summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
blob: 6c37f960f78658be2506c3b11ab56d9a0aab7fb5 (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
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
% \iffalse meta-comment
%
%% File: l3luatex.dtx Copyright (C) 2010-2019 The LaTeX3 Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version.  The latest version
% of this license is in the file
%
%    https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3kernel bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
%    https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
%   The \pkg{l3luatex} package: \LuaTeX-specific functions^^A
% }
%
% \author{^^A
%  The \LaTeX3 Project\thanks
%    {^^A
%      E-mail:
%        \href{mailto:latex-team@latex-project.org}
%          {latex-team@latex-project.org}^^A
%    }^^A
% }
%
% \date{Released 2019-01-01}
%
% \maketitle
%
% \begin{documentation}
%
% The \LuaTeX{} engine provides access to the \Lua{} programming language,
% and with it access to the \enquote{internals} of \TeX{}. In order to use
% this within the framework provided here, a family of functions is
% available. When used with \pdfTeX{}, \pTeX{}, \upTeX{} or \XeTeX{} these raise an
% error: use \cs{sys_if_engine_luatex:T} to avoid this. Details on using
% \Lua{} with the \LuaTeX{} engine are given in the \LuaTeX{} manual.
%
% \section{Breaking out to \Lua{}}
%
% \begin{function}[EXP, added = 2018-06-18]{\lua_now:n, \lua_now:e}
%   \begin{syntax}
%     \cs{lua_now:n} \Arg{token list}
%   \end{syntax}
%   The \meta{token list} is first tokenized by \TeX{}, which includes
%   converting line ends to spaces in the usual \TeX{} manner and which
%   respects currently-applicable \TeX{} category codes. The resulting
%   \meta{\Lua{} input} is passed to the \Lua{} interpreter for processing.
%   Each \cs{lua_now:n} block is treated by \Lua{} as a separate chunk.
%   The \Lua{} interpreter executes the \meta{\Lua{} input} immediately,
%   and in an expandable manner.
%   \begin{texnote}
%     \cs{lua_now:e} is a macro wrapper around \tn{directlua}: when
%     \LuaTeX{} is in use two expansions are required to yield the
%     result of the \Lua{} code.
%   \end{texnote}
% \end{function}
%
% \begin{function}[added = 2018-06-18]{\lua_shipout_e:n, \lua_shipout:n}
%   \begin{syntax}
%     \cs{lua_shipout:n} \Arg{token list}
%   \end{syntax}
%   The \meta{token list} is first tokenized by \TeX{}, which includes
%   converting line ends to spaces in the usual \TeX{} manner and which
%   respects currently-applicable \TeX{} category codes.  The resulting
%   \meta{\Lua{} input} is passed to the \Lua{} interpreter when the
%   current page is finalised (\emph{i.e.}~at shipout).  Each
%   \cs{lua_shipout:n} block is treated by \Lua{} as a separate chunk.
%   The \Lua{} interpreter will execute the \meta{\Lua{} input} during the
%   page-building routine: no \TeX{} expansion of the \meta{\Lua{} input}
%   will occur at this stage.
%
%   In the case of the \cs{lua_shipout_e:n} version the input is fully
%   expanded by \TeX{} in an \texttt{e}-type manner during the shipout
%   operation.
%   \begin{texnote}
%     At a \TeX{} level, the \meta{\Lua{} input} is stored as a
%     \enquote{whatsit}.
%   \end{texnote}
% \end{function}
%
% \begin{function}[EXP, added = 2015-06-29]{\lua_escape:n, \lua_escape:e}
%   \begin{syntax}
%     \cs{lua_escape:n} \Arg{token list}
%   \end{syntax}
%   Converts the \meta{token list} such that it can safely be passed to
%   \Lua{}: embedded backslashes, double and single quotes, and newlines
%   and carriage returns are escaped. This is done by prepending an extra
%   token consisting of a backslash with category code~$12$, and for the line
%   endings, converting them to |\n| and |\r|, respectively.
%   \begin{texnote}
%     \cs{lua_escape:e} is a macro wrapper around \tn{luaescapestring}:
%     when \LuaTeX{} is in use two expansions are required to yield the
%     result of the \Lua{} code.
%   \end{texnote}
% \end{function}
%
% \section{Lua interfaces}
%
% As well as interfaces for \TeX{}, there are a small number of Lua functions
% provided here.
%
% \begin{function}{l3kernel}
%   All public interfaces provided by the module are stored within the
%   |l3kernel| table.
