digraphs: smart deprecation of xorg alternates

[sheet.git] / digraphs.plp

diff --git a/digraphs.plp b/digraphs.plp
index 1522bf4516986ef866cf58240504cf230e982475..718915dab4ed935c213ddefd96709ebf5bec7d2c 100644 (file)
--- a/digraphs.plp
+++ b/digraphs.plp
@@ -1,4 +1,5 @@
 <(common.inc.plp)><:
+use 5.010;  # state
 
 Html({
        title => 'digraph cheat sheet',
@@ -45,9 +46,29 @@ if (exists $get{xorg}) {
        my $xorg = do 'data/digraphs-xorg.inc.pl'
                or die "Error loading Xorg data: ", $@ // $!;
        $_ = [ord $_] for values %{$xorg};
-       $xorg->{$_}->[2] =  # class = same as rfc | any other spec | xorg only
-               $di->{$_} ? $di->{$_}->[2] =~ /\bu-di\b/ ? 'l5' : 'l3' : 'l1'
+       $xorg->{$_}->[2] = # class = compatibility
+               $di->{$_} ? $di->{$_}->[0] != $xorg->{$_}->[0] ? 'l1' :  # conflict
+               $di->{$_}->[2] =~ /\bu-di\b/ ? 'l5' : 'l3' : 'l2'  # rfc|any|none
                for keys %{$xorg};
+
+       for my $cp (map {$_->[0]} values %{$xorg}) {
+               next if (state $seen = {})->{$cp}++;  # List::MoreUtils::uniq
+
+               # find multiple equivalent mnemonics
+               my @equiv = grep {$cp eq $_->[0]}
+                       map {$xorg->{$_}} sort keys %{$xorg}; # values ordered by mnem.
+
+               # search for the most compatible match
+               my ($compat) = sort {
+                       $equiv[$b]->[2] cmp $equiv[$a]->[2]  # highest level
+                       || $b <=> $a  # fallback to last mnemonic
+               } 0 .. $#equiv;
+
+               # reclassify all but one as level 0 (omitted)
+               splice @equiv, $compat // -1, 1, ();
+               $_->[2] = 'l0 ex' for @equiv;
+       }
+
        $chars2[0] = [qw( # ^ _ ` ~ )];
        @chars = @chars2;
        $di = $xorg;