summaryrefslogtreecommitdiff
path: root/Master/bin/i386-linux/perltex
blob: 52b14ef394f8190a8d49f1c157f48e0a30d9f460 (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
#! /usr/bin/env perl

###########################################################
# Prepare a LaTeX run for two-way communication with Perl #
# By Scott Pakin <scott+pt@pakin.org>                     #
###########################################################

#-------------------------------------------------------------------
# This is file `perltex.pl',
# generated with the docstrip utility.
#
# The original source files were:
#
# perltex.dtx  (with options: `perltex')
#
# This is a generated file.
#
# Copyright (C) 2007 Scott Pakin <scott+pt@pakin.org>
#
# This file may be distributed and/or modified under the conditions
# of the LaTeX Project Public License, either version 1.3c of this
# license or (at your option) any later version.  The latest
# version of this license is in:
#
#    http://www.latex-project.org/lppl.txt
#
# and version 1.3c or later is part of all distributions of LaTeX
# version 2006/05/20 or later.
#-------------------------------------------------------------------

sub top_level_eval ($)
{
    return eval $_[0];
}
use Safe;
use Opcode;
use Getopt::Long;
use Pod::Usage;
use File::Basename;
use Fcntl;
use POSIX;
use warnings;
use strict;
my $latexprog;
my $runsafely = 1;
my @permittedops;
my $progname = basename $0;
my $jobname = "texput";
my @latexcmdline;
my $toperl;
my $fromperl;
my $toflag;
my $fromflag;
my $doneflag;
my $logfile;
my $pipe;
my $styfile;
my @macroexpansions;
my $sandbox = new Safe;
my $sandbox_eval;
my $latexpid;
$latexprog = $ENV{"PERLTEX"} || "latex";
Getopt::Long::Configure("require_order", "pass_through");
GetOptions("help"     => sub {pod2usage(-verbose => 1)},
           "latex=s"  => \$latexprog,
           "safe!"    => \$runsafely,
           "makesty"  => sub {$styfile = "noperltex.sty"},
           "permit=s" => \@permittedops) || pod2usage(2);
@latexcmdline = @ARGV;
my $firstcmd = 0;
for ($firstcmd=0; $firstcmd<=$#latexcmdline; $firstcmd++) {
    my $option = $latexcmdline[$firstcmd];
    next if substr($option, 0, 1) eq "-";
    if (substr ($option, 0, 1) ne "\\") {
        $jobname = basename $option, ".tex" ;
        $latexcmdline[$firstcmd] = "\\input $option";
    }
    last;
}
push @latexcmdline, "" if $#latexcmdline==-1;
my $separator = "";
foreach (1 .. 20) {
    $separator .= chr(ord("A") + rand(26));
}
$toperl = $jobname . ".topl";
$fromperl = $jobname . ".frpl";
$toflag = $jobname . ".tfpl";
$fromflag = $jobname . ".ffpl";
$doneflag = $jobname . ".dfpl";
$logfile = $jobname . ".lgpl";
$pipe = $jobname . ".pipe";
$latexcmdline[$firstcmd] =
    sprintf '\makeatletter' . '\def%s{%s}' x 7 . '\makeatother%s',
    '\plmac@tag', $separator,
    '\plmac@tofile', $toperl,
    '\plmac@fromfile', $fromperl,
    '\plmac@toflag', $toflag,
    '\plmac@fromflag', $fromflag,
    '\plmac@doneflag', $doneflag,
    '\plmac@pipe', $pipe,
    $latexcmdline[$firstcmd];
foreach my $file ($toperl, $fromperl, $toflag, $fromflag, $doneflag, $pipe) {
    unlink $file while -e $file;
}
open (LOGFILE, ">$logfile") || die "open(\"$logfile\"): $!\n";
if (defined $styfile) {
    open (STYFILE, ">$styfile") || die "open(\"$styfile\"): $!\n";
}
if (!eval {mkfifo($pipe, 0600)}) {
    sysopen PIPE, $pipe, O_WRONLY|O_CREAT, 0755;
    print PIPE "\\endinput\n";
    close PIPE;
}
defined ($latexpid = fork) || die "fork: $!\n";
unshift @latexcmdline, $latexprog;
if (!$latexpid) {
    exec {$latexcmdline[0]} @latexcmdline;
    die "exec('@latexcmdline'): $!\n";
}
if ($runsafely) {
    @permittedops=(":browse") if $#permittedops==-1;
    $sandbox->permit_only (@permittedops);
    $sandbox_eval = sub {$sandbox->reval($_[0])};
}
else {
    $sandbox_eval = \&top_level_eval;
}
while (1) {
    my $awaitexists = sub {
      while (!-e $_[0]) {
          sleep 0;
          if (waitpid($latexpid, &WNOHANG)==-1) {
              foreach my $file ($toperl, $fromperl, $toflag,
