12 Nov
2010
12 Nov
'10
12:25 a.m.
I've been playing with PetitParser and I keep running into what seems like a
common case. I want to skip everything up to the first match of my second
parser.
For example, if I don't care about anything in a string that comes before
'dd', I write:
parser2 := 'dd' asParser negate plus, 'dd' asParser ==> [ :nodes |
nodes
second ].
parser2 parse: 'kslkxjclkxjcdd'. "Returns 'dd'"
This gets the job done, but seems awkward. What's the most elegant way?
I thought maybe "'dd' asParser not plus, 'dd' asParser."
But the image just hangs.
Thanks.
Sean
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12 Nov
12 Nov
12:29 a.m.
Hi Sean,
#negate is the way to go. #not does not consume the stream.
Cheers,
Doru
On 12 Nov 2010, at 00:25, Sean P. DeNigris wrote:
I've been playing with PetitParser and I keep running into what seems like a
common case. I want to skip everything up to the first match of my second
parser.
For example, if I don't care about anything in a string that comes before
'dd', I write:
parser2 := 'dd' asParser negate plus, 'dd' asParser ==> [ :nodes |
nodes
second ].
parser2 parse: 'kslkxjclkxjcdd'. "Returns 'dd'"
This gets the job done, but seems awkward. What's the most elegant way?
I thought maybe "'dd' asParser not plus, 'dd' asParser."
But the image just hangs.
Thanks.
Sean
--
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http://forum.world.st/PetitParser-skip-everything-up-to-X-tp3038824p3038824…
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12:36 a.m.
What do you think of adding it to the API?
Something like http://forum.world.st/file/n3038839/PPParser-skipUntil.st
PPParser-skipUntil.st :
PPParser>>skipUntil
^ self negate plus, self ==> [ :nodes | nodes second ].
parser2 := 'dd' asParser skipUntil.
parser2 parse: 'kslkxjclkxjcdd'. "Returns 'dd'"
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3:40 a.m.
I doubt this is generally useful. Sometimes you might want the skipped
input, sometimes you might want it as a token, sometimes as a trimmed
token, sometimes you need the end as a token, sometimes the end as a
trimmed token, sometimes both or a combination of any of the two.
Lukas
On 11 November 2010 20:36, Sean P. DeNigris <sean(a)clipperadams.com> wrote:
What do you think of adding it to the API?
Something like http://forum.world.st/file/n3038839/PPParser-skipUntil.st
PPParser-skipUntil.st :
PPParser>>skipUntil
^ self negate plus, self ==> [ :nodes | nodes second ].
parser2 := 'dd' asParser skipUntil.
parser2 parse: 'kslkxjclkxjcdd'. "Returns 'dd'"
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Lukas Renggli
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5:57 a.m.
Lukas Renggli wrote:
I doubt this is generally useful. Sometimes you might want the skipped
input, sometimes you might want it as a token, sometimes as a trimmed
token, sometimes you need the end as a token, sometimes the end as a
trimmed token, sometimes both or a combination of any of the two.
Okay, thanks for the reply. I'm really enjoying PetitParser!
Sean
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9:34 a.m.
+1
Doru
On 12 Nov 2010, at 03:40, Lukas Renggli wrote:
I doubt this is generally useful. Sometimes you might
want the skipped
input, sometimes you might want it as a token, sometimes as a trimmed
token, sometimes you need the end as a token, sometimes the end as a
trimmed token, sometimes both or a combination of any of the two.
Lukas
On 11 November 2010 20:36, Sean P. DeNigris <sean(a)clipperadams.com> wrote:
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What do you think of adding it to the API?
Something like http://forum.world.st/file/n3038839/PPParser-skipUntil.st
PPParser-skipUntil.st :
PPParser>>skipUntil
^ self negate plus, self ==> [ :nodes | nodes second ].
parser2 := 'dd' asParser skipUntil.
parser2 parse: 'kslkxjclkxjcdd'. "Returns 'dd'"
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5 comments
3 participants
participants (3)
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Lukas Renggli -
Sean P. DeNigris -
Tudor Girba