tvl-depot/absl/strings/str_split.cc

137 lines
4.4 KiB
C++
Raw Normal View History

2017-09-19 22:54:40 +02:00
// Copyright 2017 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
//
// http://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/strings/str_split.h"
Changes imported from Abseil "staging" branch: - b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Fix some typos in the usage examples by Jorg Brown <jorg@google.com> - 82be4a9adf3bb0ddafc0d46274969c99afffe870 Fix typo in optional.h comment. by Abseil Team <absl-team@google.com> - d6ee63bf8fc51fba074c23b33cebc28c808d7f07 Remove internal-only identifiers from code. by Daniel Katz <katzdm@google.com> - f9c3ad2f0d73f53b21603638af8b4bed636e79f4 Use easier understandable names for absl::StartsWith and ... by Abseil Team <absl-team@google.com> - 7c16c14fefee89c927b8789d6043c4691bcffc9b Add -Wno-missing-prototypes back to the LLVM copts. by Derek Mauro <dmauro@google.com> - 2f4b7d2e50c7023240242f1e15db60ccd7e8768d IWYU | absl/strings by Juemin Yang <jueminyang@google.com> - a99cbcc1daa34a2d6a2bb26de275e05173cc77e9 IWYU | absl/type by Juemin Yang <jueminyang@google.com> - 12e1146d0fc76c071d7e0ebaabb62f0a984fae66 Use LLVM_FLAGS and LLVM_TEST_FLAGS when --compiler=llvm. by Derek Mauro <dmauro@google.com> - cd6bea616abda558d0bace5bd77455662a233688 IWYU | absl/debugging by Juemin Yang <jueminyang@google.com> - d9a7382e59d46a8581b6b7a31cd5a48bb89326e9 IWYU | absl/synchronization by Juemin Yang <jueminyang@google.com> - 07ec7d6d5a4a666f4183c5d0ed9c342baa7b24bc IWYU | absl/numeric by Juemin Yang <jueminyang@google.com> - 12bfe40051f4270f8707e191af5652f83f2f750c Remove the RoundTrip{Float,Double}ToBuffer routines from ... by Jorg Brown <jorg@google.com> - eeb4fd67c9d97f66cb9475c3c5e51ab132f1c810 Adds conversion functions for converting between absl/tim... by Greg Miller <jgm@google.com> - 59a2108d05d4ea85dc5cc11e49b2cd2335d4295a Change Substitute to use %.6g formatting rather than 15/1... by Jorg Brown <jorg@google.com> - 394becb48e0fcd161642cdaac5120d32567e0ef8 IWYU | absl/meta by Juemin Yang <jueminyang@google.com> - 1e5da6e8da336699b2469dcf6dda025b9b0ec4c9 Rewrite atomic_hook.h to not use std::atomic<T*> under Wi... by Greg Falcon <gfalcon@google.com> GitOrigin-RevId: b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Change-Id: I14e331d91c956ef045ac7927091a9f179716de0c
2017-09-24 17:20:48 +02:00
#include <algorithm>
2017-09-19 22:54:40 +02:00
#include <cassert>
Changes imported from Abseil "staging" branch: - b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Fix some typos in the usage examples by Jorg Brown <jorg@google.com> - 82be4a9adf3bb0ddafc0d46274969c99afffe870 Fix typo in optional.h comment. by Abseil Team <absl-team@google.com> - d6ee63bf8fc51fba074c23b33cebc28c808d7f07 Remove internal-only identifiers from code. by Daniel Katz <katzdm@google.com> - f9c3ad2f0d73f53b21603638af8b4bed636e79f4 Use easier understandable names for absl::StartsWith and ... by Abseil Team <absl-team@google.com> - 7c16c14fefee89c927b8789d6043c4691bcffc9b Add -Wno-missing-prototypes back to the LLVM copts. by Derek Mauro <dmauro@google.com> - 2f4b7d2e50c7023240242f1e15db60ccd7e8768d IWYU | absl/strings by Juemin Yang <jueminyang@google.com> - a99cbcc1daa34a2d6a2bb26de275e05173cc77e9 IWYU | absl/type by Juemin Yang <jueminyang@google.com> - 12e1146d0fc76c071d7e0ebaabb62f0a984fae66 Use LLVM_FLAGS and LLVM_TEST_FLAGS when --compiler=llvm. by Derek Mauro <dmauro@google.com> - cd6bea616abda558d0bace5bd77455662a233688 IWYU | absl/debugging by Juemin Yang <jueminyang@google.com> - d9a7382e59d46a8581b6b7a31cd5a48bb89326e9 IWYU | absl/synchronization by Juemin Yang <jueminyang@google.com> - 