+sub accept_language {
+ # referenced http://search.cpan.org/src/CGILMORE/I18N-AcceptLanguage-1.04/lib/I18N/AcceptLanguage.pm
+ my ($clientPreferences,$supportedLanguages) = @_;
+ my @languages = ();
+ if ($clientPreferences) {
+ # There should be no whitespace anways, but a cleanliness/sanity check
+ $clientPreferences =~ s/\s//g;
+ # Prepare the list of client-acceptable languages
+ foreach my $tag (split(/,/, $clientPreferences)) {
+ my ($language, $quality) = split(/\;/, $tag);
+ $quality =~ s/^q=//i if $quality;
+ $quality = 1 unless $quality;
+ next if $quality <= 0;
+ # We want to force the wildcard to be last
+ $quality = 0 if ($language eq '*');
+ # Pushing lowercase language here saves processing later
+ push(@languages, { quality => $quality,
+ language => $language,
+ lclanguage => lc($language) });
+ }
+ } else {
+ carp "accept_language(x,y) called with no clientPreferences (x).";
+ }
+ # Prepare the list of server-supported languages
+ my %supportedLanguages = ();
+ my %secondaryLanguages = ();
+ foreach my $language (@$supportedLanguages) {
+ # warn "Language supported: " . $language->{language};
+ my $subtag = $language->{rfc4646_subtag};
+ $supportedLanguages{lc($subtag)} = $subtag;
+ if ( $subtag =~ /^([^-]+)-?/ ) {
+ $secondaryLanguages{lc($1)} = $subtag;
+ }
+ }
+
+ # Reverse sort the list, making best quality at the front of the array
+ @languages = sort { $b->{quality} <=> $a->{quality} } @languages;
+ my $secondaryMatch = '';
+ foreach my $tag (@languages) {
+ if (exists($supportedLanguages{$tag->{lclanguage}})) {
+ # Client en-us eq server en-us
+ return $supportedLanguages{$tag->{language}} if exists($supportedLanguages{$tag->{language}});
+ return $supportedLanguages{$tag->{lclanguage}};
+ } elsif (exists($secondaryLanguages{$tag->{lclanguage}})) {
+ # Client en eq server en-us
+ return $secondaryLanguages{$tag->{language}} if exists($secondaryLanguages{$tag->{language}});
+ return $supportedLanguages{$tag->{lclanguage}};
+ } elsif ($tag->{lclanguage} =~ /^([^-]+)-/ && exists($secondaryLanguages{$1}) && $secondaryMatch eq '') {
+ # Client en-gb eq server en-us
+ $secondaryMatch = $secondaryLanguages{$1};
+ } elsif ($tag->{lclanguage} =~ /^([^-]+)-/ && exists($secondaryLanguages{$1}) && $secondaryMatch eq '') {
+ # FIXME: We just checked the exact same conditional!
+ # Client en-us eq server en
+ $secondaryMatch = $supportedLanguages{$1};
+ } elsif ($tag->{lclanguage} eq '*') {
+ # * matches every language not already specified.
+ # It doesn't care which we pick, so let's pick the default,
+ # if available, then the first in the array.
+ #return $acceptor->defaultLanguage() if $acceptor->defaultLanguage();
+ return $supportedLanguages->[0];
+ }
+ }
+ # No primary matches. Secondary? (ie, en-us requested and en supported)
+ return $secondaryMatch if $secondaryMatch;
+ return undef; # else, we got nothing.
+}