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Diffstat (limited to 'Master/texmf-dist/tex/generic/catcodes/actcodes.sty')
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diff --git a/Master/texmf-dist/tex/generic/catcodes/actcodes.sty b/Master/texmf-dist/tex/generic/catcodes/actcodes.sty new file mode 100644 index 00000000000..3e6f516592f --- /dev/null +++ b/Master/texmf-dist/tex/generic/catcodes/actcodes.sty @@ -0,0 +1,146 @@ + \input plainpkg +\ProvidesPackage{actcodes}[2012/09/19 v0.2 active characters (UL)] +%% +%% Copyright (C) 2012 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 == +%% The package derives from switching category codes +%% in the 'nicetext' and 'morehype' bundles and should +%% improve them. +%% +%% === Installing and Calling === +%% The file `actcodes.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{actcodes}' +%% or `\usepackage{actcodes}'. +%% +%% \emph{Without} \LaTeX, load it by `\input actcodes.sty'. +%% +%% As explained in `plainpgk-doc.pdf', however, ``generic" +%% packages based on 'plainpkg' should load 'actcodes' by +%% `\RequirePackage{actcodes}'. +%% +%% === Commands and Syntax === +%% \label{sec:actcodes-cmds} +%% 'actcodes.sty' provides \ |\MakeActive|, |\MakeActiveAss|, +%% |\MakeActiveDef|, |\MakeActiveLet|, +%% |\MakeOther|, |\MakeActiveOther| \ with rather obvious +%% syntax---you find more detailed descriptions +%% mixed with implementation below ... TODO +%% ---Without \LaTeX, the latter's internal |\@gobble<arg>| +%% is provided as well. +%% +%% == The Code == +%% === Our Private Letters === +\PushCatMakeLetterAt +%% +%% === The Core === +%% |\MakeActiveAss<ass-fun>\<char><ass-args>| ``activates" <char> +%% and then applies assignment function <ass-fun> with arguments +%% <ass-args> to it. The code derives from \LaTeX's +%% `\@sverb' and `\do@noligs' and was also discussed +%% on the \acro{LATEX-L} mailing list September 2010 +%% (Will Robertson; Heiko Oberdiek). +%% The present definition generalizes +%% `\MakeActiveDef' and `\MakeActiveLet' of my earlier packages. +\gdef\MakeActiveAss#1#2{% + \MakeActive#2% + \begingroup \lccode`\~`#2\relax \lowercase{\endgroup #1~}} +%% I was reluctant to provide |\MakeActive\<char>|, +%% but with 'catchdq.sty', it would be better ... %% 2012/09/16 +\gdef\MakeActive#1{\catcode`#1\active} +%% ... it just ``revives" the meaning that the corresponding +%% active-character token last time ... +%% +%% === \cs{def} and \cs{let} === +%% |\MakeActiveDef\<char><parameters>{<replace>}| +%% has been employed in 'fifinddo' and 'blog' +%% (which is based on 'fifinddo') so far. +\gdef\MakeActiveDef{\MakeActiveAss\def} +%% W.r.t.\ the definition of this `\MakeActiveDef', +%% Heiko Oberdiek remarked that it allows \emph{macro parameters}, +%% as opposed to my earlier definition in 'fifinddo'. +%% Without parameters, this kind of macro has been used for +%% conversion of text encodings ('atari.fdf', +%% and I thought this was the idea of \ctanpkgref{stringenc} ...). +%% +%% |\MakeActiveLet\<char><cmd>| has been provided in 'niceverb' so far. +%% The present package has been made in order to have +%% `\MakeActiveLet' with 'blog.sty' as well, it was too annoying +%% to use `\MakeActiveDef' there so often. +\gdef\MakeActiveLet{\MakeActiveAss\let} +%% +%% === Switching Back \textellipsis === +%% Sometimes, the ``active" behaviour of <char> is too difficult, +%% and you may want to switch bach to its ``simple" way ... +%% This may work by |\MakeOther\<char>| ... +%% with \LaTeX, `\MakeOther' just is `\@makeother' ... +\ifltx \global\let\MakeOther\@makeother +\else \gdef\MakeOther#1{\catcode`#112\relax} +\fi +%% But within a macro (or other) argument, you can't change the `\catcode'. +%% (I~lost some time by not realizing that it was within a large argument +%% where I tried to switch the `\catcode'.) +%% Anyway or in certain cases, it may be better to keep a character +%% ``active" throughout a document and just to change the \emph{expansion} +%% of the ``active-character token." This can be done with +%% `\MakeActiveLet' and `\MakeActiveDef' in certain cases already. +%% E.g., when the \emph{``blank space"} has been ``activated" by +%% `\obeylines', `\MakeActiveLet\ \space' ``undoes" this half-way, +%% while it does not restore ``argument skipping" and +%% ``compressing blank spaces." +%% +%% When character <char> should be ``active" for some time, +%% but for certain moments you prefer that it behaves like an +%% ``other character", you can switch to its ``other" expansion by +%% |\MakeActiveOther\<char>|: +\gdef\MakeActiveOther#1{% + \MakeActiveAss\edef#1{\expandafter\@gobble\string#1}} +%% `\MakeActiveOther' uses \LaTeX's |\@gobble<arg>|, +%% \emph{without} \LaTeX, 'actcodes' provides it: +\ifltx\else \long\gdef\@gobble#1{} \fi +% \show_ \MakeActiveOther\_ \show_ \expandafter\show_ +%% I am \emph{not} providing a version \emph{without} +%% the `\catcode' change, although the latter is superfluous here +%% TODO ... +%% +%% `niceverb' also provides `\MakeNormal\<char>', it may migrate +%% to here in the future, and there may be |\MakeActiveNormal\<char>| +%% extending the above `\MakeActiveOther' TODO ... +%% +%% Also, a \emph{stack} might be used as in 'stacklet', +%% even to switch \emph{meanings} of active-character tokens ... +%% not sure TODO ... +%% +%% \ctanpkgref{babel} does similar things, but I never have ... TODO +%% +%% === Leaving and Version History === +\PopLetterCatAt +\endinput +%% +%% VERSION HISTORY + +v0.1 2012/08/26 started, almost completed + 2012/08/27 completed; realizing \Push...At ..., bug fixes +v0.2 2012/08/28 \global\let, \def -> \gdef + 2012/09/16 \MakeActive + 2012/09/19 doc: stacklet |