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%%
%% This is file `ltxnew.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% ltxnew.dtx (with options: `package')
%%
%% This is a generated file.
%%
%% ltxnew : provides the \new \renew and \provide prefixes for checking definitions.
%%
%% This work may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either
%% version 1.3 of this license or (at your option) any later
%% version. The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%%
%% This work consists of the main source file ltxnew.dtx
%% and the derived files
%% ltxnew.sty, ltxnew.pdf, ltxnew.ins,
%%
%% ltxnew : provides the \new \renew and \provide prefixes for checking definitions
%% Copyright (C) 2009 by Florent Chervet <florent.chervet@free.fr>
%%
\NeedsTeXFormat{LaTeX2e}% LaTeX 2.09 can't be used (nor non-LaTeX)
[2005/12/01]% LaTeX must be 2005/12/01 or younger (see kvsetkeys.dtx).
\ProvidesPackage{ltxnew}
[2009/10/11 v1.1 provides the new and renew prefixes for checking definitions]
\RequirePackage{etex}
% \ltxn@expandonce is the copy of \expandonce from etoolbox.sty
\def\ltxn@expandonce#1{\unexpanded\expandafter{#1}}
% This is the entry point of the prefixes scanner:
% The whole job is done by \futurelet
\def\ltxn@prefix{\begingroup
\newif\ifglobal
\let\ltxn@prfx\@empty
\let\ltxn@rubbish\relax
\futurelet\x\ltxn@@prefix}
% Here is the test macro: testing each prefix token one after another:
% It consists in a long list of \ifx
\def\ltxn@@prefix{%
\let\ltxn@next@addto\ltxn@next@prefix
\ifx\x\@sptoken \let\next\ltxn@space@prefix%%1
\else \let\next\ltxn@addto@prfx
\ifx\x\long \def\z{\long}%%2
\else\ifx\x\protected\def\z{\protected}%%3
\else\ifx\x\global \let\z\@empty\globaltrue%%4
\else\ifx\x\outer \def\z{\outer}%%5
\else
\ifx\x\expandafter \def\z{\expandafter}%%6
\else\ifx\x\noexpand \def\z{\noexpand}%%7
\else\ifx\x\relax \def\z{\relax}%%8
\else
\def\ltxn@next@addto{\expandafter\ltxn@def\noexpand}%
\ifx\x\let \def\z{\let}%%9
\let\ltxn@cancel\ltxn@cancel@let
\else \let\ltxn@cancel\ltxn@cancel@def
\ifx\x\def \edef\z{\ifglobal\global\fi\def}%%10
\else\ifx\x\edef \edef\z{\ifglobal\global\fi\edef}%%11
\else\ifx\x\gdef \def\z{\gdef}%%12
\else\ifx\x\xdef \def\z{\xdef}%%13
\else \let\ltxn@cancel\ltxn@cancel@new
\ifx\x\count \def\z{\newcount}%%14
\else\ifx\x\countdef%%15
\ifglobal\def\z{\globcount}\else\def\z{\loccount}\fi
\else\ifx\x\loccount%%16
\ifglobal\def\z{\globcount}\else\def\z{\loccount}\fi
\else\ifx\x\globcount \def\z{\globcount}%%17
\else\ifx\x\dimen \def\z{\newdimen}%%18
\else\ifx\x\dimendef%%19
\ifglobal\def\z{\globdimen}\else\def\z{\locdimen}\fi
\else\ifx\x\locdimen%%20
\ifglobal\def\z{\globdimen}\else\def\z{\locdimen}\fi
\else\ifx\x\globdimen \def\z{\globdimen}%%21
\else\ifx\x\skip \def\z{\newskip}%%22
\else\ifx\x\skipdef%%23
\ifglobal\def\z{\globskip}\else\def\z{\locskip}\fi
\else\ifx\x\locskip%%24
\ifglobal\def\z{\globskip}\else\def\z{\locskip}\fi
\else\ifx\x\globskip \def\z{\globskip}%%25
\else\ifx\x\muskip \def\z{\newmuskip}%%26
\else\ifx\x\muskipdef%%27
\ifglobal\def\z{\globmuskip}\else\def\z{\locmuskip}\fi
\else\ifx\x\locmuskip%%28
\ifglobal\def\z{\globmuskip}\else\def\z{\locmuskip}\fi
\else\ifx\x\globmuskip \def\z{\globmuskip}%%29
\else\ifx\x\savebox \def\z{\newsavebox}%%30
\else\ifx\x\box%%31
\ifglobal\def\z{\globbox}\else\def\z{\locbox}\fi
\else\ifx\x\locbox%%§32
\ifglobal\def\z{\globbox}\else\def\z{\locbox}\fi
\else\ifx\x\globbox \def\z{\globbox}%%33
\else\ifx\x\toksdef%%34
\ifglobal\def\z{\globtoks}\else\def\z{\loctoks}\fi
\else\ifx\x\toks \def\z{\newtoks}%%35
\else\ifx\x\loctoks%%36
\ifglobal\def\z{\globtoks}\else\def\z{\loctoks}\fi
\else\ifx\x\globtoks \def\z{\globtoks}%%37
\else\ifx\x\locmarks%%38
\ifglobal\def\z{\globmarks}\else\def\z{\locmarks}\fi
\else\ifx\x\marks \def\z{\newmarks}%%39 %\newmarks=\globmarks
\else\ifx\x\globmarks \def\z{\globmarks}%%40
\else\ifx\x\font \def\z{\font}%%41
\else\ifx\x\write \def\z{\newwrite}%%42
\else\ifx\x\read \def\z{\newread}%%43
\else\ifx\x\protect \ltxn@error@prefix%%44
\else
\let\ltxn@next@addto\ltxn@next@prefix
\ifx\y\x\ltxn@error@prefix
\else\let\y\x
\fi
\let\next\ltxn@expand@prefix
\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi
\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi
\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi
\fi\fi\fi\fi
\fi
\fi\fi\fi
\fi\fi\fi\fi% so many fees...
