_flag_03, 67);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), 67);
absl::SetFlag(&FLAGS_test_flag_04, 1);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 1);
absl::SetFlag(&FLAGS_test_flag_05, -908);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), -908);
absl::SetFlag(&FLAGS_test_flag_06, 4001);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 4001);
absl::SetFlag(&FLAGS_test_flag_07, -23456);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -23456);
absl::SetFlag(&FLAGS_test_flag_08, 975310);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 975310);
absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), 1.00001, 1e-10);
absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), -3.54f, 1e-6f);
absl::SetFlag(&FLAGS_test_flag_11, "asdf");
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "asdf");
}
// --------------------------------------------------------------------
int GetDflt1() { return 1; }
} // namespace
ABSL_FLAG(int, test_flag_12, GetDflt1(), "test flag 12");
ABSL_FLAG(std::string, test_flag_13, absl::StrCat("AAA", "BBB"),
"test flag 13");
namespace {
TEST(FlagTest, TestNonConstexprDefault) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), 1);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), "AAABBB");
}
// --------------------------------------------------------------------
} // namespace
ABSL_FLAG(bool, test_flag_14, true, absl::StrCat("test ", "flag ", "14"));
namespace {
#if !ABSL_FLAGS_STRIP_HELP
TEST(FlagTest, TestNonConstexprHelp) {
EXPECT_EQ(FLAGS_test_flag_14.Help(), "test flag 14");
}
#endif //! ABSL_FLAGS_STRIP_HELP
// --------------------------------------------------------------------
int cb_test_value = -1;
void TestFlagCB();
} // namespace
ABSL_FLAG(int, test_flag_with_cb, 100, "").OnUpdate(TestFlagCB);
ABSL_FLAG(int, test_flag_with_lambda_cb, 200, "").OnUpdate([]() {
cb_test_value = absl::GetFlag(FLAGS_test_flag_with_lambda_cb) +
absl::GetFlag(FLAGS_test_flag_with_cb);
});
namespace {
void TestFlagCB() { cb_test_value = absl::GetFlag(FLAGS_test_flag_with_cb); }
// Tests side-effects of callback invocation.
TEST(FlagTest, CallbackInvocation) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_cb), 100);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_lambda_cb), 200);
EXPECT_EQ(cb_test_value, 300);
absl::SetFlag(&FLAGS_test_flag_with_cb, 1);
EXPECT_EQ(cb_test_value, 1);
absl::SetFlag(&FLAGS_test_flag_with_lambda_cb, 3);
EXPECT_EQ(cb_test_value, 4);
}
// --------------------------------------------------------------------
struct CustomUDT {
CustomUDT() : a(1), b(1) {}
CustomUDT(int a_, int b_) : a(a_), b(b_) {}
friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
return f1.a == f2.a && f1.b == f2.b;
}
int a;
int b;
};
bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
std::vector<absl::string_view> parts =
absl::StrSplit(in, ':', absl::SkipWhitespace());
if (parts.size() != 2) return false;
if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
return true;
}
std::string AbslUnparseFlag(const CustomUDT& f) {
return absl::StrCat(f.a, ":", f.b);
}
} // namespace
ABSL_FLAG(CustomUDT, test_flag_15, CustomUDT(), "test flag 15");
namespace {
TEST(FlagTest, TestCustomUDT) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_15), CustomUDT(1, 1));
absl::SetFlag(&FLAGS_test_flag_15, CustomUDT(2, 3));
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_15), CustomUDT(2, 3));
}
// MSVC produces link error on the type mismatch.
// Linux does not have build errors and validations work as expected.
#if 0 // !defined(_WIN32) && GTEST_HAS_DEATH_TEST
TEST(Flagtest, TestTypeMismatchValidations) {
// For builtin types, GetFlag() only does validation in debug mode.
EXPECT_DEBUG_DEATH(
absl::GetFlag(FLAGS_mistyped_int_flag),
"Flag 'mistyped_int_flag' is defined as one type and declared "
"as another");
EXPECT_DEATH(absl::SetFlag(&FLAGS_mistyped_int_flag, 0),
"Flag 'mistyped_int_flag' is defined as one type and declared "
"as another");
EXPECT_DEATH(absl::GetFlag(FLAGS_mistyped_string_flag),
"Flag 'mistyped_string_flag' is defined as one type and "
"declared as another");
EXPECT_DEATH(
absl::SetFlag(&FLAGS_mistyped_string_flag, std::vector<std::string>{}),
"Flag 'mistyped_string_flag' is defined as one type and declared as "
"another");
}
#endif
// --------------------------------------------------------------------
// A contrived type that offers implicit and explicit conversion from specific
// source types.
struct ConversionTestVal {
ConversionTestVal() = default;
explicit ConversionTestVal(int a_in) : a(a_in) {}
enum class ViaImplicitConv { kTen = 10, kEleven };
// NOLINTNEXTLINE
ConversionTestVal(ViaImplicitConv from) : a(static_cast<int>(from)) {}
int a;
};
bool AbslParseFlag(absl::string_view in, ConversionTestVal* val_out,
std::string*) {
if (!absl::SimpleAtoi(in, &val_out->a)) {
return false;
}
return true;
}
std::string AbslUnparseFlag(const ConversionTestVal& val) {
return absl::StrCat(val.a);
}
} // namespace
// Flag default values can be specified with a value that converts to the flag
// value type implicitly.
ABSL_FLAG(ConversionTestVal, test_flag_16,
ConversionTestVal::ViaImplicitConv::kTen, "test flag 16");
namespace {
TEST(FlagTest, CanSetViaImplicitConversion) {
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_16).a, 10);
absl::SetFlag(&FLAGS_test_flag_16,
ConversionTestVal::ViaImplicitConv::kEleven);
EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_16).a, 11);
}
// --------------------------------------------------------------------
struct NonDfltConstructible {
public:
// This constructor tests that we can initialize the flag with int value
NonDfltConstructible(int i) : value(i) {} // NOLINT
// This constructor tests that we can't initialize the flag with char value
// but can with explicitly constructed NonDfltConstructible.
explicit NonDfltConstructible(char c) : value(100 + static_cast<int>(c)) {}
int value;
};
bool AbslParseFlag(absl::string_view in, NonDfltConstructible* ndc_out,
std::string*) {
return absl::SimpleAtoi(in, &ndc_out->value);
}
std::string AbslUnparseFlag(const NonDfltConstructible& ndc) {
return absl::StrCat(ndc.value);
}
} // namespace
ABSL_FLAG(NonDfltConstructible, ndc_flag1, NonDfltConstructible('1'),
"Flag with non default constructible type");
ABSL_FLAG(NonDfltConstructible, ndc_flag2, 0,
"Flag with non default constructible type");
namespace {
TEST(FlagTest, TestNonDefaultConstructibleType) {
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, '1' + 100);
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 0);
absl::SetFlag(&FLAGS_ndc_flag1, NonDfltConstructible('A'));
absl::SetFlag(&FLAGS_ndc_flag2, 25);
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, 'A' + 100);
EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 25);
}
// --------------------------------------------------------------------
} // namespace
ABSL_RETIRED_FLAG(bool, old_bool_flag, true, "old descr");
ABSL_RETIRED_FLAG(int, old_int_flag, (int)std::sqrt(10), "old descr");
ABSL_RETIRED_FLAG(std::string, old_str_flag, "", absl::StrCat("old ", "descr"));
namespace {
TEST(FlagTest, TestRetiredFlagRegistration) {
bool is_bool = false;
EXPECT_TRUE(flags::IsRetiredFlag("old_bool_flag", &is_bool));
EXPECT_TRUE(is_bool);
EXPECT_TRUE(flags::IsRetiredFlag("old_int_flag", &is_bool));
EXPECT_FALSE(is_bool);
EXPECT_TRUE(flags::IsRetiredFlag("old_str_flag", &is_bool));
EXPECT_FALSE(is_bool);
EXPECT_FALSE(flags::IsRetiredFlag("some_other_flag", &is_bool));
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file is used to test the mismatch of the flag type between definition
// and declaration. These are definitions. flag_test.cc contains declarations.
#include <string>
#include "absl/flags/flag.h"
ABSL_FLAG(int, mistyped_int_flag, 0, "");
ABSL_FLAG(std::string, mistyped_string_flag, "", "");

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/commandlineflag.h"
#include <cassert>
#include "absl/base/internal/raw_logging.h"
#include "absl/base/optimization.h"
#include "absl/flags/config.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/str_cat.h"
#include "absl/synchronization/mutex.h"
namespace absl {
namespace flags_internal {
// The help message indicating that the commandline flag has been
// 'stripped'. It will not show up when doing "-help" and its
// variants. The flag is stripped if ABSL_FLAGS_STRIP_HELP is set to 1
// before including absl/flags/flag.h
// This is used by this file, and also in commandlineflags_reporting.cc
const char kStrippedFlagHelp[] = "\001\002\003\004 (unknown) \004\003\002\001";
namespace {
void StoreAtomic(CommandLineFlag* flag, const void* data, size_t size) {
int64_t t = 0;
assert(size <= sizeof(int64_t));
memcpy(&t, data, size);
flag->atomic.store(t, std::memory_order_release);
}
// If the flag has a mutation callback this function invokes it. While the
// callback is being invoked the primary flag's mutex is unlocked and it is
// re-locked back after call to callback is completed. Callback invocation is
// guarded by flag's secondary mutex instead which prevents concurrent callback
// invocation. Note that it is possible for other thread to grab the primary
// lock and update flag's value at any time during the callback invocation.
// This is by design. Callback can get a value of the flag if necessary, but it
// might be different from the value initiated the callback and it also can be
// different by the time the callback invocation is completed.
// Requires that *primary_lock be held in exclusive mode; it may be released
// and reacquired by the implementation.
void InvokeCallback(CommandLineFlag* flag, absl::Mutex* primary_lock)
EXCLUSIVE_LOCKS_REQUIRED(primary_lock) {
if (!flag->callback) return;
// The callback lock is guaranteed initialized, because *primary_lock exists.
absl::Mutex* callback_mu = &flag->locks->callback_mu;
// When executing the callback we need the primary flag's mutex to be unlocked
// so that callback can retrieve the flag's value.
primary_lock->Unlock();
{
absl::MutexLock lock(callback_mu);
flag->callback();
}
primary_lock->Lock();
}
// Currently we only validate flag values for user-defined flag types.
bool ShouldValidateFlagValue(const CommandLineFlag& flag) {
#define DONT_VALIDATE(T) \
if (flag.IsOfType<T>()) return false;
ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(DONT_VALIDATE)
DONT_VALIDATE(std::string)
DONT_VALIDATE(std::vector<std::string>)
#undef DONT_VALIDATE
return true;
}
} // namespace
// Update any copy of the flag value that is stored in an atomic word.
// In addition if flag has a mutation callback this function invokes it.
void UpdateCopy(CommandLineFlag* flag, absl::Mutex* primary_lock)
EXCLUSIVE_LOCKS_REQUIRED(primary_lock) {
#define STORE_ATOMIC(T) \
else if (flag->IsOfType<T>()) { \
StoreAtomic(flag, flag->cur, sizeof(T)); \
}
if (false) {
}
ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(STORE_ATOMIC)
#undef STORE_ATOMIC
InvokeCallback(flag, primary_lock);
}
// Ensure that the lazily initialized fields of *flag have been initialized,
// and return &flag->locks->primary_mu.
absl::Mutex* InitFlagIfNecessary(CommandLineFlag* flag)
LOCK_RETURNED(flag->locks->primary_mu) {
absl::Mutex* mu;
if (!flag->inited.load(std::memory_order_acquire)) {
// Need to initialize lazily initialized fields.
ABSL_CONST_INIT static absl::Mutex init_lock(absl::kConstInit);
init_lock.Lock();
if (flag->locks == nullptr) { // Must initialize Mutexes for this flag.
flag->locks = new flags_internal::CommandLineFlagLocks;
}
mu = &flag->locks->primary_mu;
init_lock.Unlock();
mu->Lock();
if (!flag->retired &&
flag->def == nullptr) { // Need to initialize def and cur fields.
flag->def = (*flag->make_init_value)();
flag->cur = Clone(flag->op, flag->def);
UpdateCopy(flag, mu);
}
mu->Unlock();
flag->inited.store(true, std::memory_order_release);
} else { // All fields initialized; flag->locks is therefore safe to read.
mu = &flag->locks->primary_mu;
}
return mu;
}
// Return true iff flag value was changed via direct-access.
bool ChangedDirectly(CommandLineFlag* flag, const void* a, const void* b) {
if (!flag->IsAbseilFlag()) {
// Need to compare values for direct-access flags.
#define CHANGED_FOR_TYPE(T) \
if (flag->IsOfType<T>()) { \
return *reinterpret_cast<const T*>(a) != *reinterpret_cast<const T*>(b); \
}
CHANGED_FOR_TYPE(bool);
CHANGED_FOR_TYPE(int32_t);
CHANGED_FOR_TYPE(int64_t);
CHANGED_FOR_TYPE(uint64_t);
CHANGED_FOR_TYPE(double);
CHANGED_FOR_TYPE(std::string);
#undef CHANGED_FOR_TYPE
}
return false;
}
// Direct-access flags can be modified without going through the
// flag API. Detect such changes and updated the modified bit.
void UpdateModifiedBit(CommandLineFlag* flag) {
if (!flag->IsAbseilFlag()) {
absl::MutexLock l(InitFlagIfNecessary(flag));
if (!flag->modified && ChangedDirectly(flag, flag->cur, flag->def)) {
flag->modified = true;
}
}
}
bool Validate(CommandLineFlag*, const void*) {
return true;
}
std::string HelpText::GetHelpText() const {
if (help_function_) return help_function_();
if (help_message_) return help_message_;
return {};
}
const int64_t CommandLineFlag::kAtomicInit;
void CommandLineFlag::Read(void* dst,
const flags_internal::FlagOpFn dst_op) const {
absl::ReaderMutexLock l(
InitFlagIfNecessary(const_cast<CommandLineFlag*>(this)));
// `dst_op` is the unmarshaling operation corresponding to the declaration
// visibile at the call site. `op` is the Flag's defined unmarshalling
// operation. They must match for this operation to be well-defined.
if (ABSL_PREDICT_FALSE(dst_op != op)) {
ABSL_INTERNAL_LOG(
ERROR,
absl::StrCat("Flag '", name,
"' is defined as one type and declared as another"));
}
CopyConstruct(op, cur, dst);
}
void CommandLineFlag::Write(const void* src,
const flags_internal::FlagOpFn src_op) {
absl::Mutex* mu = InitFlagIfNecessary(this);
absl::MutexLock l(mu);
// `src_op` is the marshalling operation corresponding to the declaration
// visible at the call site. `op` is the Flag's defined marshalling operation.
// They must match for this operation to be well-defined.
if (ABSL_PREDICT_FALSE(src_op != op)) {
ABSL_INTERNAL_LOG(
ERROR,
absl::StrCat("Flag '", name,
"' is defined as one type and declared as another"));
}
if (ShouldValidateFlagValue(*this)) {
void* obj = Clone(op, src);
std::string ignored_error;
std::string src_as_str = Unparse(marshalling_op, src);
if (!Parse(marshalling_op, src_as_str, obj, &ignored_error) ||
!Validate(this, obj)) {
ABSL_INTERNAL_LOG(ERROR, absl::StrCat("Attempt to set flag '", name,
"' to invalid value ", src_as_str));
}
Delete(op, obj);
}
modified = true;
counter++;
Copy(op, src, cur);
UpdateCopy(this, mu);
}
absl::string_view CommandLineFlag::Typename() const {
// We do not store/report type in Abseil Flags, so that user do not rely on in
// at runtime
if (IsAbseilFlag() || IsRetired()) return "";
#define HANDLE_V1_BUILTIN_TYPE(t) \
if (IsOfType<t>()) { \
return #t; \
}
HANDLE_V1_BUILTIN_TYPE(bool);
HANDLE_V1_BUILTIN_TYPE(int32_t);
HANDLE_V1_BUILTIN_TYPE(int64_t);
HANDLE_V1_BUILTIN_TYPE(uint64_t);
HANDLE_V1_BUILTIN_TYPE(double);
#undef HANDLE_V1_BUILTIN_TYPE
if (IsOfType<std::string>()) {
return "string";
}
return "";
}
std::string CommandLineFlag::Filename() const {
return flags_internal::GetUsageConfig().normalize_filename(this->filename);
}
std::string CommandLineFlag::DefaultValue() const {
return Unparse(this->marshalling_op, this->def);
}
std::string CommandLineFlag::CurrentValue() const {
return Unparse(this->marshalling_op, this->cur);
}
void CommandLineFlag::SetCallback(
const flags_internal::FlagCallback mutation_callback) {
absl::Mutex* mu = InitFlagIfNecessary(this);
absl::MutexLock l(mu);
callback = mutation_callback;
InvokeCallback(this, mu);
}
// Attempts to parse supplied `value` string using parsing routine in the `flag`
// argument. If parsing is successful, it will try to validate that the parsed
// value is valid for the specified 'flag'. Finally this function stores the
// parsed value in 'dst' assuming it is a pointer to the flag's value type. In
// case if any error is encountered in either step, the error message is stored
// in 'err'
static bool TryParseLocked(CommandLineFlag* flag, void* dst,
absl::string_view value, std::string* err) {
void* tentative_value = Clone(flag->op, flag->def);
std::string parse_err;
if (!Parse(flag->marshalling_op, value, tentative_value, &parse_err)) {
auto type_name = flag->Typename();
absl::string_view err_sep = parse_err.empty() ? "" : "; ";
absl::string_view typename_sep = type_name.empty() ? "" : " ";
*err = absl::StrCat("Illegal value '", value, "' specified for",
typename_sep, type_name, " flag '", flag->Name(), "'",
err_sep, parse_err);
Delete(flag->op, tentative_value);
return false;
}
if (!Validate(flag, tentative_value)) {
*err = absl::StrCat("Failed validation of new value '",
Unparse(flag->marshalling_op, tentative_value),
"' for flag '", flag->Name(), "'");
Delete(flag->op, tentative_value);
return false;
}
flag->counter++;
Copy(flag->op, tentative_value, dst);
Delete(flag->op, tentative_value);
return true;
}
// Sets the value of the flag based on specified string `value`. If the flag
// was successfully set to new value, it returns true. Otherwise, sets `err`
// to indicate the error, leaves the flag unchanged, and returns false. There
// are three ways to set the flag's value:
// * Update the current flag value
// * Update the flag's default value
// * Update the current flag value if it was never set before
// The mode is selected based on 'set_mode' parameter.
bool CommandLineFlag::SetFromString(absl::string_view value,
FlagSettingMode set_mode,
ValueSource source, std::string* err) {
if (IsRetired()) return false;
UpdateModifiedBit(this);
absl::Mutex* mu = InitFlagIfNecessary(this);
absl::MutexLock l(mu);
switch (set_mode) {
case SET_FLAGS_VALUE: {
// set or modify the flag's value
if (!TryParseLocked(this, this->cur, value, err)) return false;
this->modified = true;
UpdateCopy(this, mu);
if (source == kCommandLine) {
this->on_command_line = true;
}
break;
}
case SET_FLAG_IF_DEFAULT: {
// set the flag's value, but only if it hasn't been set by someone else
if (!this->modified) {
if (!TryParseLocked(this, this->cur, value, err)) return false;
this->modified = true;
UpdateCopy(this, mu);
} else {
// TODO(rogeeff): review and fix this semantic. Currently we do not fail
// in this case if flag is modified. This is misleading since the flag's
// value is not updated even though we return true.
// *err = absl::StrCat(this->Name(), " is already set to ",
// CurrentValue(), "\n");
// return false;
return true;
}
break;
}
case SET_FLAGS_DEFAULT: {
// modify the flag's default-value
if (!TryParseLocked(this, this->def, value, err)) return false;
if (!this->modified) {
// Need to set both defvalue *and* current, in this case
Copy(this->op, this->def, this->cur);
UpdateCopy(this, mu);
}
break;
}
default: {
// unknown set_mode
assert(false);
return false;
}
}
return true;
}
} // namespace flags_internal
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
#define ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
#include <atomic>
#include "absl/base/macros.h"
#include "absl/flags/marshalling.h"
#include "absl/synchronization/mutex.h"
#include "absl/types/optional.h"
namespace absl {
namespace flags_internal {
// Type-specific operations, eg., parsing, copying, etc. are provided
// by function specific to that type with a signature matching FlagOpFn.
enum FlagOp {
kDelete,
kClone,
kCopy,
kCopyConstruct,
kSizeof,
kParse,
kUnparse
};
using FlagOpFn = void* (*)(FlagOp, const void*, void*);
using FlagMarshallingOpFn = void* (*)(FlagOp, const void*, void*, void*);
// Options that control SetCommandLineOptionWithMode.
enum FlagSettingMode {
// update the flag's value unconditionally (can call this multiple times).
SET_FLAGS_VALUE,
// update the flag's value, but *only if* it has not yet been updated
// with SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef".
SET_FLAG_IF_DEFAULT,
// set the flag's default value to this. If the flag has not been updated
// yet (via SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef")
// change the flag's current value to the new default value as well.
SET_FLAGS_DEFAULT
};
// Options that control SetFromString: Source of a value.
enum ValueSource {
// Flag is being set by value specified on a command line.
kCommandLine,
// Flag is being set by value specified in the code.
kProgrammaticChange,
};
// Signature for the help generation function used as an argument for the
// absl::Flag constructor.
using HelpGenFunc = std::string (*)();
// Signature for the function generating the initial flag value based (usually
// based on default value supplied in flag's definition)
using InitialValGenFunc = void* (*)();
// Signature for the mutation callback used by watched Flags
// The callback is noexcept.
// TODO(rogeeff): add noexcept after C++17 support is added.
using FlagCallback = void (*)();
extern const char kStrippedFlagHelp[];
// The per-type function
template <typename T>
void* FlagOps(FlagOp op, const void* v1, void* v2) {
switch (op) {
case kDelete:
delete static_cast<const T*>(v1);
return nullptr;
case kClone:
return new T(*static_cast<const T*>(v1));
case kCopy:
*static_cast<T*>(v2) = *static_cast<const T*>(v1);
return nullptr;
case kCopyConstruct:
new (v2) T(*static_cast<const T*>(v1));
return nullptr;
case kSizeof:
return reinterpret_cast<void*>(sizeof(T));
default:
return nullptr;
}
}
template <typename T>
void* FlagMarshallingOps(FlagOp op, const void* v1, void* v2, void* v3) {
switch (op) {
case kParse: {
// initialize the temporary instance of type T based on current value in
// destination (which is going to be flag's default value).
T temp(*static_cast<T*>(v2));
if (!absl::ParseFlag<T>(*static_cast<const absl::string_view*>(v1), &temp,
static_cast<std::string*>(v3))) {
return nullptr;
}
*static_cast<T*>(v2) = std::move(temp);
return v2;
}
case kUnparse:
*static_cast<std::string*>(v2) =
absl::UnparseFlag<T>(*static_cast<const T*>(v1));
return nullptr;
default:
return nullptr;
}
}
// Functions that invoke flag-type-specific operations.
inline void Delete(FlagOpFn op, const void* obj) {
op(flags_internal::kDelete, obj, nullptr);
}
inline void* Clone(FlagOpFn op, const void* obj) {
return op(flags_internal::kClone, obj, nullptr);
}
inline void Copy(FlagOpFn op, const void* src, void* dst) {
op(flags_internal::kCopy, src, dst);
}
inline void CopyConstruct(FlagOpFn op, const void* src, void* dst) {
op(flags_internal::kCopyConstruct, src, dst);
}
inline bool Parse(FlagMarshallingOpFn op, absl::string_view text, void* dst,
std::string* error) {
return op(flags_internal::kParse, &text, dst, error) != nullptr;
}
inline std::string Unparse(FlagMarshallingOpFn op, const void* val) {
std::string result;
op(flags_internal::kUnparse, val, &result, nullptr);
return result;
}
inline size_t Sizeof(FlagOpFn op) {
// This sequence of casts reverses the sequence from base::internal::FlagOps()
return static_cast<size_t>(reinterpret_cast<intptr_t>(
op(flags_internal::kSizeof, nullptr, nullptr)));
}
// The following struct contains the locks in a CommandLineFlag struct.
