Character encodings

<: if ($tablist[0] eq 'default') { say "Overview of Unicode allocation and common latin code pages."; say "Compare alternate charsets:"; } else { say "Charset comparison:"; } sub optionlink { my ($title, $href, $selected) = @_; return sprintf( $selected ? '%s' : '%s', EscapeHTML($title), $href ); } print join " •\n", ( map { join " ·\n", pairmap { optionlink($b || ucfirst $a, '/charset'.($a && "/$a?compare"), $a eq $Request); } @{$_} } [ iso => 'ISO', dos => 'DOS', mac => 'Apple', ebcdic => 'EBCDIC', $tablist[0] eq 'default' ? () : ('' => 'common'), ], [ westeur => 'West', centeur => 'Central', norteur => 'North European', turkish => 0, greek => 0, cyrillic => 0, hebrew => 0, ], ); :>.

\d+) (?: [-] (? \d+) )? \z }x) { if (defined $row{endpoint}) { # extend earlier range my $skip = int(($row{endpoint} || $row{offset}) / $row{cols}); for ($skip + 1 .. ($+{offset} / $row{cols}) - 1) { $row{skip}->{ $_ * $row{cols} - $row{offset} }++; } } else { $row{offset} = $+{offset}; } $row{endpoint} = $+{endpoint} || 0; } else { Alert("Unknown option $param for charset $input"); } } if ($input =~ m{ \A u ([0-9a-f]+) (?:-([0-9a-f]+))? \z }ix) { my $start = hex($1) << ($2 ? 4 : 8); my $end = $2 ? (hex($2) << 4) + $row{cols} - 1 : $start + 255; $row{table} = join '', map { chr } $start .. $end; utf8::upgrade($row{table}); # prevent latin1 output $row{endpoint} = $end - $start; $row{set} = sprintf 'Unicode block U+%02Xxx', $start >> 8; $row{offset} = $start % 256; } elsif (lc $input eq 'uu') { $row{set} = 'Unicode planes'; $row{cell} = do 'charset-ucplanes.inc.pl' or Alert('Table data could not be read', $@ || $!); $row{endpoint} = 1023 * $row{cell}->{colsize}; } elsif (lc $input eq 'u') { $row{cell} = do 'charset-unicode.inc.pl' or Alert('Table data could not be read', $@ || $!); $row{endpoint} ||= 8191; $row{endpoint} *= $row{cell}->{colsize}; $row{startpoint} = $row{cell}->{colsize} * $row{offset}; $row{offset} = 0; $row{set} = 'Unicode ' . ( $row{startpoint} < 0x10000 && $row{endpoint} < 0x10000 ? 'BMP' : $row{startpoint} >= 0x10000 && $row{endpoint} < 0x20000 ? 'SMP' : 'allocations' ); } elsif ($input =~ m/^utf-*8$/i) { $row{set} = 'UTF-8'; $row{cell} = do 'charset-utf8.inc.pl' or Alert('Table data could not be read', $@ || $!); $row{endpoint} = 255; } elsif ($row{set} = Encode::resolve_alias($input)) { $row{endpoint} ||= 255; if ($row{set} eq 'MacHebrew' or $row{set} eq 'MacThai') { # array of possibly multiple characters per code point $row{table} = [ map { Encode::decode($row{set}, pack 'C*', $_) } $row{offset} .. $row{endpoint} ]; } else { # ~16x faster than decoding in loop; # substr strings is twice as fast as splitting to an array $row{table} = Encode::decode($row{set}, pack 'C*', $row{offset} .. $row{endpoint}); } $row{endpoint} -= $row{offset}; if ($row{set} eq 'cp437') { for my $phipos (237 - $row{offset}) { next if $phipos < 0 or $phipos > $row{endpoint}; # replace phi glyph substr($row{table}, $phipos, 1) = pack 'U*', 0x3D5; } if ($row{offset} == 0) { # replace control characters by visible variants substr($row{table}, 0, 32) = pack 'U*', map {hex} qw( 2007 263A 263B 2665 2666 2663 2660 2022 25D8 25CB 25D9 2642 2640 266A 266B 263C 25BA 25C4 2195 203C 00B6 00A7 25AC 21A8 2191 2193 2192 2190 221F 2194 25B2 25BC ); } } $visible->{ascii} = # assume common base $visible->{ $row{set} } = 1; } else { Alert("Encoding $input unknown"); return; } push @request, \%row; } tabinput($_) for @tablist; my $NOCHAR = chr 0xFFFD; sub range_cell { my ($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'; if (my $part = $offset/$colsize % $cols) { # continued row my $rest = $cols - $part; # remaining $rest = $len if $len < $rest; #TODO: optimise if ($len -= $rest) { # continued on new row my @next = ($len * $colsize, "$class joinu"); if ($len > $rest) { # minority remains push @next, $name, $title; $title ||= $name; $name = ''; } else { # minority on next row push @next, '"', $title || $name; } $table->{$offset + $colsize*$rest} //= \@next; $class .= ' joind'; } $len = $rest; } elsif (my $rows = int($len / $cols)) { # multiple full rows my $rowsize = $colsize * $cols; if ($len -= $rows * $cols) { # partial row remains $table->{$offset + $rowsize * $rows} //= [$len*$colsize, "$class joinu", '', $title]; $class .= ' joind'; } unless ($info->{realsize}) { # coalesce multiple rows while ($rows > 3) { $info->{skip}->{$offset += $rowsize}++; $rows--; } if ($rows > 2) { $info->{skip}->{$offset += $rowsize} = 0; } } $attr .= sprintf ' rowspan=%d', $rows; $len = $cols; } $attr .= sprintf ' colspan=%d', $len unless $len == 1; $attr .= $1 if $class and $class =~ s/( \w+="[^"]*")//; $attr .= sprintf ' class="%s"', $class if $class; $attr .= sprintf ' title="%s"', EscapeHTML($title) if $title; return "$name\n"; } 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 = $row->{startpoint} || 0; printf '

