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yap-6.3/packages/xml/xml.pl

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2016-01-06 12:43:51 +00:00
/* xml.pl : XML Module wrapper for Quintus Prolog.
*
* Copyright (C) 2001-2005 Binding Time Limited
* Copyright (C) 2005-2011 John Fletcher
*
* Current Release: $Revision: 3.3 $
*
* TERMS AND CONDITIONS:
*
* This program is offered free of charge, as unsupported source code. You may
* use it, copy it, distribute it, modify it or sell it without restriction,
* but entirely at your own risk.
*
*/
:- module( xml,
[
xml_parse/2,
xml_parse/3,
xml_subterm/2,
xml_pp/1,
load_xml/3,
load_xml/2
] ).
/* @section xml Prolog XML module
* xml is intended to be a rather modular module: it should be easy to
* build a program that can output XML, but not read it, or vice versa.
* Similarly, you may be happy to dispense with diagnosis once you are
* sure that your code will only try to make valid calls to xml_parse/2.
*
* It is intended that the code should be very portable too. Clearly,
* some small changes will be needed between platforms, but these should
* be limited to xml_utilities. xml_utilities contains most of the shared
* code and most of the potentially non-portable code.
*/
:- use_module( library(lists), [append/3] ).
:- use_module( library(readutil) ).
:- ensure_loaded( xml/xml_driver ).
/* atom_codes/2, number_codes/2 and throw/1 are ISO predicates, mapped to
* the Quintus equivalent here.
*/
%atom_codes( Atom, Codes ) :-
% atom_chars( Atom, Codes ).
%number_codes( Number, Codes ) :-
% number_chars( Number, Codes ).
/** @pred xml_exception( +Message, +Document, +Culprit, +Path )
* a hook to
* raise an exception to be raised in respect of a fault in the XML Term:
* Document.
* - Culprit is a sub-term of Document which cannot be serialized;
* - Message is an atom naming the type of error;
* - Path is a string encoding a list of SubTerm's ancestor elements in the
* form <tag>{(id)}* where <tag> is the element tag and <id> is the value
* of any attribute _named_ id.
*/
xml_exception( Message, Document, Culprit, Path ) :-
raise_exception(
application_error('XML Parse: ~s in ~q~nCulprit: ~q~nPath: ~s',
[Message,Document,Culprit,Path] )
).
load_xml(File, XML, []) :-
open( File, read, S),
read_stream_to_codes(S, Doc),
close(S),
xml_parse(Doc, XML).
load_xml(File, XML) :-
open( File, read, S),
read_stream_to_codes(S, Doc),
close(S),
xml_parse(Doc, XML).
/* member( ?Element, ?List ) holds when Element is a member of List.
*/
member( H, [H|_] ).
member( H, [_|T] ):-
member( H, T ).
/* select( ?Element, ?List0, ?List1 ) is true if List1 is equal to List0
* with Element removed.
*/
select( H, [H|T], T ).
select( Element, [H|T0], [H|T1] ):-
select( Element, T0, T1 ).
/* is_list( +List ) holds when List is a list.
*/
%is_list( List ) :-
% nonvar( List ),
% is_list1( List ).
%is_list1( [] ).
%is_list1( [_|_] ).