54 lines
993 B
Plaintext
54 lines
993 B
Plaintext
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% Categories allows us to neatly organize the different "kinds"
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% of words on this example: determiners, nouns, and verbs
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:- category(determiners).
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:- private(determiner//0). % private category non-terminals become private
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% non-terminals of the objects importing the category
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determiner --> [the].
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determiner --> [a].
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:- end_category.
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:- category(nouns).
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:- private(noun//0).
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noun --> [boy].
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noun --> [girl].
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:- end_category.
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:- category(verbs).
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:- private(verb//0).
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verb --> [likes].
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verb --> [hates].
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:- end_category.
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:- object(sentence,
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implements(parsep),
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imports(determiners, nouns, verbs)).
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parse(List, true) :-
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phrase(sentence, List).
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parse(_, false).
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sentence --> noun_phrase, verb_phrase.
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noun_phrase --> ::determiner, ::noun. % the ::/1 control construct is used to call grammar
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noun_phrase --> ::noun. % rules encapsulated on the imported categories
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verb_phrase --> ::verb.
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verb_phrase --> ::verb, noun_phrase.
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:- end_object.
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