// They are in a separate struct that is lazily allocated to avoid problems
// with static initialization and to avoid multiple allocations.
struct CommandLineFlagLocks {
absl::Mutex primary_mu; // protects several fields in CommandLineFlag
absl::Mutex callback_mu; // used to serialize callbacks
};
// Holds either a pointer to help text or a function which produces it. This is
// needed for supporting both static initialization of Flags while supporting
// the legacy registration framework. We can't use absl::variant<const char*,
// const char*(*)()> since anybody passing 0 or nullptr in to a CommandLineFlag
// would find an ambiguity.
class HelpText {
public:
static constexpr HelpText FromFunctionPointer(const HelpGenFunc fn) {
return HelpText(fn, nullptr);
}
static constexpr HelpText FromStaticCString(const char* msg) {
return HelpText(nullptr, msg);
}
std::string GetHelpText() const;
HelpText() = delete;
HelpText(const HelpText&) = default;
HelpText(HelpText&&) = default;
private:
explicit constexpr HelpText(const HelpGenFunc fn, const char* msg)
: help_function_(fn), help_message_(msg) {}
HelpGenFunc help_function_;
const char* help_message_;
};
// Holds all information for a flag.
struct CommandLineFlag {
constexpr CommandLineFlag(
const char* name_arg, HelpText help_text, const char* filename_arg,
const flags_internal::FlagOpFn op_arg,
const flags_internal::FlagMarshallingOpFn marshalling_op_arg,
const flags_internal::InitialValGenFunc initial_value_gen,
const bool retired_arg, void* def_arg, void* cur_arg)
: name(name_arg),
help(help_text),
filename(filename_arg),
op(op_arg),
marshalling_op(marshalling_op_arg),
make_init_value(initial_value_gen),
retired(retired_arg),
inited(false),
modified(false),
on_command_line(false),
validator(nullptr),
callback(nullptr),
def(def_arg),
cur(cur_arg),
counter(0),
atomic(kAtomicInit),
locks(nullptr) {}
// Not copyable/assignable.
CommandLineFlag(const CommandLineFlag&) = delete;
CommandLineFlag& operator=(const CommandLineFlag&) = delete;
absl::string_view Name() const { return name; }
std::string Help() const { return help.GetHelpText(); }
bool IsRetired() const { return this->retired; }
bool IsSpecifiedOnCommandLine() const { return on_command_line; }
// Returns true iff this is a handle to an Abseil Flag.
bool IsAbseilFlag() const {
// Set to null for V1 flags
return this->make_init_value != nullptr;
}
absl::string_view Typename() const;
std::string Filename() const;
std::string DefaultValue() const;
std::string CurrentValue() const;
// Return true iff flag has type T.
template <typename T>
inline bool IsOfType() const {
return this->op == &flags_internal::FlagOps<T>;
}
// Attempts to retrieve the flag value. Returns value on success,
// absl::nullopt otherwise.
template <typename T>
absl::optional<T> Get() {
if (IsRetired() || flags_internal::FlagOps<T> != this->op)
return absl::nullopt;
T res;
Read(&res, flags_internal::FlagOps<T>);
return res;
}
void SetCallback(const flags_internal::FlagCallback mutation_callback);
// Sets the value of the flag based on specified std::string `value`. If the flag
// was successfully set to new value, it returns true. Otherwise, sets `error`
// to indicate the error, leaves the flag unchanged, and returns false. There
// are three ways to set the flag's value:
// * Update the current flag value
// * Update the flag's default value
// * Update the current flag value if it was never set before
// The mode is selected based on `set_mode` parameter.
bool SetFromString(absl::string_view value,
flags_internal::FlagSettingMode set_mode,
flags_internal::ValueSource source, std::string* error);
// Constant configuration for a particular flag.
private:
const char* const name;
const HelpText help;
const char* const filename;
public:
const FlagOpFn op; // Type-specific handler
const FlagMarshallingOpFn marshalling_op; // Marshalling ops handler
const InitialValGenFunc make_init_value; // Makes initial value for the flag
const bool retired; // Is the flag retired?
std::atomic<bool> inited; // fields have been lazily initialized
// Mutable state (guarded by locks->primary_mu).
bool modified; // Has flag value been modified?
bool on_command_line; // Specified on command line.
bool (*validator)(); // Validator function, or nullptr
FlagCallback callback; // Mutation callback, or nullptr
void* def; // Lazily initialized pointer to default value
void* cur; // Lazily initialized pointer to current value
int64_t counter; // Mutation counter
// For some types, a copy of the current value is kept in an atomically
// accessible field.
static const int64_t kAtomicInit = 0xababababababababll;
std::atomic<int64_t> atomic;
// Lazily initialized mutexes for this flag value. We cannot inline a
// SpinLock or Mutex here because those have non-constexpr constructors and
// so would prevent constant initialization of this type.
// TODO(rogeeff): fix it once Mutex has constexpr constructor
struct CommandLineFlagLocks* locks; // locks, laziliy allocated.
// copy construct new value of flag's type in a memory referenced by dst
// based on current flag's value
void Read(void* dst, const flags_internal::FlagOpFn dst_op) const;
// updates flag's value to *src (locked)
void Write(const void* src, const flags_internal::FlagOpFn src_op);
ABSL_DEPRECATED(
"temporary until FlagName call sites are migrated and validator API is "
"changed")
const char* NameAsCString() const { return name; }
private:
friend class FlagRegistry;
};
// Ensure that the lazily initialized fields of *flag have been initialized,
// and return &flag->locks->primary_mu.
absl::Mutex* InitFlagIfNecessary(CommandLineFlag* flag);
// Update any copy of the flag value that is stored in an atomic word.
// In addition if flag has a mutation callback this function invokes it. While
// callback is being invoked the primary flag's mutex is unlocked and it is
// re-locked back after call to callback is completed. Callback invocation is
// guarded by flag's secondary mutex instead which prevents concurrent callback
// invocation. Note that it is possible for other thread to grab the primary
// lock and update flag's value at any time during the callback invocation.
// This is by design. Callback can get a value of the flag if necessary, but it
// might be different from the value initiated the callback and it also can be
// different by the time the callback invocation is completed.
// Requires that *primary_lock be held in exclusive mode; it may be released
// and reacquired by the implementation.
void UpdateCopy(CommandLineFlag* flag, absl::Mutex* primary_lock);
// Return true iff flag value was changed via direct-access.
bool ChangedDirectly(CommandLineFlag* flag, const void* a, const void* b);
// Direct-access flags can be modified without going through the
// flag API. Detect such changes and updated the modified bit.
void UpdateModifiedBit(CommandLineFlag* flag);
// Invoke the flag validators for old flags.
// TODO(rogeeff): implement proper validators for Abseil Flags
bool Validate(CommandLineFlag* flag, const void* value);
// This macro is the "source of truth" for the list of supported flag types we
// expect to perform lock free operations on. Specifically it generates code,
// a one argument macro operating on a type, supplied as a macro argument, for
// each type in the list.
#define ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(A) \
A(bool) \
A(short) \
A(unsigned short) \
A(int) \
A(unsigned int) \
A(long) \
A(unsigned long) \
A(long long) \
A(unsigned long long) \
A(double) \
A(float)
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/commandlineflag.h"
#include "gtest/gtest.h"
#include "absl/flags/flag.h"
#include "absl/flags/internal/registry.h"
#include "absl/memory/memory.h"
#include "absl/strings/match.h"
#include "absl/strings/str_cat.h"
ABSL_FLAG(int, int_flag, 201, "int_flag help");
ABSL_FLAG(std::string, string_flag, "dflt",
absl::StrCat("string_flag", " help"));
ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
namespace {
namespace flags = absl::flags_internal;
class CommandLineFlagTest : public testing::Test {
protected:
void SetUp() override { flag_saver_ = absl::make_unique<flags::FlagSaver>(); }
void TearDown() override { flag_saver_.reset(); }
private:
std::unique_ptr<flags::FlagSaver> flag_saver_;
};
TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
auto* flag_01 = flags::FindCommandLineFlag("int_flag");
ASSERT_TRUE(flag_01);
EXPECT_EQ(flag_01->Name(), "int_flag");
EXPECT_EQ(flag_01->Help(), "int_flag help");
EXPECT_EQ(flag_01->Typename(), "");
EXPECT_TRUE(!flag_01->IsRetired());
EXPECT_TRUE(flag_01->IsOfType<int>());
EXPECT_TRUE(absl::EndsWith(
flag_01->Filename(),
"absl/flags/internal/commandlineflag_test.cc"));
auto* flag_02 = flags::FindCommandLineFlag("string_flag");
ASSERT_TRUE(flag_02);
EXPECT_EQ(flag_02->Name(), "string_flag");
EXPECT_EQ(flag_02->Help(), "string_flag help");
EXPECT_EQ(flag_02->Typename(), "");
EXPECT_TRUE(!flag_02->IsRetired());
EXPECT_TRUE(flag_02->IsOfType<std::string>());
EXPECT_TRUE(absl::EndsWith(
flag_02->Filename(),
"absl/flags/internal/commandlineflag_test.cc"));
auto* flag_03 = flags::FindRetiredFlag("bool_retired_flag");
ASSERT_TRUE(flag_03);
EXPECT_EQ(flag_03->Name(), "bool_retired_flag");
EXPECT_EQ(flag_03->Help(), "");
EXPECT_EQ(flag_03->Typename(), "");
EXPECT_TRUE(flag_03->IsRetired());
EXPECT_TRUE(flag_03->IsOfType<bool>());
EXPECT_EQ(flag_03->Filename(), "RETIRED");
}
// --------------------------------------------------------------------
TEST_F(CommandLineFlagTest, TestValueAccessMethods) {
absl::SetFlag(&FLAGS_int_flag, 301);
auto* flag_01 = flags::FindCommandLineFlag("int_flag");
ASSERT_TRUE(flag_01);
EXPECT_EQ(flag_01->CurrentValue(), "301");
EXPECT_EQ(flag_01->DefaultValue(), "201");
absl::SetFlag(&FLAGS_string_flag, "new_str_value");
auto* flag_02 = flags::FindCommandLineFlag("string_flag");
ASSERT_TRUE(flag_02);
EXPECT_EQ(flag_02->CurrentValue(), "new_str_value");
EXPECT_EQ(flag_02->DefaultValue(), "dflt");
}
// --------------------------------------------------------------------
TEST_F(CommandLineFlagTest, TestSetFromStringCurrentValue) {
std::string err;
auto* flag_01 = flags::FindCommandLineFlag("int_flag");
EXPECT_FALSE(flag_01->on_command_line);
EXPECT_TRUE(flag_01->SetFromString("11", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
EXPECT_FALSE(flag_01->on_command_line);
EXPECT_TRUE(flag_01->SetFromString("-123", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
EXPECT_FALSE(flag_01->on_command_line);
EXPECT_TRUE(!flag_01->SetFromString("xyz", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
EXPECT_EQ(err, "Illegal value 'xyz' specified for flag 'int_flag'");
EXPECT_FALSE(flag_01->on_command_line);
EXPECT_TRUE(!flag_01->SetFromString("A1", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
EXPECT_EQ(err, "Illegal value 'A1' specified for flag 'int_flag'");
EXPECT_FALSE(flag_01->on_command_line);
EXPECT_TRUE(flag_01->SetFromString("0x10", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 16);
EXPECT_FALSE(flag_01->on_command_line);
EXPECT_TRUE(flag_01->SetFromString("011", flags::SET_FLAGS_VALUE,
flags::kCommandLine, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
EXPECT_TRUE(flag_01->on_command_line);
EXPECT_TRUE(!flag_01->SetFromString("", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(err, "Illegal value '' specified for flag 'int_flag'");
auto* flag_02 = flags::FindCommandLineFlag("string_flag");
EXPECT_TRUE(flag_02->SetFromString("xyz", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "xyz");
EXPECT_TRUE(flag_02->SetFromString("", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "");
}
// --------------------------------------------------------------------
TEST_F(CommandLineFlagTest, TestSetFromStringDefaultValue) {
std::string err;
auto* flag_01 = flags::FindCommandLineFlag("int_flag");
EXPECT_TRUE(flag_01->SetFromString("111", flags::SET_FLAGS_DEFAULT,
flags::kProgrammaticChange, &err));
EXPECT_EQ(flag_01->DefaultValue(), "111");
auto* flag_02 = flags::FindCommandLineFlag("string_flag");
EXPECT_TRUE(flag_02->SetFromString("abc", flags::SET_FLAGS_DEFAULT,
flags::kProgrammaticChange, &err));
EXPECT_EQ(flag_02->DefaultValue(), "abc");
}
// --------------------------------------------------------------------
TEST_F(CommandLineFlagTest, TestSetFromStringIfDefault) {
std::string err;
auto* flag_01 = flags::FindCommandLineFlag("int_flag");
EXPECT_TRUE(flag_01->SetFromString("22", flags::SET_FLAG_IF_DEFAULT,
flags::kProgrammaticChange, &err))
<< err;
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
EXPECT_TRUE(flag_01->SetFromString("33", flags::SET_FLAG_IF_DEFAULT,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
// EXPECT_EQ(err, "ERROR: int_flag is already set to 22");
// Reset back to default value
EXPECT_TRUE(flag_01->SetFromString("201", flags::SET_FLAGS_VALUE,
flags::kProgrammaticChange, &err));
EXPECT_TRUE(flag_01->SetFromString("33", flags::SET_FLAG_IF_DEFAULT,
flags::kProgrammaticChange, &err));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 201);
// EXPECT_EQ(err, "ERROR: int_flag is already set to 201");
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_FLAG_H_
#define ABSL_FLAGS_INTERNAL_FLAG_H_
#include "absl/flags/internal/commandlineflag.h"
#include "absl/flags/internal/registry.h"
namespace absl {
namespace flags_internal {
// This is "unspecified" implementation of absl::Flag<T> type.
template <typename T>
class Flag {
public:
constexpr Flag(const char* name, const flags_internal::HelpGenFunc help_gen,
const char* filename,
const flags_internal::FlagMarshallingOpFn marshalling_op,
const flags_internal::InitialValGenFunc initial_value_gen)
: internal(name, flags_internal::HelpText::FromFunctionPointer(help_gen),
filename, &flags_internal::FlagOps<T>, marshalling_op,
initial_value_gen,
/*retired_arg=*/false, /*def_arg=*/nullptr,
/*cur_arg=*/nullptr) {}
// Not copyable/assignable.
Flag(const Flag<T>&) = delete;
Flag<T>& operator=(const Flag<T>&) = delete;
absl::string_view Name() const { return internal.Name(); }
std::string Help() const { return internal.Help(); }
std::string Filename() const { return internal.Filename(); }
absl::flags_internal::CommandLineFlag internal;
void SetCallback(const flags_internal::FlagCallback mutation_callback) {
internal.SetCallback(mutation_callback);
}
private:
// TODO(rogeeff): add these validations once UnparseFlag invocation is fixed
// for built-in types and when we cleanup existing code from operating on
// forward declared types.
// auto IsCopyConstructible(const T& v) -> decltype(T(v));
// auto HasAbslParseFlag(absl::string_view in, T* dst, std::string* err)
// -> decltype(AbslParseFlag(in, dst, GlobalStringADLGuard(err)));
// auto HasAbslUnparseFlag(const T& v) -> decltype(AbslUnparseFlag(v));
};
// This class facilitates Flag object registration and tail expression-based
// flag definition, for example:
// ABSL_FLAG(int, foo, 42, "Foo help").OnUpdate(NotifyFooWatcher);
template <typename T, bool do_register>
class FlagRegistrar {
public:
explicit FlagRegistrar(Flag<T>* flag) : flag_(flag) {
if (do_register) flags_internal::RegisterCommandLineFlag(&flag_->internal);
}
FlagRegistrar& OnUpdate(flags_internal::FlagCallback cb) && {
flag_->SetCallback(cb);
return *this;
}
// Make the registrar "die" gracefully as a bool on a line where registration
// happens. Registrar objects are intended to live only as temporary.
operator bool() const { return true; } // NOLINT
private:
Flag<T>* flag_; // Flag being registered (not owned).
};
// This struct and corresponding overload to MakeDefaultValue are used to
// facilitate usage of {} as default value in ABSL_FLAG macro.
struct EmptyBraces {};
template <typename T>
T* MakeFromDefaultValue(T t) {
return new T(std::move(t));
}
template <typename T>
T* MakeFromDefaultValue(EmptyBraces) {
return new T;
}
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_FLAG_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_PARSE_H_
#define ABSL_FLAGS_INTERNAL_PARSE_H_
#include <string>
#include <vector>
#include "absl/flags/declare.h"
ABSL_DECLARE_FLAG(std::vector<std::string>, flagfile);
ABSL_DECLARE_FLAG(std::vector<std::string>, fromenv);
ABSL_DECLARE_FLAG(std::vector<std::string>, tryfromenv);
ABSL_DECLARE_FLAG(std::vector<std::string>, undefok);
namespace absl {
namespace flags_internal {
enum class ArgvListAction { kRemoveParsedArgs, kKeepParsedArgs };
enum class UsageFlagsAction { kHandleUsage, kIgnoreUsage };
enum class OnUndefinedFlag {
kIgnoreUndefined,
kReportUndefined,
kAbortIfUndefined
};
std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
ArgvListAction arg_list_act,
UsageFlagsAction usage_flag_act,
OnUndefinedFlag on_undef_flag);
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_PARSE_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
#define ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
#include "absl/strings/match.h"
#include "absl/strings/string_view.h"
namespace absl {
namespace flags_internal {
// A portable interface that returns the basename of the filename passed as an
// argument. It is similar to basename(3)
// <https://linux.die.net/man/3/basename>.
// For example:
// flags_internal::Basename("a/b/prog/file.cc")
// returns "file.cc"
// flags_internal::Basename("file.cc")
// returns "file.cc"
inline absl::string_view Basename(absl::string_view filename) {
auto last_slash_pos = filename.find_last_of("/\\");
return last_slash_pos == absl::string_view::npos
? filename
: filename.substr(last_slash_pos + 1);
}
// A portable interface that returns the directory name of the filename
// passed as an argument, including the trailing slash.
// Returns the empty string if a slash is not found in the input file name.
// For example:
// flags_internal::Package("a/b/prog/file.cc")
// returns "a/b/prog/"
// flags_internal::Package("file.cc")
// returns ""
inline absl::string_view Package(absl::string_view filename) {
auto last_slash_pos = filename.find_last_of("/\\");
return last_slash_pos == absl::string_view::npos
? absl::string_view()
: filename.substr(0, last_slash_pos + 1);
}
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_PATH_UTIL_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/path_util.h"
#include "gtest/gtest.h"
namespace {
namespace flags = absl::flags_internal;
TEST(FlagsPathUtilTest, TestBasename) {
EXPECT_EQ(flags::Basename(""), "");
EXPECT_EQ(flags::Basename("a.cc"), "a.cc");
EXPECT_EQ(flags::Basename("dir/a.cc"), "a.cc");
EXPECT_EQ(flags::Basename("dir1/dir2/a.cc"), "a.cc");
EXPECT_EQ(flags::Basename("../dir1/dir2/a.cc"), "a.cc");
EXPECT_EQ(flags::Basename("/dir1/dir2/a.cc"), "a.cc");
EXPECT_EQ(flags::Basename("/dir1/dir2/../dir3/a.cc"), "a.cc");
}
// --------------------------------------------------------------------
TEST(FlagsPathUtilTest, TestPackage) {
EXPECT_EQ(flags::Package(""), "");
EXPECT_EQ(flags::Package("a.cc"), "");
EXPECT_EQ(flags::Package("dir/a.cc"), "dir/");
EXPECT_EQ(flags::Package("dir1/dir2/a.cc"), "dir1/dir2/");
EXPECT_EQ(flags::Package("../dir1/dir2/a.cc"), "../dir1/dir2/");
EXPECT_EQ(flags::Package("/dir1/dir2/a.cc"), "/dir1/dir2/");
EXPECT_EQ(flags::Package("/dir1/dir2/../dir3/a.cc"), "/dir1/dir2/../dir3/");
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/program_name.h"
#include <string>
#include "absl/flags/internal/path_util.h"
#include "absl/synchronization/mutex.h"
namespace absl {
namespace flags_internal {
ABSL_CONST_INIT static absl::Mutex program_name_guard(absl::kConstInit);
ABSL_CONST_INIT static std::string* program_name
GUARDED_BY(program_name_guard) = nullptr;
std::string ProgramInvocationName() {
absl::MutexLock l(&program_name_guard);
return program_name ? *program_name : "UNKNOWN";
}
std::string ShortProgramInvocationName() {
absl::MutexLock l(&program_name_guard);
return program_name ? std::string(flags_internal::Basename(*program_name))
: "UNKNOWN";
}
void SetProgramInvocationName(absl::string_view prog_name_str) {
absl::MutexLock l(&program_name_guard);
if (!program_name)
program_name = new std::string(prog_name_str);
else
program_name->assign(prog_name_str.data(), prog_name_str.size());
}
} // namespace flags_internal
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
#define ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
#include <string>
#include "absl/strings/string_view.h"
// --------------------------------------------------------------------
// Program name
namespace absl {
namespace flags_internal {
// Returns program invocation name or "UNKNOWN" if `SetProgramInvocationName()`
// is never called. At the moment this is always set to argv[0] as part of
// library initialization.
std::string ProgramInvocationName();
// Returns base name for program invocation name. For example, if
// ProgramInvocationName() == "a/b/mybinary"
// then
// ShortProgramInvocationName() == "mybinary"
std::string ShortProgramInvocationName();
// Sets program invocation name to a new value. Should only be called once
// during program initialization, before any threads are spawned.
void SetProgramInvocationName(absl::string_view prog_name_str);
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/program_name.h"
#include "gtest/gtest.h"
#include "absl/strings/match.h"
namespace {
namespace flags = absl::flags_internal;
TEST(FlagsPathUtilTest, TestInitialProgamName) {
flags::SetProgramInvocationName("absl/flags/program_name_test");
std::string program_name = flags::ProgramInvocationName();
for (char& c : program_name)
if (c == '\\') c = '/';
#if !defined(__wasm__) && !defined(__asmjs__)
const std::string expect_name = "absl/flags/program_name_test";
const std::string expect_basename = "program_name_test";
#else
// For targets that generate javascript or webassembly the invocation name
// has the special value below.
const std::string expect_name = "this.program";
const std::string expect_basename = "this.program";
#endif
EXPECT_TRUE(absl::EndsWith(program_name, expect_name)) << program_name;
EXPECT_EQ(flags::ShortProgramInvocationName(), expect_basename);
}
TEST(FlagsPathUtilTest, TestProgamNameInterfaces) {
flags::SetProgramInvocationName("a/my_test");
EXPECT_EQ(flags::ProgramInvocationName(), "a/my_test");
EXPECT_EQ(flags::ShortProgramInvocationName(), "my_test");
absl::string_view not_null_terminated("absl/aaa/bbb");
not_null_terminated = not_null_terminated.substr(1, 10);
flags::SetProgramInvocationName(not_null_terminated);
EXPECT_EQ(flags::ProgramInvocationName(), "bsl/aaa/bb");
EXPECT_EQ(flags::ShortProgramInvocationName(), "bb");
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/registry.h"
#include "absl/base/call_once.h"
#include "absl/base/dynamic_annotations.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/flags/config.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "absl/synchronization/mutex.h"
// --------------------------------------------------------------------
// FlagRegistry implementation
// A FlagRegistry holds all flag objects indexed
// by their names so that if you know a flag's name you can access or
// set it.
namespace absl {
namespace flags_internal {
namespace {
void DestroyFlag(CommandLineFlag* flag) NO_THREAD_SAFETY_ANALYSIS {
// Values are heap allocated for retired and Abseil Flags.
if (flag->IsRetired() || flag->IsAbseilFlag()) {
if (flag->cur) Delete(flag->op, flag->cur);
if (flag->def) Delete(flag->op, flag->def);
}
delete flag->locks;
// CommandLineFlag handle object is heap allocated for non Abseil Flags.
if (!flag->IsAbseilFlag()) {
delete flag;
}
}
// --------------------------------------------------------------------
// FlagRegistry
// A FlagRegistry singleton object holds all flag objects indexed
// by their names so that if you know a flag's name (as a C
// string), you can access or set it. If the function is named
// FooLocked(), you must own the registry lock before calling
// the function; otherwise, you should *not* hold the lock, and
// the function will acquire it itself if needed.
