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rdfref-query.sty
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rdfref-query.sty
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\ProvidesPackage{rdfref-query}
\RequirePackage{rdfref-core}
\def\Var#1{Variable: #1}
\def\Value#1{Value: #1}
\newcommand\BindVal[2]{%
\IfBeginWith{#2}{?}{%
\ifcsdef{rdfquery@#2}{\def#1{\Value{\csuse{rdfquery@#2}}}}{\def#1{\Var{#2}}}%
}{\def#1{\Value{#2}}}%
}
\newcommand\SaveVal[2]{%
\protected@csedef{rdfquery@#1}{#2}%
}
\newcommand\GetValProperty[2]{%
\expandafter\GetProperty\expandafter{\GetVal{#1}}{#2}%
}
\newcommand\GetVal[1]{%
\csuse{rdfquery@#1}%
}
\newcommand\QueryType[3]{%
\bgroup%
\def\Var##1{v}%
\def\Value##1{l}%
\xdef\qtype{#1#2#3}%
\egroup%
}
\newcommand\DeclareQueryProcessor[2]{%
\long\csgdef{rdfquery@proc@#1}##1{%
\long\def\continue{##1}%
#2}%
}
% v means variable to be looked up, l is searched literal
\DeclareQueryProcessor{vlv}{%
% why we redefine \Value and \Var? I should write comments next time
\def\Value##1{##1}%
\def\Var##1{##1}%
\MapPropertyList\predicate{%
\SaveVal\subject{\ifx\\##1\\\else\First##1\fi}%
\SaveVal\object{\ifx\\##1\\\else\Second##1\fi}%
\continue
}%
}
\DeclareQueryProcessor{vll}{%
% this is first querry processor after two years, I have no idea what
% needs to be done
\def\Value##1{##1}%
\def\Var##1{##1}%
\MapPropertyList\predicate{%
% only do action if searched \object is equal to current objeect
\IfStrEq{\object}{\ifx\\##1\\\else\Second##1\fi}{%
% ##1 is variable passed by \do, two tokens are here:
\SaveVal\subject{\ifx\\##1\\\else\First##1\fi}%
% \SaveVal\predicate{\ifx\\##1\\\else\Second##1\fi}% no need to save predicate, as we are looking only for subject in this query processor
\continue}{}%
}%
}
\DeclareQueryProcessor{llv}{%
\def\Value##1{##1}%
\def\Var##1{##1}%
% Subject can have multiple values of property, so we need to loop over them
\MapPropertyList\predicate{%
\IfStrEq\subject{\ifx\\##1\\\else\First##1\fi}{%
\SaveVal\object{\ifx\\##1\\\else\Second##1\fi}%
\continue}{}%
}%
}%
\DeclareQueryProcessor{lvv}{%
\def\Value##1{##1}%
\def\Var##1{##1}%
\MapSubjectList\subject{%
\SaveVal\predicate{\ifx\\##1\\\else\First##1\fi}%
\SaveVal\object{\ifx\\##1\\\else\Second##1\fi}%
\continue%
}%
}
\DeclareQueryProcessor{lvl}{%
\def\Value##1{##1}%
\def\Var##1{##1}%
\MapSubjectList\subject{%
% \IfStrEq{\GetProperty{\subject}{##1}}{\object}{%
\IfStrEq{\ifx\\##1\\\else\Second##1\fi}{\object}{%
\SaveVal\predicate{\ifx\\##1\\\else\First##1\fi}%
\continue%
}{}%
}%
}
\DeclareQueryProcessor{lll}{%
\def\Value##1{##1}%
\def\Var##1{##1}%
\IfStrEq{\GetPropertyNoCheck{\subject}{\predicate}}{\object}{\continue}{}%
}
\newcommand\Bind[4]{%
\bgroup%
\BindVal\subject{#1}%
\BindVal\predicate{#2}%
\BindVal\object{#3}%
\QueryType\subject\predicate\object%
\ifcsdef{rdfquery@proc@\qtype}{\csuse{rdfquery@proc@\qtype}{#4}}{\typeout{\detokenize{Unknown RDF query processor:} \qtype}}%
\egroup%
}
% what is the purpose of this command?
\newcommand\OptionalBind[3]{%
%\bgroup%
\BindVal\subject{#1}%
\BindVal\predicate{#2}%
\BindVal\object{#3}%
\QueryType\subject\predicate\object%
\ifcsdef{rdfquery@proc@\qtype}{\csuse{rdfquery@proc@\qtype}{}}{\typeout{\detokenize{Unknown RDF query processor:} \qtype}}%
%#4
%\egroup%
}
\endinput