public object visitBlockStmt(Stmt.Block stmt) { executeBlock(stmt.statements, new LoxEnvironment(environment)); return(null); }
private Stmt ForStatement() { consume(TokenType.LEFT_PAREN, "Expect '(' after 'for'."); Stmt initializer; if (match(TokenType.SEMICOLON)) { initializer = null; } else if (match(TokenType.VAR)) { initializer = VarDeclaration(); } else { initializer = ExpressionStatement(); } Expr condition = null; if (!check(TokenType.SEMICOLON)) { condition = Expression(); } consume(TokenType.SEMICOLON, "Expect ';' after loop condition."); Expr increment = null; if (!check(TokenType.RIGHT_PAREN)) { increment = Expression(); } consume(TokenType.RIGHT_PAREN, "Expect ')' after for clauses."); Stmt body = Statement(); if (increment != null) { body = new Stmt.Block(new List <Stmt>() { body, new Stmt.Expression(increment) }); } if (condition == null) { condition = new Expr.Literal(true); } body = new Stmt.While(condition, body); if (initializer != null) { body = new Stmt.Block(new List <Stmt>() { initializer, body }); } return(body); }