\ProvidesFile{numeric-comp.cbx}
[\abx@cbxid]

\newtoggle{cbx:subentrycomp}
\DeclareBiblatexOption{global,type,entry}[boolean]{subentrycomp}[true]{%
  \settoggle{cbx:subentrycomp}{#1}}

\ExecuteBibliographyOptions{labelnumber,sortcites,autocite=inline,
  subentrycomp=true}

\renewcommand*{\multicitedelim}{\addcomma\space}
\renewcommand*{\iffinalcitedelim}{%
  \ifnumequal{\value{textcitecount}}{\value{textcitetotal}-1}}

\providebool{bbx:subentry}
\newbool{cbx:parens}

\newcounter{cbx@tempcnta}% no. of labelnumbers skipped
\newcounter{cbx@tempcntb}% 'predicted' labelnumber for current cite
\newcounter{cbx@tempcntc}% no. of entrysetcounts we skipped
\newcounter{cbx@tempcntd}% 'predicted' entrysetcount

\DeclareFieldFormat{entrysetcount}{\mknumalph{#1}}

\newcommand*{\cbx@iflabelnumberequalslast}{%
  \iffieldequals{labelnumber}{\cbx@lastnumber}}

% \iffieldequals is false even if both are empty/undef
% so we need a special test for that case
% this test is optimised for performance and laziness
% rather than prettiness, not that it would matter a lot...
\newcommand*{\cbx@iflabelprefixequalslast}{%
  \ifundef\cbx@lastprefix
    {\iffieldundef{labelprefix}}
    {\iffieldequals{labelprefix}{\cbx@lastprefix}}}

% \cbx@iflabelnumberequalslast and \cbx@iflabelprefixequalslast
\newcommand*{\cbx@iflabelnumberandprefixequallast}{%
  \cbx@iflabelnumberequalslast
    {\cbx@iflabelprefixequalslast}
    {\@secondoftwo}}

\newbibmacro*{cite:init}{%
  \global\boolfalse{cbx:parens}%
  \global\undef\cbx@lasthash
  \global\undef\cbx@lastnumber
  \global\undef\cbx@lastprefix
  \global\undef\cbx@lastentrysetcount
  \setcounter{cbx@tempcnta}{0}%
  \setcounter{cbx@tempcntb}{-2}%
  \setcounter{cbx@tempcntc}{0}%
  \setcounter{cbx@tempcntd}{-1}}

\newbibmacro*{cite:comp}{%
  \stepcounter{cbx@tempcntb}%
  \iffieldundef{shorthand}
    {\ifbool{bbx:subentry}
       {\iffieldundef{entrysetcount}
          {\usebibmacro{cite:comp:comp}}
          {\usebibmacro{cite:comp:inset}}}
       {\usebibmacro{cite:comp:comp}}}
    {\usebibmacro{cite:comp:shand}}}

% we externalise printing the citations to
% cite:print:... macros for easier customisation

\newbibmacro*{cite:comp:comp}{%
  \cbx@iflabelprefixequalslast
    {\ifnumequal{\thefield{labelnumber}}{\value{cbx@tempcntb}}
       {\savefield{entrykey}{\cbx@lastkey}%
        \savefield{labelnumber}{\cbx@lastnumber}%
        \stepcounter{cbx@tempcnta}}
       {\ifnumequal{\thefield{labelnumber}}{\value{cbx@tempcntb}-1}
          {% current cite is *exactly* the same a previous source
           % this can only happen if the same source is cited twice
           % and sortcites is turned off
           % print nothing
          }
          {\usebibmacro{cite:comp:end}}}}
    {\usebibmacro{cite:comp:end}}%
  \setcounter{cbx@tempcntb}{\thefield{labelnumber}}%
  \savefield{labelprefix}{\cbx@lastprefix}}

\newbibmacro*{cite:comp:end}{%
  \usebibmacro{cite:dump}%
  \ifnumgreater{\value{cbx@tempcntb}}{-1}
    {\setunit{\multicitedelim}}
    {}%
  \usebibmacro{cite:print:labelnumber}}

