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//
// Authors
// Sebastien Pouliot <sebastien@xamarin.com>
//
// Copyright 2013 Xamarin Inc. http://www.xamarin.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml.Linq;
namespace Xamarin.ApiDiff {
public abstract class Comparer {
protected List<XElement> removed = new List<XElement> ();
protected ApiChanges modified = new ApiChanges ();
public TextWriter Output {
get { return State.Output; }
}
protected TextWriter Indent ()
{
for (int i = 0; i < State.Indent; i++)
State.Output.Write ("\t");
return State.Output;
}
public abstract void Added (XElement target, bool wasParentAdded);
public abstract void Modified (XElement source, XElement target, ApiChanges changes);
public abstract void Removed (XElement source);
public virtual bool Equals (XElement source, XElement target, ApiChanges changes)
{
return XNode.DeepEquals (source, target);
}
public abstract void SetContext (XElement current);
public virtual void Compare (IEnumerable<XElement> source, IEnumerable<XElement> target)
{
removed.Clear ();
modified.Clear ();
foreach (var s in source) {
SetContext (s);
string sn = s.GetAttribute ("name");
var t = target == null ? null : target.SingleOrDefault (x => x.GetAttribute ("name") == sn);
if (t == null) {
// not in target, it was removed
removed.Add (s);
} else {
t.Remove ();
// possibly modified
if (Equals (s, t, modified))
continue;
// still in target so will be part of Added
Modified (s, t, modified);
}
}
// delayed, that way we show "Modified", "Added" and then "Removed"
foreach (var item in removed) {
SetContext (item);
Removed (item);
}
// remaining == newly added in target
if (target != null) {
foreach (var item in target) {
SetContext (item);
Added (item, false);
}
}
}
}
}
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