Escaping the escape character

src/enums.rs

@@ -4,6 +4,7 @@ mod tests;
 ///The following are the implemented ANSI escape sequences. More to be added.
 #[derive(Debug, PartialEq)]
 pub enum AnsiSequence {
+    Escape,
     CursorPos(u32, u32),
     CursorUp(u32),
     CursorDown(u32),
@@ -61,6 +62,7 @@ impl Display for AnsiSequence {
         
         use AnsiSequence::*;
         match self {
+            Escape => write!(formatter, "\u{1b}"),
             CursorPos(line, col) 
                 => write!(formatter, "[{};{}H", line, col),
             CursorUp(amt)

src/parsers.rs

@@ -51,6 +51,14 @@ named!(
     )
 );
 
+named!(
+    escape<&str, AnsiSequence>,
+    do_parse!(
+        tag!("\u{1b}") >>
+        (AnsiSequence::Escape)
+    )
+);
+
 named!(
     cursor_up<&str, AnsiSequence>,
     do_parse!(
@@ -244,7 +252,8 @@ tag_parser!(set_single_shift3, "O", AnsiSequence::SetSingleShift3);
 named!(
     combined<&str, AnsiSequence>,
     alt!(
-          cursor_pos
+          escape
+        | cursor_pos
         | cursor_up
         | cursor_down
         | cursor_forward

src/parsers/tests.rs

@@ -133,3 +133,15 @@ fn test_default_value() {
     assert_eq!(strings[3], Output::TextBlock("\x1b[7asd;1234H"));
     assert_eq!(strings[4], Output::TextBlock("\x1b[a;sd7H"));
 }
+
+#[test]
+fn test_escape() {
+    let parts: Vec<_> = "\x1b\x1b[33mFoobar".ansi_parse().collect();
+    assert_eq!(
+        parts,
+        vec![
+            Output::Escape(AnsiSequence::Escape),
+            Output::TextBlock("[33mFoobar")
+        ]
+    );
+}