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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [etc/] [texi2pod.pl] - Blame information for rev 829

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1 207 jeremybenn
#! /usr/bin/perl -w
2
 
3
#   Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
4
 
5
# This file is part of GCC.
6
 
7
# GCC is free software; you can redistribute it and/or modify
8
# it under the terms of the GNU General Public License as published by
9
# the Free Software Foundation; either version 2, or (at your option)
10
# any later version.
11
 
12
# GCC is distributed in the hope that it will be useful,
13
# but WITHOUT ANY WARRANTY; without even the implied warranty of
14
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
# GNU General Public License for more details.
16
 
17
# You should have received a copy of the GNU General Public License
18
# along with GCC; see the file COPYING.  If not, write to
19
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20
# Boston MA 02110-1301, USA.
21
 
22
# This does trivial (and I mean _trivial_) conversion of Texinfo
23
# markup to Perl POD format.  It's intended to be used to extract
24
# something suitable for a manpage from a Texinfo document.
25
 
26
$output = 0;
27
$skipping = 0;
28
%sects = ();
29
$section = "";
30
@icstack = ();
31
@endwstack = ();
32
@skstack = ();
33
@instack = ();
34
$shift = "";
35
%defs = ();
36
$fnno = 1;
37
$inf = "";
38
$ibase = "";
39
@ipath = ();
40
 
41
while ($_ = shift) {
42
    if (/^-D(.*)$/) {
43
        if ($1 ne "") {
44
            $flag = $1;
45
        } else {
46
            $flag = shift;
47
        }
48
        $value = "";
49
        ($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/);
50
        die "no flag specified for -D\n"
51
            unless $flag ne "";
52
        die "flags may only contain letters, digits, hyphens, dashes and underscores\n"
53
            unless $flag =~ /^[a-zA-Z0-9_-]+$/;
54
        $defs{$flag} = $value;
55
    } elsif (/^-I(.*)$/) {
56
        if ($1 ne "") {
57
            $flag = $1;
58
        } else {
59
            $flag = shift;
60
        }
61
        push (@ipath, $flag);
62
    } elsif (/^-/) {
63
        usage();
64
    } else {
65
        $in = $_, next unless defined $in;
66
        $out = $_, next unless defined $out;
67
        usage();
68
    }
69
}
70
 
71
if (defined $in) {
72
    $inf = gensym();
73
    open($inf, "<$in") or die "opening \"$in\": $!\n";
74
    $ibase = $1 if $in =~ m|^(.+)/[^/]+$|;
75
} else {
76
    $inf = \*STDIN;
77
}
78
 
79
if (defined $out) {
80
    open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
81
}
82
 
83
while(defined $inf) {
84
while(<$inf>) {
85
    # Certain commands are discarded without further processing.
86
    /^\@(?:
87
         [a-z]+index            # @*index: useful only in complete manual
88
         |need                  # @need: useful only in printed manual
89
         |(?:end\s+)?group      # @group .. @end group: ditto
90
         |page                  # @page: ditto
91
         |node                  # @node: useful only in .info file
92
         |(?:end\s+)?ifnottex   # @ifnottex .. @end ifnottex: use contents
93
        )\b/x and next;
94
 
95
    chomp;
96
 
97
    # Look for filename and title markers.
98
    /^\@setfilename\s+([^.]+)/ and $fn = $1, next;
99
    /^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next;
100
 
101
    # Identify a man title but keep only the one we are interested in.
102
    /^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do {
103
        if (exists $defs{$1}) {
104
            $fn = $1;
105
            $tl = postprocess($2);
106
        }
107
        next;
108
    };
109
 
110
    # Look for blocks surrounded by @c man begin SECTION ... @c man end.
111
    # This really oughta be @ifman ... @end ifman and the like, but such
112
    # would require rev'ing all other Texinfo translators.
113
    /^\@c\s+man\s+begin\s+([A-Z]+)\s+([A-Za-z0-9-]+)/ and do {
114
        $output = 1 if exists $defs{$2};
115
        $sect = $1;
116
        next;
117
    };
118
    /^\@c\s+man\s+begin\s+([A-Z]+)/ and $sect = $1, $output = 1, next;
119
    /^\@c\s+man\s+end/ and do {
120
        $sects{$sect} = "" unless exists $sects{$sect};
121
        $sects{$sect} .= postprocess($section);
122
        $section = "";
123
        $output = 0;
124
        next;
125
    };
126
 