// --------------------------------------------------------------------
// A map from flag pointer to CommandLineFlag*. Used when registering
// validators.
class FlagPtrMap {
public:
void Register(CommandLineFlag* flag) {
auto& vec = buckets_[BucketForFlag(flag->cur)];
if (vec.size() == vec.capacity()) {
// Bypass default 2x growth factor with 1.25 so we have fuller vectors.
// This saves 4% memory compared to default growth.
vec.reserve(vec.size() * 1.25 + 0.5);
}
vec.push_back(flag);
}
CommandLineFlag* FindByPtr(const void* flag_ptr) {
const auto& flag_vector = buckets_[BucketForFlag(flag_ptr)];
for (CommandLineFlag* entry : flag_vector) {
if (entry->cur == flag_ptr) {
return entry;
}
}
return nullptr;
}
private:
// Instead of std::map, we use a custom hash table where each bucket stores
// flags in a vector. This reduces memory usage 40% of the memory that would
// have been used by std::map.
//
// kNumBuckets was picked as a large enough prime. As of writing this code, a
// typical large binary has ~8k (old-style) flags, and this would gives
// buckets with roughly 50 elements each.
//
// Note that reads to this hash table are rare: exactly as many as we have
// flags with validators. As of writing, a typical binary only registers 52
// validated flags.
static constexpr size_t kNumBuckets = 163;
std::vector<CommandLineFlag*> buckets_[kNumBuckets];
static int BucketForFlag(const void* ptr) {
// Modulo a prime is good enough here. On a real program, bucket size stddev
// after registering 8k flags is ~5 (mean size at 51).
return reinterpret_cast<uintptr_t>(ptr) % kNumBuckets;
}
};
constexpr size_t FlagPtrMap::kNumBuckets;
} // namespace
class FlagRegistry {
public:
FlagRegistry() = default;
~FlagRegistry() {
for (auto& p : flags_) {
DestroyFlag(p.second);
}
}
// Store a flag in this registry. Takes ownership of *flag.
// If ptr is non-null, the flag can later be found by calling
// FindFlagViaPtrLocked(ptr).
void RegisterFlag(CommandLineFlag* flag, const void* ptr);
void Lock() EXCLUSIVE_LOCK_FUNCTION(lock_) { lock_.Lock(); }
void Unlock() UNLOCK_FUNCTION(lock_) { lock_.Unlock(); }
// Returns the flag object for the specified name, or nullptr if not found.
// Will emit a warning if a 'retired' flag is specified.
CommandLineFlag* FindFlagLocked(absl::string_view name);
// Returns the retired flag object for the specified name, or nullptr if not
// found or not retired. Does not emit a warning.
CommandLineFlag* FindRetiredFlagLocked(absl::string_view name);
// Returns the flag object whose current-value is stored at flag_ptr.
CommandLineFlag* FindFlagViaPtrLocked(const void* flag_ptr);
static FlagRegistry* GlobalRegistry(); // returns a singleton registry
private:
friend class FlagSaverImpl; // reads all the flags in order to copy them
friend void ForEachFlagUnlocked(
std::function<void(CommandLineFlag*)> visitor);
// The map from name to flag, for FindFlagLocked().
using FlagMap = std::map<absl::string_view, CommandLineFlag*>;
using FlagIterator = FlagMap::iterator;
using FlagConstIterator = FlagMap::const_iterator;
FlagMap flags_;
FlagPtrMap flag_ptr_map_;
static FlagRegistry* global_registry_; // a singleton registry
static absl::once_flag global_registry_once_;
static void InitGlobalRegistry();
absl::Mutex lock_;
// Disallow
FlagRegistry(const FlagRegistry&);
FlagRegistry& operator=(const FlagRegistry&);
};
// Get the singleton FlagRegistry object
FlagRegistry* FlagRegistry::global_registry_ = nullptr;
absl::once_flag FlagRegistry::global_registry_once_;
void FlagRegistry::InitGlobalRegistry() { global_registry_ = new FlagRegistry; }
FlagRegistry* FlagRegistry::GlobalRegistry() {
absl::call_once(global_registry_once_, &InitGlobalRegistry);
return global_registry_;
}
namespace {
class FlagRegistryLock {
public:
explicit FlagRegistryLock(FlagRegistry* fr) : fr_(fr) { fr_->Lock(); }
~FlagRegistryLock() { fr_->Unlock(); }
private:
FlagRegistry* const fr_;
};
} // namespace
void FlagRegistry::RegisterFlag(CommandLineFlag* flag, const void* ptr) {
FlagRegistryLock registry_lock(this);
std::pair<FlagIterator, bool> ins =
flags_.insert(FlagMap::value_type(flag->Name(), flag));
if (ins.second == false) { // means the name was already in the map
CommandLineFlag* old_flag = ins.first->second;
if (flag->IsRetired() != old_flag->IsRetired()) {
// All registrations must agree on the 'retired' flag.
flags_internal::ReportUsageError(
absl::StrCat(
"Retired flag '", flag->Name(),
"' was defined normally in file '",
(flag->IsRetired() ? old_flag->Filename() : flag->Filename()),
"'."),
true);
} else if (flag->op != old_flag->op) {
flags_internal::ReportUsageError(
absl::StrCat("Flag '", flag->Name(),
"' was defined more than once but with "
"differing types. Defined in files '",
old_flag->Filename(), "' and '", flag->Filename(),
"' with types '", old_flag->Typename(), "' and '",
flag->Typename(), "', respectively."),
true);
} else if (old_flag->IsRetired()) {
// Retired definitions are idempotent. Just keep the old one.
DestroyFlag(flag);
return;
} else if (old_flag->Filename() != flag->Filename()) {
flags_internal::ReportUsageError(
absl::StrCat("Flag '", flag->Name(),
"' was defined more than once (in files '",
old_flag->Filename(), "' and '", flag->Filename(),
"')."),
true);
} else {
flags_internal::ReportUsageError(
absl::StrCat(
"Something wrong with flag '", flag->Name(), "' in file '",
flag->Filename(), "'. One possibility: file '", flag->Filename(),
"' is being linked both statically and dynamically into this "
"executable. e.g. some files listed as srcs to a test and also "
"listed as srcs of some shared lib deps of the same test."),
true);
}
// All cases above are fatal, except for the retired flags.
std::exit(1);
}
if (ptr != nullptr) {
// This must be the first time we're seeing this flag.
flag_ptr_map_.Register(flag);
}
}
CommandLineFlag* FlagRegistry::FindFlagLocked(absl::string_view name) {
FlagConstIterator i = flags_.find(name);
if (i == flags_.end()) {
return nullptr;
}
if (i->second->IsRetired()) {
flags_internal::ReportUsageError(
absl::StrCat("Accessing retired flag '", name, "'"), false);
}
return i->second;
}
CommandLineFlag* FlagRegistry::FindRetiredFlagLocked(absl::string_view name) {
FlagConstIterator i = flags_.find(name);
if (i == flags_.end() || !i->second->IsRetired()) {
return nullptr;
}
return i->second;
}
CommandLineFlag* FlagRegistry::FindFlagViaPtrLocked(const void* flag_ptr) {
return flag_ptr_map_.FindByPtr(flag_ptr);
}
// --------------------------------------------------------------------
// FlagSaver
// FlagSaverImpl
// This class stores the states of all flags at construct time,
// and restores all flags to that state at destruct time.
// Its major implementation challenge is that it never modifies
// pointers in the 'main' registry, so global FLAG_* vars always
// point to the right place.
// --------------------------------------------------------------------
class FlagSaverImpl {
public:
// Constructs an empty FlagSaverImpl object.
FlagSaverImpl() {}
~FlagSaverImpl() {
// reclaim memory from each of our CommandLineFlags
for (const SavedFlag& src : backup_registry_) {
Delete(src.op, src.current);
Delete(src.op, src.default_value);
}
}
// Saves the flag states from the flag registry into this object.
// It's an error to call this more than once.
// Must be called when the registry mutex is not held.
void SaveFromRegistry() {
assert(backup_registry_.empty()); // call only once!
SavedFlag saved;
flags_internal::ForEachFlag([&](flags_internal::CommandLineFlag* flag) {
if (flag->IsRetired()) return;
saved.name = flag->Name();
saved.op = flag->op;
saved.marshalling_op = flag->marshalling_op;
{
absl::MutexLock l(InitFlagIfNecessary(flag));
saved.validator = flag->validator;
saved.modified = flag->modified;
saved.on_command_line = flag->IsSpecifiedOnCommandLine();
saved.current = Clone(saved.op, flag->cur);
saved.default_value = Clone(saved.op, flag->def);
saved.counter = flag->counter;
}
backup_registry_.push_back(saved);
});
}
// Restores the saved flag states into the flag registry. We
// assume no flags were added or deleted from the registry since
// the SaveFromRegistry; if they were, that's trouble! Must be
// called when the registry mutex is not held.
void RestoreToRegistry() {
FlagRegistry* const global_registry = FlagRegistry::GlobalRegistry();
FlagRegistryLock frl(global_registry);
for (const SavedFlag& src : backup_registry_) {
CommandLineFlag* flag = global_registry->FindFlagLocked(src.name);
// If null, flag got deleted from registry.
if (!flag) continue;
bool restored = false;
{
absl::Mutex* mu = InitFlagIfNecessary(flag);
absl::MutexLock l(mu);
flag->validator = src.validator;
flag->modified = src.modified;
flag->on_command_line = src.on_command_line;
if (flag->counter != src.counter ||
ChangedDirectly(flag, src.default_value, flag->def)) {
flag->counter++;
Copy(src.op, src.default_value, flag->def);
}
if (flag->counter != src.counter ||
ChangedDirectly(flag, src.current, flag->cur)) {
restored = true;
flag->counter++;
Copy(src.op, src.current, flag->cur);
UpdateCopy(flag, mu);
// Revalidate the flag because the validator might store state based
// on the flag's value, which just changed due to the restore.
// Failing validation is ignored because it's assumed that the flag
// was valid previously and there's little that can be done about it
// here, anyway.
Validate(flag, flag->cur);
}
}
// Log statements must be done when no flag lock is held.
if (restored) {
ABSL_INTERNAL_LOG(
INFO, absl::StrCat("Restore saved value of ", flag->Name(), ": ",
Unparse(src.marshalling_op, src.current)));
}
}
}
private:
struct SavedFlag {
absl::string_view name;
FlagOpFn op;
FlagMarshallingOpFn marshalling_op;
int64_t counter;
bool modified;
bool on_command_line;
bool (*validator)();
const void* current; // nullptr after restore
const void* default_value; // nullptr after restore
};
std::vector<SavedFlag> backup_registry_;
FlagSaverImpl(const FlagSaverImpl&); // no copying!
void operator=(const FlagSaverImpl&);
};
FlagSaver::FlagSaver() : impl_(new FlagSaverImpl()) {
impl_->SaveFromRegistry();
}
void FlagSaver::Ignore() {
delete impl_;
impl_ = nullptr;
}
FlagSaver::~FlagSaver() {
if (!impl_) return;
impl_->RestoreToRegistry();
delete impl_;
}
// --------------------------------------------------------------------
// GetAllFlags()
// The main way the FlagRegistry class exposes its data. This
// returns, as strings, all the info about all the flags in
// the main registry, sorted first by filename they are defined
// in, and then by flagname.
// --------------------------------------------------------------------
struct FilenameFlagnameLess {
bool operator()(const CommandLineFlagInfo& a,
const CommandLineFlagInfo& b) const {
int cmp = absl::string_view(a.filename).compare(b.filename);
if (cmp != 0) return cmp < 0;
return a.name < b.name;
}
};
void FillCommandLineFlagInfo(CommandLineFlag* flag,
CommandLineFlagInfo* result) {
result->name = std::string(flag->Name());
result->type = std::string(flag->Typename());
result->description = flag->Help();
result->filename = flag->Filename();
UpdateModifiedBit(flag);
absl::MutexLock l(InitFlagIfNecessary(flag));
result->current_value = flag->CurrentValue();
result->default_value = flag->DefaultValue();
result->is_default = !flag->modified;
result->has_validator_fn = (flag->validator != nullptr);
result->flag_ptr = flag->IsAbseilFlag() ? nullptr : flag->cur;
}
// --------------------------------------------------------------------
CommandLineFlag* FindCommandLineFlag(absl::string_view name) {
if (name.empty()) return nullptr;
FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
FlagRegistryLock frl(registry);
return registry->FindFlagLocked(name);
}
CommandLineFlag* FindCommandLineV1Flag(const void* flag_ptr) {
FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
FlagRegistryLock frl(registry);
return registry->FindFlagViaPtrLocked(flag_ptr);
}
CommandLineFlag* FindRetiredFlag(absl::string_view name) {
FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
FlagRegistryLock frl(registry);
return registry->FindRetiredFlagLocked(name);
}
// --------------------------------------------------------------------
void ForEachFlagUnlocked(std::function<void(CommandLineFlag*)> visitor) {
FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
for (FlagRegistry::FlagConstIterator i = registry->flags_.begin();
i != registry->flags_.end(); ++i) {
visitor(i->second);
}
}
void ForEachFlag(std::function<void(CommandLineFlag*)> visitor) {
FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
FlagRegistryLock frl(registry);
ForEachFlagUnlocked(visitor);
}
// --------------------------------------------------------------------
void GetAllFlags(std::vector<CommandLineFlagInfo>* OUTPUT) {
flags_internal::ForEachFlag([&](CommandLineFlag* flag) {
if (flag->IsRetired()) return;
CommandLineFlagInfo fi;
FillCommandLineFlagInfo(flag, &fi);
OUTPUT->push_back(fi);
});
// Now sort the flags, first by filename they occur in, then alphabetically
std::sort(OUTPUT->begin(), OUTPUT->end(), FilenameFlagnameLess());
}
// --------------------------------------------------------------------
bool RegisterCommandLineFlag(CommandLineFlag* flag, const void* ptr) {
FlagRegistry::GlobalRegistry()->RegisterFlag(flag, ptr);
return true;
}
// --------------------------------------------------------------------
bool Retire(FlagOpFn ops, FlagMarshallingOpFn marshalling_ops,
const char* name) {
auto* flag = new CommandLineFlag(
name,
/*help_text=*/absl::flags_internal::HelpText::FromStaticCString(nullptr),
/*filename_arg=*/"RETIRED", ops, marshalling_ops,
/*initial_value_gen=*/nullptr,
/*retired_arg=*/true, nullptr, nullptr);
FlagRegistry::GlobalRegistry()->RegisterFlag(flag, nullptr);
return true;
}
// --------------------------------------------------------------------
bool IsRetiredFlag(absl::string_view name, bool* type_is_bool) {
assert(!name.empty());
CommandLineFlag* flag = flags_internal::FindRetiredFlag(name);
if (flag == nullptr) {
return false;
}
assert(type_is_bool);
*type_is_bool = flag->IsOfType<bool>();
return true;
}
} // namespace flags_internal
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_REGISTRY_H_
#define ABSL_FLAGS_INTERNAL_REGISTRY_H_
#include <functional>
#include <map>
#include <string>
#include "absl/base/macros.h"
#include "absl/flags/internal/commandlineflag.h"
// --------------------------------------------------------------------
// Global flags registry API.
namespace absl {
namespace flags_internal {
// CommandLineFlagInfo holds all information for a flag.
struct CommandLineFlagInfo {
std::string name; // the name of the flag
std::string type; // DO NOT use. Use flag->IsOfType<T>() instead.
std::string description; // the "help text" associated with the flag
std::string current_value; // the current value, as a std::string
std::string default_value; // the default value, as a std::string
std::string filename; // 'cleaned' version of filename holding the flag
bool has_validator_fn; // true if RegisterFlagValidator called on this flag
bool is_default; // true if the flag has the default value and
// has not been set explicitly from the cmdline
// or via SetCommandLineOption.
// nullptr for ABSL_FLAG. A pointer to the flag's current value
// otherwise. E.g., for DEFINE_int32(foo, ...), flag_ptr will be
// &FLAGS_foo.
const void* flag_ptr;
};
//-----------------------------------------------------------------------------
void FillCommandLineFlagInfo(CommandLineFlag* flag,
CommandLineFlagInfo* result);
//-----------------------------------------------------------------------------
CommandLineFlag* FindCommandLineFlag(absl::string_view name);
CommandLineFlag* FindCommandLineV1Flag(const void* flag_ptr);
CommandLineFlag* FindRetiredFlag(absl::string_view name);
// Executes specified visitor for each non-retired flag in the registry.
// Requires the caller hold the registry lock.
void ForEachFlagUnlocked(std::function<void(CommandLineFlag*)> visitor);
// Executes specified visitor for each non-retired flag in the registry. While
// callback are executed, the registry is locked and can't be changed.
void ForEachFlag(std::function<void(CommandLineFlag*)> visitor);
//-----------------------------------------------------------------------------
// Store the list of all flags in *OUTPUT, sorted by file.
void GetAllFlags(std::vector<CommandLineFlagInfo>* OUTPUT);
//-----------------------------------------------------------------------------
bool RegisterCommandLineFlag(CommandLineFlag*, const void* ptr = nullptr);
//-----------------------------------------------------------------------------
// Retired registrations:
//
// Retired flag registrations are treated specially. A 'retired' flag is
// provided only for compatibility with automated invocations that still
// name it. A 'retired' flag:
// - is not bound to a C++ FLAGS_ reference.
// - has a type and a value, but that value is intentionally inaccessible.
// - does not appear in --help messages.
// - is fully supported by _all_ flag parsing routines.
// - consumes args normally, and complains about type mismatches in its
// argument.
// - emits a complaint but does not die (e.g. LOG(ERROR)) if it is
// accessed by name through the flags API for parsing or otherwise.
//
// The registrations for a flag happen in an unspecified order as the
// initializers for the namespace-scope objects of a program are run.
// Any number of weak registrations for a flag can weakly define the flag.
// One non-weak registration will upgrade the flag from weak to non-weak.
// Further weak registrations of a non-weak flag are ignored.
//
// This mechanism is designed to support moving dead flags into a
// 'graveyard' library. An example migration:
//
// 0: Remove references to this FLAGS_flagname in the C++ codebase.
// 1: Register as 'retired' in old_lib.
// 2: Make old_lib depend on graveyard.
// 3: Add a redundant 'retired' registration to graveyard.
// 4: Remove the old_lib 'retired' registration.
// 5: Eventually delete the graveyard registration entirely.
//
// Returns bool to enable use in namespace-scope initializers.
// For example:
//
// static const bool dummy = base::RetiredFlag<int32_t>("myflag");
//
// Or to declare several at once:
//
// static bool dummies[] = {
// base::RetiredFlag<std::string>("some_string_flag"),
// base::RetiredFlag<double>("some_double_flag"),
// base::RetiredFlag<int32_t>("some_int32_flag")
// };
// Retire flag with name "name" and type indicated by ops.
bool Retire(FlagOpFn ops, FlagMarshallingOpFn marshalling_ops,
const char* name);
// Registered a retired flag with name 'flag_name' and type 'T'.
template <typename T>
inline bool RetiredFlag(const char* flag_name) {
return flags_internal::Retire(flags_internal::FlagOps<T>,
flags_internal::FlagMarshallingOps<T>,
flag_name);
}
// If the flag is retired, returns true and indicates in |*type_is_bool|
// whether the type of the retired flag is a bool.
// Only to be called by code that needs to explicitly ignore retired flags.
bool IsRetiredFlag(absl::string_view name, bool* type_is_bool);
//-----------------------------------------------------------------------------
// Saves the states (value, default value, whether the user has set
// the flag, registered validators, etc) of all flags, and restores
// them when the FlagSaver is destroyed.
//
// This class is thread-safe. However, its destructor writes to
// exactly the set of flags that have changed value during its
// lifetime, so concurrent _direct_ access to those flags
// (i.e. FLAGS_foo instead of {Get,Set}CommandLineOption()) is unsafe.
class FlagSaver {
public:
FlagSaver();
~FlagSaver();
FlagSaver(const FlagSaver&) = delete;
void operator=(const FlagSaver&) = delete;
// Prevents saver from restoring the saved state of flags.
void Ignore();
private:
class FlagSaverImpl* impl_; // we use pimpl here to keep API steady
};
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_REGISTRY_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/type_erased.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/flags/config.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/str_cat.h"
namespace absl {
namespace flags_internal {
bool GetCommandLineOption(absl::string_view name, std::string* value) {
if (name.empty()) return false;
assert(value);
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
if (flag == nullptr || flag->IsRetired()) {
return false;
}
absl::MutexLock l(InitFlagIfNecessary(flag));
*value = flag->CurrentValue();
return true;
}
bool GetCommandLineFlagInfo(absl::string_view name,
CommandLineFlagInfo* OUTPUT) {
if (name.empty()) return false;
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
if (flag == nullptr || flag->IsRetired()) {
return false;
}
assert(OUTPUT);
FillCommandLineFlagInfo(flag, OUTPUT);
return true;
}
CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name) {
CommandLineFlagInfo info;
if (!GetCommandLineFlagInfo(name, &info)) {
ABSL_INTERNAL_LOG(FATAL, absl::StrCat("Flag '", name, "' does not exist"));
}
return info;
}
// --------------------------------------------------------------------
bool SetCommandLineOption(absl::string_view name, absl::string_view value) {
return SetCommandLineOptionWithMode(name, value,
flags_internal::SET_FLAGS_VALUE);
}
bool SetCommandLineOptionWithMode(absl::string_view name,
absl::string_view value,
FlagSettingMode set_mode) {
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
if (!flag || flag->IsRetired()) return false;
std::string error;
if (!flag->SetFromString(value, set_mode, kProgrammaticChange, &error)) {
// Errors here are all of the form: the provided name was a recognized
// flag, but the value was invalid (bad type, or validation failed).
flags_internal::ReportUsageError(error, false);
return false;
}
return true;
}
// --------------------------------------------------------------------
bool IsValidFlagValue(absl::string_view name, absl::string_view value) {
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
if (flag == nullptr) {
return false;
}
if (flag->IsRetired()) {
return true;
}
// No need to lock the flag since we are not mutating it.
void* obj = Clone(flag->op, flag->def);
std::string ignored_error;
const bool result =
flags_internal::Parse(flag->marshalling_op, value, obj, &ignored_error) &&
Validate(flag, obj);
Delete(flag->op, obj);
return result;
}
// --------------------------------------------------------------------
bool SpecifiedOnCommandLine(absl::string_view name) {
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
if (flag != nullptr && !flag->IsRetired()) {
absl::MutexLock l(InitFlagIfNecessary(flag));
return flag->IsSpecifiedOnCommandLine();
}
return false;
}
} // namespace flags_internal
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
#define ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
#include <string>
#include "absl/flags/internal/commandlineflag.h"
#include "absl/flags/internal/registry.h"
// --------------------------------------------------------------------
// Registry interfaces operating on type erased handles.
namespace absl {
namespace flags_internal {
// If a flag named "name" exists, store its current value in *OUTPUT
// and return true. Else return false without changing *OUTPUT.
// Thread-safe.
bool GetCommandLineOption(absl::string_view name, std::string* value);
// If a flag named "name" exists, store its information in *OUTPUT
// and return true. Else return false without changing *OUTPUT.
// Thread-safe.
bool GetCommandLineFlagInfo(absl::string_view name,
CommandLineFlagInfo* OUTPUT);
// Returns the CommandLineFlagInfo of the flagname. exit() with an
// error code if name not found.
// Thread-safe.
CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name);
// Set the value of the flag named "name" to value. If successful,
// returns true. If not successful (e.g., the flag was not found or
// the value is not a valid value), returns false.
// Thread-safe.
bool SetCommandLineOption(absl::string_view name, absl::string_view value);
bool SetCommandLineOptionWithMode(absl::string_view name,
absl::string_view value,
FlagSettingMode set_mode);
//-----------------------------------------------------------------------------
// Returns true iff all of the following conditions are true:
// (a) "name" names a registered flag
// (b) "value" can be parsed succesfully according to the type of the flag
// (c) parsed value passes any validator associated with the flag
bool IsValidFlagValue(absl::string_view name, absl::string_view value);
//-----------------------------------------------------------------------------
// Returns true iff a flag named "name" was specified on the command line
// (either directly, or via one of --flagfile or --fromenv or --tryfromenv).
