void Walk(RuntimeAttribute a, RuntimeAttribute b)
{
if (a == b)
{
return;
}
var group = new PatchGroup();
if (a != null && a.IsThunk && b != null && b.IsThunk) // diff thunk
{
// TODO: ....
//var patchDiff = Diff(a, b);
//if (patchDiff.HasPatch)
//{
// group.Append(new PatchOperateThunk(patchDiff));
//}
}
else if (b == null)
{
group.Append(new PatchOperateRemove(a));
}
else if (a.template.TagName == b.template.TagName && a.template.Key == b.template.Key)
{
//// diff once function
//var needToExecute = DiffOnceExpresstion(a.onceExecuteFunc, b.onceExecuteFunc);
//if (needToExecute != null)
//{
// group.Append(new PatchOperateOnceFunc(a, needToExecute, b.onceExecuteFunc));
//}
// diff properties
var propsPatch = DiffProperties(a.attributes, b.attributes);
if (propsPatch != null && propsPatch.Count > 0)
{
group.Append(new PatchOperateProperties(a, propsPatch));
}
if (a.textDataBindExpressCurrentValue != b.textDataBindExpressCurrentValue)
{
group.Append(new PatchOperateText(a, b.textDataBindExpressCurrentValue));
}
DiffChildren(a, b, group);
}
else
{
group.Append(new PatchOperateChange(a, b));
//// change the a & b
//// execute once function
//group.Append(new PatchOperateOnceFunc(b, b.template.onceExpressList, b.onceExecuteFunc));
}
if (group.HasChange)
{
groupList.AddLast(group);
}
}
void DiffChildren(RuntimeAttribute a, RuntimeAttribute b, PatchGroup group)
{
var aChildren = a.Children;
var bChildren = b.Children;
var aLen = aChildren.Count;
var bLen = bChildren.Count;
var len = aLen > bLen ? aLen : bLen;
var leftIter = aChildren.GetEnumerator();
var rightIter = bChildren.GetEnumerator();
for (int i = 0; i < len; i++)
{
var leftNode = leftIter.MoveNext() ? leftIter.Current : null;
var rightNode = rightIter.MoveNext() ? rightIter.Current : null;
if (leftNode == null)
{
if (rightNode != null)
{
// Excess nodes in b need to be added
group.Append(new PatchOperateInsert(a, rightNode));
//// execute once function
//group.Append(new PatchOperateOnceFunc(rightNode, rightNode.template.onceExpressList, rightNode.onceExecuteFunc));
}
}
else
{
Walk(leftNode, rightNode); // change it or remove it.
}
}
}