ustcthesis-authoryear.bst

%%
%% This is file `variants/ustc/ustcthesis-authoryear.bst',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% gbt7714.dtx  (with options: `2015,ustc,author-year')
%% -------------------------------------------------------------------
%% GB/T 7714—2015 BibTeX Style
%% https://github.com/zepinglee/gbt7714-bibtex-style
%% Version: 2021/12/08 v2.1.3
%% -------------------------------------------------------------------
%% Copyright (C) 2016—2021 by Zeping Lee <zepinglee AT gmail.com>
%% -------------------------------------------------------------------
%% This file may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%%    https://www.latex-project.org/lppl.txt
%% and version 1.3c or later is part of all distributions of LaTeX
%% version 2008 or later.
%% -------------------------------------------------------------------
INTEGERS {
  citation.et.al.min
  citation.et.al.use.first
  bibliography.et.al.min
  bibliography.et.al.use.first
  uppercase.name
  terms.in.macro
  year.after.author
  period.after.author
  italic.book.title
  sentence.case.title
  link.title
  title.in.journal
  show.patent.country
  show.mark
  space.before.mark
  show.medium.type
  slash.for.extraction
  in.booktitle
  short.journal
  italic.journal
  bold.journal.volume
  show.missing.address.publisher
  space.before.pages
  only.start.page
  wave.dash.in.pages
  show.urldate
  show.url
  show.doi
  show.preprint
  show.note
  show.english.translation
  end.with.period
  lang.zh.order
  lang.ja.order
  lang.en.order
  lang.ru.order
  lang.other.order
}

FUNCTION {load.config}
{
  #2 'citation.et.al.min :=
  #1 'citation.et.al.use.first :=
  #4 'bibliography.et.al.min :=
  #3 'bibliography.et.al.use.first :=
  #1 'uppercase.name :=
  #0 'terms.in.macro :=
  #1 'year.after.author :=
  #1 'period.after.author :=
  #0 'italic.book.title :=
  #1 'sentence.case.title :=
  #0 'link.title :=
  #1 'title.in.journal :=
  #1 'show.patent.country :=
  #1 'show.mark :=
  #0 'space.before.mark :=
  #1 'show.medium.type :=
  #1 'slash.for.extraction :=
  #0 'in.booktitle :=
  #0 'short.journal :=
  #0 'italic.journal :=
  #0 'bold.journal.volume :=
  #0 'show.missing.address.publisher :=
  #1 'space.before.pages :=
  #0 'only.start.page :=
  #0 'wave.dash.in.pages :=
  #1 'show.urldate :=
  #1 'show.url :=
  #1 'show.doi :=
  #1 'show.preprint :=
  #0 'show.note :=
  #0 'show.english.translation :=
  #1 'end.with.period :=
  #1 'lang.zh.order :=
  #2 'lang.ja.order :=
  #3 'lang.en.order :=
  #4 'lang.ru.order :=
  #5 'lang.other.order :=
}

ENTRY
  { address
    archivePrefix
    author
    booktitle
    date
    doi
    edition
    editor
    eprint
    eprinttype
    howpublished
    institution
    journal
    journaltitle
    key
    langid
    language
    location
    mark
    medium
    note
    number
    organization
    pages
    publisher
    school
    series
    shortjournal
    title
    translation
    translator
    url
    urldate
    volume
    year
  }
  { entry.lang entry.is.electronic is.pure.electronic entry.numbered }
  { label extra.label sort.label short.label short.list entry.mark entry.url }

INTEGERS { output.state before.all mid.sentence after.sentence after.block after.slash }

INTEGERS { lang.zh lang.ja lang.en lang.ru lang.other }

INTEGERS { charptr len }

FUNCTION {init.state.consts}
{ #0 'before.all :=
  #1 'mid.sentence :=
  #2 'after.sentence :=
  #3 'after.block :=
  #4 'after.slash :=
  #3 'lang.zh :=
  #4 'lang.ja :=
  #1 'lang.en :=
  #2 'lang.ru :=
  #0 'lang.other :=
}

FUNCTION {bbl.anonymous}
{ entry.lang lang.zh =
    { "佚名" }
    { "Anon" }
  if$
}

FUNCTION {bbl.space}
{ entry.lang lang.zh =
    { "\ " }
    { " " }
  if$
}

FUNCTION {bbl.and}
{ "" }

FUNCTION {bbl.et.al}
{ entry.lang lang.zh =
    { "等" }
    { entry.lang lang.ja =
        { "他" }
        { entry.lang lang.ru =
            { "идр" }
            { "et~al." }
          if$
        }
      if$
    }
  if$
}

FUNCTION {citation.and}
{ terms.in.macro
    { "{\biband}" }
    'bbl.and
  if$
}

FUNCTION {citation.et.al}
{ terms.in.macro
    { "{\bibetal}" }
    'bbl.et.al
  if$
}

FUNCTION {bbl.colon} { ": " }

FUNCTION {bbl.pages.colon}
{ space.before.pages
    { ": " }
    { ":\allowbreak " }
  if$
}

FUNCTION {bbl.wide.space} { "\quad " }

FUNCTION {bbl.slash} { "//\allowbreak " }

FUNCTION {bbl.sine.loco}
{ entry.lang lang.zh =
    { "[出版地不详]" }
    { "[S.l.]" }
  if$
}

FUNCTION {bbl.sine.nomine}
{ entry.lang lang.zh =
    { "[出版者不详]" }
    { "[s.n.]" }
  if$
}

FUNCTION {bbl.sine.loco.sine.nomine}
{ entry.lang lang.zh =
    { "[出版地不详: 出版者不详]" }
    { "[S.l.: s.n.]" }
  if$
}

FUNCTION {not}
{   { #0 }
    { #1 }
  if$
}

FUNCTION {and}
{   'skip$
    { pop$ #0 }
  if$
}

FUNCTION {or}
{   { pop$ #1 }
    'skip$
  if$
}

STRINGS { x y }

FUNCTION {contains}
{ 'y :=
  'x :=
  y text.length$ 'len :=
  x text.length$ len - #1 + 'charptr :=
    { charptr #0 >
      x charptr len substring$ y = not
      and
    }
    { charptr #1 - 'charptr := }
  while$
  charptr #0 >
}