//
// Any non-command-line modification of the flag does not affect the
// result of this function. So for example, if a flag was passed on
// the command line but then reset via SET_FLAGS_DEFAULT, this
// function will still return true.
bool SpecifiedOnCommandLine(absl::string_view name);
//-----------------------------------------------------------------------------
// If a flag with specified "name" exists and has type T, store
// its current value in *dst and return true. Else return false
// without touching *dst. T must obey all of the requirements for
// types passed to DEFINE_FLAG.
template <typename T>
inline bool GetByName(absl::string_view name, T* dst) {
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
if (!flag) return false;
if (auto val = flag->Get<T>()) {
*dst = *val;
return true;
}
return false;
}
} // namespace flags_internal
} // namespace absl
#endif // ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/type_erased.h"
#include <cmath>
#include "gtest/gtest.h"
#include "absl/flags/flag.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
ABSL_FLAG(int, int_flag, 1, "int_flag help");
ABSL_FLAG(std::string, string_flag, "dflt", "string_flag help");
ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
namespace {
namespace flags = absl::flags_internal;
class TypeErasedTest : public testing::Test {
protected:
void SetUp() override { flag_saver_ = absl::make_unique<flags::FlagSaver>(); }
void TearDown() override { flag_saver_.reset(); }
private:
std::unique_ptr<flags::FlagSaver> flag_saver_;
};
// --------------------------------------------------------------------
TEST_F(TypeErasedTest, TestGetCommandLineOption) {
std::string value;
EXPECT_TRUE(flags::GetCommandLineOption("int_flag", &value));
EXPECT_EQ(value, "1");
EXPECT_TRUE(flags::GetCommandLineOption("string_flag", &value));
EXPECT_EQ(value, "dflt");
EXPECT_FALSE(flags::GetCommandLineOption("bool_retired_flag", &value));
EXPECT_FALSE(flags::GetCommandLineOption("unknown_flag", &value));
}
// --------------------------------------------------------------------
TEST_F(TypeErasedTest, TestSetCommandLineOption) {
EXPECT_TRUE(flags::SetCommandLineOption("int_flag", "101"));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
EXPECT_TRUE(flags::SetCommandLineOption("string_flag", "asdfgh"));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
EXPECT_FALSE(flags::SetCommandLineOption("bool_retired_flag", "true"));
EXPECT_FALSE(flags::SetCommandLineOption("unknown_flag", "true"));
}
// --------------------------------------------------------------------
TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_VALUE) {
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
flags::SET_FLAGS_VALUE));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
flags::SET_FLAGS_VALUE));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
flags::SET_FLAGS_VALUE));
EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
flags::SET_FLAGS_VALUE));
}
// --------------------------------------------------------------------
TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAG_IF_DEFAULT) {
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
flags::SET_FLAG_IF_DEFAULT));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
// This semantic is broken. We return true instead of false. Value is not
// updated.
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "202",
flags::SET_FLAG_IF_DEFAULT));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
flags::SET_FLAG_IF_DEFAULT));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
flags::SET_FLAG_IF_DEFAULT));
EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
flags::SET_FLAG_IF_DEFAULT));
}
// --------------------------------------------------------------------
TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_DEFAULT) {
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
flags::SET_FLAGS_DEFAULT));
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
flags::SET_FLAGS_DEFAULT));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
flags::SET_FLAGS_DEFAULT));
EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
flags::SET_FLAGS_DEFAULT));
// This should be successfull, since flag is still is not set
EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "202",
flags::SET_FLAG_IF_DEFAULT));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 202);
}
// --------------------------------------------------------------------
TEST_F(TypeErasedTest, TestIsValidFlagValue) {
EXPECT_TRUE(flags::IsValidFlagValue("int_flag", "57"));
EXPECT_TRUE(flags::IsValidFlagValue("int_flag", "-101"));
EXPECT_FALSE(flags::IsValidFlagValue("int_flag", "1.1"));
EXPECT_TRUE(flags::IsValidFlagValue("string_flag", "#%^#%^$%DGHDG$W%adsf"));
EXPECT_TRUE(flags::IsValidFlagValue("bool_retired_flag", "true"));
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/internal/usage.h"
#include <map>
#include <string>
#include "absl/flags/flag.h"
#include "absl/flags/internal/path_util.h"
#include "absl/flags/internal/program_name.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/ascii.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
#include "absl/synchronization/mutex.h"
ABSL_FLAG(bool, help, false,
"show help on important flags for this binary [tip: all flags can "
"have two dashes]");
ABSL_FLAG(bool, helpfull, false, "show help on all flags");
ABSL_FLAG(bool, helpshort, false,
"show help on only the main module for this program");
ABSL_FLAG(bool, helppackage, false,
"show help on all modules in the main package");
ABSL_FLAG(bool, version, false, "show version and build info and exit");
ABSL_FLAG(bool, only_check_args, false, "exit after checking all flags");
ABSL_FLAG(std::string, helpon, "",
"show help on the modules named by this flag value");
ABSL_FLAG(std::string, helpmatch, "",
"show help on modules whose name contains the specified substr");
namespace absl {
namespace flags_internal {
namespace {
// This class is used to emit an XML element with `tag` and `text`.
// It adds opening and closing tags and escapes special characters in the text.
// For example:
// std::cout << XMLElement("title", "Milk & Cookies");
// prints "<title>Milk &amp; Cookies</title>"
class XMLElement {
public:
XMLElement(absl::string_view tag, absl::string_view txt)
: tag_(tag), txt_(txt) {}
friend std::ostream& operator<<(std::ostream& out,
const XMLElement& xml_elem) {
out << "<" << xml_elem.tag_ << ">";
for (auto c : xml_elem.txt_) {
switch (c) {
case '"':
out << "&quot;";
break;
case '\'':
out << "&apos;";
break;
case '&':
out << "&amp;";
break;
case '<':
out << "&lt;";
break;
case '>':
out << "&gt;";
break;
default:
out << c;
break;
}
}
return out << "</" << xml_elem.tag_ << ">";
}
private:
absl::string_view tag_;
absl::string_view txt_;
};
// --------------------------------------------------------------------
// Helper class to pretty-print info about a flag.
class FlagHelpPrettyPrinter {
public:
// Pretty printer holds on to the std::ostream& reference to direct an output
// to that stream.
FlagHelpPrettyPrinter(int max_line_len, std::ostream* out)
: out_(*out),
max_line_len_(max_line_len),
line_len_(0),
first_line_(true) {}
void Write(absl::string_view str, bool wrap_line = false) {
// Empty std::string - do nothing.
if (str.empty()) return;
std::vector<absl::string_view> tokens;
if (wrap_line) {
tokens = absl::StrSplit(str, absl::ByAnyChar(" \f\n\r\t\v"),
absl::SkipEmpty());
} else {
tokens.push_back(str);
}
for (auto token : tokens) {
bool new_line = (line_len_ == 0);
// Write the token, ending the std::string first if necessary/possible.
if (!new_line && (line_len_ + token.size() >= max_line_len_)) {
EndLine();
new_line = true;
}
if (new_line) {
StartLine();
} else {
out_ << ' ';
++line_len_;
}
out_ << token;
line_len_ += token.size();
}
}
void StartLine() {
if (first_line_) {
out_ << " ";
line_len_ = 4;
first_line_ = false;
} else {
out_ << " ";
line_len_ = 6;
}
}
void EndLine() {
out_ << '\n';
line_len_ = 0;
}
private:
std::ostream& out_;
const int max_line_len_;
int line_len_;
bool first_line_;
};
void FlagHelpHumanReadable(const flags_internal::CommandLineFlag& flag,
std::ostream* out) {
FlagHelpPrettyPrinter printer(80, out); // Max line length is 80.
// Flag name.
printer.Write(absl::StrCat("-", flag.Name()));
// Flag help.
printer.Write(absl::StrCat("(", flag.Help(), ");"), /*wrap_line=*/true);
// Flag data type (for V1 flags only).
if (!flag.IsAbseilFlag() && !flag.IsRetired()) {
printer.Write(absl::StrCat("type: ", flag.Typename(), ";"));
}
// The listed default value will be the actual default from the flag
// definition in the originating source file, unless the value has
// subsequently been modified using SetCommandLineOption() with mode
// SET_FLAGS_DEFAULT.
std::string dflt_val = flag.DefaultValue();
if (flag.IsOfType<std::string>()) {
dflt_val = absl::StrCat("\"", dflt_val, "\"");
}
printer.Write(absl::StrCat("default: ", dflt_val, ";"));
if (flag.modified) {
std::string curr_val = flag.CurrentValue();
if (flag.IsOfType<std::string>()) {
curr_val = absl::StrCat("\"", curr_val, "\"");
}
printer.Write(absl::StrCat("currently: ", curr_val, ";"));
}
printer.EndLine();
}
// Shows help for every filename which matches any of the filters
// If filters are empty, shows help for every file.
// If a flag's help message has been stripped (e.g. by adding '#define
// STRIP_FLAG_HELP 1' then this flag will not be displayed by '--help'
// and its variants.
void FlagsHelpImpl(std::ostream& out, flags_internal::FlagKindFilter filter_cb,
HelpFormat format = HelpFormat::kHumanReadable) {
if (format == HelpFormat::kHumanReadable) {
out << flags_internal::ShortProgramInvocationName() << ": "
<< flags_internal::ProgramUsageMessage() << "\n\n";
} else {
// XML schema is not a part of our public API for now.
out << "<?xml version=\"1.0\"?>\n"
// The document.
<< "<AllFlags>\n"
// The program name and usage.
<< XMLElement("program", flags_internal::ShortProgramInvocationName())
<< '\n'
<< XMLElement("usage", flags_internal::ProgramUsageMessage()) << '\n';
}
// Map of package name to
// map of file name to
// vector of flags in the file.
// This map is used to output matching flags grouped by package and file
// name.
std::map<std::string,
std::map<std::string,
std::vector<const flags_internal::CommandLineFlag*>>>
matching_flags;
flags_internal::ForEachFlag([&](flags_internal::CommandLineFlag* flag) {
absl::MutexLock l(InitFlagIfNecessary(flag));
std::string flag_filename = flag->Filename();
// Ignore retired flags.
if (flag->IsRetired()) return;
// If the flag has been stripped, pretend that it doesn't exist.
if (flag->Help() == flags_internal::kStrippedFlagHelp) return;
// Make sure flag satisfies the filter
if (!filter_cb || !filter_cb(flag_filename)) return;
matching_flags[std::string(flags_internal::Package(flag_filename))]
[flag_filename]
.push_back(flag);
});
absl::string_view
package_separator; // controls blank lines between packages.
absl::string_view file_separator; // controls blank lines between files.
for (const auto& package : matching_flags) {
if (format == HelpFormat::kHumanReadable) {
out << package_separator;
package_separator = "\n\n";
}
file_separator = "";
for (const auto& flags_in_file : package.second) {
if (format == HelpFormat::kHumanReadable) {
out << file_separator << " Flags from " << flags_in_file.first
<< ":\n";
file_separator = "\n";
}
for (const auto* flag : flags_in_file.second) {
flags_internal::FlagHelp(out, *flag, format);
}
}
}
if (format == HelpFormat::kHumanReadable) {
if (filter_cb && matching_flags.empty()) {
out << " No modules matched: use -helpfull\n";
}
} else {
// The end of the document.
out << "</AllFlags>\n";
}
}
ABSL_CONST_INIT absl::Mutex usage_message_guard(absl::kConstInit);
ABSL_CONST_INIT std::string* program_usage_message
GUARDED_BY(usage_message_guard) = nullptr;
} // namespace
// --------------------------------------------------------------------
// Sets the "usage" message to be used by help reporting routines.
void SetProgramUsageMessage(absl::string_view new_usage_message) {
absl::MutexLock l(&usage_message_guard);
if (flags_internal::program_usage_message != nullptr) {
ABSL_INTERNAL_LOG(FATAL, "SetProgramUsageMessage() called twice.");
std::exit(1);
}
program_usage_message = new std::string(new_usage_message);
}
// --------------------------------------------------------------------
// Returns the usage message set by SetProgramUsageMessage().
// Note: We able to return string_view here only because calling
// SetProgramUsageMessage twice is prohibited.
absl::string_view ProgramUsageMessage() {
absl::MutexLock l(&usage_message_guard);
return program_usage_message != nullptr
? absl::string_view(*program_usage_message)
: "Warning: SetProgramUsageMessage() never called";
}
// --------------------------------------------------------------------
// Produces the help message describing specific flag.
void FlagHelp(std::ostream& out, const flags_internal::CommandLineFlag& flag,
HelpFormat format) {
if (format == HelpFormat::kHumanReadable)
flags_internal::FlagHelpHumanReadable(flag, &out);
}
// --------------------------------------------------------------------
// Produces the help messages for all flags matching the filter.
// If filter is empty produces help messages for all flags.
void FlagsHelp(std::ostream& out, absl::string_view filter, HelpFormat format) {
flags_internal::FlagKindFilter filter_cb = [&](absl::string_view filename) {
return filter.empty() || filename.find(filter) != absl::string_view::npos;
};
flags_internal::FlagsHelpImpl(out, filter_cb, format);
}
// --------------------------------------------------------------------
// Checks all the 'usage' command line flags to see if any have been set.
// If so, handles them appropriately.
int HandleUsageFlags(std::ostream& out) {
if (absl::GetFlag(FLAGS_helpshort)) {
flags_internal::FlagsHelpImpl(
out, flags_internal::GetUsageConfig().contains_helpshort_flags,
HelpFormat::kHumanReadable);
return 1;
}
if (absl::GetFlag(FLAGS_helpfull)) {
// show all options
flags_internal::FlagsHelp(out);
return 1;
}
if (!absl::GetFlag(FLAGS_helpon).empty()) {
flags_internal::FlagsHelp(
out, absl::StrCat("/", absl::GetFlag(FLAGS_helpon), "."));
return 1;
}
if (!absl::GetFlag(FLAGS_helpmatch).empty()) {
flags_internal::FlagsHelp(out, absl::GetFlag(FLAGS_helpmatch));
return 1;
}
if (absl::GetFlag(FLAGS_help)) {
flags_internal::FlagsHelpImpl(
out, flags_internal::GetUsageConfig().contains_help_flags);
out << "\nTry --helpfull to get a list of all flags.\n";
return 1;
}
if (absl::GetFlag(FLAGS_helppackage)) {
flags_internal::FlagsHelpImpl(
out, flags_internal::GetUsageConfig().contains_helppackage_flags);
out << "\nTry --helpfull to get a list of all flags.\n";
return 1;
}
if (absl::GetFlag(FLAGS_version)) {
if (flags_internal::GetUsageConfig().version_string)
out << flags_internal::GetUsageConfig().version_string();
// Unlike help, we may be asking for version in a script, so return 0
return 0;
}
if (absl::GetFlag(FLAGS_only_check_args)) {
return 0;
}
return -1;
}
} // namespace flags_internal
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_
#define ABSL_FLAGS_INTERNAL_USAGE_H_
#include <iosfwd>
#include <string>
#include "absl/flags/declare.h"
#include "absl/flags/internal/commandlineflag.h"
#include "absl/strings/string_view.h"
// --------------------------------------------------------------------
// Usage reporting interfaces
namespace absl {
namespace flags_internal {
// Sets the "usage" message to be used by help reporting routines.
// For example:
// absl::SetProgramUsageMessage(
// absl::StrCat("This program does nothing. Sample usage:\n", argv[0],
// " <uselessarg1> <uselessarg2>"));
// Do not include commandline flags in the usage: we do that for you!
// Note: Calling SetProgramUsageMessage twice will trigger a call to std::exit.
void SetProgramUsageMessage(absl::string_view new_usage_message);
// Returns the usage message set by SetProgramUsageMessage().
absl::string_view ProgramUsageMessage();
// --------------------------------------------------------------------
// The format to report the help messages in.
enum class HelpFormat {
kHumanReadable,
};
// Outputs the help message describing specific flag.
void FlagHelp(std::ostream& out, const flags_internal::CommandLineFlag& flag,
HelpFormat format = HelpFormat::kHumanReadable);
// Produces the help messages for all flags matching the filter. A flag matches
// the filter if it is defined in a file with a filename which includes
// filter string as a substring. You can use '/' and '.' to restrict the
// matching to a specific file names. For example:
// FlagsHelp(out, "/path/to/file.");
// restricts help to only flags which resides in files named like:
// .../path/to/file.<ext>
// for any extension 'ext'. If the filter is empty this function produces help
// messages for all flags.
void FlagsHelp(std::ostream& out, absl::string_view filter = {},
HelpFormat format = HelpFormat::kHumanReadable);
// --------------------------------------------------------------------
// If any of the 'usage' related command line flags (listed on the bottom of
// this file) has been set this routine produces corresponding help message in
// the specified output stream and returns:
// 0 - if "version" or "only_check_flags" flags were set and handled.
// 1 - if some other 'usage' related flag was set and handled.
// -1 - if no usage flags were set on a commmand line.
// Non negative return values are expected to be used as an exit code for a
// binary.
int HandleUsageFlags(std::ostream& out);
} // namespace flags_internal
} // namespace absl
ABSL_DECLARE_FLAG(bool, help);
ABSL_DECLARE_FLAG(bool, helpfull);
ABSL_DECLARE_FLAG(bool, helpshort);
ABSL_DECLARE_FLAG(bool, helppackage);
ABSL_DECLARE_FLAG(bool, version);
ABSL_DECLARE_FLAG(bool, only_check_args);
ABSL_DECLARE_FLAG(std::string, helpon);
ABSL_DECLARE_FLAG(std::string, helpmatch);
#endif // ABSL_FLAGS_INTERNAL_USAGE_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <sstream>
#include "gtest/gtest.h"
#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include "absl/flags/internal/path_util.h"
#include "absl/flags/internal/program_name.h"
#include "absl/flags/internal/usage.h"
#include "absl/flags/usage_config.h"
#include "absl/memory/memory.h"
#include "absl/strings/match.h"
ABSL_FLAG(int, usage_reporting_test_flag_01, 101,
"usage_reporting_test_flag_01 help message");
ABSL_FLAG(bool, usage_reporting_test_flag_02, false,
"usage_reporting_test_flag_02 help message");
ABSL_FLAG(double, usage_reporting_test_flag_03, 1.03,
"usage_reporting_test_flag_03 help message");
ABSL_FLAG(int64_t, usage_reporting_test_flag_04, 1000000000000004L,
"usage_reporting_test_flag_04 help message");
struct UDT {
UDT() = default;
UDT(const UDT&) = default;
};
bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
ABSL_FLAG(UDT, usage_reporting_test_flag_05, {},
"usage_reporting_test_flag_05 help message");
namespace {
namespace flags = absl::flags_internal;
static std::string NormalizeFileName(absl::string_view fname) {
#ifdef _WIN32
std::string normalized(fname);
std::replace(normalized.begin(), normalized.end(), '\\', '/');
fname = normalized;
#endif
auto absl_pos = fname.find("/absl/");
if (absl_pos != absl::string_view::npos) {
fname = fname.substr(absl_pos + 1);
}
return std::string(fname);
}
class UsageReportingTest : public testing::Test {
protected:
UsageReportingTest() {
// Install default config for the use on this unit test.
// Binary may install a custom config before tests are run.
absl::FlagsUsageConfig default_config;
default_config.normalize_filename = &NormalizeFileName;
absl::SetFlagsUsageConfig(default_config);
}
private:
flags::FlagSaver flag_saver_;
};
// --------------------------------------------------------------------
using UsageReportingDeathTest = UsageReportingTest;
TEST_F(UsageReportingDeathTest, TestSetProgramUsageMessage) {
EXPECT_EQ(flags::ProgramUsageMessage(), "Custom usage message");
#ifndef _WIN32
// TODO(rogeeff): figure out why this does not work on Windows.
EXPECT_DEATH(flags::SetProgramUsageMessage("custom usage message"),
".*SetProgramUsageMessage\\(\\) called twice.*");
#endif
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_01) {
const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_01");
std::stringstream test_buf;
flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
EXPECT_EQ(
test_buf.str(),
R"( -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
default: 101;
)");
}
TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_02) {
const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_02");
std::stringstream test_buf;
flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
EXPECT_EQ(
test_buf.str(),
R"( -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
default: false;
)");
}
TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_03) {
const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_03");
std::stringstream test_buf;
flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
EXPECT_EQ(
test_buf.str(),
R"( -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
default: 1.03;
)");
}
TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_04) {
const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_04");
std::stringstream test_buf;
flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
EXPECT_EQ(
test_buf.str(),
R"( -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
default: 1000000000000004;
)");
}
TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_05) {
const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_05");
std::stringstream test_buf;
flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
EXPECT_EQ(
test_buf.str(),
R"( -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
default: UDT{};
)");
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestFlagsHelpHRF) {
std::string usage_test_flags_out =
R"(usage_test: Custom usage message
Flags from absl/flags/internal/usage_test.cc:
-usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
default: 101;
-usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
default: false;
-usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
default: 1.03;
-usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
default: 1000000000000004;
-usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
default: UDT{};
)";
std::stringstream test_buf_01;
flags::FlagsHelp(test_buf_01, "usage_test.cc",
flags::HelpFormat::kHumanReadable);
EXPECT_EQ(test_buf_01.str(), usage_test_flags_out);
std::stringstream test_buf_02;
flags::FlagsHelp(test_buf_02, "flags/internal/usage_test.cc",
flags::HelpFormat::kHumanReadable);
EXPECT_EQ(test_buf_02.str(), usage_test_flags_out);
std::stringstream test_buf_03;
flags::FlagsHelp(test_buf_03, "usage_test",
flags::HelpFormat::kHumanReadable);
EXPECT_EQ(test_buf_03.str(), usage_test_flags_out);
std::stringstream test_buf_04;
flags::FlagsHelp(test_buf_04, "flags/invalid_file_name.cc",
flags::HelpFormat::kHumanReadable);
EXPECT_EQ(test_buf_04.str(),
R"(usage_test: Custom usage message
No modules matched: use -helpfull
)");
std::stringstream test_buf_05;
flags::FlagsHelp(test_buf_05, "", flags::HelpFormat::kHumanReadable);
std::string test_out = test_buf_05.str();
absl::string_view test_out_str(test_out);
EXPECT_TRUE(
absl::StartsWith(test_out_str, "usage_test: Custom usage message"));
EXPECT_TRUE(absl::StrContains(
test_out_str, "Flags from absl/flags/internal/usage_test.cc:"));
EXPECT_TRUE(absl::StrContains(test_out_str,
"Flags from absl/flags/internal/usage.cc:"));
EXPECT_TRUE(
absl::StrContains(test_out_str, "-usage_reporting_test_flag_01 "));
EXPECT_TRUE(absl::StrContains(test_out_str, "-help (show help"))
<< test_out_str;
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestNoUsageFlags) {
std::stringstream test_buf;
EXPECT_EQ(flags::HandleUsageFlags(test_buf), -1);
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestUsageFlag_helpshort) {
absl::SetFlag(&FLAGS_helpshort, true);
std::stringstream test_buf;
EXPECT_EQ(flags::HandleUsageFlags(test_buf), 1);
EXPECT_EQ(test_buf.str(),
R"(usage_test: Custom usage message
Flags from absl/flags/internal/usage_test.cc:
-usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
default: 101;
-usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
default: false;
-usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
default: 1.03;
-usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
default: 1000000000000004;
-usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
default: UDT{};
)");
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestUsageFlag_help) {
absl::SetFlag(&FLAGS_help, true);
std::stringstream test_buf;
EXPECT_EQ(flags::HandleUsageFlags(test_buf), 1);
EXPECT_EQ(test_buf.str(),
R"(usage_test: Custom usage message
Flags from absl/flags/internal/usage_test.cc:
-usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
default: 101;
-usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
default: false;
-usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
default: 1.03;
-usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
default: 1000000000000004;
-usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
default: UDT{};
Try --helpfull to get a list of all flags.
)");
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestUsageFlag_helppackage) {
absl::SetFlag(&FLAGS_helppackage, true);
std::stringstream test_buf;
EXPECT_EQ(flags::HandleUsageFlags(test_buf), 1);
EXPECT_EQ(test_buf.str(),
R"(usage_test: Custom usage message
Flags from absl/flags/internal/usage_test.cc:
-usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
default: 101;
-usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
default: false;
-usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
default: 1.03;
-usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
default: 1000000000000004;
-usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
default: UDT{};
Try --helpfull to get a list of all flags.
