X-Git-Url: http://git.shiar.nl/sheet.git/blobdiff_plain/780c810a9f1cb1461d8c28da4b7ebbb5a34af041..1b025f386b84705e81bd75c166bf0f08d5891608:/charset.plp

diff --git a/charset.plp b/charset.plp
index ff5419f..28c21c9 100644
--- a/charset.plp
+++ b/charset.plp
@@ -19,10 +19,9 @@ Html({
 <h1>Character encoding</h1>
 
 <:
+use POSIX qw( ceil );
 use Shiar_Sheet::FormatChar;
 my $glyphs = Shiar_Sheet::FormatChar->new;
-my $cols = 16;  # columns
-my $colsize = 1;  # increment per column
 
 # generate character table(s)
 # (~16x faster than decoding in loop;
@@ -39,7 +38,7 @@ my %ALIAS = (
 );
 my @request = map {
 	if (my $input = $_) {
-		my %row = (offset => 0);
+		my %row = (offset => 0, cols => 16);
 		my $endpoint = 255;
 		if ($input =~ s/^--//) {
 			$row{offset} = $endpoint > 160 ? 160 : 48;
@@ -67,7 +66,7 @@ my @request = map {
 			$row{set} = 'Unicode planes';
 			$row{cell} = do 'charset-ucplanes.inc.pl'
 				or Alert('Table data could not be read', $@ || $!);
-			$colsize = 8;
+			$row{cols} *= 2;
 		}
 		elsif ($row{set} = Encode::resolve_alias($input)) {
 			if ($row{set} eq 'Internal') {
@@ -107,10 +106,13 @@ for my $cp437 (grep {$request[$_]->{set} eq 'cp437'} 0 .. $#request) {
 }
 
 sub range_cell {
-	my ($table, $offset) = @_;
+	my ($info, $offset) = @_;
+	my $table = $info->{cell} or return;
 	my $def = $table->{$offset} or return;
 	my ($len, $class, $name, $title) = @{$def};
 
+	my $cols = $info->{cols};
+	my $colsize = $table->{colsize} || 1;
 	my $attr = '';
 	$len /= $colsize;
 	$name //= $len <= 2 ? 'res' : 'reserved';
@@ -156,28 +158,44 @@ sub range_cell {
 }
 
 for my $row (@request) {
+	my $cols = $row->{cols};
+	my $colsize = $row->{cell} && $row->{cell}->{colsize} || 1;
+	my $coldigits = ceil(log($colsize * $cols) / log(16));  # uniform length of hexadecimal header
+	my $rowdiv = 16 ** $coldigits;  # row divide for column digits
+	$rowdiv = 1 if $rowdiv != $cols * $colsize;  # divide only if all columns are matched
+	my $offset = 0;
+	my $endpoint = $offset + (length($row->{table}) || 256) * $colsize;
+
 	printf '<div class="section"><table class="glyphs%s">', !$row->{cell} && ' charmap';
 	my $title = $row->{set};
 	$title .= " <aside>($_)</aside>" for $row->{setnote} // ();
 	printf '<caption>%s</caption>', $title;
 	print '<col>' x ($cols + 1);
-	my $coldigits = $colsize * $cols <= 16 ? 1 : 2;  # uniform length of hexadecimal header
 	for my $section (qw{thead}) {
-		print "<$section><tr><th>↱";
+		print "<$section><tr><th>", $rowdiv == 1 ? '+' : '↱';
 		printf '<th>%0*X', $coldigits, $_ * $colsize for 0 .. $cols - 1;
 		print "\n";
 	}
 	print '<tbody>';
-	for my $msb (0 .. ((length($row->{table}) || 256) - 1) / $cols) {
-		printf '<tr><th>%X', ($msb + int($row->{offset} / $cols)) * $cols * $colsize;
-		for my $lsb (0 .. $cols - 1) {
-			my $val = ( ($msb * $cols) + $lsb ) * $colsize;
+	while ($offset < $endpoint - 1) {
+		print '<tr><th>';
+		{
+			if (my $rowmod = $offset % $rowdiv) {
+				# offset in column units
+				printf '<small>+%X</small>', $rowmod;
+			}
+			else {
+				# divided row offset
+				printf '%X', ($offset + $row->{offset}) / $rowdiv;
+			}
+		}
+		for (1 .. $cols) {
 			if ($row->{cell}) {
-				print range_cell($row->{cell}, $val);
+				print range_cell($row, $offset);
 				next;
 			}
 
-			my $glyph = substr $row->{table}, $val, 1;
+			my $glyph = substr $row->{table}, $offset, 1;
 			if ($glyph eq $NOCHAR) {
 				print '<td>';
 				next;
@@ -185,6 +203,9 @@ for my $row (@request) {
 
 			print "\n".$glyphs->glyph_cell($glyph);
 		}
+		continue {
+			$offset += $colsize;
+		}
 		print "\n";
 	}
 	say '</table></div>';