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/**
* Copyright (c) Rich Hickey. All rights reserved.
* The use and distribution terms for this software are covered by the
* Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
* which can be found in the file CPL.TXT at the root of this distribution.
* By using this software in any fashion, you are agreeing to be bound by
* the terms of this license.
* You must not remove this notice, or any other, from this software.
**/
using System;
using System.IO;
namespace clojure.lang
{
public class LineNumberingTextReader : TextReader, IDisposable
{
TextReader impl;
int line = 0;
int unreadChar;
bool haveUnread = false;
public LineNumberingTextReader(TextReader r){
this.impl = r;
}
public int getLineNumber(){
return line;
}
override public int Read(){
int ret;
if(haveUnread)
{
ret = unreadChar;
haveUnread = false;
}
else
ret = impl.Read();
if(ret == '\n')
++line;
return ret;
}
public void unread(int ch){
if(haveUnread)
throw new InvalidOperationException("Can't unread more than once in a row");
unreadChar = ch;
haveUnread = true;
if (ch == '\n')
--line;
}
override public int Peek(){
return impl.Peek();
}
public override void Close()
{
base.Close();
impl.Close();
}
void IDisposable.Dispose()
{
base.Dispose();
impl.Dispose();
}
}
}
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