\ProvidesFile{gost-authoryear.bbx}
[2015/05/02\space v1.3\space biblatex-gost styles]

\RequireBibliographyStyle{gost-standard}

\DeclareBibliographyOption{mergedate}[true]{%
  \ifcsdef{bbx@opt@mergedate@#1}
    {\csuse{bbx@opt@mergedate@#1}}
    {\PackageError{biblatex}
       {Invalid option 'mergedate=#1'}
       {Valid values are 'maximum', 'compact', 'basic', 'minimum',\MessageBreak
        'goststrict', 'gostletter', 'gostlabel', 'true' (=compact), and 'false'.}}}

\providebibmacro*{date+extrayear}{}
\providebibmacro*{authoryearlabel}{}
\newbibmacro*{cite:date+extras}[1]{%
  \ifsingletitle
    {}
    {\iffieldundef{year}
      {}
      {\printtext[#1]{%
          \printdate%
          \usebibmacro{cite:extras}}}}}
\newbibmacro*{cite:extras}{%
  \ifnameundef{labelname}%    if there is labelname, extrayear disambiguation is enough
    {\printfield{extratitleyear}}
    {\printfield{extrayear}}}

\providebibmacro*{labeltitle}{}
\newlength{\labelauthoryearsep}

\def\bbx@opt@mergedate@true{\bbx@opt@mergedate@compact}

\def\bbx@opt@mergedate@maximum{%
  \renewbibmacro*{date+extrayear}{%
    \ifsingletitle
      {}
      {\iffieldundef{year}
        {}
        {\printtext[parens]{%
          \ifentrytype{article}
            {\printfield{issue}%
             \setunit*{\addspace}}
            {}%
      	 \usebibmacro{cite:date+extras}{}%
      	 \clearfield{month}%
      	 \clearfield{day}}}}}%
  %\renewcommand*{\labelnamepunct}{\newunitpunct}
  \renewbibmacro*{jour:volume+parts+issuetitle}{%
    \printfield{volume}%
    \setunit*{\addcomma\space}%
    \printfield{number}%
    \iffieldundef{issuetitle}
      {}
      {\setunit{\addcolon\space}%
       \printfield{issuetitle}}}%
  \renewbibmacro*{date}{\ifsingletitle{\printdate}{}}%
  \renewbibmacro*{year}{\ifsingletitle{\printfield{year}}{}}%
  \renewbibmacro*{jour:date}{%
    \ifsingletitle
      {\usebibmacro{year}%
       \newunit\newblock
       \mkbibdatelong{}{month}{day}}
      {}}%
  \renewbibmacro*{labeltitle}{%
    \iffieldundef{label}
       {\ifsingletitle
          {}
          {\iffieldundef{shorttitle}
            {\iffieldundef{maintitle}
              {\printfield{title}}
              {\printfield[title]{maintitle}}}%
             {\printfield[title]{shorttitle}}}}
       {\printfield{label}}}
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@compact{%
  \renewbibmacro*{date+extrayear}{%
    \usebibmacro{cite:date+extras}{parens}}%
  %\renewcommand*{\labelnamepunct}{\newunitpunct}
  \renewbibmacro*{date}{\ifsingletitle{\printdate}{}}%
  \renewbibmacro*{year}{\ifsingletitle{\printfield{year}}{}}%
  \renewbibmacro*{jour:date}{%
    \ifsingletitle
      {\usebibmacro{year}%
       \newunit\newblock
       \mkbibdatelong{}{month}{day}}
      {}}%
  \renewbibmacro*{labeltitle}{%
    \iffieldundef{label}
       {\ifsingletitle
          {}
          {\iffieldundef{shorttitle}
            {\iffieldundef{maintitle}
              {\printfield{title}}
              {\printfield[title]{maintitle}}}%
             {\printfield[title]{shorttitle}}}}
       {\printfield{label}}}
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@basic{%
  \renewbibmacro*{date+extrayear}{%
    \usebibmacro{cite:labelyear+extras}{parens}}%
  %\renewcommand*{\labelnamepunct}{\newunitpunct}
  \renewbibmacro*{date}{%
    \ifsingletitle
      {\printdate}
      {\iffieldundef{month}
        {}
        {\printdate}}}%
  \renewbibmacro*{year}{\printfield{year}}%
  \renewbibmacro*{labeltitle}{%
    \iffieldundef{label}
