✨ add comments.

src/ast/lexer.rs

@@ -231,6 +231,20 @@ impl Lexer {
             self.cursor += 1;
         }
     }
+
+    fn skip_comments(&mut self) {
+        while let Some('#') = self.text.chars().nth(self.cursor) {
+            loop {
+                if let Some('\n') 
+                = self.text.chars().nth(self.cursor) {
+                    break; 
+                }
+
+                self.cursor += 1;
+            }
+            self.skip_spaces();
+        } 
+    }
 }
 
 impl Iterator for Lexer {
@@ -238,6 +252,7 @@ impl Iterator for Lexer {
 
     fn next(&mut self) -> Option<Self::Item> {
         self.skip_spaces();
+        self.skip_comments();
 
         if let Some(token) = self.scan_keyword("true") {
             self.cursor = token.position;
@@ -388,4 +403,18 @@ mod test {
         
         Ok(())
     }
+
+    #[test]
+    fn test_comments() -> Result<(), error::AstError> {
+        let mut lex = Lexer::new();
+        
+        let res = lexer_run(&mut lex, 
+            " # aze \n 4 ")?;
+
+        assert_eq!(1, res.len());
+        assert_eq!(Node::Int(4),
+            *res.get(0).unwrap());
+        
+        Ok(())
+    }
 }