0f4bc96675
-- ed4be0cb9a708158187a0628c1c2167ae6783274 by Greg Falcon <gfalcon@google.com>: Refactor a string unit test into a template function for internal purposes. PiperOrigin-RevId: 210798880 -- e4c734be903ac7b3a88caf4b17909343c283a21a by Abseil Team <absl-team@google.com>: Add a note that the RFC3339_* format specifiers use %Y, and so do not produce 4-digit years on output nor require 4-digit years on input, as a strict reading of RFC3339 might require. PiperOrigin-RevId: 210785544 -- cfb5e32f9397e49ddb731445a191b36652fe2f6d by Greg Falcon <gfalcon@google.com>: Refactor a string unit test into a template function for internal purposes. PiperOrigin-RevId: 210776525 -- 105ee700e62869cfda2a37e6f7c2ea483f8fc75e by Xiaoyi Zhang <zhangxy@google.com>: Correctly define ABSL_HAVE_STD_STRING_VIEW for MSVC 2017. Currently the macro is not defined even though MSVC 2017 provides `std::string_view`, and this means both `absl::string_view` and `std::string_view` exist as distinct types. A bunch of places relying on the false assumption that `string_view::const_iterator` is `const char*` have to be fixed to build successfully. See related github issue https://github.com/abseil/abseil-cpp/issues/161. PiperOrigin-RevId: 210764947 GitOrigin-RevId: ed4be0cb9a708158187a0628c1c2167ae6783274 Change-Id: I7a9658b3201aa669db9d3d90474feb08072718c7
101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Output extension hooks for the Format library.
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// `internal::InvokeFlush` calls the appropriate flush function for the
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// specified output argument.
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// `BufferRawSink` is a simple output sink for a char buffer. Used by SnprintF.
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// `FILERawSink` is a std::FILE* based sink. Used by PrintF and FprintF.
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#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
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#define ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
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#include <cstdio>
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#include <ostream>
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#include <string>
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#include "absl/base/port.h"
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#include "absl/strings/string_view.h"
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class Cord;
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namespace absl {
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namespace str_format_internal {
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// RawSink implementation that writes into a char* buffer.
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// It will not overflow the buffer, but will keep the total count of chars
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// that would have been written.
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class BufferRawSink {
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public:
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BufferRawSink(char* buffer, size_t size) : buffer_(buffer), size_(size) {}
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size_t total_written() const { return total_written_; }
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void Write(string_view v);
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private:
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char* buffer_;
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size_t size_;
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size_t total_written_ = 0;
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};
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// RawSink implementation that writes into a FILE*.
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// It keeps track of the total number of bytes written and any error encountered
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// during the writes.
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class FILERawSink {
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public:
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explicit FILERawSink(std::FILE* output) : output_(output) {}
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void Write(string_view v);
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size_t count() const { return count_; }
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int error() const { return error_; }
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private:
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std::FILE* output_;
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int error_ = 0;
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size_t count_ = 0;
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};
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// Provide RawSink integration with common types from the STL.
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inline void AbslFormatFlush(std::string* out, string_view s) {
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out->append(s.data(), s.size());
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}
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inline void AbslFormatFlush(std::ostream* out, string_view s) {
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out->write(s.data(), s.size());
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}
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template <class AbslCord, typename = typename std::enable_if<
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std::is_same<AbslCord, ::Cord>::value>::type>
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inline void AbslFormatFlush(AbslCord* out, string_view s) {
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out->Append(s);
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}
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inline void AbslFormatFlush(FILERawSink* sink, string_view v) {
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sink->Write(v);
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}
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inline void AbslFormatFlush(BufferRawSink* sink, string_view v) {
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sink->Write(v);
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}
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template <typename T>
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auto InvokeFlush(T* out, string_view s)
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-> decltype(str_format_internal::AbslFormatFlush(out, s)) {
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str_format_internal::AbslFormatFlush(out, s);
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}
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} // namespace str_format_internal
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} // namespace absl
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#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
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