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+# 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/>.
+
+package Dpkg::Index;
+
+use strict;
+use warnings;
+
+our $VERSION = '3.00';
+
+use Dpkg::Gettext;
+use Dpkg::ErrorHandling;
+use Dpkg::Control;
+
+use parent qw(Dpkg::Interface::Storable);
+
+use overload
+ '@{}' => sub { return $_[0]->{order} },
+ fallback => 1;
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Index - generic index of control information
+
+=head1 DESCRIPTION
+
+This class represent a set of Dpkg::Control objects.
+
+=head1 METHODS
+
+=over 4
+
+=item $index = Dpkg::Index->new(%opts)
+
+Creates a new empty index. See set_options() for more details.
+
+=cut
+
+sub new {
+ my ($this, %opts) = @_;
+ my $class = ref($this) || $this;
+
+ my $self = {
+ items => {},
+ order => [],
+ unique_tuple_key => 1,
+ get_key_func => sub { return $_[0]->{Package} },
+ type => CTRL_UNKNOWN,
+ item_opts => {},
+ };
+ bless $self, $class;
+ $self->set_options(%opts);
+ if (exists $opts{load}) {
+ $self->load($opts{load});
+ }
+
+ return $self;
+}
+
+=item $index->set_options(%opts)
+
+The "type" option is checked first to define default values for other
+options. Here are the relevant options: "get_key_func" is a function
+returning a key for the item passed in parameters, "unique_tuple_key" is
+a boolean requesting whether the default key should be the unique tuple
+(default to true), "item_opts" is a hash reference that will be passed to
+the item constructor in the new_item() method.
+The index can only contain one item with a given key.
+The "get_key_func" function used depends on the type:
+
+=over
+
+=item *
+
+for CTRL_INFO_SRC, it is the Source field;
+
+=item *
+
+for CTRL_INDEX_SRC and CTRL_PKG_SRC it is the Package and Version fields
+(concatenated with "_") when "unique_tuple_key" is true (the default), or
+otherwise the Package field;
+
+=item *
+
+for CTRL_INFO_PKG it is simply the Package field;
+
+=item *
+
+for CTRL_INDEX_PKG and CTRL_PKG_DEB it is the Package, Version and
+Architecture fields (concatenated with "_") when "unique_tuple_key" is
+true (the default) or otherwise the Package field;
+
+=item *
+
+for CTRL_CHANGELOG it is the Source and the Version fields (concatenated
+with an intermediary "_");
+
+=item *
+
+for CTRL_TESTS is an integer index (0-based) corresponding to the Tests or
+Test-Command field stanza;
+
+=item *
+
+for CTRL_FILE_CHANGES it is the Source, Version and Architecture fields
+(concatenated with "_");
+
+=item *
+
+for CTRL_FILE_VENDOR it is the Vendor field;
+
+=item *
+
+for CTRL_FILE_STATUS it is the Package and Architecture fields (concatenated
+with "_");
+
+=item *
+
+otherwise it is the Package field by default.
+
+=back
+
+=cut
+
+sub set_options {
+ my ($self, %opts) = @_;
+
+ # Default values based on type
+ if (exists $opts{type}) {
+ my $t = $opts{type};
+ if ($t == CTRL_INFO_PKG) {
+ $self->{get_key_func} = sub { return $_[0]->{Package}; };
+ } elsif ($t == CTRL_INFO_SRC) {
+ $self->{get_key_func} = sub { return $_[0]->{Source}; };
+ } elsif ($t == CTRL_CHANGELOG) {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Source} . '_' . $_[0]->{Version};
+ };
+ } elsif ($t == CTRL_COPYRIGHT_HEADER) {
+ # This is a bit pointless, because the value will almost always
+ # be the same, but guarantees that we use a known field.
