%%
%% \iffalse filename: hiabbrev.dtx \fi
%%
%<*doc>
\input driver
\thisis{hiabbrev}{Abbreviations}

This package provides for abbreviating texts according to tables of
abbreviations. It also provides functions for removing spaces between dotted
initials. The abbreviation algorithms are fully expandable so that they may be
used within |\edef| definitions.

%</doc>
%<*package>
%    \begin{macrocode}
\ProvidesPackage{hiabbrev}[2017/08/14 Abbreviations]
\RequirePackage{etoolbox}
\RequirePackage{histrings}
%    \end{macrocode}
%</package>
%<*doc>
\subsection{Abbreviation Classes}

There may be multiple abbreviation classes, namely separate schemes of
abbreviations with different words abbreviated in each.

An abbreviation class is defined in the macro |\abb@class@|\meta{name}. Within
that class are a further set of macros of the form
|\abb@class@|\meta{name}|@|\meta{word}, where \meta{word} is the first word of
the text to be abbreviated. The value of the macro is a list of two-item pairs
of the form:
\begin{demo}
  \marg{remaining text}\marg{abbrev.}
\end{demo}
The list is organized with the longest abbreviations first, ensuring that longer
abbreviations take precedence over shorter ones.

\MacroSpec\abb@new \marg{class} creates a new abbreviation class.

%</doc>
%<*package>
%    \begin{macrocode}
\def\abb@new#1{\@namedef{abb@class@#1}{}}%
%    \end{macrocode}
%
%</package>
%<*doc>

\MacroSpec\abb@add \marg{class}\marg{word}\marg{abbrev} \\
Adds an item to the abbreviation class. \meta{class} is the class, \meta{word}
the unabbreviated form, and \marg{abbrev} the abbreviated form.

If the unabbreviated form starts with an empty set of braces, then the given
abbreviation pair is treated as an initial-text abbreviation, which will only
abbreviate at the beginning of a text. That is, the abbrevation pairs:
\begin{demo}
\{\}Building $\rightarrow$ Bldg. \\
Building $\rightarrow$ Build.
\end{demo}
would produce abbreviations as follows:
\begin{demo}
The Building and Loan Office $\rightarrow$ The Build. and Loan Office \\
Building and Loan Office $\rightarrow$ Bldg. and Loan Office
\end{demo}

