summaryrefslogtreecommitdiff
path: root/autodoc.pl
blob: 2bcf263fc08f3821536f7c39e4d2b97d6c6aa270 (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
#!/usr/bin/perl -w
# 
# Unconditionally regenerate:
#
#    pod/perlintern.pod
#    pod/perlapi.pod
#
# from information stored in
#
#    embed.fnc
#    plus all the .c and .h files listed in MANIFEST
#
# Has an optional arg, which is the directory to chdir to before reading
# MANIFEST and *.[ch].
#
# This script is invoked as part of 'make all'
#
# '=head1' are the only headings looked for.  If the next line after the
# heading begins with a word character, it is considered to be the first line
# of documentation that applies to the heading itself.  That is, it is output
# immediately after the heading, before the first function, and not indented.
# The next input line that is a pod directive terminates this heading-level
# documentation.

use strict;

if (@ARGV) {
    my $workdir = shift;
    chdir $workdir
        or die "Couldn't chdir to '$workdir': $!";
}
require 'regen/regen_lib.pl';
require 'regen/embed_lib.pl';

#
# See database of global and static function prototypes in embed.fnc
# This is used to generate prototype headers under various configurations,
# export symbols lists for different platforms, and macros to provide an
# implicit interpreter context argument.
#

my %docs;
my %funcflags;
my %macro = (
	     ax => 1,
	     items => 1,
	     ix => 1,
	     svtype => 1,
	    );
my %missing;

my $curheader = "Unknown section";

sub autodoc ($$) { # parse a file and extract documentation info
    my($fh,$file) = @_;
    my($in, $doc, $line, $header_doc);
FUNC:
    while (defined($in = <$fh>)) {
	if ($in =~ /^#\s*define\s+([A-Za-z_][A-Za-z_0-9]+)\(/ &&
	    ($file ne 'embed.h' || $file ne 'proto.h')) {
	    $macro{$1} = $file;
	    next FUNC;
	}
        if ($in=~ /^=head1 (.*)/) {
            $curheader = $1;

            # If the next line begins with a word char, then is the start of
            # heading-level documentation.
	    if (defined($doc = <$fh>)) {
                if ($doc !~ /^\w/) {
                    $in = $doc;
                    redo FUNC;
                }
                $header_doc = $doc;
                $line++;

                # Continue getting the heading-level documentation until read
                # in any pod directive (or as a fail-safe, find a closing
                # comment to this pod in a C language file
HDR_DOC:
                while (defined($doc = <$fh>)) {
                    if ($doc =~ /^=\w/) {
                        $in = $doc;
                        redo FUNC;
                    }
                    $line++;

                    if ($doc =~ m:^\s*\*/$:) {
                        warn "=cut missing? $file:$line:$doc";;
                        last HDR_DOC;
                    }
                    $header_doc .= $doc;
                }
            }
            next FUNC;
        }
	$line++;
	if ($in =~ /^=for\s+apidoc\s+(.*?)\s*\n/) {
	    my $proto = $1;
	    $proto = "||$proto" unless $proto =~ /\|/;
	    my($flags, $ret, $name, @args) = split /\|/, $proto;
	    my $docs = "";
DOC:
	    while (defined($doc = <$fh>)) {
		$line++;
		last DOC if $doc =~ /^=\w+/;
		if ($doc =~ m:^\*/$:) {
		    warn "=cut missing? $file:$line:$doc";;
		    last DOC;
		}
		$docs .= $doc;
	    }
	    $docs = "\n$docs" if $docs and $docs !~ /^\n/;

