[grammarians] s-expression dumper: works

[MenTaLguY]

On Tue, 2005-12-13 at 20:54 -0500, Duncan Mak wrote:
> Hello,
> 
> I'm trying to use the dump-ruby script, and I'm having trouble running
> it.
> 
> I installed ParseTree and RubyInline using Rubygems and when I try to
> run your script, I see this error message:
> 
> diphthong:~/src/ruby $ ruby dump-ruby.rb hello.rb
> /usr/lib/ruby/gems/1.8/gems/RubyInline-3.5.0/./inline.rb:372:in
> `build': undefined method `+' for nil:NilClass (NoMethodError)

Hmm, I'm using ParseTree 1.3.7 and RubyInline 3.4.0, which may be the
difference.  As far as I know it's not a problem with the script itself,
but rather an incompatibility between the two versions of those
libraries you've got.  Does the parse_tree_show script which comes with
ParseTree work (it does basically the same thing)?

> P.S, Have you looked into RubyLexer at all? The README claims that
> it's more robust than other implementations out there.

RubyLexer is only a lexer, not a full-blown parser.  It is, however,
probably going to be useful as a reference when writing the ANTLR lexer;
thanks!

-mental
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