2001-06-06 20:40:57 +01:00
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:- category(attributes).
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:- info([
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version is 1.0,
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2003-02-05 00:15:28 +00:00
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author is 'Paulo Moura',
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2001-06-06 20:40:57 +01:00
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date is 2000/7/24,
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comment is 'Dynamic attributes dictionary.']).
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:- public(attribute/2).
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:- mode(attribute(?nonvar, ?nonvar), zero_or_more).
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:- info(attribute/2,
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[comment is 'Returns, by backtracking, all pairs of atribute-values.',
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argnames is ['Attribute', 'Value']]).
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:- public(attributes/1).
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:- mode(attributes(-list), one).
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:- info(attributes/1,
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[comment is 'List of all pairs of atribute-values.',
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argnames is ['Attributes']]).
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:- private(attribute_/2).
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:- dynamic(attribute_/2).
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:- mode(attribute_(?nonvar, ?nonvar), zero_or_more).
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:- info(attribute_/2,
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[comment is 'Stores attributes values.',
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argnames is ['Attribute', 'Value']]).
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:- public(del_attribute/2).
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:- mode(del_attribute(?nonvar, ?nonvar), zero_or_more).
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:- info(del_attribute/2,
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[comment is 'Deletes a matching attribute-value pair.',
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argnames is ['Attribute', 'Value']]).
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:- public(del_attributes/2).
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:- mode(del_attributes(@term, @term), one).
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:- info(del_attributes/2,
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[comment is 'Deletes all matching attribute-value pairs.',
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argnames is ['Attribute', 'Value']]).
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:- public(set_attribute/2).
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:- mode(set_attribute(+nonvar, +nonvar), one).
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:- info(set_attribute/2,
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[comment is 'Sets an attribute value.',
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argnames is ['Attribute', 'Value']]).
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:- public(set_attributes/1).
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:- mode(set_attributes(+list), one).
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:- info(set_attributes/1,
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[comment is 'Sets a list of attribute-value pairs.',
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argnames is ['Attributes']]).
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attribute(Attribute, Value) :-
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::attribute_(Attribute, Value).
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attributes(Attributes) :-
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findall(Attribute, ::attribute_(Attribute, _), Attributes).
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del_attribute(Attribute, Value) :-
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::retract(attribute_(Attribute, Value)).
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del_attributes(Attribute, Value) :-
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::retractall(attribute_(Attribute, Value)).
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set_attribute(Attribute, Value) :-
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::retractall(attribute_(Attribute, _)),
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::assertz(attribute_(Attribute, Value)).
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set_attributes([]).
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set_attributes([Attribute-Value| Attributes]) :-
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::retractall(attribute_(Attribute, _)),
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::assertz(attribute_(Attribute, Value)),
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set_attributes(Attributes).
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:- end_category.
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