Add comments between two #

src/ast/parser.rs

@@ -23,6 +23,7 @@ impl Parser {
     fn _parse(&self, index: Option<usize>, stop_char: Option<char>) -> (Vec<Instruction>, usize) {
         let mut index = index.unwrap_or(0);
         let mut instructions = vec![];
+        let mut comment = false;
 
         while index < self.program.len() {
             let char = match self.program.chars().nth(index) {
@@ -33,6 +34,15 @@ impl Parser {
                 return (instructions, index);
             }
 
+            if char == '#' {
+                comment = !comment;
+            }
+
+            if comment {
+                index += 1;
+                continue;
+            }
+
             match char {
                 '+' => instructions.push(Instruction::new(InstructionType::Increment, None)),
                 '-' => instructions.push(Instruction::new(InstructionType::Decrement, None)),

src/evaluation/evaluator.rs

@@ -220,4 +220,14 @@ mod tests {
         let mut evaluator = Evaluator::new(instructions);
         evaluator.evaluate(None, Some(false));
     }
+
+    #[test]
+    fn test_comments() {
+        let program = String::from("++++++[>++++++++<-]>#+#.");
+        let mut parser = ast::Parser::new(program);
+        let instructions = parser.parse();
+        let mut evaluator = Evaluator::new(instructions);
+        evaluator.evaluate(None, Some(false));
+        assert_eq!(String::from_utf8(evaluator.output_buffer).unwrap(), "0");
+    }
 }