	    # Check the consistency of the flags
	    my ($embed_where, $inline_where);
	    my ($embed_may_change, $inline_may_change);

	    my $docref = delete $funcflags{$name};
	    if ($docref and %$docref) {
		$embed_where = $docref->{flags} =~ /A/ ? 'api' : 'guts';
		$embed_may_change = $docref->{flags} =~ /M/;
                $flags .= 'D' if $docref->{flags} =~ /D/;
	    } else {
		$missing{$name} = $file;
	    }
	    if ($flags =~ /m/) {
		$inline_where = $flags =~ /A/ ? 'api' : 'guts';
		$inline_may_change = $flags =~ /x/;

		if (defined $embed_where && $inline_where ne $embed_where) {
		    warn "Function '$name' inconsistency: embed.fnc says $embed_where, Pod says $inline_where";
		}

		if (defined $embed_may_change
		    && $inline_may_change ne $embed_may_change) {
		    my $message = "Function '$name' inconsistency: ";
		    if ($embed_may_change) {
			$message .= "embed.fnc says 'may change', Pod does not";
		    } else {
			$message .= "Pod says 'may change', embed.fnc does not";
		    }
		    warn $message;
		}
	    } elsif (!defined $embed_where) {
		warn "Unable to place $name!\n";
		next;
	    } else {
		$inline_where = $embed_where;
		$flags .= 'x' if $embed_may_change;
		@args = @{$docref->{args}};
		$ret = $docref->{retval};
	    }

	    $docs{$inline_where}{$curheader}{$name}
		= [$flags, $docs, $ret, $file, @args];

            # Create a special entry with an empty-string name for the
            # heading-level documentation.
	    if (defined $header_doc) {
                $docs{$inline_where}{$curheader}{""} = $header_doc;
                undef $header_doc;
            }

	    if (defined $doc) {
		if ($doc =~ /^=(?:for|head)/) {
		    $in = $doc;
		    redo FUNC;
		}
	    } else {
		warn "$file:$line:$in";
	    }
	}
    }
}

sub docout ($$$) { # output the docs for one function
    my($fh, $name, $docref) = @_;
    my($flags, $docs, $ret, $file, @args) = @$docref;
    $name =~ s/\s*$//;

    if ($flags =~ /D/) {
        $docs = "\n\nDEPRECATED!  It is planned to remove this function from a
future release of Perl.  Do not use it for new code; remove it from
existing code.\n\n$docs";
    }
    else {
        $docs = "\n\nNOTE: this function is experimental and may change or be
removed without notice.\n\n$docs" if $flags =~ /x/;
    }
    $docs .= "NOTE: the perl_ form of this function is deprecated.\n\n"
	if $flags =~ /p/;
    $docs .= "NOTE: this function must be explicitly called as Perl_$name with an aTHX_ parameter.\n\n"
        if $flags =~ /o/;

    print $fh "=item $name\nX<$name>\n$docs";

    if ($flags =~ /U/) { # no usage
	# nothing
    } elsif ($flags =~ /s/) { # semicolon ("dTHR;")
	print $fh "\t\t$name;\n\n";
    } elsif ($flags =~ /n/) { # no args
	print $fh "\t$ret\t$name\n\n";
    } else { # full usage
	my $p            = $flags =~ /o/; # no #define foo Perl_foo
	my $n            = "Perl_"x$p . $name;
	my $large_ret    = length $ret > 7;
	my $indent_size  = 7+8 # nroff: 7 under =head + 8 under =item
	                  +8+($large_ret ? 1 + length $ret : 8)
	                  +length($n) + 1;
	my $indent;
	print $fh "\t$ret" . ($large_ret ? ' ' : "\t") . "$n(";
	my $long_args;
	for (@args) {
	    if ($indent_size + 2 + length > 79) {
		$long_args=1;
		$indent_size -= length($n) - 3;
		last;
	    }
	}
	my $args = '';
	if ($p) {
	    $args = @args ? "pTHX_ " : "pTHX";
	    if ($long_args) { print $fh $args; $args = '' }
	}
	$long_args and print $fh "\n";
	my $first = !$long_args;
	while () {
	    if (!@args or
	         length $args
	         && $indent_size + 3 + length($args[0]) + length $args > 79
	    ) {
		print $fh
		  $first ? '' : (
		    $indent //=
		       "\t".($large_ret ? " " x (1+length $ret) : "\t")
		      ." "x($long_args ? 4 : 1 + length $n)
		  ),
		  $args, (","x($args ne 'pTHX_ ') . "\n")x!!@args;
		$args = $first = '';
	    }
	    @args or last;
	    $args .= ", "x!!(length $args && $args ne 'pTHX_ ')
	           . shift @args;
	}
	if ($long_args) { print $fh "\n", substr $indent, 0, -4 }
	print $fh ")\n\n";
    }
    print $fh "=for hackers\nFound in file $file\n\n";
}

