// <file> // <copyright see="prj:///doc/copyright.txt"/> // <license see="prj:///doc/license.txt"/> // <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/> // <version>$Revision: 1471 $</version> // </file> using System; using System.Collections.Generic; namespace ICSharpCode.TextEditor.Document { /// <summary> /// A stack of Span instances. Works like Stack<Span>, but can be cloned quickly /// because it is implemented as linked list. /// </summary> public sealed class SpanStack : ICloneable, IEnumerable<Span> { internal sealed class StackNode { public readonly StackNode Previous; public readonly Span Data; public StackNode(StackNode previous, Span data) { this.Previous = previous; this.Data = data; } } StackNode top = null; public Span Pop() { Span s = top.Data; top = top.Previous; return s; } public Span Peek() { return top.Data; } public void Push(Span s) { top = new StackNode(top, s); } public bool IsEmpty { get { return top == null; } } public SpanStack Clone() { SpanStack n = new SpanStack(); n.top = this.top; return n; } object ICloneable.Clone() { return this.Clone(); } public Enumerator GetEnumerator() { return new Enumerator(new StackNode(top, null)); } IEnumerator<Span> IEnumerable<Span>.GetEnumerator() { return this.GetEnumerator(); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return this.GetEnumerator(); } public struct Enumerator : IEnumerator<Span> { StackNode c; internal Enumerator(StackNode node) { c = node; } public Span Current { get { return c.Data; } } object System.Collections.IEnumerator.Current { get { return c.Data; } } public void Dispose() { c = null; } public bool MoveNext() { c = c.Previous; return c != null; } public void Reset() { throw new NotSupportedException(); } } } }
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