\ProvidesFile{ext-authoryear-common.bbx}
  [2025/06/24 v0.20 common files for extended biblatex
   authoryear bibliography styles (MW)]

\RequireBibliographyStyle{ext-dashed-common}

\DeclareFieldFormat{biblabeldate}{\mkbibparens{#1}}
\DeclareFieldAlias{biblistlabeldate}{biblabeldate}

\providebibmacro*{bbx:ifmergeddate}{\@secondoftwo}

\renewbibmacro*{date}{%
  \usebibmacro{bbx:ifmergeddate}
    {}
    {\printdate}}

% merge date/issue with date label
\def\bbx@opt@mergedate@maximum{%
  \renewbibmacro*{date+extradate}{%
    \iffieldundef{labelyear}
      {}
      {\printtext[\blx@delimcontext labeldate]{%
         \iflabeldateisdate
           {\printfield{issue}%
            \setunit*{\addspace}%
            \printdateextra}
           {\printlabeldateextra}}}}%
  \renewbibmacro*{bbx:ifmergeddate}{\iflabeldateisdate}%
  \renewbibmacro*{issue+date}{%
    \usebibmacro{bbx:ifmergeddate}
      {}
      {\printtext[issuedate]{%
         \printfield{issue}%
         \setunit*{\addspace}%
         \printdate}}}}

% merge date with date label
\def\bbx@opt@mergedate@compact{%
  \renewbibmacro*{date+extradate}{%
    \iffieldundef{labelyear}
      {}
      {\printtext[\blx@delimcontext labeldate]{%
         \iflabeldateisdate
           {\printdateextra}
           {\printlabeldateextra}}}}%
  \renewbibmacro*{bbx:ifmergeddate}{\iflabeldateisdate}%
  \renewbibmacro*{issue+date}{%
    \ifboolexpr{test {\usebibmacro{bbx:ifmergeddate}}
                and
                test {\iffieldundef{issue}}}
      {}
      {\printtext[issuedate]{%
         \printfield{issue}%
         \setunit*{\addspace}%
         \usebibmacro{bbx:ifmergeddate}
           {}
           {\printdate}}}%
    \newunit}}

% merge year-only date with date label
\def\bbx@opt@mergedate@basic{%
  \renewbibmacro*{date+extradate}{%
    \iffieldundef{labelyear}
      {}
      {\printtext[\blx@delimcontext labeldate]{\printlabeldateextra}}}%
  \renewbibmacro*{bbx:ifmergeddate}{%
    \ifboolexpr{
      test {\iflabeldateisdate}
      and
      not test {\ifdateshavedifferentprecision{label}{}}
    }%
  }%
  \renewbibmacro*{issue+date}{%
    \ifboolexpr{
      test {\usebibmacro{bbx:ifmergeddate}}
      and
      test {\iffieldundef{issue}}
    }
      {}
      {\printtext[issuedate]{%
         \printfield{issue}%
         \setunit*{\addspace}%
         \printdate}}%
    \newunit}}

% merge year-only date with year-only date label
\def\bbx@opt@mergedate@minimum{%
  \renewbibmacro*{date+extradate}{%
    \iffieldundef{labelyear}
      {}
      {\printtext[\blx@delimcontext labeldate]{\printlabeldateextra}}}%
  \renewbibmacro*{bbx:ifmergeddate}{%
    \ifboolexpr{
      test {\iflabeldateisdate}
      and
      not test {\ifdateshavedifferentprecision{label}{}}
      and
      test {\iffieldundef{extradate}}
    }%
  }%
  \renewbibmacro*{issue+date}{%
    \ifboolexpr{
      test {\usebibmacro{bbx:ifmergeddate}}
      and
      test {\iffieldundef{issue}}
    }
      {}
      {\printtext[issuedate]{%
         \printfield{issue}%
         \setunit*{\addspace}%
         \printdate}}%
    \newunit}}

% don't merge date/issue with date label
\def\bbx@opt@mergedate@false{%
  \renewbibmacro*{date+extradate}{%
    \iffieldundef{labelyear}
      {}
      {\printtext[\blx@delimcontext labeldate]{\printlabeldateextra}}}%
  \renewbibmacro*{bbx:ifmergeddate}{\@secondoftwo}%
  \renewbibmacro*{issue+date}{%
    \printtext[issuedate]{%
      \printfield{issue}%
      \setunit*{\addspace}%
      \usebibmacro{date}}%
    \newunit}}

\DeclareFieldFormat{biblabeltitle}{\mkbibemph{#1}}
\DeclareFieldFormat
  [article,inbook,incollection,inproceedings,patent,thesis,unpublished]
  {biblabeltitle}{\mkbibquote{#1\isdot}}
\DeclareFieldFormat
  [suppbook,suppcollection,suppperiodical]
  {biblabeltitle}{#1}

\DeclareFieldAlias{titlecase:biblabeltitle}{tilecase}

\renewbibmacro*{labeltitle}{%
  \iffieldundef{label}
    {\iffieldundef{shorttitle}
       {\iffieldundef{title}
          {\printtext[biblabeltitle]{%
             \printfield[titlecase:biblabeltitle]{maintitle}}%
           \clearfield{maintitle}}
          {\printtext[biblabeltitle]{%
             \printfield[titlecase:biblabeltitle]{title}}%
           \clearfield{title}}}
       {\printtext[biblabeltitle]{%
          \printfield[titlecase:biblabeltitle]{shorttitle}}}}
    {\printfield{label}}}

\defbibenvironment{bibliography}
  {\list
     {\ifcsequal{extblx@introcite}{extblx@opt@introcite@label}
        {\usebibmacro{introcite:typeset}}
        {}}
     {\ifcsequal{extblx@introcite}{extblx@opt@introcite@label}
        {\setlength{\labelwidth}{\introcitewidth}%
         \setlength{\leftmargin}{\labelwidth}%
         \setlength{\labelsep}{\introcitesep}%
         \addtolength{\leftmargin}{\labelsep}%
         \renewcommand*{\makelabel}[1]{##1\hss}}
        {\setlength{\leftmargin}{\bibhang}%
         \setlength{\itemindent}{-\leftmargin}}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}}}
  {\endlist}
  {\item
   \ifcsequal{extblx@introcite}{extblx@opt@introcite@label}
     {\usebibmacro{introcite:break}}
     {}}

% We need to execute some options that were already executed
% by the standard styles again, because we changed the
% underlying definitions.
\ExecuteBibliographyOptions{mergedate=compact, dashed=true}%

\endinput
%
% This file is part of the biblatex-ext bundle.
% biblatex-ext is released under the LaTeX Project Public License v1.3c
% or later.
%
% A complete list of files included in that package can be found in
% README.md or - failing that - in ext-standard.bbx.
%
% Official releases of this package are on CTAN
%   https://www.ctan.org/pkg/biblatex-ext
% development takes place on GitHub
%   https://github.com/moewew/biblatex-ext
%