[linux-2.6-block.git] / scripts / get_abi.pl

#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0

use strict;
use warnings;
use utf8;
use Pod::Usage;
use Getopt::Long;
use File::Find;
use Fcntl ':mode';

my $help = 0;
my $man = 0;
my $debug = 0;
my $enable_lineno = 0;
my $prefix="Documentation/ABI";

#
# If true, assumes that the description is formatted with ReST
#
my $description_is_rst = 1;

GetOptions(
	"debug|d+" => \$debug,
	"enable-lineno" => \$enable_lineno,
	"rst-source!" => \$description_is_rst,
	"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" && $cmd ne "validate");
pod2usage(2) if ($cmd eq "search" && !$arg);

require Data::Dumper if ($debug);

my %data;
my %symbols;

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

	$data =~ s/\s+$/\n/;

	print STDERR "Warning: file $file#$ln:\n\t$msg";

	if ($data ne "") {
		print STDERR ". Line\n\t\t$data";
	} else {
	    print STDERR "\n";
	}
}

#
# 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 $fn = $file;
	$fn =~ s,Documentation/ABI/,,;

	my $nametag = "File $fn";
	$data{$nametag}->{what} = "File $name";
	$data{$nametag}->{type} = "File";
	$data{$nametag}->{file} = $name;
	$data{$nametag}->{filepath} = $file;
	$data{$nametag}->{is_file} = 1;
	$data{$nametag}->{line_no} = 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 (!($new_tag =~ m/(what|where|date|kernelversion|contact|description|users)/)) {
				if ($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", $_);
				}
			}

			# Invalid, but it is a common mistake
			if ($new_tag eq "where") {
				parse_error($file, $ln, "tag 'Where' is invalid. Should be 'What:' instead", "");
				$new_tag = "what";
			}

			if ($new_tag =~ m/what/) {
				$space = "";
				$content =~ s/[,.;]$//;

				push @{$symbols{$content}->{file}}, " $file:" . ($ln - 1);

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

						foreach my $w(split /, /, $what) {
							$symbols{$w}->{xref} = $what;
						};
					}

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

				push @{$data{$nametag}->{symbols}}, $content if ($data{$nametag}->{what});
				next;
			}

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

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

					$data{$what}->{type} = $type;
					if (!defined($data{$what}->{file})) {
						$data{$what}->{file} = $name;
						$data{$what}->{filepath} = $file;
					} else {
						if ($name ne $data{$what}->{file}) {
							$data{$what}->{file} .= " " . $name;
							$data{$what}->{filepath} .= " " . $file;
						}
					}
					print STDERR "\twhat: $what\n" if ($debug > 1);
					$data{$what}->{line_no} = $ln;
				} else {
					$data{$what}->{line_no} = $ln if (!defined($data{$what}->{line_no}));
				}

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

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

			if (!defined($space)) {
				# Preserve initial spaces for the first line
				if ($content =~ m/^(\s*)(\S.*)$/) {
					$space = $1;
					$content = "$2\n";
				}
			} else {
				$space = "" if (!($content =~ s/^($space)//));
			}
			$data{$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 content", $_);
	}
	$data{$nametag}->{description} =~ s/^\n+// if ($data{$nametag}->{description});
	if ($what) {
		parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});

		foreach my $w(split /, /,$what) {
			$symbols{$w}->{xref} = $what;
		};
	}
	close IN;
}

sub create_labels {
	my %labels;

	foreach my $what (keys %data) {
		next if ($data{$what}->{file} eq "File");

		foreach my $p (@{$data{$what}->{label_list}}) {
			my ($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;
			$label =~ s,_$,,;

			# Avoid duplicated labels
			while (defined($labels{$label})) {
			    my @chars = ("A".."Z", "a".."z");
			    $label .= $chars[rand @chars];
			}
			$labels{$label} = 1;

