public override PhpTypeCode Emit(LinqBuilder codeGenerator)
{
ILEmitter il = codeGenerator.IL;
// NEW Func[object,object](<linq context>, <&lambda>);
codeGenerator.EmitLoadLinqContext();
il.Emit(OpCodes.Ldftn, codeGenerator.EmitLambda(string.Format("<Selector_{0}>",
codeGenerator.GetNextSelectorNum()), valueVar, byExpr, PhpTypeCode.Object));
il.Emit(OpCodes.Newobj, LinqExterns.Func2_object_object_ctor);
DirectVarUse groupByVar = groupExpr as DirectVarUse;
if ((groupByVar != null) && (groupByVar.VarName == valueVar.VarName))
{
// LOAD Select[object,object](<source>, <delegate>);
// Simplified version - no element selector
il.Emit(OpCodes.Call, LinqExterns.GroupBy);
}
else
{
// with element selector
codeGenerator.EmitLoadLinqContext();
il.Emit(OpCodes.Ldftn, codeGenerator.EmitLambda(string.Format("<Selector_{0}>",
codeGenerator.GetNextSelectorNum()), valueVar, groupExpr, PhpTypeCode.Object));
il.Emit(OpCodes.Newobj, LinqExterns.Func2_object_object_ctor);
il.Emit(OpCodes.Call, LinqExterns.GroupByElementSel);
}
// Conversion from IEnumerable<IGrouping<..>> to IEnumerable<object>
il.Emit(OpCodes.Call, Methods.ClrObject_WrapRealObject);
codeGenerator.CodeGenerator.EmitLoadClassContext();
il.Emit(OpCodes.Call, Methods.Convert.ObjectToLinqSource);
return base.Emit(codeGenerator);
}
/// <summary>
/// Emit lambda function that implements projection and call to
/// IEnumerable.Select function (with current LINQ context as
/// first and generated lambda as a second parameter)
/// </summary>
public override PhpTypeCode Emit(LinqBuilder/*!*/ builder)
{
ILEmitter il = builder.IL;
// source expected on stack
// NEW Func[object,object](<linq context>, <&lambda>);
builder.EmitLoadLinqContext();
il.Emit(OpCodes.Ldftn, builder.EmitLambda(string.Format("<Selector_{0}>",
builder.GetNextSelectorNum()), valueVar, selector, PhpTypeCode.Object));
il.Emit(OpCodes.Newobj, LinqExterns.Func2_object_object_ctor);
// LOAD Select[object,object](<source>, <delegate>);
il.Emit(OpCodes.Call, LinqExterns.Select);
//il.Emit(OpCodes.Call, Methods.Operators.Select);
return base.Emit(builder);
}