From 587bb7e9ffc42cc55c9154d8047f5cfef1de9471 Mon Sep 17 00:00:00 2001 From: Karl Berry Date: Wed, 23 Jan 2019 21:29:45 +0000 Subject: globalvals (23jan19) git-svn-id: svn://tug.org/texlive/trunk@49802 c570f23f-e606-0410-a88d-b1316a301751 --- .../texmf-dist/tex/latex/globalvals/globalvals.sty | 62 ++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 Master/texmf-dist/tex/latex/globalvals/globalvals.sty (limited to 'Master/texmf-dist/tex/latex/globalvals') diff --git a/Master/texmf-dist/tex/latex/globalvals/globalvals.sty b/Master/texmf-dist/tex/latex/globalvals/globalvals.sty new file mode 100644 index 00000000000..48b99ded28c --- /dev/null +++ b/Master/texmf-dist/tex/latex/globalvals/globalvals.sty @@ -0,0 +1,62 @@ +% Global Vars + +% (c) Charles Baynham 2019 + +% License: LaTeX Project Public License 1.3c + +% % This program can be redistributed and/or modified under the terms +% % of the LaTeX Project Public License Distributed from CTAN archives +% % in directory macros/latex/base/lppl.txt. + +% This package allow the user to declare a variable which can then be used +% anywhere else in a document, including before it was declared. This is done +% by putting the definitions into the .aux files, therefore requiring two runs +% to get it right. + +% It implements two commands: \defVal{} and \useVal{}. \defVal +% sets up a global variable and \useVal recalls it. + +% Using \defVal twice will result in an error. Using \useVal for an undefined +% value will output the text "??" +% +\makeatletter +\NeedsTeXFormat{LaTeX2e} +\def\@globalvalsPkgName{globalvals} +\ProvidesPackage{\@globalvalsPkgName} + [2019/01/23 v1.0 Define and use global variables throughout a document, including before their definition] + + + +% useVal@#1 will hold the value of the variable: it's defined by an .aux file +% somewhere +\newcommand{\useVal}[1]{% + \ifcsname useVal@#1\endcsname + \csname useVal@#1\endcsname + \else + ??% + \PackageWarning{\@globalvalsPkgName}{Value "#1" has not yet been defined. This may be fine, you may need to recompile. If you keep getting this message it's because you haven't defined it yet. } + \fi +} + +% useVal@#1 is defined in the .aux file to be used on the next run. +% useVal@#1@defined is defined immediately to mark that useVal@#1 has already +% been used and cannot be used again +\newcommand{\defVal}[2]{% +\ifcsname useVal@#1@defined\endcsname + \PackageError{\@globalvalsPkgName}{Value "#1" already defined}% + {You have two defVal commands which have the same parameter name. This error is occurring on the 2nd (or 3rd, or 4th...).}% +\else% + \write\@auxout{% + \unexpanded{\global\@namedef{useVal@#1}{#2}}% + }% + \global\@namedef{useVal@#1@defined}{}% + \global\@namedef{useVal@#1}{#2}% + \PackageInfo{\@globalvalsPkgName}{Defining new variable "#1" with value "#2"}% +\fi% +} + +\makeatother + +\endinput +%% +%% End of file `globalvals.sty'. \ No newline at end of file -- cgit v1.2.3