public FullTrustEvaluationStrategy(string expression, VsaEngine engine)
: base(engine)
{
//
// Equivalent to following in JScript:
// new Function('$context', 'with ($context) return (' + expression + ')');
//
// IMPORTANT! Leave the closing parentheses surrounding the
// return expression on a separate line. This is to guard
// against someone using a double-slash (//) to comment out
// the remainder of an expression.
//
const string context = "$context";
_function = LateBinding.CallValue(
DefaultThisObject(engine),
engine.LenientGlobalObject.Function,
new object[] {
/* parameters */ context + ",$", /* body... */ @"
with (" + context + @") {
return (
" + expression + @"
);
}"
},
/* construct */ true, /* brackets */ false, engine);
}
public override bool Eval(object context)
{
//
// Following is equivalent to calling apply in JScript.
// See http://msdn.microsoft.com/en-us/library/84ht5z59.aspx.
//
object result = LateBinding.CallValue(
DefaultThisObject(Engine),
_function, /* args */ new object[] { context, context },
/* construct */ false, /* brackets */ false, Engine);
return(Convert.ToBoolean(result));
}