% \end{function}
%
% \begin{function}{l3kernel.charcat}
%   \begin{syntax}
%     |l3kernel.charcat(|\meta{charcode}, \meta{catcode}|)|
%   \end{syntax}
%   Constructs a character of \meta{charcode} and \meta{catcode} and returns
%   the result to \TeX{}.
% \end{function}
%
% \begin{function}{l3kernel.elapsedtime}
%   \begin{syntax}
%     |l3kernel.elapsedtime()|
%   \end{syntax}
%  Returns the time in \meta{scaled seconds} since the start of the \TeX{} run
%  or since |l3kernel.resettimer| was issued.
% \end{function}
%
% \begin{function}{l3kernel.filemdfivesum}
%   \begin{syntax}
%     |l3kernel.filemdfivesum(|\meta{file}|)|
%   \end{syntax}
%   Returns the of the MD5 sum of the file contents read as bytes; note that
%   the result will depend on the nature of the line endings used in the file,
%   in contrast to normal \TeX{} behaviour. If the \meta{file} is not found,
%   nothing is returned with \emph{no error raised}.
% \end{function}
%
% \begin{function}{l3kernel.filemoddate}
%   \begin{syntax}
%     |l3kernel.filemoddate(|\meta{file}|)|
%   \end{syntax}
%   Returns the of the date/time of last modification of the \meta{file} in the
%   format
%   \begin{quote}
%     |D:|\meta{year}\meta{month}\meta{day}\meta{hour}\meta{minute}^^A
%     \meta{second}\meta{offset}
%   \end{quote}
%   where the latter may be |Z| (UTC) or
%   \meta{plus-minus}\meta{hours}|'|\meta{minutes}|'|. If the \meta{file} is
%   not found, nothing is returned with \emph{no error raised}.
% \end{function}
%
% \begin{function}{l3kernel.filesize}
%   \begin{syntax}
%     |l3kernel.filesize(|\meta{file}|)|
%   \end{syntax}
%   Returns the size of the \meta{file} in bytes. If the \meta{file} is not
%   found, nothing is returned with \emph{no error raised}.
% \end{function}
%
% \begin{function}{l3kernel.resettimer}
%   \begin{syntax}
%     |l3kernel.resettimer()|
%   \end{syntax}
%  Resets the timer used by |l3kernel.elapsetime|.
% \end{function}
%
% \begin{function}{l3kernel.strcmp}
%   \begin{syntax}
%     |l3kernel.strcmp(|\meta{str one}, \meta{str two}|)|
%   \end{syntax}
%   Compares the two strings and returns |0| to \TeX{}
%   if the two are identical.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3luatex} implementation}
%
%    \begin{macrocode}
%<*initex|package>
%    \end{macrocode}
%
% \subsection{Breaking out to \Lua{}}
%
%    \begin{macrocode}
%<*tex>
%    \end{macrocode}
%
%    \begin{macrocode}
%<@@=lua>
%    \end{macrocode}
%
% \begin{macro}[EXP]{\@@_escape:n, \@@_now:n, \@@_shipout:n}
%   Copies of primitives.
%    \begin{macrocode}
\cs_new_eq:NN \@@_escape:n  \tex_luaescapestring:D
\cs_new_eq:NN \@@_now:n     \tex_directlua:D
\cs_new_eq:NN \@@_shipout:n \tex_latelua:D
%    \end{macrocode}
% \end{macro}
%
% These functions are set up in \pkg{l3str} for bootstrapping: we want to
% replace them with a \enquote{proper} version at this stage, so clean up.
%    \begin{macrocode}
\cs_undefine:N \lua_escape:e
\cs_undefine:N \lua_now:e
%    \end{macrocode}
%
% \begin{macro}[EXP]{\lua_now:n, \lua_now:e}
% \begin{macro}{\lua_shipout_e:n, \lua_shipout:n}
% \begin{macro}[EXP]{\lua_escape:n, \lua_escape:e}
%   Wrappers around the primitives. As with engines other than \LuaTeX{}
%   these have to be macros, we give them the same status in all cases.
