Add booleans

src/interpreter.rs

@@ -18,6 +18,7 @@ pub fn interpret(ast: Program) {
                                     Literal::FloatLiteral(f) => {
                                         args.push(format!("{}.{}f", f.trunc(), f.fract()))
                                     }
+                                    Literal::BooleanLiteral(b) => args.push(format!("{}", b)),
                                 },
                                 Expression::Null => {
                                     args.push("null".to_owned());

src/parser.rs

@@ -90,6 +90,15 @@ fn parse_expression(tokens: &Vec<Token>, current: &mut usize) -> Expression {
         let out = Expression::Literal(Literal::FloatLiteral(val));
         *current += 1;
         out
+    } else if tokens[*current].kind == TokenKind::BooleanLiteral {
+        let mut val = false;
+        if tokens[*current].value == "true" {
+            val = true;
+        } else if tokens[*current].value == "false" {
+            val = false;
+        }
+        *current += 1;
+        Expression::Literal(Literal::BooleanLiteral(val))
     } else {
         Expression::Null
     }
@@ -114,4 +123,5 @@ pub enum Literal {
     StringLiteral(String),
     IntLiteral(i32),
     FloatLiteral(f32),
+    BooleanLiteral(bool),
 }

src/tokenizer.rs

@@ -4,6 +4,7 @@ pub enum TokenKind {
     StringLiteral,
     IntLiteral,
     FloatLiteral,
+    BooleanLiteral,
     LeftParen,
     RightParen,
     Semicolon,
@@ -77,8 +78,12 @@ fn read_identifier(chars: &Vec<char>, current: &mut usize, tokens: &mut Vec<Toke
             break;
         }
     }
+    let mut kind = TokenKind::Identifier;
+    if identifier == "true" || identifier == "false" {
+        kind = TokenKind::BooleanLiteral;
+    }
     tokens.push(Token {
-        kind: TokenKind::Identifier,
+        kind: kind,
         value: identifier,
         index: original_current,
     });

test.pvt

@@ -1,3 +1,7 @@
+log(2);
 log(5i);
 log(3f);
 log(2.5);
+log(true, false);
+log("Hello world!");
+log('Goodbye cruel world!')