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Viewing changes to external/nrefactory/ICSharpCode.NRefactory.CSharp/Formatter/FormattingChanges.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/nrefactory/ICSharpCode.NRefactory.CSharp/Formatter/FormattingChanges.cs
 
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//
 
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// CSharpFormatter.cs
 
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//
 
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// Author:
 
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//       Mike Krüger <mkrueger@xamarin.com>
 
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//
 
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// Copyright (c) 2013 Xamarin Inc. (http://xamarin.com)
 
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//
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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//
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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//
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using ICSharpCode.NRefactory.Editor;
 
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using System.Threading;
 
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using System.Linq;
 
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using ICSharpCode.NRefactory.CSharp.Refactoring;
 
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using ICSharpCode.NRefactory.TypeSystem;
 
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using System.Collections.Generic;
 
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namespace ICSharpCode.NRefactory.CSharp
 
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{
 
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        /// <summary>
 
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        /// The formatting changes are used to format a specific region inside a document and apply a minimal formatting
 
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        /// changeset to a given document. This is useful for a text editor environment.
 
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        /// </summary>
 
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        public class FormattingChanges
 
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        {
 
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                readonly IDocument document;
 
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                readonly internal List<TextReplaceAction> changes = new List<TextReplaceAction> ();
 
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                internal FormattingChanges (IDocument document)
 
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                {
 
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                        if (document == null)
 
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                                throw new ArgumentNullException("document");
 
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                        this.document = document;
 
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                }
 
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                /// <summary>
 
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                /// Applies the changes to the input document.
 
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                /// </summary>
 
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                public void ApplyChanges()
 
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                {
 
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                        ApplyChanges(0, document.TextLength, document.Replace, (o, l, v) => document.GetText(o, l) == v);
 
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                }
 
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                public void ApplyChanges(int startOffset, int length)
 
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                {
 
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                        ApplyChanges(startOffset, length, document.Replace, (o, l, v) => document.GetText(o, l) == v);
 
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                }
 
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                /// <summary>
 
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                /// Applies the changes to the given Script instance.
 
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                /// </summary>
 
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                public void ApplyChanges(Script script)
 
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                {
 
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                        ApplyChanges(0, document.TextLength, script.Replace);
 
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                }
 
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                public void ApplyChanges(int startOffset, int length, Script script)
 
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                {
 
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                        ApplyChanges(startOffset, length, script.Replace);
 
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                }
 
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                public void ApplyChanges(int startOffset, int length, Action<int, int, string> documentReplace, Func<int, int, string, bool> filter = null)
 
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                {
 
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                        int endOffset = startOffset + length;
 
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                        //                      Console.WriteLine ("apply:"+ startOffset + "->" + endOffset);
 
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                        //                      Console.WriteLine (document.Text.Substring (0, startOffset) + new string ('x',length) + document.Text.Substring (startOffset+ length));
 
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                        TextReplaceAction previousChange = null;
 
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                        int delta = 0;
 
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                        var depChanges = new List<TextReplaceAction> ();
 
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                        foreach (var change in changes.OrderBy(c => c.Offset)) {
 
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                                if (previousChange != null) {
 
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                                        if (change.Equals(previousChange)) {
 
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                                                // ignore duplicate changes
 
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                                                continue;
 
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                                        }
 
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                                        if (change.Offset < previousChange.Offset + previousChange.RemovalLength) {
 
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                                                throw new InvalidOperationException ("Detected overlapping changes " + change + "/" + previousChange);
 
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                                        }
 
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                                }
 
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                                previousChange = change;
 
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                                bool skipChange = change.Offset + change.RemovalLength < startOffset || change.Offset > endOffset;
 
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                                skipChange |= filter != null && filter(change.Offset + delta, change.RemovalLength, change.NewText);
 
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                                skipChange &= !depChanges.Contains(change);
 
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                                if (!skipChange) {
 
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                                        documentReplace(change.Offset + delta, change.RemovalLength, change.NewText);
 
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                                        delta += change.NewText.Length - change.RemovalLength;
 
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                                        if (change.DependsOn != null) {
 
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                                                depChanges.Add(change.DependsOn);
 
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                                        }
 
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                                }
 
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                        }
 
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                        changes.Clear();
 
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                }
 
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                internal TextReplaceAction AddChange(int offset, int removedChars, string insertedText)
 
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                {
 
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                        if (removedChars == 0 && string.IsNullOrEmpty (insertedText))
 
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                                return null;
 
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                        var action = new TextReplaceAction (offset, removedChars, insertedText);
 
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                        changes.Add(action);
 
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                        return action;
 
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                }
 
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                internal sealed class TextReplaceAction
 
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                {
 
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                        internal readonly int Offset;
 
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                        internal readonly int RemovalLength;
 
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                        internal readonly string NewText;
 
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                        internal TextReplaceAction DependsOn;
 
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                        public TextReplaceAction (int offset, int removalLength, string newText)
 
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                        {
 
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                                this.Offset = offset;
 
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                                this.RemovalLength = removalLength;
 
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                                this.NewText = newText ?? string.Empty;
 
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                        }
 
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                        public override bool Equals(object obj)
 
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                        {
 
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                                TextReplaceAction other = obj as TextReplaceAction;
 
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                                if (other == null) {
 
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                                        return false;
 
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                                }
 
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                                return this.Offset == other.Offset && this.RemovalLength == other.RemovalLength && this.NewText == other.NewText;
 
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                        }
 
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                        public override int GetHashCode()
 
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                        {
 
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                                return 0;
 
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                        }
 
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                        public override string ToString()
 
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                        {
 
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                                return string.Format("[TextReplaceAction: Offset={0}, RemovalLength={1}, NewText={2}]", Offset, RemovalLength, NewText);
 
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                        }
 
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                }
 
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        }
 
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}