)");
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestUsageFlag_version) {
absl::SetFlag(&FLAGS_version, true);
std::stringstream test_buf;
EXPECT_EQ(flags::HandleUsageFlags(test_buf), 0);
#ifndef NDEBUG
EXPECT_EQ(test_buf.str(),
"usage_test\nDebug build (NDEBUG not #defined)\n");
#else
EXPECT_EQ(test_buf.str(), "usage_test\n");
#endif
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestUsageFlag_only_check_args) {
absl::SetFlag(&FLAGS_only_check_args, true);
std::stringstream test_buf;
EXPECT_EQ(flags::HandleUsageFlags(test_buf), 0);
EXPECT_EQ(test_buf.str(), "");
}
// --------------------------------------------------------------------
TEST_F(UsageReportingTest, TestUsageFlag_helpon) {
absl::SetFlag(&FLAGS_helpon, "bla-bla");
std::stringstream test_buf_01;
EXPECT_EQ(flags::HandleUsageFlags(test_buf_01), 1);
EXPECT_EQ(test_buf_01.str(),
R"(usage_test: Custom usage message
No modules matched: use -helpfull
)");
absl::SetFlag(&FLAGS_helpon, "usage_test");
std::stringstream test_buf_02;
EXPECT_EQ(flags::HandleUsageFlags(test_buf_02), 1);
EXPECT_EQ(test_buf_02.str(),
R"(usage_test: Custom usage message
Flags from absl/flags/internal/usage_test.cc:
-usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
default: 101;
-usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
default: false;
-usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
default: 1.03;
-usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
default: 1000000000000004;
-usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
default: UDT{};
)");
}
// --------------------------------------------------------------------
} // namespace
int main(int argc, char* argv[]) {
absl::GetFlag(FLAGS_undefok); // Force linking of parse.cc
flags::SetProgramInvocationName("usage_test");
flags::SetProgramUsageMessage("Custom usage message");
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/marshalling.h"
#include <limits>
#include "absl/base/macros.h"
#include "absl/strings/match.h"
#include "absl/strings/numbers.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_format.h"
#include "absl/strings/str_join.h"
#include "absl/strings/str_split.h"
namespace absl {
namespace flags_internal {
// --------------------------------------------------------------------
// AbslParseFlag specializations for boolean type.
bool AbslParseFlag(absl::string_view text, bool* dst, std::string*) {
const char* kTrue[] = {"1", "t", "true", "y", "yes"};
const char* kFalse[] = {"0", "f", "false", "n", "no"};
static_assert(sizeof(kTrue) == sizeof(kFalse), "true_false_equal");
text = absl::StripAsciiWhitespace(text);
for (size_t i = 0; i < ABSL_ARRAYSIZE(kTrue); ++i) {
if (absl::EqualsIgnoreCase(text, kTrue[i])) {
*dst = true;
return true;
} else if (absl::EqualsIgnoreCase(text, kFalse[i])) {
*dst = false;
return true;
}
}
return false; // didn't match a legal input
}
// --------------------------------------------------------------------
// AbslParseFlag for integral types.
// Return the base to use for parsing text as an integer. Leading 0x
// puts us in base 16. But leading 0 does not put us in base 8. It
// caused too many bugs when we had that behavior.
static int NumericBase(absl::string_view text) {
const bool hex = (text.size() >= 2 && text[0] == '0' &&
(text[1] == 'x' || text[1] == 'X'));
return hex ? 16 : 10;
}
template <typename IntType>
inline bool ParseFlagImpl(absl::string_view text, IntType* dst) {
text = absl::StripAsciiWhitespace(text);
return absl::numbers_internal::safe_strtoi_base(text, dst, NumericBase(text));
}
bool AbslParseFlag(absl::string_view text, short* dst, std::string*) {
int val;
if (!ParseFlagImpl(text, &val)) return false;
if (static_cast<short>(val) != val) // worked, but number out of range
return false;
*dst = static_cast<short>(val);
return true;
}
bool AbslParseFlag(absl::string_view text, unsigned short* dst, std::string*) {
unsigned int val;
if (!ParseFlagImpl(text, &val)) return false;
if (static_cast<unsigned short>(val) !=
val) // worked, but number out of range
return false;
*dst = static_cast<unsigned short>(val);
return true;
}
bool AbslParseFlag(absl::string_view text, int* dst, std::string*) {
return ParseFlagImpl(text, dst);
}
bool AbslParseFlag(absl::string_view text, unsigned int* dst, std::string*) {
return ParseFlagImpl(text, dst);
}
bool AbslParseFlag(absl::string_view text, long* dst, std::string*) {
return ParseFlagImpl(text, dst);
}
bool AbslParseFlag(absl::string_view text, unsigned long* dst, std::string*) {
return ParseFlagImpl(text, dst);
}
bool AbslParseFlag(absl::string_view text, long long* dst, std::string*) {
return ParseFlagImpl(text, dst);
}
bool AbslParseFlag(absl::string_view text, unsigned long long* dst,
std::string*) {
return ParseFlagImpl(text, dst);
}
// --------------------------------------------------------------------
// AbslParseFlag for floating point types.
bool AbslParseFlag(absl::string_view text, float* dst, std::string*) {
return absl::SimpleAtof(text, dst);
}
bool AbslParseFlag(absl::string_view text, double* dst, std::string*) {
return absl::SimpleAtod(text, dst);
}
// --------------------------------------------------------------------
// AbslParseFlag for strings.
bool AbslParseFlag(absl::string_view text, std::string* dst, std::string*) {
dst->assign(text.data(), text.size());
return true;
}
// --------------------------------------------------------------------
// AbslParseFlag for vector of strings.
bool AbslParseFlag(absl::string_view text, std::vector<std::string>* dst,
std::string*) {
// An empty flag value corresponds to an empty vector, not a vector
// with a single, empty std::string.
if (text.empty()) {
dst->clear();
return true;
}
*dst = absl::StrSplit(text, ',', absl::AllowEmpty());
return true;
}
// --------------------------------------------------------------------
// AbslUnparseFlag specializations for various builtin flag types.
std::string Unparse(bool v) { return v ? "true" : "false"; }
std::string Unparse(short v) { return absl::StrCat(v); }
std::string Unparse(unsigned short v) { return absl::StrCat(v); }
std::string Unparse(int v) { return absl::StrCat(v); }
std::string Unparse(unsigned int v) { return absl::StrCat(v); }
std::string Unparse(long v) { return absl::StrCat(v); }
std::string Unparse(unsigned long v) { return absl::StrCat(v); }
std::string Unparse(long long v) { return absl::StrCat(v); }
std::string Unparse(unsigned long long v) { return absl::StrCat(v); }
template <typename T>
std::string UnparseFloatingPointVal(T v) {
// digits10 is guaranteed to roundtrip correctly in std::string -> value -> std::string
// conversions, but may not be enough to represent all the values correctly.
std::string digit10_str =
absl::StrFormat("%.*g", std::numeric_limits<T>::digits10, v);
if (std::isnan(v) || std::isinf(v)) return digit10_str;
T roundtrip_val = 0;
std::string err;
if (absl::ParseFlag(digit10_str, &roundtrip_val, &err) &&
roundtrip_val == v) {
return digit10_str;
}
// max_digits10 is the number of base-10 digits that are necessary to uniquely
// represent all distinct values.
return absl::StrFormat("%.*g", std::numeric_limits<T>::max_digits10, v);
}
std::string Unparse(float v) { return UnparseFloatingPointVal(v); }
std::string Unparse(double v) { return UnparseFloatingPointVal(v); }
std::string AbslUnparseFlag(absl::string_view v) { return std::string(v); }
std::string AbslUnparseFlag(const std::vector<std::string>& v) {
return absl::StrJoin(v, ",");
}
} // namespace flags_internal
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: marshalling.h
// -----------------------------------------------------------------------------
//
// This header file defines the API for extending Abseil flag support to
// custom types, and defines the set of overloads for fundamental types.
//
// Out of the box, the Abseil flags library supports the following types:
//
// * `bool`
// * `int16_t`
// * `uint16_t`
// * `int32_t`
// * `uint32_t`
// * `int64_t`
// * `uint64_t`
// * `float`
// * `double`
// * `std::string`
// * `std::vector<std::string>`
//
// Note that support for integral types is implemented using overloads for
// variable-width fundamental types (`short`, `int`, `long`, etc.). However,
// you should prefer the fixed-width integral types (`int32_t`, `uint64_t`,
// etc.) we've noted above within flag definitions.
//
// In addition, several Abseil libraries provide their own custom support for
// Abseil flags.
//
// The Abseil time library provides the following support for civil time values:
//
// * `absl::CivilSecond`
// * `absl::CivilMinute`
// * `absl::CivilHour`
// * `absl::CivilDay`
// * `absl::CivilMonth`
// * `absl::CivilYear`
//
// and also provides support for the following absolute time values:
//
// * `absl::Duration`
// * `absl::Time`
//
// Additional support for Abseil types will be noted here as it is added.
//
// You can also provide your own custom flags by adding overloads for
// `AbslParseFlag()` and `AbslUnparseFlag()` to your type definitions. (See
// below.)
//
// -----------------------------------------------------------------------------
// Adding Type Support for Abseil Flags
// -----------------------------------------------------------------------------
//
// To add support for your user-defined type, add overloads of `AbslParseFlag()`
// and `AbslUnparseFlag()` as free (non-member) functions to your type. If `T`
// is a class type, these functions can be friend function definitions. These
// overloads must be added to the same namespace where the type is defined, so
// that they can be discovered by Argument-Dependent Lookup (ADL).
//
// Example:
//
// namespace foo {
//
// enum OutputMode { kPlainText, kHtml };
//
// // AbslParseFlag converts from a string to OutputMode.
// // Must be in same namespace as OutputMode.
//
// // Parses an OutputMode from the command line flag value `text. Returns
// // `true` and sets `*mode` on success; returns `false` and sets `*error`
// // on failure.
// bool AbslParseFlag(absl::string_view text,
// OutputMode* mode,
// std::string* error) {
// if (text == "plaintext") {
// *mode = kPlainText;
// return true;
// }
// if (text == "html") {
// *mode = kHtml;
// return true;
// }
// *error = "unknown value for enumeration";
// return false;
// }
//
// // AbslUnparseFlag converts from an OutputMode to a string.
// // Must be in same namespace as OutputMode.
//
// // Returns a textual flag value corresponding to the OutputMode `mode`.
// std::string AbslUnparseFlag(OutputMode mode) {
// switch (mode) {
// case kPlainText: return "plaintext";
// case kHtml: return "html";
// default: return SimpleItoa(mode);
// }
// }
//
// Notice that neither `AbslParseFlag()` nor `AbslUnparseFlag()` are class
// members, but free functions. `AbslParseFlag/AbslUnparseFlag()` overloads
// for a type should only be declared in the same file and namespace as said
// type. The proper `AbslParseFlag/AbslUnparseFlag()` implementations for a
// given type will be discovered via Argument-Dependent Lookup (ADL).
//
// `AbslParseFlag()` may need, in turn, to parse simpler constituent types
// using `absl::ParseFlag()`. For example, a custom struct `MyFlagType`
// consisting of a `std::pair<int, std::string>` would add an `AbslParseFlag()`
// overload for its `MyFlagType` like so:
//
// Example:
//
// namespace my_flag_type {
//
// struct MyFlagType {
// std::pair<int, std::string> my_flag_data;
// };
//
// bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
// std::string* err);
//
// std::string AbslUnparseFlag(const MyFlagType&);
//
// // Within the implementation, `AbslParseFlag()` will, in turn invoke
// // `absl::ParseFlag()` on its constituent `int` and `std::string` types
// // (which have built-in Abseil flag support.
//
// bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
// std::string* err) {
// std::pair<absl::string_view, absl::string_view> tokens =
// absl::StrSplit(text, ',');
// if (!absl::ParseFlag(tokens.first, &flag->my_flag_data.first, err))
// return false;
// if (!absl::ParseFlag(tokens.second, &flag->my_flag_data.second, err))
// return false;
// return true;
// }
//
// // Similarly, for unparsing, we can simply invoke `absl::UnparseFlag()` on
// // the constituent types.
// std::string AbslUnparseFlag(const MyFlagType& flag) {
// return absl::StrCat(absl::UnparseFlag(flag.my_flag_data.first),
// ",",
// absl::UnparseFlag(flag.my_flag_data.second));
// }
#ifndef ABSL_FLAGS_MARSHALLING_H_
#define ABSL_FLAGS_MARSHALLING_H_
#include <string>
#include <vector>
#include "absl/strings/string_view.h"
namespace absl {
namespace flags_internal {
// Overloads of `AbslParseFlag()` and `AbslUnparseFlag()` for fundamental types.
bool AbslParseFlag(absl::string_view, bool*, std::string*);
bool AbslParseFlag(absl::string_view, short*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, unsigned short*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, int*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, unsigned int*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, long*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, unsigned long*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, long long*, std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, unsigned long long*,
std::string*); // NOLINT
bool AbslParseFlag(absl::string_view, float*, std::string*);
bool AbslParseFlag(absl::string_view, double*, std::string*);
bool AbslParseFlag(absl::string_view, std::string*, std::string*);
bool AbslParseFlag(absl::string_view, std::vector<std::string>*, std::string*);
struct GlobalStringADLGuard {
explicit GlobalStringADLGuard(std::string* p) : ptr(p) {}
operator std::string*() { return ptr; } // NOLINT
std::string* ptr;
};
template <typename T>
bool InvokeParseFlag(absl::string_view input, T* dst, std::string* err) {
// Comment on next line provides a good compiler error message if T
// does not have AbslParseFlag(absl::string_view, T*, std::string*).
return AbslParseFlag( // Is T missing AbslParseFlag?
input, dst, GlobalStringADLGuard(err));
}
// Strings and std:: containers do not have the same overload resolution
// considerations as fundamental types. Naming these 'AbslUnparseFlag' means we
// can avoid the need for additional specializations of Unparse (below).
std::string AbslUnparseFlag(absl::string_view v);
std::string AbslUnparseFlag(const std::vector<std::string>&);
template <typename T>
std::string Unparse(const T& v) {
// Comment on next line provides a good compiler error message if T does not
// have UnparseFlag.
return AbslUnparseFlag(v); // Is T missing AbslUnparseFlag?
}
// Overloads for builtin types.
std::string Unparse(bool v);
std::string Unparse(short v); // NOLINT
std::string Unparse(unsigned short v); // NOLINT
std::string Unparse(int v); // NOLINT
std::string Unparse(unsigned int v); // NOLINT
std::string Unparse(long v); // NOLINT
std::string Unparse(unsigned long v); // NOLINT
std::string Unparse(long long v); // NOLINT
std::string Unparse(unsigned long long v); // NOLINT
std::string Unparse(float v);
std::string Unparse(double v);
} // namespace flags_internal
// ParseFlag()
//
// Parses a string value into a flag value of type `T`. Do not add overloads of
// this function for your type directly; instead, add an `AbslParseFlag()`
// free function as documented above.
//
// Some implementations of `AbslParseFlag()` for types which consist of other,
// constituent types which already have Abseil flag support, may need to call
// `absl::ParseFlag()` on those consituent string values. (See above.)
template <typename T>
inline bool ParseFlag(absl::string_view input, T* dst, std::string* error) {
return flags_internal::InvokeParseFlag(input, dst, error);
}
// UnparseFlag()
//
// Unparses a flag value of type `T` into a string value. Do not add overloads
// of this function for your type directly; instead, add an `AbslUnparseFlag()`
// free function as documented above.
//
// Some implementations of `AbslUnparseFlag()` for types which consist of other,
// constituent types which already have Abseil flag support, may want to call
// `absl::UnparseFlag()` on those constituent types. (See above.)
template <typename T>
inline std::string UnparseFlag(const T& v) {
return flags_internal::Unparse(v);
}
} // namespace absl
#endif // ABSL_FLAGS_MARSHALLING_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/marshalling.h"
#include <cmath>
#include "gtest/gtest.h"
namespace {
TEST(MarshallingTest, TestBoolParsing) {
std::string err;
bool value;
// True values.
EXPECT_TRUE(absl::ParseFlag("True", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("true", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("TRUE", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("Yes", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("yes", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("YES", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("t", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("T", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("y", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("Y", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_TRUE(value);
// False values.
EXPECT_TRUE(absl::ParseFlag("False", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("false", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("FALSE", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("No", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("no", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("NO", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("f", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("F", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("n", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("N", &value, &err));
EXPECT_FALSE(value);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_FALSE(value);
// Whitespace handling.
EXPECT_TRUE(absl::ParseFlag(" true", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag("true ", &value, &err));
EXPECT_TRUE(value);
EXPECT_TRUE(absl::ParseFlag(" true ", &value, &err));
EXPECT_TRUE(value);
// Invalid input.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2", &value, &err));
EXPECT_FALSE(absl::ParseFlag("11", &value, &err));
EXPECT_FALSE(absl::ParseFlag("tt", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestInt16Parsing) {
std::string err;
int16_t value;
// Decimal values.
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
EXPECT_EQ(value, -1);
EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
EXPECT_EQ(value, 123);
EXPECT_TRUE(absl::ParseFlag("-18765", &value, &err));
EXPECT_EQ(value, -18765);
EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
EXPECT_EQ(value, 3);
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
EXPECT_EQ(value, -1);
EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
EXPECT_EQ(value, 100);
// Hex values.
EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
EXPECT_EQ(value, 16);
EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
EXPECT_EQ(value, 564);
// TODO(rogeeff): fix below validations
EXPECT_FALSE(absl::ParseFlag("-0x7FFD", &value, &err));
EXPECT_NE(value, -3);
EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
EXPECT_NE(value, 49);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
EXPECT_EQ(value, 10);
EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
EXPECT_EQ(value, 11);
EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
EXPECT_EQ(value, 12);
EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
EXPECT_EQ(value, 34);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("40000", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestUint16Parsing) {
std::string err;
uint16_t value;
// Decimal values.
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
EXPECT_EQ(value, 123);
EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
EXPECT_EQ(value, 3);
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
EXPECT_EQ(value, 100);
// Hex values.
EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
EXPECT_EQ(value, 16);
EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
EXPECT_EQ(value, 564);
// TODO(rogeeff): fix below validations
EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
EXPECT_NE(value, 49);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
EXPECT_EQ(value, 10);
EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
EXPECT_EQ(value, 11);
EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
EXPECT_EQ(value, 12);
EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
EXPECT_EQ(value, 34);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("70000", &value, &err));
EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestInt32Parsing) {
std::string err;
int32_t value;
// Decimal values.
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
EXPECT_EQ(value, -1);
EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
EXPECT_EQ(value, 123);
EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
EXPECT_EQ(value, -98765);
EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
EXPECT_EQ(value, 3);
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
EXPECT_EQ(value, -1);
EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
EXPECT_EQ(value, 100);
// Hex values.
EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
EXPECT_EQ(value, 16);
EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
EXPECT_EQ(value, 564);
// TODO(rogeeff): fix below validations
EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFD", &value, &err));
EXPECT_NE(value, -3);
EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
EXPECT_NE(value, 49);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
EXPECT_EQ(value, 10);
EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
EXPECT_EQ(value, 11);
EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
EXPECT_EQ(value, 12);
EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
EXPECT_EQ(value, 34);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("70000000000", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestUint32Parsing) {
std::string err;
uint32_t value;
// Decimal values.
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
EXPECT_EQ(value, 123);
EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
EXPECT_EQ(value, 3);
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
EXPECT_EQ(value, 100);
// Hex values.
EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
EXPECT_EQ(value, 16);
EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
EXPECT_EQ(value, 564);
EXPECT_TRUE(absl::ParseFlag("0xFFFFFFFD", &value, &err));
EXPECT_EQ(value, 4294967293);
// TODO(rogeeff): fix below validations
EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
EXPECT_NE(value, 49);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
EXPECT_EQ(value, 10);
EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
EXPECT_EQ(value, 11);
EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
EXPECT_EQ(value, 12);
EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
EXPECT_EQ(value, 34);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("140000000000", &value, &err));
EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestInt64Parsing) {
std::string err;
int64_t value;
// Decimal values.
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
EXPECT_EQ(value, -1);
EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
EXPECT_EQ(value, 123);
EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
EXPECT_EQ(value, -98765);
EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
EXPECT_EQ(value, 3);
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
EXPECT_EQ(value, 100);
// Hex values.
EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
EXPECT_EQ(value, 16);
EXPECT_TRUE(absl::ParseFlag("0XFFFAAABBBCCCDDD", &value, &err));
EXPECT_EQ(value, 1152827684197027293);
// TODO(rogeeff): fix below validation
EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFFFFFFFFFE", &value, &err));
EXPECT_NE(value, -2);
EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
EXPECT_NE(value, 49);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
EXPECT_EQ(value, 10);
EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
EXPECT_EQ(value, 11);
EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
EXPECT_EQ(value, 12);
EXPECT_TRUE(absl::ParseFlag(" 0x7F ", &value, &err));
EXPECT_EQ(value, 127);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestUInt64Parsing) {
std::string err;
uint64_t value;
// Decimal values.
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
EXPECT_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
EXPECT_EQ(value, 123);
EXPECT_TRUE(absl::ParseFlag("+13", &value, &err));
EXPECT_EQ(value, 13);
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
EXPECT_EQ(value, 1);
EXPECT_TRUE(absl::ParseFlag("0000300", &value, &err));
EXPECT_EQ(value, 300);
// Hex values.
EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
EXPECT_EQ(value, 16);
EXPECT_TRUE(absl::ParseFlag("0XFFFF", &value, &err));
EXPECT_EQ(value, 65535);
// TODO(rogeeff): fix below validation
EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
EXPECT_NE(value, 49);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
EXPECT_EQ(value, 10);
EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
EXPECT_EQ(value, 11);
EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
EXPECT_EQ(value, 12);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestFloatParsing) {
std::string err;
float value;
// Ordinary values.
EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
EXPECT_FLOAT_EQ(value, 1.3f);
EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
EXPECT_DOUBLE_EQ(value, -0.1f);
EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.01f);
// Scientific values.
EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
EXPECT_DOUBLE_EQ(value, 1.2e3f);
EXPECT_TRUE(absl::ParseFlag("9.8765402e-37", &value, &err));
EXPECT_DOUBLE_EQ(value, 9.8765402e-37f);
EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.11e+3f);
EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.f);
EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
EXPECT_TRUE(std::isinf(value));
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
EXPECT_DOUBLE_EQ(value, 1.6f);
EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.0001f);
// Trailing zero values.
EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
EXPECT_DOUBLE_EQ(value, -5.1f);
// Exceptional values.
EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
EXPECT_TRUE(std::isnan(value));
EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
EXPECT_TRUE(std::isinf(value));
// Hex values
EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
EXPECT_DOUBLE_EQ(value, 66096.f);
EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
EXPECT_NEAR(value, -60.4092f, 5e-5f);
EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
EXPECT_NEAR(value, 1.01328e-05f, 5e-11f);
EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
EXPECT_NEAR(value, 0.0078125f, 5e-8f);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10.1 ", &value, &err));
EXPECT_DOUBLE_EQ(value, 10.1f);
EXPECT_TRUE(absl::ParseFlag(" 2.34", &value, &err));
EXPECT_DOUBLE_EQ(value, 2.34f);
EXPECT_TRUE(absl::ParseFlag(" 5.7 ", &value, &err));
EXPECT_DOUBLE_EQ(value, 5.7f);
EXPECT_TRUE(absl::ParseFlag(" -0xE0.F3p01 ", &value, &err));
EXPECT_NEAR(value, -449.8984375f, 5e-8f);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
// TODO(rogeeff): below assertion should fail
EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestDoubleParsing) {
std::string err;
double value;
// Ordinary values.
EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
EXPECT_DOUBLE_EQ(value, 1.3);
EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
EXPECT_DOUBLE_EQ(value, -0.1);
EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.01);
// Scientific values.
EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
EXPECT_DOUBLE_EQ(value, 1.2e3);
EXPECT_TRUE(absl::ParseFlag("9.00000002e-123", &value, &err));
EXPECT_DOUBLE_EQ(value, 9.00000002e-123);
EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.11e+3);
EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
EXPECT_DOUBLE_EQ(value, 0);
EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
EXPECT_TRUE(std::isinf(value));
// Leading zero values.
EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
EXPECT_DOUBLE_EQ(value, 1.6);
EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
EXPECT_DOUBLE_EQ(value, 0.0001);
// Trailing zero values.
EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
EXPECT_DOUBLE_EQ(value, -5.1);
// Exceptional values.
EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
EXPECT_TRUE(std::isnan(value));
EXPECT_TRUE(absl::ParseFlag("nan", &value, &err));
EXPECT_TRUE(std::isnan(value));
EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
EXPECT_TRUE(std::isinf(value));
EXPECT_TRUE(absl::ParseFlag("inf", &value, &err));
EXPECT_TRUE(std::isinf(value));
// Hex values
EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
EXPECT_DOUBLE_EQ(value, 66096);
EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
EXPECT_NEAR(value, -60.4092, 5e-5);
EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
EXPECT_NEAR(value, 1.01328e-05, 5e-11);
EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
EXPECT_NEAR(value, 0.0078125, 5e-8);
// Whitespace handling
EXPECT_TRUE(absl::ParseFlag("10.1 ", &value, &err));
EXPECT_DOUBLE_EQ(value, 10.1);
EXPECT_TRUE(absl::ParseFlag(" 2.34", &value, &err));
EXPECT_DOUBLE_EQ(value, 2.34);
EXPECT_TRUE(absl::ParseFlag(" 5.7 ", &value, &err));
EXPECT_DOUBLE_EQ(value, 5.7);
EXPECT_TRUE(absl::ParseFlag(" -0xE0.F3p01 ", &value, &err));
EXPECT_NEAR(value, -449.8984375, 5e-8);
// Invalid values.
EXPECT_FALSE(absl::ParseFlag("", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
// TODO(rogeeff): below assertion should fail
EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestStringParsing) {
std::string err;
std::string value;
EXPECT_TRUE(absl::ParseFlag("", &value, &err));
EXPECT_EQ(value, "");
EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
EXPECT_EQ(value, " ");
EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
EXPECT_EQ(value, " ");
EXPECT_TRUE(absl::ParseFlag("\n", &value, &err));
EXPECT_EQ(value, "\n");
EXPECT_TRUE(absl::ParseFlag("\t", &value, &err));
EXPECT_EQ(value, "\t");
EXPECT_TRUE(absl::ParseFlag("asdfg", &value, &err));
EXPECT_EQ(value, "asdfg");
EXPECT_TRUE(absl::ParseFlag("asdf ghjk", &value, &err));
EXPECT_EQ(value, "asdf ghjk");
EXPECT_TRUE(absl::ParseFlag("a\nb\nc", &value, &err));
EXPECT_EQ(value, "a\nb\nc");
EXPECT_TRUE(absl::ParseFlag("asd\0fgh", &value, &err));
EXPECT_EQ(value, "asd");
EXPECT_TRUE(absl::ParseFlag("\\\\", &value, &err));
EXPECT_EQ(value, "\\\\");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestVectorOfStringParsing) {
std::string err;
std::vector<std::string> value;
EXPECT_TRUE(absl::ParseFlag("", &value, &err));
EXPECT_EQ(value, std::vector<std::string>{});
EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
EXPECT_EQ(value, std::vector<std::string>({"1"}));
EXPECT_TRUE(absl::ParseFlag("a,b", &value, &err));
EXPECT_EQ(value, std::vector<std::string>({"a", "b"}));
EXPECT_TRUE(absl::ParseFlag("a,b,c,", &value, &err));
EXPECT_EQ(value, std::vector<std::string>({"a", "b", "c", ""}));
EXPECT_TRUE(absl::ParseFlag("a,,", &value, &err));
EXPECT_EQ(value, std::vector<std::string>({"a", "", ""}));
EXPECT_TRUE(absl::ParseFlag(",", &value, &err));
EXPECT_EQ(value, std::vector<std::string>({"", ""}));
EXPECT_TRUE(absl::ParseFlag("a, b,c ", &value, &err));
EXPECT_EQ(value, std::vector<std::string>({"a", " b", "c "}));
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestBoolUnparsing) {
EXPECT_EQ(absl::UnparseFlag(true), "true");
EXPECT_EQ(absl::UnparseFlag(false), "false");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestInt16Unparsing) {
int16_t value;
value = 1;
EXPECT_EQ(absl::UnparseFlag(value), "1");
value = 0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = -1;
EXPECT_EQ(absl::UnparseFlag(value), "-1");
value = 9876;
EXPECT_EQ(absl::UnparseFlag(value), "9876");
value = -987;
EXPECT_EQ(absl::UnparseFlag(value), "-987");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestUint16Unparsing) {
uint16_t value;
value = 1;
EXPECT_EQ(absl::UnparseFlag(value), "1");
value = 0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = 19876;
EXPECT_EQ(absl::UnparseFlag(value), "19876");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestInt32Unparsing) {
int32_t value;
value = 1;
EXPECT_EQ(absl::UnparseFlag(value), "1");
value = 0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = -1;
EXPECT_EQ(absl::UnparseFlag(value), "-1");
value = 12345;
EXPECT_EQ(absl::UnparseFlag(value), "12345");
value = -987;
EXPECT_EQ(absl::UnparseFlag(value), "-987");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestUint32Unparsing) {
uint32_t value;
value = 1;
EXPECT_EQ(absl::UnparseFlag(value), "1");
value = 0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = 1234500;
EXPECT_EQ(absl::UnparseFlag(value), "1234500");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestInt64Unparsing) {
int64_t value;
value = 1;
EXPECT_EQ(absl::UnparseFlag(value), "1");
value = 0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = -1;
EXPECT_EQ(absl::UnparseFlag(value), "-1");
value = 123456789L;
EXPECT_EQ(absl::UnparseFlag(value), "123456789");
value = -987654321L;
EXPECT_EQ(absl::UnparseFlag(value), "-987654321");
value = 0x7FFFFFFFFFFFFFFF;
EXPECT_EQ(absl::UnparseFlag(value), "9223372036854775807");
value = 0xFFFFFFFFFFFFFFFF;
EXPECT_EQ(absl::UnparseFlag(value), "-1");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestUint64Unparsing) {
uint64_t value;
value = 1;
EXPECT_EQ(absl::UnparseFlag(value), "1");
value = 0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = 123456789L;
EXPECT_EQ(absl::UnparseFlag(value), "123456789");
value = 0xFFFFFFFFFFFFFFFF;
EXPECT_EQ(absl::UnparseFlag(value), "18446744073709551615");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestFloatUnparsing) {
float value;
value = 1.1f;
EXPECT_EQ(absl::UnparseFlag(value), "1.1");
value = 0.01f;
EXPECT_EQ(absl::UnparseFlag(value), "0.01");
value = 1.23e-2f;
EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
value = -0.71f;
EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestDoubleUnparsing) {
double value;
value = 1.1;
EXPECT_EQ(absl::UnparseFlag(value), "1.1");
value = 0.01;
EXPECT_EQ(absl::UnparseFlag(value), "0.01");
value = 1.23e-2;
EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
value = -0.71;
EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
value = -0;
EXPECT_EQ(absl::UnparseFlag(value), "0");
value = std::nan("");
EXPECT_EQ(absl::UnparseFlag(value), "nan");
value = std::numeric_limits<double>::infinity();
EXPECT_EQ(absl::UnparseFlag(value), "inf");
}
// --------------------------------------------------------------------
TEST(MarshallingTest, TestStringUnparsing) {
EXPECT_EQ(absl::UnparseFlag(""), "");
EXPECT_EQ(absl::UnparseFlag(" "), " ");
EXPECT_EQ(absl::UnparseFlag("qwerty"), "qwerty");
EXPECT_EQ(absl::UnparseFlag("ASDFGH"), "ASDFGH");
EXPECT_EQ(absl::UnparseFlag("\n\t "), "\n\t ");
}
// --------------------------------------------------------------------
template <typename T>
void TestRoundtrip(T v) {
T new_v;
std::string err;
EXPECT_TRUE(absl::ParseFlag(absl::UnparseFlag(v), &new_v, &err));
EXPECT_EQ(new_v, v);
}
TEST(MarshallingTest, TestFloatRoundTrip) {
TestRoundtrip(0.1f);
TestRoundtrip(0.12f);
TestRoundtrip(0.123f);
TestRoundtrip(0.1234f);
TestRoundtrip(0.12345f);
TestRoundtrip(0.123456f);
TestRoundtrip(0.1234567f);
TestRoundtrip(0.12345678f);
TestRoundtrip(0.1e20f);
TestRoundtrip(0.12e20f);
TestRoundtrip(0.123e20f);
TestRoundtrip(0.1234e20f);
TestRoundtrip(0.12345e20f);
TestRoundtrip(0.123456e20f);
TestRoundtrip(0.1234567e20f);
TestRoundtrip(0.12345678e20f);
TestRoundtrip(0.1e-20f);
TestRoundtrip(0.12e-20f);
TestRoundtrip(0.123e-20f);
TestRoundtrip(0.1234e-20f);
TestRoundtrip(0.12345e-20f);
TestRoundtrip(0.123456e-20f);
TestRoundtrip(0.1234567e-20f);
TestRoundtrip(0.12345678e-20f);
}
TEST(MarshallingTest, TestDoubleRoundTrip) {
TestRoundtrip(0.1);
TestRoundtrip(0.12);
TestRoundtrip(0.123);
TestRoundtrip(0.1234);
TestRoundtrip(0.12345);
TestRoundtrip(0.123456);
TestRoundtrip(0.1234567);
TestRoundtrip(0.12345678);
TestRoundtrip(0.123456789);
TestRoundtrip(0.1234567891);
TestRoundtrip(0.12345678912);
TestRoundtrip(0.123456789123);
TestRoundtrip(0.1234567891234);
TestRoundtrip(0.12345678912345);
TestRoundtrip(0.123456789123456);
TestRoundtrip(0.1234567891234567);
TestRoundtrip(0.12345678912345678);
TestRoundtrip(0.1e50);
TestRoundtrip(0.12e50);
TestRoundtrip(0.123e50);
TestRoundtrip(0.1234e50);
TestRoundtrip(0.12345e50);
TestRoundtrip(0.123456e50);
TestRoundtrip(0.1234567e50);
TestRoundtrip(0.12345678e50);
TestRoundtrip(0.123456789e50);
TestRoundtrip(0.1234567891e50);
TestRoundtrip(0.12345678912e50);
TestRoundtrip(0.123456789123e50);
TestRoundtrip(0.1234567891234e50);
TestRoundtrip(0.12345678912345e50);
TestRoundtrip(0.123456789123456e50);
TestRoundtrip(0.1234567891234567e50);
TestRoundtrip(0.12345678912345678e50);
TestRoundtrip(0.1e-50);
TestRoundtrip(0.12e-50);
TestRoundtrip(0.123e-50);
TestRoundtrip(0.1234e-50);
TestRoundtrip(0.12345e-50);
TestRoundtrip(0.123456e-50);
TestRoundtrip(0.1234567e-50);
TestRoundtrip(0.12345678e-50);
TestRoundtrip(0.123456789e-50);
TestRoundtrip(0.1234567891e-50);
TestRoundtrip(0.12345678912e-50);
TestRoundtrip(0.123456789123e-50);
TestRoundtrip(0.1234567891234e-50);
TestRoundtrip(0.12345678912345e-50);
TestRoundtrip(0.123456789123456e-50);
TestRoundtrip(0.1234567891234567e-50);
TestRoundtrip(0.12345678912345678e-50);
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/parse.h"
#include <stdlib.h>
#include <fstream>
#include <iostream>
#include <tuple>
#ifdef _WIN32
#include <windows.h>
#endif
#include "absl/flags/flag.h"
#include "absl/flags/internal/program_name.h"
#include "absl/flags/internal/registry.h"
#include "absl/flags/internal/usage.h"
#include "absl/flags/usage_config.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/strip.h"
#include "absl/synchronization/mutex.h"
// --------------------------------------------------------------------
namespace absl {
namespace flags_internal {
namespace {
ABSL_CONST_INIT absl::Mutex processing_checks_guard(absl::kConstInit);
ABSL_CONST_INIT bool flagfile_needs_processing
GUARDED_BY(processing_checks_guard) = false;
ABSL_CONST_INIT bool fromenv_needs_processing
GUARDED_BY(processing_checks_guard) = false;
ABSL_CONST_INIT bool tryfromenv_needs_processing
GUARDED_BY(processing_checks_guard) = false;
} // namespace
} // namespace flags_internal
} // namespace absl
ABSL_FLAG(std::vector<std::string>, flagfile, {},
"comma-separated list of files to load flags from")
.OnUpdate([]() {
if (absl::GetFlag(FLAGS_flagfile).empty()) return;
absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
// Setting this flag twice before it is handled most likely an internal
// error and should be reviewed by developers.
if (absl::flags_internal::flagfile_needs_processing) {
ABSL_INTERNAL_LOG(WARNING, "flagfile set twice before it is handled");
}
absl::flags_internal::flagfile_needs_processing = true;
});
ABSL_FLAG(std::vector<std::string>, fromenv, {},
"comma-separated list of flags to set from the environment"
" [use 'export FLAGS_flag1=value']")
.OnUpdate([]() {
if (absl::GetFlag(FLAGS_fromenv).empty()) return;
absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
// Setting this flag twice before it is handled most likely an internal
// error and should be reviewed by developers.
if (absl::flags_internal::fromenv_needs_processing) {
ABSL_INTERNAL_LOG(WARNING, "fromenv set twice before it is handled.");
}
absl::flags_internal::fromenv_needs_processing = true;
});
ABSL_FLAG(std::vector<std::string>, tryfromenv, {},
"comma-separated list of flags to try to set from the environment if "
"present")
.OnUpdate([]() {
if (absl::GetFlag(FLAGS_tryfromenv).empty()) return;
absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
// Setting this flag twice before it is handled most likely an internal
// error and should be reviewed by developers.
if (absl::flags_internal::tryfromenv_needs_processing) {
ABSL_INTERNAL_LOG(WARNING,
"tryfromenv set twice before it is handled.");
}
absl::flags_internal::tryfromenv_needs_processing = true;
});
ABSL_FLAG(std::vector<std::string>, undefok, {},
"comma-separated list of flag names that it is okay to specify "
"on the command line even if the program does not define a flag "
"with that name");
namespace absl {
namespace flags_internal {
namespace {
class ArgsList {
public:
ArgsList() : next_arg_(0) {}
ArgsList(int argc, char* argv[]) : args_(argv, argv + argc), next_arg_(0) {}
explicit ArgsList(const std::vector<std::string>& args)
: args_(args), next_arg_(0) {}
// Returns success status: true if parsing successful, false otherwise.
bool ReadFromFlagfile(const std::string& flag_file_name);
int Size() const { return args_.size() - next_arg_; }
int FrontIndex() const { return next_arg_; }
absl::string_view Front() const { return args_[next_arg_]; }
void PopFront() { next_arg_++; }
private:
std::vector<std::string> args_;
int next_arg_;
};
bool ArgsList::ReadFromFlagfile(const std::string& flag_file_name) {
std::ifstream flag_file(flag_file_name);
if (!flag_file) {
flags_internal::ReportUsageError(
absl::StrCat("Can't open flagfile ", flag_file_name), true);
return false;
}
// This argument represents fake argv[0], which should be present in all arg
// lists.
args_.push_back("");
std::string line;
bool success = true;
while (std::getline(flag_file, line)) {
absl::string_view stripped = absl::StripLeadingAsciiWhitespace(line);
if (stripped.empty() || stripped[0] == '#') {
// Comment or empty line; just ignore.
continue;
}
if (stripped[0] == '-') {
if (stripped == "--") {
flags_internal::ReportUsageError(
"Flagfile can't contain position arguments or --", true);
success = false;
break;
}
args_.push_back(std::string(stripped));
continue;
}
flags_internal::ReportUsageError(
absl::StrCat("Unexpected line in the flagfile ", flag_file_name, ": ",
line),
true);
success = false;
}
return success;
}
// --------------------------------------------------------------------
// Reads the environment variable with name `name` and stores results in
// `value`. If variable is not present in environment returns false, otherwise
// returns true.
bool GetEnvVar(const char* var_name, std::string* var_value) {
#ifdef _WIN32
char buf[1024];
auto get_res = GetEnvironmentVariableA(var_name, buf, sizeof(buf));
if (get_res >= sizeof(buf)) {
return "";
}
if (get_res == 0) {
return false;
}
*var_value = std::string(buf, get_res);
#else
const char* val = ::getenv(var_name);
if (val == nullptr) {
return false;
}
*var_value = val;
#endif
return true;
}
// --------------------------------------------------------------------
// Returns:
// Flag name or empty if arg= --
// Flag value after = in --flag=value (empty if --foo)
// "Is empty value" status. True if arg= --foo=, false otherwise. This is
// required to separate --foo from --foo=.
// For example:
// arg return values
// "--foo=bar" -> {"foo", "bar", false}.
// "--foo" -> {"foo", "", false}.
// "--foo=" -> {"foo", "", true}.
std::tuple<absl::string_view, absl::string_view, bool> SplitNameAndValue(
absl::string_view arg) {
// Allow -foo and --foo
absl::ConsumePrefix(&arg, "-");
if (arg.empty()) {
return std::make_tuple("", "", false);
}
auto equal_sign_pos = arg.find("=");
absl::string_view flag_name = arg.substr(0, equal_sign_pos);
absl::string_view value;
bool is_empty_value = false;
if (equal_sign_pos != absl::string_view::npos) {
value = arg.substr(equal_sign_pos + 1);
is_empty_value = value.empty();
}
return std::make_tuple(flag_name, value, is_empty_value);
}
// --------------------------------------------------------------------
// Returns:
// found flag or nullptr
// is negative in case of --nofoo
std::tuple<CommandLineFlag*, bool> LocateFlag(absl::string_view flag_name) {
CommandLineFlag* flag = flags_internal::FindCommandLineFlag(flag_name);
bool is_negative = false;
if (!flag && absl::ConsumePrefix(&flag_name, "no")) {
flag = flags_internal::FindCommandLineFlag(flag_name);
is_negative = true;
}
return std::make_tuple(flag, is_negative);
}
// --------------------------------------------------------------------
// Verify that default values of typed flags must be convertible to string and
// back.
void CheckDefaultValuesParsingRoundtrip() {
#ifndef NDEBUG
flags_internal::ForEachFlag([&](CommandLineFlag* flag) {
if (flag->IsRetired()) return;
#define IGNORE_TYPE(T) \
if (flag->IsOfType<T>()) return;
ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(IGNORE_TYPE)
IGNORE_TYPE(std::string)
IGNORE_TYPE(std::vector<std::string>)
#undef IGNORE_TYPE
absl::MutexLock lock(InitFlagIfNecessary(flag));
std::string v = flag->DefaultValue();
void* dst = Clone(flag->op, flag->def);
std::string error;
if (!flags_internal::Parse(flag->marshalling_op, v, dst, &error)) {
ABSL_INTERNAL_LOG(
FATAL,
absl::StrCat("Flag ", flag->Name(), " (from ", flag->Filename(),
"): std::string form of default value '", v,
"' could not be parsed; error=", error));
}
// We do not compare dst to def since parsing/unparsing may make
// small changes, e.g., precision loss for floating point types.
Delete(flag->op, dst);
});
#endif
}
// --------------------------------------------------------------------
// Returns success status, which is true if we successfully read all flag files,
// in which case new ArgLists are appended to the input_args in a reverse order
// of file names in the input flagfiles list. This order ensures that flags from
// the first flagfile in the input list are processed before the second flagfile
// etc.
bool ReadFlagfiles(const std::vector<std::string>& flagfiles,
std::vector<ArgsList>* input_args) {
bool success = true;
for (auto it = flagfiles.rbegin(); it != flagfiles.rend(); ++it) {
ArgsList al;
if (al.ReadFromFlagfile(*it)) {
input_args->push_back(al);
} else {
success = false;
}
}
return success;
}
// Returns success status, which is true if were able to locate all environment
// variables correctly or if fail_on_absent_in_env is false. The environment
// variable names are expected to be of the form `FLAGS_<flag_name>`, where
// `flag_name` is a string from the input flag_names list. If successful we
// append a single ArgList at the end of the input_args.
bool ReadFlagsFromEnv(const std::vector<std::string>& flag_names,
std::vector<ArgsList>* input_args,
bool fail_on_absent_in_env) {
bool success = true;
std::vector<std::string> args;
// This argument represents fake argv[0], which should be present in all arg
// lists.
args.push_back("");
for (const auto& flag_name : flag_names) {
// Avoid infinite recursion.
if (flag_name == "fromenv" || flag_name == "tryfromenv") {
flags_internal::ReportUsageError(
absl::StrCat("Infinite recursion on flag ", flag_name), true);
success = false;
continue;
}
const std::string envname = absl::StrCat("FLAGS_", flag_name);
std::string envval;
if (!GetEnvVar(envname.c_str(), &envval)) {
if (fail_on_absent_in_env) {
flags_internal::ReportUsageError(
absl::StrCat(envname, " not found in environment"), true);
success = false;
}
continue;
}
args.push_back(absl::StrCat("--", flag_name, "=", envval));
}
if (success) {
input_args->emplace_back(args);
}
return success;
}
// --------------------------------------------------------------------
// Returns success status, which is true if were able to handle all generator
// flags (flagfile, fromenv, tryfromemv) successfully.
bool HandleGeneratorFlags(std::vector<ArgsList>* input_args,
std::vector<std::string>* flagfile_value) {
bool success = true;
absl::MutexLock l(&flags_internal::processing_checks_guard);
// flagfile could have been set either on a command line or
// programmatically before invoking ParseCommandLine. Note that we do not
// actually process arguments specified in the flagfile, but instead
// create a secondary arguments list to be processed along with the rest
// of the comamnd line arguments. Since we always the process most recently
// created list of arguments first, this will result in flagfile argument
// being processed before any other argument in the command line. If
// FLAGS_flagfile contains more than one file name we create multiple new
// levels of arguments in a reverse order of file names. Thus we always
// process arguments from first file before arguments containing in a
// second file, etc. If flagfile contains another
// --flagfile inside of it, it will produce new level of arguments and
// processed before the rest of the flagfile. We are also collecting all
// flagfiles set on original command line. Unlike the rest of the flags,
// this flag can be set multiple times and is expected to be handled
// multiple times. We are collecting them all into a single list and set
// the value of FLAGS_flagfile to that value at the end of the parsing.
if (flags_internal::flagfile_needs_processing) {
auto flagfiles = absl::GetFlag(FLAGS_flagfile);
if (input_args->size() == 1) {
flagfile_value->insert(flagfile_value->end(), flagfiles.begin(),
flagfiles.end());
}
success &= ReadFlagfiles(flagfiles, input_args);
flags_internal::flagfile_needs_processing = false;
}
// Similar to flagfile fromenv/tryfromemv can be set both
// programmatically and at runtime on a command line. Unlike flagfile these
// can't be recursive.
if (flags_internal::fromenv_needs_processing) {
auto flags_list = absl::GetFlag(FLAGS_fromenv);
success &= ReadFlagsFromEnv(flags_list, input_args, true);
flags_internal::fromenv_needs_processing = false;
}
if (flags_internal::tryfromenv_needs_processing) {
auto flags_list = absl::GetFlag(FLAGS_tryfromenv);
success &= ReadFlagsFromEnv(flags_list, input_args, false);
flags_internal::tryfromenv_needs_processing = false;
}
return success;
}
// --------------------------------------------------------------------
void ResetGeneratorFlags(const std::vector<std::string>& flagfile_value) {
// Setting flagfile to the value which collates all the values set on a
// command line and programmatically. So if command line looked like
// --flagfile=f1 --flagfile=f2 the final value of the FLAGS_flagfile flag is
// going to be {"f1", "f2"}
if (!flagfile_value.empty()) {
absl::SetFlag(&FLAGS_flagfile, flagfile_value);
absl::MutexLock l(&flags_internal::processing_checks_guard);
flags_internal::flagfile_needs_processing = false;
}
// fromenv/tryfromenv are set to <undefined> value.
if (!absl::GetFlag(FLAGS_fromenv).empty()) {
absl::SetFlag(&FLAGS_fromenv, {});
}
if (!absl::GetFlag(FLAGS_tryfromenv).empty()) {
absl::SetFlag(&FLAGS_tryfromenv, {});
}
absl::MutexLock l(&flags_internal::processing_checks_guard);
flags_internal::fromenv_needs_processing = false;
flags_internal::tryfromenv_needs_processing = false;
}
// --------------------------------------------------------------------
// Returns:
// success status
// deduced value
// We are also mutating curr_list in case if we need to get a hold of next
// argument in the input.
std::tuple<bool, absl::string_view> DeduceFlagValue(const CommandLineFlag& flag,
absl::string_view value,
bool is_negative,
bool is_empty_value,
ArgsList* curr_list) {
// Value is either an argument suffix after `=` in "--foo=<value>"
// or separate argument in case of "--foo" "<value>".