', !$row->{cell} && ' charmap'; my $title = $row->{set}; $title .= " " for grep { $_ ne 'iso-8859-1' } $row->{parent} // (); printf '', $title; print '' x ($cols + 1); for my $section (qw{thead}) { print "<$section>'; while ($offset < $row->{endpoint}) { if ($row->{skip}->{$offset}) { $offset += $cols * $colsize; next; } print '

%s
", $rowdiv == 1 ? '+' : '↱'; printf '	%0X', $coldigits, $_ $colsize for 0 .. $cols - 1; print "\n"; } print '
'; if (defined $row->{skip}->{$offset}) { print '⋮'; } else { if (my $rowmod = $offset % $rowdiv) { # offset in column units printf '+%X', $rowmod; } else { # divided row offset printf '%X', ($offset + $row->{offset}) / $rowdiv; } } say ''; for (1 .. $cols) { if ($row->{cell}) { print range_cell($row, $offset); next; } my $cp = $offset + $row->{offset}; my $glyph = ref $row->{table} eq 'ARRAY' ? $row->{table}->[$offset] : substr $row->{table}, $offset, 1; my ($cell, $name, $class) = $glyph eq $NOCHAR ? () : $glyphs->glyph_html($glyph); if (exists $get{compare}) { state $visible = {}; $class = ( $cp == ord $glyph ? 'l4' : $row->{parent} && $glyph eq Encode::decode($row->{parent}, pack 'C', $cp) ? 'l3' : !$class ? undef : $visible->{$glyph} ? 'l2' : 'l1' ); $visible->{$glyph}++; } say sprintf $class ? '	%s' : '	', $name, $class, $cell; } continue { $offset += $colsize; } } say '

'; } :>

<: if (exists $get{compare}) { :>

unicode

inherited

existing

original

unassigned <: } else { :>

control

whitespace

diacritic

letter

punctuation

quote

symbol

math

currency

numeric

greek

latin

cyrillic

aramaic

brahmic

arabic

syllabic

african

japanese

cjk

chinese

alphabetic

unicode 7.0

proposed

deprecated

unassigned

invalid <: } :>