07ec7d6d5a4a666f4183c5d0ed9c342baa7b24bc IWYU | absl/numeric by Juemin Yang <jueminyang@google.com> - 12bfe40051f4270f8707e191af5652f83f2f750c Remove the RoundTrip{Float,Double}ToBuffer routines from ... by Jorg Brown <jorg@google.com> - eeb4fd67c9d97f66cb9475c3c5e51ab132f1c810 Adds conversion functions for converting between absl/tim... by Greg Miller <jgm@google.com> - 59a2108d05d4ea85dc5cc11e49b2cd2335d4295a Change Substitute to use %.6g formatting rather than 15/1... by Jorg Brown <jorg@google.com> - 394becb48e0fcd161642cdaac5120d32567e0ef8 IWYU | absl/meta by Juemin Yang <jueminyang@google.com> - 1e5da6e8da336699b2469dcf6dda025b9b0ec4c9 Rewrite atomic_hook.h to not use std::atomic<T*> under Wi... by Greg Falcon <gfalcon@google.com> GitOrigin-RevId: b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Change-Id: I14e331d91c956ef045ac7927091a9f179716de0c
2017-09-24 17:20:48 +02:00
#include <cstdint>
2017-09-19 22:54:40 +02:00
#include <cstdlib>
#include <cstring>
#include <iterator>
#include <limits>
Changes imported from Abseil "staging" branch: - b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Fix some typos in the usage examples by Jorg Brown <jorg@google.com> - 82be4a9adf3bb0ddafc0d46274969c99afffe870 Fix typo in optional.h comment. by Abseil Team <absl-team@google.com> - d6ee63bf8fc51fba074c23b33cebc28c808d7f07 Remove internal-only identifiers from code. by Daniel Katz <katzdm@google.com> - f9c3ad2f0d73f53b21603638af8b4bed636e79f4 Use easier understandable names for absl::StartsWith and ... by Abseil Team <absl-team@google.com> - 7c16c14fefee89c927b8789d6043c4691bcffc9b Add -Wno-missing-prototypes back to the LLVM copts. by Derek Mauro <dmauro@google.com> - 2f4b7d2e50c7023240242f1e15db60ccd7e8768d IWYU | absl/strings by Juemin Yang <jueminyang@google.com> - a99cbcc1daa34a2d6a2bb26de275e05173cc77e9 IWYU | absl/type by Juemin Yang <jueminyang@google.com> - 12e1146d0fc76c071d7e0ebaabb62f0a984fae66 Use LLVM_FLAGS and LLVM_TEST_FLAGS when --compiler=llvm. by Derek Mauro <dmauro@google.com> - cd6bea616abda558d0bace5bd77455662a233688 IWYU | absl/debugging by Juemin Yang <jueminyang@google.com> - d9a7382e59d46a8581b6b7a31cd5a48bb89326e9 IWYU | absl/synchronization by Juemin Yang <jueminyang@google.com> - 07ec7d6d5a4a666f4183c5d0ed9c342baa7b24bc IWYU | absl/numeric by Juemin Yang <jueminyang@google.com> - 12bfe40051f4270f8707e191af5652f83f2f750c Remove the RoundTrip{Float,Double}ToBuffer routines from ... by Jorg Brown <jorg@google.com> - eeb4fd67c9d97f66cb9475c3c5e51ab132f1c810 Adds conversion functions for converting between absl/tim... by Greg Miller <jgm@google.com> - 59a2108d05d4ea85dc5cc11e49b2cd2335d4295a Change Substitute to use %.6g formatting rather than 15/1... by Jorg Brown <jorg@google.com> - 394becb48e0fcd161642cdaac5120d32567e0ef8 IWYU | absl/meta by Juemin Yang <jueminyang@google.com> - 1e5da6e8da336699b2469dcf6dda025b9b0ec4c9 Rewrite atomic_hook.h to not use std::atomic<T*> under Wi... by Greg Falcon <gfalcon@google.com> GitOrigin-RevId: b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Change-Id: I14e331d91c956ef045ac7927091a9f179716de0c
2017-09-24 17:20:48 +02:00
#include <memory>
2017-09-19 22:54:40 +02:00
#include "absl/base/internal/raw_logging.h"
#include "absl/strings/ascii.h"
namespace absl {
namespace {
// This GenericFind() template function encapsulates the finding algorithm
// shared between the ByString and ByAnyChar delimiters. The FindPolicy
// template parameter allows each delimiter to customize the actual find
// function to use and the length of the found delimiter. For example, the
// Literal delimiter will ultimately use absl::string_view::find(), and the
// AnyOf delimiter will use absl::string_view::find_first_of().
