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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace clojure.lang
{
public class PushbackTextReader : TextReader, IDisposable
{
#region Data
protected TextReader _baseReader;
protected TextReader BaseReader
{
get { return _baseReader; }
}
protected int _unreadChar;
protected bool _hasUnread = false;
#endregion
#region C-tors
public PushbackTextReader(TextReader reader)
{
_baseReader = reader;
}
#endregion
#region Lookahead
public override int Peek()
{
return _baseReader.Peek();
}
#endregion
#region Unreading
public virtual void Unread(int ch)
{
if (_hasUnread)
throw new IOException("Can't unread a second character.");
_unreadChar = ch;
_hasUnread = true;
}
#endregion
#region Basic reading
public override int Read()
{
int ret;
if (_hasUnread)
{
ret = _unreadChar;
_hasUnread = false;
}
else
ret = _baseReader.Read();
return ret;
}
#endregion
#region Lifetime methods
public override void Close()
{
_baseReader.Close();
base.Close();
}
void IDisposable.Dispose()
{
_baseReader.Dispose();
base.Dispose();
}
#endregion
}
}
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