From: Mischa POSLAWSKY <perl@shiar.org>
Date: Wed, 10 Nov 2010 00:08:13 +0000 (+0100)
Subject: browser: calculate/order by support score
X-Git-Tag: v1.4~119
X-Git-Url: http://git.shiar.nl/sheet.git/commitdiff_plain/767fa1a306e3c4aa810024de9c2b2c9c30dbca0b?hp=36e1441fd2e594b24504b85e214b19616d9f1d4f

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 49c3ec2..7d78670 100644
--- a/browser.plp
+++ b/browser.plp
@@ -80,7 +80,33 @@ print '<tr>';
 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;
@@ -102,6 +128,7 @@ for my $id (keys %{ $caniuse->{data} }) {
 			$prev = $ver;
 		}
 	}
+	print '<td>', int featurerank($id);
 }
 print '</table>';