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+# Copyright © 1996 Ian Jackson
+# Copyright © 2005 Frank Lichtenheld <frank@lichtenheld.de>
+# Copyright © 2009 Raphaël Hertzog <hertzog@debian.org>
+# Copyright © 2012-2017 Guillem Jover <guillem@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Changelog::Debian - parse Debian changelogs
+
+=head1 DESCRIPTION
+
+This class represents a Debian changelog file as an array of changelog
+entries (Dpkg::Changelog::Entry::Debian).
+It implements the generic interface Dpkg::Changelog.
+Only methods specific to this implementation are described below,
+the rest are inherited.
+
+Dpkg::Changelog::Debian parses Debian changelogs as described in
+deb-changelog(5).
+
+The parser tries to ignore most cruft like # or /* */ style comments,
+RCS keywords, Vim modelines, Emacs local variables and stuff from
+older changelogs with other formats at the end of the file.
+NOTE: most of these are ignored silently currently, there is no
+parser error issued for them. This should become configurable in the
+future.
+
+=cut
+
+package Dpkg::Changelog::Debian;
+
+use strict;
+use warnings;
+
+our $VERSION = '1.00';
+
+use Dpkg::Gettext;
+use Dpkg::File;
+use Dpkg::Changelog qw(:util);
+use Dpkg::Changelog::Entry::Debian qw(match_header match_trailer);
+
+use parent qw(Dpkg::Changelog);
+
+use constant {
+ FIRST_HEADING => g_('first heading'),
+ NEXT_OR_EOF => g_('next heading or end of file'),
+ START_CHANGES => g_('start of change data'),
+ CHANGES_OR_TRAILER => g_('more change data or trailer'),
+};
+
+my $ancient_delimiter_re = qr{
+ ^
+ (?: # Ancient GNU style changelog entry with expanded date
+ (?:
+ \w+\s+ # Day of week (abbreviated)
+ \w+\s+ # Month name (abbreviated)
+ \d{1,2} # Day of month
+ \Q \E
+ \d{1,2}:\d{1,2}:\d{1,2}\s+ # Time
+ [\w\s]* # Timezone
+ \d{4} # Year
+ )
+ \s+
+ (?:.*) # Maintainer name
+ \s+
+ [<\(]
+ (?:.*) # Maintainer email
+ [\)>]
+ | # Old GNU style changelog entry with expanded date
+ (?:
+ \w+\s+ # Day of week (abbreviated)
+ \w+\s+ # Month name (abbreviated)
+ \d{1,2},?\s* # Day of month
+ \d{4} # Year
+ )
+ \s+
+ (?:.*) # Maintainer name
+ \s+
+ [<\(]
+ (?:.*) # Maintainer email
+ [\)>]
+ | # Ancient changelog header w/o key=value options
+ (?:\w[-+0-9a-z.]*) # Package name
+ \Q \E
+ \(
+ (?:[^\(\) \t]+) # Package version
+ \)
+ \;?
+ | # Ancient changelog header
+ (?:[\w.+-]+) # Package name
+ [- ]
+ (?:\S+) # Package version
+ \ Debian
+ \ (?:\S+) # Package revision
+ |
+ Changes\ from\ version\ (?:.*)\ to\ (?:.*):
+ |
+ Changes\ for\ [\w.+-]+-[\w.+-]+:?\s*$
+ |
+ Old\ Changelog:\s*$
+ |
+ (?:\d+:)?
+ \w[\w.+~-]*:?
+ \s*$
+ )
+}xi;
+
+=head1 METHODS
+
+=over 4
+
+=item $count = $c->parse($fh, $description)
+
+Read the filehandle and parse a Debian changelog in it, to store the entries
+as an array of Dpkg::Changelog::Entry::Debian objects.
+Any previous entries in the object are reset before parsing new data.
+
+Returns the number of changelog entries that have been parsed with success.
+
+=cut
+
+sub parse {
+ my ($self, $fh, $file) = @_;
+ $file = $self->{reportfile} if exists $self->{reportfile};
+
+ $self->reset_parse_errors;
+
+ $self->{data} = [];
+ $self->set_unparsed_tail(undef);
+
+ my $expect = FIRST_HEADING;
+ my $entry = Dpkg::Changelog::Entry::Debian->new();
+ my @blanklines = ();
+ # To make version unique, for example for using as id.
