1 files changed, 114 insertions, 0 deletions
diff --git a/vendor/vte/src/definitions.rs b/vendor/vte/src/definitions.rs
new file mode 100644
index 0000000..fe7952d
--- /dev/null
+++ b/vendor/vte/src/definitions.rs
@@ -0,0 +1,114 @@
+use core::mem;
+
+#[allow(dead_code)]
+#[derive(Debug, Copy, Clone)]
+pub enum State {
+    Anywhere = 0,
+    CsiEntry = 1,
+    CsiIgnore = 2,
+    CsiIntermediate = 3,
+    CsiParam = 4,
+    DcsEntry = 5,
+    DcsIgnore = 6,
+    DcsIntermediate = 7,
+    DcsParam = 8,
+    DcsPassthrough = 9,
+    Escape = 10,
+    EscapeIntermediate = 11,
+    Ground = 12,
+    OscString = 13,
+    SosPmApcString = 14,
+    Utf8 = 15,
+}
+
+impl Default for State {
+    fn default() -> State {
+        State::Ground
+    }
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, Copy)]
+pub enum Action {
+    None = 0,
+    Clear = 1,
+    Collect = 2,
+    CsiDispatch = 3,
+    EscDispatch = 4,
+    Execute = 5,
+    Hook = 6,
+    Ignore = 7,
+    OscEnd = 8,
+    OscPut = 9,
+    OscStart = 10,
+    Param = 11,
+    Print = 12,
+    Put = 13,
+    Unhook = 14,
+    BeginUtf8 = 15,
+}
+
+/// Unpack a u8 into a State and Action
+///
+/// The implementation of this assumes that there are *precisely* 16 variants for both Action and
+/// State. Furthermore, it assumes that the enums are tag-only; that is, there is no data in any
+/// variant.
+///
+/// Bad things will happen if those invariants are violated.
+#[inline(always)]
+pub fn unpack(delta: u8) -> (State, Action) {
+    unsafe {
+        (
+            // State is stored in bottom 4 bits
+            mem::transmute(delta & 0x0f),
+            // Action is stored in top 4 bits
+            mem::transmute(delta >> 4),
+        )
+    }
+}
+
+#[inline(always)]
+pub const fn pack(state: State, action: Action) -> u8 {
+    (action as u8) << 4 | state as u8
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn unpack_state_action() {
+        match unpack(0xee) {
+            (State::SosPmApcString, Action::Unhook) => (),
+            _ => panic!("unpack failed"),
+        }
+
+        match unpack(0x0f) {
+            (State::Utf8, Action::None) => (),
+            _ => panic!("unpack failed"),
+        }
+
+        match unpack(0xff) {
+            (State::Utf8, Action::BeginUtf8) => (),
+            _ => panic!("unpack failed"),
+        }
+    }
+
+    #[test]
+    fn pack_state_action() {
+        match unpack(0xee) {
+            (State::SosPmApcString, Action::Unhook) => (),
+            _ => panic!("unpack failed"),
+        }
+
+        match unpack(0x0f) {
+            (State::Utf8, Action::None) => (),
+            _ => panic!("unpack failed"),
+        }
+
+        match unpack(0xff) {
+            (State::Utf8, Action::BeginUtf8) => (),
+            _ => panic!("unpack failed"),
+        }
+    }
+}