ANTLREditCreated 6/8/2007, updated 5/18/2017ANTLR is a free parser generator. Official site http://antlr.org/ Documentation See the ANTLR book. Third-party articles A nice article on using ANTLR with Xcode, although it is for the previous version of ANTLR: http://homepage.mac.com/gerard_iglesias/ANTLRWithXcode-Part-1/Text.html antlrwiki