+ my $unknowncounter = 1;
+ local $_;
+
+ while (<$fh>) {
+ chomp;
+ if (match_header($_)) {
+ unless ($expect eq FIRST_HEADING || $expect eq NEXT_OR_EOF) {
+ $self->parse_error($file, $.,
+ sprintf(g_('found start of entry where expected %s'),
+ $expect), "$_");
+ }
+ unless ($entry->is_empty) {
+ push @{$self->{data}}, $entry;
+ $entry = Dpkg::Changelog::Entry::Debian->new();
+ last if $self->abort_early();
+ }
+ $entry->set_part('header', $_);
+ foreach my $error ($entry->parse_header()) {
+ $self->parse_error($file, $., $error, $_);
+ }
+ $expect = START_CHANGES;
+ @blanklines = ();
+ } elsif (m/^(?:;;\s*)?Local variables:/io) {
+ # Save any trailing Emacs variables at end of file.
+ $self->set_unparsed_tail("$_\n" . (file_slurp($fh) // ''));
+ last;
+ } elsif (m/^vim:/io) {
+ # Save any trailing Vim modelines at end of file.
+ $self->set_unparsed_tail("$_\n" . (file_slurp($fh) // ''));
+ last;
+ } elsif (m/^\$\w+:.*\$/o) {
+ next; # skip stuff that look like a RCS keyword
+ } elsif (m/^\# /o) {
+ next; # skip comments, even that's not supported
+ } elsif (m{^/\*.*\*/}o) {
+ next; # more comments
+ } elsif (m/$ancient_delimiter_re/) {
+ # save entries on old changelog format verbatim
+ # we assume the rest of the file will be in old format once we
+ # hit it for the first time
+ $self->set_unparsed_tail("$_\n" . file_slurp($fh));
+ } elsif (m/^\S/) {
+ $self->parse_error($file, $., g_('badly formatted heading line'), "$_");
+ } elsif (match_trailer($_)) {
+ unless ($expect eq CHANGES_OR_TRAILER) {
+ $self->parse_error($file, $.,
+ sprintf(g_('found trailer where expected %s'), $expect), "$_");
+ }
+ $entry->set_part('trailer', $_);
+ $entry->extend_part('blank_after_changes', [ @blanklines ]);
+ @blanklines = ();
+ foreach my $error ($entry->parse_trailer()) {
+ $self->parse_error($file, $., $error, $_);
+ }
+ $expect = NEXT_OR_EOF;
+ } elsif (m/^ \-\-/) {
+ $self->parse_error($file, $., g_('badly formatted trailer line'), "$_");
+ } elsif (m/^\s{2,}(?:\S)/) {
+ unless ($expect eq START_CHANGES or $expect eq CHANGES_OR_TRAILER) {
+ $self->parse_error($file, $., sprintf(g_('found change data' .
+ ' where expected %s'), $expect), "$_");
+ if ($expect eq NEXT_OR_EOF and not $entry->is_empty) {
+ # lets assume we have missed the actual header line
+ push @{$self->{data}}, $entry;
+ $entry = Dpkg::Changelog::Entry::Debian->new();
+ $entry->set_part('header', 'unknown (unknown' . ($unknowncounter++) . ') unknown; urgency=unknown');
+ }
+ }
+ # Keep raw changes
+ $entry->extend_part('changes', [ @blanklines, $_ ]);
+ @blanklines = ();
+ $expect = CHANGES_OR_TRAILER;
+ } elsif (!m/\S/) {
+ if ($expect eq START_CHANGES) {
+ $entry->extend_part('blank_after_header', $_);
+ next;
+ } elsif ($expect eq NEXT_OR_EOF) {
+ $entry->extend_part('blank_after_trailer', $_);
+ next;
+ } elsif ($expect ne CHANGES_OR_TRAILER) {
+ $self->parse_error($file, $.,
+ sprintf(g_('found blank line where expected %s'), $expect));
+ }
+ push @blanklines, $_;
+ } else {
+ $self->parse_error($file, $., g_('unrecognized line'), "$_");
+ unless ($expect eq START_CHANGES or $expect eq CHANGES_OR_TRAILER) {
+ # lets assume change data if we expected it
+ $entry->extend_part('changes', [ @blanklines, $_]);
+ @blanklines = ();
+ $expect = CHANGES_OR_TRAILER;
+ }
+ }
+ }
+
+ unless ($expect eq NEXT_OR_EOF) {
+ $self->parse_error($file, $.,
+ sprintf(g_('found end of file where expected %s'),
+ $expect));
+ }
+ unless ($entry->is_empty) {
+ push @{$self->{data}}, $entry;
+ }
+
+ return scalar @{$self->{data}};
+}
+
+1;
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 1.00 (dpkg 1.15.6)
+
+Mark the module as public.
+
+=head1 SEE ALSO
+
+Dpkg::Changelog
+
+=cut
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