private Stmt ForStatement() { Consume(LEFT_PAREN, "Expected '(' after 'for'."); Stmt initializer; if (Match(SEMICOLON)) { initializer = null; } else if (Match(VAR)) { initializer = VarDeclaration(); } else { initializer = ExpressionStatement(); } Expr condition = null; if (!Check(SEMICOLON)) { condition = Expression(); } Consume(SEMICOLON, "Expected ';' after loop condition."); Expr increment = null; if (!Check(RIGHT_PAREN)) { increment = Expression(); } Consume(RIGHT_PAREN, "Expected ')' after for clauses."); var 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); }
public string VisitWhileStmt(Stmt.While stmt) { return(Parenthesize2("while", stmt.Condition, stmt.Body)); }
public object VisitWhileStmt(Stmt.While stmt) { Resolve(stmt.Condition); Resolve(stmt.Body); return(null); }