111 lines
4 KiB
TeX
111 lines
4 KiB
TeX
% chngcntr.sty
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%
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% Provides commands to change the resetting of counters.
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% Instructions for use are at the end of this file.
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%
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% Author: Peter Wilson, Herries Press
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% Maintainer: Will Robertson (will dot robertson at latex-project dot org)
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% Released under the Latex Project Public License
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%
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%
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\NeedsTeXFormat{LaTeX2e}
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\ProvidesPackage{chngcntr}[2009/09/02 v1.0a change counter resetting]
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%
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% This package uses David Carlisle's \@removefromreset command as
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% specified in the remreset package available from CTAN as
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% macros/latex/contrib/supported/carlisle/remreset.sty
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% It is \provided here as a convenience to the user, and with
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% David Carlisle's permission.
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% START OF DAVID CARLISLE'S CODE
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\providecommand{\@removefromreset}[2]{{%
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\expandafter\let\csname c@#1\endcsname\@removefromreset
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\def\@elt##1{%
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\expandafter\ifx\csname c@##1\endcsname\@removefromreset
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\else
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\noexpand\@elt{##1}%
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\fi}%
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\expandafter\xdef\csname cl@#2\endcsname{%
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\csname cl@#2\endcsname}}}
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% END OF DAVID CARLISLE'S CODE
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%%\@ifbothc@t@s{<package>}{<counter>}{<within>}{<code when both are counters>}
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\newcommand{\@ifbothc@t@s}[4]{%
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\@ifundefined{c@#2}{% counter undefined
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\PackageError{#1}{#2 is not a counter}{\@eha}}%
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{% else counter is defined
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\@ifundefined{c@#3}{% within undefined
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\PackageError{#1}{#3 is not a counter}{\@eha}}%
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{% else both counter and within are defined
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#4}}}
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%%\counterwithout*{<counter>}{<within>}
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\newcommand{\counterwithout}{\@ifstar{\c@t@soutstar}{\c@t@sout}}
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\newcommand{\c@t@soutstar}[2]{%
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\@ifbothc@t@s{chngcntr}{#1}{#2}{\@removefromreset{#1}{#2}}}
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\newcommand{\c@t@sout}[2]{%
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\@ifbothc@t@s{chngcntr}{#1}{#2}{\@removefromreset{#1}{#2}%
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\@namedef{the#1}{\arabic{#1}}}}
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%%\counterwithin*{<counter>}{<within>}
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\newcommand{\counterwithin}{\@ifstar{\c@t@sinstar}{\c@t@sin}}
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\newcommand{\c@t@sinstar}[2]{%
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\@ifbothc@t@s{chngcntr}{#1}{#2}{\@addtoreset{#1}{#2}}}
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\newcommand{\c@t@sin}[2]{%
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\@ifbothc@t@s{chngcntr}{#1}{#2}{\@addtoreset{#1}{#2}%
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\@namedef{the#1}{\@nameuse{the#2}.\arabic{#1}}}}
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\endinput
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%%%%%%%%%%%%%%%%%%
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% USAGE
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%%%%%%%%%%%%%%%%%%
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%
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% In LaTeX, a new counter called, say `ctr', is created by the command
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% \newcounter{ctr}[within]. If the optional within argument is given
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% the the counter `ctr' is reset to zero each time the counter `within'
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% changes. The command \thectr typesets the value of the counter ctr.
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% This is automatically defined by \newcounter and is initialised
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% to typeset arabic numerals.
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%
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%%%%%%%%%%%%%%%%%
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% \counterwithin
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% \counterwithin*
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%%%%%%%%%%%%%%%%%
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% It is sometimes desireable to change a counter that has been defined
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% by \newcounter{ctr} to act as though it had been defined as
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% \newcounter{ctr}[within]. The package provides the command
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% \counterwithin{ctr}{within} that accomplishes this. By default,
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% it also redefines the \thectr command so that it typesets values
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% in the style \thewithin.\arabic{ctr}. The starred version of the
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% command suppresses the redefinition of \thectr
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% (e.g., \counterwithin*{ctr}{within}).
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%
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%%%%%%%%%%%%%%%%%%
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% \counterwithout
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% \counterwithout*
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%%%%%%%%%%%%%%%%%%
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% Likewise, the command \counterwithout{ctr}{within} changes a
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% counter that has been created by \newcounter{ctr}[within] to act
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% as though it had been created by \newcounter{ctr}. By default it
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% also redefines the \thectr command so that it just typesets an arabic
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% numeral. The starred version of the command suppresses the redefinition
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% of \thectr.
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%
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% Any number of \counterwithin{ctr}{...} and \counterwithout{ctr}{...}
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% commands can be issued for a given counter, ctr, if you wish to toggle
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% between the two styles. The current value of ctr is unaffected by
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% \counterwithin and \counterwithout. If you want to change the value
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% after one of these commands, use \setcounter{ctr}{...}, and to change
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% the typeseting style use \renewcommand{\thectr}{...}.
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%
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%
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% Peter W.
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% 2001/03/30
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%
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% Change History:
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% v1.0a - New maintainer (Will Robertson)
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%
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