STRINGS { s t }

FUNCTION {output.nonnull}
{ 's :=
  output.state mid.sentence =
    { ", " * write$ }
    { output.state after.block =
        { add.period$ write$
          newline$
          "\newblock " write$
        }
        { output.state before.all =
            'write$
            { output.state after.slash =
                { bbl.slash * write$
                  newline$
                }
                { add.period$ " " * write$ }
              if$
            }
          if$
        }
      if$
      mid.sentence 'output.state :=
    }
  if$
  s
}

FUNCTION {output}
{ duplicate$ empty$
    'pop$
    'output.nonnull
  if$
}

FUNCTION {output.after}
{ 't :=
  duplicate$ empty$
    'pop$
    { 's :=
      output.state mid.sentence =
        { t * write$ }
        { output.state after.block =
            { add.period$ write$
              newline$
              "\newblock " write$
            }
            { output.state before.all =
                'write$
                { output.state after.slash =
                    { bbl.slash * write$ }
                    { add.period$ " " * write$ }
                  if$
                }
              if$
            }
          if$
          mid.sentence 'output.state :=
        }
      if$
      s
    }
  if$
}

FUNCTION {output.check}
{ 't :=
  duplicate$ empty$
    { pop$ "empty " t * " in " * cite$ * warning$ }
    'output.nonnull
  if$
}

FUNCTION {fin.entry}
{ end.with.period
    'add.period$
    'skip$
  if$
  write$
  show.english.translation entry.lang lang.zh = and
    { ")"
      write$
    }
    'skip$
  if$
  newline$
}

FUNCTION {new.block}
{ output.state before.all =
    'skip$
    { output.state after.slash =
        'skip$
        { after.block 'output.state := }
      if$
    }
  if$
}

FUNCTION {new.sentence}
{ output.state after.block =
    'skip$
    { output.state before.all =
        'skip$
        { output.state after.slash =
            'skip$
            { after.sentence 'output.state := }
          if$
        }
      if$
    }
  if$
}

FUNCTION {new.slash}
{ output.state before.all =
    'skip$
    { slash.for.extraction
        { after.slash 'output.state := }
        { after.block 'output.state := }
      if$
    }
  if$
}

FUNCTION {new.block.checka}
{ empty$
    'skip$
    'new.block
  if$
}

FUNCTION {new.block.checkb}
{ empty$
  swap$ empty$
  and
    'skip$
    'new.block
  if$
}

FUNCTION {new.sentence.checka}
{ empty$
    'skip$
    'new.sentence
  if$
}

FUNCTION {new.sentence.checkb}
{ empty$
  swap$ empty$
  and
    'skip$
    'new.sentence
  if$
}

FUNCTION {field.or.null}
{ duplicate$ empty$
    { pop$ "" }
    'skip$
  if$
}

FUNCTION {emphasize}
{ duplicate$ empty$
    { pop$ "" }
    { "\emph{" swap$ * "}" * }
  if$
}

FUNCTION {format.btitle}
{ italic.book.title
  entry.lang lang.en = and
    'emphasize
    'skip$
  if$
}

INTEGERS { byte second.byte }

INTEGERS { char.lang tmp.lang }

STRINGS { tmp.str }

FUNCTION {get.str.lang}
{ 'tmp.str :=
  lang.other 'tmp.lang :=
  #1 'charptr :=
  tmp.str text.length$ #1 + 'len :=
    { charptr len < }
    { tmp.str charptr #1 substring$ chr.to.int$ 'byte :=
      byte #128 <
        { charptr #1 + 'charptr :=
          byte #64 > byte #91 < and byte #96 > byte #123 < and or
            { lang.en 'char.lang := }
            { lang.other 'char.lang := }
          if$
        }
        { tmp.str charptr #1 + #1 substring$ chr.to.int$ 'second.byte :=
          byte #224 <
            { charptr #2 + 'charptr :=
              byte #207 > byte #212 < and
              byte #212 = second.byte #176 < and or
                { lang.ru 'char.lang := }
                { lang.other 'char.lang := }
              if$
            }
            { byte #240 <
                { charptr #3 + 'charptr :=
                  byte #227 > byte #234 < and
                    { lang.zh 'char.lang := }
                    { byte #227 =
                        { second.byte #143 >
                            { lang.zh 'char.lang := }
                            { second.byte #128 > second.byte #132 < and
                                { lang.ja 'char.lang := }
                                { lang.other 'char.lang := }
                              if$
                            }
                          if$
                        }
                        { byte #239 =
                          second.byte #163 > second.byte #172 < and and
                            { lang.zh 'char.lang := }
                            { lang.other 'char.lang := }
                          if$
                        }
                      if$
                    }
                  if$
                }
                { charptr #4 + 'charptr :=
                  byte #240 = second.byte #159 > and
                    { lang.zh 'char.lang := }
                    { lang.other 'char.lang := }
                  if$
                }
              if$
            }
          if$
        }
      if$
      char.lang tmp.lang >
        { char.lang 'tmp.lang := }
        'skip$
      if$
    }
  while$
  tmp.lang
}

FUNCTION {check.entry.lang}
{ author field.or.null
  title field.or.null *
  get.str.lang
}

STRINGS { entry.langid }

FUNCTION {set.entry.lang}
{ "" 'entry.langid :=
  language empty$ not
    { language 'entry.langid := }
    'skip$
  if$
  langid empty$ not
    { langid 'entry.langid := }
    'skip$
  if$
  entry.langid empty$
    { check.entry.lang }
    { entry.langid "english" = entry.langid "american" = or entry.langid "british" = or
        { lang.en }
        { entry.langid "chinese" =
            { lang.zh }
            { entry.langid "japanese" =
                { lang.ja }
                { entry.langid "russian" =
                    { lang.ru }
                    { check.entry.lang }
                  if$
                }
              if$
            }
          if$
        }
      if$
    }
  if$
  'entry.lang :=
}

FUNCTION {set.entry.numbered}
{ type$ "patent" =
  type$ "standard" = or
  type$ "techreport" = or
    { #1 'entry.numbered := }
    { #0 'entry.numbered := }
  if$
}

INTEGERS { nameptr namesleft numnames name.lang }

FUNCTION {format.name}
{ "{vv~}{ll}{, jj}{, ff}" format.name$ 't :=
  t "others" =
    { bbl.et.al }
    { t get.str.lang 'name.lang :=
      name.lang lang.en =
        { t #1 "{vv~}{ll}{ f{~}}" format.name$
          uppercase.name
            { "u" change.case$ }
            'skip$
          if$
          t #1 "{, jj}" format.name$ *
        }
        { t #1 "{ll}{ff}" format.name$ }
      if$
    }
  if$
}

