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//
// IMLStream.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2016 jp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using System.IO;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
using System.Xml.Serialization;
using System.Xml;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
namespace Crow
{
public delegate bool BooleanTestOnInstance(object instance);
public class ItemTemplate : Instantiator {
public EventHandler Expand;
public BooleanTestOnInstance HasSubItems;
string strDataType;
string fetchMethodName;
#region CTOR
public ItemTemplate(string path, string _dataType = null, string _fetchDataMethod = null)
: base(path) {
strDataType = _dataType;
fetchMethodName = _fetchDataMethod;
}
public ItemTemplate (Stream ImlFragment, string _dataType, string _fetchDataMethod)
:base(ImlFragment)
{
strDataType = _dataType;
fetchMethodName = _fetchDataMethod;
}
#endregion
public void CreateExpandDelegate (TemplatedGroup host){
Type dataType = Type.GetType(strDataType);
Type tmpGrpType = typeof(TemplatedGroup);
Type evtType = typeof(EventHandler);
PropertyInfo piData = tmpGrpType.GetProperty ("Data");
MethodInfo evtInvoke = evtType.GetMethod ("Invoke");
ParameterInfo [] evtParams = evtInvoke.GetParameters ();
Type handlerArgsType = evtParams [1].ParameterType;
Type [] args = { CompilerServices.TObject, CompilerServices.TObject, handlerArgsType };
#region Expand dyn meth
//DM is bound to templatedGroup root (arg0)
//arg1 is the sender of the expand event
DynamicMethod dm = new DynamicMethod ("dyn_expand_" + fetchMethodName,
typeof (void), args, true);
System.Reflection.Emit.Label gotoEnd;
System.Reflection.Emit.Label ifDataIsNull;
ILGenerator il = dm.GetILGenerator (256);
il.DeclareLocal(typeof(GraphicObject));
gotoEnd = il.DefineLabel ();
ifDataIsNull = il.DefineLabel ();
il.Emit (OpCodes.Ldarg_1);//load sender of expand event
il.Emit(OpCodes.Ldstr, "List");
il.Emit (OpCodes.Callvirt, CompilerServices.miFindByName);
il.Emit (OpCodes.Stloc_0);
//check that 'Data' of list is not already set
il.Emit (OpCodes.Ldloc_0);
il.Emit (OpCodes.Callvirt, piData.GetGetMethod ());
il.Emit (OpCodes.Brfalse, ifDataIsNull);
il.Emit (OpCodes.Br, gotoEnd);
il.MarkLabel(ifDataIsNull);
//copy the ref of ItemTemplates list TODO: maybe find another way to share it among the nodes?
FieldInfo fiTemplates = tmpGrpType.GetField("ItemTemplates");
il.Emit (OpCodes.Ldloc_0);
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Ldfld, fiTemplates);
il.Emit (OpCodes.Stfld, fiTemplates);
//call 'fetchMethodName' from the dataSource to build the sub nodes list
il.Emit (OpCodes.Ldloc_0);//push 'List' (of sub nodes) into the stack
il.Emit (OpCodes.Ldarg_1);//get the dataSource of the sender
il.Emit (OpCodes.Callvirt, CompilerServices.miGetDataSource);
if (fetchMethodName != "self")//special keyword self allows the use of recurent list<<<
emitGetSubData(il, dataType);
//set 'return' from the fetch method as 'data' of the list
il.Emit (OpCodes.Callvirt, piData.GetSetMethod ());
il.MarkLabel(gotoEnd);
il.Emit (OpCodes.Ret);
Expand = (EventHandler)dm.CreateDelegate (evtType, host);
#endregion
#region Items counting dyn method
//dm is unbound, arg0 is instance of Item container to expand
dm = new DynamicMethod ("dyn_count_" + fetchMethodName,
typeof (bool), new Type[] {CompilerServices.TObject}, true);
il = dm.GetILGenerator (256);
//get the dataSource of the arg0
il.Emit (OpCodes.Ldarg_0);
il.Emit (OpCodes.Callvirt, CompilerServices.miGetDataSource);
if (fetchMethodName != "self")
emitGetSubData(il, dataType);
il.Emit (OpCodes.Callvirt, CompilerServices.miGetColCount);
il.Emit (OpCodes.Ldc_I4_0);
il.Emit (OpCodes.Cgt);
il.Emit (OpCodes.Ret);
HasSubItems = (BooleanTestOnInstance)dm.CreateDelegate (typeof(BooleanTestOnInstance));
#endregion
}
void emitGetSubData(ILGenerator il, Type dataType){
MethodInfo miGetDatas = dataType.GetMethod (fetchMethodName, new Type[] {});
if (miGetDatas == null)
miGetDatas = CompilerServices.SearchExtMethod (dataType, fetchMethodName);
if (miGetDatas == null) {//in last resort, search among properties
PropertyInfo piDatas = dataType.GetProperty (fetchMethodName);
if (piDatas == null) {
FieldInfo fiDatas = dataType.GetField (fetchMethodName);
if (fiDatas == null)//and among fields
throw new Exception ("Fetch data member not found in ItemTemplate: " + fetchMethodName);
il.Emit (OpCodes.Ldfld, fiDatas);
return;
}
miGetDatas = piDatas.GetGetMethod ();
if (miGetDatas == null)
throw new Exception ("Read only property for fetching data in ItemTemplate: " + fetchMethodName);
}
il.Emit (OpCodes.Callvirt, miGetDatas);
}
}
}
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