Ryan VanderMeulen
807c6f801c
Also add absl/strings/internal/utf8.cc to the sandbox source lists; the newer str_format wide-char path references WideToUtf8. Differential Revision: https://phabricator.services.mozilla.com/D309452
119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
// Copyright 2025 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/strings/internal/generic_printer.h"
|
|
|
|
#include <cstddef>
|
|
#include <cstdlib>
|
|
#include <ostream>
|
|
#include <string>
|
|
|
|
#include "absl/base/config.h"
|
|
#include "absl/strings/ascii.h"
|
|
#include "absl/strings/escaping.h"
|
|
#include "absl/strings/numbers.h"
|
|
#include "absl/strings/str_format.h"
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
namespace internal_generic_printer {
|
|
|
|
// Out-of-line helper for PrintAsStringWithEscaping.
|
|
std::ostream& PrintEscapedString(std::ostream& os, absl::string_view v) {
|
|
return os << "\"" << absl::CHexEscape(v) << "\"";
|
|
}
|
|
|
|
// Retuns a string representation of 'v', shortened if possible.
|
|
template <class T, class F>
|
|
std::string TryShorten(T v, F strtox) {
|
|
std::string printed =
|
|
absl::StrFormat("%.*g", std::numeric_limits<T>::max_digits10 / 2, v);
|
|
T parsed = strtox(printed.data());
|
|
if (parsed != v) {
|
|
printed =
|
|
absl::StrFormat("%.*g", std::numeric_limits<T>::max_digits10 + 1, v);
|
|
}
|
|
return printed;
|
|
}
|
|
|
|
// Out-of-line helpers for floating point values. These don't necessarily
|
|
// ensure that values are precise, but rather that they are wide enough to
|
|
// represent distinct values. go/c++17std/numeric.limits.members.html
|
|
std::ostream& PrintPreciseFP(std::ostream& os, float v) {
|
|
// TryShorten formats with absl::StrFormat(), which is locale-independent and
|
|
// always emits a '.' radix. Use absl::SimpleAtof() for locale-independent
|
|
// parsing.
|
|
return os << TryShorten(v, [](const char* buf) {
|
|
float out = 0;
|
|
static_cast<void>(absl::SimpleAtof(buf, &out));
|
|
return out;
|
|
}) << "f";
|
|
}
|
|
std::ostream& PrintPreciseFP(std::ostream& os, double v) {
|
|
// TryShorten formats with absl::StrFormat(), which is locale-independent and
|
|
// always emits a '.' radix. Use absl::SimpleAtod() for locale-independent
|
|
// parsing.
|
|
return os << TryShorten(v, [](const char* buf) {
|
|
double out = 0;
|
|
static_cast<void>(absl::SimpleAtod(buf, &out));
|
|
return out;
|
|
});
|
|
}
|
|
std::ostream& PrintPreciseFP(std::ostream& os, long double v) {
|
|
// No locale-independent long double parser is available, so this path keeps
|
|
// std::strtold and remains locale-sensitive.
|
|
return os << TryShorten(v, [](const char* buf) {
|
|
char* unused;
|
|
return std::strtold(buf, &unused);
|
|
}) << "L";
|
|
}
|
|
|
|
// Prints a nibble of 'v' in hexadecimal.
|
|
inline char hexnib(int v) {
|
|
return static_cast<char>((v < 10 ? '0' : ('a' - 10)) + v);
|
|
}
|
|
|
|
template <typename T>
|
|
static std::ostream& PrintCharImpl(std::ostream& os, T v) {
|
|
// Specialization for chars: print as 'c' if printable, otherwise
|
|
// hex-escaped.
|
|
return (absl::ascii_isprint(static_cast<unsigned char>(v))
|
|
? (os << (v == '\'' ? "'\\" : "'") << v)
|
|
: (os << "'\\x" << hexnib((v >> 4) & 0xf) << hexnib(v & 0xf)))
|
|
<< "' (0x" << hexnib((v >> 4) & 0xf) << hexnib(v & 0xf) << " "
|
|
<< static_cast<int>(v) << ")";
|
|
}
|
|
|
|
std::ostream& PrintChar(std::ostream& os, char c) {
|
|
return PrintCharImpl(os, c);
|
|
}
|
|
|
|
std::ostream& PrintChar(std::ostream& os, signed char c) {
|
|
return PrintCharImpl(os, c);
|
|
}
|
|
|
|
std::ostream& PrintChar(std::ostream& os, unsigned char c) {
|
|
return PrintCharImpl(os, c);
|
|
}
|
|
|
|
std::ostream& PrintByte(std::ostream& os, std::byte b) {
|
|
auto v = std::to_integer<int>(b);
|
|
os << "0x" << hexnib((v >> 4) & 0xf) << hexnib(v & 0xf);
|
|
return os;
|
|
}
|
|
|
|
} // namespace internal_generic_printer
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|