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#ifndef _C4_YML_WRITER_HPP_
#define _C4_YML_WRITER_HPP_
#ifndef _C4_YML_COMMON_HPP_
#include "./common.hpp"
#endif
#include <c4/substr.hpp>
#include <stdio.h> // fwrite(), fputc()
#include <string.h> // memcpy()
namespace c4 {
namespace yml {
/** Repeat-Character: a character to be written a number of times. */
struct RepC
{
char c;
size_t num_times;
};
inline RepC indent_to(size_t num_levels)
{
return {' ', size_t(2) * num_levels};
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/** A writer that outputs to a file. Defaults to stdout. */
struct WriterFile
{
FILE * m_file;
size_t m_pos;
WriterFile(FILE *f = nullptr) : m_file(f ? f : stdout), m_pos(0) {}
inline substr _get(bool /*error_on_excess*/)
{
substr sp;
sp.str = nullptr;
sp.len = m_pos;
return sp;
}
template<size_t N>
inline void _do_write(const char (&a)[N])
{
fwrite(a, sizeof(char), N - 1, m_file);
m_pos += N - 1;
}
inline void _do_write(csubstr sp)
{
#if defined(__clang__)
# pragma clang diagnostic push
# pragma GCC diagnostic ignored "-Wsign-conversion"
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
if(sp.empty()) return;
fwrite(sp.str, sizeof(csubstr::char_type), sp.len, m_file);
m_pos += sp.len;
#if defined(__clang__)
# pragma clang diagnostic pop
#elif defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
}
inline void _do_write(const char c)
{
fputc(c, m_file);
++m_pos;
}
inline void _do_write(RepC const rc)
{
for(size_t i = 0; i < rc.num_times; ++i)
{
fputc(rc.c, m_file);
}
m_pos += rc.num_times;
}
};
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/** A writer that outputs to an STL-like ostream. */
template<class OStream>
struct WriterOStream
{
OStream& m_stream;
size_t m_pos;
WriterOStream(OStream &s) : m_stream(s), m_pos(0) {}
inline substr _get(bool /*error_on_excess*/)
{
substr sp;
sp.str = nullptr;
sp.len = m_pos;
return sp;
}
template<size_t N>
inline void _do_write(const char (&a)[N])
{
m_stream.write(a, N - 1);
m_pos += N - 1;
}
inline void _do_write(csubstr sp)
{
#if defined(__clang__)
# pragma clang diagnostic push
# pragma GCC diagnostic ignored "-Wsign-conversion"
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
if(sp.empty()) return;
m_stream.write(sp.str, sp.len);
m_pos += sp.len;
#if defined(__clang__)
# pragma clang diagnostic pop
#elif defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
}
inline void _do_write(const char c)
{
m_stream.put(c);
++m_pos;
}
inline void _do_write(RepC const rc)
{
for(size_t i = 0; i < rc.num_times; ++i)
{
m_stream.put(rc.c);
}
m_pos += rc.num_times;
}
};
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/** a writer to a substr */
struct WriterBuf
{
substr m_buf;
size_t m_pos;
WriterBuf(substr sp) : m_buf(sp), m_pos(0) {}
inline substr _get(bool error_on_excess)
{
if(m_pos <= m_buf.len)
{
return m_buf.first(m_pos);
}
if(error_on_excess)
{
c4::yml::error("not enough space in the given buffer");
}
substr sp;
sp.str = nullptr;
sp.len = m_pos;
return sp;
}
template<size_t N>
inline void _do_write(const char (&a)[N])
{
RYML_ASSERT( ! m_buf.overlaps(a));
if(m_pos + N-1 <= m_buf.len)
{
memcpy(&(m_buf[m_pos]), a, N-1);
}
m_pos += N-1;
}
inline void _do_write(csubstr sp)
{
if(sp.empty()) return;
RYML_ASSERT( ! sp.overlaps(m_buf));
if(m_pos + sp.len <= m_buf.len)
{
memcpy(&(m_buf[m_pos]), sp.str, sp.len);
}
m_pos += sp.len;
}
inline void _do_write(const char c)
{
if(m_pos + 1 <= m_buf.len)
{
m_buf[m_pos] = c;
}
++m_pos;
}
inline void _do_write(RepC const rc)
{
if(m_pos + rc.num_times <= m_buf.len)
{
for(size_t i = 0; i < rc.num_times; ++i)
{
m_buf[m_pos + i] = rc.c;
}
}
m_pos += rc.num_times;
}
};
} // namespace yml
} // namespace c4
#endif /* _C4_YML_WRITER_HPP_ */
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