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1 % chngcntr.sty
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2 %
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3 % Provides commands to change the resetting of counters.
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4 % Instructions for use are at the end of this file.
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5 %
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6 % author: Peter Wilson (CUA)
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7 % (now at peter.r.wilson@boeing.com)
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8 % Released under the Latex Project Public License
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9 %
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10 %
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11 \NeedsTeXFormat{LaTeX2e}
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12 \ProvidesPackage{chngcntr}[2001/03/30 v1.0 change counter resetting]
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13 %
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14 % This package uses David Carlisle's \@removefromreset command as
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15 % specified in the remreset package available from CTAN as
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16 % macros/latex/contrib/supported/carlisle/remreset.sty
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17 % It is \provided here as a convenience to the user, and with
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18 % David Carlisle's permission.
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19 % START OF DAVID CARLISLE'S CODE
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20 \providecommand{\@removefromreset}[2]{{%
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21 \expandafter\let\csname c@#1\endcsname\@removefromreset
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22 \def\@elt##1{%
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23 \expandafter\ifx\csname c@##1\endcsname\@removefromreset
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24 \else
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25 \noexpand\@elt{##1}%
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26 \fi}%
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27 \expandafter\xdef\csname cl@#2\endcsname{%
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28 \csname cl@#2\endcsname}}}
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29 % END OF DAVID CARLISLE'S CODE
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30
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31 %%\@ifbothc@t@s{<package>}{<counter>}{<within>}{<code when both are counters>}
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32 \newcommand{\@ifbothc@t@s}[4]{%
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33 \@ifundefined{c@#2}{% counter undefined
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34 \PackageError{#1}{#2 is not a counter}{\@eha}}%
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35 {% else counter is defined
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36 \@ifundefined{c@#3}{% within undefined
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37 \PackageError{#1}{#3 is not a counter}{\@eha}}%
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38 {% else both counter and within are defined
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39 #4}}}
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40
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41 %%\counterwithout*{<counter>}{<within>}
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42 \newcommand{\counterwithout}{\@ifstar{\c@t@soutstar}{\c@t@sout}}
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43 \newcommand{\c@t@soutstar}[2]{%
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44 \@ifbothc@t@s{chngcntr}{#1}{#2}{\@removefromreset{#1}{#2}}}
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45 \newcommand{\c@t@sout}[2]{%
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46 \@ifbothc@t@s{chngcntr}{#1}{#2}{\@removefromreset{#1}{#2}%
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47 \@namedef{the#1}{\arabic{#1}}}}
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48
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49
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50 %%\counterwithin*{<counter>}{<within>}
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51 \newcommand{\counterwithin}{\@ifstar{\c@t@sinstar}{\c@t@sin}}
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52 \newcommand{\c@t@sinstar}[2]{%
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53 \@ifbothc@t@s{chngcntr}{#1}{#2}{\@addtoreset{#1}{#2}}}
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54 \newcommand{\c@t@sin}[2]{%
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55 \@ifbothc@t@s{chngcntr}{#1}{#2}{\@addtoreset{#1}{#2}%
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56 \@namedef{the#1}{\@nameuse{the#2}.\arabic{#1}}}}
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57
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58
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59 \endinput
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60
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61 %%%%%%%%%%%%%%%%%%
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62 % USAGE
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63 %%%%%%%%%%%%%%%%%%
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64 %
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65 % In LaTeX, a new counter called, say `ctr', is created by the command
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66 % \newcounter{ctr}[within]. If the optional within argument is given
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67 % the the counter `ctr' is reset to zero each time the counter `within'
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68 % changes. The command \thectr typesets the value of the counter ctr.
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69 % This is automatically defined by \newcounter and is initialised
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70 % to typeset arabic numerals.
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71 %
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72 %%%%%%%%%%%%%%%%%
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73 % \counterwithin
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74 % \counterwithin*
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75 %%%%%%%%%%%%%%%%%
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76 % It is sometimes desireable to change a counter that has been defined
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77 % by \newcounter{ctr} to act as though it had been defined as
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78 % \newcounter{ctr}[within]. The package provides the command
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79 % \counterwithin{ctr}{within} that accomplishes this. By default,
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80 % it also redefines the \thectr command so that it typesets values
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81 % in the style \thewithin.\arabic{ctr}. The starred version of the
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82 % command suppresses the redefinition of \thectr
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83 % (e.g., \counterwithin*{ctr}{within}).
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84 %
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85 %%%%%%%%%%%%%%%%%%
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86 % \counterwithout
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87 % \counterwithout*
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88 %%%%%%%%%%%%%%%%%%
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89 % Likewise, the command \counterwithout{ctr}{within} changes a
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90 % counter that has been created by \newcounter{ctr}[within] to act
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91 % as though it had been created by \newcounter{ctr}. By default it
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92 % also redefines the \thectr command so that it just typesets an arabic
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93 % numeral. The starred version of the command suppresses the redefinition
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94 % of \thectr.
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95 %
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96 % Any number of \counterwithin{ctr}{...} and \counterwithout{ctr}{...}
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97 % commands can be issued for a given counter, ctr, if you wish to toggle
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98 % between the two styles. The current value of ctr is unaffected by
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99 % \counterwithin and \counterwithout. If you want to change the value
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100 % after one of these commands, use \setcounter{ctr}{...}, and to change
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101 % the typeseting style use \renewcommand{\thectr}{...}.
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102 %
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103 %
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104 % Peter W.
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105 % 2001/03/30
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106 %
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107
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