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%
% laemu.sty -- helper TeX macros and LaTeX emulation for plain TeX + LaTeX
% by pts@fazekas.hu at Fri Jan 24 11:14:34 CET 2003
%
% To use this package from LaTeX, type
%
% \usepackage{laemu}
%
% To use this package from either LaTeX, plain TeX or AMSTeX, type
%
% \input laemu.sty
%
% As an alternative, the following solution will open laemu.sty only once:
%
% \expandafter\ifx\csname usepackage\endcsname\relax%
% \def\usepackage#1{\input#1.sty\relax}\fi%
% \usepackage{laemu}
% % this ensures that laemu.sty won't be loaded twice
%
% Tho use further packages from any TeX formats, type
%
% \usepackage{...PACKAGENAME...}
%
% vvv Don't load laemu.sty more than once
\expandafter\ifx\csname ifLaTeX\endcsname\relax\else\expandafter\endinput\fi
\newif\ifWasLetter% false
\ifnum\the\catcode`\@=\the\catcode`\a\relax\WasLettertrue\fi%
\catcode`\@=11% early \makeatletter
%** Are we running a real LaTeX?
\newif\ifLaTeX% default to false
%** Sets \ifLaTeX to (#1 == 'L' && #2 == 'a')
\def\@@setlatex#1#2#3\end{%
\if#1L\if#2a\LaTeXtrue\else\LaTeXfalse\fi\fi%
}%
% Dat: \fmtname is "plain", "LaTeX2e" or "AmS-TeX"
\expandafter\@@setlatex\fmtname\end%
\ifLaTeX%
%\PackageError{laemu}{alma}\@ehc
%** Calls #1{...}, where ... is the comma-separated option list for the
%** current package.
%** Arranges that these options won't be found at \endinput
%** Example: \LaemuProcessOptions\errmessage
%** @param #1 a \cs
\def\LaemuProcessOptions#1{%
\edef\reserved@a{\noexpand#1{\@ptionlist{\@currname.\@currext}}}%
\reserved@a
\AtEndOfPackage{\def\@unprocessedoptions{}}%
}%
\else%
\expandafter\let\csname opt@laemu.sty\endcsname\@empty% loaded ourselves
\long\def\@gobble#1{}%
\def\@ehc{No help here.}%
\newlinechar=`\^^J%
\def\on@line{ in line \the\inputlineno}% so it can be \@gobble-d
\def\NeedsTeXFormat#1{}% ignore
\def\ProvidesPackage#1#2[#3]{\makeatletter}% so `\input MYPKG.sty' works
% Dat: use \MessageBreak to separate error/warning/info lines
\def\PackageWarning#1#2{% Imp: robust
\def\MessageBreak{^^Jw: (#1) }%
% vvv Dat: line number refers to place of the \PackageWarning invocation
\immediate\write16{^^JPackage #1 Warning: #2\on@line.^^J}%
}%
\def\PackageInfo#1#2{% Imp: robust
\def\MessageBreak{^^Ji: (#1) }%
% vvv Dat: line number refers to place of the \PackageWarning invocation
\immediate\write-1{Package #1 Info: #2\on@line.}%
}%
\def\PackageError#1#2#3{\begingroup% Imp: robust
% Dat: real LaTeX \GenericError doesn't print stupid macro expansions
% after the error message. We cannot emulate it here, possibly because it
% this \PackageError should have been put into the format file (??)
\immediate\write16{}% an empty line
\def\MessageBreak{^^J!: (#1) }%
% vvv Dat: line number refers to place of the \PackageWarning invocation
\edef\@err@{{Package #1 Error: #2\MessageBreak#3}}%
\errhelp\@err@%
%\let\@err@\empty%
\errmessage{Package #1 Error: #2^^J!, See the package #1 docs for explanation}%
%~%
\endgroup}%
%
%** `\RequirePackage{package}' loads package.sty unless already loaded
%** `\RequirePackage[option]{package}'
%** `\RequirePackage[option1,option2,option3]{package}'
\def\RequirePackage{%
% Imp: allow optional arguments
% Imp: show a warning of loading with different arguments
\@ifnextchar[%]
{\@@RequirePackage@lowa}%
{\@@RequirePackage@lowa[]}%
}%
\def\@@RequirePackage@lowa[#1]#2{%
% Imp: add/strip ".sty" from end of #1
\@@RequirePackage@lowb{#2.sty}{#1}%
}%
%** {current.sty}{lower.sty}....%
\def\@@laemu@packagestack{.}% Imp: save \catcode64
%** \def#1{...}, where ... is the current package filename
\def\@@laemu@packagetop#1{%
%\message{T(\@@laemu@packagestack)}%
\expandafter\@@laemu@packagetop@low\@@laemu@packagestack#1%
}%
\def\@@laemu@packagetop@low#1#2.#3{%
% Dat: #2 is invalid now (braces may be stripped), don't use it
\def#3{#1}%
}%
\def\@@laemu@packagepop{% Imp: error on underflow
%\message{P(\@@laemu@packagestack)}%
\global\edef\@@laemu@packagestack{\expandafter\@gobble\@@laemu@packagestack}%
%\expandafter\@@laemu@packagepop@low\@@laemu@packagestack% doesn't work well
}%
%\def\@@laemu@packagepop@low#1#2.{% SUXX: removes brace from {y} in {x}{y}.