                                $fromflag, $doneflag, $pipe) {
                  unlink $file while -e $file;
              }
              undef $latexpid;
              exit 0;
          }
      }
    };
    $awaitexists->($toflag);
    my $entirefile;
    {
        local $/ = undef;
        open (TOPERL, "<$toperl") || die "open($toperl): $!\n";
        $entirefile = <TOPERL>;
        close TOPERL;
    }
    my ($optag, $macroname, @otherstuff) =
        map {chomp; $_} split "$separator\n", $entirefile;
    $macroname =~ s/^[^A-Za-z]+//;
    $macroname =~ s/\W/_/g;
    $macroname = "latex_" . $macroname;
    if ($optag eq "USE") {
      foreach (@otherstuff) {
          s/\\/\\\\/g;
          s/\'/\\\'/g;
          $_ = "'$_'";
      }
    }
    my $perlcode;
    if ($optag eq "DEF") {
        $perlcode =
            sprintf "sub %s {%s}\n",
            $macroname, $otherstuff[0];
    }
    elsif ($optag eq "USE") {
        $perlcode = sprintf "%s (%s);\n", $macroname, join(", ", @otherstuff);
    }
    elsif ($optag eq "RUN") {
        $perlcode = $otherstuff[0];
    }
    else {
        die "${progname}: Internal error -- unexpected operation tag \"$optag\"\n";
    }
    print LOGFILE "#" x 31, " PERL CODE ", "#" x 32, "\n";
    print LOGFILE $perlcode, "\n";
    undef $_;
    my $result;
    {
        my $warningmsg;
        local $SIG{__WARN__} =
            sub {chomp ($warningmsg=$_[0]); return 0};
        $result = $sandbox_eval->($perlcode);
        if (defined $warningmsg) {
            $warningmsg =~ s/at \(eval \d+\) line \d+\W+//;
            print LOGFILE "# ===> $warningmsg\n\n";
        }
    }
    $result = "" if !$result || $optag eq "RUN";
    if ($@) {
        my $msg = $@;
        $msg =~ s/at \(eval \d+\) line \d+\W+//;
        $msg =~ s/\s+/ /;
        $result = "\\PackageError{perltex}{$msg}";
        my @helpstring;
        if ($msg =~ /\btrapped by\b/) {
            @helpstring =
                ("The preceding error message comes from Perl.  Apparently,",
                 "the Perl code you tried to execute attempted to perform an",
                 "`unsafe' operation.  If you trust the Perl code (e.g., if",
                 "you wrote it) then you can invoke perltex with the --nosafe",
                 "option to allow arbitrary Perl code to execute.",
                 "Alternatively, you can selectively enable Perl features",
                 "using perltex's --permit option.  Don't do this if you don't",
                 "trust the Perl code, however; malicious Perl code can do a",
                 "world of harm to your computer system.");
        }
        else {
            @helpstring =
              ("The preceding error message comes from Perl.  Apparently,",
               "there's a bug in your Perl code.  You'll need to sort that",
               "out in your document and re-run perltex.");
        }
        my $helpstring = join ("\\MessageBreak\n", @helpstring);
        $helpstring =~ s/\.  /.\\space\\space /g;
        $result .= "{$helpstring}";
    }
    push @macroexpansions, $result if defined $styfile && $optag eq "USE";
    print LOGFILE "%" x 30, " LATEX RESULT ", "%" x 30, "\n";
    print LOGFILE $result, "\n\n";
    $result .= '\endinput';
    open (FROMPERL, ">$fromperl") || die "open($fromperl): $!\n";
    syswrite FROMPERL, $result;
    close FROMPERL;
    unlink $toflag while -e $toflag;
    unlink $toperl while -e $toperl;
    unlink $doneflag while -e $doneflag;
    open (FROMFLAG, ">$fromflag") || die "open($fromflag): $!\n";
    close FROMFLAG;
    if (open (PIPE, ">$pipe")) {
print PIPE "\\endinput\n";
close PIPE;
    }
    $awaitexists->($toperl);
    unlink $fromflag while -e $fromflag;
    open (DONEFLAG, ">$doneflag") || die "open($doneflag): $!\n";
    close DONEFLAG;
    if (open (PIPE, ">$pipe")) {
print PIPE "\\endinput\n";
close PIPE;
    }
}
END {
    close LOGFILE;
    if (defined $latexpid) {
        kill (9, $latexpid);
        exit 1;
    }