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

			# only one label is enough
			last;
		}
	}
}

#
# Outputs the book on ReST format
#

# \b doesn't work well with paths. So, we need to define something else:
# Boundaries are punct characters, spaces and end-of-line
my $start = qr {(^|\s|\() }x;
my $bondary = qr { ([,.:;\)\s]|\z) }x;
my $xref_match = qr { $start(\/(sys|config|proc|dev|kvd)\/[^,.:;\)\s]+)$bondary }x;
my $symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x2f\x3a-\x40\x7b-\xff]) }x;

sub output_rest {
	create_labels();

	my $part = "";

	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 = split / /, $data{$what}->{file};
		my @filepath = split / /, $data{$what}->{filepath};

		if ($enable_lineno) {
			printf "#define LINENO %s%s#%s\n\n",
			       $prefix, $file[0],
			       $data{$what}->{line_no};
		}

		my $w = $what;

		if ($type ne "File") {
			my $cur_part = $what;
			if ($what =~ '/') {
				if ($what =~ m#^(\/?(?:[\w\-]+\/?){1,2})#) {
					$cur_part = "Symbols under $1";
					$cur_part =~ s,/$,,;
				}
			}

			if ($cur_part ne "" && $part ne $cur_part) {
			    $part = $cur_part;
			    my $bar = $part;
			    $bar =~ s/./-/g;
			    print "$part\n$bar\n\n";
			}

			printf ".. _%s:\n\n", $data{$what}->{label};

			my @names = split /, /,$w;
			my $len = 0;

			foreach my $name (@names) {
				$name =~ s/$symbols/\\$1/g;
				$name = "**$name**";
				$len = length($name) if (length($name) > $len);
			}

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

			print "\n";
		}

		for (my $i = 0; $i < scalar(@filepath); $i++) {
			my $path = $filepath[$i];
			my $f = $file[$i];

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

			if ($type eq "File") {
				print ".. _$fileref:\n\n";
			} else {
				print "Defined on file :ref:`$f <$fileref>`\n\n";
			}
		}

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

		my $desc = "";
		$desc = $data{$what}->{description} if (defined($data{$what}->{description}));
		$desc =~ s/\s+$/\n/;

		if (!($desc =~ /^\s*$/)) {
			if ($description_is_rst) {
				# Remove title markups from the description
				# Having titles inside ABI files will only work if extra
				# care would be taken in order to strictly follow the same
				# level order for each markup.
				$desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;

				# Enrich text by creating cross-references

				my $new_desc = "";
				open(my $fh, "+<", \$desc);
				while (my $d = <$fh>) {
					$d =~ s,Documentation/(?!devicetree)(\S+)\.rst,:doc:`/$1`,g;

					my @matches = $d =~ m,Documentation/ABI/([\w\/\-]+),g;
					foreach my $f (@matches) {
						my $xref = $f;
						my $path = $f;
						$path =~ s,.*/(.*/.*),$1,;;
						$path =~ s,[/\-],_,g;;
						$xref .= " <abi_file_" . $path . ">";
						$d =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
					}

					# Seek for cross reference symbols like /sys/...
					@matches = $d =~ m/$xref_match/g;

					foreach my $s (@matches) {
						next if (!($s =~ m,/,));
						if (defined($data{$s}) && defined($data{$s}->{label})) {
							my $xref = $s;

							$xref =~ s/$symbols/\\$1/g;
							$xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";

							$d =~ s,$start$s$bondary,$1$xref$2,g;
						}
					}
					$new_desc .= $d;
				}
				close $fh;


				print "$new_desc\n\n";
			} else {
				$desc =~ s/^\s+//;

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

				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}->{symbols}) {
			printf "Has the following ABI:\n\n";

			foreach my $content(@{$data{$what}->{symbols}}) {
				my $label = $data{$symbols{$content}->{xref}}->{label};

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

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

		if (defined($data{$what}->{users})) {
			my $users = $data{$what}->{users};

			$users =~ s/\n/\n\t/g;
			printf "Users:\n\t%s\n\n", $users if ($users ne "");
		}

