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Viewing changes to external/nrefactory/ICSharpCode.NRefactory.CSharp/Parser/SeekableStreamReader.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/Parser/SeekableStreamReader.cs
 
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//
 
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// SeekableStreamReader.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) 2012 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.IO;
 
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using System.Text;
 
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namespace Mono.CSharp
 
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{
 
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        public class SeekableStreamReader : IDisposable
 
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        {
 
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                public const int DefaultReadAheadSize = 2048;
 
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                readonly ITextSource textSource;
 
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                int pos;
 
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                static string GetAllText(Stream stream, Encoding encoding) {
 
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                        using (var rdr = new StreamReader(stream, encoding)) {
 
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                                return rdr.ReadToEnd();
 
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                        }
 
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                }
 
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                public SeekableStreamReader (Stream stream, Encoding encoding, char[] sharedBuffer = null) : this(new StringTextSource(GetAllText(stream, encoding)))
 
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                {
 
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                }
 
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                public SeekableStreamReader (ITextSource source)
 
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                {
 
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                        this.textSource = source;
 
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                }
 
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                public void Dispose ()
 
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                {
 
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                }
 
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                /// <remarks>
 
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                ///   This value corresponds to the current position in a stream of characters.
 
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                ///   The StreamReader hides its manipulation of the underlying byte stream and all
 
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                ///   character set/decoding issues.  Thus, we cannot use this position to guess at
 
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                ///   the corresponding position in the underlying byte stream even though there is
 
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                ///   a correlation between them.
 
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                /// </remarks>
 
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                public int Position {
 
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                        get {
 
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                                return pos;
 
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                        }
 
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                        set {
 
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                                pos = value;
 
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                        }
 
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                }
 
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                public char GetChar (int position)
 
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                {
 
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                        return textSource.GetCharAt (position);
 
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                }
 
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                public char[] ReadChars (int fromPosition, int toPosition)
 
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                {
 
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                        return textSource.GetText (fromPosition, toPosition - fromPosition).ToCharArray ();
 
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                }
 
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                public int Peek ()
 
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                {
 
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                        if (pos >= textSource.TextLength)
 
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                                return -1;
 
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                        return textSource.GetCharAt (pos);
 
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                }
 
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                public int Read ()
 
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                {
 
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                        if (pos >= textSource.TextLength)
 
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                                return -1;
 
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                        return textSource.GetCharAt (pos++);
 
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                }
 
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        }
 
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}
 
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