Browse Source
Usage: TextAnchor anchor = document.GetLineSegment(lineNumber).CreateAnchor(columnNumber); anchor.LineNumber and anchor.ColumnNumber are updated when text is inserted/removed in the document. anchor.IsDeleted will be true when the text location containing the anchor was removed. LineSegment gets an IsDeleted property, so a LineSegment reference can be used as anchor for a line. git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2683 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61shortcuts
Daniel Grunwald
19 years ago
12 changed files with 541 additions and 159 deletions
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// <file>
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// <copyright see="prj:///doc/copyright.txt"/>
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// <license see="prj:///doc/license.txt"/>
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// <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
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// <version>$Revision$</version>
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// </file>
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using System; |
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namespace ICSharpCode.TextEditor.Document |
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{ |
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/// <summary>
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/// Description of TextAnchor.
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/// </summary>
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public sealed class TextAnchor |
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{ |
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static Exception AnchorDeletedError() |
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{ |
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return new InvalidOperationException("The text containing the anchor was deleted"); |
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} |
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LineSegment lineSegment; |
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int columnNumber; |
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public LineSegment Line { |
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get { |
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if (lineSegment == null) throw AnchorDeletedError(); |
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return lineSegment; |
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} |
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internal set { |
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lineSegment = value; |
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} |
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} |
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public bool IsDeleted { |
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get { |
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return lineSegment == null; |
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} |
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} |
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public int LineNumber { |
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get { |
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return this.Line.LineNumber; |
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} |
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} |
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public int ColumnNumber { |
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get { |
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if (lineSegment == null) throw AnchorDeletedError(); |
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return columnNumber; |
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} |
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internal set { |
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columnNumber = value; |
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} |
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} |
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public TextLocation Location { |
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get { |
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return new TextLocation(this.ColumnNumber, this.LineNumber); |
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} |
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} |
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public int Offset { |
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get { |
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return this.Line.Offset + columnNumber; |
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} |
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} |
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internal void Deleted() |
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{ |
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lineSegment = null; |
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} |
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internal TextAnchor(LineSegment lineSegment, int columnNumber) |
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{ |
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this.lineSegment = lineSegment; |
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this.columnNumber = columnNumber; |
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} |
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public override string ToString() |
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{ |
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if (this.IsDeleted) |
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return "[TextAnchor (deleted)]"; |
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else |
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return "[TextAnchor " + this.Location.ToString() + "]"; |
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} |
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} |
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} |
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@ -0,0 +1,136 @@ |
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// <file>
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// <copyright see="prj:///doc/copyright.txt"/>
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// <license see="prj:///doc/license.txt"/>
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// <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
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// <version>$Revision$</version>
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// </file>
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using System; |
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using System.Collections.Generic; |
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namespace ICSharpCode.TextEditor.Util |
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{ |
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/// <summary>
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/// A collection that does not allows its elements to be garbage-collected (unless there are other
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/// references to the elements). Elements will disappear from the collection when they are
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/// garbage-collected.
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///
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/// The WeakCollection is not thread-safe, not even for read-only access!
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/// No methods may be called on the WeakCollection while it is enumerated, not even a Contains or
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/// creating a second enumerator.
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/// The WeakCollection does not preserve any order among its contents; the ordering may be different each
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/// time the collection is enumerated.
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///
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/// Since items may disappear at any time when they are garbage collected, this class
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/// cannot provide a useful implementation for Count and thus cannot implement the ICollection interface.
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/// </summary>
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public class WeakCollection<T> : IEnumerable<T> where T : class |
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{ |
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readonly List<WeakReference> innerList = new List<WeakReference>(); |
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/// <summary>
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/// Adds an element to the collection. Runtime: O(n).
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/// </summary>
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public void Add(T item) |
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{ |
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if (item == null) |
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throw new ArgumentNullException("item"); |
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CheckNoEnumerator(); |
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if (innerList.Count == innerList.Capacity || (innerList.Count % 32) == 31) |
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innerList.RemoveAll(delegate(WeakReference r) { return !r.IsAlive; }); |
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innerList.Add(new WeakReference(item)); |
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} |
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/// <summary>
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/// Removes all elements from the collection. Runtime: O(n).
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/// </summary>
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public void Clear() |
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{ |
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innerList.Clear(); |
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CheckNoEnumerator(); |
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} |
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/// <summary>
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/// Checks if the collection contains an item. Runtime: O(n).
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/// </summary>
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public bool Contains(T item) |
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{ |
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if (item == null) |
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throw new ArgumentNullException("item"); |
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CheckNoEnumerator(); |
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foreach (T element in this) { |
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if (item.Equals(element)) |
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return true; |
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} |
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return false; |
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} |
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/// <summary>
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/// Removes an element from the collection. Returns true if the item is found and removed,
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/// false when the item is not found.
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/// Runtime: O(n).
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/// </summary>
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public bool Remove(T item) |
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{ |
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if (item == null) |
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throw new ArgumentNullException("item"); |
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CheckNoEnumerator(); |
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for (int i = 0; i < innerList.Count;) { |
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T element = (T)innerList[i].Target; |
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if (element == null) { |
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RemoveAt(i); |
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} else if (element == item) { |
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RemoveAt(i); |
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return true; |
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} else { |
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i++; |
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} |
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} |
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return false; |
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} |
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void RemoveAt(int i) |
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{ |
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int lastIndex = innerList.Count - 1; |
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innerList[i] = innerList[lastIndex]; |
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innerList.RemoveAt(lastIndex); |
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} |
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bool hasEnumerator; |
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void CheckNoEnumerator() |
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{ |
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if (hasEnumerator) |
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throw new InvalidOperationException("The WeakCollection is already being enumerated, it cannot be modified at the same time. Ensure you dispose the first enumerator before modifying the WeakCollection."); |
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} |
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/// <summary>
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/// Enumerates the collection.
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/// Each MoveNext() call on the enumerator is O(1), thus the enumeration is O(n).
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/// </summary>
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public IEnumerator<T> GetEnumerator() |
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{ |
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if (hasEnumerator) |
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throw new InvalidOperationException("The WeakCollection is already being enumerated, it cannot be enumerated twice at the same time. Ensure you dispose the first enumerator before using another enumerator."); |
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try { |
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hasEnumerator = true; |
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for (int i = 0; i < innerList.Count;) { |
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T element = (T)innerList[i].Target; |
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if (element == null) { |
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RemoveAt(i); |
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} else { |
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yield return element; |
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i++; |
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} |
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} |
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} finally { |
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hasEnumerator = false; |
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} |
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} |
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() |
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{ |
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return GetEnumerator(); |
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} |
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} |
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} |
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