# Acro package: Handling possessive case (apostrophe s)

The current v1.5 acro package (http://bitbucket.org/cgnieder/acro/wiki/Home, not the same as the also-popular acronym package) does not have an acronym invocation that automatically takes care of the possessive case, i.e., when the noun for which the acronym is followed immediately by an apostrophe "s". Some web search reveals some material that might be adaptable to handle the case, e.g., http://hstuart.dk/2007/08/03/programming-latex-—-writing-commands, but adapting it to the acro package will require much more knowledge of tex programming under-the-hood than I currently have. I realize that the knowledge can be acquired, but unfortunately, I have to make choices based on my timelines as well. This means rewording an otherwise efficiently constructed sentence to avoid apostrophe "s".

Would this be trivial for someone to adapt for the acro package?

• As I'm no native speaker and my language has no possessive case apostrophe s: can you give an example of how long and short version should look like? Maybe a sentence containing both versions? – clemens Jul 23 '14 at 20:08
• @cgnieder: Off-topic comment: Take a look around of wrong genitive apostrophes in German language usage ;-) – user31729 Jul 23 '14 at 20:13
• @cgnieger: Assume that there exists an organization The Awesome Group (TAG). Assume that the 1st occurance in a document is: "The Awesome Group's (TAG's) Belly Scratching Division (BSD) is also awesome". Note the possessive apostrophe-s. In the same way that the acro package allows you to specify the plural (\acp{tag}), I would like to be able to specify a possessive apostrophe-s, e.g., \acas{tag} (assuming that the acronym name is "tag"). – user36800 Jul 28 '14 at 18:53
• For the record: I'm planning to add something bitbucket.org/cgnieder/acro/issue/41 – clemens Jun 14 '15 at 20:24
• There is some progress… I could make an update soon. One problem remains: genitive+plural won't possible with the mechanism as it stands now… – clemens Jul 19 '15 at 19:03

Since v2.0 acro has a concept of endings. It handles the plural forms this way and allows the definition of additional endings:

\ProvideAcroEnding{possessive}{'s}{'s}


This defines a lower level command \acro_possessive: which can be used to define new acro commands and defines a number of options to set the endings individually for certain acronyms.

Here is a complete example that also shows how to define suitable commands for acro.

\documentclass{article}
\usepackage{acro}

\ProvideAcroEnding {possessive} {'s} {'s}

\ExplSyntaxOn
\NewAcroCommand \acg
{
\acro_possessive:
\acro_use:n {#1}
}
\NewAcroCommand \acsg
{
\acro_possessive:
\acro_short:n {#1}
}
\NewAcroCommand \aclg
{
\acro_possessive:
\acro_long:n {#1}
}
\ExplSyntaxOff

\DeclareAcronym{MP}{
short            = MP ,
long             = Member of Parliament ,
long-plural-form = Members of Parliament ,
long-possessive-form = Member's of Parliament
}

\DeclareAcronym{cd}{
short = CD ,
long  = compact disc
}

\begin{document}

first: \acg{cd}; \acg{MP}

short: \acsg{cd}; \acsg{MP}

long: \aclg{cd}; \aclg{MP}

\end{document}


Note that several endings can't really be applied to an acronym. If we were to define

\NewAcroCommand \acpg
{
\acro_possessive:
\acro_plural:
\acro_use:n {#1}
}


we'd get CDs's