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-% $Id: elatex.sty,v 1.1 2007/05/28 15:16:54 lehman stable $
-
-% Copyright (c) 2007 Philipp Lehman, author-maintained.
-%
-% Permission is granted to copy, distribute and/or modify this
-% software under the terms of the LaTeX Project Public License
-% (LPPL), version 1.3.
-%
-% This software is provided `as is', without warranty of any kind,
-% either expressed or implied, including, but not limited to, the
-% implied warranties of merchantability and fitness for a particular
-% purpose.
-
-\NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{elatex}[2007/05/28 v1.1 e-TeX tools for LaTeX]
-
-\begingroup
-\@ifundefined{eTeXversion}
- {\PackageError{elatex}
- {Not running under e-TeX}
- {This package requires e-TeX. Try compiling the document
- with\MessageBreak `elatex' instead of `latex'. When using
- pdfTeX, try `pdfelatex'\MessageBreak instead of `pdflatex'}%
- \aftergroup\endinput}
- {}
-\endgroup
-
-\RequirePackage{etex}
-
-\edef\elx@catcodes{\catcode\number`\&=\the\catcode`\&\relax}
-\catcode`\&=3
-
-\AtEndOfPackage{%
- \elx@catcodes
- \let\elx@catcodes\@undefined}
-
-% {<cstoken>}[<arguments>][<optarg default>]{<definition>}
-
-\newcommand*{\newrobustcmd}{}
-\protected\def\newrobustcmd{%
- \@ifstar
- {\let\l@ngrel@x\protected\elx@new@command}
- {\def\l@ngrel@x{\protected\long}\elx@new@command}}
-
-\def\elx@new@command#1{\@testopt{\elx@newcommand#1}0}
-\def\elx@newcommand#1[#2]{%
- \@ifnextchar[%]
- {\elx@xargdef#1[#2]}
- {\@argdef#1[#2]}}
-\long\def\elx@xargdef#1[#2][#3]#4{%
- \@ifdefinable#1{%
- \expandafter\protected
- \expandafter\def
- \expandafter#1%
- \expandafter{%
- \expandafter\@testopt
- \csname\string#1\endcsname{#3}}%
- \expandafter\@yargdef
- \csname\string#1\endcsname\tw@{#2}{#4}}}
-
-% {<cstoken>}[<arguments>][<optarg default>]{<definition>}
-
-\newrobustcmd*{\renewrobustcmd}{%
- \@ifstar
- {\let\l@ngrel@x\protected\elx@renew@command}
- {\def\l@ngrel@x{\protected\long}\elx@renew@command}}
-
-\def\elx@renew@command#1{%
- \begingroup
- \escapechar\m@ne
- \xdef\@gtempa{{\string#1}}%
- \endgroup
- \expandafter\@ifundefined\@gtempa
- {\@latex@error{\noexpand#1undefined}\@ehc}
- {}%
- \let\@ifdefinable\@rc@ifdefinable
- \elx@new@command#1}
-
-% {<cstoken>}[<arguments>][<optarg default>]{<definition>}
-
-\newrobustcmd*{\providerobustcmd}{%
- \@ifstar
- {\let\l@ngrel@x\protected\elx@provide@command}
- {\def\l@ngrel@x{\protected\long}\elx@provide@command}}
-
-\def\elx@provide@command#1{%
- \begingroup
- \escapechar\m@ne
- \xdef\@gtempa{{\string#1}}%
- \endgroup
- \expandafter\@ifundefined\@gtempa
- {\def\reserved@a{\elx@new@command#1}}
- {\def\reserved@a{\elx@renew@command\reserved@a}}%
- \reserved@a}%
-
-% {<cstoken>}
-
-\@onlypreamble\robustify
-\newrobustcmd*{\robustify}[1]{%
- \ifundef#1%
- {\@latex@error{\string#1 undefined}\@ehc}
- {\begingroup
- \edef\elx@resrvda{\meaning#1}%
- \edef\elx@resrvdb{%
