Hi doru
where do we see it?
Stef
On Fri, 20 Jan 2017 16:57:51 +0100, Tudor Girba <tu...@tudorgirba.com>
wrote:
Hi,
When you have questions like these, you can also use the built-in
debugging facilities. For example, in your case, you can see that the
#any parser consumed everything like this:
Cheers,
Doru
On Jan 20, 2017, at 4:38 PM, Norbert Hartl <norb...@hartl.name> wrote:
Am 20.01.2017 um 15:24 schrieb Peter Uhnak <i.uh...@gmail.com>:
Is PetitParser eager by default?
I've used PetitParser countless times so I am really baffled why this
doesn't work
str := 'a0b'.
#any asParser star, #digit asParser, #any asParser star parse: str.
-> PPFailure (input expected at: 3)
PetitParser is not greedy per default. But back tracking only works if
a parser fails. Using , creates a sequence of combined parsers. If one
fails the whole sequence fails. As a star >>parser always succeeds it
would be huge luck if your rule would succeed. The probability that the
parser consumes exactly one character is not high. Maybe negating the
first >>sequence part is what you want
Norbert
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