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% \iffalse meta-comment
%
% Template : look for attr DATE DESC VERSION !!!
% and 'derived files' !!!
%
% Written in 2009, 2010 by Manuel Pégourié-Gonnard and Élie Roux.
% <mpg@elzevir.fr>
% <elie.roux@telecom-bretagne.eu>
%
% This work is under the CC0 license.
%
% This work consists of the main source file luatexbase-attr.dtx
% and the derived files
% luatexbase-attr.sty luatexbase.attr.lua ...
%
% Unpacking:
% tex luatexbase-attr.dtx
% Documentation:
% pdflatex luatexbase-attr.dtx
%
%<*ignore>
\begingroup
\def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase 0\ifx\install y1\fi\expandafter
\ifx\csname processbatchFile\endcsname\relax\else1\fi
\ifx\fmtname\x\else 1\fi\relax
\else\csname fi\endcsname
%</ignore>
%<*install>
\input docstrip.tex
\keepsilent
\askforoverwritefalse
\let\MetaPrefix\relax
\preamble
This is a generated file.
Written in 2009, 2010 by Manuel Pégourié-Gonnard and Élie Roux.
<mpg@elzevir.fr>
<elie.roux@telecom-bretagne.eu>
This work is under the CC0 license.
This work consists of the main source file luatexbase-attr.dtx
and the derived files
luatexbase-attr.sty luatexbase.attr.lua ...
\endpreamble
\let\MetaPrefix\DoubleperCent
\generate{%
\usedir{tex/luatex/luatexbase}%
\file{luatexbase-attr.sty}{\from{luatexbase-attr.dtx}{texpackage}}%
}
\def\MetaPrefix{-- }
\def\luapostamble{%
\MetaPrefix^^J%
\MetaPrefix\space End of File `\outFileName'.%
}
\def\currentpostamble{\luapostamble}%
\generate{%
\usedir{tex/luatex/luatexbase}%
\file{luatexbase.attr.lua}{\from{luatexbase-attr.dtx}{luamodule}}%
}
\obeyspaces
\Msg{************************************************************************}
\Msg{*}
\Msg{* To finish the installation you have to move the following}
\Msg{* files into a directory searched by TeX:}
\Msg{*}
\Msg{* luatexbase-attr.sty luatexbase.attr.lua ...}
\Msg{*}
\Msg{* Happy TeXing!}
\Msg{*}
\Msg{************************************************************************}
\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
%<*driver>
\documentclass{ltxdoc}
\input lltxb-dtxstyle
\begin{document}
\DocInput{luatexbase-attr.dtx}%
\end{document}
%</driver>
% \fi
%
% \CheckSum{0}
%
% \CharacterTable
% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
% Digits \0\1\2\3\4\5\6\7\8\9
% Exclamation \! Double quote \" Hash (number) \#
% Dollar \$ Percent \% Ampersand \&
% Acute accent \' Left paren \( Right paren \)
% Asterisk \* Plus \+ Comma \,
Minus \- Point \. Solidus \/
% Colon \: Semicolon \; Less than \<
% Equals \= Greater than \> Question mark \?
% Commercial at \@ Left bracket \[ Backslash \\
% Right bracket \] Circumflex \^ Underscore \_
% Grave accent \` Left brace \{ Vertical bar \|
% Right brace \} Tilde \~}
%
% \GetFileInfo{luatexbase-attr.drv}
%
% \title{The \pk{luatexbase-attr} package}
% \date{DATE}
% \author{%
% Manuel P\'egouri\'e-Gonnard \\ \email{mpg@elzevir.fr} \and
% \'Elie Roux \\ \email{elie.roux@telecom-bretagne.eu}}
%
% \maketitle
%
% \begin{abstract}
% \end{abstract}
%
% \section{Documentation}
%
% \section{Implementation}
%
% \subsection{\tex package}
%
% \begin{macrocode}
%<*texpackage>
% \end{macrocode}
%
% The most important macro here is |\newluatexattribute| that allocates a
% new attribute, and adds it in the |tex.attributename| table (see
% |luatextra.attributedef_from_tex| for more details. It works just like
% the other |\new*| macros, to $65536$ attributes can be allocated.
%
% \begin{macrocode}
\newcount\lltxb@attribute@alloc
\lltxb@attribute@alloc\m@ne
\def\newluatexattribute#1{%
\ifnum\lltxb@attribute@alloc<65535\relax
\global\advance\lltxb@attribute@alloc\@ne
\allocationnumber\lltxb@attribute@alloc
\ifluatex
\global\luatexattributedef#1=\allocationnumber
\fi
\wlog{\string#1=\string\luatexattribute\the\allocationnumber}%
\begingroup\escapechar\m@ne \expandafter\endgroup
\directlua{luatextra.attributedef_from_tex(
'\luatexluaescapestring{\string#1}', '\number\allocationnumber')}%
\else
\errmessage{No room for a new \string\attribute}%
\fi}
% \end{macrocode}
%
% Two convenient macros, one to set an attribute (basically just a
% wrapper), and another one to unset it. Unsetting attributes with this
% function is important, as the \texttt{unset} value may change, as it
% already has in \luatex $0.37$.
%
% \begin{macrocode}
\def\setluatexattribute#1#2{%
#1=\numexpr#2\relax
}
\def\unsetluatexattribute#1{%
\ifnum\luatexversion<37\relax
#1=-1\relax
\else
#1=-"7FFFFFFF\relax
\fi}
% \end{macrocode}
%
% \begin{macrocode}
%</texpackage>
% \end{macrocode}
%
% \subsection{Lua module}
%
% \begin{macrocode}
%<*luamodule>
% \end{macrocode}
%
% Attribute allocation is done mainly in the \file{.sty} file, but there
% is also a Lua addition for attribute handling: \luatex is by default
% unable to tell the attribute number corresponding to an attribute name.
% This attribute number is necessary for functions such as
% |node.has_attribute|, which is used very often. The solution
% until now was to give a chosen attribute number to each attribute, and
% pray that someone else didn't use it before. With this method it was easy
% to know the number of an attribute, as it was chosen. Now with the
% |\newluaattribute| macro, it's impossible to know the
% number of an attribute. To fix it, when |\newluaattribute|
% is called, it calls |luatextra.attributedef_from_tex|. This
% function registers the number in the table |tex.attributenumber|.
% For example to get the number of the attribute |myattribute|
% registered with |\newluaattribute\myattribute|, you
% can simply call |tex.attributenumber[myattribute]|.
%
% \begin{macrocode}
module('luatextra', package.seeall)
attributes = {}
tex.attributenumber = attributes
function attributedef_from_tex(name, number)
attributes[name] = tonumber(number)
end
% \end{macrocode}
%
% \begin{macrocode}
%</luamodule>
% \end{macrocode}
%
% \Finale
\endinput
|
