Re: YACC, Bison, lex, flex Modes for emacs

Tom Hampton wrote:
>After searching for a mode for the above, I found bison-mode.el which
>many of you have probably found as inadequate as I did. I am
>seriously considering writing Emacs major modes for the above
>languages.


For the YACC mode i might suggest a function that automagically formats the
grammar according to the specified user style (a la `set-c-style').


two example styles (widely used) may be:


-- 1 -----------------------------------
translation_unit:
/* epsilon */
| declaration_list
;


declaration_list:
declaration
| declaration_list declaration
;
-- 2 -----------------------------------
translation_unit
: /* epsilon */
| declaration_list
;


declaration_list
: declaration
| declaration_list declaration
;
----------------------------------------


The YACC mode might have a function to hide/show the action code written in
the grammar, i.e.:


- 1(hide) ------------------------------------
declaration_list:
declaration
{ ... }
| declaration_list declaration
{ ... }
;
- 2(show) ------------------------------------
declaration_list:
declaration
{ $$ = $1; /* ... */ }
| declaration_list declaration
{ $$ = link($1, $2); /* ...*/ }
;
----------------------------------------------


The YACC major-mode might also warn when a semicolon is missing
before saving.


----------------------
foo
: bar
| baz
<-------- like here
bar
: quux
;
---------------------


Just my Lit. 0.02.


Regards,
sandro


--

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