%</doc>
%<*package>
%    \begin{macrocode}
\def\abb@add#1#2#3{%
    \find@word{#2}{%
        \abb@add@punct{#1}{#3}%
    }{%
        \abb@add@group{#1}{#3}%
    }{%
        \abb@add@{#1}{#3}%
    }{%
        \abb@add@error{nothing}{}{}%
    }%
}
%    \end{macrocode}
%
% Processes an abbreviation pair where the unabbreviated text starts with a
% group. \#1 is the class, \#2 the abbreviated text, \#3 the group contents, and
% \#4 the remainder.
%
% If the group contains any text, then this is an error. Otherwise, an empty
% group at the beginning indicates an abbreviation that only matches at the
% start of the text. The initial-text abbreviation is implemented by storing the
% abbreviation as a continuation of a zero-width word.
%
%    \begin{macrocode}
\def\abb@add@group#1#2#3#4{%
    \ifstrempty{#3}{%
        \abb@add@{#1}{#2}{#3}{#4}%
    }{%
        \abb@add@error{group}{{#3}#4}%
    }%
}
\def\abb@add@error#1#2#3{%
    \PackageError{abbrev}{%
        Abbreviation text `#2#3' should not start with #1 `#2'
    }{%
        Review the text to be abbreviated
    }%
}
\def\abb@add@punct#1#2#3#4{%
    \@test \ifcat \relax\noexpand#3\fi{%
        \abb@add@error{control sequence}{#3}{#4}%
    }{%
        \abb@add@{#1}{#2}{#3}{#4}%
    }%
}
%    \end{macrocode}
%
% \#1 is the class, \#2 is the abbreviated form, \#3 the first word, \#4 the
% remainder.
%
%    \begin{macrocode}
\def\abb@add@#1#2#3#4{%
    \make@find@start{#3}% I think this is superfluous
    \expandafter\abb@add@@
        \csname abb@class@#1@#3\endcsname
        {#2}{#4}%
}
%    \end{macrocode}
%
% \#1 is the macro containing the class and first word, \#2 the abbreviated
% form, \#3 the remainder of the abbreviation.
%
%    \begin{macrocode}
\def\abb@add@@#1#2#3{%
    \make@find@start{#3}%
    \ifx#1\relax
        \def#1{{#3}{#2}}%
    \else
        \expandafter\abb@add@insert#1\@stop{#1}{#3}{#2}{}%
    \fi
}
%    \end{macrocode}
%
% Decides where to insert the new abbreviation. The key is that, because
% abbreviation matches are searched in sequence, longer strings need to come
% before substrings. For example, an abbreviation list:
%
% \begin{demo}
%   |{Aaa Bbb}{A.B.}{Aaa Bbb Ccc}{A.B.C.}|
% \end{demo}
%
% would be problematic since to abbreviate ``Aaa Bbb Ccc Y'', the first
% abbreviation pair would match and the second would never be considered. So the
% list properly needs to be ordered:
%
% \begin{demo}
%   |{Aaa Bbb Ccc}{A.B.C.}{Aaa Bbb}{A.B.}|
% \end{demo}
%
% \#1 and \#2 are the abbreviation pair being considered, \#3 is the rest of the
% list, \#4 is the list macro, \#5 the unabbreviated text to match, \#6 the
% abbreviation, and \#7 any material to prepend to the list.
%
%    \begin{macrocode}
\def\abb@add@insert#1#2#3\@stop#4#5#6#7{%
    \find@start{#1}{#5}{%
        \def#4{#7{#5}{#6}{#1}{#2}#3}%
        \@gobble
    }{%
        \ifstrempty{#3}{%
            \def#4{#7{#1}{#2}{#5}{#6}}%
        }{%
            \abb@add@insert#3\@stop{#4}{#5}{#6}{#7{#1}{#2}}%
        }%
    }%
}
%    \end{macrocode}
%
%
%</package>
%<*doc>


\subsection{Algorithm for Abbreviation}


\MacroSpec\abb@abbrev
\marg{class}\marg{text}\marg{callback} is the entrypoint for
abbreviating a text. \meta{class} is the class, \meta{text} is the
text to abbreviate, and \meta{callback} is a callback function for the result.

Text is abbreviated by reading each token in the text, using |\find@word| from
\sec{histrings}.

\begin{enumerate}
\item If the token is neither a word nor punctuation, do not process the item
and continue. In particular, text in groups is ignored for abbreviation
purposes.

\item For words and regular punctuation, retrieve the list of abbreviations
starting with this word. If there are none, then continue.

\item Iterate through each of the abbreviations associated with the word,
and see if the remainder of the text to be abbreviated starts with any of
the abbreviation texts. If so, then insert the relevant abbreviation
text.
\begin{itemize}
\item If the abbreviation fully deletes text, then check that the abbreviated
word is surrounded by spaces (or is at the beginning or end of the text). If
not, then the abbreviation is not performed since it would result in
disconnected punctuation. If it is, then delete any excess space.

\item If the abbreviation ends with a dot or space, then ensure that insertion
of the abbreviation does not create a double dot or space.
\end{itemize}
\end{enumerate}
Throughout the below description, the ``accumulated text'' is the text that has
been abbreviated at the beginning of the string, and the ``remaining text'' is
the text that has not been processed for abbreviation at the end of the string.
In the midst of determining whether to abbreviate something, the accumulated
text will not include the proposed abbreviation.