	}
}

#
# 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} if (defined($data{$what}->{kernelversion}));
		my $contact = $data{$what}->{contact} if (defined($data{$what}->{contact}));
		my $users = $data{$what}->{users} if (defined($data{$what}->{users}));
		my $date = $data{$what}->{date} if (defined($data{$what}->{date}));
		my $desc = $data{$what}->{description} if (defined($data{$what}->{description}));

		$kernelversion =~ s/^\s+// if ($kernelversion);
		$contact =~ s/^\s+// if ($contact);
		if ($users) {
			$users =~ s/^\s+//;
			$users =~ s/\n//g;
		}
		$date =~ s/^\s+// if ($date);
		$desc =~ s/^\s+// if ($desc);

		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(s):\t$file\n\n";
		print "Description:\n\n$desc";
	}
}

# Ensure that the prefix will always end with a slash
# While this is not needed for find, it makes the patch nicer
# with --enable-lineno
$prefix =~ s,/?$,/,;

#
# 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 ($cmd eq "search") {
	search_symbols;
} else {
	if ($cmd eq "rest") {
		output_rest;
	}

	# Warn about duplicated ABI entries
	foreach my $what(sort keys %symbols) {
		my @files = @{$symbols{$what}->{file}};

		next if (scalar(@files) == 1);

		printf STDERR "Warning: $what is defined %d times: @files\n",
		    scalar(@files);
	}
}

__END__

=head1 NAME

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

=head1 SYNOPSIS

B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
	       [--(no-)rst-source] [--dir=<dir>] <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

B<validate>              - validate the ABI contents

=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<--rst-source> and B<--no-rst-source>

The input file may be using ReST syntax or not. Those two options allow
selecting between a rst-compliant source ABI (--rst-source), or a
plain text that may be violating ReST spec, so it requres some escaping
logic (--no-rst-source).

=item B<--enable-lineno>

Enable output of #define LINENO lines.

=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+samsung@kernel.org>

=head1 COPYRIGHT

Copyright (c) 2016-2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.