    if (defined $styfile) {
        print STYFILE <<"STYFILEHEADER1";
\\NeedsTeXFormat{LaTeX2e}[1999/12/01]
\\ProvidesPackage{noperltex}
    [2007/09/29 v1.4 Perl-free version of PerlTeX specific to $jobname.tex]
STYFILEHEADER1
        ;
        print STYFILE <<'STYFILEHEADER2';
\RequirePackage{filecontents}

\let\noperltex@PackageError=\PackageError
\renewcommand{\PackageError}[3]{}
\RequirePackage{perltex}
\let\PackageError=\noperltex@PackageError

\newcount\plmac@macro@invocation@num
\gdef\plmac@show@placeholder#1#2\@empty{%
  \ifx#1U\relax
    \endgroup
    \advance\plmac@macro@invocation@num by 1\relax
    \global\plmac@macro@invocation@num=\plmac@macro@invocation@num
    \input{noperltex-\the\plmac@macro@invocation@num.tex}%
  \else
    \endgroup
  \fi
}
STYFILEHEADER2
        ;
        foreach my $e (0 .. $#macroexpansions) {
            print STYFILE "\n";
            printf STYFILE "%% Invocation #%d\n", 1+$e;
                printf STYFILE "\\begin{filecontents}{noperltex-%d.tex}\n", 1+$e;
            print STYFILE $macroexpansions[$e], "\\endinput\n";
            print STYFILE "\\end{filecontents}\n";
        }
        print STYFILE "\\endinput\n";
        close STYFILE;
    }

    exit 0;
}

__END__

=head1 NAME

perltex - enable LaTeX macros to be defined in terms of Perl code

=head1 SYNOPSIS

perltex
[B<--help>]
[B<--latex>=I<program>]
[B<-->[B<no>]B<safe>]
[B<--permit>=I<feature>]
[B<--makesty>]
[I<latex options>]

=head1 DESCRIPTION

LaTeX -- through the underlying TeX typesetting system -- produces
beautifully typeset documents but has a macro language that is
difficult to program.  In particular, support for complex string
manipulation is largely lacking.  Perl is a popular general-purpose
programming language whose forte is string manipulation.  However, it
has no typesetting capabilities whatsoever.

Clearly, Perl's programmability could complement LaTeX's typesetting
strengths.  B<perltex> is the tool that enables a symbiosis between
the two systems.  All a user needs to do is compile a LaTeX document
using B<perltex> instead of B<latex>.  (B<perltex> is actually a
wrapper for B<latex>, so no B<latex> functionality is lost.)  If the
document includes a C<\usepackage{perltex}> in its preamble, then
C<\perlnewcommand> and C<\perlrenewcommand> macros will be made
available.  These behave just like LaTeX's C<\newcommand> and
C<\renewcommand> except that the macro body contains Perl code instead
of LaTeX code.

