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//
// CSharpFormatter.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2013 Xamarin Inc. (http://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 ICSharpCode.NRefactory.Editor;
using System.Threading;
using System.Linq;
using ICSharpCode.NRefactory.CSharp.Refactoring;
using ICSharpCode.NRefactory.TypeSystem;
using System.Collections.Generic;
namespace ICSharpCode.NRefactory.CSharp
{
/// <summary>
/// The formatting changes are used to format a specific region inside a document and apply a minimal formatting
/// changeset to a given document. This is useful for a text editor environment.
/// </summary>
public class FormattingChanges
{
readonly IDocument document;
readonly internal List<TextReplaceAction> changes = new List<TextReplaceAction> ();
internal FormattingChanges (IDocument document)
{
if (document == null)
throw new ArgumentNullException("document");
this.document = document;
}
/// <summary>
/// Applies the changes to the input document.
/// </summary>
public void ApplyChanges()
{
ApplyChanges(0, document.TextLength, document.Replace, (o, l, v) => document.GetText(o, l) == v);
}
public void ApplyChanges(int startOffset, int length)
{
ApplyChanges(startOffset, length, document.Replace, (o, l, v) => document.GetText(o, l) == v);
}
/// <summary>
/// Applies the changes to the given Script instance.
/// </summary>
public void ApplyChanges(Script script)
{
ApplyChanges(0, document.TextLength, script.Replace);
}
public void ApplyChanges(int startOffset, int length, Script script)
{
ApplyChanges(startOffset, length, script.Replace);
}
public void ApplyChanges(int startOffset, int length, Action<int, int, string> documentReplace, Func<int, int, string, bool> filter = null)
{
int endOffset = startOffset + length;
// Console.WriteLine ("apply:"+ startOffset + "->" + endOffset);
// Console.WriteLine (document.Text.Substring (0, startOffset) + new string ('x',length) + document.Text.Substring (startOffset+ length));
TextReplaceAction previousChange = null;
int delta = 0;
var depChanges = new List<TextReplaceAction> ();
foreach (var change in changes.OrderBy(c => c.Offset)) {
if (previousChange != null) {
if (change.Equals(previousChange)) {
// ignore duplicate changes
continue;
}
if (change.Offset < previousChange.Offset + previousChange.RemovalLength) {
throw new InvalidOperationException ("Detected overlapping changes " + change + "/" + previousChange);
}
}
previousChange = change;
bool skipChange = change.Offset + change.RemovalLength < startOffset || change.Offset > endOffset;
skipChange |= filter != null && filter(change.Offset + delta, change.RemovalLength, change.NewText);
skipChange &= !depChanges.Contains(change);
if (!skipChange) {
documentReplace(change.Offset + delta, change.RemovalLength, change.NewText);
delta += change.NewText.Length - change.RemovalLength;
if (change.DependsOn != null) {
depChanges.Add(change.DependsOn);
}
}
}
changes.Clear();
}
internal TextReplaceAction AddChange(int offset, int removedChars, string insertedText)
{
if (removedChars == 0 && string.IsNullOrEmpty (insertedText))
return null;
var action = new TextReplaceAction (offset, removedChars, insertedText);
changes.Add(action);
return action;
}
internal sealed class TextReplaceAction
{
internal readonly int Offset;
internal readonly int RemovalLength;
internal readonly string NewText;
internal TextReplaceAction DependsOn;
public TextReplaceAction (int offset, int removalLength, string newText)
{
this.Offset = offset;
this.RemovalLength = removalLength;
this.NewText = newText ?? string.Empty;
}
public override bool Equals(object obj)
{
TextReplaceAction other = obj as TextReplaceAction;
if (other == null) {
return false;
}
return this.Offset == other.Offset && this.RemovalLength == other.RemovalLength && this.NewText == other.NewText;
}
public override int GetHashCode()
{
return 0;
}
public override string ToString()
{
return string.Format("[TextReplaceAction: Offset={0}, RemovalLength={1}, NewText={2}]", Offset, RemovalLength, NewText);
}
}
}
}
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