template <typename FindPolicy>
absl::string_view GenericFind(absl::string_view text,
absl::string_view delimiter, size_t pos,
FindPolicy find_policy) {
if (delimiter.empty() && text.length() > 0) {
// Special case for empty std::string delimiters: always return a zero-length
// absl::string_view referring to the item at position 1 past pos.
return absl::string_view(text.begin() + pos + 1, 0);
}
size_t found_pos = absl::string_view::npos;
absl::string_view found(text.end(), 0); // By default, not found
found_pos = find_policy.Find(text, delimiter, pos);
if (found_pos != absl::string_view::npos) {
found = absl::string_view(text.data() + found_pos,
find_policy.Length(delimiter));
}
return found;
}
// Finds using absl::string_view::find(), therefore the length of the found
// delimiter is delimiter.length().
struct LiteralPolicy {
size_t Find(absl::string_view text, absl::string_view delimiter, size_t pos) {
return text.find(delimiter, pos);
}
size_t Length(absl::string_view delimiter) { return delimiter.length(); }
};
// Finds using absl::string_view::find_first_of(), therefore the length of the
// found delimiter is 1.
struct AnyOfPolicy {
size_t Find(absl::string_view text, absl::string_view delimiter, size_t pos) {
return text.find_first_of(delimiter, pos);
}
size_t Length(absl::string_view /* delimiter */) { return 1; }
};
} // namespace
//
// ByString
//
ByString::ByString(absl::string_view sp) : delimiter_(sp) {}
absl::string_view ByString::Find(absl::string_view text, size_t pos) const {
if (delimiter_.length() == 1) {
// Much faster to call find on a single character than on an
// absl::string_view.
size_t found_pos = text.find(delimiter_[0], pos);
if (found_pos == absl::string_view::npos)
return absl::string_view(text.end(), 0);
return text.substr(found_pos, 1);
}
return GenericFind(text, delimiter_, pos, LiteralPolicy());
}
//
// ByChar
//
absl::string_view ByChar::Find(absl::string_view text, size_t pos) const {
size_t found_pos = text.find(c_, pos);
if (found_pos == absl::string_view::npos)
return absl::string_view(text.end(), 0);
return text.substr(found_pos, 1);
}
//
// ByAnyChar
//
ByAnyChar::ByAnyChar(absl::string_view sp) : delimiters_(sp) {}
absl::string_view ByAnyChar::Find(absl::string_view text, size_t pos) const {
return GenericFind(text, delimiters_, pos, AnyOfPolicy());
}
//
// ByLength
//
ByLength::ByLength(ptrdiff_t length) : length_(length) {
ABSL_RAW_CHECK(length > 0, "");
}
absl::string_view ByLength::Find(absl::string_view text,
size_t pos) const {
pos = std::min(pos, text.size()); // truncate `pos`
absl::string_view substr = text.substr(pos);
// If the std::string is shorter than the chunk size we say we
// "can't find the delimiter" so this will be the last chunk.
if (substr.length() <= static_cast<size_t>(length_))
return absl::string_view(text.end(), 0);
return absl::string_view(substr.begin() + length_, 0);
}
} // namespace absl