1 files changed, 146 insertions, 0 deletions
diff --git a/scripts/Dpkg/BuildProfiles.pm b/scripts/Dpkg/BuildProfiles.pm
new file mode 100644
index 0000000..df3ec48
--- /dev/null
+++ b/scripts/Dpkg/BuildProfiles.pm
@@ -0,0 +1,146 @@
+# Copyright © 2013 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::BuildProfiles;
+
+use strict;
+use warnings;
+
+our $VERSION = '1.00';
+our @EXPORT_OK = qw(
+    get_build_profiles
+    set_build_profiles
+    parse_build_profiles
+    evaluate_restriction_formula
+);
+
+use Exporter qw(import);
+use List::Util qw(any);
+
+use Dpkg::BuildEnv;
+
+my $cache_profiles;
+my @build_profiles;
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::BuildProfiles - handle build profiles
+
+=head1 DESCRIPTION
+
+The Dpkg::BuildProfiles module provides functions to handle the build
+profiles.
+
+=head1 FUNCTIONS
+
+=over 4
+
+=item @profiles = get_build_profiles()
+
+Get an array with the currently active build profiles, taken from
+the environment variable B<DEB_BUILD_PROFILES>.
+
+=cut
+
+sub get_build_profiles {
+    return @build_profiles if $cache_profiles;
+
+    if (Dpkg::BuildEnv::has('DEB_BUILD_PROFILES')) {
+        @build_profiles = split ' ', Dpkg::BuildEnv::get('DEB_BUILD_PROFILES');
+    }
+    $cache_profiles = 1;
+
+    return @build_profiles;
+}
+
+=item set_build_profiles(@profiles)
+
+Set C<@profiles> as the current active build profiles, by setting
+the environment variable B<DEB_BUILD_PROFILES>.
+
+=cut
+
+sub set_build_profiles {
+    my (@profiles) = @_;
+
+    $cache_profiles = 1;
+    @build_profiles = @profiles;
+    Dpkg::BuildEnv::set('DEB_BUILD_PROFILES', join ' ', @profiles);
+}
+
+=item @profiles = parse_build_profiles($string)
+
+Parses a build profiles specification, into an array of array references.
+
+=cut
+
+sub parse_build_profiles {
+    my $string = shift;
+
+    $string =~ s/^\s*<\s*(.*)\s*>\s*$/$1/;
+
+    return map { [ split ' ' ] } split /\s*>\s+<\s*/, $string;
+}
+
+=item evaluate_restriction_formula(\@formula, \@profiles)
+
+Evaluate whether a restriction formula of the form "<foo bar> <baz>", given as
+a nested array, is true or false, given the array of enabled build profiles.
+
+=cut
+
+sub evaluate_restriction_formula {
+    my ($formula, $profiles) = @_;
+
+    # Restriction formulas are in disjunctive normal form:
+    # (foo AND bar) OR (blub AND bla)
+    foreach my $restrlist (@{$formula}) {
+        my $seen_profile = 1;
+
+        foreach my $restriction (@$restrlist) {
+            next if $restriction !~ m/^(!)?(.+)/;
+
+            my $negated = defined $1 && $1 eq '!';
+            my $profile = $2;
+            my $found = any { $_ eq $profile } @{$profiles};
+
+            # If a negative set profile is encountered, stop processing.
+            # If a positive unset profile is encountered, stop processing.
+            if ($found == $negated) {
+                $seen_profile = 0;
+                last;
+            }
+        }
+
+        # This conjunction evaluated to true so we don't have to evaluate
+        # the others.
+        return 1 if $seen_profile;
+    }
+    return 0;
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 1.00 (dpkg 1.17.17)
+
+Mark the module as public.
+
+=cut
+
+1;