FUNCTION {format.names}
{ 's :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  ""
  numnames 'namesleft :=
    { namesleft #0 > }
    { s nameptr format.name bbl.et.al =
      numnames bibliography.et.al.min #1 - > nameptr bibliography.et.al.use.first > and or
        { ", " *
          bbl.et.al *
          #1 'namesleft :=
        }
        { nameptr #1 >
            { namesleft #1 = bbl.and "" = not and
                { bbl.and * }
                { ", " * }
              if$
            }
            'skip$
          if$
          s nameptr format.name *
        }
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {format.key}
{ empty$
    { key field.or.null }
    { "" }
  if$
}

FUNCTION {format.authors}
{ author empty$ not
    { author format.names }
    { "empty author in " cite$ * warning$
      bbl.anonymous
    }
  if$
}

FUNCTION {format.editors}
{ editor empty$
    { "" }
    { editor format.names }
  if$
}

FUNCTION {format.translators}
{ translator empty$
    { "" }
    { translator format.names
      entry.lang lang.zh =
        { translator num.names$ #3 >
            { "译" * }
            { ", 译" * }
          if$
        }
        'skip$
      if$
    }
  if$
}

FUNCTION {format.full.names}
{'s :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    { s nameptr "{vv~}{ll}{, jj}{, ff}" format.name$ 't :=
      t get.str.lang 'name.lang :=
      name.lang lang.en =
        { t #1 "{vv~}{ll}" format.name$ 't := }
        { t #1 "{ll}{ff}" format.name$ 't := }
      if$
      nameptr #1 >
        {
          namesleft #1 >
            { ", " * t * }
            {
              numnames #2 >
                { "," * }
                'skip$
              if$
              t "others" =
                { " et~al." * }
                { " and " * t * }
              if$
            }
          if$
        }
        't
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {author.editor.full}
{ author empty$
    { editor empty$
        { "" }
        { editor format.full.names }
      if$
    }
    { author format.full.names }
  if$
}

FUNCTION {author.full}
{ author empty$
    { "" }
    { author format.full.names }
  if$
}

FUNCTION {editor.full}
{ editor empty$
    { "" }
    { editor format.full.names }
  if$
}

FUNCTION {make.full.names}
{ type$ "book" =
  type$ "inbook" =
  or
    'author.editor.full
    { type$ "collection" =
      type$ "proceedings" =
      or
        'editor.full
        'author.full
      if$
    }
  if$
}

FUNCTION {output.bibitem}
{ newline$
  "\bibitem[" write$
  label ")" *
  make.full.names duplicate$ short.list =
    { pop$ }
    { duplicate$ "]" contains
        { "{" swap$ * "}" * }
        'skip$
      if$
      *
    }
  if$
  "]{" * write$
  cite$ write$
  "}" write$
  newline$
  ""
  before.all 'output.state :=
}

FUNCTION {change.sentence.case}
{ entry.lang lang.en =
    { "t" change.case$ }
    'skip$
  if$
}

FUNCTION {add.link}
{ url empty$ not
    { "\href{" url * "}{" * swap$ * "}" * }
    { doi empty$ not
        { "\href{https://doi.org/" doi * "}{" * swap$ * "}" * }
        'skip$
      if$
    }
  if$
}

FUNCTION {format.title}
{ title empty$
    { "" }
    { title
      sentence.case.title
        'change.sentence.case
        'skip$
      if$
      entry.numbered number empty$ not and
        { bbl.colon *
          type$ "patent" = show.patent.country and
            { address empty$ not
                { address * ", " * }
                { location empty$ not
                    { location * ", " * }
                    { entry.lang lang.zh =
                        { "中国" * ", " * }
                        'skip$
                      if$
                    }
                  if$
                }
              if$
            }
            'skip$
          if$
          number *
        }
        'skip$
      if$
      link.title
        'add.link
        'skip$
      if$
    }
  if$
}

FUNCTION {tie.or.space.connect}
{ duplicate$ text.length$ #3 <
    { "~" }
    { " " }
  if$
  swap$ * *
}

FUNCTION {either.or.check}
{ empty$
    'pop$
    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
  if$
}

FUNCTION {is.digit}
{ duplicate$ empty$
    { pop$ #0 }
    { chr.to.int$
      duplicate$ "0" chr.to.int$ <
      { pop$ #0 }
      { "9" chr.to.int$ >
          { #0 }
          { #1 }
        if$
      }
    if$
    }
  if$
}

FUNCTION {is.number}
{ 's :=
  s empty$
    { #0 }
    { s text.length$ 'charptr :=
        { charptr #0 >
          s charptr #1 substring$ is.digit
          and
        }
        { charptr #1 - 'charptr := }
      while$
      charptr not
    }
  if$
}

FUNCTION {format.volume}
{ volume empty$ not
    { volume is.number
        { entry.lang lang.zh =
            { "第 " volume * " 卷" * }
            { "volume" volume tie.or.space.connect }
          if$
        }
        { volume }
      if$
    }
    { "" }
  if$
}

FUNCTION {format.number}
{ number empty$ not
    { number is.number
        { entry.lang lang.zh =
            { "第 " number * " 册" * }
            { "number" number tie.or.space.connect }
          if$
        }
        { number }
      if$
    }
    { "" }
  if$
}

FUNCTION {format.volume.number}
{ volume empty$ not
    { format.volume }
    { format.number }
  if$
}

FUNCTION {format.title.vol.num}
{ title
  sentence.case.title
    'change.sentence.case
    'skip$
  if$
  entry.numbered
    { number empty$ not
        { bbl.colon * number * }
        'skip$
      if$
    }
    { format.volume.number 's :=
      s empty$ not
        { bbl.colon * s * }
        'skip$
      if$
    }
  if$
}

FUNCTION {format.series.vol.num.title}
{ format.volume.number 's :=
  series empty$ not
    { series
      sentence.case.title
        'change.sentence.case
        'skip$
      if$
      entry.numbered
        { bbl.wide.space * }
        { bbl.colon *
          s empty$ not
            { s * bbl.wide.space * }
            'skip$
          if$
        }
      if$
      title *
      sentence.case.title
        'change.sentence.case
        'skip$
      if$
      entry.numbered number empty$ not and
        { bbl.colon * number * }
        'skip$
      if$
    }
    { format.title.vol.num }
  if$
  format.btitle
  link.title
    'add.link
    'skip$
  if$
}

