browser: calculate/order by support score

Similar to caniuse.com ranking, but points are halved for each consecutive
earlier browser version (future browsers are treated as older than current),
so a browser can never obtain more than 20 points regardless of the amount
of columns shown.

diff --git a/browser.plp b/browser.plp
index 49c3ec2307c4cfe5b6d9f80bcd59f5ab2465173a..7d78670255463e64223d93a4307474768c322f72 100644 (file)
--- a/browser.plp
+++ b/browser.plp
@@ -80,7 +80,33 @@ print '<tr>';
 print '<td>' x $_ for 2, map { scalar @{ $versions{$_} } } @browsers;
 print "</thead>\n";
 
 print '<td>' x $_ for 2, map { scalar @{ $versions{$_} } } @browsers;
 print "</thead>\n";
 

-for my $id (keys %{ $caniuse->{data} }) {
+sub featurerank {
+       # relative amount of support for given feature
+       state $statspts = { y=>10, 'y x'=>9, a=>5, j=>2, p=>1 };
+       my ($id) = @_;
+       my $rank = 0;
+       if (my $row = $caniuse->{data}->{$id}->{stats}) {
+               while (my ($browser, $vercols) = each %versions) {
+                       my $div = 0;  # multiplier exponent (decreased to lower value)
+                       my @vers = map { $row->{$browser}->{$_} } @$vercols;
+                       if (my $current = $caniuse->{agents}->{$browser}->{versions}->[-3]) {
+                               my @future;  # find upcoming releases (after current)
+                               for (reverse @$vercols) {
+                                       last if $_ eq $current;
+                                       push @future, pop @vers;
+                                       $_ eq 'u' and $_ = $vers[-1] for $future[-1];  # inherit latest value if unknown
+                               }
+                               splice @vers, -1, 0, @future;  # move ahead to decrease precedence
+                       }
+                       $rank += $statspts->{$_} * 2**($div--) for reverse @vers;
+               }
+       }
+       return $rank;
+}
+
+for my $id (sort {
+       featurerank($b) <=> featurerank($a)
+} keys %{ $caniuse->{data} }) {

        my $row = $caniuse->{data}->{$id};
        my $data = $row->{stats} or next;  # skip metadata [summary]
        printf '<tr id="%s">', $id;
        my $row = $caniuse->{data}->{$id};
        my $data = $row->{stats} or next;  # skip metadata [summary]
        printf '<tr id="%s">', $id;


@@ -102,6 +128,7 @@ for my $id (keys %{ $caniuse->{data} }) {
                        $prev = $ver;
                }
        }
                        $prev = $ver;
                }
        }

+       print '<td>', int featurerank($id);

 }
 print '</table>';
 
 }
 print '</table>';