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module;
#include <optional>
#include <string>
export module ttwhy.scanners:terminal_policies;
import :terminal_events;
import :terminal_concepts;
namespace ttwhy::scanners
{
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
export template<typename T>
using associated_terminal_policy_t = typename T::terminal_policy;
export struct ansi_policy
{
constexpr auto static resolve_vt220_keypad(std::string & buffer, ttwhy::ansi_sink auto & sink) -> void
{
if (buffer.empty())
{
return;
}
if (auto key = detail::map_vt220_keypad(buffer.front()))
{
sink(navigation_event{*key});
}
buffer.clear();
}
constexpr auto static resolve_vt100_cursor(char terminator, std::string &, ttwhy::ansi_sink auto & sink) -> void
{
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key});
}
}
constexpr auto static resolve_ss3(char terminator, ttwhy::ansi_sink auto & sink) -> void
{
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key});
}
}
};
export struct xterm_policy
{
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);
}
constexpr auto static resolve_vt220_keypad(std::string & buffer, ttwhy::ansi_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();
}
constexpr auto static resolve_vt100_cursor(char terminator, std::string & buffer, ttwhy::ansi_sink auto & sink)
-> void
{
auto modifiers = parse_modifiers(buffer);
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key, modifiers});
}
}
constexpr auto static resolve_ss3(char terminator, ttwhy::ansi_sink auto & sink) -> void
{
if (auto key = detail::map_vt100_cursor(terminator))
{
sink(navigation_event{*key});
}
}
};
} // namespace ttwhy::scanners
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