79 lines
1.7 KiB
Plaintext
79 lines
1.7 KiB
Plaintext
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:- object(xml).
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:- info([
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version is 1.0,
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date is 2003/7/7,
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author is 'Paulo Moura',
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comment is 'Conversion between compound terms and XML.']).
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:- public(convert/3).
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:- mode(convert(@compound, @compound, -atom), zero_or_one).
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:- mode(convert(-compound, -compound, +atom), zero_or_one).
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:- info(convert/3, [
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comment is 'Converts between a compound term and an interpretation and XML.',
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argnames is ['Term', 'Interpretation', 'XML']]).
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convert(Term, Interpretation, XML) :-
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var(XML) ->
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phrase(term(Term, Interpretation), List),
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atom_codes(XML, List)
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;
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atom_codes(XML, List),
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phrase(term(Term, Interpretation), List).
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term(Term, Interpretation) -->
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{nonvar(Term), nonvar(Interpretation),
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Interpretation =.. [Functor| Tags], Term =.. [Functor| Args]},
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open_tag(Functor),
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arguments(Tags, Args),
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close_tag(Functor).
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term(Term, Interpretation) -->
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{var(Term), var(Interpretation)},
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open_tag(Functor),
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arguments(Tags, Args),
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close_tag(Functor),
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{Interpretation =.. [Functor| Tags], Term =.. [Functor| Args]}.
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arguments([], []) -->
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[].
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arguments([Tag| Tags], [Arg| Args]) -->
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open_tag(Tag),
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value(Arg),
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close_tag(Tag),
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arguments(Tags, Args).
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open_tag(Tag) -->
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"<", value(Tag), ">".
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close_tag(Tag) -->
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"</", value(Tag), ">".
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value(Value) -->
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{nonvar(Value), atom_codes(Value, Codes)}, characters(Codes).
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value(Value) -->
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{var(Value)}, characters(Codes), {atom_codes(Value, Codes)}.
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characters([]) --> [].
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characters([Code| Codes]) --> [Code], {character(Code)}, characters(Codes).
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character(Code) :- Code @>= 0'a, Code @=< 0'z, !.
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character(Code) :- Code @>= 0'A, Code @=< 0'Z.
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:- end_object.
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