Perl 6 Grammars – not only for parsing

Re:Perl 6 Grammars – not only for parsing by Natsu on Tuesday November 23, 2010 @03:51PM (#1935308)

I only know Perl 5, but I can figure out enough of it to give an educated guess. It seems like he's using the token returned by the grammar to select a method of the same name. So when he gets the token e404, he'll call the method e404 which does a make "404: Not found"

The grammar is something new in Perl 6, but it looks like there are a bunch of regexes that match different tokens. That makes me wonder how well it handles a buggy, ambiguous grammar, where the regexes overlap and something could be parsed as a token of two or more types. First rule wins?

Guess I should read some of chromatic's book over Thanksgiving so I'd understand more of this...

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Re:Perl 6 Grammars – not only for parsing by colomon on Tuesday November 23, 2010 @04:15PM (#1935397)

Yes, using

    Mysite.parse($req, :actions(Mysite::Actions.new))

says "Parse $req using grammar Mysite and actions Mysite::Actions.new." When a token is found, the action method with the same name is called. As I understand it, the idea with separating token and action like that is one grammar can be associated with more than one set of actions.

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