FUNCTION {format.booktitle.vol.num}
{ booktitle
  entry.numbered
    'skip$
    { format.volume.number 's :=
      s empty$ not
        { bbl.colon * s * }
        'skip$
      if$
    }
  if$
}

FUNCTION {format.series.vol.num.booktitle}
{ format.volume.number 's :=
  series empty$ not
    { series bbl.colon *
      entry.numbered not s empty$ not and
        { s * bbl.wide.space * }
        'skip$
      if$
      booktitle *
    }
    { format.booktitle.vol.num }
  if$
  format.btitle
  in.booktitle
    { duplicate$ empty$ not entry.lang lang.en = and
        { "In: " swap$ * }
        'skip$
      if$
    }
    'skip$
  if$
}

FUNCTION {remove.period}
{ 't :=
  "" 's :=
    { t empty$ not }
    { t #1 #1 substring$ 'tmp.str :=
      tmp.str "." = not
        { s tmp.str * 's := }
        'skip$
      if$
      t #2 global.max$ substring$ 't :=
    }
  while$
  s
}

FUNCTION {abbreviate}
{ remove.period
  't :=
  t "l" change.case$ 's :=
  ""
  s "physical review letters" =
    { "Phys Rev Lett" }
    'skip$
  if$
  's :=
  s empty$
    { t }
    { pop$ s }
  if$
}

FUNCTION {get.journal.title}
{ short.journal
    { shortjournal empty$ not
        { shortjournal }
        { journal empty$ not
            { journal abbreviate }
            { journaltitle empty$ not
                { journaltitle abbreviate }
                { "" }
              if$
            }
          if$
        }
      if$
    }
    { journal empty$ not
        { journal }
        { journaltitle empty$ not
            { journaltitle }
            { shortjournal empty$ not
                { shortjournal }
                { "" }
              if$
            }
          if$
        }
      if$
    }
  if$
}

FUNCTION {check.arxiv.preprint}
{ #1 #5 substring$ "l" change.case$ "arxiv" =
    { #1 }
    { #0 }
  if$
}

FUNCTION {format.journal}
{ get.journal.title
  duplicate$ empty$ not
    { italic.journal entry.lang lang.en = and
        'emphasize
        'skip$
      if$
    }
    'skip$
  if$
}

FUNCTION {set.entry.mark}
{ entry.mark empty$ not
    'pop$
    { mark empty$ not
        { pop$ mark 'entry.mark := }
        { 'entry.mark := }
      if$
    }
  if$
}

FUNCTION {format.mark}
{ show.mark
    { entry.mark
      show.medium.type
        { medium empty$ not
            { "/" * medium * }
            { entry.is.electronic
                { "/OL" * }
                'skip$
              if$
            }
          if$
        }
        'skip$
      if$
      'entry.mark :=
      space.before.mark
        { " " }
        { "\allowbreak" }
      if$
      "[" * entry.mark * "]" *
    }
    { "" }
  if$
}

FUNCTION {num.to.ordinal}
{ duplicate$ text.length$ 'charptr :=
  duplicate$ charptr #1 substring$ 's :=
  s "1" =
    { "st" * }
    { s "2" =
        { "nd" * }
        { s "3" =
            { "rd" * }
            { "th" * }
          if$
        }
      if$
    }
  if$
}

FUNCTION {format.edition}
{ edition empty$
    { "" }
    { edition is.number
        { entry.lang lang.zh =
            { edition " 版" * }
            { edition num.to.ordinal " ed." * }
          if$
        }
        { entry.lang lang.en =
            { edition change.sentence.case 's :=
              s "Revised" = s "Revised edition" = or
                { "Rev. ed." }
                { s " ed." * }
              if$
            }
            { edition }
          if$
        }
      if$
    }
  if$
}

FUNCTION {format.publisher}
{ publisher empty$ not
    { publisher }
    { school empty$ not
        { school }
        { organization empty$ not
            { organization }
            { institution empty$ not
                { institution }
                { "" }
              if$
            }
          if$
        }
      if$
    }
  if$
}

FUNCTION {format.address.publisher}
{ address empty$ not
    { address }
    { location empty$ not
        { location }
        { "" }
      if$
    }
  if$
  duplicate$ empty$ not
    { format.publisher empty$ not
        { bbl.colon * format.publisher * }
        { entry.is.electronic not show.missing.address.publisher and
            { bbl.colon * bbl.sine.nomine * }
            'skip$
          if$
        }
      if$
    }
    { pop$
      entry.is.electronic not show.missing.address.publisher and
        { format.publisher empty$ not
            { bbl.sine.loco bbl.colon * format.publisher * }
            { bbl.sine.loco.sine.nomine }
          if$
        }
        { format.publisher empty$ not
            { format.publisher }
            { "" }
          if$
        }
      if$
    }
  if$
}

FUNCTION {extract.before.dash}
{ duplicate$ empty$
    { pop$ "" }
    { 's :=
      #1 'charptr :=
      s text.length$ #1 + 'len :=
        { charptr len <
          s charptr #1 substring$ "-" = not
          and
        }
        { charptr #1 + 'charptr := }
      while$
      s #1 charptr #1 - substring$
    }
  if$
}

FUNCTION {extract.after.dash}
{ duplicate$ empty$
    { pop$ "" }
    { 's :=
      #1 'charptr :=
      s text.length$ #1 + 'len :=
        { charptr len <
          s charptr #1 substring$ "-" = not
          and
        }
        { charptr #1 + 'charptr := }
      while$
        { charptr len <
          s charptr #1 substring$ "-" =
          and
        }
        { charptr #1 + 'charptr := }
      while$
      s charptr global.max$ substring$
    }
  if$
}

FUNCTION {extract.before.slash}
{ duplicate$ empty$
    { pop$ "" }
    { 's :=
      #1 'charptr :=
      s text.length$ #1 + 'len :=
        { charptr len <
          s charptr #1 substring$ "/" = not
          and
        }
        { charptr #1 + 'charptr := }
      while$
      s #1 charptr #1 - substring$
    }
  if$
}

