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.");
Stmt body = Statement();
if (increment != null)
{
body = new Stmt.Block(
new List <Stmt>(
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 List <Stmt>(
new[] { initializer, body }));
}
return(body);
}
public string VisitLiteralExpr(Expr.Literal expr)
{
var sb = new StringBuilder();
if (expr.Value == null)
{
sb.Append("nil");
return(sb.ToString());
}
sb.Append(expr.Value);
return(sb.ToString());
}
public object VisitLiteralExpr(Expr.Literal expr)
{
return(expr.Value);
}
public Nothing VisitLiteralExpr(Expr.Literal expr)
{
return(Nothing.AtAll);
}
