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%% This file contains the ntabbing.sty
%% Written by Gideon Stupp stupp@math.tau.ac.il
%%
%% The ntabbing environment is an extension of the tabbing environment.
%% Two commands added:
%% \label{} - enumerates the and gives
%% a reference to the line just like any \label operation.
%%
%% \reset - Resets line numbering.
%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{ntabbing}[2000/03/20 v2.0 tabbing enhancements]
\newcounter{g@linecounter}
\newbox\g@numbox%
\newdimen\numboxsize \numboxsize=1.5em%
\newbox\g@seperator \setbox\g@seperator=\hbox{:}
\gdef\g@setnumbox{
\refstepcounter{g@linecounter}%
\global\setbox\g@numbox=\hbox to\numboxsize{\hfil \theg@linecounter\copy\g@seperator\hfil }
}
% newlabel increments counter and set numbox. Empty labels are not passed to old label.
\gdef\g@newlabel#1{\g@setnumbox\ifx#1\@empty\else\g@oldlabel{#1}\fi}
% Change tabbing startline to give empty default value to numbox
\gdef\g@newstartline{\global\setbox\g@numbox=\hbox to\numboxsize{}
\g@oldstartline}
% Change tabbing stopline to print numbox before current line.
\gdef\g@newstopline{\unskip\@stopfield\if@rjfield
\global\@rjfieldfalse
\@tempdima\@totalleftmargin \advance\@tempdima\linewidth
\hb@xt@\@tempdima{\@itemfudge\box\g@numbox\hskip\dimen\@curtabmar
\box\@curline\hfil\box\@curfield}\else\@addfield
\hbox{\@itemfudge\box\g@numbox\hskip\dimen\@curtabmar\box\@curline}\fi}
%ntabbing environment definition.
\def\ntabbing{
\def\reset{\setcounter{g@linecounter}{0}}
\let\g@oldstopline=\@stopline
\let\@stopline=\g@newstopline
\let\g@oldstartline=\@startline
\let\@startline=\g@newstartline
\let\g@oldlabel=\label
\let\label=\g@newlabel
\let\g@oldcaption=\caption
% redefine \caption{} to support the old \label
\def\caption##1{\let\label=\g@oldlabel \g@oldcaption{##1}}
\tabbing
} % Of ntabbing.
\def\endntabbing {\endtabbing}
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