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//
// 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 <limits>
#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 <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 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<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
} // namespace absl
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