85 lines
3.7 KiB
Prolog
85 lines
3.7 KiB
Prolog
/* xml_diagnosis.pl : XML exception diagnosis.
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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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:- ensure_loaded( xml_generation ).
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/* xml_fault( +Term, +Indentation, ?SubTerm, ?Path, ?Message ) identifies SubTerm
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* as a sub-term of Term which cannot be serialized after Indentation.
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* Message is an atom naming the type of error; Path is a string encoding a
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* list of SubTerm's ancestor elements in the form <tag>{(id)}* where <tag> is the
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* element tag and <id> is the value of any attribute _named_ id.
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*/
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xml_fault( Term, _Indent, Term, [], "Illegal Variable" ) :-
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var( Term ).
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xml_fault( xml(Attributes,_Content), _Indent, Term, [], Message ) :-
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member( Attribute, Attributes ),
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attribute_fault( Attribute, Term, Message ).
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xml_fault( xml(_Attributes,Content), Indent, Culprit, Path, Message ) :-
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xml_content_fault( Content, Indent, Culprit, Path, Message ).
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xml_fault( Term, _Indent, Term, [], "Illegal Term" ).
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xml_content_fault( Term, _Indent, Term, [], "Illegal Variable" ) :-
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var( Term ).
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xml_content_fault( pcdata(Chars), _Indent, Chars, [], "Invalid Character Data" ) :-
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\+ is_chars( Chars ).
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xml_content_fault( cdata(Chars), _Indent, Chars, [], "Invalid Character Data" ) :-
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\+ is_chars( Chars ).
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xml_content_fault( [H|_T], Indent, Culprit, Path, Message ) :-
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xml_content_fault( H, Indent, Culprit, Path, Message ).
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xml_content_fault( [_H|T], Indent, Culprit, Path, Message ) :-
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xml_content_fault( T, Indent, Culprit, Path, Message ).
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xml_content_fault( namespace(_URI,_Prefix,Element), Indent, Culprit, Path, Message ) :-
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element_fault( Element, [0' |Indent], Culprit, Path, Message ).
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xml_content_fault( Element, Indent, Culprit, Path, Message ) :-
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element_fault( Element, [0' |Indent], Culprit, Path, Message ).
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xml_content_fault( Term, Indent, Term, [], "Illegal Term" ) :-
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\+ generation(Term, "", false, Indent, _Format, _Plus, _Minus ).
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element_fault( element(Tag, _Attributes, _Contents), _Indent, Tag, [], "Tag must be an atom" ) :-
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\+ atom( Tag ).
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element_fault( element(Tag, Attributes, _Contents), _Indent, Tag, [], "Attributes must be instantiated" ) :-
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var( Attributes ).
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element_fault( element(Tag, Attributes, _Contents), _Indent, Faulty, Path, Message ) :-
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fault_path( Tag, Attributes, Path, [] ),
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member( Attribute, Attributes ),
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attribute_fault( Attribute, Faulty, Message ).
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element_fault( element(Tag, Attributes, Contents), Indent, Culprit, Path, Message ) :-
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fault_path( Tag, Attributes, Path, Path1 ),
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xml_content_fault( Contents, Indent, Culprit, Path1, Message ).
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attribute_fault( Attribute, Attribute, "Illegal Variable" ) :-
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var( Attribute ).
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attribute_fault( Name=Value, Name=Value, "Attribute Name must be atom" ) :-
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\+ atom(Name).
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attribute_fault( Name=Value, Name=Value, "Attribute Value must be chars" ) :-
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\+ is_chars( Value ).
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attribute_fault( Attribute, Attribute, "Malformed Attribute" ) :-
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\+ Attribute = (_Name=_Value).
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is_chars( Chars ) :-
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is_list( Chars ),
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\+ (member( Char, Chars ), \+ (integer(Char), Char >=0, Char =< 255)).
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fault_path( Tag, Attributes ) -->
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{atom_codes( Tag, Chars )},
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chars( Chars ),
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fault_id( Attributes ),
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" ".
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fault_id( Attributes ) -->
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{member( id=Chars, Attributes ), is_chars( Chars )},
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!,
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"(", chars(Chars), ")".
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fault_id( _Attributes ) --> "".
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