public DekiScriptExpression Visit(DekiScriptAccess expr, DekiScriptExpressionEvaluationState state)
{
DekiScriptExpression prefix = expr.Prefix.VisitWith(this, state);
DekiScriptExpression index = expr.Index.VisitWith(this, state);
DekiScriptAccess access = (DekiScriptAccess)DekiScriptExpression.Access(expr.Location, prefix, index);
if ((prefix is DekiScriptLiteral) && (index is DekiScriptLiteral))
{
DekiScriptLiteral result = DekiScriptExpressionEvaluation.Instance.Evaluate(access, state, false);
// check if result is a property
if (DekiScriptRuntime.IsProperty(result))
{
// retrieve property information
var descriptor = state.Runtime.ResolveRegisteredFunctionUri(((DekiScriptUri)result).Value);
if ((descriptor != null) && descriptor.IsIdempotent)
{
// evaluate property, since it never changes
return(state.Runtime.EvaluateProperty(expr.Location, result, state.Env));
}
return(DekiScriptExpression.Call(expr.Location, result, new DekiScriptList()));
}
return(result);
}
return(access);
}
private static object Eval(object value, DekiScriptRuntime runtime)
{
if (value is XUri)
{
DekiScriptLiteral uri = DekiScriptExpression.Constant((XUri)value);
if (DekiScriptRuntime.IsProperty(uri))
{
value = runtime.EvaluateProperty(Location.None, uri, runtime.CreateEnv()).NativeValue;
}
}
return(value);
}
public DekiScriptExpression Visit(DekiScriptAccess expr, DekiScriptOptimizerState state)
{
DekiScriptExpression prefix = expr.Prefix.VisitWith(this, state);
DekiScriptExpression index = expr.Index.VisitWith(this, state);
DekiScriptAccess access = new DekiScriptAccess(expr.Line, expr.Column, prefix, index);
if ((prefix is DekiScriptLiteral) && (index is DekiScriptLiteral))
{
// BUGBUGBUG (steveb): don't eval properties!
DekiScriptLiteral result = DekiScriptExpressionEvaluation.Instance.Evaluate(access, state.Env, false);
// check if result is a property
if (DekiScriptRuntime.IsProperty(result))
{
// retrieve property information
DekiScriptFunction function;
if (DekiScriptLibrary.Functions.TryGetValue(((DekiScriptUri)result).Value, out function))
{
if (function is DekiScriptFunctionNative)
{
DekiScriptFunctionNative native = (DekiScriptFunctionNative)function;
// check if function is idempotent; if so, execute it
if (native.IsIdempotent)
{
// evaluate property, since it never changes
return(DekiScriptRuntime.EvaluateProperty(result, state.Env));
}
}
}
return(new DekiScriptCall(expr.Line, expr.Column, result, new DekiScriptList(), false));
}
return(result);
}
return(access);
}