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module;
#include <algorithm>
#include <boost/sml.hpp>
#include <cctype>
#include <span>
#include <vector>
export module ttwhy:scanner;
import :event;
namespace ttwhy::detail
{
/// Events
struct byte_received
{
char value;
};
/// States
auto const idle = boost::sml::state<class idle>;
auto const escape_sequence = boost::sml::state<class escape_sequence>;
auto const csi_sequence = boost::sml::state<class csi_sequence>;
/// Actions
auto push_character = [](byte_received const & event, std::vector<input_event> & queue) {
queue.push_back(character_event{event.value});
};
auto push_backspace = [](std::vector<input_event> & queue) {
queue.push_back(control_event{control_key::backspace});
};
auto push_delete = [](std::vector<input_event> & queue) {
queue.push_back(navigation_event{navigation_key::delete_key});
};
auto fallback_escape = [](byte_received const & event, std::vector<input_event> & queue) {
queue.push_back(control_event{control_key::escape});
if (event.value >= 0x20 && event.value <= 0x7e)
{
queue.push_back(character_event{event.value});
}
};
/// Guards
auto is_backspace = [](byte_received e) {
return e.value == '\x08' || e.value == '\x7f';
};
auto is_escape = [](byte_received e) {
return e.value == '\x1b';
};
auto is_printable = [](byte_received e) {
return e.value >= 0x20 && e.value <= 0x7e;
};
auto is_csi_introducer = [](byte_received e) {
return e.value == '[';
};
auto is_csi_param = [](byte_received e) {
return e.value >= 0x20 && e.value <= 0x3f;
};
auto is_csi_terminator = [](byte_received e) {
return e.value >= 0x40 && e.value <= 0x7e;
};
auto is_tilde = [](byte_received e) {
return e.value == '~';
};
/// Transitions
struct transition_table
{
auto operator()() const noexcept
{
using namespace boost::sml;
// clang-format off
return make_transition_table(
*idle + event<byte_received>[is_escape] = escape_sequence,
idle + event<byte_received>[is_backspace] / push_backspace = idle,
idle + event<byte_received>[is_printable] / push_character = idle,
escape_sequence + event<byte_received>[is_csi_introducer] = csi_sequence,
escape_sequence + event<byte_received>[!is_csi_introducer] / fallback_escape = idle,
csi_sequence + event<byte_received>[is_csi_param] = csi_sequence,
csi_sequence + event<byte_received>[is_tilde] / push_delete = idle,
csi_sequence + event<byte_received>[is_csi_terminator] = idle
);
// clang-format on
}
};
} // namespace ttwhy::detail
export namespace ttwhy
{
struct ansi_scanner
{
explicit ansi_scanner(std::vector<input_event> & queue)
: m_state_machine{queue}
{}
auto process(std::span<char const> buffer) -> void
{
std::ranges::for_each(buffer, [&](auto byte) { m_state_machine.process_event(detail::byte_received{byte}); });
}
private:
boost::sml::sm<detail::transition_table> m_state_machine;
};
} // namespace ttwhy
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