+ $self->{get_key_func} = sub { return $_[0]->{Format}; };
+ } elsif ($t == CTRL_COPYRIGHT_FILES) {
+ $self->{get_key_func} = sub { return $_[0]->{Files}; };
+ } elsif ($t == CTRL_COPYRIGHT_LICENSE) {
+ $self->{get_key_func} = sub { return $_[0]->{License}; };
+ } elsif ($t == CTRL_TESTS) {
+ $self->{get_key_func} = sub {
+ return scalar @{$self->{order}};
+ };
+ } elsif ($t == CTRL_INDEX_SRC or $t == CTRL_PKG_SRC) {
+ if ($opts{unique_tuple_key} // $self->{unique_tuple_key}) {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Package} . '_' . $_[0]->{Version};
+ };
+ } else {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Package};
+ };
+ }
+ } elsif ($t == CTRL_INDEX_PKG or $t == CTRL_PKG_DEB) {
+ if ($opts{unique_tuple_key} // $self->{unique_tuple_key}) {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Package} . '_' . $_[0]->{Version} . '_' .
+ $_[0]->{Architecture};
+ };
+ } else {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Package};
+ };
+ }
+ } elsif ($t == CTRL_FILE_CHANGES) {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Source} . '_' . $_[0]->{Version} . '_' .
+ $_[0]->{Architecture};
+ };
+ } elsif ($t == CTRL_FILE_VENDOR) {
+ $self->{get_key_func} = sub { return $_[0]->{Vendor}; };
+ } elsif ($t == CTRL_FILE_STATUS) {
+ $self->{get_key_func} = sub {
+ return $_[0]->{Package} . '_' . $_[0]->{Architecture};
+ };
+ }
+ }
+
+ # Options set by the user override default values
+ $self->{$_} = $opts{$_} foreach keys %opts;
+}
+
+=item $index->get_type()
+
+Returns the type of control information stored. See the type parameter
+set during new().
+
+=cut
+
+sub get_type {
+ my $self = shift;
+ return $self->{type};
+}
+
+=item $index->add($item, [$key])
+
+Add a new item in the index. If the $key parameter is omitted, the key
+will be generated with the get_key_func function (see set_options() for
+details).
+
+=cut
+
+sub add {
+ my ($self, $item, $key) = @_;
+
+ $key //= $self->{get_key_func}($item);
+ if (not exists $self->{items}{$key}) {
+ push @{$self->{order}}, $key;
+ }
+ $self->{items}{$key} = $item;
+}
+
+=item $index->parse($fh, $desc)
+
+Reads the filehandle and creates all items parsed. When called multiple
+times, the parsed stanzas are accumulated.
+
+Returns the number of items parsed.
+
+=cut
+
+sub parse {
+ my ($self, $fh, $desc) = @_;
+ my $item = $self->new_item();
+ my $i = 0;
+ while ($item->parse($fh, $desc)) {
+ $self->add($item);
+ $item = $self->new_item();
+ $i++;
+ }
+ return $i;
+}
+
+=item $index->load($file)
+
+Reads the file and creates all items parsed. Returns the number of items
+parsed. Handles compressed files transparently based on their extensions.
+
+=item $item = $index->new_item()
+
+Creates a new item. Mainly useful for derived objects that would want
+to override this method to return something else than a Dpkg::Control
+object.
+
+=cut
+
+sub new_item {
+ my $self = shift;
+ return Dpkg::Control->new(%{$self->{item_opts}}, type => $self->{type});
+}
+
+=item $item = $index->get_by_key($key)
+
+Returns the item identified by $key or undef.
+
+=cut
+
+sub get_by_key {
+ my ($self, $key) = @_;
+ return $self->{items}{$key} if exists $self->{items}{$key};
+ return;
+}
+
+=item @keys = $index->get_keys(%criteria)
+
+Returns the keys of items that matches all the criteria. The key of the
+%criteria hash is a field name and the value is either a regex that needs
+to match the field value, or a reference to a function that must return
+true and that receives the field value as single parameter, or a scalar
+that must be equal to the field value.
+
+=cut
+
+sub get_keys {
+ my ($self, %crit) = @_;
+ my @selected = @{$self->{order}};
+ foreach my $s_crit (keys %crit) { # search criteria
+ if (ref($crit{$s_crit}) eq 'Regexp') {
+ @selected = grep {
+ exists $self->{items}{$_}{$s_crit} and
+ $self->{items}{$_}{$s_crit} =~ $crit{$s_crit}
+ } @selected;
+ } elsif (ref($crit{$s_crit}) eq 'CODE') {
+ @selected = grep {
+ $crit{$s_crit}->($self->{items}{$_}{$s_crit});
+ } @selected;
+ } else {
+ @selected = grep {
+ exists $self->{items}{$_}{$s_crit} and
+ $self->{items}{$_}{$s_crit} eq $crit{$s_crit}
+ } @selected;
+ }
+ }
+ return @selected;
+}
+
+=item @items = $index->get(%criteria)
+
+Returns all the items that matches all the criteria.
