private DynamicMetaObject /*!*/ FallbackInvokeMember(DynamicMetaObject target /*!*/, DynamicMetaObject /*!*/[] /*!*/ args)
{
// determine run time values and additional restrictions:
DTypeDesc classContext = this._classContext;
string fieldName = this._fieldName;
BindingRestrictions restrictions = BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType); //target.Restrictions;
int currentArg = 0;
if (!ClassContextIsKnown)
{
Debug.Assert(args.Length > currentArg, "Not enough arguments!");
Debug.Assert(args[currentArg].Value == null || Types.DTypeDesc[0].IsAssignableFrom(args[currentArg].LimitType), "Wrong class context type!");
classContext = (DTypeDesc)args[currentArg].Value;
Debug.Assert(classContext == null || !classContext.IsUnknown, "Class context should be known at run time!");
restrictions = restrictions.Merge(BindingRestrictions.GetInstanceRestriction(args[currentArg].Expression, classContext));
currentArg++;
}
if (IsIndirect)
{
Debug.Assert(args.Length > currentArg, "Not enough arguments!");
Debug.Assert(Types.String[0].IsAssignableFrom(args[currentArg].LimitType), "Wrong field name type!");
fieldName = (string)args[currentArg].Value;
restrictions = restrictions.Merge(
BindingRestrictions.GetExpressionRestriction(
Expression.Equal(
args[currentArg].Expression,
Expression.Constant(fieldName, Types.String[0]))));
currentArg++;
}
//
////Debug.Assert(!(var is PhpReference) && name != null);
Debug.Assert(target.HasValue && target.LimitType != Types.PhpReference[0], "Target should not be PhpReference!");
////if (ReferenceEquals(obj, ScriptContext.SetterChainSingletonObject))
////{
//// ScriptContext.CurrentContext.AbortSetterChain(false);
//// return new PhpReference();
////}
if (WantReference && ReferenceEquals(target.Value, ScriptContext.SetterChainSingletonObject))
{
// GetObjectPropertyRef:
Func <PhpReference> abortSetterChain = () =>
{
ScriptContext.CurrentContext.AbortSetterChain(false);
return(new PhpReference());
};
return(new DynamicMetaObject(
Expression.Call(abortSetterChain.Method),
BindingRestrictions.GetInstanceRestriction(target.Expression, ScriptContext.SetterChainSingletonObject)
));
}
DObject obj;
////// a property of a DObject:
if ((obj = target.Value as DObject) != null)
{
if (obj is ClrObject /*|| obj is IClrValue // IClrValue -> ClrValue<T> -> already in restriction */)
{
// ((DObject)target).RealType == <obj>.RealType
restrictions = restrictions.Merge(
BindingRestrictions.GetInstanceRestriction(
Expression.Property(Expression.Convert(target.Expression, Types.DObject[0]), Properties.DObject_RealType),
obj.RealType));
}
//// return GetObjectProperty(obj, name, caller, quiet);
DPropertyDesc property;
GetMemberResult result = obj.TypeDesc.GetInstanceProperty(new VariableName(fieldName), classContext, out property);
switch (result)
{
case GetMemberResult.OK:
////object value = property.Get(this);
////PhpReference reference = value as PhpReference;
if (property.Member is PhpField || property.Member is PhpVisibleProperty)
{
var realType = property.DeclaringType.RealType;
FieldInfo realField = (property.Member is PhpField) ? property.PhpField.RealField : null;
PropertyInfo realProperty = (property.Member is PhpVisibleProperty) ? ((PhpVisibleProperty)property.Member).RealProperty : null;
Debug.Assert(realField != null ^ realProperty != null);
MemberExpression getter = null;
if (realField != null)
{
getter = Expression.Field(Expression.Convert(target.Expression, realType), realField);
}
else if (realProperty != null)
{
getter = Expression.Property(Expression.Convert(target.Expression, realType), realProperty);
}
if (Types.PhpReference[0].IsAssignableFrom(getter.Type))
{
var reference = Expression.Variable(Types.PhpReference[0]);
var assignment = Expression.Assign(reference, getter);
if (WantReference)
{
////value = property.Get(this);
////reference = value as PhpReference;
var returnLabel = Expression.Label(this._returnType);
////if (reference != null && reference.IsSet)
////{
//// reference.IsAliased = true;
//// return reference;
////}
var isset = Expression.IfThen(
Expression.Property(assignment, Properties.PhpReference_IsSet),
Expression.Block(
Expression.Assign(Expression.Property(reference, Properties.PhpReference_IsAliased), Expression.Constant(true)),
Expression.Return(returnLabel, reference)));
////// the CT property has been unset -> try to invoke __get
////PhpReference get_ref = InvokeGetterRef(name, caller, out getter_exists);