FUNCTION {extract.after.slash}
{ duplicate$ empty$
    { pop$ "" }
    { 's :=
      #1 'charptr :=
      s text.length$ #1 + 'len :=
        { charptr len <
          s charptr #1 substring$ "-" = not
          and
          s charptr #1 substring$ "/" = not
          and
        }
        { charptr #1 + 'charptr := }
      while$
        { charptr len <
          s charptr #1 substring$ "-" =
          s charptr #1 substring$ "/" =
          or
          and
        }
        { charptr #1 + 'charptr := }
      while$
      s charptr global.max$ substring$
    }
  if$
}

FUNCTION {format.year}
{ year empty$ not
    { year extract.before.slash extra.label * }
    { date empty$ not
        { date extract.before.dash extra.label * }
        { "empty year in " cite$ * warning$
          urldate empty$ not
            { "[" urldate extract.before.dash * extra.label * "]" * }
            { "" }
          if$
        }
      if$
    }
  if$
}

FUNCTION {format.periodical.year}
{ year empty$ not
    { year extract.before.slash
      "--" *
      year extract.after.slash
      duplicate$ empty$
        'pop$
        { * }
      if$
    }
    { date empty$ not
        { date extract.before.dash }
        { "empty year in " cite$ * warning$
          urldate empty$ not
            { "[" urldate extract.before.dash * "]" * }
            { "" }
          if$
        }
      if$
    }
  if$
}

FUNCTION {format.date}
{ date empty$ not
    { type$ "patent" = type$ "newspaper" = or
        { date }
        { format.year }
      if$
    }
    { year empty$ not
        { format.year }
        { "" }
      if$
    }
  if$
}

FUNCTION {format.editdate}
{ date empty$ not
    { "\allowbreak(" date * ")" * }
    { "" }
  if$
}

FUNCTION {format.urldate}
{ show.urldate show.url and entry.url empty$ not and
  is.pure.electronic or
  urldate empty$ not and
    { "\allowbreak[" urldate * "]" * }
    { "" }
  if$
}

FUNCTION {hyphenate}
{ 't :=
  ""
    { t empty$ not }
    { t #1 #1 substring$ "-" =
        { wave.dash.in.pages
            { "～" * }
            { "-" * }
          if$
            { t #1 #1 substring$ "-" = }
            { t #2 global.max$ substring$ 't := }
          while$
        }
        { t #1 #1 substring$ *
          t #2 global.max$ substring$ 't :=
        }
      if$
    }
  while$
}

FUNCTION {format.pages}
{ pages empty$
    { "" }
    { pages hyphenate }
  if$
}

FUNCTION {format.extracted.pages}
{ pages empty$
    { "" }
    { pages
      only.start.page
        'extract.before.dash
        'hyphenate
      if$
    }
  if$
}

FUNCTION {format.journal.volume}
{ volume empty$ not
    { bold.journal.volume
        { "\textbf{" volume * "}" * }
        { volume }
      if$
    }
    { "" }
  if$
}

FUNCTION {format.journal.number}
{ number empty$ not
    { "\allowbreak (" number * ")" * }
    { "" }
  if$
}

FUNCTION {format.journal.pages}
{ pages empty$
    { "" }
    { format.extracted.pages }
  if$
}

FUNCTION {format.periodical.year.volume.number}
{ year empty$ not
    { year extract.before.slash }
    { "empty year in periodical " cite$ * warning$ }
  if$
  volume empty$ not
    { ", " * volume extract.before.dash * }
    'skip$
  if$
  number empty$ not
    { "\allowbreak (" * number extract.before.dash * ")" * }
    'skip$
  if$
  "--" *
  year extract.after.slash empty$
  volume extract.after.dash empty$ and
  number extract.after.dash empty$ and not
    { year extract.after.slash empty$ not
        { year extract.after.slash * }
        { year extract.before.slash * }
      if$
      volume empty$ not
        { ", " * volume extract.after.dash * }
        'skip$
      if$
      number empty$ not
        { "\allowbreak (" * number extract.after.dash * ")" * }
        'skip$
      if$
    }
    'skip$
  if$
}

FUNCTION {check.url}
{ url empty$ not
    { "\url{" url * "}" * 'entry.url :=
      #1 'entry.is.electronic :=
    }
    { howpublished empty$ not
        { howpublished #1 #5 substring$ "\url{" =
            { howpublished 'entry.url :=
              #1 'entry.is.electronic :=
            }
            'skip$
          if$
        }
        { note empty$ not
            { note #1 #5 substring$ "\url{" =
                { note 'entry.url :=
                  #1 'entry.is.electronic :=
                }
                'skip$
              if$
            }
            'skip$
          if$
        }
      if$
    }
  if$
}

FUNCTION {output.url}
{ show.url is.pure.electronic or
  entry.url empty$ not and
    { new.block
      entry.url output
    }
    'skip$
  if$
}

FUNCTION {check.doi}
{ doi empty$ not
    { #1 'entry.is.electronic := }
    'skip$
  if$
}

FUNCTION {is.in.url}
{ 's :=
  s empty$
    { #1 }
    { entry.url empty$
        { #0 }
        { s text.length$ 'len :=
          entry.url text.length$ 'charptr :=
            { entry.url charptr len substring$ s = not
              charptr #0 >
              and
            }
            { charptr #1 - 'charptr := }
          while$
          charptr
        }
      if$
    }
  if$
}

FUNCTION {format.doi}
{ ""
  doi empty$ not
    { "" 's :=
      doi 't :=
      #0 'numnames :=
        { t empty$ not}
        { t #1 #1 substring$ 'tmp.str :=
          tmp.str "," = tmp.str " " = or t #2 #1 substring$ empty$ or
            { t #2 #1 substring$ empty$
                { s tmp.str * 's := }
                'skip$
              if$
              s empty$ s is.in.url or
                'skip$
                { numnames #1 + 'numnames :=
                  numnames #1 >
                    { ", " * }
                    { "DOI: " * }
                  if$
                  "\doi{" s * "}" * *
                }
              if$
              "" 's :=
            }
            { s tmp.str * 's := }
          if$
          t #2 global.max$ substring$ 't :=
        }
      while$
    }
    'skip$
  if$
}

FUNCTION {output.doi}
{ doi empty$ not show.doi and
  show.english.translation entry.lang lang.zh = and not and
    { new.block
      format.doi output
    }
    'skip$
  if$
}

FUNCTION {check.electronic}
{ "" 'entry.url :=
  #0 'entry.is.electronic :=
    'check.doi
    'skip$
  if$
    'check.url
    'skip$
  if$
  medium empty$ not
    { medium "MT" = medium "DK" = or medium "CD" = or medium "OL" = or
        { #1 'entry.is.electronic := }
        'skip$
      if$
    }
    'skip$
  if$
}

