[DGD] Newbie question regarding parse_string()

[Troels Therkelsen]

Hi all,

I have the following grammar:

  word = /[a-zA-Z]+/
  path = /[^ :]+/

  Grammar: '[' word ']'

With input string "[foo]" it fails (returns nil).  If I remove the path
token from the grammar, it works and returns ({ "[", "foo", "]" }) as
expected.

It's probably my lacking an understanding of how the internals work, but
I thought the parser would only try to match against a token if your
production rules mention it?

I'm guessing it's because path can match '[', 'foo' and ']' (which is
longer than the nothing the word token will match, and the docs say
the longest regex will be matched) so the parser thinks the string
starts with a path token, which means when the production rule asks
for '[' it will already have been taken by the path token.

I'd like for someone with more insights to confirm whether this guess is
true or not, and possibly come up with a solution (path HAS to contain
'[' and ']').

Thanks :-)

Regards,

/Troels Therkelsen

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