Move the lexer to its own sibillexer module

Lots of failing tests right now, unfortunately. :(

lexer/src/named_char.rs

@@ -0,0 +1,45 @@
+/* lexer/src/named_char.rs
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+use std::collections::HashSet;
+use sibiltypes::Char;
+
+const ALARM: &'static str = "alarm";
+const BACKSPACE: &'static str = "backspace";
+const DELETE: &'static str = "delete";
+const ESCAPE: &'static str = "escape";
+const NEWLINE: &'static str = "newline";
+const NULL: &'static str = "null";
+const RETURN: &'static str = "return";
+const SPACE: &'static str = "space";
+const TAB: &'static str = "tab";
+
+pub fn set() -> HashSet<&'static str> {
+    let mut set: HashSet<&'static str> = HashSet::new();
+    set.insert(ALARM);
+    set.insert(BACKSPACE);
+    set.insert(DELETE);
+    set.insert(ESCAPE);
+    set.insert(NEWLINE);
+    set.insert(NULL);
+    set.insert(RETURN);
+    set.insert(SPACE);
+    set.insert(TAB);
+    set
+}
+
+pub fn char_named_by(named: &str) -> Char {
+    Char(match named {
+        ALARM => '\x07',
+        BACKSPACE => '\x08',
+        DELETE => '\x7F',
+        ESCAPE => '\x1B',
+        NEWLINE => '\n',
+        NULL => '\0',
+        RETURN => '\r',
+        SPACE => ' ',
+        TAB => '\t',
+        _ => panic!("char_named_by called with invalid named char string")
+    })
+}