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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 = kapi::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};
kapi::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) ? kapi::cio::output_stream::stderr
: kapi::cio::output_stream::stdout};
auto context = kstd::format_context{.writer = write_buffer::callback, .user_data = &writer, .args = args};
auto parse_context = kstd::format_parse_context{format, args.size()};
auto it = parse_context.begin();
auto end = parse_context.end();
while (it != end)
{
if (*it != '{' && *it != '}')
{
auto start = it;
while (it != end && *it != '{' && *it != '}')
{
std::advance(it, 1);
}
parse_context.advance_to(it);
context.push(std::string_view(start, it - start));
continue;
}
if (*it == '{')
{
std::advance(it, 1);
if (it != end && *it == '{')
{
context.push('{');
std::advance(it, 1);
parse_context.advance_to(it);
continue;
}
parse_context.advance_to(it);
auto index = 0uz;
if (it != end && *it >= '0' && *it <= '9')
{
while (it != end && *it >= '0' && *it <= '9')
{
index = index * 10 + static_cast<std::size_t>(*it - '0');
std::advance(it, 1);
}
parse_context.check_arg_id(index);
}
else
{
index = parse_context.next_arg_id();
}
if (it != end && *it == ':')
{
std::advance(it, 1);
}
parse_context.advance_to(it);
if (index < args.size())
{
auto const & arg = args[index];
switch (arg.type)
{
case kstd::bits::format::arg_type::boolean:
{
auto fmt = kstd::formatter<bool>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.boolean, context);
break;
}
case kstd::bits::format::arg_type::character:
{
auto fmt = kstd::formatter<char>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.character, context);
break;
}
case kstd::bits::format::arg_type::integer:
{
auto fmt = kstd::formatter<long long>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.integer, context);
break;
}
case kstd::bits::format::arg_type::unsigned_integer:
{
auto fmt = kstd::formatter<unsigned long long>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.unsigned_integer, context);
break;
}
case kstd::bits::format::arg_type::string_view:
{
auto fmt = kstd::formatter<std::string_view>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.string_view, context);
break;
}
case kstd::bits::format::arg_type::c_string:
{
auto fmt = kstd::formatter<char const *>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.c_string, context);
break;
}
case kstd::bits::format::arg_type::pointer:
{
auto fmt = kstd::formatter<void const *>{};
auto const parsed = fmt.parse(parse_context);
parse_context.advance_to(parsed);
fmt.format(arg.value.pointer, context);
break;
}
case kstd::bits::format::arg_type::user_defined:
{
if (arg.value.user_defined.format)
{
arg.value.user_defined.format(arg.value.user_defined.pointer, parse_context, context);
}
else
{
context.push("{?}");
}
break;
}
default:
{
context.push("{fmt-err: unknown-type}");
break;
}
}
}
else
{
context.push("{fmt-err: bound}");
}
it = parse_context.begin();
if (it != end && *it == '}')
{
std::advance(it, 1);
parse_context.advance_to(it);
}
else
{
context.push("{fmt-err: unconsumed}");
while (it != end && *it != '}')
{
std::advance(it, 1);
}
if (it != end)
{
std::advance(it, 1);
parse_context.advance_to(it);
}
}
}
else if (*it == '}')
{
std::advance(it, 1);
if (it != end && *it == '}')
{
context.push('}');
std::advance(it, 1);
parse_context.advance_to(it);
}
else
{
context.push("{fmt-err: unescaped}");
parse_context.advance_to(it);
}
}
}
}
} // namespace kstd::os
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