%   When \LuaTeX{} is not in use, simply give an error message/
%    \begin{macrocode}
\cs_new:Npn \lua_now:e #1 { \@@_now:n {#1} }
\cs_new:Npn \lua_now:n #1 { \lua_now:e { \exp_not:n {#1} } }
\cs_new_protected:Npn \lua_shipout_e:n #1 { \@@_shipout:n {#1} }
\cs_new_protected:Npn \lua_shipout:n #1
  { \lua_shipout_e:n { \exp_not:n {#1} } }
\cs_new:Npn \lua_escape:e #1 { \@@_escape:n {#1} }
\cs_new:Npn \lua_escape:n #1 { \lua_escape:e { \exp_not:n {#1} } }
\sys_if_engine_luatex:F
  {
    \clist_map_inline:nn
      {
        \lua_escape:n , \lua_escape:e ,
        \lua_now:n , \lua_now:e
      }
      {
        \cs_set:Npn #1 ##1
          {
            \__kernel_msg_expandable_error:nnn
              { kernel } { luatex-required } { #1 }
          }
      }
    \clist_map_inline:nn
      { \lua_shipout_e:n , \lua_shipout:n }
      {
        \cs_set_protected:Npn #1 ##1
          {
            \__kernel_msg_error:nnn
              { kernel } { luatex-required } { #1 }
          }
      }
  }
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Messages}
%
%    \begin{macrocode}
\__kernel_msg_new:nnnn { kernel } { luatex-required }
  { LuaTeX~engine~not~in~use!~Ignoring~#1. }
  {
    The~feature~you~are~using~is~only~available~
    with~the~LuaTeX~engine.~LaTeX3~ignored~'#1'.
  }
%    \end{macrocode}
%
% \subsection{Deprecated functions}
%
% \begin{macro}[EXP, deprecated = 2019-12-31]{\lua_now_x:n, \lua_escape_x:n}
% \begin{macro}[deprecated = 2019-12-31]{\lua_shipout_x:n}
%   For removal after 2019-12-31.
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2019-12-31 } { \lua_now:e }
\cs_new:Npn \lua_now_x:n #1 { \@@_now:n {#1} }
\__kernel_patch_deprecation:nnNNpn { 2019-12-31 } { \lua_escape:e }
\cs_new:Npn \lua_escape_x:n #1 { \@@_escape:n {#1} }
\__kernel_patch_deprecation:nnNNpn { 2019-12-31 } { \lua_shipout_e:n }
\cs_new_protected:Npn \lua_shipout_x:n #1 { \@@_shipout:n {#1} }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%    \begin{macrocode}
%</tex>
%    \end{macrocode}
%
% \subsection{\Lua{} functions for internal use}
%
%    \begin{macrocode}
%<*lua>
%    \end{macrocode}
%
% Most of the emulation of \pdfTeX{} here is based heavily on Heiko Oberdiek's
% \pkg{pdftexcmds} package.
%
% \begin{macro}{l3kernel}
%   Create a table for the kernel's own use.
%    \begin{macrocode}
l3kernel = l3kernel or { }
%    \end{macrocode}
% \end{macro}
%
%   Local copies of global tables.
%    \begin{macrocode}
local io      = io
local kpse    = kpse
local lfs     = lfs
local math    = math
local md5     = md5
local os      = os
local string  = string
local tex     = tex
local unicode = unicode
%    \end{macrocode}
%
%   Local copies of standard functions.
%    \begin{macrocode}
local abs        = math.abs
local byte       = string.byte
local floor      = math.floor
local format     = string.format
local gsub       = string.gsub
if not resolvers then
  local kpse_find  = kpse.find_file
end
local lfs_attr   = lfs.attributes
local md5_sum    = md5.sum
local open       = io.open
local os_clock   = os.clock
local os_date    = os.date
local setcatcode = tex.setcatcode
local sprint     = tex.sprint
local write      = tex.write
local utf8_char  = unicode.utf8.char
%    \end{macrocode}
%
%   Deal with Con\TeX{}t: doesn't use |kpse| library.
%    \begin{macrocode}
if resolvers then
  kpse_find = resolvers.findfile
end
%    \end{macrocode}
%
% \begin{macro}[int]{escapehex}
%   An internal auxiliary to convert a string to the matching hex escape.
%   This works on a byte basis: extension to handled UTF-8 input is
%   covered in \pkg{pdftexcmds} but is not currently required here.
%    \begin{macrocode}
local function escapehex(str)
  write((gsub(str, ".",
    function (ch) return format("%02X", byte(ch)) end)))
end
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.charcat}
%   Creating arbitrary chars needs a category code table. As set up here,
%   one may have been assigned earlier (see \pkg{l3bootstrap}) or a hard-coded
%   one is used. The latter is intended for format mode and should be adjusted
%   to match an eventual allocator.
%    \begin{macrocode}
local charcat_table = l3kernel.charcat_table or 1
local function charcat(charcode, catcode)
  setcatcode(charcat_table, charcode, catcode)
  sprint(charcat_table, utf8_char(charcode))
end
l3kernel.charcat = charcat
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.elapsedtime, l3kernel.resettimer}
%   Simple timing set up: give the result from the system clock in scaled
%   seconds.