\newbibmacro*{cite:comp:inset}{%
  \stepcounter{cbx@tempcntd}%
  \ifboolexpr{    togl {cbx:subentrycomp}
              and test {\cbx@iflabelnumberandprefixequallast}}
    {\ifnumequal{\thefield{entrysetcount}}{\value{cbx@tempcntd}}
       {\savefield{entrykey}{\cbx@lastkey}%
        \savefield{entrysetcount}{\cbx@lastentrysetcount}%
        \stepcounter{cbx@tempcntc}}
       {\ifnumequal{\thefield{entrysetcount}}{\value{cbx@tempcntd}-1}
          {% current cite is *exactly* the same a previous source
           % this can only happen if the same source is cited twice
           % and sortcites is turned off
           % print nothing
          }
          {\usebibmacro{cite:dump:inset}%
           \ifnumgreater{\value{cbx@tempcntd}}{-1}
             {\setunit{\multicitesubentrydelim}}
             {}%
           \usebibmacro{cite:print:subentry:comp}}}}
    {\usebibmacro{cite:dump}%
     \ifnumgreater{\value{cbx@tempcntb}}{-1}
       {\multicitedelim}
       {}%
     \setcounter{cbx@tempcntd}{-1}%
     \usebibmacro{cite:print:subentry:full}%
     \savefield{labelprefix}{\cbx@lastprefix}%
     \savefield{labelnumber}{\cbx@lastnumber}}%
    \setcounter{cbx@tempcntd}{\thefield{entrysetcount}}%
    \setcounter{cbx@tempcntb}{-1}}

\newbibmacro*{cite:comp:shand}{%
  \usebibmacro{cite:dump}%
  \ifnumgreater{\value{cbx@tempcntb}}{-1}
    {\setunit{\multicitedelim}}
    {}%
  \usebibmacro{cite:print:shorthand}%
  \setcounter{cbx@tempcntb}{-1}}

\newbibmacro{cite:dump:inset}{%
  % dump subentry
  \ifnumgreater{\value{cbx@tempcntc}}{0}
    {\ifnumgreater{\value{cbx@tempcntc}}{1}
       {\setunit{\multicitesubentryrangedelim}}
       {\setunit{\multicitesubentrydelim}}%
     \usebibmacro{cite:print:last:subentry:comp}%
     \global\undef\cbx@lastentrysetcount}
    {}%
  \setcounter{cbx@tempcntc}{0}%
}

\newbibmacro*{cite:dump}{%
  \usebibmacro{cite:dump:inset}%
  % dump labelnumber (+labelprefix)
  \ifnumgreater{\value{cbx@tempcnta}}{0}
    {\ifnumgreater{\value{cbx@tempcnta}}{1}
       {\setunit{\multiciterangedelim}}
       {\setunit{\multicitedelim}}%
     \usebibmacro{cite:print:last:labelnumber}%
     \global\undef\cbx@lastprefix}
    {}%
  \setcounter{cbx@tempcnta}{0}%
}

% these macros do the actual printing

\newbibmacro*{cite:print:shorthand}{%
  \printtext[bibhyperref]{\printfield{shorthand}}}

\newbibmacro*{cite:print:labelnumber}{%
  \printtext[bibhyperref]{%
    \printfield{labelprefix}%
    \printfield{labelnumber}}}

\newbibmacro*{cite:print:subentry:comp}{%
  \printtext[bibhyperref]{\printfield{entrysetcount}}}

\newbibmacro*{cite:print:subentry:full}{%
  \printtext[bibhyperref]{%
    \printfield{labelprefix}%
    \printfield{labelnumber}%
    \printfield{entrysetcount}}}

\DeclareFieldFormat{bibhyperref:lastkey}{\bibhyperref[\cbx@lastkey]{#1}}

\newbibmacro*{cite:print:last:subentry:comp}{%
  \printtext[bibhyperref:lastkey]{%
    \printtext[entrysetcount]{\cbx@lastentrysetcount}}}

\newbibmacro*{cite:print:last:labelnumber}{%
  \printtext[bibhyperref:lastkey]{%
    \ifdef\cbx@lastprefix
      {\printtext[labelprefix]{\cbx@lastprefix}}
      {}%
    \printtext[labelnumber]{\cbx@lastnumber}}}