       {\ifsingletitle
          {}
          {\iffieldundef{shorttitle}
            {\iffieldundef{maintitle}
              {\printfield{title}}
              {\printfield[title]{maintitle}}}%
             {\printfield[title]{shorttitle}}}}
       {\printfield{label}}}
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@minimum{%
  \renewbibmacro*{date+extrayear}{%
    \usebibmacro{cite:labelyear+extras}{parens}}%
  %\renewcommand*{\labelnamepunct}{\newunitpunct}
  \renewbibmacro*{date}{%
    \ifsingletitle
      {\printdate}
      {\ifboolexpr{
          test {\iffieldundef{month}}
          and
          test {\iffieldundef{extrayear}}
        }
          {}
          {\printdate}}}%
  \renewbibmacro*{year}{\printfield{year}}%
  \renewbibmacro*{labeltitle}{%
    \iffieldundef{label}
       {\ifsingletitle
          {}
          {\iffieldundef{shorttitle}
            {\iffieldundef{maintitle}
              {\printfield{title}}
              {\printfield[title]{maintitle}}}%
             {\printfield[title]{shorttitle}}}}
       {\printfield{label}}}
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@false{%
  \renewbibmacro*{date+extrayear}{%
    \usebibmacro{cite:labelyear+extras}{parens}}%
  %\renewcommand*{\labelnamepunct}{\newunitpunct}
  \renewbibmacro*{date}{\printdate}%
  \renewbibmacro*{year}{\printfield{year}}%
  \renewbibmacro*{labeltitle}{%
    \iffieldundef{label}
       {\ifsingletitle
          {}
          {\iffieldundef{shorttitle}
            {\iffieldundef{maintitle}
              {\printfield{title}}
              {\printfield[title]{maintitle}}}%
             {\printfield[title]{shorttitle}}}}
       {\printfield{label}}}
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@goststrict{%
  \renewbibmacro*{date+extrayear}{}%
  \renewbibmacro*{date}{\printdate}%
  \renewbibmacro*{year}{\printfield{year}}%
  \renewbibmacro*{labeltitle}{}%
  \DeclareFieldFormat{extrayear}{%
    \PackageWarning{biblatex-gost}{%
      Citation \thefield{entrykey} is not unique}}%
  \DeclareFieldFormat{extratitleyear}{%
    \PackageWarning{biblatex-gost}{%
      Citation \thefield{entrykey} is not unique}}%
  \ExecuteBibliographyOptions{singletitle}%
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@gostletter{%
  \renewbibmacro*{date+extrayear}{}%
  \renewbibmacro*{date}{\printdate\usebibmacro{cite:extras}}%
  \renewbibmacro*{year}{\printfield{year}\usebibmacro{cite:extras}}%
  \renewbibmacro*{labeltitle}{}%
  \renewbibmacro*{authoryearlabel}{}%
  \setlength{\labelauthoryearsep}{0pt}%
}

\def\bbx@opt@mergedate@gostlabel{%
  \renewbibmacro*{date+extrayear}{}%
  \renewbibmacro*{date}{\printdate}%
  \renewbibmacro*{year}{\printfield{year}}%
  \renewbibmacro*{labeltitle}{}%
  \renewbibmacro*{heading}{}%
  \renewbibmacro*{authoryearlabel}{%
    \mkbibbrackets{%
      \iffieldundef{heading}
       {\iffieldundef{shorthand}
          {\ifthenelse{\ifnameundef{labelname}\OR\iffieldundef{labelyear}}
              {\ifnameundef{labelname}
                {\usebibmacro{cite:label+volume+parts}{}%
                 \setunit{\nameyeardelim}%
                 \usebibmacro{cite:labelyear+extras}{}}
                {\usebibmacro{cite:labelname+volume+parts}{}}}
              {\usebibmacro{cite:labelname+volume+parts}{}%
                \setunit{\nameyeardelim}%
                \usebibmacro{cite:labelyear+extras}{}}}
          {\printfield{shorthand}}}
        {\usebibmacro{cite:heading}{}}}}%
  \setlength{\biblabelsep}{.5em}%
  \setlength{\labelauthoryearsep}{\biblabelsep}%
}

