private Stmt forStatement()
{
consume(LEFT_PAREN, "Expect '(' 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, "Expect ';' after loop condition.");
Expr increment = null;
if (!check(RIGHT_PAREN))
{
increment = expression();
}
consume(RIGHT_PAREN, "Expect '(' after for clauses.");
var body = statement();
if (increment != null)
{
body = new Stmt.Block(new[] { 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[] { initializer, body });
}
return(body);
}
public object visitLiteralExpr(Expr.Literal expr)
{
return(expr.value);
}
public object visitLiteralExpr(Expr.Literal expr) => null;