%</doc>
%<*package>
%
% To provide the special feature of initial-text abbreviations, we assume that
% the text starts off with a zero-width word, and try to abbreviate it. Since
% the initial-text abbreviations are stored under the command for zero-width
% words, this produces the desired result.
%
%    \begin{macrocode}
\def\abb@abbrev#1#2#3{%
    \abb@abbrev@wd{}{#2}{}{#1}{#3}%
}
%    \end{macrocode}
%
% Read the next token off of the remaining text to determine how to abbreviate
% it. \#1 is the remaining text to abbreviate, \#2 is the accumulated text, \#3
% is the class, \#4 is the callback. (\#2-\#4 are left on the stack.)
%    \begin{macrocode}
\def\abb@abbrev@acc#1{%
    \find@word{#1}\abb@abbrev@punct\abb@abbrev@grp\abb@abbrev@wd\abb@abbrev@end
}
%    \end{macrocode}
%
% Given that the first token of the remaining text is punctuation, determine how
% to abbreviate the symbol. If the first token is a macro, nothing is done.
% Otherwise, it is abbreviated as if it were a word in itself.
%
% \#1 is the punctuation, \#2 the remaining text, \#3 the accumulated text, \#4
% the class, \#5 the callback. (\#4--\#5 are left on the stack.)
%    \begin{macrocode}
\def\abb@abbrev@punct#1#2#3{%
    \@test \ifcat \relax\noexpand#1\fi{%
        \abb@abbrev@acc{#2}{#3#1}%
    }{%
        \abb@abbrev@wd{#1}{#2}{#3}%
    }%
}
%    \end{macrocode}
%
% Given that the token being abbreviated is a group, nothing is done. The
% content of the group is appended to the accumulated text, and the remaining
% text is further processed.
%
% \#1 is the group, \#2 the remaining text, \#3 the accumulated text, \#4 the
% class, \#5 the callback. (\#4--\#5 are left on the stack.)
%
%    \begin{macrocode}
\def\abb@abbrev@grp#1#2#3{%
    \abb@abbrev@acc{#2}{#3{#1}}%
}
%    \end{macrocode}
%
% Given that there is no more text left to abbreviate, invoke the callback with
% the accumulated text.
%
% \#1 is the accumulated text, \#2 the class, \#3 the callback.
%    \begin{macrocode}
\def\abb@abbrev@end#1#2#3{%
    #3{#1}%
}
%    \end{macrocode}
%
% Given that the token to be abbreviated is a word or abbreviatable punctuation,
% then search for an abbreviation starting with this word.
% If there is no defined abbreviation for the word, then continue to the next
% token. Otherwise, call |\abb@abbrev@wd@|, placing on the stack the list of
% abbreviations associated with the word.
%
% \#1 is the word under consideration, \#2 the remaining text (not including the
% word under consideration), \#3 the accumulated text, \#4 the class, \#5 the
% callback. (\#5 is left on the stack.)
%    \begin{macrocode}
\def\abb@abbrev@wd#1#2#3#4{%
    \@ifundefined{abb@class@#4@#1}{%
        \abb@abbrev@acc{#2}{#3#1}{#4}%
    }{%
        \expandafter\expandafter\expandafter\abb@abbrev@wd@
            \csname abb@class@#4@#1\endcsname \@stop
            {#1}{#2}{#3}{#4}%
    }%
}
%    \end{macrocode}
%
% Given that the word under consideration has abbreviations, consider
% all possible abbreviations starting with this word to see if they match the
% remaining text.
%
% \#1 is a candidate abbreviatable text; \#2 is the candidate abbreviation; \#3
% is the remainder of that list. \#4--\#8 are the args to |\abb@abbrev@wd|,
% namely \#4 the word under consideration, \#5 the remaining text not including
% the word under consideration, \#6 the accumulated text, \#7 the class, and \#8
% the callback. (\#7--\#8 are left on the stack.)
%
%    \begin{macrocode}
\def\abb@abbrev@wd@#1#2#3\@stop#4#5#6{%
    \find@start{#1}{#5}{%
        \abb@abbrev@found{#6}{#2}%
    }{%
        \@iden
    }%
%    \end{macrocode}
% This is the ``bailout'' content, to be executed if \#1 does not match
% the remaining text. It is executed if the |\find@start| above fails to
% match, or it is presented as argument \#4 to |\abb@abbrev@found|. What it does
% is:
% \begin{itemize}
% \item If there are no remaining abbreviation candidates, then attach the word
