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