[Cardinal-dev] ripper 0.0.5

[David Robins]

On Wed, 20 Nov 2002, Sean Chittenden wrote:

[snip]
> While the grammar may be slightly older, have you tried using ripper?
> If so, I'm curious as to your reactions/thoughts.  -sc

I took a look at it - v0.0.4 gave me the same error as someone on RubyGarden
mentioned (http://www.rubygarden.org/article.php?sid=129) but I tracked down
v0.0.5 (found one bad link, but the correct one is
http://www.loveruby.net/archive/ripper/ripper-0.0.5.tar.gz for those
interested).  Interesting that it's event based, but I'd rather have an AST
that I can traverse and manipulate, and ripper's method calls don't seem to
give any context for the tags (e.g. if I see an operator I want to be able
to get its arguments). There is no documentation whatsoever, except for how
to build it.  Editing test.rb to actually produce some output (basically
change missing_method to puts mid.inspect + " : " + args.each { |i|
i.inspect }.join(" ")) gives output like this:

...
:on__newline :
:on__scan : end
:on__KEYWORD : end
:on__class : R
:on__set_line : 4
:on__local_pop :
:on__scan :
...

It's really too low-level to build a compiler on, IMO (maybe something to
build a parser from - seems to be at that level).  I don't want to know
about whitespace, comments, newlines, or raw scanner tokens.  But if I'm
just using it wrongly and it has the info I want, please enlighten me.

Dave
Isa. 40:31