\newbibmacro*{textcite}{%
  \iffieldequals{namehash}{\cbx@lasthash}
    {\usebibmacro{cite:comp}}
    {\usebibmacro{cite:dump}%
     \ifbool{cbx:parens}
       {\printtext{\bibclosebracket}\global\boolfalse{cbx:parens}}
       {}%
     \iffirstcitekey
       {}
       {\setunit{\textcitedelim}}%
     \usebibmacro{cite:init}%
     \ifnameundef{labelname}
       {\printfield[citetitle]{labeltitle}}
       {\printnames{labelname}}%
     \setunit*{\printdelim{namelabeldelim}}%
     \printtext{\bibopenbracket}\global\booltrue{cbx:parens}%
     \ifnumequal{\value{citecount}}{1}
       {\usebibmacro{prenote}}
       {}%
     \usebibmacro{cite:comp}%
     \stepcounter{textcitecount}%
     \savefield{namehash}{\cbx@lasthash}}}

\DeclareCiteCommand{\cite}[\mkbibbrackets]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite:comp}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}}

\DeclareCiteCommand{\parencite}[\mkbibbrackets]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite:comp}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}}

\DeclareCiteCommand{\footcite}[\mkbibfootnote]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite:comp}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}}

\DeclareCiteCommand{\footcitetext}[\mkbibfootnotetext]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite:comp}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}}

\DeclareCiteCommand{\smartcite}[\iffootnote\mkbibbrackets\mkbibfootnote]
  {\usebibmacro{cite:init}%
   \usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite:comp}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}}

\DeclareCiteCommand{\supercite}[\mkbibsuperscript]
  {\usebibmacro{cite:init}%
   \let\multicitedelim=\supercitedelim
   \let\multicitesubentrydelim=\supercitesubentrydelim
   \let\multiciterangedelim=\superciterangedelim
   \let\multicitesubentryrangedelim=\supercitesubentryrangedelim
   \iffieldundef{prenote}
     {}
     {\BibliographyWarning{Ignoring prenote argument}}%
   \iffieldundef{postnote}
     {}
     {\BibliographyWarning{Ignoring postnote argument}}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite:comp}}
  {}
  {\usebibmacro{cite:dump}}

\DeclareCiteCommand{\cbx@textcite}
  {\usebibmacro{cite:init}}
  {\usebibmacro{citeindex}%
   \usebibmacro{textcite}}
  {}
  {\usebibmacro{cite:dump}%
   \usebibmacro{postnote}%
   \ifbool{cbx:parens}
     {\bibclosebracket\global\boolfalse{cbx:parens}}
     {}}

\DeclareCiteCommand{\textcite}[\cbx@textcite@init\cbx@textcite]
  {\gdef\cbx@savedkeys{}%
   \citetrackerfalse%
   \pagetrackerfalse%
   \DeferNextCitekeyHook%
   \usebibmacro{cite:init}}
  {\ifboolexpr{test {\iffirstcitekey}
               and test {\ifnumgreater{\value{multicitetotal}}{0}}}
     {\protected@xappto\cbx@savedcites{()(\thefield{multipostnote})}%
      \global\clearfield{multipostnote}}
     {}%
   \xappto\cbx@savedkeys{\thefield{entrykey},}%
   \iffieldequals{namehash}{\cbx@lasthash}
     {}
     {\stepcounter{textcitetotal}%
      \savefield{namehash}{\cbx@lasthash}}}
  {}
  {\protected@xappto\cbx@savedcites{%
     [\thefield{prenote}][\thefield{postnote}]{\cbx@savedkeys}}}

% textcite has nested \DeclareCiteCommand definitions for textcite and we want to use
% the normal textcite context
\DeclareDelimcontextAlias{cbx@textcite}{textcite}

\newrobustcmd{\cbx@textcite@init}[2]{%
  \setcounter{textcitetotal}{0}%
  \setcounter{textcitecount}{0}%
  \def\cbx@savedcites{#1}#2%
  \ifnumgreater{\value{textcitetotal}}{0}
    {\cbx@savedcites}
    {}}

\DeclareMultiCiteCommand{\cbx@textcites}{\cbx@textcite}{}
\DeclareMultiCiteCommand{\textcites}[\cbx@textcites@init\cbx@textcites]{\textcite}{}

\let\cbx@textcites@init\cbx@textcite@init
\pretocmd{\cbx@textcites@init}{\UseNextMultiCiteHook}{}{}

\DeclareMultiCiteCommand{\cites}[\mkbibbrackets]{\cite}{\multicitedelim}
\DeclareMultiCiteCommand{\parencites}[\mkbibbrackets]{\parencite}{\multicitedelim}
\DeclareMultiCiteCommand{\smartcites}[\iffootnote\mkbibbrackets\mkbibfootnote]
  {\smartcite}{\multicitedelim}

\endinput