\fi\next}
\def\ltxn@next@prefix{\futurelet\x\ltxn@@prefix}
\def\ltxn@expand@prefix{%
\expandafter\futurelet\expandafter\x\expandafter\ltxn@@prefix}
\def\ltxn@addto@prfx#1{\let\y\@undefined
\edef\ltxn@prfx{\ltxn@expandonce{\ltxn@prfx}\ltxn@expandonce{\z}}%
\ltxn@next@addto}
\expandafter\def\expandafter\ltxn@space@prefix\space{\ltxn@next@prefix}
\def\ltxn@error@prefix{\@latex@error{A \string\def\space
(or \string\countdef\space or\string\toksdef\space etc.)\MessageBreak
was expected after \string\new\MessageBreak
I found a \meaning\x!\MessageBreak
see ltxnew documentation for more information}\@ehd}
% These are the macros used in case we have to cancel definition (nonstopmode)
% #1 is always the control sequence not to redefine
\def\ltxn@cancel@let{\afterassignment\endgroup\let\ltxn@rubbish}
\def\ltxn@cancel@def{\afterassignment\endgroup\def\ltxn@rubbish}
\def\ltxn@cancel@new{\endgroup}
% new: Do define or cancel, depending on the result of \@ifdefinable
\def\ltxn@new#1{%
\let\next\ltxn@cancel
\ifdefined#1\unless\ifx#1\relax\def#1{ltxn@throw@error}\fi\fi
\expandafter\@ifdefinable\noexpand#1{%
\expandafter\let\noexpand#1=\relax
\edef\next{\endgroup\ltxn@expandonce{\ltxn@prfx}\noexpand#1}}%
\next}
% renew: Throws an error in case the control sequence is unknown or \relax
\def\ltxn@renew#1{%
\edef\ltxn@name{\string#1 }%
\ifdefined#1 \ifx#1\relax \ltxn@error{renew: \ltxn@name undefined}\fi
\else \ltxn@error{renew: \ltxn@name undefined}%
\fi
\let#1=\relax
\def\next{\ltxn@new#1}%
\next}
% provide: Never throw an error but conditionally defines the control sequence
\def\ltxn@provide#1{%
\let\next\ltxn@cancel
\edef\ltxn@name{\string#1}%
\ifdefined#1 \ifx#1\relax \ltxn@provide@new\fi
\else \ltxn@provide@new
\fi
\next}
\def\ltxn@provide@new{%
\edef\next{\noexpand\ltxn@new\csname\expandafter\@gobble\ltxn@name\endcsname}}
% \new: the entry point:
% just let the definition macro to be \ltxn@new and start scanning prefixes.
\def\new{\let\ltxn@def\ltxn@new\ltxn@prefix}
% \renew: the entry point:
% just let the definition macro to be \ltxn@renew and start scanning prefixes.
\def\renew{\let\ltxn@def\ltxn@renew\ltxn@prefix}
% \provide: the entry point:
% just let the definition macro to be |\ltxn@provide| and start scanning prefixes.
\def\provide{\let\ltxn@def\ltxn@provide\ltxn@prefix}
% In case of redefinition, throws an |\ehc|-type error:
\def\ltxn@error#1{\@latex@error{#1}\@ehc}
\endinput
%%
%% End of file `ltxnew.sty'.
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