void Evaluate(string expression_str, Expression expr, string label)
{
EvalContext ctx = new EvalContext();
ctx.SetVariable("x", "XXX");
ctx.SetVariable("y", "YYY");
ctx.SetVariable("true", "SSS");
SafeEvalContext safe_ctx = new SafeEvalContext(ctx);
Value v = expr.Evaluate(safe_ctx);
Console.WriteLine("{0}: {1}", label, v.ToString());
List <Variable> unresolved_variables = expr.CollectUnresolvedVariables(ctx);
if (unresolved_variables.Count > 0)
{
Console.WriteLine("Unresolved variables in the expression: {0}", unresolved_variables.Count);
Console.WriteLine(expression_str);
foreach (Variable var in unresolved_variables)
{
Console.WriteLine(new string(' ', var.Position) + "^");
Console.WriteLine(new string(' ', var.Position) + var.Name);
}
}
}
public List <Variable> CollectUnresolvedVariables(IEvalContext ctx)
{
Debug.Assert(!(ctx is SafeEvalContext));
Private.UnresolvedVariableCollectorEvalContext uvc_ctx = new Private.UnresolvedVariableCollectorEvalContext(ctx);
SafeEvalContext safe_ctx = new SafeEvalContext(uvc_ctx);
RecursiveCollectUnresolvedVariables(safe_ctx);
return(uvc_ctx.UnresolvedVariables);
}