% under consideration to the accumulated text and proceed to abbreviate the
% remaining text.
% \item If there are remaining abbreviation candidates, then proceed to the next
% one.
% \end{itemize}
%    \begin{macrocode}
    {%
        \ifstrempty{#3}{%
            \abb@abbrev@acc{#5}{#6#4}%
        }{%
            \abb@abbrev@wd@#3\@stop{#4}{#5}{#6}%
        }%
    }%
}
%    \end{macrocode}
%
% Given that a candidate abbreviation has matched, determine whether the
% abbreviation should actually be performed, and execute it if so. An
% abbreviation should not be peformed if the immediately following text is a
% word character, because that would result in breaking a word in the middle of
% an abbreviation.
%
% \#1 is the accumulated text, \#2 is the abbreviation to add,
% \#3 is the remaining text not including any of the text to be abbreviated, \#4
% is the command to run if we bail out (that is, if no abbreviation is to be
% made using this candidate), \#5 is the class, and \#6 is the callback.
% (\#5--\#6 are left on the stack.)
%
%    \begin{macrocode}
\def\abb@abbrev@found#1#2#3#4{%
    %
    \@ifstartswithwordchar{#3}{%
        #4%
    }{%
        \ifstrempty{#2}{%
            \abb@abbrev@delete{#1\abb@abbrev@delete!#3}{#4}%
        }{%
            \find@try\find@start{%
                { }{\abb@abbrev@maybechop{ }}%
                {.}{\abb@abbrev@maybechop{.}}%
            }{#3}{\abb@abbrev@acc}%
            {#3}{#1#2}%
        }%
    }%
}
%    \end{macrocode}
%
% Given that an abbreviation can be executed and will only delete text,
% determine whether the abbreviation is executable. A deletion can be executed
% only if the remaining text is fully surrounded by spaces (or the beginning/end
% of text); otherwise joining punctuation might be left stranded. If it is
% executed, reconcile the remaining spaces.
%
% \#1 is the accumulated text plus the remaining text, separated by
% |\abb@abbrev@delete!|. \#2 is the bailout macro sequence (to be executed if
% this abbreviation fails), \#3 is the class, and \#4 is the callback. (\#3--\#4
% are left on the stack.)
%    \begin{macrocode}
\def\abb@abbrev@delete#1#2{%
    \find@in{ \abb@abbrev@delete! }{#1}{%
        \abb@abbrev@delete@
    }{%
        \find@eq{\abb@abbrev@delete!}{#1}{%
            \abb@abbrev@end{}%
        }{%
            \find@end{ \abb@abbrev@delete!}{#1}{%
                \abb@abbrev@end
            }{%
                \find@start{\abb@abbrev@delete! }{#1}{%
                    \abb@abbrev@acc
                }{%
                    \@firstoftwo{#2}%
                }{}% Empty argument is the empty accumulated text
            }%
        }%
    }%
}
\make@find@in{ \abb@abbrev@delete! }
\make@find@start{\abb@abbrev@delete! }
\make@find@end{ \abb@abbrev@delete!}
\make@find@eq{\abb@abbrev@delete!}
%    \end{macrocode}
%
% Given that an abbreviation led to a deletion and the abbreviation was
% surrounded by two spaces, delete one space and continue the abbreviation
% process. \#1 is the accumulated text with a trailing space deleted, \#2 the
% remaining text with a leading space deleted, \#3 is the class, and \#4 is the
% callback. (\#3--\#4 are left on the stack.)
%
%    \begin{macrocode}
\def\abb@abbrev@delete@#1#2{%
    \abb@abbrev@acc{ #2}{#1}%
}
%    \end{macrocode}
%
% \#1 is the character to test for potential removal at the end of the
% accumulated text, \#2 is the remaining text with the character removed, \#3 is
% the remaining text without the character removed, and \#4 is the accumulated
% text. \#5 is the class, \#6 the callback (\#5-\#6 are left on the stack).
%
%    \begin{macrocode}
\def\abb@abbrev@maybechop#1#2#3#4{%
    \find@end{#1}{#4}{%
        \@firstoftwo{\abb@abbrev@acc{#2}{#4}}%
    }{\abb@abbrev@acc{#3}{#4}}%
}%
\make@find@start{.}
\make@find@start{ }
\make@find@end{.}
\make@find@end{ }
%    \end{macrocode}
%
%</package>
%<*doc>