\ExecuteBibliographyOptions{labeldate,labeltitleyear,sorting=nyt,pagetracker,mergedate=gostletter,
                            bibisbn,biburl,bibdoi,bibeprint}

\DeclareFieldFormat{shorthandwidth}{#1}
\setlength{\bibitemsep}{0pt}

\defbibenvironment{bibliography}
  {\list
     {\usebibmacro{authoryearlabel}}
     {\setlength{\leftmargin}{\bibhang}%
      \setlength{\labelwidth}{0pt}
      \setlength{\labelsep}{\labelauthoryearsep}%
      \setlength{\itemindent}{-\leftmargin}
      \addtolength{\itemindent}{\labelsep}
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}}}
  {\endlist}
  {\item}

\defbibenvironment{shorthands}
  {\list
     {\printfield[shorthandwidth]{shorthand}}
     {\setlength{\labelwidth}{\shorthandwidth}%
      \setlength{\leftmargin}{\labelwidth}%
      \setlength{\labelsep}{\biblabelsep}%
      \addtolength{\leftmargin}{\labelsep}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}%
      \renewcommand*{\makelabel}[1]{##1\hss}}}
  {\endlist}
  {\item}

\renewbibmacro*{author}{%
  \ifboolexpr{
    test \ifuseauthor
    and
    not test {\ifnameundef{author}}
  }
    {\usebibmacro{bbx:dashcheck}
       {\bibnamedash}
       {\printnames{author}%
     \setunit{\addcomma\space}%
     \usebibmacro{bbx:savehash}}%
     \usebibmacro{authorstrg}%
     \setunit*{\addspace}}
    {\global\undef\bbx@lasthash%
     \usebibmacro{labeltitle}%
     \setunit*{\addspace}}%
  \usebibmacro{date+extrayear}}


\renewbibmacro*{editor}{%
  \usebibmacro{bbx:editor}{editorstrg}}
\renewbibmacro*{editor+others}{%
  \usebibmacro{bbx:editor}{editor+othersstrg}}
\renewbibmacro*{bbx:editor}[1]{%
  \ifboolexpr{
    test \ifuseeditor
    and
    not test {\ifnameundef{editor}}
  }
    {\usebibmacro{bbx:dashcheck}
       {\bibnamedash}
       {\printnames{editor}%
     \setunit{\addcomma\space}%
     \usebibmacro{bbx:savehash}}%
     \usebibmacro{#1}%
     \clearname{editor}%
     \setunit*{\addspace}}%
    {\global\undef\bbx@lasthash%
     \usebibmacro{labeltitle}%
     \setunit*{\addspace}}%
  \usebibmacro{date+extrayear}}

\renewbibmacro*{translator}{%
  \usebibmacro{bbx:translator}{translatorstrg}}
\renewbibmacro*{translator+others}{%
  \usebibmacro{bbx:translator}{translator+othersstrg}}
\renewbibmacro*{bbx:translator}[1]{%
  \ifboolexpr{
    test \ifusetranslator
    and
    not test {\ifnameundef{translator}}
  }
    {\usebibmacro{bbx:dashcheck}
       {\bibnamedash}
       {\printnames{translator}%
     \setunit{\addcomma\space}%
     \usebibmacro{bbx:savehash}}%
     \usebibmacro{#1}%
     \clearname{translator}%
     \setunit*{\addspace}}%
    {\global\undef\bbx@lasthash%
     \usebibmacro{labeltitle}%
     \setunit*{\addspace}}%
  \usebibmacro{date+extrayear}}


\endinput