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Implement custom stream buffer (#92)

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Michael Kasperovich 2015-11-24 18:47:04 +03:00 committed by vitaut
parent 6cff6d8137
commit d266adf805
1 changed files with 53 additions and 3 deletions
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56
format.h
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@ -38,6 +38,7 @@
#include <stdexcept>
#include <string>
#include <map>
#include <ostream>
#ifndef FMT_USE_IOSTREAMS
# define FMT_USE_IOSTREAMS 1
@ -2087,6 +2088,11 @@ class BasicWriter {
*/
std::size_t size() const { return buffer_.size(); }
/**
Returns underlying buffer.
*/
Buffer<Char>& buffer() const { return buffer_; }
/**
Returns a pointer to the output buffer content. No terminating null
character is appended.
@ -2688,12 +2694,56 @@ class BasicArrayWriter : public BasicWriter<Char> {
typedef BasicArrayWriter<char> ArrayWriter;
typedef BasicArrayWriter<wchar_t> WArrayWriter;
template<class Elem, class Traits = std::char_traits<Elem> >
class basic_formatbuf : public std::basic_streambuf<Elem, Traits> {
typedef typename std::basic_streambuf<Elem, Traits>::int_type int_type;
typedef typename std::basic_streambuf<Elem, Traits>::traits_type traits_type;
using std::basic_streambuf<Elem, Traits>::setp;
using std::basic_streambuf<Elem, Traits>::pptr;
using std::basic_streambuf<Elem, Traits>::pbase;
Buffer<Elem>& buffer_;
Elem* start_;
public:
basic_formatbuf(Buffer<Elem>& buffer) : buffer_(buffer), start_(&buffer[0]) {
setp(start_, start_ + buffer_.capacity());
}
virtual int_type overflow(int_type _Meta = traits_type::eof()) {
if (!traits_type::eq_int_type(_Meta, traits_type::eof())) {
size_t size = pptr() - start_;
buffer_.resize(size);
buffer_.reserve(size * 2);
start_ = &buffer_[0];
start_[size] = traits_type::to_char_type(_Meta);
setp(start_+ size + 1, start_ + size * 2);
}
return _Meta;
}
size_t size() {
return pptr() - start_;
}
};
// Formats a value.
template <typename Char, typename T>
void format(BasicFormatter<Char> &f, const Char *&format_str, const T &value) {
std::basic_ostringstream<Char> os;
os << value;
std::basic_string<Char> str = os.str();
internal::MemoryBuffer<Char, internal::INLINE_BUFFER_SIZE> buffer;
basic_formatbuf<Char> format_buf(buffer);
std::basic_ostream<Char> output(&format_buf);
output << value;
BasicStringRef<Char> str(format_buf.size() > 0 ? &buffer[0] : 0, format_buf.size());
internal::Arg arg = internal::MakeValue<Char>(str);
arg.type = static_cast<internal::Arg::Type>(
internal::MakeValue<Char>::type(str));