\subsection{Removal of Spaces Between Dotted Initials}

\MacroSpec\abb@initialdots
\marg{text}\marg{dot}\marg{callback} processes a text to
remove dots between single-letter initials. Given a text, it will convert
sequences such as ``A. A. Milne'' to ``A.A. Milne'' and ``F. 4th'' to ``F.4th''.
\meta{text} is the text to process and \meta{callback} is the callback to run on
the resulting output.

\meta{dot} is the dot character to search for. According to some abbreviation
schemes, it is desirable not to collapse spaces between single initials when the
initials refer to different classes of words.
\DescribeMacro\abb@dot
The macro |\abb@dot| can be used in the place of the period character to
indicate this differentiation between classes.

For example, the text ``Northern University Law Journal'' may be abbreviated to
``N.U. L.J.'' with only the first and third spaces collapsed, but not the second
because institution words should not be joined with publication words. This can
be implemented by abbreviating publication words with |\abb@dot| (shown here for
an abbreviation class |journal|):
\begin{demo}
|\abb@new{journal}|\\
|\abb@add{journal}{Northern}{N.}|\\
|\abb@add{journal}{University}{U.}|\\
|\abb@add{journal}{Law}{L\abb@dot}|\\
|\abb@add{journal}{Journal}{J\abb@dot}|
\end{demo}
Now when the text is abbreviated with |\abb@abbrev|, it produces:
\begin{demo}
\verb*|N. U. L\abb@dot J\abb@dot|
\end{demo}
The dot removal algorithm can now be run twice, once with a period as \meta{dot}
and once with |\abb@dot|, thereby producing the desired text.

