internal static object GetUserArrayItem(DObject /*!*/ arrayAccess, object index, Operators.GetItemKinds kind)
{
PhpStack stack = ScriptContext.CurrentContext.Stack;
switch (kind)
{
case Operators.GetItemKinds.Isset:
// pass isset() ""/null to say true/false depending on the value returned from "offsetExists":
stack.AddFrame(index);
return(Core.Convert.ObjectToBoolean(arrayAccess.InvokeMethod(offsetExists, null, stack.Context)) ? "" : null);
case Operators.GetItemKinds.Empty:
// if "offsetExists" returns false, the empty()/isset() returns false (pass null to say true/false):
// otherwise, "offsetGet" is called to retrieve the value, which is passed to isset():
stack.AddFrame(index);
if (!Core.Convert.ObjectToBoolean(arrayAccess.InvokeMethod(offsetExists, null, stack.Context)))
{
return(null);
}
else
{
goto default;
}
default:
// regular getter:
stack.AddFrame(index);
return(PhpVariable.Dereference(arrayAccess.InvokeMethod(offsetGet, null, stack.Context)));
}
}
/// <summary>
/// Emits code to load variable onto the evaluation stack. Supports operators chaining.
/// </summary>
/// <param name="codeGenerator">A geenrator.</param>
/// <param name="itemGetterKind">Whether to load for "get", "isset", or "empty".</param>
private PhpTypeCode EmitNodeRead(CodeGenerator /*!*/ codeGenerator, Operators.GetItemKinds itemGetterKind)
{
ChainBuilder chain = codeGenerator.ChainBuilder;
PhpTypeCode result;
if (chain.IsArrayItem)
{
// we are in the array subchain //
// 3: a_[x]_[x]
chain.Lengthen(); // for []
result = chain.EmitGetItem(array, index, itemGetterKind);
return(result);
}
// 1,2,4,5,6,7
if (chain.IsMember)
{
// we are in the field chain //
// 4, 5
if (this.isMemberOf != null)
{
// we are in the middle of the field chain //
// 5: ...->a[]->...
// Lengthen chain for isMemberOf
chain.Lengthen(); // for hop over ->
isMemberOf.Emit(codeGenerator);
// Lengthen chain for own []
chain.Lengthen();
chain.IsArrayItem = true;
chain.IsLastMember = false;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
return(result);
}
else
{
// we are at the beginning of the field chain //
// 4: a[x]->...
// Lengthen chain for itself
chain.Lengthen(); // for own []
chain.IsArrayItem = true;
chain.IsLastMember = true;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
return(result);
}
}
// 1, 2, 6, 7
if (this.isMemberOf != null)
{
// last node of the field chain //
// 6 , 7: ...->a[]_[]_ , ...->a_[]_
bool quiet_read = chain.QuietRead;
chain.Create();
chain.Begin();
chain.QuietRead = quiet_read;
chain.Lengthen(); // for hop over ->
isMemberOf.Emit(codeGenerator);
// let's emit the array subchain followed by the GetItem:
chain.IsArrayItem = true;
chain.IsLastMember = false;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
chain.End();
return(result);
}
// 1, 2
if (array is ItemUse || array is DirectStFldUse || array is IndirectStFldUse)
{
// we are at the beginning of the field chain //
// 2: a[]_[]_
bool quiet_read = chain.QuietRead;
chain.Create();
chain.Begin();
chain.QuietRead = quiet_read;
chain.IsArrayItem = true;
chain.IsLastMember = true;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
chain.End();
return(result);
}
// no chains //
// 1: a_[x]_
chain.IsArrayItem = true;
chain.IsLastMember = true;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
return(result);
}