} // ctor
public override DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
{
// defer the target, to get the type
if (!target.HasValue)
{
return(Defer(target));
}
if (target.Value == null)
{
return(errorSuggestion ??
new DynamicMetaObject(
ThrowExpression(Properties.Resources.rsNullReference, ReturnType),
target.Restrictions.Merge(BindingRestrictions.GetInstanceRestriction(target.Expression, null))
));
}
else
{
// try to bind the member
Expression expr;
try
{
expr = EnsureType(LuaEmit.GetMember(lua, target.Expression, target.LimitType, Name, IgnoreCase, false), ReturnType);
/*
* Fallback-Calls
* first it get calls with no error suggestion -> return the default value
* second call is to create a bind expression again, with the default value suggest
* Example: DynamicObject - creates something like
*
* fallback(TryGetMember(binder, out result) ? result : fallback(null));
*
*/
if (expr.NodeType == ExpressionType.Default && errorSuggestion != null)
{
return(errorSuggestion);
}
}
catch (LuaEmitException e)
{
if (errorSuggestion != null)
{
return(errorSuggestion);
}
expr = ThrowExpression(e.Message, ReturnType);
}
// restrictions
var restrictions = target.Restrictions.Merge(BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType));
return(new DynamicMetaObject(expr, restrictions));
}
} // func FallbackGetMember
} // ctor
public override DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
{
// defer the target, to get the type
if (!target.HasValue)
{
return(Defer(target));
}
if (target.Value == null)
{
return(errorSuggestion ??
new DynamicMetaObject(
ThrowExpression(Properties.Resources.rsNullReference, ReturnType),
target.Restrictions.Merge(BindingRestrictions.GetInstanceRestriction(target.Expression, null))
));
}
else
{
// try to bind the member
Expression expr;
try
{
expr = EnsureType(LuaEmit.GetMember(lua, target.Expression, target.LimitType, Name, IgnoreCase, false), ReturnType);
}
catch (LuaEmitException e)
{
if (errorSuggestion != null)
{
return(errorSuggestion);
}
expr = ThrowExpression(e.Message, ReturnType);
}
// restrictions
var restrictions = target.Restrictions.Merge(BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType));
return(new DynamicMetaObject(expr, restrictions));
}
} // func FallbackGetMember
} // func MemberGetSandbox
private static Expression MemberGetExpression(Scope scope, Token tStart, Expression instance, string sMember)
{
return(MemberGetSandbox(scope, SafeExpression(() => LuaEmit.GetMember(scope.Runtime, instance, instance.Type, sMember, false, true), tStart), instance, sMember));
} // func MemberGetExpression
