parrt/antlr4 — pull request #123 by sharwell (2012-11-13 19:49:44+00:00)
Title: TestPositionAdjustingLexer

Add an example and unit test for a special "position adjusting lexer" which provides behavior similar to [zero-width positive lookahead assertions](http://msdn.microsoft.com/en-us/library/bs2twtah(v=vs.110\).aspx#zerowidth_positive_lookahead_assertion) in limited scenarios.