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
Commit	Line	Data
	1	#!/usr/bin/env perl
	2	# SPDX-License-Identifier: GPL-2.0
	3
	4	use strict;
	5	use warnings;
	6	use utf8;
	7	use Pod::Usage;
	8	use Getopt::Long;
	9	use File::Find;
	10	use Fcntl ':mode';
	11
	12	my $help = 0;
	13	my $man = 0;
	14	my $debug = 0;
	15	my $enable_lineno = 0;
	16	my $prefix="Documentation/ABI";
	17
	18	#
	19	# If true, assumes that the description is formatted with ReST
	20	#
	21	my $description_is_rst = 1;
	22
	23	GetOptions(
	24	"debug\|d+" => \$debug,
	25	"enable-lineno" => \$enable_lineno,
	26	"rst-source!" => \$description_is_rst,
	27	"dir=s" => \$prefix,
	28	'help\|?' => \$help,
	29	man => \$man
	30	) or pod2usage(2);
	31
	32	pod2usage(1) if $help;
	33	pod2usage(-exitstatus => 0, -verbose => 2) if $man;
	34
	35	pod2usage(2) if (scalar @ARGV < 1 \|\| @ARGV > 2);
	36
	37	my ($cmd, $arg) = @ARGV;
	38
	39	pod2usage(2) if ($cmd ne "search" && $cmd ne "rest" && $cmd ne "validate");
	40	pod2usage(2) if ($cmd eq "search" && !$arg);
	41
	42	require Data::Dumper if ($debug);
	43
	44	my %data;
	45	my %symbols;
	46
	47	#
	48	# Displays an error message, printing file name and line
	49	#
	50	sub parse_error($$$$) {
	51	my ($file, $ln, $msg, $data) = @_;
	52
	53	$data =~ s/\s+$/\n/;
	54
	55	print STDERR "Warning: file $file#$ln:\n\t$msg";
	56
	57	if ($data ne "") {
	58	print STDERR ". Line\n\t\t$data";
	59	} else {
	60	print STDERR "\n";
	61	}
	62	}
	63
	64	#
	65	# Parse an ABI file, storing its contents at %data
	66	#
	67	sub parse_abi {
	68	my $file = $File::Find::name;
	69
	70	my $mode = (stat($file))[2];
	71	return if ($mode & S_IFDIR);
	72	return if ($file =~ m,/README,);
	73
	74	my $name = $file;
	75	$name =~ s,.*/,,;
	76
	77	my $fn = $file;
	78	$fn =~ s,Documentation/ABI/,,;
	79
	80	my $nametag = "File $fn";
	81	$data{$nametag}->{what} = "File $name";
	82	$data{$nametag}->{type} = "File";
	83	$data{$nametag}->{file} = $name;
	84	$data{$nametag}->{filepath} = $file;
	85	$data{$nametag}->{is_file} = 1;
	86	$data{$nametag}->{line_no} = 1;
	87
	88	my $type = $file;
	89	$type =~ s,./(.)/.*,$1,;
	90
	91	my $what;
	92	my $new_what;
	93	my $tag = "";
	94	my $ln;
	95	my $xrefs;
	96	my $space;
	97	my @labels;
	98	my $label = "";
	99
	100	print STDERR "Opening $file\n" if ($debug > 1);
	101	open IN, $file;
	102	while(<IN>) {
	103	$ln++;
	104	if (m/^(\S+)(:\s)(.)/i) {
	105	my $new_tag = lc($1);
	106	my $sep = $2;
	107	my $content = $3;
	108
	109	if (!($new_tag =~ m/(what\|where\|date\|kernelversion\|contact\|description\|users)/)) {
	110	if ($tag eq "description") {
	111	# New "tag" is actually part of
	112	# description. Don't consider it a tag
	113	$new_tag = "";
	114	} elsif ($tag ne "") {
	115	parse_error($file, $ln, "tag '$tag' is invalid", $_);
	116	}
	117	}
	118
	119	# Invalid, but it is a common mistake
	120	if ($new_tag eq "where") {
	121	parse_error($file, $ln, "tag 'Where' is invalid. Should be 'What:' instead", "");
	122	$new_tag = "what";
	123	}
	124
	125	if ($new_tag =~ m/what/) {
	126	$space = "";
	127	$content =~ s/[,.;]$//;
	128
	129	push @{$symbols{$content}->{file}}, " $file:" . ($ln - 1);
	130
	131	if ($tag =~ m/what/) {
	132	$what .= ", " . $content;
	133	} else {
	134	if ($what) {
	135	parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
	136
	137	foreach my $w(split /, /, $what) {
	138	$symbols{$w}->{xref} = $what;
	139	};
	140	}
	141
	142	$what = $content;
	143	$label = $content;
	144	$new_what = 1;
	145	}
	146	push @labels, [($content, $label)];
	147	$tag = $new_tag;
	148
	149	push @{$data{$nametag}->{symbols}}, $content if ($data{$nametag}->{what});
	150	next;
	151	}
	152
	153	if ($tag ne "" && $new_tag) {
	154	$tag = $new_tag;
	155
	156	if ($new_what) {
	157	@{$data{$what}->{label_list}} = @labels if ($data{$nametag}->{what});
	158	@labels = ();
	159	$label = "";
	160	$new_what = 0;
	161
	162	$data{$what}->{type} = $type;
	163	if (!defined($data{$what}->{file})) {
	164	$data{$what}->{file} = $name;
	165	$data{$what}->{filepath} = $file;
	166	} else {
	167	if ($name ne $data{$what}->{file}) {
	168	$data{$what}->{file} .= " " . $name;
	169	$data{$what}->{filepath} .= " " . $file;
	170	}
	171	}
	172	print STDERR "\twhat: $what\n" if ($debug > 1);
	173	$data{$what}->{line_no} = $ln;
	174	} else {
	175	$data{$what}->{line_no} = $ln if (!defined($data{$what}->{line_no}));
	176	}
	177
	178	if (!$what) {
	179	parse_error($file, $ln, "'What:' should come first:", $_);
	180	next;
	181	}
	182	if ($new_tag eq "description") {
	183	$sep =~ s,:, ,;
	184	$content = ' ' x length($new_tag) . $sep . $content;
	185	while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
	186	if ($content =~ m/^(\s)(\S.)$/) {
	187	# Preserve initial spaces for the first line
	188	$space = $1;
	189	$content = "$2\n";
	190	$data{$what}->{$tag} .= $content;
	191	} else {
	192	undef($space);
	193	}
	194
	195	} else {
	196	$data{$what}->{$tag} = $content;
	197	}
	198	next;
	199	}
	200	}
	201
	202	# Store any contents before tags at the database
	203	if (!$tag && $data{$nametag}->{what}) {
	204	$data{$nametag}->{description} .= $_;
	205	next;
	206	}
	207
	208	if ($tag eq "description") {
	209	my $content = $_;
	210	while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
	211	if (m/^\s*\n/) {
	212	$data{$what}->{$tag} .= "\n";
	213	next;
	214	}
	215
	216	if (!defined($space)) {
	217	# Preserve initial spaces for the first line
	218	if ($content =~ m/^(\s)(\S.)$/) {
	219	$space = $1;
	220	$content = "$2\n";
	221	}
	222	} else {
	223	$space = "" if (!($content =~ s/^($space)//));
	224	}
	225	$data{$what}->{$tag} .= $content;
	226
	227	next;
	228	}
	229	if (m/^\s(.)/) {
	230	$data{$what}->{$tag} .= "\n$1";
	231	$data{$what}->{$tag} =~ s/\n+$//;
	232	next;
	233	}
	234
	235	# Everything else is error
	236	parse_error($file, $ln, "Unexpected content", $_);
	237	}
	238	$data{$nametag}->{description} =~ s/^\n+// if ($data{$nametag}->{description});
	239	if ($what) {
	240	parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
	241
	242	foreach my $w(split /, /,$what) {
	243	$symbols{$w}->{xref} = $what;
	244	};
	245	}
	246	close IN;
	247	}
	248
	249	sub create_labels {
	250	my %labels;
	251
	252	foreach my $what (keys %data) {
	253	next if ($data{$what}->{file} eq "File");
	254
	255	foreach my $p (@{$data{$what}->{label_list}}) {
	256	my ($content, $label) = @{$p};
	257	$label = "abi_" . $label . " ";
	258	$label =~ tr/A-Z/a-z/;
	259
	260	# Convert special chars to "_"
	261	$label =~s/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\xff])/_/g;
	262	$label =~ s,_+,_,g;
	263	$label =~ s,_$,,;
	264
	265	# Avoid duplicated labels
	266	while (defined($labels{$label})) {
	267	my @chars = ("A".."Z", "a".."z");