////if (getter_exists) return (get_ref == null ? new PhpReference() : get_ref);
////if (reference == null)
////{
//// reference = new PhpReference(value);
//// property.Set(this, reference);
////}
////else
////{
//// reference.IsAliased = true;
//// reference.IsSet = true;
////}
Func <DObject, string, DTypeDesc, PhpReference, PhpReference> notsetOperation = (self, name, caller, refrnc) =>
{
bool getter_exists;
// the CT property has been unset -> try to invoke __get
PhpReference get_ref = self.InvokeGetterRef(name, caller, out getter_exists);
if (getter_exists)
{
return(get_ref ?? new PhpReference());
}
Debug.Assert(refrnc != null);
refrnc.IsAliased = true;
refrnc.IsSet = true;
return(refrnc);
};
////return reference;
return(new DynamicMetaObject(
Expression.Block(this._returnType,
new[] { reference },
new Expression[] {
isset,
Expression.Label(returnLabel,
Expression.Call(null, notsetOperation.Method, Expression.Convert(target.Expression, Types.DObject[0]), Expression.Constant(fieldName), Expression.Constant(classContext, Types.DTypeDesc[0]), reference))
}),
restrictions));
}
else
{
////if (reference != null && !reference.IsSet)
////{
//// // the property is CT but has been unset
//// if (issetSemantics)
//// {
//// bool handled;
//// return PropertyIssetHandler(name, caller, out handled);
//// }
//// else return GetRuntimeField(name, caller);
////}
////else return value;
Func <DObject, string, DTypeDesc, object> notsetOperation;
if (_issetSemantics)
{
notsetOperation = (self, name, caller) =>
{
return(PhpVariable.Dereference(self.GetRuntimeField(name, caller)));
}
}
;
else
{
notsetOperation = (self, name, caller) =>
{
bool handled;
return(PhpVariable.Dereference(self.PropertyIssetHandler(name, caller, out handled)));
}
};
var value =
Expression.Block(this._returnType,
new[] { reference },
Expression.Condition(
Expression.Property(assignment, Properties.PhpReference_IsSet),
Expression.Field(reference, Fields.PhpReference_Value),
Expression.Call(null, notsetOperation.Method, Expression.Convert(target.Expression, Types.DObject[0]), Expression.Constant(fieldName), Expression.Constant(classContext, Types.DTypeDesc[0]))
));
return(new DynamicMetaObject(value, restrictions));
}
}
else
{
if (WantReference)
{
return(new DynamicMetaObject(
Expression.New(Constructors.PhpReference_Object, Expression.Convert(getter, Types.Object[0])),
restrictions));
}
else
{
return(new DynamicMetaObject(
Expression.Call(Methods.PhpVariable.Dereference, Expression.Convert(getter, Types.Object[0])),
restrictions));
}
}
}
else if (property.Member is ClrProperty)
{
var realType = property.DeclaringType.RealType;
var realProperty = property.ClrProperty.RealProperty;
// (target.{RealObject|realValue}).<realProperty>
Expression value = Expression.Convert(
BinderHelper.ClrObjectWrapDynamic(
Expression.Property(
BinderHelper.ClrRealObject(target, realType),
realProperty)),
Types.Object[0]);
if (WantReference)
{
value = BinderHelper.MakePhpReference(value);
}
return(new DynamicMetaObject(value, restrictions));
}
else if (property.Member is ClrField)
{
var realType = property.DeclaringType.RealType;
var realField = property.ClrField.FieldInfo;
// (target.{RealObject|realValue}).<realField>
Expression value = Expression.Convert(
BinderHelper.ClrObjectWrapDynamic(
Expression.Field(
BinderHelper.ClrRealObject(target, realType),
realField)),
Types.Object[0]);
if (WantReference)
{
value = BinderHelper.MakePhpReference(value);
}
return(new DynamicMetaObject(value, restrictions));
}
else if (property.Member is ClrEvent)
{
var clrEvent = (ClrEvent)property.Member;
var realType = property.DeclaringType.RealType;
// emit stub that Wraps event as [ ClrEventObject<handlerType>.Wrap(<SC>, <event name>, <addMethod>, <removeMethod>) ]
var stub = new System.Reflection.Emit.DynamicMethod(
string.Format("event<{0}>", fieldName),
Types.DObject[0], new[] { realType }, realType);
var il = new ILEmitter(stub);
clrEvent.EmitGetEventObject(
il,
new Place(null, Properties.ScriptContext_CurrentContext),
new IndexedPlace(PlaceHolder.Argument, 0),
false);
il.Emit(System.Reflection.Emit.OpCodes.Ret);
Expression value = Expression.Call(stub, BinderHelper.ClrRealObject(target, realType));
if (WantReference)
{
value = BinderHelper.MakePhpReference(value);
}
return(new DynamicMetaObject(value, restrictions));
}
else
{
throw new NotImplementedException();
}
case GetMemberResult.NotFound:
