diff options
Diffstat (limited to 'src/cli/runtime/LineNumberingTextReader.cs')
| -rw-r--r-- | src/cli/runtime/LineNumberingTextReader.cs | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/src/cli/runtime/LineNumberingTextReader.cs b/src/cli/runtime/LineNumberingTextReader.cs index 7ccdc874..71f05e8d 100644 --- a/src/cli/runtime/LineNumberingTextReader.cs +++ b/src/cli/runtime/LineNumberingTextReader.cs @@ -19,6 +19,8 @@ public class LineNumberingTextReader : TextReader, IDisposable {
TextReader impl;
int line = 0;
+ int unreadChar;
+ bool haveUnread = false;
public LineNumberingTextReader(TextReader r){
this.impl = r;
@@ -29,11 +31,27 @@ public class LineNumberingTextReader : TextReader, IDisposable }
override public int Read(){
- int ret = impl.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();
|