mirror of
https://github.com/samsonjs/elisp.js.git
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77f1a9eb93
Sorry for the massive commit. I'll try not to do this. Several new features: * Proper conses and lists (probably slow, can optimize later) * Parse negative numbers * Regular expressions (piggyback off js regex, not emacs compatible) * string-match and symbol-name primitives * if special form * car, cdr, cadr, caddr, cadddr, nth, nthcdr, map, length, null, symbolp, listp, stringp, numberp, etc. only in JS now but I will expose them in lisp as primitives soon. Fixed: * setq now silently defines undefined variables some miscellaneous things: * simple init system to specify init code that loads after all defs have been read * String.camelize function stolen from Prototype
89 lines
2.7 KiB
Text
89 lines
2.7 KiB
Text
Emacs Lisp implementation in JavaScript.
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Copyright (c) 2009 Sami Samhuri - sami.samhuri@gmail.com
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Released under the terms of the MIT license. See the included file
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LICENSE.
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Latest version available on github:
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http://github.com/samsonjs/elisp.js
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Introduction
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(or "You must be kidding")
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==========================
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I'm not 100% sure why I think this might be useful to somebody. The
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idea of editing code directly on github or bitbucket in a web browser
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is pretty cool though, and if you're going to do such a thing why not
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use the best tools available. IMO those tools are written in Emacs
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Lisp so I would like to use them in the browser. Maybe with some
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HTML5 offline goodness thrown in.
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Seeing Ymacs[1] in action[2] was also an inspiration to start this
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project as I've had it on my TODO list for several months now. Emacs
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in the browser could be a reality; Ymacs is proof.
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[1] http://www.ymacs.org/
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[2] http://www.ymacs.org/demo/
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Getting Started
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===============
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I use Emacs and js-comint.el[3] with inferior-js set to
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/opt/local/bin/js, which is SpiderMonkey[4] from MacPorts[5] on Snow
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Leopard. C-c b sends the buffer to the JS repl and then I use the
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EL.rep (read-eval-print), EL.repl, EL.parse, EL.eval, and EL.print
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functions defined in the section titled Lisp Support near the end of
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el.js.
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[3] http://js-comint-el.sourceforge.net/
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[4] http://www.mozilla.org/js/spidermonkey/
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[5] http://www.macports.org/
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Running js under rlwrap and then using load('el.js') works just as
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well if you don't use Emacs but still want readline. Type EL.repl()
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to start the REPL or evaluate one thing with EL.rep,
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e.g. El.rep("(* 4 3)")
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There are other interfaces into the parser and evaluator besides the
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shortcuts. new EL.Parser([input]) returns a parser object and likewise
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new EL.Evaluator([exprs]) returns an evaluator object.
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Mainly toy functions that do extremely simple operations on numbers
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and strings can be implemented right now. Stay tuned, or better yet
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hack away and submit a pull request on github[6].
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[6] http://github.com/samsonjs/elisp.js
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What's here?
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============
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Not much compared to the real thing but it's a decent start for < 1000
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lines.
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* parser
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(ints, floats, strings, symbols, lists, quoted expressions)
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* symbol table
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(functions & variables separate)
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* (broken) lexical scoping
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* expression evaluator
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* simple tagged primitive types
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(string, symbol, primitive, function, number)
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* special forms for defvar, defun, set, setq, and quote
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* eval/apply for atoms, function calls, and a few special forms
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* a few primitive math ops
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(thanks to JS' overloading + works on strings too)
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* 2 horrible print functions
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(JS "pretty" printer & a half-assed Lisp print)
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