127
    # handle variables
128
    /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and do {
129
        $defs{$1} = $2;
130
        next;
131
    };
132
    /^\@clear\s+([a-zA-Z0-9_-]+)/ and do {
133
        delete $defs{$1};
134
        next;
135
    };
136
 
137
    next unless $output;
138
 
139
    # Discard comments.  (Can't do it above, because then we'd never see
140
    # @c man lines.)
141
    /^\@c\b/ and next;
142
 
143
    # End-block handler goes up here because it needs to operate even
144
    # if we are skipping.
145
    /^\@end\s+([a-z]+)/ and do {
146
        # Ignore @end foo, where foo is not an operation which may
147
        # cause us to skip, if we are presently skipping.
148
        my $ended = $1;
149
        next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex|copying)$/;
150
 
151
        die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
152
        die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
153
 
154
        $endw = pop @endwstack;
155
 
156
        if ($ended =~ /^(?:ifset|ifclear|ignore|menu|iftex)$/) {
157
            $skipping = pop @skstack;
158
            next;
159
        } elsif ($ended =~ /^(?:example|smallexample|display)$/) {
160
            $shift = "";
161
            $_ = "";    # need a paragraph break
162
        } elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) {
163
            $_ = "\n=back\n";
164
            $ic = pop @icstack;
165
        } elsif ($ended eq "multitable") {
166
            $_ = "\n=back\n";
167
        } else {
168
            die "unknown command \@end $ended at line $.\n";
169
        }
170
    };
171
 
172
    # We must handle commands which can cause skipping even while we
173
    # are skipping, otherwise we will not process nested conditionals
174
    # correctly.
175
    /^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
176
        push @endwstack, $endw;
177
        push @skstack, $skipping;
178
        $endw = "ifset";
179
        $skipping = 1 unless exists $defs{$1};
180
        next;
181
    };
182
 
183
    /^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
184
        push @endwstack, $endw;
185
        push @skstack, $skipping;
186
        $endw = "ifclear";
187
        $skipping = 1 if exists $defs{$1};
188
        next;
189
    };
190
 
191
    /^\@(ignore|menu|iftex|copying)\b/ and do {
192
        push @endwstack, $endw;
193
        push @skstack, $skipping;
194
        $endw = $1;
195
        $skipping = 1;
196
        next;
197
    };
198
 
199
    next if $skipping;
200
 
201
    # Character entities.  First the ones that can be replaced by raw text
202
    # or discarded outright:
203
    s/\@copyright\{\}/(c)/g;
204
    s/\@dots\{\}/.../g;
205
    s/\@enddots\{\}/..../g;
206
    s/\@([.!? ])/$1/g;
207
    s/\@[:-]//g;
208
    s/\@bullet(?:\{\})?/*/g;
209
    s/\@TeX\{\}/TeX/g;
210
    s/\@pounds\{\}/\#/g;
211
    s/\@minus(?:\{\})?/-/g;
212
    s/\\,/,/g;
213
 
214
    # Now the ones that have to be replaced by special escapes
215
    # (which will be turned back into text by unmunge())
216
    s/&/&amp;/g;
217
    s/\@\{/&lbrace;/g;
218
    s/\@\}/&rbrace;/g;
219
    s/\@\@/&at;/g;
220
 
221
    # Inside a verbatim block, handle @var specially.
222
    if ($shift ne "") {
223
        s/\@var\{([^\}]*)\}/<$1>/g;
224
    }
225
 
226
    # POD doesn't interpret E<> inside a verbatim block.
227
    if ($shift eq "") {
228
        s/</&lt;/g;
229
        s/>/&gt;/g;
230
    } else {
231
        s/</&LT;/g;
232
        s/>/&GT;/g;
233
    }
234
 
235
    # Single line command handlers.
236
 
237
    /^\@include\s+(.+)$/ and do {
238
        push @instack, $inf;
239
        $inf = gensym();
240
        $file = postprocess($1);
241
 
