summaryrefslogtreecommitdiff
path: root/luatexbase-attr.dtx
blob: 77c97abcf095d6fdbf2737c30903c4e5cad0694b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
% \iffalse meta-comment
%
% 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
%   test-regs-plain.tex test-regs-latex.tex
%
% 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}}%
}

\generate{%
  \usedir{doc/luatex/luatexbase}%
  \file{test-attr-plain.tex}{\from{luatexbase-attr.dtx}{testplain}}%
  \file{test-attr-latex.tex}{\from{luatexbase-attr.dtx}{testlatex}}%
}

\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         \~}
%
% \title{The \pk{luatexbase-attr} package}
% \date{v0.1 2010-03-11}
% \author{%
%  Manuel P\'egouri\'e-Gonnard \\ \email{mpg@elzevir.fr} \and
%   \'Elie Roux \\ \email{elie.roux@telecom-bretagne.eu}}
%
% \maketitle
%
% \begin{abstract}
% In addition to the registers existing in \tex and \etex, \luatex introduces
% a new concept: attributes. This package takes care of attribute allocation
% just like Plain TeX and LaTeX do for other registers.
% \end{abstract}
%
% \section{Documentation}
%
% The main macro defined here is |\newluatexattribute|. It behaves in the same
% way as |\newcount|. There are also two helper macros: |\setluatexattibute|
% sets an attribute's value (locally, but you can use |\global| in front of
% it). |\unsetluatexattribute| unsets an atribute by giving it a special
% value, depending on \luatex's version; you should always use this macro
% in order to be sure the correct special value for your version of \luatex is
% used.
%
% Due to the intended use of attributes, it makes no sense to locally
% allocate an attribute the way you can locally allocate a counter using
% \file{etex.sty}'s |\loccount|, so no corresponding macro is defined.
%
% The various Lua functions for manipulating attributes use a number to
% designate the attribute. Hence, package writers need a way to know the
% number of the attribute associated to |\fooattr| assuming it was defined
% using |\newluatexattribute\fooattr|, something that \luatex currently
% doesn't support (you can get the current value of the associated attribute
% as |tex.atrribute.fooattr|, but not the attribute number).
%
% There are several ways to work around this. For example, it is possible to
% extract the number at any time from the |\meaning| of |\foobar|.
% Alternatively, one could look at |\the\allocationnumber| just after the
% definition of |\fooattr| and remember it in a Lua variable. For your
% convenience, this is automatically done by |\newluatexattribute|: the number
% is remembered in a dedicated Lua table so that you can get it as
% |luatextra.attributes.foobar| (mind the absence of backslash here) at any
% time.
%
%    \section{Implementation}
%
%    \subsection{\tex package}
%
%    \begin{macrocode}
%<*texpackage>
%    \end{macrocode}
%
%    \subsubsection{Preliminaries}
%
%    Reload protection, especially for \plaintex.
%
%    \begin{macrocode}
                \csname lltxb@attr@loaded\endcsname
\expandafter\let\csname lltxb@attr@loaded\endcsname\endinput
%    \end{macrocode}
%
%    Package declaration.
%
%    \begin{macrocode}
\begingroup
  \expandafter\ifx\csname ProvidesPackage\endcsname\relax
    \def\x#1[#2]{\immediate\write16{Package: #1 #2}}
  \else
    \let\x\ProvidesPackage
  \fi
\expandafter\endgroup
\x{luatexbase-attr}[2010/03/11 v0.1  Attributes allocation for LuaTeX  (mpg)]
%    \end{macrocode}
%
%    Make sure \luatex is used.
%
%    \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname RequirePackage\endcsname\relax
  \input ifluatex.sty
\else
  \RequirePackage{ifluatex}
\fi
\ifluatex\else
  \begingroup
    \expandafter\ifx\csname PackageWarningNoLine\endcsname\relax
      \def\x#1#2{\begingroup\newlinechar10
        \immediate\write16{Package #1 warning: #2}\endgroup}
    \else
      \let\x\PackageWarningNoLine
    \fi
  \expandafter\endgroup
  \x{luatexbase-attr}{LuaTeX is required for this package.^^J
    Aborting package loading.}
  \expandafter\endinput
\fi
%    \end{macrocode}
%
%    Make sure the catcode of @ is correct, especially for \plaintex.
%
%    \begin{macrocode}
\expandafter\edef\csname lltxb@attr@AtEnd\endcsname{%
  \catcode64 \the\catcode64\relax}
\catcode64 11
%    \end{macrocode}
%
%    \subsubsection{Main content}
%
%    Load the supporting Lua module.
%
%    \begin{macrocode}
\directlua{dofile(kpse.find_file('luatexbase.attr.lua', 'lua'))}
%    \end{macrocode}
%
%    The allocaton macro.
%
%    \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
    \global\luatexattributedef#1=\allocationnumber
    \unsetluatexattribute#1%
    \begingroup\escapechar\m@ne \expandafter\endgroup
    \directlua{luatextra.attributedef_from_tex(
      '\luatexluaescapestring{\string#1}', '\number\allocationnumber')}%
    \wlog{\string#1=\string\luatexattribute\the\allocationnumber}%
  \else
    \errmessage{No room for a new \string\attribute}%
  \fi}
%    \end{macrocode}
%
%    Helper macro |\unsetluatexattribute|: depends on \luatex's version.
%
%    \begin{macrocode}
\def\unsetluatexattribute#1{%
  \ifnum\luatexversion<37\relax
    #1=-1\relax
  \else
    #1=-"7FFFFFFF\relax
  \fi}
%    \end{macrocode}
%
%    And now the trivial helper macro.
%
%    \begin{macrocode}
\def\setluatexattribute#1#2{%
  #1=\numexpr#2\relax}
%    \end{macrocode}
%
%    That's all folks!
%
%    \begin{macrocode}
\lltxb@attr@AtEnd
%</texpackage>
%    \end{macrocode}
%
%    \subsection{Lua module}
%
%    \begin{macrocode}
%<*luamodule>
module('luatextra', package.seeall)
%    \end{macrocode}
%
%    Record the allocation number in a Lua table.
%
%    \begin{macrocode}
attributes = {}
tex.attributenumber = attributes
function attributedef_from_tex(name, number)
    attributes[name] = tonumber(number)
end
%    \end{macrocode}
%
%    \begin{macrocode}
%</luamodule>
%    \end{macrocode}
%
%    \section{Test files}
%
%    The tests done are very basic: we just make sure that the package loads
%    correctly and the macros don't generate any error, under both LaTeX en
%    Plain TeX. We also check that the attribute's number is remembered well,
%    independently of the current value of |\escapechar|.
%
%    \begin{macrocode}
%<testplain>\input luatexbase-attr.sty
%<testlatex>\RequirePackage{luatexbase-attr}
%<*testplain,testlatex>
\newluatexattribute\testattr
\setluatexattribute\testattr{1}
\unsetluatexattribute\testattr
\directlua{assert(luatextra.attributes.testattr)}
\begingroup
\escapechar64
\newluatexattribute\anotherattr
\endgroup
\setluatexattribute\anotherattr{1}
\directlua{assert(luatextra.attributes.anotherattr)}
%</testplain,testlatex>
%<testplain>\bye
%<testlatex>\stop
%    \end{macrocode}
%
%
% \Finale
\endinput