- \noexpand\protect\expandafter\noexpand
- \csname\expandafter\@gobble\string#1 \endcsname}%
- \edef\elx@resrvdb{\meaning\elx@resrvdb}%
- \ifx\elx@resrvda\elx@resrvdb
- \letcs#1{\expandafter\@gobble\string#1 }%
- \cslet{\expandafter\@gobble\string#1 }\@undefined
- \fi
- \edef\elx@resrvda{%
- \def\noexpand\elx@resrvda####1\detokenize{macro:}####2->####3&{%
- \protected####1\def\detokenize{#1}####2{####3}}%
- \edef\noexpand\elx@resrvda{%
- \noexpand\elx@resrvda\meaning#1&}}%
- \elx@resrvda
- \elx@scantoks\endgroup\elx@resrvda}}
-
-% {<cstoken>}{<true>}{<false>}
-
-\newcommand*{\ifdef}[1]{%
- \ifdefined#1%
- \expandafter\@firstoftwo
- \else
- \expandafter\@secondoftwo
- \fi}
-
-% {<cstoken>}{<true>}{<false>}
-
-\newcommand*{\ifundef}[1]{%
- \ifdefined#1%
- \ifx#1\relax
- \expandafter\expandafter
- \expandafter\@firstoftwo
- \else
- \expandafter\expandafter
- \expandafter\@secondoftwo
- \fi
- \else
- \expandafter\@firstoftwo
- \fi}
-
-% {<csname>}{<true>}{<false>}
-
-\newcommand*{\ifcsdef}[1]{%
- \ifcsname#1\endcsname
- \expandafter\@firstoftwo
- \else
- \expandafter\@secondoftwo
- \fi}
-
-% {<csname>}{<true>}{<false>}
-
-\newcommand*{\ifcsundef}[1]{%
- \ifcsname#1\endcsname
- \expandafter\ifx\csname#1\endcsname\relax
- \expandafter\expandafter
- \expandafter\@firstoftwo
- \else
- \expandafter\expandafter
- \expandafter\@secondoftwo
- \fi
- \else
- \expandafter\@firstoftwo
- \fi}
-
-% {<string>}{<true>}{<false>}
-
-\newcommand{\ifblank}[1]{% from url.sty
- \elx@ifblank@i#1&&\@secondoftwo\@firstoftwo:}
-\long\def\elx@ifblank@i#1#2&#3#4#5:{#4}
-
-% {<cstoken>}{<search>}{<true}{<false>}
-
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- \begingroup
- \@makeother\#%
- \elx@ifpatchable}
-
-\def\elx@ifpatchable#1#2{%
- \endgroup
- \ifundef{#1}
- {\@firstoftwo}
- {\begingroup
- \edef\elx@resrvda{%
- \def\noexpand\elx@resrvda####1->####2&{%
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- \def\noexpand\elx@resrvdb####1\detokenize{#2}####2&{%
- \endgroup\noexpand\noexpand\noexpand\ifblank{####2}}%
- \edef\noexpand\elx@resrvda{%
- \noexpand\elx@resrvda\meaning#1&}%
- \noexpand\elx@resrvda}%
- \elx@resrvda}
- {\@secondoftwo}
- {\@firstoftwo}}
-
-% [<prefix>]{<cstoken>}{<search>}{<replace>}{<success>}{<failure>}
-
-\@onlypreamble\patchcommand
-\newrobustcmd*{\patchcommand}{%
- \begingroup
- \@makeother\#%
- \elx@patchcmd}
-
-\newcommand{\elx@patchcmd}[4][########1]{%
- \elx@ifpatchable{#2}{#3}
- {\begingroup
- \edef\elx@resrvda{%
- \def\noexpand\elx@resrvda####1\detokenize{macro:}####2->####3&{%
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- \def\noexpand\elx@resrvdb####1\detokenize{#3}####2&{%
- ####1\detokenize{#4}####2}%
- \edef\noexpand\elx@resrvda{%
- \noexpand\elx@resrvda\meaning#2&}}%
- \elx@resrvda
- \elx@scantoks\endgroup\elx@resrvda
- \@firstoftwo}
- {\@secondoftwo}}
-
-\def\elx@scantoks#1#2{%
- \begingroup
- \edef\elx@resrvda{\endgroup
- \unexpanded{#1\makeatletter\scantokens}{#2}%