% \message{Q(#1,#2)}%
% \global\edef\@@laemu@packagestack{#2.}%
% \message{R(\@@laemu@packagestack)}%
%}%
\def\@@laemu@packagepush#1{%
\global\edef\@@laemu@packagestack{{#1}\@@laemu@packagestack}%
%\message{E(\@@laemu@packagestack)}%
}%
%** @param #1 filename with `.sty'
%** @param #2 options
\def\@@RequirePackage@lowb#1#2{%
\expandafter\ifx\csname opt@#1\endcsname\relax%
\expandafter\def\csname opt@#1\endcsname{#2}%
%\ifcat \noexpand @\noexpand a%
\@@laemu@packagepush{#1}%
\ifnum\the\catcode`\@=\the\catcode`\a\relax% Dat: \ifcat is wrong, because we need the _current_ value (at the time of execution)
\input#1\relax%
\else%
\makeatletter%
\input#1\relax%
\makeatother%
\fi%
\@@laemu@packagepop%
\else% package already loaded -- verify options
\def\reserved@a{#2}%
% Imp: allow \usepackage[a,b]{c} and \usepackage[b,a]{c}
% Dat: LaTeX \def's comma-separated-values to \csname opt@graphic.p.sty\endcsname
\expandafter\ifx\csname opt@#1\endcsname\reserved@a\else%
\PackageError{laemu}{Option clash for package file `#1'}{%
Old options: \csname opt@#1\endcsname\MessageBreak%
New options: \reserved@a
}%
\fi%
\let\reserved@a\@empty
\fi%
}%
\let\usepackage\RequirePackage%
% vvv see full comment above
\def\LaemuProcessOptions#1{%
\@@laemu@packagetop\reserved@a%
\edef\reserved@a{\noexpand#1{\csname opt@\reserved@a\endcsname}}%
\reserved@a
}%
%
\def\makeatletter{\catcode`\@11\relax}%
\def\makeatother{\catcode`\@12\relax}%
\def\@empty{}% not needed for LaTeX, needed for plain TeX
\long\def\@secondoftwo#1#2{#2}%
\def\@namedef#1{\expandafter\def\csname #1\endcsname}%
\def\@nameuse#1{\csname #1\endcsname}%
\expandafter\ifx\csname @ne\endcsname\relax \chardef\@ne=1\fi%
%
\long\def\@ifnextchar#1#2#3{%
\let\reserved@d=#1%
\def\reserved@a{#2}%
\def\reserved@b{#3}%
\futurelet\@let@token\@ifnch}
\def\@ifnch{%
\ifx\@let@token\@sptoken
\let\reserved@c\@xifnch
\else
\ifx\@let@token\reserved@d
\let\reserved@c\reserved@a
\else
\let\reserved@c\reserved@b
\fi
\fi
\reserved@c}
\def\:{\let\@sptoken= } \: % this makes \@sptoken a space token
\def\:{\@xifnch} \expandafter\def\: {\futurelet\@let@token\@ifnch}%
\expandafter\ifx\csname @inputcheck\endcsname\relax%
\newread\@inputcheck%
\fi%
\fi%
%** \input's a file if it exists
%** @param #1 filename
\def\LaemuInputQuiet#1{%
\openin\@inputcheck#1 %
\ifeof\@inputcheck\else%
\closein\@inputcheck%
\input#1 %
\fi
}%
%\PackageWarning{laemu}{alma\MessageBreak korte}
%\PackageInfo{laemu}{ialma\MessageBreak korte}
%\PackageError{laemu}{ialma\MessageBreak korte}\@ehc
\ifWasLetter\else\makeatother\fi%
|