242
        # Try cwd and $ibase, then explicit -I paths.
243
        $done = 0;
244
        foreach $path ("", $ibase, @ipath) {
245
            $mypath = $file;
246
            $mypath = $path . "/" . $mypath if ($path ne "");
247
            open($inf, "<" . $mypath) and ($done = 1, last);
248
        }
249
        die "cannot find $file" if !$done;
250
        next;
251
    };
252
 
253
    /^\@(?:section|unnumbered|unnumberedsec|center)\s+(.+)$/
254
        and $_ = "\n=head2 $1\n";
255
    /^\@subsection\s+(.+)$/
256
        and $_ = "\n=head3 $1\n";
257
    /^\@subsubsection\s+(.+)$/
258
        and $_ = "\n=head4 $1\n";
259
 
260
    # Block command handlers:
261
    /^\@itemize(?:\s+(\@[a-z]+|\*|-))?/ and do {
262
        push @endwstack, $endw;
263
        push @icstack, $ic;
264
        if (defined $1) {
265
            $ic = $1;
266
        } else {
267
            $ic = '*';
268
        }
269
        $_ = "\n=over 4\n";
270
        $endw = "itemize";
271
    };
272
 
273
    /^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do {
274
        push @endwstack, $endw;
275
        push @icstack, $ic;
276
        if (defined $1) {
277
            $ic = $1 . ".";
278
        } else {
279
            $ic = "1.";
280
        }
281
        $_ = "\n=over 4\n";
282
        $endw = "enumerate";
283
    };
284
 
285
    /^\@multitable\s.*/ and do {
286
        push @endwstack, $endw;
287
        $endw = "multitable";
288
        $_ = "\n=over 4\n";
289
    };
290
 
291
    /^\@([fv]?table)\s+(\@[a-z]+)/ and do {
292
        push @endwstack, $endw;
293
        push @icstack, $ic;
294
        $endw = $1;
295
        $ic = $2;
296
        $ic =~ s/\@(?:samp|strong|key|gcctabopt|env)/B/;
297
        $ic =~ s/\@(?:code|kbd)/C/;
298
        $ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
299
        $ic =~ s/\@(?:file)/F/;
300
        $_ = "\n=over 4\n";
301
    };
302
 
303
    /^\@((?:small)?example|display)/ and do {
304
        push @endwstack, $endw;
305
        $endw = $1;
306
        $shift = "\t";
307
        $_ = "";        # need a paragraph break
308
    };
309
 
310
    /^\@item\s+(.*\S)\s*$/ and $endw eq "multitable" and do {
311
        @columns = ();
312
        for $column (split (/\s*\@tab\s*/, $1)) {
313
            # @strong{...} is used a @headitem work-alike
314
            $column =~ s/^\@strong{(.*)}$/$1/;
315
            push @columns, $column;
316
        }
317
        $_ = "\n=item ".join (" : ", @columns)."\n";
318
    };
319
 
320
    /^\@itemx?\s*(.+)?$/ and do {
321
        if (defined $1) {
322
            # Entity escapes prevent munging by the <> processing below.
323
            $_ = "\n=item $ic\&LT;$1\&GT;\n";
324
        } else {
325
            $_ = "\n=item $ic\n";
326
            $ic =~ y/A-Ya-y/B-Zb-z/;
327
            $ic =~ s/(\d+)/$1 + 1/eg;
328
        }
329
    };
330
 
331
    $section .= $shift.$_."\n";
332
}
333
# End of current file.
334
close($inf);
335
$inf = pop @instack;
336
}
337
 
338
die "No filename or title\n" unless defined $fn && defined $tl;
339
 
340
$sects{NAME} = "$fn \- $tl\n";
341
$sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
342
 
343
for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
344
              BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
345
    if(exists $sects{$sect}) {
346
        $head = $sect;
347
        $head =~ s/SEEALSO/SEE ALSO/;
348
        print "=head1 $head\n\n";
349
        print scalar unmunge ($sects{$sect});
350
        print "\n";
351
    }
352
}
353
 
354
sub usage
355
{
356
    die "usage: $0 [-D toggle...] [infile [outfile]]\n";
357
}
358
 
359
sub postprocess
360
{
361
    local $_ = $_[0];
362
 
363
    # @value{foo} is replaced by whatever 'foo' is defined as.
364
    while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) {
365
        if (! exists $defs{$2}) {
366
            print STDERR "Option $2 not defined\n";
367
            s/\Q$1\E//;
368
        } else {
369
            $value = $defs{$2};
370
            s/\Q$1\E/$value/;
371
        }
372
    }
373
 