	268	$label .= $chars[rand @chars];
	269	}
	270	$labels{$label} = 1;
	271
	272	$data{$what}->{label} = $label;
	273
	274	# only one label is enough
	275	last;
	276	}
	277	}
	278	}
	279
	280	#
	281	# Outputs the book on ReST format
	282	#
	283
	284	# \b doesn't work well with paths. So, we need to define something else:
	285	# Boundaries are punct characters, spaces and end-of-line
	286	my $start = qr {(^\|\s\|\() }x;
	287	my $bondary = qr { ([,.:;\)\s]\|\z) }x;
	288	my $xref_match = qr { $start(\/(sys\|config\|proc\|dev\|kvd)\/[^,.:;\)\s]+)$bondary }x;
	289	my $symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x2f\x3a-\x40\x7b-\xff]) }x;
	290
	291	sub output_rest {
	292	create_labels();
	293
	294	my $part = "";
	295
	296	foreach my $what (sort {
	297	($data{$a}->{type} eq "File") cmp ($data{$b}->{type} eq "File") \|\|
	298	$a cmp $b
	299	} keys %data) {
	300	my $type = $data{$what}->{type};
	301
	302	my @file = split / /, $data{$what}->{file};
	303	my @filepath = split / /, $data{$what}->{filepath};
	304
	305	if ($enable_lineno) {
	306	printf "#define LINENO %s%s#%s\n\n",
	307	$prefix, $file[0],
	308	$data{$what}->{line_no};
	309	}
	310
	311	my $w = $what;
	312
	313	if ($type ne "File") {
	314	my $cur_part = $what;
	315	if ($what =~ '/') {
	316	if ($what =~ m#^(\/?(?:[\w\-]+\/?){1,2})#) {
	317	$cur_part = "Symbols under $1";
	318	$cur_part =~ s,/$,,;
	319	}
	320	}
	321
	322	if ($cur_part ne "" && $part ne $cur_part) {
	323	$part = $cur_part;
	324	my $bar = $part;
	325	$bar =~ s/./-/g;
	326	print "$part\n$bar\n\n";
	327	}
	328
	329	printf ".. _%s:\n\n", $data{$what}->{label};
	330
	331	my @names = split /, /,$w;
	332	my $len = 0;
	333
	334	foreach my $name (@names) {
	335	$name =~ s/$symbols/\\$1/g;
	336	$name = "$name";
	337	$len = length($name) if (length($name) > $len);
	338	}
	339
	340	print "+-" . "-" x $len . "-+\n";
	341	foreach my $name (@names) {
	342	printf "\| %s", $name . " " x ($len - length($name)) . " \|\n";
	343	print "+-" . "-" x $len . "-+\n";
	344	}
	345
	346	print "\n";
	347	}
	348
	349	for (my $i = 0; $i < scalar(@filepath); $i++) {
	350	my $path = $filepath[$i];
	351	my $f = $file[$i];
	352
	353	$path =~ s,./(./.*),$1,;;
	354	$path =~ s,[/\-],_,g;;
	355	my $fileref = "abi_file_".$path;
	356
	357	if ($type eq "File") {
	358	print ".. _$fileref:\n\n";
	359	} else {
	360	print "Defined on file :ref:`$f <$fileref>`\n\n";
	361	}
	362	}
	363
	364	if ($type eq "File") {
	365	my $bar = $w;
	366	$bar =~ s/./-/g;
	367	print "$w\n$bar\n\n";
	368	}
	369
	370	my $desc = "";
	371	$desc = $data{$what}->{description} if (defined($data{$what}->{description}));
	372	$desc =~ s/\s+$/\n/;
	373
	374	if (!($desc =~ /^\s*$/)) {
	375	if ($description_is_rst) {
	376	# Remove title markups from the description
	377	# Having titles inside ABI files will only work if extra
	378	# care would be taken in order to strictly follow the same
	379	# level order for each markup.
	380	$desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
	381
	382	# Enrich text by creating cross-references
	383
	384	my $new_desc = "";
	385	open(my $fh, "+<", \$desc);
	386	while (my $d = <$fh>) {
	387	$d =~ s,Documentation/(?!devicetree)(\S+)\.rst,:doc:`/$1`,g;
	388
	389	my @matches = $d =~ m,Documentation/ABI/([\w\/\-]+),g;
	390	foreach my $f (@matches) {
	391	my $xref = $f;
	392	my $path = $f;
