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#include "kapi/cio.hpp"
#include <kstd/format>
#include <kstd/os/print.hpp>
#include <kstd/print>
#include <array>
#include <cstddef>
#include <iterator>
#include <string_view>
namespace kstd::os
{
namespace
{
struct write_buffer
{
using output_stream = teachos::cio::output_stream;
constexpr auto static size = 128uz;
write_buffer(write_buffer const &) = delete;
write_buffer(write_buffer &&) = delete;
auto operator=(write_buffer const &) -> write_buffer & = delete;
auto operator=(write_buffer &&) -> write_buffer & = delete;
explicit write_buffer(output_stream stream)
: m_stream{stream}
{}
~write_buffer() noexcept
{
flush();
}
auto flush() noexcept -> void
{
if (m_position > 0)
{
std::string_view chunk{m_buffer.data(), m_position};
teachos::cio::write(m_stream, chunk);
m_position = 0;
}
}
auto static callback(void * object, std::string_view text) -> void
{
auto * self = static_cast<write_buffer *>(object);
for (char const character : text)
{
if (self->m_position >= size)
{
self->flush();
}
self->m_buffer.at(self->m_position++) = character;
}
}
private:
output_stream m_stream;
std::array<char, size> m_buffer{};
std::size_t m_position{};
};
} // namespace
auto vprint(print_sink sink, std::string_view format, kstd::format_args args) -> void
{
auto writer = write_buffer{(sink == print_sink::stderr) ? teachos::cio::output_stream::stderr
: teachos::cio::output_stream::stdout};
auto context = kstd::format_context{.writer = write_buffer::callback, .user_data = &writer};
auto current = format.begin();
auto end = format.end();
auto next_automatic_index = 0uz;
while (current != end)
{
if (*current != '{')
{
auto start = current;
while (current != end && *current != '{')
{
std::advance(current, 1);
}
context.push(std::string_view(start, current - start));
continue;
}
if (std::next(current) != end && *(std::next(current)) == '{')
{
context.push('{');
std::advance(current, 2);
continue;
}
std::advance(current, 1);
auto index = 0uz;
if (current != end && *current >= '0' && *current <= '9')
{
while (current != end && *current >= '0' && *current <= '9')
{
index = index * 10 + static_cast<std::size_t>(*current - '0');
std::advance(current, 1);
}
}
else
{
index = next_automatic_index++;
}
auto remaining_fmt = std::string_view{current, static_cast<std::size_t>(std::distance(current, end))};
auto const arg = args.get(index);
if (arg.format)
{
auto const after_specs = arg.format(arg.value, remaining_fmt, context);
auto const consumed = remaining_fmt.size() - after_specs.size();
std::advance(current, consumed);
}
else
{
context.push("{?}");
while (current != end && *current != '}')
std::advance(current, 1);
}
if (current != end && *current == '}')
{
std::advance(current, 1);
}
else
{
context.push("{fmt-err}");
while (current != end && *current != '}')
std::advance(current, 1);
if (current != end)
std::advance(current, 1);
}
}
}
} // namespace kstd::os
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