%</doc>
%<*package>
%
% This uses |\find@next| on the text with a state
% machine having states described below.
% Each state has macros for each of the possible find results from \find@next.
% Additionally, these items are always left on the token stack:
% \begin{itemize}
% \item the processed text
% \item the deferred text
% \item the dot character
% \item the final callback
% \end{itemize}
%
% Initial entrypoint. \#1 is the text, \#2 is the character to treat as a dot,
% and \#3 is the callback for the result.
%    \begin{macrocode}
\def\abb@initialdots#1#2#3{%
    \abb@id@a{#1}%
    {}% Initially the processed text is empty.
    {}% Deferred text is empty.
    {#2}% The dot character.
    {#3}% At end of the macro stack for use by \abb@id@done
}
\def\abb@id@done#1#2#3#4{%
    #4{#1#2}%
}
%    \end{macrocode}
%
% a. Initial state.
%    \begin{itemize}
%    \item On letter, go to b.
%    \item Otherwise go to a.
%    \end{itemize}
%
%    \begin{macrocode}
\def\abb@id@a#1{%
    \find@next{#1}\abb@id@backtoa\abb@id@backtoa\abb@id@a@letter\abb@id@done
}
\def\abb@id@backtoa#1#2#3#4{%
    \abb@id@a{#2}{#3#4#1}{}%
}
\let\abb@id@a@space\abb@id@backtoa
\let\abb@id@a@group\abb@id@backtoa
\def\abb@id@a@letter#1#2#3#4{%
    \@ifletter{#1}{%
        \abb@id@b{#2}{#3#4#1}{}%
    }{%
        \@ifdigit{#1}{%
            \abb@id@d{#2}{#3#4#1}{}%
        }{%
            \abb@id@a{#2}{#3#4#1}{}%
        }%
    }%
}
%    \end{macrocode}
%
% b. Seen a single letter.
%    \begin{itemize}
%    \item On dot, go to c.
%    \item On letter, go to d.
%    \item Otherwise go to a.
%    \end{itemize}
%
%    \begin{macrocode}
\def\abb@id@b#1{%
    \find@next{#1}\abb@id@b@space\abb@id@a@group\abb@id@b@letter\abb@id@done
}
\let\abb@id@b@space\abb@id@backtoa
\let\abb@id@b@group\abb@id@backtoa
\def\abb@id@b@letter#1#2#3#4#5{%
    \@ifletter{#1}{%
        \abb@id@d{#2}{#3#4#1}{}%
    }{%
        \@test\ifx#1#5\fi{%
            \abb@id@c{#2}{#3#4#1}{}%
        }{%
            \abb@id@a{#2}{#3#4#1}{}%
        }%
    }%
    {#5}% Put the dot character back on the stack
}
%    \end{macrocode}
%
% c. Seen a dot after b.
%    \begin{itemize}
%    \item On space, go to e.
%    \item On letter, go to b.
%    \item Otherwise, go to a.
%    \end{itemize}
%
%    \begin{macrocode}
\def\abb@id@c#1{%
    \find@next{#1}\abb@id@c@space\abb@id@c@group\abb@id@c@letter\abb@id@done
}
\def\abb@id@c@space#1#2#3#4{%
    \abb@id@e{#2}{#3#4}{#1}%
}
\let\abb@id@c@group\abb@id@backtoa
\def\abb@id@c@letter#1#2#3#4{%
    \@ifletter{#1}{%
        \abb@id@b{#2}{#3#4#1}{}%
    }{%
        \@ifdigit{#1}{%
            \abb@id@d{#2}{#3#4#1}{}%
        }{%
            \abb@id@a{#2}{#3#4#1}{}%
        }%
    }%
}
%    \end{macrocode}
%
% d. In a word
%    \begin{itemize}
%    \item On letter, go to d.
%    \item Otherwise go to a.
%    \end{itemize}
%
%    \begin{macrocode}
\def\abb@id@d#1{%
    \find@next{#1}\abb@id@d@space\abb@id@d@group\abb@id@d@letter\abb@id@done
}
\let\abb@id@d@space\abb@id@backtoa
\let\abb@id@d@group\abb@id@backtoa
\def\abb@id@d@letter#1#2#3#4{%
    \@ifwordchar{#1}{%
        \abb@id@d{#2}{#3#4#1}{}%
    }{%
        \abb@id@a{#2}{#3#4#1}{}%
    }%
}
%    \end{macrocode}
% e. Seen a space after c
%    \begin{itemize}
%    \item On letter, go to f.
%    \item On number, collapse the space and go to d.
%    \item Otherwise, go to a.
%    \end{itemize}
%
%    \begin{macrocode}
\def\abb@id@e#1{%
    \find@next{#1}\abb@id@e@space\abb@id@e@group\abb@id@e@letter\abb@id@done
}
\def\abb@id@e@space#1#2#3#4{%
    \abb@id@e{#2}{#3}{#1}%
}
\let\abb@id@e@group\abb@id@backtoa
\def\abb@id@e@letter#1#2#3#4{%
    \@ifletter{#1}{%
        \abb@id@f{#2}{#3}{#4#1}%
    }{%
        \@ifdigit{#1}{%
            \abb@id@d{#2}{#3#1}{}%
        }{%
            \abb@id@a{#2}{#3#4#1}{}%
        }%
    }%
}
%    \end{macrocode}
% f. Seen a single letter after e
%    \begin{itemize}
%    \item On dot, collapse the space and go to c.
%    \item On letter, go to d.
%    \item Otherwise, go to a.
%    \end{itemize}
%
%    \begin{macrocode}
\def\abb@id@f#1{%
    \find@next{#1}\abb@id@f@space\abb@id@f@group\abb@id@f@letter\abb@id@done
}
\let\abb@id@f@space\abb@id@backtoa
\let\abb@id@f@group\abb@id@backtoa
\def\abb@id@f@letter#1#2#3#4#5{%
    \@ifwordchar{#1}{%
        \abb@id@d{#2}{#3#4#1}{}%
    }{%
        \@test\ifx#1#5\fi{%
            \abb@id@f@stripspace{#1}{#2}{#3}#4%
        }{%
            \abb@id@a{#2}{#3#4#1}{}%
        }%
    }%
    {#5}%
}
\def\abb@id@f@stripspace#1#2#3#4{%
    \abb@id@c{#2}{#3#4#1}{}%
}
%    \end{macrocode}
%
% A token for dots.
%
%    \begin{macrocode}
\def\abb@dot{.}
%    \end{macrocode}
%
% \section{Options}
%
%    \begin{macrocode}
\ProcessOptions\relax
%    \end{macrocode}
%
%</package>
%<*test>