// boolean flags have these forms:
// --foo
// --nofoo
// --foo=true
// --foo=false
// --nofoo=<value> is not supported
// --foo <value> is not supported
// non boolean flags have these forms:
// --foo=<value>
// --foo <value>
// --nofoo is not supported
if (flag.IsOfType<bool>()) {
if (value.empty()) {
if (is_empty_value) {
// "--bool_flag=" case
flags_internal::ReportUsageError(
absl::StrCat(
"Missing the value after assignment for the boolean flag '",
flag.Name(), "'"),
true);
return std::make_tuple(false, "");
}
// "--bool_flag" case
value = is_negative ? "0" : "1";
} else if (is_negative) {
// "--nobool_flag=Y" case
flags_internal::ReportUsageError(
absl::StrCat("Negative form with assignment is not valid for the "
"boolean flag '",
flag.Name(), "'"),
true);
return std::make_tuple(false, "");
}
} else if (is_negative) {
// "--noint_flag=1" case
flags_internal::ReportUsageError(
absl::StrCat("Negative form is not valid for the flag '", flag.Name(),
"'"),
true);
return std::make_tuple(false, "");
} else if (value.empty() && (!is_empty_value)) {
if (curr_list->Size() == 1) {
// "--int_flag" case
flags_internal::ReportUsageError(
absl::StrCat("Missing the value for the flag '", flag.Name(), "'"),
true);
return std::make_tuple(false, "");
}
// "--int_flag" "10" case
curr_list->PopFront();
value = curr_list->Front();
// Heuristic to detect the case where someone treats a std::string arg
// like a bool or just forgets to pass a value:
// --my_string_var --foo=bar
// We look for a flag of std::string type, whose value begins with a
// dash and corresponds to known flag or standalone --.
if (value[0] == '-' && flag.IsOfType<std::string>()) {
auto maybe_flag_name = std::get<0>(SplitNameAndValue(value.substr(1)));
if (maybe_flag_name.empty() ||
std::get<0>(LocateFlag(maybe_flag_name)) != nullptr) {
// "--string_flag" "--known_flag" case
ABSL_INTERNAL_LOG(
WARNING,
absl::StrCat("Did you really mean to set flag '", flag.Name(),
"' to the value '", value, "'?"));
}
}
}
return std::make_tuple(true, value);
}
// --------------------------------------------------------------------
bool CanIgnoreUndefinedFlag(absl::string_view flag_name) {
auto undefok = absl::GetFlag(FLAGS_undefok);
if (std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
return true;
}
if (absl::ConsumePrefix(&flag_name, "no") &&
std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
return true;
}
return false;
}
} // namespace
// --------------------------------------------------------------------
std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
ArgvListAction arg_list_act,
UsageFlagsAction usage_flag_act,
OnUndefinedFlag on_undef_flag) {
ABSL_INTERNAL_CHECK(argc > 0, "Missing argv[0]");
// This routine does not return anything since we abort on failure.
CheckDefaultValuesParsingRoundtrip();
std::vector<std::string> flagfile_value;
std::vector<ArgsList> input_args;
input_args.push_back(ArgsList(argc, argv));
std::vector<char*> output_args;
std::vector<char*> positional_args;
output_args.reserve(argc);
// This is the list of undefined flags. The element of the list is the pair
// consisting of boolean indicating if flag came from command line (vs from
// some flag file we've read) and flag name.
// TODO(rogeeff): Eliminate the first element in the pair after cleanup.
std::vector<std::pair<bool, std::string>> undefined_flag_names;
// Set program invocation name if it is not set before.
if (ProgramInvocationName() == "UNKNOWN") {
flags_internal::SetProgramInvocationName(argv[0]);
}
output_args.push_back(argv[0]);
// Iterate through the list of the input arguments. First level are arguments
// originated from argc/argv. Following levels are arguments originated from
// recursive parsing of flagfile(s).
bool success = true;
while (!input_args.empty()) {
// 10. First we process the built-in generator flags.
success &= HandleGeneratorFlags(&input_args, &flagfile_value);
// 30. Select top-most (most recent) arguments list. If it is empty drop it
// and re-try.
ArgsList& curr_list = input_args.back();
curr_list.PopFront();
if (curr_list.Size() == 0) {
input_args.pop_back();
continue;
}
// 40. Pick up the front remaining argument in the current list. If current
// stack of argument lists contains only one element - we are processing an
// argument from the original argv.
absl::string_view arg(curr_list.Front());
bool arg_from_argv = input_args.size() == 1;
// 50. If argument does not start with - or is just "-" - this is
// positional argument.
if (!absl::ConsumePrefix(&arg, "-") || arg.empty()) {
ABSL_INTERNAL_CHECK(arg_from_argv,
"Flagfile cannot contain positional argument");
positional_args.push_back(argv[curr_list.FrontIndex()]);
continue;
}
if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs)) {
output_args.push_back(argv[curr_list.FrontIndex()]);
}
// 60. Split the current argument on '=' to figure out the argument
// name and value. If flag name is empty it means we've got "--". value
// can be empty either if there were no '=' in argument std::string at all or
// an argument looked like "--foo=". In a latter case is_empty_value is
// true.
absl::string_view flag_name;
absl::string_view value;
bool is_empty_value = false;
std::tie(flag_name, value, is_empty_value) = SplitNameAndValue(arg);
// 70. "--" alone means what it does for GNU: stop flags parsing. We do
// not support positional arguments in flagfiles, so we just drop them.
if (flag_name.empty()) {
ABSL_INTERNAL_CHECK(arg_from_argv,
"Flagfile cannot contain positional argument");
curr_list.PopFront();
break;
}
// 80. Locate the flag based on flag name. Handle both --foo and --nofoo
CommandLineFlag* flag = nullptr;
bool is_negative = false;
std::tie(flag, is_negative) = LocateFlag(flag_name);
if (flag == nullptr) {
if (on_undef_flag != OnUndefinedFlag::kIgnoreUndefined) {
undefined_flag_names.emplace_back(arg_from_argv,
std::string(flag_name));
}
continue;
}
// 90. Deduce flag's value (from this or next argument)
auto curr_index = curr_list.FrontIndex();
bool value_success = true;
std::tie(value_success, value) =
DeduceFlagValue(*flag, value, is_negative, is_empty_value, &curr_list);
success &= value_success;
// If above call consumed an argument, it was a standalone value
if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs) &&
(curr_index != curr_list.FrontIndex())) {
output_args.push_back(argv[curr_list.FrontIndex()]);
}
// 100. Set the located flag to a new new value, unless it is retired.
// Setting retired flag fails, but we ignoring it here.
if (flag->IsRetired()) continue;
std::string error;
if (!flag->SetFromString(value, SET_FLAGS_VALUE, kCommandLine, &error)) {
flags_internal::ReportUsageError(error, true);
success = false;
}
}
for (const auto& flag_name : undefined_flag_names) {
if (CanIgnoreUndefinedFlag(flag_name.second)) continue;
flags_internal::ReportUsageError(
absl::StrCat("Unknown command line flag '", flag_name.second, "'"),
true);
success = false;
}
#if ABSL_FLAGS_STRIP_NAMES
if (!success) {
flags_internal::ReportUsageError(
"NOTE: command line flags are disabled in this build", true);
}
#endif
if (!success) {
flags_internal::HandleUsageFlags(std::cout);
std::exit(1);
}
if (usage_flag_act == UsageFlagsAction::kHandleUsage) {
int exit_code = flags_internal::HandleUsageFlags(std::cout);
if (exit_code != -1) {
std::exit(exit_code);
}
}
ResetGeneratorFlags(flagfile_value);
// Reinstate positional args which were intermixed with flags in the arguments
// list.
for (auto arg : positional_args) {
output_args.push_back(arg);
}
// All the remaining arguments are positional.
if (!input_args.empty()) {
for (int arg_index = input_args.back().FrontIndex(); arg_index < argc;
++arg_index) {
output_args.push_back(argv[arg_index]);
}
}
return output_args;
}
} // namespace flags_internal
// --------------------------------------------------------------------
std::vector<char*> ParseCommandLine(int argc, char* argv[]) {
return flags_internal::ParseCommandLineImpl(
argc, argv, flags_internal::ArgvListAction::kRemoveParsedArgs,
flags_internal::UsageFlagsAction::kHandleUsage,
flags_internal::OnUndefinedFlag::kAbortIfUndefined);
}
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: parse.h
// -----------------------------------------------------------------------------
//
// This file defines the main parsing function for Abseil flags:
// `absl::ParseCommandLine()`.
#ifndef ABSL_FLAGS_PARSE_H_
#define ABSL_FLAGS_PARSE_H_
#include <string>
#include <vector>
#include "absl/flags/internal/parse.h"
namespace absl {
// ParseCommandLine()
//
// Parses the set of command-line arguments passed in the `argc` (argument
// count) and `argv[]` (argument vector) parameters from `main()`, assigning
// values to any defined Abseil flags. (Any arguments passed after the
// flag-terminating delimiter (`--`) are treated as positional arguments and
// ignored.)
//
// Any command-line flags (and arguments to those flags) are parsed into Abseil
// Flag values, if those flags are defined. Any undefined flags will either
// return an error, or be ignored if that flag is designated using `undefok` to
// indicate "undefined is OK."
//
// Any command-line positional arguments not part of any command-line flag (or
// arguments to a flag) are returned in a vector, with the program invocation
// name at position 0 of that vector. (Note that this includes positional
// arguments after the flag-terminating delimiter `--`.)
//
// After all flags and flag arguments are parsed, this function looks for any
// built-in usage flags (e.g. `--help`), and if any were specified, it reports
// help messages and then exits the program.
std::vector<char*> ParseCommandLine(int argc, char* argv[]);
} // namespace absl
#endif // ABSL_FLAGS_PARSE_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/parse.h"
#include <fstream>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/scoped_set_env.h"
#include "absl/flags/flag.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/substitute.h"
#include "absl/types/span.h"
#ifdef _WIN32
#include <windows.h>
#endif
namespace {
using absl::base_internal::ScopedSetEnv;
struct UDT {
UDT() = default;
UDT(const UDT&) = default;
UDT(int v) : value(v) {} // NOLINT
int value;
};
bool AbslParseFlag(absl::string_view in, UDT* udt, std::string* err) {
if (in == "A") {
udt->value = 1;
return true;
}
if (in == "AAA") {
udt->value = 10;
return true;
}
*err = "Use values A, AAA instead";
return false;
}
std::string AbslUnparseFlag(const UDT& udt) {
return udt.value == 1 ? "A" : "AAA";
}
std::string GetTestTmpDirEnvVar(const char* const env_var_name) {
#ifdef _WIN32
char buf[MAX_PATH];
auto get_res = GetEnvironmentVariableA(env_var_name, buf, sizeof(buf));
if (get_res >= sizeof(buf) || get_res == 0) {
return "";
}
return std::string(buf, get_res);
#else
const char* val = ::getenv(env_var_name);
if (val == nullptr) {
return "";
}
return val;
#endif
}
const std::string& GetTestTempDir() {
static std::string* temp_dir_name = []() -> std::string* {
std::string* res = new std::string(GetTestTmpDirEnvVar("TEST_TMPDIR"));
if (res->empty()) {
*res = GetTestTmpDirEnvVar("TMPDIR");
}
if (res->empty()) {
#ifdef _WIN32
char temp_path_buffer[MAX_PATH];
auto len = GetTempPathA(MAX_PATH, temp_path_buffer);
if (len < MAX_PATH && len != 0) {
std::string temp_dir_name = absl::StrCat(
temp_path_buffer, "\\parse_test.", GetCurrentProcessId());
if (CreateDirectoryA(temp_dir_name.c_str(), nullptr)) {
*res = temp_dir_name;
}
}
#else
char temp_dir_template[] = "/tmp/parse_test.XXXXXX";
if (auto* unique_name = ::mkdtemp(temp_dir_template)) {
*res = unique_name;
}
#endif
if (res->empty()) {
ABSL_INTERNAL_LOG(FATAL,
"Failed to make temporary directory for data files");
}
}
#ifdef _WIN32
*res += "\\";
#else
*res += "/";
#endif
return res;
}();
return *temp_dir_name;
}
struct FlagfileData {
const absl::string_view file_name;
const absl::Span<const char* const> file_lines;
};
// clang-format off
constexpr const char* const ff1_data[] = {
"# comment ",
" # comment ",
"",
" ",
"--int_flag=-1",
" --string_flag=q2w2 ",
" ## ",
" --double_flag=0.1",
"--bool_flag=Y "
};
constexpr const char* const ff2_data[] = {
"# Setting legacy flag",
"--legacy_int=1111",
"--legacy_bool",
"--nobool_flag",
"--legacy_str=aqsw",
"--int_flag=100",
" ## ============="
};
// clang-format on
// Builds flagfile flag in the flagfile_flag buffer and returns it. This
// function also creates a temporary flagfile based on FlagfileData input.
// We create a flagfile in a temporary directory with the name specified in
// FlagfileData and populate it with lines specifed in FlagfileData. If $0 is
// referenced in any of the lines in FlagfileData they are replaced with
// temporary directory location. This way we can test inclusion of one flagfile
// from another flagfile.
const char* GetFlagfileFlag(const std::vector<FlagfileData>& ffd,
std::string* flagfile_flag) {
*flagfile_flag = "--flagfile=";
absl::string_view separator;
for (const auto& flagfile_data : ffd) {
std::string flagfile_name =
absl::StrCat(GetTestTempDir(), flagfile_data.file_name);
std::ofstream flagfile_out(flagfile_name);
for (auto line : flagfile_data.file_lines) {
flagfile_out << absl::Substitute(line, GetTestTempDir()) << "\n";
}
absl::StrAppend(flagfile_flag, separator, flagfile_name);
separator = ",";
}
return flagfile_flag->c_str();
}
} // namespace
ABSL_FLAG(int, int_flag, 1, "");
ABSL_FLAG(double, double_flag, 1.1, "");
ABSL_FLAG(std::string, string_flag, "a", "");
ABSL_FLAG(bool, bool_flag, false, "");
ABSL_FLAG(UDT, udt_flag, -1, "");
ABSL_RETIRED_FLAG(int, legacy_int, 1, "");
ABSL_RETIRED_FLAG(bool, legacy_bool, false, "");
ABSL_RETIRED_FLAG(std::string, legacy_str, "l", "");
namespace {
namespace flags = absl::flags_internal;
using testing::ElementsAreArray;
class ParseTest : public testing::Test {
private:
flags::FlagSaver flag_saver_;
};
// --------------------------------------------------------------------
template <int N>
std::vector<char*> InvokeParse(const char* (&in_argv)[N]) {
return absl::ParseCommandLine(N, const_cast<char**>(in_argv));
}
// --------------------------------------------------------------------
template <int N>
void TestParse(const char* (&in_argv)[N], int int_flag_value,
double double_flag_val, absl::string_view string_flag_val,
bool bool_flag_val, int exp_position_args = 0) {
auto out_args = InvokeParse(in_argv);
EXPECT_EQ(out_args.size(), 1 + exp_position_args);
EXPECT_STREQ(out_args[0], "testbin");
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), int_flag_value);
EXPECT_NEAR(absl::GetFlag(FLAGS_double_flag), double_flag_val, 0.0001);
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), string_flag_val);
EXPECT_EQ(absl::GetFlag(FLAGS_bool_flag), bool_flag_val);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestEmptyArgv) {
const char* in_argv[] = {"testbin"};
auto out_args = InvokeParse(in_argv);
EXPECT_EQ(out_args.size(), 1);
EXPECT_STREQ(out_args[0], "testbin");
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidIntArg) {
const char* in_args1[] = {
"testbin",
"--int_flag=10",
};
TestParse(in_args1, 10, 1.1, "a", false);
const char* in_args2[] = {
"testbin",
"-int_flag=020",
};
TestParse(in_args2, 20, 1.1, "a", false);
const char* in_args3[] = {
"testbin",
"--int_flag",
"-30",
};
TestParse(in_args3, -30, 1.1, "a", false);
const char* in_args4[] = {
"testbin",
"-int_flag",
"0x21",
};
TestParse(in_args4, 33, 1.1, "a", false);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidDoubleArg) {
const char* in_args1[] = {
"testbin",
"--double_flag=2.3",
};
TestParse(in_args1, 1, 2.3, "a", false);
const char* in_args2[] = {
"testbin",
"--double_flag=0x1.2",
};
TestParse(in_args2, 1, 1.125, "a", false);
const char* in_args3[] = {
"testbin",
"--double_flag",
"99.7",
};
TestParse(in_args3, 1, 99.7, "a", false);
const char* in_args4[] = {
"testbin",
"--double_flag",
"0x20.1",
};
TestParse(in_args4, 1, 32.0625, "a", false);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidStringArg) {
const char* in_args1[] = {
"testbin",
"--string_flag=aqswde",
};
TestParse(in_args1, 1, 1.1, "aqswde", false);
const char* in_args2[] = {
"testbin",
"-string_flag=a=b=c",
};
TestParse(in_args2, 1, 1.1, "a=b=c", false);
const char* in_args3[] = {
"testbin",
"--string_flag",
"zaxscd",
};
TestParse(in_args3, 1, 1.1, "zaxscd", false);
const char* in_args4[] = {
"testbin",
"-string_flag",
"--int_flag",
};
TestParse(in_args4, 1, 1.1, "--int_flag", false);
const char* in_args5[] = {
"testbin",
"--string_flag",
"--no_a_flag=11",
};
TestParse(in_args5, 1, 1.1, "--no_a_flag=11", false);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidBoolArg) {
const char* in_args1[] = {
"testbin",
"--bool_flag",
};
TestParse(in_args1, 1, 1.1, "a", true);
const char* in_args2[] = {
"testbin",
"--nobool_flag",
};
TestParse(in_args2, 1, 1.1, "a", false);
const char* in_args3[] = {
"testbin",
"--bool_flag=true",
};
TestParse(in_args3, 1, 1.1, "a", true);
const char* in_args4[] = {
"testbin",
"-bool_flag=false",
};
TestParse(in_args4, 1, 1.1, "a", false);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidUDTArg) {
const char* in_args1[] = {
"testbin",
"--udt_flag=A",
};
InvokeParse(in_args1);
EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 1);
const char* in_args2[] = {"testbin", "--udt_flag", "AAA"};
InvokeParse(in_args2);
EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 10);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidMultipleArg) {
const char* in_args1[] = {
"testbin", "--bool_flag", "--int_flag=2",
"--double_flag=0.1", "--string_flag=asd",
};
TestParse(in_args1, 2, 0.1, "asd", true);
const char* in_args2[] = {
"testbin", "--string_flag=", "--nobool_flag", "--int_flag",
"-011", "--double_flag", "-1e-2",
};
TestParse(in_args2, -11, -0.01, "", false);
const char* in_args3[] = {
"testbin", "--int_flag", "-0", "--string_flag", "\"\"",
"--bool_flag=true", "--double_flag=1e18",
};
TestParse(in_args3, 0, 1e18, "\"\"", true);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestPositionalArgs) {
const char* in_args1[] = {
"testbin",
"p1",
"p2",
};
TestParse(in_args1, 1, 1.1, "a", false, 2);
auto out_args1 = InvokeParse(in_args1);
EXPECT_STREQ(out_args1[1], "p1");
EXPECT_STREQ(out_args1[2], "p2");
const char* in_args2[] = {
"testbin",
"--int_flag=2",
"p1",
};
TestParse(in_args2, 2, 1.1, "a", false, 1);
auto out_args2 = InvokeParse(in_args2);
EXPECT_STREQ(out_args2[1], "p1");
const char* in_args3[] = {"testbin", "p1", "--int_flag=3",
"p2", "--bool_flag", "true"};
TestParse(in_args3, 3, 1.1, "a", true, 3);
auto out_args3 = InvokeParse(in_args3);
EXPECT_STREQ(out_args3[1], "p1");
EXPECT_STREQ(out_args3[2], "p2");
EXPECT_STREQ(out_args3[3], "true");
const char* in_args4[] = {
"testbin",
"--",
"p1",
"p2",
};
TestParse(in_args4, 3, 1.1, "a", true, 2);
auto out_args4 = InvokeParse(in_args4);
EXPECT_STREQ(out_args4[1], "p1");
EXPECT_STREQ(out_args4[2], "p2");
const char* in_args5[] = {
"testbin", "p1", "--int_flag=4", "--", "--bool_flag", "false", "p2",
};
TestParse(in_args5, 4, 1.1, "a", true, 4);
auto out_args5 = InvokeParse(in_args5);
EXPECT_STREQ(out_args5[1], "p1");
EXPECT_STREQ(out_args5[2], "--bool_flag");
EXPECT_STREQ(out_args5[3], "false");
EXPECT_STREQ(out_args5[4], "p2");
}
// --------------------------------------------------------------------
using ParseDeathTest = ParseTest;
TEST_F(ParseDeathTest, TestUndefinedArg) {
const char* in_args1[] = {
"testbin",
"--undefined_flag",
};
EXPECT_DEATH(InvokeParse(in_args1),
"Unknown command line flag 'undefined_flag'");
const char* in_args2[] = {
"testbin",
"--noprefixed_flag",
};
EXPECT_DEATH(InvokeParse(in_args2),
"Unknown command line flag 'noprefixed_flag'");
const char* in_args3[] = {
"testbin",
"--Int_flag=1",
};
EXPECT_DEATH(InvokeParse(in_args3), "Unknown command line flag 'Int_flag'");
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestInvalidBoolFlagFormat) {
const char* in_args1[] = {
"testbin",
"--bool_flag=",
};
EXPECT_DEATH(
InvokeParse(in_args1),
"Missing the value after assignment for the boolean flag 'bool_flag'");
const char* in_args2[] = {
"testbin",
"--nobool_flag=true",
};
EXPECT_DEATH(InvokeParse(in_args2),
"Negative form with assignment is not valid for the boolean "
"flag 'bool_flag'");
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestInvalidNonBoolFlagFormat) {
const char* in_args1[] = {
"testbin",
"--nostring_flag",
};
EXPECT_DEATH(InvokeParse(in_args1),
"Negative form is not valid for the flag 'string_flag'");
const char* in_args2[] = {
"testbin",
"--int_flag",
};
EXPECT_DEATH(InvokeParse(in_args2),
"Missing the value for the flag 'int_flag'");
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestInvalidUDTFlagFormat) {
const char* in_args1[] = {
"testbin",
"--udt_flag=1",
};
EXPECT_DEATH(InvokeParse(in_args1),
"Illegal value '1' specified for flag 'udt_flag'; Use values A, "
"AAA instead");
const char* in_args2[] = {
"testbin",
"--udt_flag",
"AA",
};
EXPECT_DEATH(InvokeParse(in_args2),
"Illegal value 'AA' specified for flag 'udt_flag'; Use values "
"A, AAA instead");
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestLegacyFlags) {
const char* in_args1[] = {
"testbin",
"--legacy_int=11",
};
TestParse(in_args1, 1, 1.1, "a", false);
const char* in_args2[] = {
"testbin",
"--legacy_bool",
};
TestParse(in_args2, 1, 1.1, "a", false);
const char* in_args3[] = {
"testbin", "--legacy_int", "22", "--int_flag=2",
"--legacy_bool", "true", "--legacy_str", "--string_flag=qwe",
};
TestParse(in_args3, 2, 1.1, "a", false, 1);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestSimpleValidFlagfile) {
std::string flagfile_flag;
const char* in_args1[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
&flagfile_flag),
};
TestParse(in_args1, -1, 0.1, "q2w2 ", true);
const char* in_args2[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)}},
&flagfile_flag),
};
TestParse(in_args2, 100, 0.1, "q2w2 ", false);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestValidMultiFlagfile) {
std::string flagfile_flag;
const char* in_args1[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)},
{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
&flagfile_flag),
};
TestParse(in_args1, -1, 0.1, "q2w2 ", true);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestFlagfileMixedWithRegularFlags) {
std::string flagfile_flag;
const char* in_args1[] = {
"testbin", "--int_flag=3",
GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
&flagfile_flag),
"-double_flag=0.2"};
TestParse(in_args1, -1, 0.2, "q2w2 ", true);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestFlagfileInFlagfile) {
std::string flagfile_flag;
constexpr const char* const ff3_data[] = {
"--flagfile=$0/parse_test.ff1",
"--flagfile=$0/parse_test.ff2",
};
const char* in_args1[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff3", absl::MakeConstSpan(ff3_data)}},
&flagfile_flag),
};
TestParse(in_args1, 100, 0.1, "q2w2 ", false);
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestInvalidFlagfiles) {
std::string flagfile_flag;
constexpr const char* const ff4_data[] = {
"--unknown_flag=10"
};
const char* in_args1[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff4",
absl::MakeConstSpan(ff4_data)}}, &flagfile_flag),
};
EXPECT_DEATH(InvokeParse(in_args1),