+
+=cut
+
+sub get {
+ my ($self, %crit) = @_;
+ return map { $self->{items}{$_} } $self->get_keys(%crit);
+}
+
+=item $index->remove_by_key($key)
+
+Remove the item identified by the given key.
+
+=cut
+
+sub remove_by_key {
+ my ($self, $key) = @_;
+ @{$self->{order}} = grep { $_ ne $key } @{$self->{order}};
+ return delete $self->{items}{$key};
+}
+
+=item @items = $index->remove(%criteria)
+
+Returns and removes all the items that matches all the criteria.
+
+=cut
+
+sub remove {
+ my ($self, %crit) = @_;
+ my @keys = $self->get_keys(%crit);
+ my (%keys, @ret);
+ foreach my $key (@keys) {
+ $keys{$key} = 1;
+ push @ret, $self->{items}{$key} if defined wantarray;
+ delete $self->{items}{$key};
+ }
+ @{$self->{order}} = grep { not exists $keys{$_} } @{$self->{order}};
+ return @ret;
+}
+
+=item $index->merge($other_index, %opts)
+
+Merge the entries of the other index. While merging, the keys of the merged
+index are used, they are not re-computed (unless you have set the options
+"keep_keys" to "0"). It's your responsibility to ensure that they have been
+computed with the same function.
+
+=cut
+
+sub merge {
+ my ($self, $other, %opts) = @_;
+ $opts{keep_keys} //= 1;
+ foreach my $key ($other->get_keys()) {
+ $self->add($other->get_by_key($key), $opts{keep_keys} ? $key : undef);
+ }
+}
+
+=item $index->sort(\&sortfunc)
+
+Sort the index with the given sort function. If no function is given, an
+alphabetic sort is done based on the keys. The sort function receives the
+items themselves as parameters and not the keys.
+
+=cut
+
+sub sort {
+ my ($self, $func) = @_;
+ if (defined $func) {
+ @{$self->{order}} = sort {
+ $func->($self->{items}{$a}, $self->{items}{$b})
+ } @{$self->{order}};
+ } else {
+ @{$self->{order}} = sort @{$self->{order}};
+ }
+}
+
+=item $str = $index->output([$fh])
+
+=item "$index"
+
+Get a string representation of the index. The L<Dpkg::Control> objects are
+output in the order which they have been read or added except if the order
+have been changed with sort().
+
+Print the string representation of the index to a filehandle if $fh has
+been passed.
+
+=cut
+
+sub output {
+ my ($self, $fh) = @_;
+ my $str = '';
+ foreach my $key ($self->get_keys()) {
+ if (defined $fh) {
+ print { $fh } $self->get_by_key($key) . "\n";
+ }
+ if (defined wantarray) {
+ $str .= $self->get_by_key($key) . "\n";
+ }
+ }
+ return $str;
+}
+
+=item $index->save($file)
+
+Writes the content of the index in a file. Auto-compresses files
+based on their extensions.
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 3.00 (dpkg 1.21.2)
+
+Change behavior: The CTRL_TESTS key now defaults to a stanza index.
+
+=head2 Version 2.01 (dpkg 1.20.6)
+
+New option: Add new "item_opts" option.
+
+=head2 Version 2.00 (dpkg 1.20.0)
+
+Change behavior: The "unique_tuple_key" option now defaults to true.
+
+=head2 Version 1.01 (dpkg 1.19.0)
+
+New option: Add new "unique_tuple_key" option to $index->set_options() to set
+better default "get_key_func" options, which will become the default behavior
+in 1.20.x.
+
+=head2 Version 1.00 (dpkg 1.15.6)
+
+Mark the module as public.
+
+=cut
+
+1;
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