137 lines
3.7 KiB
C++
137 lines
3.7 KiB
C++
// Formatting library for C++ - std::ostream support
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//
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// Copyright (c) 2012 - 2016, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_OSTREAM_H_
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#define FMT_OSTREAM_H_
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#include "fmt/format.h"
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#include <ostream>
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namespace fmt {
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namespace internal {
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template <class Char>
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class FormatBuf : public std::basic_streambuf<Char> {
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private:
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typedef typename std::basic_streambuf<Char>::int_type int_type;
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typedef typename std::basic_streambuf<Char>::traits_type traits_type;
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basic_buffer<Char> &buffer_;
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Char *start_;
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public:
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FormatBuf(basic_buffer<Char> &buffer) : buffer_(buffer), start_(&buffer[0]) {
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this->setp(start_, start_ + buffer_.capacity());
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}
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int_type overflow(int_type ch = traits_type::eof()) {
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if (!traits_type::eq_int_type(ch, traits_type::eof())) {
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size_t buf_size = size();
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buffer_.resize(buf_size);
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buffer_.reserve(buf_size * 2);
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start_ = &buffer_[0];
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start_[buf_size] = traits_type::to_char_type(ch);
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this->setp(start_+ buf_size + 1, start_ + buf_size * 2);
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}
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return ch;
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}
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size_t size() const {
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return to_unsigned(this->pptr() - start_);
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}
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};
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yes &convert(std::ostream &);
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struct DummyStream : std::ostream {
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DummyStream(); // Suppress a bogus warning in MSVC.
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// Hide all operator<< overloads from std::ostream.
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void operator<<(null<>);
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};
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no &operator<<(std::ostream &, int);
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template<typename T>
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struct convert_to_int_impl<T, true> {
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// Convert to int only if T doesn't have an overloaded operator<<.
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enum {
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value = sizeof(convert(std::declval<DummyStream&>() << std::declval<T>()))
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== sizeof(no)
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};
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};
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// Write the content of buf to os.
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template <typename Char>
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void write(std::basic_ostream<Char> &os, basic_buffer<Char> &buf) {
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const Char *data = buf.data();
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typedef std::make_unsigned<std::streamsize>::type UnsignedStreamSize;
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UnsignedStreamSize size = buf.size();
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UnsignedStreamSize max_size =
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internal::to_unsigned((std::numeric_limits<std::streamsize>::max)());
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do {
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UnsignedStreamSize n = size <= max_size ? size : max_size;
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os.write(data, static_cast<std::streamsize>(n));
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data += n;
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size -= n;
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} while (size != 0);
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}
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template <typename Char, typename T>
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void format_value(basic_buffer<Char> &buffer, const T &value) {
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internal::FormatBuf<Char> format_buf(buffer);
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std::basic_ostream<Char> output(&format_buf);
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output << value;
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buffer.resize(format_buf.size());
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}
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// Disable builtin formatting of enums and use operator<< instead.
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template <typename T>
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struct format_enum<T,
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typename std::enable_if<std::is_enum<T>::value>::type> : std::false_type {};
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} // namespace internal
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// Formats an object of type T that has an overloaded ostream operator<<.
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template <typename T, typename Char>
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struct formatter<T, Char,
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typename std::enable_if<!internal::format_type<T>::value>::type>
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: formatter<basic_string_view<Char>, Char> {
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template <typename Context>
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void format(const T &value, Context &ctx) {
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basic_memory_buffer<Char> buffer;
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internal::format_value(buffer, value);
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basic_string_view<Char> str(buffer.data(), buffer.size());
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formatter<basic_string_view<Char>, Char>::format(str, ctx);
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}
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};
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inline void vprint(std::ostream &os, string_view format_str, format_args args) {
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memory_buffer buffer;
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vformat_to(buffer, format_str, args);
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internal::write(os, buffer);
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}
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/**
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\rst
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Prints formatted data to the stream *os*.
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**Example**::
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print(cerr, "Don't {}!", "panic");
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\endrst
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*/
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template <typename... Args>
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inline void print(std::ostream &os, string_view format_str,
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const Args & ... args) {
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vprint(os, format_str, make_args(args...));
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}
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} // namespace fmt
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#endif // FMT_OSTREAM_H_
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