Re: [CEDET-devel] my first (lame) stab at wisent javascript parser

[David P. <dav...@wa...>]

Hi Joakim,

> I made a first stab simple wisent javascript parser.
> (its lame and incomplete, so dont be too amazed)
> 
> Now Im having difficulty testing the parser.
> How do I make it execute reliably in a javascript buffer?
> 
> I thought the %languagemode tag was supposed to set this up.
> 
> Is it suficient to do
> (wisent-javascript-jv-wy--install-parser)
> from a mode hook?
> 
> Currently I just do:
> 
> - compile the wy file with:
> (semantic-grammar-batch-build-one-package "wisent-javascript-jv.wy")
> - eval the resulting .el buffer
> - make a .js buffer 
> - ecmascript mode
> - wisent-javascript-jv-wy--install-parser
> 
> 
> Which doesnt work very reliably. Sometimes I get messages like "the
> buffer wasnt set up for parsing"

The orthodox way to setup a semantic parser is to provide a support
library where you will put your language specific code.  You could
create a wisent-javascript-jv.el file which should at least contain
the following:

----- cut here
(require 'wisent-javascript-jv-wy)

;;;###autoload
(defun wisent-javascript-jv-default-setup ()
  "Hook run to setup Semantic in `ecmascript-mode'."
  ;; Use the Wisent LALR(1) parser to analyze Javascript sources.
  (wisent-javascript-jv-wy--install-parser)
  (setq
   ;; Lexical analysis
   semantic-lex-number-expression semantic-java-number-regexp
   semantic-lex-depth nil ;; Full lexical analysis
   semantic-lex-analyzer 'javascript-lexer
   ))

(add-hook 'ecmascript-mode-hook 'wisent-javascript-jv-default-setup)

(provide 'wisent-javascript-jv)
----- cut here

After that library has been loaded, semantic should be setup in
buffers opened in `ecmascript-mode'.

> Since "defconst" statements are generated, I must change those to
> setq:s when regenerating the grammar el file.

While editing the grammar file, that should be done automatically by:

M-x semantic-grammar-create-package (bound to C-c C-c)

> In the end I would like this parser to:
> - give me information about keywords
> - complain about bad syntax
> - do completion

All that should be provided by the semantic core when your grammar
will produce semantic tags and the necessary javascript versions of
some overload functions.  Looking at the semantic documentation (and
helping improve it ;) ) and at the code in wisent-java.el is a good
starting point. Of course you can continue to ask for help in the
cedet-devel ML, and we will try to help you as our time will permit.

Thanks for working on that!
Good luck!

David