lib: add xterm policy

1 files changed, 27 insertions, 0 deletions

diff --git a/ttwhy/scanners/terminal_concepts.cppm b/ttwhy/scanners/terminal_concepts.cppm
new file mode 100644
index 0000000..e82a8d0
--- /dev/null
+++ b/ttwhy/scanners/terminal_concepts.cppm
@@ -0,0 +1,27 @@
+module;
+
+#include <concepts>
+#include <span>
+
+export module ttwhy.scanners:terminal_concepts;
+
+import :terminal_events;
+
+namespace ttwhy
+{
+
+  export template<typename Candidate>
+  concept scanner = requires(Candidate a, std::span<char const> buffer) {
+    { a.process(buffer) } -> std::same_as<void>;
+    { a.timeout() } -> std::same_as<void>;
+    { a.is_pending() } -> std::same_as<bool>;
+  };
+
+  export template<typename Sink>
+  concept ansi_sink = requires(Sink sink) {
+    { sink(std::declval<ttwhy::scanners::character_event>()) } -> std::same_as<void>;
+    { sink(std::declval<ttwhy::scanners::control_event>()) } -> std::same_as<void>;
+    { sink(std::declval<ttwhy::scanners::navigation_event>()) } -> std::same_as<void>;
+  };
+
+}  // namespace ttwhy