fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
240 lines
7.8 KiB
C++
240 lines
7.8 KiB
C++
//
|
|
// 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 <stddef.h>
|
|
|
|
#include <cmath>
|
|
#include <limits>
|
|
#include <string>
|
|
#include <type_traits>
|
|
#include <vector>
|
|
|
|
#include "absl/base/config.h"
|
|
#include "absl/base/log_severity.h"
|
|
#include "absl/base/macros.h"
|
|
#include "absl/strings/ascii.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"
|
|
#include "absl/strings/string_view.h"
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
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 string -> value -> 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
|
|
|
|
bool AbslParseFlag(absl::string_view text, absl::LogSeverity* dst,
|
|
std::string* err) {
|
|
text = absl::StripAsciiWhitespace(text);
|
|
if (text.empty()) {
|
|
*err = "no value provided";
|
|
return false;
|
|
}
|
|
if (text.front() == 'k' || text.front() == 'K') text.remove_prefix(1);
|
|
if (absl::EqualsIgnoreCase(text, "info")) {
|
|
*dst = absl::LogSeverity::kInfo;
|
|
return true;
|
|
}
|
|
if (absl::EqualsIgnoreCase(text, "warning")) {
|
|
*dst = absl::LogSeverity::kWarning;
|
|
return true;
|
|
}
|
|
if (absl::EqualsIgnoreCase(text, "error")) {
|
|
*dst = absl::LogSeverity::kError;
|
|
return true;
|
|
}
|
|
if (absl::EqualsIgnoreCase(text, "fatal")) {
|
|
*dst = absl::LogSeverity::kFatal;
|
|
return true;
|
|
}
|
|
std::underlying_type<absl::LogSeverity>::type numeric_value;
|
|
if (absl::ParseFlag(text, &numeric_value, err)) {
|
|
*dst = static_cast<absl::LogSeverity>(numeric_value);
|
|
return true;
|
|
}
|
|
*err = "only integers and absl::LogSeverity enumerators are accepted";
|
|
return false;
|
|
}
|
|
|
|
std::string AbslUnparseFlag(absl::LogSeverity v) {
|
|
if (v == absl::NormalizeLogSeverity(v)) return absl::LogSeverityName(v);
|
|
return absl::UnparseFlag(static_cast<int>(v));
|
|
}
|
|
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|