There was a Parse-inspired project for JavaScript, but I'm not sure to what extent it was developed. There was also a Parse implementation in Topaz[1] (which it

There was a Parse-inspired project for JavaScript, but I'm not sure to what extent it was developed. There was also a Parse implementation in Topaz[1] (which itself is implemented in JavaScript) but is as of now unfinished. It'd be difficult to implement as tightly in another language that doesn't have Rebol's (or a somewhat Lisp-like) free-form code-is-data/data-is-code[2] approach. Rebol and its Parse dialect share the same vocabulary and block structure that amongst other things: makes it easy to insert progress-dependent Rebol snippets within Parse; build Parse blocks dynamically (mid-Parse if needed!); build Rebol code from parsed data; develop complex grammar rules very similar to EBNF[3]. The article linked above[4] (and now linked again below :) does a good job of fleshing out these ideas and why it may remain a unique feature for some time. [1]: http://reb4.me/tt http://reb4.me/tt [2]: http://rebol.info/rebolsteps.html http://rebol.info/rebolsteps.html [3]: http://codereview.stackexchange.com/q/87716/46291 http://codereview.stackexchange.com/q/87716/46291 [4]: http://blog.hostilefork.com/why-rebol-red-parse-cool/ http://blog.hostilefork.com/why-rebol-red-parse-cool/