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//
// SeekableStreamReader.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using ICSharpCode.NRefactory.Editor;
using System.IO;
using System.Text;
namespace Mono.CSharp
{
public class SeekableStreamReader : IDisposable
{
public const int DefaultReadAheadSize = 2048;
readonly ITextSource textSource;
int pos;
static string GetAllText(Stream stream, Encoding encoding) {
using (var rdr = new StreamReader(stream, encoding)) {
return rdr.ReadToEnd();
}
}
public SeekableStreamReader (Stream stream, Encoding encoding, char[] sharedBuffer = null) : this(new StringTextSource(GetAllText(stream, encoding)))
{
}
public SeekableStreamReader (ITextSource source)
{
this.textSource = source;
}
public void Dispose ()
{
}
/// <remarks>
/// This value corresponds to the current position in a stream of characters.
/// The StreamReader hides its manipulation of the underlying byte stream and all
/// character set/decoding issues. Thus, we cannot use this position to guess at
/// the corresponding position in the underlying byte stream even though there is
/// a correlation between them.
/// </remarks>
public int Position {
get {
return pos;
}
set {
pos = value;
}
}
public char GetChar (int position)
{
return textSource.GetCharAt (position);
}
public char[] ReadChars (int fromPosition, int toPosition)
{
return textSource.GetText (fromPosition, toPosition - fromPosition).ToCharArray ();
}
public int Peek ()
{
if (pos >= textSource.TextLength)
return -1;
return textSource.GetCharAt (pos);
}
public int Read ()
{
if (pos >= textSource.TextLength)
return -1;
return textSource.GetCharAt (pos++);
}
}
}
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