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\ProvidesFile{ext-authoryear-common.bbx}
  [2018/03/20 v0.1a common files for extended biblatex
   authoryear bibliography styles (MW)]

\RequireBibliographyStyle{ext-dashed-common}

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

% 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*{date}{%
    \iflabeldateisdate
      {}
      {\printdate}}%
  \renewbibmacro*{issue+date}{%
    \iflabeldateisdate
      {}
      {\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*{date}{%
    \iflabeldateisdate
      {}
      {\printdate}}%
  \renewbibmacro*{issue+date}{%
    \ifboolexpr{not test {\iffieldundef{issue}}
                or not test {\iflabeldateisdate}}
      {\printtext[issuedate]{%
         \printfield{issue}%
         \setunit*{\addspace}%
         \iflabeldateisdate
           {}
           {\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*{date}{%
    \ifboolexpr{
      test {\iflabeldateisdate}
      and
      not test {\ifdateshavedifferentprecision{label}{}}
    }
      {}
      {\printdate}}%
  \renewbibmacro*{issue+date}{%
    \ifboolexpr{
      test {\iflabeldateisdate}
      and
      not test {\ifdateshavedifferentprecision{label}{}}
      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*{date}{%
    \ifboolexpr{
      test {\iflabeldateisdate}
      and
      not test {\ifdateshavedifferentprecision{label}{}}
      and
      test {\iffieldundef{extradate}}
    }
      {}
      {\printdate}}%
  \renewbibmacro*{issue+date}{%
    \ifboolexpr{
      test {\iflabeldateisdate}
      and
      not test {\ifdateshavedifferentprecision{label}{}}
      and
      test {\iffieldundef{extradate}}
      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*{date}{\printdate}%
  \renewbibmacro*{issue+date}{%
    \printtext[issuedate]{%
      \printfield{issue}%
      \setunit*{\addspace}%
      \usebibmacro{date}}%
    \newunit}}

\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}
         \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