%    \begin{macrocode}
local base_time = 0
local function elapsedtime()
  local val = (os_clock() - base_time) * 65536 + 0.5
  if val > 2147483647 then
    val = 2147483647
  end
  write(format("%d",floor(val)))
end
l3kernel.elapsedtime = elapsedtime
local function resettimer()
  base_time = 0
end
l3kernel.resettimer = resettimer
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.filemdfivesum}
%   Read an entire file and hash it: the hash function itself is a built-in.
%   As Lua is byte-based there is no work needed here in terms of UTF-8
%   (see \pkg{pdftexcmds} and how it handles strings that have passed through
%   \LuaTeX{}). The file is read in binary mode so that no line ending
%   normalisation occurs.
%    \begin{macrocode}
local function filemdfivesum(name)
  local file =  kpse_find(name, "tex", true)
  if file then
    local f = open(file, "rb")
    if f then
      local data = f:read("*a")
      escapehex(md5_sum(data))
      f:close()
    end
  end
end
l3kernel.filemdfivesum = filemdfivesum
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.filemoddate}
%   See procedure \texttt{makepdftime} in \texttt{utils.c} of
%   \pdfTeX{}.
%    \begin{macrocode}
local function filemoddate(name)
  local file =  kpse_find(name, "tex", true)
  if file then
    local date = lfs_attr(file, "modification")
    if date then
      local d = os_date("*t", date)
      if d.sec >= 60 then
        d.sec = 59
      end
      local u = os_date("!*t", date)
      local off = 60 * (d.hour - u.hour) + d.min - u.min
      if d.year ~= u.year then
        if d.year > u.year then
          off = off + 1440
        else
          off = off - 1440
        end
      elseif d.yday ~= u.yday then
        if d.yday > u.yday then
          off = off + 1440
        else
          off = off - 1440
        end
      end
      local timezone
      if off == 0 then
        timezone = "Z"
      else
        local hours = floor(off / 60)
        local mins  = abs(off - hours * 60)
        timezone = format("%+03d", hours)
          .. "'" .. format("%02d", mins) .. "'"
      end
      write("D:"
        .. format("%04d", d.year)
        .. format("%02d", d.month)
        .. format("%02d", d.day)
        .. format("%02d", d.hour)
        .. format("%02d", d.min)
        .. format("%02d", d.sec)
        .. timezone)
    end
  end
end
l3kernel.filemoddate = filemoddate
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.filesize}
%   A simple disk lookup.
%    \begin{macrocode}
local function filesize(name)
  local file =  kpse_find(name, "tex", true)
  if file then
    local size = lfs_attr(file, "size")
    if size then
      write(size)
    end
  end
end
l3kernel.filesize = filesize
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.strcmp}
%   String comparison which gives the same results as \pdfTeX{}'s
%   \tn{pdfstrcmp}, although the ordering should likely not be relied upon!
%    \begin{macrocode}
local function strcmp(A, B)
  if A == B then
    write("0")
  elseif A < B then
    write("-1")
  else
    write("1")
  end
end
l3kernel.strcmp = strcmp
%    \end{macrocode}
% \end{macro}
%
% \subsection{Generic \Lua{} and font support}
%
%    \begin{macrocode}
%<*initex>
%    \end{macrocode}
%
%    \begin{macrocode}
%<@@=alloc>
%    \end{macrocode}
%
% A small amount of generic code is used by almost all \LuaTeX{} material so
% needs to be loaded by the format.
%    \begin{macrocode}
attribute_count_name = "g_@@_attribute_int"
bytecode_count_name  = "g_@@_bytecode_int"
chunkname_count_name = "g_@@_chunkname_int"
whatsit_count_name   = "g_@@_whatsit_int"
require("ltluatex")
%    \end{macrocode}
%
% With the above available the font loader code used by plain \TeX{} and
% \LaTeXe{} when used with \LuaTeX{} can be loaded here. This is thus being
% treated more-or-less as part of the engine itself.
%    \begin{macrocode}
require("luaotfload-main")
local _void = luaotfload.main()
%    \end{macrocode}
%    \begin{macrocode}
%</initex>
%    \end{macrocode}
%
%    \begin{macrocode}
%</lua>
%    \end{macrocode}
%
%    \begin{macrocode}
%</initex|package>
%    \end{macrocode}
%
%\end{implementation}
%
%\PrintIndex