"Unknown command line flag 'unknown_flag'");
constexpr const char* const ff5_data[] = {
"--int_flag 10",
};
const char* in_args2[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff5",
absl::MakeConstSpan(ff5_data)}}, &flagfile_flag),
};
EXPECT_DEATH(InvokeParse(in_args2),
"Unknown command line flag 'int_flag 10'");
constexpr const char* const ff6_data[] = {
"--int_flag=10", "--", "arg1", "arg2", "arg3",
};
const char* in_args3[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff6", absl::MakeConstSpan(ff6_data)}},
&flagfile_flag),
};
EXPECT_DEATH(InvokeParse(in_args3),
"Flagfile can't contain position arguments or --");
const char* in_args4[] = {
"testbin",
"--flagfile=invalid_flag_file",
};
EXPECT_DEATH(InvokeParse(in_args4), "Can't open flagfile invalid_flag_file");
constexpr const char* const ff7_data[] = {
"--int_flag=10",
"*bin*",
"--str_flag=aqsw",
};
const char* in_args5[] = {
"testbin",
GetFlagfileFlag({{"parse_test.ff7", absl::MakeConstSpan(ff7_data)}},
&flagfile_flag),
};
EXPECT_DEATH(InvokeParse(in_args5),
"Unexpected line in the flagfile .*: \\*bin\\*");
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestReadingRequiredFlagsFromEnv) {
const char* in_args1[] = {"testbin",
"--fromenv=int_flag,bool_flag,string_flag"};
ScopedSetEnv set_int_flag("FLAGS_int_flag", "33");
ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "True");
ScopedSetEnv set_string_flag("FLAGS_string_flag", "AQ12");
TestParse(in_args1, 33, 1.1, "AQ12", true);
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestReadingUnsetRequiredFlagsFromEnv) {
const char* in_args1[] = {"testbin", "--fromenv=int_flag"};
EXPECT_DEATH(InvokeParse(in_args1),
"FLAGS_int_flag not found in environment");
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestRecursiveFlagsFromEnv) {
const char* in_args1[] = {"testbin", "--fromenv=tryfromenv"};
ScopedSetEnv set_tryfromenv("FLAGS_tryfromenv", "int_flag");
EXPECT_DEATH(InvokeParse(in_args1), "Infinite recursion on flag tryfromenv");
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestReadingOptionalFlagsFromEnv) {
const char* in_args1[] = {
"testbin", "--tryfromenv=int_flag,bool_flag,string_flag,other_flag"};
ScopedSetEnv set_int_flag("FLAGS_int_flag", "17");
ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "Y");
TestParse(in_args1, 17, 1.1, "a", true);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestReadingFlagsFromEnvMoxedWithRegularFlags) {
const char* in_args1[] = {
"testbin",
"--bool_flag=T",
"--tryfromenv=int_flag,bool_flag",
"--int_flag=-21",
};
ScopedSetEnv set_int_flag("FLAGS_int_flag", "-15");
ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "F");
TestParse(in_args1, -21, 1.1, "a", false);
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestKeepParsedArgs) {
const char* in_args1[] = {
"testbin", "arg1", "--bool_flag",
"--int_flag=211", "arg2", "--double_flag=1.1",
"--string_flag", "asd", "--",
"arg3", "arg4",
};
auto out_args1 = InvokeParse(in_args1);
EXPECT_THAT(
out_args1,
ElementsAreArray({absl::string_view("testbin"), absl::string_view("arg1"),
absl::string_view("arg2"), absl::string_view("arg3"),
absl::string_view("arg4")}));
auto out_args2 = flags::ParseCommandLineImpl(
11, const_cast<char**>(in_args1), flags::ArgvListAction::kKeepParsedArgs,
flags::UsageFlagsAction::kHandleUsage,
flags::OnUndefinedFlag::kAbortIfUndefined);
EXPECT_THAT(
out_args2,
ElementsAreArray({absl::string_view("testbin"),
absl::string_view("--bool_flag"),
absl::string_view("--int_flag=211"),
absl::string_view("--double_flag=1.1"),
absl::string_view("--string_flag"),
absl::string_view("asd"), absl::string_view("--"),
absl::string_view("arg1"), absl::string_view("arg2"),
absl::string_view("arg3"), absl::string_view("arg4")}));
}
// --------------------------------------------------------------------
TEST_F(ParseTest, TestIgnoreUndefinedFlags) {
const char* in_args1[] = {
"testbin",
"arg1",
"--undef_flag=aa",
"--int_flag=21",
};
auto out_args1 = flags::ParseCommandLineImpl(
4, const_cast<char**>(in_args1), flags::ArgvListAction::kRemoveParsedArgs,
flags::UsageFlagsAction::kHandleUsage,
flags::OnUndefinedFlag::kIgnoreUndefined);
EXPECT_THAT(out_args1, ElementsAreArray({absl::string_view("testbin"),
absl::string_view("arg1")}));
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 21);
const char* in_args2[] = {
"testbin",
"arg1",
"--undef_flag=aa",
"--string_flag=AA",
};
auto out_args2 = flags::ParseCommandLineImpl(
4, const_cast<char**>(in_args2), flags::ArgvListAction::kKeepParsedArgs,
flags::UsageFlagsAction::kHandleUsage,
flags::OnUndefinedFlag::kIgnoreUndefined);
EXPECT_THAT(
out_args2,
ElementsAreArray(
{absl::string_view("testbin"), absl::string_view("--undef_flag=aa"),
absl::string_view("--string_flag=AA"), absl::string_view("arg1")}));
EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "AA");
}
// --------------------------------------------------------------------
TEST_F(ParseDeathTest, TestHelpFlagHandling) {
const char* in_args1[] = {
"testbin",
"--help",
};
EXPECT_EXIT(InvokeParse(in_args1), testing::ExitedWithCode(1), "");
const char* in_args2[] = {
"testbin",
"--help",
"--int_flag=3",
};
auto out_args2 = flags::ParseCommandLineImpl(
3, const_cast<char**>(in_args2), flags::ArgvListAction::kRemoveParsedArgs,
flags::UsageFlagsAction::kIgnoreUsage,
flags::OnUndefinedFlag::kAbortIfUndefined);
EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 3);
}
} // namespace

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/usage_config.h"
#include <iostream>
#include <memory>
#include "absl/base/attributes.h"
#include "absl/flags/internal/path_util.h"
#include "absl/flags/internal/program_name.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/strip.h"
#include "absl/synchronization/mutex.h"
extern "C" {
// Additional report of fatal usage error message before we std::exit. Error is
// fatal if is_fatal argument to ReportUsageError is true.
ABSL_ATTRIBUTE_WEAK void AbslInternalReportFatalUsageError(absl::string_view) {}
} // extern "C"
namespace absl {
namespace flags_internal {
namespace {
// --------------------------------------------------------------------
// Returns true if flags defined in the filename should be reported with
// -helpshort flag.
bool ContainsHelpshortFlags(absl::string_view filename) {
// By default we only want flags in binary's main. We expect the main
// routine to reside in <program>.cc or <program>-main.cc or
// <program>_main.cc, where the <program> is the name of the binary.
auto suffix = flags_internal::Basename(filename);
if (!absl::ConsumePrefix(&suffix,
flags_internal::ShortProgramInvocationName()))
return false;
return absl::StartsWith(suffix, ".") || absl::StartsWith(suffix, "-main.") ||
absl::StartsWith(suffix, "_main.");
}
// --------------------------------------------------------------------
// Returns true if flags defined in the filename should be reported with
// -helppackage flag.
bool ContainsHelppackageFlags(absl::string_view filename) {
// TODO(rogeeff): implement properly when registry is available.
return ContainsHelpshortFlags(filename);
}
// --------------------------------------------------------------------
// Generates program version information into supplied output.
std::string VersionString() {
std::string version_str(flags_internal::ShortProgramInvocationName());
version_str += "\n";
#if !defined(NDEBUG)
version_str += "Debug build (NDEBUG not #defined)\n";
#endif
return version_str;
}
// --------------------------------------------------------------------
// Normalizes the filename specific to the build system/filesystem used.
std::string NormalizeFilename(absl::string_view filename) {
// Skip any leading slashes
auto pos = filename.find_first_not_of("\\/");
if (pos == absl::string_view::npos) return "";
filename.remove_prefix(pos);
return std::string(filename);
}
// --------------------------------------------------------------------
ABSL_CONST_INIT absl::Mutex custom_usage_config_guard(absl::kConstInit);
ABSL_CONST_INIT FlagsUsageConfig* custom_usage_config
GUARDED_BY(custom_usage_config_guard) = nullptr;
} // namespace
FlagsUsageConfig GetUsageConfig() {
absl::MutexLock l(&custom_usage_config_guard);
if (custom_usage_config) return *custom_usage_config;
FlagsUsageConfig default_config;
default_config.contains_helpshort_flags = &ContainsHelpshortFlags;
default_config.contains_help_flags = &ContainsHelppackageFlags;
default_config.contains_helppackage_flags = &ContainsHelppackageFlags;
default_config.version_string = &VersionString;
default_config.normalize_filename = &NormalizeFilename;
return default_config;
}
void ReportUsageError(absl::string_view msg, bool is_fatal) {
std::cerr << "ERROR: " << msg << std::endl;
if (is_fatal) {
AbslInternalReportFatalUsageError(msg);
}
}
} // namespace flags_internal
void SetFlagsUsageConfig(FlagsUsageConfig usage_config) {
absl::MutexLock l(&flags_internal::custom_usage_config_guard);
if (!usage_config.contains_helpshort_flags)
usage_config.contains_helpshort_flags =
flags_internal::ContainsHelpshortFlags;
if (!usage_config.contains_help_flags)
usage_config.contains_help_flags = flags_internal::ContainsHelppackageFlags;
if (!usage_config.contains_helppackage_flags)
usage_config.contains_helppackage_flags =
flags_internal::ContainsHelppackageFlags;
if (!usage_config.version_string)
usage_config.version_string = flags_internal::VersionString;
if (!usage_config.normalize_filename)
usage_config.normalize_filename = flags_internal::NormalizeFilename;
if (flags_internal::custom_usage_config)
*flags_internal::custom_usage_config = usage_config;
else
flags_internal::custom_usage_config = new FlagsUsageConfig(usage_config);
}
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: usage_config.h
// -----------------------------------------------------------------------------
//
// This file defines the main usage reporting configuration interfaces and
// documents Abseil's supported built-in usage flags. If these flags are found
// when parsing a command-line, Abseil will exit the program and display
// appropriate help messages.
#ifndef ABSL_FLAGS_USAGE_CONFIG_H_
#define ABSL_FLAGS_USAGE_CONFIG_H_
#include <functional>
#include <string>
#include "absl/strings/string_view.h"
// -----------------------------------------------------------------------------
// Built-in Usage Flags
// -----------------------------------------------------------------------------
//
// Abseil supports the following built-in usage flags. When passed, these flags
// exit the program and :
//
// * --help
// Shows help on important flags for this binary
// * --helpfull
// Shows help on all flags
// * --helpshort
// Shows help on only the main module for this program
// * --helppackage
// Shows help on all modules in the main package
// * --version
// Shows the version and build info for this binary and exits
// * --only_check_args
// Exits after checking all flags
// * --helpon
// Shows help on the modules named by this flag value
// * --helpmatch
// Shows help on modules whose name contains the specified substring
namespace absl {
namespace flags_internal {
using FlagKindFilter = std::function<bool (absl::string_view)>;
} // namespace flags_internal
// FlagsUsageConfig
//
// This structure contains the collection of callbacks for changing the behavior
// of the usage reporting routines in Abseil Flags.
struct FlagsUsageConfig {
// Returns true if flags defined in the given source code file should be
// reported with --helpshort flag. For example, if the file
// "path/to/my/code.cc" defines the flag "--my_flag", and
// contains_helpshort_flags("path/to/my/code.cc") returns true, invoking the
// program with --helpshort will include information about --my_flag in the
// program output.
flags_internal::FlagKindFilter contains_helpshort_flags;
// Returns true if flags defined in the filename should be reported with
// --help flag. For example, if the file
// "path/to/my/code.cc" defines the flag "--my_flag", and
// contains_help_flags("path/to/my/code.cc") returns true, invoking the
// program with --help will include information about --my_flag in the
// program output.
flags_internal::FlagKindFilter contains_help_flags;
// Returns true if flags defined in the filename should be reported with
// --helppackage flag. For example, if the file
// "path/to/my/code.cc" defines the flag "--my_flag", and
// contains_helppackage_flags("path/to/my/code.cc") returns true, invoking the
// program with --helppackage will include information about --my_flag in the
// program output.
flags_internal::FlagKindFilter contains_helppackage_flags;
// Generates std::string containing program version. This is the std::string reported
// when user specifies --version in a command line.
std::function<std::string()> version_string;
// Normalizes the filename specific to the build system/filesystem used. This
// routine is used when we report the information about the flag definition
// location. For instance, if your build resides at some location you do not
// want to expose in the usage output, you can trim it to show only relevant
// part.
// For example:
// normalize_filename("/my_company/some_long_path/src/project/file.cc")
// might produce
// "project/file.cc".
std::function<std::string (absl::string_view)> normalize_filename;
};
// SetFlagsUsageConfig()
//
// Sets the usage reporting configuration callbacks. If any of the callbacks are
// not set in usage_config instance, then the default value of the callback is
// used.
void SetFlagsUsageConfig(FlagsUsageConfig usage_config);
namespace flags_internal {
FlagsUsageConfig GetUsageConfig();
void ReportUsageError(absl::string_view msg, bool is_fatal);
} // namespace flags_internal
} // namespace absl
extern "C" {
// Additional report of fatal usage error message before we std::exit. Error is
// fatal if is_fatal argument to ReportUsageError is true.
void AbslInternalReportFatalUsageError(absl::string_view);
} // extern "C"
#endif // ABSL_FLAGS_USAGE_CONFIG_H_

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/flags/usage_config.h"
#include "gtest/gtest.h"
#include "absl/flags/internal/path_util.h"
#include "absl/flags/internal/program_name.h"
#include "absl/strings/match.h"
namespace {
class FlagsUsageConfigTest : public testing::Test {
protected:
void SetUp() override {
// Install Default config for the use on this unit test.
// Binary may install a custom config before tests are run.
absl::FlagsUsageConfig default_config;
absl::SetFlagsUsageConfig(default_config);
}
};
namespace flags = absl::flags_internal;
bool TstContainsHelpshortFlags(absl::string_view f) {
return absl::StartsWith(flags::Basename(f), "progname.");
}
bool TstContainsHelppackageFlags(absl::string_view f) {
return absl::EndsWith(flags::Package(f), "aaa/");
}
bool TstContainsHelpFlags(absl::string_view f) {
return absl::EndsWith(flags::Package(f), "zzz/");
}
std::string TstVersionString() { return "program 1.0.0"; }
std::string TstNormalizeFilename(absl::string_view filename) {
return std::string(filename.substr(2));
}
void TstReportUsageMessage(absl::string_view msg) {}
// --------------------------------------------------------------------
TEST_F(FlagsUsageConfigTest, TestGetSetFlagsUsageConfig) {
EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
EXPECT_TRUE(flags::GetUsageConfig().version_string);
EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
absl::FlagsUsageConfig empty_config;
empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
empty_config.contains_help_flags = &TstContainsHelpFlags;
empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
empty_config.version_string = &TstVersionString;
empty_config.normalize_filename = &TstNormalizeFilename;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
EXPECT_TRUE(flags::GetUsageConfig().version_string);
EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
}
// --------------------------------------------------------------------
TEST_F(FlagsUsageConfigTest, TestContainsHelpshortFlags) {
flags::SetProgramInvocationName("usage_config_test");
auto config = flags::GetUsageConfig();
EXPECT_TRUE(config.contains_helpshort_flags("adir/cd/usage_config_test.cc"));
EXPECT_TRUE(
config.contains_helpshort_flags("aaaa/usage_config_test-main.cc"));
EXPECT_TRUE(config.contains_helpshort_flags("abc/usage_config_test_main.cc"));
EXPECT_FALSE(config.contains_helpshort_flags("usage_config_main.cc"));
absl::FlagsUsageConfig empty_config;
empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_TRUE(
flags::GetUsageConfig().contains_helpshort_flags("aaa/progname.cpp"));
EXPECT_FALSE(
flags::GetUsageConfig().contains_helpshort_flags("aaa/progmane.cpp"));
}
// --------------------------------------------------------------------
TEST_F(FlagsUsageConfigTest, TestContainsHelpFlags) {
flags::SetProgramInvocationName("usage_config_test");
auto config = flags::GetUsageConfig();
EXPECT_TRUE(config.contains_help_flags("zzz/usage_config_test.cc"));
EXPECT_TRUE(
config.contains_help_flags("bdir/a/zzz/usage_config_test-main.cc"));
EXPECT_TRUE(
config.contains_help_flags("//aqse/zzz/usage_config_test_main.cc"));
EXPECT_FALSE(config.contains_help_flags("zzz/aa/usage_config_main.cc"));
absl::FlagsUsageConfig empty_config;
empty_config.contains_help_flags = &TstContainsHelpFlags;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags("zzz/main-body.c"));
EXPECT_FALSE(
flags::GetUsageConfig().contains_help_flags("zzz/dir/main-body.c"));
}
// --------------------------------------------------------------------
TEST_F(FlagsUsageConfigTest, TestContainsHelppackageFlags) {
flags::SetProgramInvocationName("usage_config_test");
auto config = flags::GetUsageConfig();
EXPECT_TRUE(config.contains_helppackage_flags("aaa/usage_config_test.cc"));
EXPECT_TRUE(
config.contains_helppackage_flags("bbdir/aaa/usage_config_test-main.cc"));
EXPECT_TRUE(config.contains_helppackage_flags(
"//aqswde/aaa/usage_config_test_main.cc"));
EXPECT_FALSE(config.contains_helppackage_flags("aadir/usage_config_main.cc"));
absl::FlagsUsageConfig empty_config;
empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_TRUE(
flags::GetUsageConfig().contains_helppackage_flags("aaa/main-body.c"));
EXPECT_FALSE(
flags::GetUsageConfig().contains_helppackage_flags("aadir/main-body.c"));
}
// --------------------------------------------------------------------
TEST_F(FlagsUsageConfigTest, TestVersionString) {
flags::SetProgramInvocationName("usage_config_test");
#ifdef NDEBUG
std::string expected_output = "usage_config_test\n";
#else
std::string expected_output =
"usage_config_test\nDebug build (NDEBUG not #defined)\n";
#endif
EXPECT_EQ(flags::GetUsageConfig().version_string(), expected_output);
absl::FlagsUsageConfig empty_config;
empty_config.version_string = &TstVersionString;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_EQ(flags::GetUsageConfig().version_string(), "program 1.0.0");
}
// --------------------------------------------------------------------
TEST_F(FlagsUsageConfigTest, TestNormalizeFilename) {
// This tests the default implementation.
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/"), "");
// This tests that the custom implementation is called.
absl::FlagsUsageConfig empty_config;
empty_config.normalize_filename = &TstNormalizeFilename;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("aaa/a.cc"), "a/a.cc");
// This tests that the default implementation is called.
empty_config.normalize_filename = nullptr;
absl::SetFlagsUsageConfig(empty_config);
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\a\\a.cc"), "a\\a.cc");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("//"), "");
EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\\\"), "");
}
} // namespace

2
absl/hash/BUILD.bazel
View file

@ -35,10 +35,10 @@ cc_library(
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":city",
"//absl/base:core_headers",
"//absl/base:endian",
"//absl/container:fixed_array",
"//absl/hash:city",
"//absl/meta:type_traits",
"//absl/numeric:int128",
"//absl/strings",

15
absl/hash/hash.h
View file

@ -42,7 +42,7 @@
//
// Example:
//
// // Suppose we have a class `Circle` for which we want to add hashing
// // Suppose we have a class `Circle` for which we want to add hashing:
// class Circle {
// public:
// ...
@ -51,14 +51,19 @@
// int radius_;
// };
//
// // To add hashing support to `Circle`, we simply need to add an ordinary
// // function `AbslHashValue()`, and return the combined hash state of the
// // existing hash state and the class state:
//
// // To add hashing support to `Circle`, we simply need to add a free
// // (non-member) function `AbslHashValue()`, and return the combined hash
// // state of the existing hash state and the class state. You can add such a
// // free function using a friend declaration within the body of the class:
// class Circle {
// public:
// ...
// template <typename H>
// friend H AbslHashValue(H h, const Circle& c) {
// return H::combine(std::move(h), c.center_, c.radius_);
// }
// ...
// };
//
// For more information, see Adding Type Support to `absl::Hash` below.
//

12
absl/strings/str_cat.h
View file

@ -56,6 +56,7 @@
#include <cstdint>
#include <string>
#include <type_traits>
#include <vector>
#include "absl/base/port.h"
#include "absl/strings/numbers.h"
@ -268,6 +269,17 @@ class AlphaNum {
AlphaNum(T e) // NOLINT(runtime/explicit)
: AlphaNum(static_cast<typename std::underlying_type<T>::type>(e)) {}
// vector<bool>::reference and const_reference require special help to
// convert to `AlphaNum` because it requires two user defined conversions.
template <
typename T,
typename std::enable_if<
std::is_class<T>::value &&
(std::is_same<T, std::vector<bool>::reference>::value ||
std::is_same<T, std::vector<bool>::const_reference>::value)>::type* =
nullptr>
AlphaNum(T e) : AlphaNum(static_cast<bool>(e)) {} // NOLINT(runtime/explicit)
private:
absl::string_view piece_;
char digits_[numbers_internal::kFastToBufferSize];

13
absl/strings/str_cat_test.cc
View file

@ -18,6 +18,7 @@
#include <cstdint>
#include <string>
#include <vector>
#include "gtest/gtest.h"
#include "absl/strings/substitute.h"
@ -395,6 +396,18 @@ TEST(StrAppend, Basics) {
"No limit thanks to C++11's variadic templates");
}
TEST(StrCat, VectorBoolReferenceTypes) {
std::vector<bool> v;
v.push_back(true);
v.push_back(false);
std::vector<bool> const& cv = v;
// Test that vector<bool>::reference and vector<bool>::const_reference
// are handled as if the were really bool types and not the proxy types
// they really are.
std::string result = absl::StrCat(v[0], v[1], cv[0], cv[1]); // NOLINT
EXPECT_EQ(result, "1010");
}
#ifdef GTEST_HAS_DEATH_TEST
TEST(StrAppend, Death) {
std::string s = "self";

2
absl/types/optional.h
View file

@ -507,7 +507,7 @@ class optional : private optional_internal::optional_data<T>,
template <typename U>
T value_or(U&& v) && { // NOLINT(build/c++11)
static_assert(std::is_move_constructible<value_type>::value,
"optional<T>::value_or: T must by copy constructible");
"optional<T>::value_or: T must by move constructible");
static_assert(std::is_convertible<U&&, value_type>::value,
"optional<T>::value_or: U must be convertible to T");
return static_cast<bool>(*this) ? std::move(**this)