summaryrefslogtreecommitdiff
path: root/scripts/get_abi.pl
blob: 116f0c33c16dbae7430fe49256adc7e3ac5f695b (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
#!/usr/bin/perl

use strict;
use Pod::Usage;
use Getopt::Long;
use File::Find;
use Fcntl ':mode';

my $help;
my $man;
my $debug;
my $prefix="Documentation/ABI";

GetOptions(
	"debug|d+" => \$debug,
	"dir=s" => \$prefix,
	'help|?' => \$help,
	man => \$man
) or pod2usage(2);

pod2usage(1) if $help;
pod2usage(-exitstatus => 0, -verbose => 2) if $man;

pod2usage(2) if (scalar @ARGV < 1 || @ARGV > 2);

my ($cmd, $arg) = @ARGV;

pod2usage(2) if ($cmd ne "search" && $cmd ne "rest");
pod2usage(2) if ($cmd eq "search" && !$arg);

require Data::Dumper if ($debug);

my %data;

#
# Displays an error message, printing file name and line
#
sub parse_error($$$$) {
	my ($file, $ln, $msg, $data) = @_;

	print STDERR "file $file#$ln: $msg at\n\t$data";
}

#
# Parse an ABI file, storing its contents at %data
#
sub parse_abi {
	my $file = $File::Find::name;

	my $mode = (stat($file))[2];
	return if ($mode & S_IFDIR);
	return if ($file =~ m,/README,);

	my $name = $file;
	$name =~ s,.*/,,;

	my $nametag = "File $name";
	$data{$nametag}->{what} = "File $name";
	$data{$nametag}->{type} = "File";
	$data{$nametag}->{file} = $name;
	$data{$nametag}->{filepath} = $file;
	$data{$nametag}->{is_file} = 1;

	my $type = $file;
	$type =~ s,.*/(.*)/.*,$1,;

	my $what;
	my $new_what;
	my $tag;
	my $ln;
	my $xrefs;
	my $space;
	my @labels;
	my $label;

	print STDERR "Opening $file\n" if ($debug > 1);
	open IN, $file;
	while(<IN>) {
		$ln++;
		if (m/^(\S+)(:\s*)(.*)/i) {
			my $new_tag = lc($1);
			my $sep = $2;
			my $content = $3;

			if (!($new_tag =~ m/(what|date|kernelversion|contact|description|users)/)) {
				if ($tag eq "description") {
					# New "tag" is actually part of
					# description. Don't consider it a tag
					$new_tag = "";
				} elsif ($tag ne "") {
					parse_error($file, $ln, "tag '$tag' is invalid", $_);
				}
			}

			if ($new_tag =~ m/what/) {
				$space = "";
				if ($tag =~ m/what/) {
					$what .= ", " . $content;
				} else {
					parse_error($file, $ln, "What '$what' doesn't have a description", "") if ($what && !$data{$what}->{description});

					$what = $content;
					$label = $content;
					$new_what = 1;
				}
				push @labels, [($content, $label)];
				$tag = $new_tag;

				push @{$data{$nametag}->{xrefs}}, [($content, $label)] if ($data{$nametag}->{what});
				next;
			}

			if ($tag ne "" && $new_tag) {
				$tag = $new_tag;

				if ($new_what) {
					@{$data{$what}->{label}} = @labels if ($data{$nametag}->{what});
					@labels = ();
					$label = "";
					$new_what = 0;

					$data{$what}->{type} = $type;
					$data{$what}->{file} = $name;
					$data{$what}->{filepath} = $file;
					print STDERR "\twhat: $what\n" if ($debug > 1);
				}

				if (!$what) {
					parse_error($file, $ln, "'What:' should come first:", $_);
					next;
				}
				if ($tag eq "description") {
					next if ($content =~ m/^\s*$/);
					if ($content =~ m/^(\s*)(.*)/) {
						my $new_content = $2;
						$space = $new_tag . $sep . $1;
						while ($space =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
						$space =~ s/./ /g;
						$data{$what}->{$tag} .= "$new_content\n";
					}
				} else {
					$data{$what}->{$tag} = $content;
				}
				next;
			}
		}