FUNCTION {format.eprint}
{ archivePrefix empty$ not
    { archivePrefix }
    { eprinttype empty$ not
        { archivePrefix }
        { "" }
      if$
    }
  if$
  's :=
  s empty$ not
    { s ": \eprint{" *
      url empty$ not
        { url }
        { "https://" s "l" change.case$ * ".org/abs/" * eprint * }
      if$
      * "}{" *
      eprint * "}" *
    }
    { eprint }
  if$
}

FUNCTION {output.eprint}
{ show.preprint eprint empty$ not and
    { new.block
      format.eprint output
    }
    'skip$
  if$
}

FUNCTION {format.note}
{ note empty$ not show.note and
    { note }
    { "" }
  if$
}

FUNCTION {output.translation}
{ show.english.translation entry.lang lang.zh = and
    { translation empty$ not
        { translation }
        { "[English translation missing!]" }
      if$
      " (in Chinese)" * output
      write$
      format.doi duplicate$ empty$ not
        { newline$
          write$
        }
        'pop$
      if$
      " \\" write$
      newline$
      "(" write$
      ""
      before.all 'output.state :=
    }
    'skip$
  if$
}

FUNCTION {empty.misc.check}
{ author empty$ title empty$
  year empty$
  and and
  key empty$ not and
    { "all relevant fields are empty in " cite$ * warning$ }
    'skip$
  if$
}

FUNCTION {monograph}
{ output.bibitem
  output.translation
  author empty$ not
    { format.authors }
    { editor empty$ not
        { format.editors }
        { "empty author and editor in " cite$ * warning$
          bbl.anonymous
        }
      if$
    }
  if$
  output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  format.series.vol.num.title "title" output.check
  "M" set.entry.mark
  format.mark "" output.after
  new.block
  format.translators output
  new.sentence
  format.edition output
  new.block
  format.address.publisher output
  year.after.author not
    { format.year "year" output.check }
    'skip$
  if$
  format.pages bbl.pages.colon output.after
  format.urldate "" output.after
  output.url
  output.doi
  new.block
  format.note output
  fin.entry
}

FUNCTION {incollection}
{ output.bibitem
  output.translation
  format.authors output
  author format.key output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  format.title "title" output.check
  "M" set.entry.mark
  format.mark "" output.after
  new.block
  format.translators output
  new.slash
  format.editors output
  new.block
  format.series.vol.num.booktitle "booktitle" output.check
  new.block
  format.edition output
  new.block
  format.address.publisher output
  year.after.author not
    { format.year "year" output.check }
    'skip$
  if$
  format.extracted.pages bbl.pages.colon output.after
  format.urldate "" output.after
  output.url
  output.doi
  new.block
  format.note output
  fin.entry
}

FUNCTION {periodical}
{ output.bibitem
  output.translation
  format.authors output
  author format.key output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  format.title "title" output.check
  "J" set.entry.mark
  format.mark "" output.after
  new.block
  format.periodical.year.volume.number output
  new.block
  format.address.publisher output
  year.after.author not
    { format.periodical.year "year" output.check }
    'skip$
  if$
  format.urldate "" output.after
  output.url
  output.doi
  new.block
  format.note output
  fin.entry
}

FUNCTION {journal.article}
{ output.bibitem
  output.translation
  format.authors output
  author format.key output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  title.in.journal
    { format.title "title" output.check
      "J" set.entry.mark
      format.mark "" output.after
      new.block
    }
    'skip$
  if$
  format.journal "journal" output.check
  year.after.author not
    { format.date "year" output.check }
    'skip$
  if$
  format.journal.volume output
  format.journal.number "" output.after
  format.journal.pages bbl.pages.colon output.after
  format.urldate "" output.after
  output.url
  output.doi
  new.block
  format.note output
  fin.entry
}

FUNCTION {patent}
{ output.bibitem
  output.translation
  format.authors output
  author format.key output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  format.title "title" output.check
  "P" set.entry.mark
  format.mark "" output.after
  new.block
  format.date "year" output.check
  format.urldate "" output.after
  output.url
  output.doi
  new.block
  format.note output
  fin.entry
}

FUNCTION {electronic}
{ #1 #1 check.electronic
  #1 'entry.is.electronic :=
  #1 'is.pure.electronic :=
  output.bibitem
  output.translation
  format.authors output
  author format.key output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  format.series.vol.num.title "title" output.check
  "EB" set.entry.mark
  format.mark "" output.after
  new.block
  format.address.publisher output
  year.after.author not
    { date empty$
        { format.date output }
        'skip$
      if$
    }
    'skip$
  if$
  format.pages bbl.pages.colon output.after
  format.editdate "" output.after
  format.urldate "" output.after
  output.url
  output.doi
  new.block
  format.note output
  fin.entry
}

FUNCTION {preprint}
{ output.bibitem
  output.translation
  author empty$ not
    { format.authors }
    { editor empty$ not
        { format.editors }
        { "empty author and editor in " cite$ * warning$
          bbl.anonymous
        }
      if$
    }
  if$
  output
  year.after.author
    { period.after.author
        'new.sentence
        'skip$
      if$
      format.year "year" output.check
    }
    'skip$
  if$
  new.block
  title.in.journal
    { format.series.vol.num.title "title" output.check
      "A" set.entry.mark
      format.mark "" output.after
      new.block
    }
    'skip$
  if$
  format.translators output
  new.sentence
  format.edition output
  new.block
  year.after.author not
    { date empty$
        { format.date output }
        'skip$
      if$
    }
    'skip$
  if$
  format.pages bbl.pages.colon output.after
  format.editdate "" output.after
  format.urldate "" output.after
  output.eprint
  output.url
  new.block
  format.note output
  fin.entry
}

FUNCTION {misc}
{ get.journal.title
  duplicate$ empty$ not
    { check.arxiv.preprint
        'preprint
        'journal.article
      if$
    }
    { pop$
      booktitle empty$ not
        'incollection
        { publisher empty$ not
            'monograph
            { eprint empty$ not archivePrefix empty$ not or
                'preprint
                { entry.is.electronic
                    'electronic
                    {
                      "Z" set.entry.mark
                      monograph
                    }
                  if$
                }
              if$
            }
          if$
        }
      if$
    }
  if$
  empty.misc.check
}

