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Diffstat (limited to 'third_party/abseil_cpp/absl/strings/internal/charconv_parse.h')
-rw-r--r-- | third_party/abseil_cpp/absl/strings/internal/charconv_parse.h | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/third_party/abseil_cpp/absl/strings/internal/charconv_parse.h b/third_party/abseil_cpp/absl/strings/internal/charconv_parse.h deleted file mode 100644 index 505998b5394a..000000000000 --- a/third_party/abseil_cpp/absl/strings/internal/charconv_parse.h +++ /dev/null @@ -1,99 +0,0 @@ -// Copyright 2018 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_CHARCONV_PARSE_H_ -#define ABSL_STRINGS_INTERNAL_CHARCONV_PARSE_H_ - -#include <cstdint> - -#include "absl/base/config.h" -#include "absl/strings/charconv.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace strings_internal { - -// Enum indicating whether a parsed float is a number or special value. -enum class FloatType { kNumber, kInfinity, kNan }; - -// The decomposed parts of a parsed `float` or `double`. -struct ParsedFloat { - // Representation of the parsed mantissa, with the decimal point adjusted to - // make it an integer. - // - // During decimal scanning, this contains 19 significant digits worth of - // mantissa value. If digits beyond this point are found, they - // are truncated, and if any of these dropped digits are nonzero, then - // `mantissa` is inexact, and the full mantissa is stored in [subrange_begin, - // subrange_end). - // - // During hexadecimal scanning, this contains 15 significant hex digits worth - // of mantissa value. Digits beyond this point are sticky -- they are - // truncated, but if any dropped digits are nonzero, the low bit of mantissa - // will be set. (This allows for precise rounding, and avoids the need - // to store the full mantissa in [subrange_begin, subrange_end).) - uint64_t mantissa = 0; - - // Floating point expontent. This reflects any decimal point adjustments and - // any truncated digits from the mantissa. The absolute value of the parsed - // number is represented by mantissa * (base ** exponent), where base==10 for - // decimal floats, and base==2 for hexadecimal floats. - int exponent = 0; - - // The literal exponent value scanned from the input, or 0 if none was - // present. This does not reflect any adjustments applied to mantissa. - int literal_exponent = 0; - - // The type of number scanned. - FloatType type = FloatType::kNumber; - - // When non-null, [subrange_begin, subrange_end) marks a range of characters - // that require further processing. The meaning is dependent on float type. - // If type == kNumber and this is set, this is a "wide input": the input - // mantissa contained more than 19 digits. The range contains the full - // mantissa. It plus `literal_exponent` need to be examined to find the best - // floating point match. - // If type == kNan and this is set, the range marks the contents of a - // matched parenthesized character region after the NaN. - const char* subrange_begin = nullptr; - const char* subrange_end = nullptr; - - // One-past-the-end of the successfully parsed region, or nullptr if no - // matching pattern was found. - const char* end = nullptr; -}; - -// Read the floating point number in the provided range, and populate -// ParsedFloat accordingly. -// -// format_flags is a bitmask value specifying what patterns this API will match. -// `scientific` and `fixed` are honored per std::from_chars rules -// ([utility.from.chars], C++17): if exactly one of these bits is set, then an -// exponent is required, or dislallowed, respectively. -// -// Template parameter `base` must be either 10 or 16. For base 16, a "0x" is -// *not* consumed. The `hex` bit from format_flags is ignored by ParseFloat. -template <int base> -ParsedFloat ParseFloat(const char* begin, const char* end, - absl::chars_format format_flags); - -extern template ParsedFloat ParseFloat<10>(const char* begin, const char* end, - absl::chars_format format_flags); -extern template ParsedFloat ParseFloat<16>(const char* begin, const char* end, - absl::chars_format format_flags); - -} // namespace strings_internal -ABSL_NAMESPACE_END -} // namespace absl -#endif // ABSL_STRINGS_INTERNAL_CHARCONV_PARSE_H_ |