//Similar to ArrayAccess.GetUserArrayItem, but getting access to a C# IDictionary
internal static object GetListItem(IList arrayAccess, object key, Operators.GetItemKinds kind)
{
int index = Convert.ObjectToInteger(key); // index used as key in IList
switch (kind)
{
case Operators.GetItemKinds.Isset:
// pass isset() ""/null to say true/false depending on the value returned from "offsetExists":
return (index >= 0 && index < arrayAccess.Count) ? "" : 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():
if (index < 0 || index >= arrayAccess.Count)
return null;
else
goto default;
default:
// regular getter:
return ClrObject.WrapDynamic(PhpVariable.Dereference(arrayAccess[index]));
}
}
/// <summary>
/// Emits IL instructions that load the value of an item of given array.
/// </summary>
/// <param name="array"><see cref="Expression"/> determining the array.</param>
/// <param name="index"><see cref="Expression"/> determining the index whose value
/// should be obtained from the array.</param>
/// <param name="kind">A kind of getter.</param>
/// <remarks>Nothing is supposed on the evaluation stack. The value of the item is left
/// on the evaluation stack.</remarks>
public PhpTypeCode EmitGetItem(Expression/*!*/ array, Expression/*!*/ index, Operators.GetItemKinds kind)
{
ILEmitter il = codeGenerator.IL;
// array:
var arrayTypeCode = array.Emit(codeGenerator);
// ensure the array is writeable is required
if (EnsureWritable)
codeGenerator.EmitEnsureWritable(arrayTypeCode);
// index:
PhpTypeCode index_type_code = codeGenerator.EmitArrayKey(this, index);
// kind:
if (kind == Operators.GetItemKinds.Get && QuietRead)
kind = Operators.GetItemKinds.QuietGet;
il.LdcI4((int)kind);
// CALL Operators.GetItem(<array>, <index>, <kind>)
codeGenerator.EmitGetItem(index_type_code, index, false);
return PhpTypeCode.Object;
}
//Similar to ArrayAccess.GetUserArrayItem, but getting access to a C# IDictionary
internal static object GetDictionaryItem(IDictionary arrayAccess, object key, Operators.GetItemKinds kind)
{
switch (kind)
{
case Operators.GetItemKinds.Isset:
// pass isset() ""/null to say true/false depending on the value returned from "offsetExists":
return arrayAccess.Contains(key) ? "" : 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():
if (!arrayAccess.Contains(key))
return null;
else
goto default;
default:
// regular getter:
return ClrObject.WrapDynamic(PhpVariable.Dereference(arrayAccess[key]));
}
}
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));
}
}
