On Sun, Jul 09, 2006 at 07:15:07PM -0700, Kevin Tew wrote:
> ../../parrot ../../compilers/pge/pgc.pir
> --output=lib/pruby_grammar_gen.pir lib/pruby.pg
> Method 'reduce' not found
> current instr.: 'parrot;PGE::Exp::Quant;reduce' pc 4358
> (compilers/pge/PGE/Exp.pir:402)
> ...
> pruby.pg is available at http://tewk.com/pruby.pg
This is probably due to a syntax error in the pruby.pg grammar
itself. In particular, the line
token EXPONENT { ( e | E ) ( + | - )? <PRubyGrammar::DIGITS> }
should probably read
token EXPONENT { ( e | E ) ( \+ | - )? <PRubyGrammar::DIGITS> }
After making this change on my system the grammar appears to
compile correctly.
I totally agree that PGE probably needs to provide better syntax
error checking in situations such as this, thus I'm leaving this
ticket open, or will add a new more descriptive one soon.
Also, FWIW, I think that the grammar will read much more cleanly
if the "PRubyGrammar::" qualifiers are taken out of the rules --
they aren't needed if the initial match call is coded correctly.
(Punie uses these in its grammar, and isn't a good model in this
respect.)
For example, I would write the above EXPONENT token as:
token EXPONENT { ( e | E ) ( \+ | - )? <DIGITS> }
or perhaps better is:
token EXPONENT { <[eE]> <[+\-]>? <DIGITS> }
Thanks,
Pm
