From aa468ad75539619b47979911297efbb629c52e44 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 7 May 2019 12:56:42 -0700 Subject: Export of internal Abseil changes. -- 78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer : internal changes PiperOrigin-RevId: 247073879 -- 7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro : Release commandline flags PiperOrigin-RevId: 247065920 -- 2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck : Add documentation for built-in usage flags PiperOrigin-RevId: 247058863 -- 14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro : Internal change PiperOrigin-RevId: 247058292 -- ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team : Internal Change. PiperOrigin-RevId: 246828655 -- e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team : Internal change PiperOrigin-RevId: 246822325 -- 907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier : Accept vector::reference in StrCat and friends. Converting vector::reference to alphanum requires two user defined conversions, which isn't allowed. In order to accept this, we need a special constructor that is only enabled for the bool proxy types. PiperOrigin-RevId: 246626732 -- fe4295fa95cc65dee8c881ba12dd8f516e68c40d by Abseil Team : Clarify the proper way to define AbslHashValue, and fix confusing indentation. PiperOrigin-RevId: 246406528 -- d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental : Internal change PiperOrigin-RevId: 246358214 -- a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team : Fix sample template instantiation. PiperOrigin-RevId: 246354617 -- 29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team : Fix incorrectly copy-pasted static_assert in absl::optional::value_or The static_assert for a move-constructible type previously said the type must be copy-constructible. PiperOrigin-RevId: 246313827 -- 41884d5872d4ea2c67875b00144b8c8a5859a295 by Greg Falcon : Import of CCTZ from GitHub. PiperOrigin-RevId: 245418790 -- 7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team : Internal change PiperOrigin-RevId: 245412658 -- 730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon : internal change PiperOrigin-RevId: 245293234 -- cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon : Internal change PiperOrigin-RevId: 245288164 GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515 Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6 --- absl/flags/marshalling.cc | 189 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 189 insertions(+) create mode 100644 absl/flags/marshalling.cc (limited to 'absl/flags/marshalling.cc') diff --git a/absl/flags/marshalling.cc b/absl/flags/marshalling.cc new file mode 100644 index 000000000000..f025ae7e86c4 --- /dev/null +++ b/absl/flags/marshalling.cc @@ -0,0 +1,189 @@ +// +// 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 + +#include "absl/base/macros.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" + +namespace absl { +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 +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(val) != val) // worked, but number out of range + return false; + *dst = static_cast(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(val) != + val) // worked, but number out of range + return false; + *dst = static_cast(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* 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 +std::string UnparseFloatingPointVal(T v) { + // digits10 is guaranteed to roundtrip correctly in std::string -> value -> std::string + // conversions, but may not be enough to represent all the values correctly. + std::string digit10_str = + absl::StrFormat("%.*g", std::numeric_limits::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::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& v) { + return absl::StrJoin(v, ","); +} + +} // namespace flags_internal +} // namespace absl -- cgit 1.4.1