browser: store only changed values in version support

[sheet.git] / tools / mkcaniuse

diff --git a/tools/mkcaniuse b/tools/mkcaniuse
index 65fcec3da92bc3784c1e5444e0ae6d9eed5d4b6a..b162c2f3f1d521ea8fb536f39b980963e7e56ccb 100755 (executable)
--- a/tools/mkcaniuse
+++ b/tools/mkcaniuse
@@ -6,8 +6,9 @@ use Data::Dump 'pp';
 use JSON::PP;
 use File::stat;
 use Time::Piece;
+use List::Util 'uniq';
 
-our $VERSION = '1.02';
+our $VERSION = '1.04';
 
 my %BROWSERJOIN = (
        edge    => 'ie',
@@ -21,9 +22,8 @@ $JSON::PP::false = 0;
 $JSON::PP::true  = 1;
 
 my $data = decode_json($source);
-my $update = eval { stat(${^LAST_FH} // $ARGV)->mtime }
-       or warn "Could not determine input time\n";
-$data->{-date} = Time::Piece->new($update)->datetime;
+$data->{-date} = Time::Piece->new($_)->datetime
+       for delete $data->{updated} || ();
 
 delete $data->{eras};
 for (values %{ $data->{data} }) {
@@ -31,13 +31,16 @@ for (values %{ $data->{data} }) {
 }
 for (values %{ $data->{agents} }) {
        delete $_->{usage_global};
-       shift @{ $_->{versions} } while !defined $_->{versions}->[0];
+       for (@{ $_->{version_list} }) {
+               delete $_->{era};
+               delete $_->{prefix} unless $_->{prefix};
+       }
 }
 
 while (my ($browser, $target) = each %BROWSERJOIN) {
        my $agent1 = delete $data->{agents}->{$browser} or next;
        my $agent2 =        $data->{agents}->{$target}  or next;
-       splice @{ $agent2->{versions} }, -3, 3, @{ $agent1->{versions} };
+       push @{ $agent2->{version_list} }, @{ $agent1->{version_list} };
        $agent2->{browser} = sprintf '%s (former %s)',
                $agent1->{browser}, $agent2->{browser};
 
@@ -47,6 +50,32 @@ while (my ($browser, $target) = each %BROWSERJOIN) {
        }
 }
 
+for my $feature (values %{ $data->{data} }) {
+       while (my ($attr, $row) = each %{$feature}) {
+               delete $feature->{$attr} if ref $row eq '' and $row eq '';
+       }
+}
+
+while (my ($agent, $row) = each %{ $data->{agents} }) {
+       $row->{versions} = [ uniq map { $_->{version} } @{ $row->{version_list} } ];
+
+       # omit identical values from subsequent versions
+       for my $feature (values %{ $data->{data} }) {
+               my $cmp;  # same value to be omitted
+               my $verstats = $feature->{stats}->{$agent};
+               for my $version (@{ $row->{versions} }) {
+                       defined $verstats->{$version}
+                               or warn "missing feature $feature->{title} for $agent $version";
+                       if (defined $cmp and $verstats->{$version} eq $cmp) {
+                               delete $verstats->{$version};
+                       }
+                       else {
+                               $cmp = $verstats->{$version};
+                       }
+               }
+       }
+}
+
 say "# automatically generated by $0";
 print '+', pp($data);