I needed a parser that would match input against a predicate block, like
PPPredicateSequenceParser, but for an unknown/variable length.
For example, whereas for fixed-length matches you can already:
parser := PPPredicateSequenceParser
on: [ :value | value first isUppercase ]
message: 'uppercase 3 letter words'
size: 3.
(parser parse: 'Abc') isPetitFailure not.
Now you can:
parser := PPFlexiblePredicateSequenceParser
on: [ :value | Object canUnderstand: value asSymbol ]
message: 'message to an object'
while: [ :e | e ~= Character space ].
(parser parse: 'hash ijk') isPetitFailure not.
(parser parse: '99 ijk') isPetitFailure.
Is this generally useful enough to add to PetitParser?
For now, you can get it via:
Gofer it
smalltalkhubUser: 'SeanDeNigris' project: 'SeansPlayground';
package: 'PPFlexiblePredicateSequenceParser';
load.
-----
Cheers,
Sean
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