[grammarians] starting over from scratch

[Mauricio Fernández]

On Sun, Nov 27, 2005 at 02:15:45PM -0800, Terence Parr wrote:
> Ok, so the parse.y grammar has lots of duplicated grammar fragments  
> so yacc can figure out how to do different actions depending on  
> context.  Further there is lots of weird stuff going on to resolve  
> ambiguities and be as tight as possible.  Some of it is beyond my ken  
> giving my ruby nuby-ness.  The lexer seems mostly or all handwritten;  
> haven't looked at it much.
> 
> I'm building a grammar from scratch starting with assignments. :)
> 
> Damn thing even seems to be working...

Have you seen the following?

EBNF corresponding to Ruby 1.4
http://www.outerbody.com/ruby/ruby-man-1.4/yacc.html

The same with some changes towards Ruby 1.6
http://www.ruby-lang.org/ja/man/?cmd=view;name=%B5%BF%BB%F7BNF%A4%CB%A4%E8%A4%EBRuby%A4%CE%CA%B8%CB%A1

"Ruby's grammar"
http://www.ruby-lang.org/ja/man/?cmd=view;name=Ruby%A4%CE%CA%B8%CB%A1

-- 
Mauricio Fernandez