On Thu, 2010-09-23 at 16:56 +0200, ben kuin wrote: > Could someone give any idea how I can begin to understand how to write > simple camlp4 extensions?
Shameless self-plug, but I wrote a blog post this summer about my experience figuring out how to do it. I provide a walk-through and explanation of a minimal syntax extension which adds lazy list pattern matching support based on Batteries. The URL: http://www.elehack.net/michael/blog/2010/06/ocaml-syntax-extension I do assume a basic knowledge of parsing context-free grammars, but a generic tutorial on parsing with a tool such as Yacc can fill in that gap. The Wikipedia article[1] may also be helpful. Once you've lept the hurdle of figuring out what pieces you need to write and build a syntax extension, the remaining tricky part is to figure out what pieces of the grammar you need to extend to accomplish your objective. For that, I consult the definition of the OCaml parser in Camlp4OCamlParser.ml in the OCaml source tree. - Michael 1. http://en.wikipedia.org/wiki/Context-free_grammar -- Web/blog: http://elehack.net/michael Jabber/Google Talk: this e-mail address Twitter: http://twitter.com/elehack mouse, n: a device for pointing at the xterm in which you want to type _______________________________________________ Caml-list mailing list. Subscription management: http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list Archives: http://caml.inria.fr Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