sub output {
    my ($podname, $header, $dochash, $missing, $footer) = @_;
    my $fh = open_new("pod/$podname.pod", undef,
		      {by => "$0 extracting documentation",
                       from => 'the C source files'}, 1);

    print $fh $header;

    my $key;
    # case insensitive sort, with fallback for determinacy
    for $key (sort { uc($a) cmp uc($b) || $a cmp $b } keys %$dochash) {
	my $section = $dochash->{$key}; 
	print $fh "\n=head1 $key\n\n";

        # Output any heading-level documentation and delete so won't get in
        # the way later
        if (exists $section->{""}) {
            print $fh $section->{""} . "\n";
            delete $section->{""};
        }
	print $fh "=over 8\n\n";

	# Again, fallback for determinacy
	for my $key (sort { uc($a) cmp uc($b) || $a cmp $b } keys %$section) {
	    docout($fh, $key, $section->{$key});
	}
	print $fh "\n=back\n";
    }

    if (@$missing) {
        print $fh "\n=head1 Undocumented functions\n\n";
    print $fh $podname eq 'perlapi' ? <<'_EOB_' : <<'_EOB_';
The following functions have been flagged as part of the public API,
but are currently undocumented.  Use them at your own risk, as the
interfaces are subject to change.  Functions that are not listed in this
document are not intended for public use, and should NOT be used under any
circumstances.

If you use one of the undocumented functions below, you may wish to consider
creating and submitting documentation
for it.  If your patch is accepted, this
will indicate that the interface is stable (unless it is explicitly marked
otherwise).

=over

_EOB_
The following functions are currently undocumented.  If you use one of
them, you may wish to consider creating and submitting documentation for
it.

=over

_EOB_
    for my $missing (sort @$missing) {
        print $fh "=item $missing\nX<$missing>\n\n";
    }
    print $fh "=back\n\n";
}
    print $fh $footer, "=cut\n";

    read_only_bottom_close_and_rename($fh);
}

foreach (@{(setup_embed())[0]}) {
    next if @$_ < 2;
    my ($flags, $retval, $func, @args) = @$_;
    s/\b(?:NN|NULLOK)\b\s+//g for @args;

    $funcflags{$func} = {
			 flags => $flags,
			 retval => $retval,
			 args => \@args,
			};
}

# glob() picks up docs from extra .c or .h files that may be in unclean
# development trees.
open my $fh, '<', 'MANIFEST'
    or die "Can't open MANIFEST: $!";
while (my $line = <$fh>) {
    next unless my ($file) = $line =~ /^(\S+\.[ch])\t/;

    open F, "< $file" or die "Cannot open $file for docs: $!\n";
    $curheader = "Functions in file $file\n";
    autodoc(\*F,$file);
    close F or die "Error closing $file: $!\n";
}
close $fh or die "Error whilst reading MANIFEST: $!";

for (sort keys %funcflags) {
    next unless $funcflags{$_}{flags} =~ /d/;
    warn "no docs for $_\n"
}

foreach (sort keys %missing) {
    next if $macro{$_};
    # Heuristics for known not-a-function macros:
    next if /^[A-Z]/;
    next if /^dj?[A-Z]/;

