119 lines
2.7 KiB
C#
119 lines
2.7 KiB
C#
//
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// System.CharEnumerator.cs
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//
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// Author:
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// Duncan Mak (duncan@ximian.com)
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//
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// (C) Ximian, Inc.
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in 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,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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namespace System
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{
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[Serializable]
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[ComVisible (true)]
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public sealed class CharEnumerator : IEnumerator, ICloneable, IEnumerator<char>
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{
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private string str;
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private int index;
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private int length;
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// Representation invariant:
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// length == str.Length
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// -1 <= index <= length
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// Constructor
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internal CharEnumerator (string s)
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{
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str = s;
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index = -1;
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length = s.Length;
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}
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// Properties
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public char Current {
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get {
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if (index == -1 || index >= length)
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throw new InvalidOperationException (Locale.GetText ("The position is not valid."));
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return str [index];
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}
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}
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object IEnumerator.Current {
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get {
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return Current;
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}
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}
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#if NET_4_0
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public void Dispose ()
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#else
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void IDisposable.Dispose ()
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#endif
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{
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// nop
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}
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// Methods
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public object Clone ()
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{
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CharEnumerator x = new CharEnumerator (str);
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x.index = index;
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return x;
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}
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public bool MoveNext ()
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{
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// Representation invariant holds: -1 <= index <= length
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index ++;
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// Now: 0 <= index <= length+1;
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// <=>
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// 0 <= index < length (OK) ||
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// length <= index <= length+1 (Out of bounds)
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if (index >= length) {
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index = length;
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// Invariant restored:
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// length == index
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// =>
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// -1 <= index <= length
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return false;
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}
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else
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return true;
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}
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public void Reset ()
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{
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index = -1;
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}
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}
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}
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