		# Store any contents before tags at the database
		if (!$tag && $data{$nametag}->{what}) {
			$data{$nametag}->{description} .= $_;
			next;
		}

		if ($tag eq "description") {
			if (!$data{$what}->{description}) {
				next if (m/^\s*\n/);
				if (m/^(\s*)(.*)/) {
					$space = $1;
					while ($space =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
					$data{$what}->{$tag} .= "$2\n";
				}
			} else {
				my $content = $_;
				if (m/^\s*\n/) {
					$data{$what}->{$tag} .= $content;
					next;
				}

				while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
				$space = "" if (!($content =~ s/^($space)//));

				# Compress spaces with tabs
				$content =~ s<^ {8}> <\t>;
				$content =~ s<^ {1,7}\t> <\t>;
				$content =~ s< {1,7}\t> <\t>;
				$data{$what}->{$tag} .= $content;
			}
			next;
		}
		if (m/^\s*(.*)/) {
			$data{$what}->{$tag} .= "\n$1";
			$data{$what}->{$tag} =~ s/\n+$//;
			next;
		}

		# Everything else is error
		parse_error($file, $ln, "Unexpected line:", $_);
	}
	$data{$nametag}->{description} =~ s/^\n+//;
	close IN;
}

#
# Outputs the book on ReST format
#

sub output_rest {
	foreach my $what (sort {
				($data{$a}->{type} eq "File") cmp ($data{$b}->{type} eq "File") ||
				$a cmp $b
			       } keys %data) {
		my $type = $data{$what}->{type};
		my $file = $data{$what}->{file};
		my $filepath = $data{$what}->{filepath};

		my $w = $what;
		$w =~ s/([\(\)\_\-\*\=\^\~\\])/\\$1/g;


		foreach my $p (@{$data{$what}->{label}}) {
			my ($content, $label) = @{$p};
			$label = "abi_" . $label . " ";
			$label =~ tr/A-Z/a-z/;

			# Convert special chars to "_"
			$label =~s/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\xff])/_/g;
			$label =~ s,_+,_,g;
			$label =~ s,_$,,;

			$data{$what}->{label} .= $label;

			printf ".. _%s:\n\n", $label;

			# only one label is enough
			last;
		}


		$filepath =~ s,.*/(.*/.*),\1,;;
		$filepath =~ s,[/\-],_,g;;
		my $fileref = "abi_file_".$filepath;

		if ($type eq "File") {
			my $bar = $w;
			$bar =~ s/./-/g;

			print ".. _$fileref:\n\n";
			print "$w\n$bar\n\n";
		} else {
			my @names = split /\s*,\s*/,$w;

			my $len = 0;

			foreach my $name (@names) {
				$len = length($name) if (length($name) > $len);
			}

			print "What:\n\n";

			print "+-" . "-" x $len . "-+\n";
			foreach my $name (@names) {
				printf "| %s", $name . " " x ($len - length($name)) . " |\n";
				print "+-" . "-" x $len . "-+\n";
			}
			print "\n";
		}

		print "Defined on file :ref:`$file <$fileref>`\n\n" if ($type ne "File");

		my $desc = $data{$what}->{description};
		$desc =~ s/^\s+//;

		# Remove title markups from the description, as they won't work
		$desc =~ s/\n[\-\*\=\^\~]+\n/\n/g;

		if (!($desc =~ /^\s*$/)) {
			if ($desc =~ m/\:\n/ || $desc =~ m/\n[\t ]+/  || $desc =~ m/[\x00-\x08\x0b-\x1f\x7b-\xff]/) {
				# put everything inside a code block
				$desc =~ s/\n/\n /g;

				print "::\n\n";
				print " $desc\n\n";
			} else {
				# Escape any special chars from description
				$desc =~s/([\x00-\x08\x0b-\x1f\x21-\x2a\x2d\x2f\x3c-\x40\x5c\x5e-\x60\x7b-\xff])/\\$1/g;

				print "$desc\n\n";
			}
		} else {
			print "DESCRIPTION MISSING for $what\n\n" if (!$data{$what}->{is_file});
		}

		if ($data{$what}->{xrefs}) {
			printf "Has the following ABI:\n\n";

			foreach my $p(@{$data{$what}->{xrefs}}) {
				my ($content, $label) = @{$p};
				$label = "abi_" . $label . " ";
				$label =~ tr/A-Z/a-z/;

