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module;
#include <optional>
#include <string>
export module ttwhy.terminal:policies;
import :events;
namespace ttwhy::terminal
{
namespace detail
{
constexpr auto map_vt220_keypad(char terminator) -> std::optional<navigation_key>
{
switch (terminator)
{
case '1':
case '7':
return navigation_key::home;
case '2':
return navigation_key::insert_key;
case '3':
return navigation_key::delete_key;
case '4':
case '8':
return navigation_key::end;
case '5':
return navigation_key::page_up;
case '6':
return navigation_key::page_down;
default:
return std::nullopt;
}
}
constexpr auto map_vt100_cursor(char terminator) -> std::optional<navigation_key>
{
switch (terminator)
{
case 'A':
return navigation_key::up;
case 'B':
return navigation_key::down;
case 'C':
return navigation_key::right;
case 'D':
return navigation_key::left;
case 'H':
return navigation_key::home;
case 'F':
return navigation_key::end;
default:
return std::nullopt;
}
}
} // namespace detail
//! Policy for decoding standard ANSI/VT escape sequences.
export struct ansi_policy
{
//! Resolve a VT220 keypad sequence and emit the corresponding navigation event.
//!
//! @param buffer The CSI parameter buffer.
//! @param sink The event sink to receive the resolved navigation event.
constexpr auto static resolve_vt220_keypad(std::string & buffer, event_sink auto & sink) -> void
{
if (buffer.empty())
{
return;
}
if (auto key = detail::map_vt220_keypad(buffer.front()))
{
sink(navigation_event{*key});
}
buffer.clear();
}
//! Resolve a VT100 cursor sequence and emit the corresponding navigation event.
//!
//! @param terminator The CSI terminator character indicating direction or key.
//! @param sink The event sink to receive the resolved navigation event.
constexpr auto static resolve_vt100_cursor(char terminator, std::string &, event_sink auto & sink) -> void
{
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key});
}
}
//! Resolve an SS3 single-shift sequence and emit the corresponding navigation event.
//!
//! @param terminator The SS3 terminator character indicating direction or key.
//! @param sink The event sink to receive the resolved navigation event.
constexpr auto static resolve_ss3(char terminator, event_sink auto & sink) -> void
{
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key});
}
}
};
//! Policy for decoding xterm escape sequences, including modifier parameters.
export struct xterm_policy
{
//! Parse keyboard modifier parameters from a CSI parameter buffer.
//!
//! @param buffer The CSI parameter buffer string view.
//! @return The parsed modifier set, or empty if none present.
constexpr auto static parse_modifiers(std::string_view buffer) -> modifier_set
{
auto delimiter = buffer.find(';');
if (delimiter == std::string_view::npos)
{
return {};
}
auto modifier_string = buffer.substr(delimiter + 1);
auto modifier_value = 0u;
for (auto character : modifier_string)
{
if (character >= '0' && character <= '9')
{
modifier_value = modifier_value * 10 + static_cast<unsigned int>(character - '0');
}
}
if (modifier_value <= 1)
{
return {};
}
return static_cast<modifier_set>(modifier_value - 1);
}
//! Resolve a VT220 keypad sequence with modifiers and emit the navigation event.
//!
//! @param buffer The CSI parameter buffer containing key and modifier values.
//! @param sink The event sink to receive the resolved navigation event.
constexpr auto static resolve_vt220_keypad(std::string & buffer, event_sink auto & sink) -> void
{
if (buffer.empty())
{
return;
}
auto modifiers = parse_modifiers(buffer);
if (auto key = detail::map_vt220_keypad(buffer.front()))
{
sink(navigation_event{*key, modifiers});
}
buffer.clear();
}
//! Resolve a VT100 cursor sequence with modifiers and emit the navigation event.
//!
//! @param terminator The CSI terminator character indicating direction or key.
//! @param buffer The CSI parameter buffer containing modifier values.
//! @param sink The event sink to receive the resolved navigation event.
constexpr auto static resolve_vt100_cursor(char terminator, std::string & buffer, event_sink auto & sink) -> void
{
auto modifiers = parse_modifiers(buffer);
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key, modifiers});
}
}
//! Resolve an SS3 single-shift sequence and emit the corresponding navigation event.
//!
//! @param terminator The SS3 terminator character indicating direction or key.
//! @param sink The event sink to receive the resolved navigation event.
constexpr auto static resolve_ss3(char terminator, event_sink auto & sink) -> void
{
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key});
}
}
};
} // namespace ttwhy::terminal
|