	393	$path =~ s,./(./.*),$1,;;
	394	$path =~ s,[/\-],_,g;;
	395	$xref .= " <abi_file_" . $path . ">";
	396	$d =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
	397	}
	398
	399	# Seek for cross reference symbols like /sys/...
	400	@matches = $d =~ m/$xref_match/g;
	401
	402	foreach my $s (@matches) {
	403	next if (!($s =~ m,/,));
	404	if (defined($data{$s}) && defined($data{$s}->{label})) {
	405	my $xref = $s;
	406
	407	$xref =~ s/$symbols/\\$1/g;
	408	$xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";
	409
	410	$d =~ s,$start$s$bondary,$1$xref$2,g;
	411	}
	412	}
	413	$new_desc .= $d;
	414	}
	415	close $fh;
	416
	417
	418	print "$new_desc\n\n";
	419	} else {
	420	$desc =~ s/^\s+//;
	421
	422	# Remove title markups from the description, as they won't work
	423	$desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
	424
	425	if ($desc =~ m/\:\n/ \|\| $desc =~ m/\n[\t ]+/ \|\| $desc =~ m/[\x00-\x08\x0b-\x1f\x7b-\xff]/) {
	426	# put everything inside a code block
	427	$desc =~ s/\n/\n /g;
	428
	429	print "::\n\n";
	430	print " $desc\n\n";
	431	} else {
	432	# Escape any special chars from description
	433	$desc =~s/([\x00-\x08\x0b-\x1f\x21-\x2a\x2d\x2f\x3c-\x40\x5c\x5e-\x60\x7b-\xff])/\\$1/g;
	434	print "$desc\n\n";
	435	}
	436	}
	437	} else {
	438	print "DESCRIPTION MISSING for $what\n\n" if (!$data{$what}->{is_file});
	439	}
	440
	441	if ($data{$what}->{symbols}) {
	442	printf "Has the following ABI:\n\n";
	443
	444	foreach my $content(@{$data{$what}->{symbols}}) {
	445	my $label = $data{$symbols{$content}->{xref}}->{label};
	446
	447	# Escape special chars from content
	448	$content =~s/([\x00-\x1f\x21-\x2f\x3a-\x40\x7b-\xff])/\\$1/g;
	449
	450	print "- :ref:`$content <$label>`\n\n";
	451	}
	452	}
	453
	454	if (defined($data{$what}->{users})) {
	455	my $users = $data{$what}->{users};
	456
	457	$users =~ s/\n/\n\t/g;
	458	printf "Users:\n\t%s\n\n", $users if ($users ne "");
	459	}
	460
	461	}
	462	}
	463
	464	#
	465	# Searches for ABI symbols
	466	#
	467	sub search_symbols {
	468	foreach my $what (sort keys %data) {
	469	next if (!($what =~ m/($arg)/));
	470
	471	my $type = $data{$what}->{type};
	472	next if ($type eq "File");
	473
	474	my $file = $data{$what}->{filepath};
	475
	476	my $bar = $what;
	477	$bar =~ s/./-/g;
	478
	479	print "\n$what\n$bar\n\n";
	480
	481	my $kernelversion = $data{$what}->{kernelversion} if (defined($data{$what}->{kernelversion}));
	482	my $contact = $data{$what}->{contact} if (defined($data{$what}->{contact}));
	483	my $users = $data{$what}->{users} if (defined($data{$what}->{users}));
	484	my $date = $data{$what}->{date} if (defined($data{$what}->{date}));
	485	my $desc = $data{$what}->{description} if (defined($data{$what}->{description}));
	486
	487	$kernelversion =~ s/^\s+// if ($kernelversion);
	488	$contact =~ s/^\s+// if ($contact);
	489	if ($users) {
	490	$users =~ s/^\s+//;
	491	$users =~ s/\n//g;
	492	}
	493	$date =~ s/^\s+// if ($date);
	494	$desc =~ s/^\s+// if ($desc);
	495
	496	printf "Kernel version:\t\t%s\n", $kernelversion if ($kernelversion);
	497	printf "Date:\t\t\t%s\n", $date if ($date);
	498	printf "Contact:\t\t%s\n", $contact if ($contact);
	499	printf "Users:\t\t\t%s\n", $users if ($users);
	500	print "Defined on file(s):\t$file\n\n";
	501	print "Description:\n\n$desc";
	502	}
	503	}
	504
	505	# Ensure that the prefix will always end with a slash
