Forums | Admin Discussion Forums: help Start New Thread Nested Flat Threaded Ultimate Show 25 Show 50 Show 75 Show 100   By: James Gray RE: lookahead [ reply ]   2008-02-04 19:10 Ghost Wheel supports look-ahead rules, but I haven't yet added them into the grammar syntax. If you are using the Ruby DSL though, you can create them as shown in these tests: assert_equal( LookAhead.new(Literal.new("one")), @builder.look(@builder.lit("one")) ) assert_equal( LookAhead.new(Literal.new("one"), true), @builder.nlook(@builder.lit("one")) ) assert_equal( LookAhead.new(Literal.new("one"), true), @builder.look(true, @builder.lit("one")) ) assert_equal( LookAhead.new(Literal.new("one"), true), @builder.look(@builder.lit("one"), true) ) Basically, you want the nlook() method. By: Daniel Brumbaugh-Keeney lookahead [ reply ]   2008-02-03 01:39 How do I do a zero-width negative lookahead? In Treetop this would be !rule