\ProvidesFile{thuthesis-author-year.bbx}[2020/08/01 v1.0 ThuThesis biblatex
  bibliography style]

\RequireBibliographyStyle{gb7714-2015ay}

\ExecuteBibliographyOptions{
  gbnamefmt = lowercase,
  gbpub     = false,
}

\defbibenvironment{bibliography}
  {\list
     {}
     {\setlength{\leftmargin}{\bibhang}%
      \setlength{\itemindent}{-\leftmargin}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}}}
  {\endlist}
  {\item}

%
%   重设专利title的输出，将文献类型标识符输出出去
%
\renewbibmacro*{patenttitle}{%原输出来自biblatex.def文件
  \ifboolexpr{%
    test{\iffieldundef{title}}%
    and%
    test{\iffieldundef{subtitle}}%
  }%
    {}%
    {\printtext[title]{\bibtitlefont%
       \printfield[titlecase]{title}%
       \ifboolexpr{test {\iffieldundef{subtitle}}}
       {}{\setunit{\subtitlepunct}%
       \printfield[titlecase]{subtitle}}%
       \iffieldundef{titleaddon}{}
        {\setunit{\subtitlepunct}\printfield{titleaddon}}%
       % \setunit{\subtitlepunct}\printfield{number}%写专利号
       \setunit{\subtitlepunct}%
       \iflistundef{location}{}
        {\printlist{location}\setunit{\addcomma\space}}% 专利国别
       \printfield{number}%写专利号
       \iftoggle{bbx:gbtype}{\printfield[gbtypeflag]{usera}}{}%
     %\iffieldundef{booktitle}{\newunit}{}%当title是析出时，不要标点
     %\newunit
     }%
}%
\clearlist{location}\clearlist{address}%
}