\section{hiabbrev.dtx}

\begingroup
    \abb@new{test}
    \abb@add{test}{Company}{Co.}
    \abb@add{test}{Big Company}{BigCo.}
    \abb@add{test}{Really Big}{R.B.}
    \abb@add{test}{Big Company Machines}{B.C.M.}
    \abb@add{test}{Enormous Example}{Really Big Ex.}
    \abb@add{test}{{}First Company}{FiComp.}
    \abb@add{test}{delete}{}

    \def\abbrevtest#1#2{\AssertCallback{\abb@abbrev{test}{#1}}{#2}}

    \abbrevtest{Company}{Co.}
    \abbrevtest{The Company}{The Co.}
    \abbrevtest{Company Treasure}{Co. Treasure}
    \abbrevtest{The Company Treasure}{The Co. Treasure}
    \abbrevtest{The Companying Art}{The Companying Art}
    \abbrevtest{Companying Art}{Companying Art}
    \abbrevtest{AcCompany Art}{AcCompany Art}
    \abbrevtest{An AcCompany Art}{An AcCompany Art}
    \abbrevtest{An Ac{}Company Art}{An Ac{}Co. Art}

    \abbrevtest{Big Company}{BigCo.}
    \abbrevtest{The Big Company}{The BigCo.}
    \abbrevtest{The Big Company Treasure}{The BigCo. Treasure}
    \abbrevtest{The Big Company's Treasure}{The BigCo.'s Treasure}
    \abbrevtest{The Big Company-Treasure}{The BigCo.-Treasure}

    \abbrevtest{Really Big Company}{R.B. Co.}
    \abbrevtest{The Really Big Company Treasure}{The R.B. Co. Treasure}

    \abbrevtest{Big Company Machines}{B.C.M.}
    \abbrevtest{The Big Company Machines}{The B.C.M.}
    \abbrevtest{The Big Company Machines Works}{The B.C.M. Works}
    \abbrevtest{The Big Company Machinesys}{The BigCo. Machinesys}

    % Should not re-abbreviate Really Big
    \abbrevtest{Enormous Example}{Really Big Ex.}

    \meaning\abb@class@test@

    \abbrevtest{First Company}{FiComp.}
    \abbrevtest{First Company Treasure}{FiComp. Treasure}
    \abbrevtest{The First Company}{The First Co.}
    \abbrevtest{The First Company Treasure}{The First Co. Treasure}

    \abbrevtest{abc delete def}{abc def}
    \abbrevtest{abc delete}{abc}
    \abbrevtest{delete def}{def}
    \abbrevtest{delete}{}
    \abbrevtest{a delete-fail}{a delete-fail}
    \abbrevtest{a-delete fail}{a-delete fail}
    \abbrevtest{Really Big delete Company}{R.B. Co.}
    \abbrevtest{Really Big delete-Company}{R.B. delete-Co.}
\endgroup

%</test>