    warn "Function '$_', documented in $missing{$_}, not listed in embed.fnc";
}

# walk table providing an array of components in each line to
# subroutine, printing the result

# List of funcs in the public API that aren't also marked as experimental nor
# deprecated.
my @missing_api = grep $funcflags{$_}{flags} =~ /A/ && $funcflags{$_}{flags} !~ /[MD]/ && !$docs{api}{$_}, keys %funcflags;
output('perlapi', <<'_EOB_', $docs{api}, \@missing_api, <<'_EOE_');
=head1 NAME

perlapi - autogenerated documentation for the perl public API

=head1 DESCRIPTION
X<Perl API> X<API> X<api>

This file contains the documentation of the perl public API generated by
F<embed.pl>, specifically a listing of functions, macros, flags, and variables
that may be used by extension writers.  L<At the end|/Undocumented functions>
is a list of functions which have yet to be documented.  The interfaces of
those are subject to change without notice.  Anything not listed here is
not part of the public API, and should not be used by extension writers at
all.  For these reasons, blindly using functions listed in proto.h is to be
avoided when writing extensions.

Note that all Perl API global variables must be referenced with the C<PL_>
prefix.  Again, those not listed here are not to be used by extension writers,
and can be changed or removed without notice; same with macros.
Some macros are provided for compatibility with the older,
unadorned names, but this support may be disabled in a future release.

Perl was originally written to handle US-ASCII only (that is characters
whose ordinal numbers are in the range 0 - 127).
And documentation and comments may still use the term ASCII, when
sometimes in fact the entire range from 0 - 255 is meant.

Note that Perl can be compiled and run under EBCDIC (See L<perlebcdic>)
or ASCII.  Most of the documentation (and even comments in the code)
ignore the EBCDIC possibility.  
For almost all purposes the differences are transparent.
As an example, under EBCDIC,
instead of UTF-8, UTF-EBCDIC is used to encode Unicode strings, and so
whenever this documentation refers to C<utf8>
(and variants of that name, including in function names),
it also (essentially transparently) means C<UTF-EBCDIC>.
But the ordinals of characters differ between ASCII, EBCDIC, and
the UTF- encodings, and a string encoded in UTF-EBCDIC may occupy more bytes
than in UTF-8.

The listing below is alphabetical, case insensitive.

_EOB_

=head1 AUTHORS

Until May 1997, this document was maintained by Jeff Okamoto
<okamoto@corp.hp.com>.  It is now maintained as part of Perl itself.

With lots of help and suggestions from Dean Roehrich, Malcolm Beattie,
Andreas Koenig, Paul Hudson, Ilya Zakharevich, Paul Marquess, Neil
Bowers, Matthew Green, Tim Bunce, Spider Boardman, Ulrich Pfeifer,
Stephen McCamant, and Gurusamy Sarathy.

API Listing originally by Dean Roehrich <roehrich@cray.com>.

Updated to be autogenerated from comments in the source by Benjamin Stuhl.

=head1 SEE ALSO

L<perlguts>, L<perlxs>, L<perlxstut>, L<perlintern>

_EOE_

# List of non-static internal functions
my @missing_guts =
 grep $funcflags{$_}{flags} !~ /[As]/ && !$docs{guts}{$_}, keys %funcflags;

output('perlintern', <<'END', $docs{guts}, \@missing_guts, <<'END');
=head1 NAME

perlintern - autogenerated documentation of purely B<internal>
		 Perl functions

=head1 DESCRIPTION
X<internal Perl functions> X<interpreter functions>

This file is the autogenerated documentation of functions in the
Perl interpreter that are documented using Perl's internal documentation
format but are not marked as part of the Perl API.  In other words,
B<they are not for use in extensions>!

END

=head1 AUTHORS

The autodocumentation system was originally added to the Perl core by
Benjamin Stuhl.  Documentation is by whoever was kind enough to
document their functions.

=head1 SEE ALSO

L<perlguts>, L<perlapi>

END