FUNCTION {archive}
{ "A" set.entry.mark
  misc
}

FUNCTION {article} { misc }

FUNCTION {book} { monograph }

FUNCTION {booklet} { book }

FUNCTION {collection}
{ "G" set.entry.mark
  monograph
}

FUNCTION {database}
{ "DB" set.entry.mark
  electronic
}

FUNCTION {dataset}
{ "DS" set.entry.mark
  electronic
}

FUNCTION {inbook} { book }

FUNCTION {inproceedings}
{ "C" set.entry.mark
  incollection
}

FUNCTION {conference} { inproceedings }

FUNCTION {legislation} { archive }

FUNCTION {map}
{ "CM" set.entry.mark
  misc
}

FUNCTION {manual} { monograph }

FUNCTION {mastersthesis}
{ "D" set.entry.mark
  monograph
}

FUNCTION {newspaper}
{ "N" set.entry.mark
  article
}

FUNCTION {online}
{ "EB" set.entry.mark
  electronic
}

FUNCTION {phdthesis} { mastersthesis }

FUNCTION {proceedings}
{ "C" set.entry.mark
  monograph
}

FUNCTION {software}
{ "CP" set.entry.mark
  electronic
}

FUNCTION {standard}
{ "S" set.entry.mark
  misc
}

FUNCTION {techreport}
{ "R" set.entry.mark
  misc
}

FUNCTION {unpublished} { misc }

FUNCTION {default.type} { misc }

MACRO {jan} {"January"}

MACRO {feb} {"February"}

MACRO {mar} {"March"}

MACRO {apr} {"April"}

MACRO {may} {"May"}

MACRO {jun} {"June"}

MACRO {jul} {"July"}

MACRO {aug} {"August"}

MACRO {sep} {"September"}

MACRO {oct} {"October"}

MACRO {nov} {"November"}

MACRO {dec} {"December"}

MACRO {acmcs} {"ACM Computing Surveys"}

MACRO {acta} {"Acta Informatica"}

MACRO {cacm} {"Communications of the ACM"}

MACRO {ibmjrd} {"IBM Journal of Research and Development"}

MACRO {ibmsj} {"IBM Systems Journal"}

MACRO {ieeese} {"IEEE Transactions on Software Engineering"}

MACRO {ieeetc} {"IEEE Transactions on Computers"}

MACRO {ieeetcad}
 {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}

MACRO {ipl} {"Information Processing Letters"}

MACRO {jacm} {"Journal of the ACM"}

MACRO {jcss} {"Journal of Computer and System Sciences"}

MACRO {scp} {"Science of Computer Programming"}

MACRO {sicomp} {"SIAM Journal on Computing"}

MACRO {tocs} {"ACM Transactions on Computer Systems"}

MACRO {tods} {"ACM Transactions on Database Systems"}

MACRO {tog} {"ACM Transactions on Graphics"}

MACRO {toms} {"ACM Transactions on Mathematical Software"}

MACRO {toois} {"ACM Transactions on Office Information Systems"}

MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}

MACRO {tcs} {"Theoretical Computer Science"}

FUNCTION {sortify}
{ purify$
  "l" change.case$
}

FUNCTION {chop.word}
{ 's :=
  'len :=
  s #1 len substring$ =
    { s len #1 + global.max$ substring$ }
    's
  if$
}

FUNCTION {format.lab.name}
{ "{vv~}{ll}{, jj}{, ff}" format.name$ 't :=
  t "others" =
    { citation.et.al }
    { t get.str.lang 'name.lang :=
      name.lang lang.zh = name.lang lang.ja = or
        { t #1 "{ll}{ff}" format.name$ }
        { t #1 "{vv~}{ll}" format.name$ }
      if$
    }
  if$
}

FUNCTION {format.lab.names}
{ 's :=
  s #1 format.lab.name 'short.label :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  ""
  numnames 'namesleft :=
    { namesleft #0 > }
    { s nameptr format.lab.name citation.et.al =
      numnames citation.et.al.min #1 - > nameptr citation.et.al.use.first > and or
        { bbl.space *
          citation.et.al *
          #1 'namesleft :=
        }
        { nameptr #1 >
            { namesleft #1 = citation.and "" = not and
                { citation.and * }
                { ", " * }
              if$
            }
            'skip$
          if$
          s nameptr format.lab.name *
        }
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {author.key.label}
{ author empty$
    { key empty$
        { cite$ #1 #3 substring$ }
        'key
      if$
    }
    { author format.lab.names }
  if$
}

FUNCTION {author.editor.key.label}
{ author empty$
    { editor empty$
        { key empty$
            { cite$ #1 #3 substring$ }
            'key
          if$
        }
        { editor format.lab.names }
      if$
    }
    { author format.lab.names }
  if$
}

FUNCTION {author.key.organization.label}
{ author empty$
    { key empty$
        { organization empty$
            { cite$ #1 #3 substring$ }
            { "The " #4 organization chop.word #3 text.prefix$ }
          if$
        }
        'key
      if$
    }
    { author format.lab.names }
  if$
}

FUNCTION {editor.key.organization.label}
{ editor empty$
    { key empty$
        { organization empty$
            { cite$ #1 #3 substring$ }
            { "The " #4 organization chop.word #3 text.prefix$ }
          if$
        }
        'key
      if$
    }
    { editor format.lab.names }
  if$
}

FUNCTION {calc.short.authors}
{ "" 'short.label :=
  type$ "book" =
  type$ "inbook" =
  or
    'author.editor.key.label
    { type$ "collection" =
      type$ "proceedings" =
      or
        { editor empty$ not
            'editor.key.organization.label
            'author.key.organization.label
          if$
        }
        'author.key.label
      if$
    }
  if$
  'short.list :=
  short.label empty$
    { short.list 'short.label := }
    'skip$
  if$
}

FUNCTION {calc.label}
{ calc.short.authors
  short.list "]" contains
    { "{" short.list * "}" * }
    { short.list }
  if$
  "("
  *
  format.year duplicate$ empty$
  short.list key field.or.null = or
     { pop$ "" }
     'skip$
  if$
  duplicate$ "]" contains
    { "{" swap$ * "}" * }
    'skip$
  if$
  *
  'label :=
  short.label
  "("
  *
  format.year duplicate$ empty$
  short.list key field.or.null = or
     { pop$ "" }
     'skip$
  if$
  *
  'short.label :=
}