				# Convert special chars to "_"
				$label =~s/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\xff])/_/g;
				$label =~ s,_+,_,g;
				$label =~ s,_$,,;

				# Escape special chars from content
				$content =~s/([\x00-\x1f\x21-\x2f\x3a-\x40\x7b-\xff])/\\$1/g;

				print "- :ref:`$content <$label>`\n\n";
			}
		}
	}
}

#
# Searches for ABI symbols
#
sub search_symbols {
	foreach my $what (sort keys %data) {
		next if (!($what =~ m/($arg)/));

		my $type = $data{$what}->{type};
		next if ($type eq "File");

		my $file = $data{$what}->{filepath};

		my $bar = $what;
		$bar =~ s/./-/g;

		print "\n$what\n$bar\n\n";

		my $kernelversion = $data{$what}->{kernelversion};
		my $contact = $data{$what}->{contact};
		my $users = $data{$what}->{users};
		my $date = $data{$what}->{date};
		my $desc = $data{$what}->{description};
		$kernelversion =~ s/^\s+//;
		$contact =~ s/^\s+//;
		$users =~ s/^\s+//;
		$users =~ s/\n//g;
		$date =~ s/^\s+//;
		$desc =~ s/^\s+//;

		printf "Kernel version:\t\t%s\n", $kernelversion if ($kernelversion);
		printf "Date:\t\t\t%s\n", $date if ($date);
		printf "Contact:\t\t%s\n", $contact if ($contact);
		printf "Users:\t\t\t%s\n", $users if ($users);
		print "Defined on file:\t$file\n\n";
		print "Description:\n\n$desc";
	}
}


#
# Parses all ABI files located at $prefix dir
#
find({wanted =>\&parse_abi, no_chdir => 1}, $prefix);

print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);

#
# Handles the command
#
if ($cmd eq "rest") {
	output_rest;
} else {
	search_symbols;
}


__END__

=head1 NAME

abi_book.pl - parse the Linux ABI files and produce a ReST book.

=head1 SYNOPSIS

B<abi_book.pl> [--debug] <COMAND> [<ARGUMENT>]

Where <COMMAND> can be:

=over 8

B<search> [SEARCH_REGEX] - search for [SEARCH_REGEX] inside ABI

B<rest>   - output the ABI in ReST markup language

=back

=head1 OPTIONS

=over 8

=item B<--dir>

Changes the location of the ABI search. By default, it uses
the Documentation/ABI directory.

=item B<--debug>

Put the script in verbose mode, useful for debugging. Can be called multiple
times, to increase verbosity.

=item B<--help>

Prints a brief help message and exits.

=item B<--man>

Prints the manual page and exits.

=back

=head1 DESCRIPTION

Parse the Linux ABI files from ABI DIR (usually located at Documentation/ABI),
allowing to search for ABI symbols or to produce a ReST book containing
the Linux ABI documentation.

=head1 EXAMPLES

Search for all stable symbols with the word "usb":

=over 8

$ scripts/get_abi.pl search usb --dir Documentation/ABI/stable

=back

Search for all symbols that match the regex expression "usb.*cap":

=over 8

$ scripts/get_abi.pl search usb.*cap

=back

Output all obsoleted symbols in ReST format

=over 8

$ scripts/get_abi.pl rest --dir Documentation/ABI/obsolete

=back

=head1 BUGS

Report bugs to Mauro Carvalho Chehab <mchehab@s-opensource.com>

=head1 COPYRIGHT

Copyright (c) 2016-2017 by Mauro Carvalho Chehab <mchehab@s-opensource.com>.

License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.

This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

=cut