Adding properties to expose useful information to derived classes, also ...

[assarbad]

...changed 'file' (a keyword) to 'rcsfile' in the ctor and made self._filename a tuple

I apologize on behalf of my editor which tends to strip trailing whitespace.

The exposed properties allow me to derive a class and do meaningful stuff in that derived class, since all relevant parsing data is now available.

This includes the fixes suggested in Issue #1 of the upstream repo.

As a side-note: your code ran fine with pyparsing 2.0.3.

[xipmix]

Missing piece of this patch

--- a/rcsgrep
+++ b/rcsgrep
@@ -57,7 +57,7 @@ if __name__ == '__main__':
         sys.exit(parser.print_help())
     pattern = args[0]
     for filename in args[1:]:
-        f = RCSFile(file=filename)
+        f = RCSFile(rcsfile=filename)
         for match in f.grep(pattern, format=options.format,
                             wraplines=options.linewraps):
             if options.sep: