lib: add xterm policy

1 files changed, 100 insertions, 0 deletions

diff --git a/ttwhy/scanners/terminal_events.cppm b/ttwhy/scanners/terminal_events.cppm
new file mode 100644
index 0000000..3e4c849
--- /dev/null
+++ b/ttwhy/scanners/terminal_events.cppm
@@ -0,0 +1,100 @@
+module;
+
+#include <cstdint>
+#include <utility>
+#include <variant>
+
+export module ttwhy.scanners:terminal_events;
+
+export namespace ttwhy::scanners
+{
+  enum struct control_key : std::uint8_t
+  {
+    enter,
+    escape,
+    tab,
+    backspace,
+  };
+
+  enum struct navigation_key : std::uint8_t
+  {
+    up,
+    down,
+    left,
+    right,
+    home,
+    end,
+    delete_key,
+    insert_key,
+    page_up,
+    page_down,
+  };
+
+  enum struct modifier : std::uint8_t
+  {
+    none = 0,
+    shift = 1,
+    alt = 2,
+    ctrl = 4,
+    meta = 8,
+  };
+
+  enum struct modifier_set : std::uint8_t
+  {
+  };
+
+  constexpr auto operator|(modifier lhs, modifier rhs) -> modifier_set
+  {
+    return static_cast<modifier_set>(std::to_underlying(lhs) | std::to_underlying(rhs));
+  }
+
+  constexpr auto operator|(modifier_set lhs, modifier rhs) -> modifier_set
+  {
+    return static_cast<modifier_set>(std::to_underlying(lhs) | std::to_underlying(rhs));
+  }
+
+  constexpr auto operator&(modifier lhs, modifier rhs) -> modifier_set
+  {
+    return static_cast<modifier_set>(std::to_underlying(lhs) & std::to_underlying(rhs));
+  }
+
+  constexpr auto operator&(modifier_set lhs, modifier rhs) -> modifier_set
+  {
+    return static_cast<modifier_set>(std::to_underlying(lhs) & std::to_underlying(rhs));
+  }
+
+  template<std::same_as<modifier>... Modifier>
+  constexpr auto has_all(modifier_set mask, Modifier... flag) -> bool
+  {
+    return (true && ... && (mask & flag));
+  }
+
+  template<std::same_as<modifier>... Modifier>
+  constexpr auto has_any(modifier_set mask, Modifier... flag) -> bool
+  {
+    return (false || ... || (mask & flag));
+  }
+
+  struct character_event
+  {
+    char value{};
+  };
+
+  struct control_event
+  {
+    control_key key{};
+  };
+
+  struct navigation_event
+  {
+    navigation_key key{};
+    modifier_set modifiers{};
+  };
+
+  struct ctrl_chord_event
+  {
+    char key{};
+  };
+
+  using input_event = std::variant<character_event, control_event, navigation_event, ctrl_chord_event>;
+}  // namespace ttwhy::scanners