374
    # Formatting commands.
375
    # Temporary escape for @r.
376
    s/\@r\{([^\}]*)\}/R<$1>/g;
377
    s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g;
378
    s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g;
379
    s/\@(?:gccoptlist|samp|strong|key|option|env|command|b)\{([^\}]*)\}/B<$1>/g;
380
    s/\@sc\{([^\}]*)\}/\U$1/g;
381
    s/\@file\{([^\}]*)\}/F<$1>/g;
382
    s/\@w\{([^\}]*)\}/S<$1>/g;
383
    s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;
384
 
385
    # keep references of the form @ref{...}, print them bold
386
    s/\@(?:ref)\{([^\}]*)\}/B<$1>/g;
387
 
388
    # Change double single quotes to double quotes.
389
    s/''/"/g;
390
    s/``/"/g;
391
 
392
    # Cross references are thrown away, as are @noindent and @refill.
393
    # (@noindent is impossible in .pod, and @refill is unnecessary.)
394
    # @* is also impossible in .pod; we discard it and any newline that
395
    # follows it.  Similarly, our macro @gol must be discarded.
396
 
397
    s/\(?\@xref\{(?:[^\}]*)\}(?:[^.<]|(?:<[^<>]*>))*\.\)?//g;
398
    s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
399
    s/;\s+\@pxref\{(?:[^\}]*)\}//g;
400
    s/\@noindent\s*//g;
401
    s/\@refill//g;
402
    s/\@gol//g;
403
    s/\@\*\s*\n?//g;
404
 
405
    # Anchors are thrown away
406
    s/\@anchor\{(?:[^\}]*)\}//g;
407
 
408
    # @uref can take one, two, or three arguments, with different
409
    # semantics each time.  @url and @email are just like @uref with
410
    # one argument, for our purposes.
411
    s/\@(?:uref|url|email)\{([^\},]*)\}/&lt;B<$1>&gt;/g;
412
    s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g;
413
    s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g;
414
 
415
    # Un-escape <> at this point.
416
    s/&LT;/</g;
417
    s/&GT;/>/g;
418
 
419
    # Now un-nest all B<>, I<>, R<>.  Theoretically we could have
420
    # indefinitely deep nesting; in practice, one level suffices.
421
    1 while s/([BIR])<([^<>]*)([BIR])<([^<>]*)>/$1<$2>$3<$4>$1</g;
422
 
423
    # Replace R<...> with bare ...; eliminate empty markup, B<>;
424
    # shift white space at the ends of [BI]<...> expressions outside
425
    # the expression.
426
    s/R<([^<>]*)>/$1/g;
427
    s/[BI]<>//g;
428
    s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
429
    s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
430
 
431
    # Extract footnotes.  This has to be done after all other
432
    # processing because otherwise the regexp will choke on formatting
433
    # inside @footnote.
434
    while (/\@footnote/g) {
435
        s/\@footnote\{([^\}]+)\}/[$fnno]/;
436
        add_footnote($1, $fnno);
437
        $fnno++;
438
    }
439
 
440
    return $_;
441
}
442
 
443
sub unmunge
444
{
445
    # Replace escaped symbols with their equivalents.
446
    local $_ = $_[0];
447
 
448
    s/&lt;/E<lt>/g;
449
    s/&gt;/E<gt>/g;
450
    s/&lbrace;/\{/g;
451
    s/&rbrace;/\}/g;
452
    s/&at;/\@/g;
453
    s/&amp;/&/g;
454
    return $_;
455
}
456
 
457
sub add_footnote
458
{
459
    unless (exists $sects{FOOTNOTES}) {
460
        $sects{FOOTNOTES} = "\n=over 4\n\n";
461
    }
462
 
463
    $sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
464
    $sects{FOOTNOTES} .= $_[0];
465
    $sects{FOOTNOTES} .= "\n\n";
466
}
467
 
468
# stolen from Symbol.pm
469
{
470
    my $genseq = 0;
471
    sub gensym
472
    {
473
        my $name = "GEN" . $genseq++;
474
        my $ref = \*{$name};
475
        delete $::{$name};
476
        return $ref;
477
    }
478
}

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