/// <summary>
/// Creates a matching for type cast expressions.
/// </summary>
/// <param name="srcType">source type</param>
/// <param name="dstType">destination type</param>
public Matching Cast(Type srcType, TypeDescriptor dstType)
{
var cast = IntrinsicFunctions.Cast((Expression)null, srcType, dstType);
Matching newm = new Matching();
newm._func = e => e.NodeEquals(cast) &&
this.Match(e.Children.ElementAt(0));
newm._gen = () => newm._expr == null?
IntrinsicFunctions.Cast(_gen(), srcType, dstType) :
newm._expr;
return(newm);
}
private static Expression ToExpression(object arg)
{
if (arg is Expression)
{
var ex = (Expression)arg;
if (ex.ResultType.CILType.Equals(typeof(string)))
{
return(ex);
}
else
{
return(IntrinsicFunctions.Cast(ex, ex.ResultType.CILType, typeof(string)));
}
}
else if (arg is ILiteral)
{
return(ToExpression(new LiteralReference((ILiteral)arg)));
}
else
{
return(LiteralReference.CreateConstant(arg.ToString()));
}
}