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