FUNCTION {sort.language.label}
{ entry.lang lang.zh =
    { lang.zh.order }
    { entry.lang lang.ja =
        { lang.ja.order }
        { entry.lang lang.en =
            { lang.en.order }
            { entry.lang lang.ru =
                { lang.ru.order }
                { lang.other.order }
              if$
            }
          if$
        }
      if$
    }
  if$
  #64 +
  int.to.chr$
}

FUNCTION {sort.format.names}
{ 's :=
  #1 'nameptr :=
  ""
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    {
      s nameptr "{vv{ } }{ll{ }}{  ff{ }}{  jj{ }}" format.name$ 't :=
      nameptr #1 >
        {
          "   "  *
          namesleft #1 = t "others" = and
            { "zzzzz" * }
            { numnames #2 > nameptr #2 = and
                { "zz" * year field.or.null * "   " * }
                'skip$
              if$
              t sortify *
            }
          if$
        }
        { t sortify * }
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {sort.format.title}
{ 't :=
  "A " #2
    "An " #3
      "The " #4 t chop.word
    chop.word
  chop.word
  sortify
  #1 global.max$ substring$
}

FUNCTION {anonymous.sort}
{ entry.lang lang.zh =
    { "yi4 ming2" }
    { "anon" }
  if$
}

FUNCTION {warn.empty.key}
{ entry.lang lang.zh =
    { "empty key in " cite$ * warning$ }
    'skip$
  if$
}

FUNCTION {author.sort}
{ key empty$
    { warn.empty.key
      author empty$
        { anonymous.sort }
        { author sort.format.names }
      if$
    }
    { key }
  if$
}

FUNCTION {author.editor.sort}
{ key empty$
    { warn.empty.key
      author empty$
        { editor empty$
            { anonymous.sort }
            { editor sort.format.names }
          if$
        }
        { author sort.format.names }
      if$
    }
    { key }
  if$
}

FUNCTION {author.organization.sort}
{ key empty$
    { warn.empty.key
      author empty$
        { organization empty$
            { anonymous.sort }
            { "The " #4 organization chop.word sortify }
          if$
        }
        { author sort.format.names }
      if$
    }
    { key }
  if$
}

FUNCTION {editor.organization.sort}
{ key empty$
    { warn.empty.key
      editor empty$
        { organization empty$
            { anonymous.sort }
            { "The " #4 organization chop.word sortify }
          if$
        }
        { editor sort.format.names }
      if$
    }
    { key }
  if$
}

FUNCTION {presort}
{ set.entry.lang
  set.entry.numbered
  show.url show.doi check.electronic
  #0 'is.pure.electronic :=
  calc.label
  label sortify
  "    "
  *
  sort.language.label
  "    "
  *
  type$ "book" =
  type$ "inbook" =
  or
    'author.editor.sort
    { type$ "collection" =
      type$ "proceedings" =
      or
        'editor.organization.sort
        'author.sort
      if$
    }
  if$
  *
  "    "
  *
  year field.or.null sortify
  *
  "    "
  *
  cite$
  *
  #1 entry.max$ substring$
  'sort.label :=
  sort.label *
  #1 entry.max$ substring$
  'sort.key$ :=
}

STRINGS { longest.label last.label next.extra last.extra.label }

INTEGERS { longest.label.width number.label }

FUNCTION {initialize.longest.label}
{ "" 'longest.label :=
  #0 int.to.chr$ 'last.label :=
  "" 'next.extra :=
  #0 'longest.label.width :=
  #0 'number.label :=
  "" 'last.extra.label :=
}

FUNCTION {forward.pass}
{
  last.label short.label =
    { "" 'extra.label :=
      last.extra.label text.length$ 'charptr :=
        { last.extra.label charptr #1 substring$ "z" =
          charptr #0 > and
        }
        { "a" extra.label * 'extra.label :=
          charptr #1 - 'charptr :=
        }
      while$
      charptr #0 >
        { last.extra.label charptr #1 substring$ chr.to.int$ #1 + int.to.chr$
          extra.label * 'extra.label :=
          last.extra.label #1 charptr #1 - substring$
          extra.label * 'extra.label :=
        }
        { "a" extra.label * 'extra.label := }
      if$
      extra.label 'last.extra.label :=
    }
    { "a" 'last.extra.label :=
      "" 'extra.label :=
      short.label 'last.label :=
    }
  if$
  number.label #1 + 'number.label :=
}

FUNCTION {reverse.pass}
{
  next.extra "b" =
    { "a" 'extra.label := }
    'skip$
  if$
  extra.label 'next.extra :=
  extra.label
  duplicate$ empty$
    'skip$
    { "{\natexlab{" swap$ * "}}" * }
  if$
  'extra.label :=
  label extra.label * 'label :=
}

FUNCTION {bib.sort.order}
{ sort.label  'sort.key$ :=
}

FUNCTION {begin.bib}
{   preamble$ empty$
    'skip$
    { preamble$ write$ newline$ }
  if$
  "\begin{thebibliography}{" number.label int.to.str$ * "}" *
  write$ newline$
  terms.in.macro
    { "\providecommand{\biband}{和}"
      write$ newline$
      "\providecommand{\bibetal}{等}"
      write$ newline$
    }
    'skip$
  if$
  "\providecommand{\natexlab}[1]{#1}"
  write$ newline$
  "\providecommand{\url}[1]{#1}"
  write$ newline$
  "\expandafter\ifx\csname urlstyle\endcsname\relax\else"
  write$ newline$
  "  \urlstyle{same}\fi"
  write$ newline$
  "\expandafter\ifx\csname href\endcsname\relax"
  write$ newline$
  "  \DeclareUrlCommand\doi{\urlstyle{rm}}"
  write$ newline$
  "  \def\eprint#1#2{#2}"
      write$ newline$
  "\else"
  write$ newline$
  "  \def\doi#1{\href{https://doi.org/#1}{\nolinkurl{#1}}}"
  write$ newline$
  "  \let\eprint\href"
      write$ newline$
  "\fi"
      write$ newline$
    }

FUNCTION {end.bib}
{ newline$
  "\end{thebibliography}" write$ newline$
}

READ

EXECUTE {init.state.consts}

EXECUTE {load.config}

ITERATE {presort}

SORT

EXECUTE {initialize.longest.label}

ITERATE {forward.pass}

REVERSE {reverse.pass}

ITERATE {bib.sort.order}

SORT

EXECUTE {begin.bib}

ITERATE {call.type$}

EXECUTE {end.bib}