105 lines
2.9 KiB
Prolog
105 lines
2.9 KiB
Prolog
/* xml.pl : XML Module wrapper for Quintus Prolog.
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*
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* Copyright (C) 2001-2005 Binding Time Limited
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* Copyright (C) 2005-2011 John Fletcher
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*
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* Current Release: $Revision: 3.3 $
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*
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* TERMS AND CONDITIONS:
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*
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* This program is offered free of charge, as unsupported source code. You may
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* use it, copy it, distribute it, modify it or sell it without restriction,
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* but entirely at your own risk.
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*
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*/
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:- module( xml,
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[
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xml_parse/2,
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xml_parse/3,
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xml_subterm/2,
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xml_pp/1,
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load_xml/3,
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load_xml/2
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] ).
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/* @section xml Prolog XML module
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* xml is intended to be a rather modular module: it should be easy to
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* build a program that can output XML, but not read it, or vice versa.
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* Similarly, you may be happy to dispense with diagnosis once you are
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* sure that your code will only try to make valid calls to xml_parse/2.
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*
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* It is intended that the code should be very portable too. Clearly,
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* some small changes will be needed between platforms, but these should
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* be limited to xml_utilities. xml_utilities contains most of the shared
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* code and most of the potentially non-portable code.
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*/
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:- use_module( library(lists), [append/3] ).
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:- use_module( library(readutil) ).
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:- ensure_loaded( xml/xml_driver ).
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/* atom_codes/2, number_codes/2 and throw/1 are ISO predicates, mapped to
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* the Quintus equivalent here.
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*/
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%atom_codes( Atom, Codes ) :-
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% atom_chars( Atom, Codes ).
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%number_codes( Number, Codes ) :-
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% number_chars( Number, Codes ).
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/** @pred xml_exception( +Message, +Document, +Culprit, +Path )
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* a hook to
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* raise an exception to be raised in respect of a fault in the XML Term:
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* Document.
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* - Culprit is a sub-term of Document which cannot be serialized;
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* - Message is an atom naming the type of error;
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* - Path is a string encoding a list of SubTerm's ancestor elements in the
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* form <tag>{(id)}* where <tag> is the element tag and <id> is the value
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* of any attribute _named_ id.
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*/
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xml_exception( Message, Document, Culprit, Path ) :-
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raise_exception(
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application_error('XML Parse: ~s in ~q~nCulprit: ~q~nPath: ~s',
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[Message,Document,Culprit,Path] )
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).
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load_xml(File, XML, []) :-
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open( File, read, S),
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read_stream_to_codes(S, Doc),
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close(S),
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xml_parse(Doc, XML).
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load_xml(File, XML) :-
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open( File, read, S),
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read_stream_to_codes(S, Doc),
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close(S),
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xml_parse(Doc, XML).
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/* member( ?Element, ?List ) holds when Element is a member of List.
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*/
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member( H, [H|_] ).
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member( H, [_|T] ):-
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member( H, T ).
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/* select( ?Element, ?List0, ?List1 ) is true if List1 is equal to List0
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* with Element removed.
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*/
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select( H, [H|T], T ).
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select( Element, [H|T0], [H|T1] ):-
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select( Element, T0, T1 ).
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/* is_list( +List ) holds when List is a list.
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*/
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%is_list( List ) :-
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% nonvar( List ),
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% is_list1( List ).
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%is_list1( [] ).
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%is_list1( [_|_] ).
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