if (WantReference)
{
Func <DObject, string, DTypeDesc, PhpReference> op = (self, name, caller) =>
{
PhpReference reference;
bool getter_exists;
// search in RT fields
if (self.RuntimeFields != null && self.RuntimeFields.ContainsKey(name))
{
var namekey = new IntStringKey(name);
return(self.RuntimeFields.table._ensure_item_ref(ref namekey, self.RuntimeFields));
}
// property is not present -> try to invoke __get
reference = self.InvokeGetterRef(name, caller, out getter_exists);
if (getter_exists)
{
return((reference == null) ? new PhpReference() : reference);
}
// (no notice/warning/error thrown by PHP)
// add the field
reference = new PhpReference();
if (self.RuntimeFields == null)
{
self.RuntimeFields = new PhpArray();
}
self.RuntimeFields[name] = reference;
return(reference);
};
return(new DynamicMetaObject(
Expression.Call(null, op.Method, Expression.Convert(target.Expression, Types.DObject[0]), Expression.Constant(fieldName), Expression.Constant(classContext, Types.DTypeDesc[0])),
restrictions));
}
else
{
////if (issetSemantics)
////{
//// OrderedHashtable<string>.Element element;
//// if (RuntimeFields != null && (element = RuntimeFields.GetElement(name)) != null)
//// {
//// return element.Value;
//// }
//// else
//// {
//// bool handled;
//// return PropertyIssetHandler(name, caller, out handled);
//// }
////}
////else return GetRuntimeField(name, caller);
if (_issetSemantics)
{
Func <DObject, string, DTypeDesc, object> notsetOperation = (self, name, caller) =>
{
if (self.RuntimeFields != null)
{
object value;
if (self.RuntimeFields.TryGetValue(name, out value))
{
return(value);
}
}
bool handled;
return(self.PropertyIssetHandler(name, caller, out handled));
};
return(new DynamicMetaObject(
Expression.Call(Methods.PhpVariable.Dereference,
Expression.Call(null, notsetOperation.Method, Expression.Convert(target.Expression, Types.DObject[0]), Expression.Constant(fieldName), Expression.Constant(classContext, Types.DTypeDesc[0]))),
restrictions));
}
else
{
return(new DynamicMetaObject(
Expression.Call(
Methods.PhpVariable.Dereference,
Expression.Call(
Expression.Convert(target.Expression, Types.DObject[0]),
Methods.DObject_GetRuntimeField, Expression.Constant(fieldName), Expression.Constant(classContext, Types.DTypeDesc[0]))),
restrictions));
};
}
case GetMemberResult.BadVisibility:
{
////PhpException.PropertyNotAccessible(
//// property.DeclaringType.MakeFullName(),
//// name.ToString(),
//// (caller == null ? String.Empty : caller.MakeFullName()),
//// property.IsProtected);
string stringResourceKey = property.IsProtected ? "protected_property_accessed" : "private_property_accessed";
return(new DynamicMetaObject(
Expression.Block(this._returnType,
Expression.Call(null, Methods.PhpException.Throw,
Expression.Constant(PhpError.Error, Types.PhpError_String[0]),
Expression.Constant(CoreResources.GetString(stringResourceKey, property.DeclaringType.MakeFullName(), fieldName, (classContext == null ? String.Empty : classContext.MakeFullName())))),
WantReference ? (Expression)Expression.New(Constructors.PhpReference_Void) : Expression.Constant(null)
),
restrictions));
}
}
}
////// warnings:
////if (!quiet) // not in isset() operator only
////{
if (!_issetSemantics)
{
//// if (PhpVariable.IsEmpty(var))
//// // empty:
//// PhpException.Throw(PhpError.Notice, CoreResources.GetString("empty_used_as_object"));
//// else
//// // PhpArray, string, scalar type:
//// PhpException.VariableMisusedAsObject(var, false);
Action <object> error = (var) =>
{
if (PhpVariable.IsEmpty(var))
{
// empty:
PhpException.Throw(PhpError.Notice, CoreResources.GetString("empty_used_as_object"));
}
else
{
// PhpArray, string, scalar type:
PhpException.VariableMisusedAsObject(var, false);
}
};
return(new DynamicMetaObject(
Expression.Block(this._returnType,
Expression.Call(error.Method, target.Expression),
WantReference ? (Expression)Expression.New(Constructors.PhpReference_Void) : Expression.Constant(null)),
(target.HasValue && target.Value == null) ?
BindingRestrictions.GetInstanceRestriction(target.Expression, null) :
BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType)));
}
////}
////// property does not exist
////return null;
return(new DynamicMetaObject(
Expression.Constant(null),
(target.HasValue && target.Value == null) ?
BindingRestrictions.GetInstanceRestriction(target.Expression, null) :
BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType)));
}