=head1 OPTIONS

B<perltex> accepts the following command-line options:

=over 4

=item B<--help>

Display basic usage information.

=item B<--latex>=I<program>

Specify a program to use instead of B<latex>.  For example,
C<--latex=pdflatex> would typeset the given document using
B<pdflatex> instead of ordinary B<latex>.

=item B<-->[B<no>]B<safe>

Enable or disable sandboxing.  With the default of B<--safe>,
B<perltex> executes the code from a C<\perlnewcommand> or
C<\perlrenewcommand> macro within a protected environment that
prohibits ``unsafe'' operations such as accessing files or executing
external programs.  Specifying B<--nosafe> gives the LaTeX document
I<carte blanche> to execute any arbitrary Perl code, including that
which can harm the user's files.  See L<Safe> for more information.

=item B<--permit>=I<feature>

Permit particular Perl operations to be performed.  The B<--permit>
option, which can be specified more than once on the command line,
enables finer-grained control over the B<perltex> sandbox.  See
L<Opcode> for more information.

=item B<--makesty>

Generate a LaTeX style file called F<noperltex.sty>.  Replacing the
document's C<\usepackage{perltex}> line with C<\usepackage{noperltex}>
produces the same output but does not require PerlTeX, making the
document suitable for distribution to people who do not have PerlTeX
installed.  The disadvantage is that F<noperltex.sty> is specific to
the document that produced it.  Any changes to the document's PerlTeX
macro definitions or macro invocations necessitates rerunning
B<perltex> with the B<--makesty> option.

=back

These options are then followed by whatever options are normally
passed to B<latex> (or whatever program was specified with
C<--latex>), including, for instance, the name of the F<.tex> file to
compile.

=head1 EXAMPLES

In its simplest form, B<perltex> is run just like B<latex>:

    perltex myfile.tex

To use B<pdflatex> instead of regular B<latex>, use the B<--latex>
option:

    perltex --latex=pdflatex myfile.tex

If LaTeX gives a ``C<trapped by operation mask>'' error and you trust
the F<.tex> file you're trying to compile not to execute malicious
Perl code (e.g., because you wrote it yourself), you can disable
B<perltex>'s safety mechansisms with B<--nosafe>:

    perltex --nosafe myfile.tex

The following command gives documents only B<perltex>'s default
permissions (C<:browse>) plus the ability to open files and invoke the
C<time> command:

    perltex --permit=:browse --permit=:filesys_open
      --permit=time myfile.tex

=head1 ENVIRONMENT

B<perltex> honors the following environment variables:

=over 4

=item PERLTEX

Specify the filename of the LaTeX compiler.  The LaTeX compiler
defaults to ``C<latex>''.  The C<PERLTEX> environment variable
overrides this default, and the B<--latex> command-line option (see
L</OPTIONS>) overrides that.

=back

=head1 FILES

While compiling F<jobname.tex>, B<perltex> makes use of the following
files:

=over 4

=item F<jobname.lgpl>

log file written by Perl; helpful for debugging Perl macros

=item F<jobname.topl>

information sent from LaTeX to Perl

=item F<jobname.frpl>

information sent from Perl to LaTeX

=item F<jobname.tfpl>

``flag'' file whose existence indicates that F<jobname.topl> contains
valid data

=item F<jobname.ffpl>

``flag'' file whose existence indicates that F<jobname.frpl> contains
valid data

=item F<jobname.dfpl>

``flag'' file whose existence indicates that F<jobname.ffpl> has been
deleted

=item F<noperltex-#.tex>

file generated by F<noperltex.sty> for each PerlTeX macro invocation

=back

=head1 NOTES

B<perltex>'s sandbox defaults to what L<Opcode> calls ``C<:browse>''.

=head1 SEE ALSO

latex(1), pdflatex(1), perl(1), Safe(3pm), Opcode(3pm)

=head1 AUTHOR

Scott Pakin, I<scott+pt@pakin.org>