- \catcode\number`\@=\the\catcode`\@\relax}%
- \elx@resrvda}
-
-% {<cstoken>}{<code>}
-
-\@onlypreamble\apptocommand
-\newrobustcmd*{\apptocommand}{%
- \begingroup
- \@makeother\#%
- \elx@hooktocmd\elx@apptocmd}
-
-\@onlypreamble\pretocommand
-\newrobustcmd*{\pretocommand}{%
- \begingroup
- \@makeother\#%
- \elx@hooktocmd\elx@pretocmd}
-
-\long\def\elx@hooktocmd#1#2#3{%
- \endgroup
- \ifundef{#2}
- {\def#2{#3}}
- {\begingroup
- \edef\elx@resrvda{%
- \def\noexpand\elx@resrvda####1\detokenize{macro:}####2->####3&{%
- ####1\def\detokenize{#2}####2{#1{####3}{\detokenize{#3}}}}%
- \edef\noexpand\elx@resrvda{%
- \noexpand\elx@resrvda\meaning#2&}}%
- \elx@resrvda
- \elx@scantoks\endgroup\elx@resrvda}}
-
-\long\def\elx@apptocmd#1#2{#1#2}
-\long\def\elx@pretocmd#1#2{#2#1}
-
-% {<cstoken>}
-
-\newcommand*{\expandonce}[1]{%
- \unexpanded\expandafter{#1}}
-
-% {<csname>}
-
-\newcommand*{\csexpandonce}[1]{%
- \expandafter\expandonce\csname #1\endcsname}
-
-% {<code>}
-
-\newcommand*{\protecting}{}
-\def\protecting#{%
- \ifx\protect\@typeset@protect
- \elx@protecting\@firstofone
- \fi
- \ifx\protect\@unexpandable@protect
- \elx@protecting\elx@unexpandable
- \fi
- \ifx\protect\noexpand
- \elx@protecting\unexpanded
- \fi
- \ifx\protect\string
- \elx@protecting\detokenize
- \fi
- \relax\@firstofone}
-
-\def\elx@protecting#1#2\relax\@firstofone{\fi#1}
-\long\def\elx@unexpandable#1{\unexpanded{\protecting{#1}}}
-
-% {<csname>}
-
-\newrobustcmd*{\csdef}[1]{\expandafter\def\csname#1\endcsname}
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-\newrobustcmd*{\protected@csedef}{\elx@protected\csedef}
-\newrobustcmd*{\protected@csxdef}{\elx@protected\csxdef}
-
-\def\elx@protected{%
- \let\@@protect\protect
- \let\protect\@unexpandable@protect
- \afterassignment\restore@protect}
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-% {<csname>}{<cstoken>}
-
-\newrobustcmd*{\cslet}[2]{\expandafter\let\csname#1\endcsname#2}
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-% {<cstoken>}{<csname>}
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-% {<csname>}{<csname>}
-
-\newrobustcmd*{\csletcs}[1]{\expandafter\letcs\csname#1\endcsname}
-
-% {<csname>}
-
-\newcommand*{\csuse}[1]{%
- \ifcsname#1\endcsname
- \csname#1\expandafter\endcsname
- \fi}
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-% {<cstoken>}{<code>}
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-\newrobustcmd{\appto}[2]{%
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-
-\newrobustcmd*{\protected@eappto}{\elx@protected\eappto}
-\newrobustcmd*{\protected@xappto}{\elx@protected\xappto}
-
-% {<cstoken>}{<code>}
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-
-\newrobustcmd*{\protected@epreto}{\elx@protected\epreto}
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-% {<csname>}{<code>}
-
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-% {<csname>}{<code>}
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