public static TreeNode Compare(EvaluatorBase evaluator, TreeNode a, TreeNode b)
{
TreeNode arg_a = evaluator.Evaluate(a);
TreeNode arg_b = evaluator.Evaluate(b);
if (arg_a.GetType() != arg_b.GetType())
{
throw new ArgumentException("arguments must be of the same type to compare");
}
int result = 0;
if (arg_a is IntLiteral)
{
result = (arg_a as IntLiteral).Value.CompareTo(
(arg_b as IntLiteral).Value);
}
else if (arg_a is DoubleLiteral)
{
result = (arg_a as DoubleLiteral).Value.CompareTo(
(arg_b as DoubleLiteral).Value);
}
else if (arg_a is StringLiteral)
{
result = (arg_a as StringLiteral).Value.CompareTo(
(arg_b as StringLiteral).Value);
}
else if (arg_a is BooleanLiteral)
{
result = (arg_a as BooleanLiteral).Value.CompareTo(
(arg_b as BooleanLiteral).Value);
}
else
{
throw new ArgumentException("invalid type for comparison");
}
return(new IntLiteral(result));
}
public EvaluationException(TreeNode node, string token, Exception inner) : base(string.Format(
"Evaluation exception at token `{0} ({1})' [{2},{3}]",
node.GetType(), token, node.Line, node.Column), inner)
{
}
public EvaluationException(TreeNode node, string token, Exception inner) : base(String.Format(
"Evaluation exception at token `{0} ({1})' [{2},{3}]",
node.GetType(), token, node.Line, node.Column), inner)
{
}