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\input plainpkg
\ProvidesPackage{catchdq}[2015/05/22 v0.21 typographic dqs (UL)]
%% %% rm. "simple" -- too long -- 2015/05/22
%%
%% Copyright (C) 2012 2015 Uwe Lueck,
%% http://www.contact-ednotes.sty.de.vu
%% -- author-maintained in the sense of LPPL below --
%%
%% This file can be redistributed and/or modified under
%% the terms of the LaTeX Project Public License; either
%% version 1.3c of the License, or any later version.
%% The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%% There is NO WARRANTY (actually somewhat experimental).
%%
%% Please report bugs, problems, and suggestions via
%%
%% http://www.contact-ednotes.sty.de.vu
%%
%% == Purpose and Usage ==
%%
%% === Installing and Calling ===
%% The file `catchdq.sty' is provided ready,
%% installation only requires
%% putting it somewhere where \TeX\ finds it
%% (which may need updating the filename data
%% base).\urlfoot{ukfaqref}{inst-wlcf}
%% However, the files `plainpkg.tex' and `stacklet.sty' %% stacklet 2012/09/19
%% must be installed likewise.
%%
%% \emph{With} \LaTeX, the file should be loaded by `\RequirePackage{catchdq}'
%% or `\usepackage{catchdq}'.
%%
%% \emph{Without} \LaTeX, load it by `\input catchdq.sty'.
%%
%% As explained in `plainpgk-doc.pdf', however, ``generic"
%% packages based on 'plainpkg' should load 'catchdq' by
%% `\RequirePackage{catchdq}'.
%%
%% === Commands and Syntax ===
%% \label{sec:catchdq-cmds}
%% 'catchdq.sty' (indirectly) allows using |"<no-dqs>"|
%% for surrounding <no-dqs> with typographical quotation marks,
%% using that double quote |"| as an active character.
%% As rendering that `"' active during defining macros can
%% corrupt the latter, the user (or package writer) must
%% activate that `"' explicitly by |\catchdqs|.
%%
%% Further difficulties may arise after `\catchdqs',
%% various ways to get around them are described in the remaing sections.
%%
%% == The Code ==
%% === Required ===
%% The package is an application (of ideas of) 'actcodes.sty':
\RequirePackage{actcodes}
%%
%% === The Core: \cs{catchdq} ===
%% % \label{sec:catchdq-core}
%% |\catchdq<no-dqs>"| will expand to |\dqtd{<no-dqs>}|,
%% provided the \acro{ASCII} double quote is an active character:
{\MakeActive\"\gdef\catchdq#1"{\dqtd{#1}}}
%%
%% === What Double Quotes Actually Are ===
%% |\dqtd| in turn is a kind of ``variable." 'blog.sty' offered
%% |\endqtd| for English typographical double quotes,
%% |\dedqtd| for German ones, and |\asciidqtd| for ``non-typographical"
%% double quotes (as needed for \acro{XML} attributes).
%% |\asciidq| accesses a single \acro{ASCII} double quote,
%% |\enldq| a single English typographical left one,
%% |\enrdq| a single English typographical right one.
%% (It may be useful to access them indepentently of each other,
%% in certain complex situations ...)
%% 'blog.sty', dealing with \acro{HTML}, of course has different ideas
%% about them TODO.
\gdef\asciidq{"}
\gdef\asciidqtd#1{"#1"}
%% We allow loading 'catchdq' \emph{after} another package
%% (such as 'blog.sty') has chosen meanings for `\endqtd' and the
%% like. Before v0.21, definedness was tested by
%% `\ifx'...`\undefined', which two times fell
%% prey to some earlier `\@ifundefined'. So now:
\begingroup \escapechar=-1
\def\provass#1#2#3{%
\expandafter\ifx\csname \string#2\endcsname\relax #1#2#3\fi}
\provass \gdef \enldq {{``}}
\provass {\global\let} \enrdq \asciidq
\provass \gdef \endqtd {#1{\enldq#1\enrdq}}
%% Typographical alternatives to `\endqtd' may be obtained
%% from \ctanpkgstyref{ngerman} or so, if you are smart ...
%% %% <- 2012/09/20 ->
%% (see Section~\ref{sec:sw} for how it works):
\provass \gdef \dedqtd {#1{\glqq#1\grqq}}
%% 'blog.sty', dealing with \acro{HTML}, had a different idea
%% about `\endqtd' of course. It has also used the mechanism of
%% the \ctanpkgref{langcode} package that allows using `\dqtd' and other
%% language-depended constructs with an ``implicit" choice according
%% to the ``current language code," which should appear soon.
%%
%% === Switching ===
%% \label{sec:sw}
%% 'blog.sty' usually does a single switch which gets a new name now:
%% |\catchdqs|.
\gdef\catchdqs{\MakeActiveLet\"\catchdq}
%% After this, |"<no-dqs>"| will expand to `\dqtd{#1}'.
%% The default expansion for |\dqtd| will be |\endqtd|:
\provass {\global\let} \dqtd \endqtd
%% Might be done by |\endqs|---when there are alternatives,
%% but 'blog.sty' and 'langcode.sty' do this in a different way ... TODO
% \gdef\endqs{\let\dqtd\endqtd}
% \ifx\dqtd\undefined \global\endqs \fi
\endgroup
%% \catchdqs Actually, here is a little "Tessst"~...
%% \let\dqtd\dedqtd \ and here with "doytshe doppleta unf..." $\dots$ \
%% %% anf -> unf 2015/05/22
%% The latter has been achieved by
%% \[`\usepackage{ngerman} \originalTeX'\]
%% \MakeOther\"
%%
%% |\MakeOther\"| may switch off catching mode (---done just before,
%% as \ctanpkgref{niceverb} at present doesn't render it verbatim).
%% 'actcodes' suggests
%% a different way to return from the `\catchdqs' state:
%% Let the character active and change its meaning only, let it
%% \emph{expand} to its ``other" version---by |\activeasciidqs|?
%% |\MakeActiveOther\"| and \catchdqs
%% \let"\asciidq
%% |\let"\asciidq| (it works!) or |\MakeActiveLet\"\asciidq|
%% (abbreviate as `\activeasciidqs'?) ... In 'blog.sty', there never
%% was a need for switching back. We must rework interaction with
%% 'niceverb' and can perhaps simplify the latter, ... TODO
%%
%% === Leaving and Version History ===
\endinput
%%
%% VERSION HISTORY
v0.1 2010/11/13 in texblog.fdf
v0.2 2012/09/17 own file, new ideas ...
2012/09/19 doc: stacklet
2012/09/20 \dedqtd conditionally; reworked doc.,
tested ngerman.sty
v0.21 2015/05/22 better test for undefinedness
|