	506	# While this is not needed for find, it makes the patch nicer
	507	# with --enable-lineno
	508	$prefix =~ s,/?$,/,;
	509
	510	#
	511	# Parses all ABI files located at $prefix dir
	512	#
	513	find({wanted =>\&parse_abi, no_chdir => 1}, $prefix);
	514
	515	print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
	516
	517	#
	518	# Handles the command
	519	#
	520	if ($cmd eq "search") {
	521	search_symbols;
	522	} else {
	523	if ($cmd eq "rest") {
	524	output_rest;
	525	}
	526
	527	# Warn about duplicated ABI entries
	528	foreach my $what(sort keys %symbols) {
	529	my @files = @{$symbols{$what}->{file}};
	530
	531	next if (scalar(@files) == 1);
	532
	533	printf STDERR "Warning: $what is defined %d times: @files\n",
	534	scalar(@files);
	535	}
	536	}
	537
	538	__END__
	539
	540	=head1 NAME
	541
	542	abi_book.pl - parse the Linux ABI files and produce a ReST book.
	543
	544	=head1 SYNOPSIS
	545
	546	B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
	547	[--(no-)rst-source] [--dir=<dir>] <COMAND> [<ARGUMENT>]
	548
	549	Where <COMMAND> can be:
	550
	551	=over 8
	552
	553	B<search> [SEARCH_REGEX] - search for [SEARCH_REGEX] inside ABI
	554
	555	B<rest> - output the ABI in ReST markup language
	556
	557	B<validate> - validate the ABI contents
	558
	559	=back
	560
	561	=head1 OPTIONS
	562
	563	=over 8
	564
	565	=item B<--dir>
	566
	567	Changes the location of the ABI search. By default, it uses
	568	the Documentation/ABI directory.
	569
	570	=item B<--rst-source> and B<--no-rst-source>
	571
	572	The input file may be using ReST syntax or not. Those two options allow
	573	selecting between a rst-compliant source ABI (--rst-source), or a
	574	plain text that may be violating ReST spec, so it requres some escaping
	575	logic (--no-rst-source).
	576
	577	=item B<--enable-lineno>
	578
	579	Enable output of #define LINENO lines.
	580
	581	=item B<--debug>
	582
	583	Put the script in verbose mode, useful for debugging. Can be called multiple
	584	times, to increase verbosity.
	585
	586	=item B<--help>
	587
	588	Prints a brief help message and exits.
	589
	590	=item B<--man>
	591
	592	Prints the manual page and exits.
	593
	594	=back
	595
	596	=head1 DESCRIPTION
	597
	598	Parse the Linux ABI files from ABI DIR (usually located at Documentation/ABI),
	599	allowing to search for ABI symbols or to produce a ReST book containing
	600	the Linux ABI documentation.
	601
	602	=head1 EXAMPLES
	603
	604	Search for all stable symbols with the word "usb":
	605
	606	=over 8
	607
	608	$ scripts/get_abi.pl search usb --dir Documentation/ABI/stable
	609
	610	=back
	611
	612	Search for all symbols that match the regex expression "usb.*cap":
	613
	614	=over 8
	615
	616	$ scripts/get_abi.pl search usb.*cap
	617
	618	=back
	619
	620	Output all obsoleted symbols in ReST format
	621
	622	=over 8
	623
	624	$ scripts/get_abi.pl rest --dir Documentation/ABI/obsolete
	625
	626	=back
	627
	628	=head1 BUGS
	629
	630	Report bugs to Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
	631
	632	=head1 COPYRIGHT
	633
	634	Copyright (c) 2016-2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
	635
	636	License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
	637
	638	This is free software: you are free to change and redistribute it.
	639	There is NO WARRANTY, to the extent permitted by law.
	640
	641	=cut