chromium/third_party/abseil-cpp/absl/strings/internal/str_format/constexpr_parser.h

// Copyright 2022 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_STRINGS_INTERNAL_STR_FORMAT_CONSTEXPR_PARSER_H_
#define ABSL_STRINGS_INTERNAL_STR_FORMAT_CONSTEXPR_PARSER_H_

#include <cassert>
#include <cstdint>
#include <cstdio>
#include <limits>

#include "absl/base/config.h"
#include "absl/base/const_init.h"
#include "absl/base/optimization.h"
#include "absl/strings/internal/str_format/extension.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace str_format_internal {

// The analyzed properties of a single specified conversion.
struct UnboundConversion { … };

// Helper tag class for the table below.
// It allows fast `char -> ConversionChar/LengthMod/Flags` checking and
// conversions.
class ConvTag { … };

struct ConvTagHolder { … };

// Keep a single table for all the conversion chars and length modifiers.
constexpr ConvTag GetTagForChar(char c) { … }

constexpr bool CheckFastPathSetting(const UnboundConversion& conv) { … }

constexpr int ParseDigits(char& c, const char*& pos, const char* const end) { … }

template <bool is_positional>
constexpr const char* ConsumeConversion(const char* pos, const char* const end,
                                        UnboundConversion* conv,
                                        int* next_arg) { … }

// Consume conversion spec prefix (not including '%') of [p, end) if valid.
// Examples of valid specs would be e.g.: "s", "d", "-12.6f".
// If valid, it returns the first character following the conversion spec,
// and the spec part is broken down and returned in 'conv'.
// If invalid, returns nullptr.
constexpr const char* ConsumeUnboundConversion(const char* p, const char* end,
                                               UnboundConversion* conv,
                                               int* next_arg) { … }

}  // namespace str_format_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_CONSTEXPR_PARSER_H_