3 my $mode = exists $get{compare};
4 my @tablist = split m{/+}, $Request || 'default';
7 title => 'charset cheat sheet',
10 "Reference sheet with all glyphs in common character encoding tables,",
11 "and an overview of Unicode ranges and UTF-8 bytes.",
14 charset codepage unicode ascii utf8 latin glyph character encoding
15 reference common overview table
17 stylesheet => [qw'light'],
19 charset-encoding.inc.pl
20 charset-unicode.inc.pl charset-ucplanes.inc.pl charset-utf8.inc.pl
24 use List::Util qw( first pairmap pairfirst pairs );
27 <h1>Character encodings</h1>
31 if ($tablist[0] eq 'default') {
32 say "Overview of Unicode allocation and common latin code pages.";
33 say "Compare alternate charsets:";
36 say "Charset comparison:";
40 my ($title, $href, $selected) = @_;
42 $selected ? '<strong>%s</strong>' : '<a href="%2$s">%s</a>',
43 EscapeHTML($title), $href
49 join " ·\n", pairmap {
50 optionlink($b || ucfirst $a, '/charset'.($a && "/$a?compare"), $a eq $Request);
59 $tablist[0] eq 'default' ? () : ('' => 'common'),
64 norteur => 'North European',
76 use Shiar_Sheet::FormatChar;
77 my $glyphs = Shiar_Sheet::FormatChar->new;
80 my $charsets = do 'charset-encoding.inc.pl'
81 or Alert('Encoding metadata could not be read', $@ || $!);
84 # generate character table(s)
85 my $input = shift or return;
86 my $params = $input =~ s/[+](.*)\z// ? $1 : undef;
87 my $charset = $charsets->{lc $input} || {};
89 if (ref $charset ne 'HASH') {
90 $params and Alert("Parameters ignored for $input",
91 "Cannot apply <q>$params</q> to multiple charsets.",
93 tabinput($_) for ref $charset ? @{$charset} : $charset;
97 state $visible = {'' => 1}; # all present tables
98 my %row = (offset => 0, cols => 16);
100 if (not defined $params) {
101 my @parents = @{ $charset->{inherit} || [] };
103 if (my ($parent, $part) = pairfirst { defined $visible->{$a} } @parents) {
104 $row{parent} = $parent;
106 $params = 80 unless $visible->{$parent}
107 or ($input eq 'MacCroatian' and defined $visible->{MacRomanian});
109 elsif (defined $visible->{ascii}) {
110 $row{parent} = $parents[0];
111 $params = $parents[1] // 80;
112 $params = 80 if hex $params >= 0x80; # ascii offset at most
115 $row{parent} = $parents[0];
116 $params = $parents[1] if hex $parents[1] == 0; # apply ascii end
118 $visible->{$_} //= 0 for $row{parent} || ();
121 for my $param (split /[+]+/, $params // '') {
122 if ($param eq 'realsize') {
125 elsif ($param =~ m{ \A cols = (\d+) \z }x) {
128 elsif ($param =~ m{ \A (?<start> \p{AHex}+) (?: [-] (?<end> \p{AHex}+) )? \z }x) {
129 if (defined $row{endpoint}) {
130 # extend earlier range
131 my $skip = int(($row{endpoint} || $row{startpoint}) / $row{cols});
132 for ($skip + 1 .. (hex($+{start}) / $row{cols}) - 1) {
133 $row{skip}->{ $_ * $row{cols} - $row{startpoint} }++;
137 $row{startpoint} = hex $+{start};
139 $row{endpoint} = hex($+{end} || 0);
142 Alert("Unknown option <q>$param</q> for charset $input");
146 if ($charset->{setup}) {
147 eval { $charset->{setup}->(\%row) }
148 or Alert("Incomplete setup of $input", $@);
152 elsif ($row{set} = Encode::resolve_alias($input)) {
153 $row{offset} = delete $row{startpoint};
154 $row{endpoint} ||= 0xFF;
155 if ($row{set} eq 'MacHebrew' or $row{set} eq 'MacThai') {
156 # array of possibly multiple characters per code point
158 map { Encode::decode($row{set}, pack 'C*', $_) } $row{offset} .. $row{endpoint}
162 # ~16x faster than decoding in loop;
163 # substr strings is twice as fast as splitting to an array
164 $row{table} = Encode::decode($row{set}, pack 'C*', $row{offset} .. $row{endpoint});
167 $row{endpoint} -= $row{offset};
169 $visible->{ascii} = # assume common base
170 $visible->{ $row{set} } = 1;
173 Alert("Encoding <q>$input</q> unknown");
177 if (my $replace = $charset->{replace}) {
178 while (my ($offset, $sub) = each %{$replace}) {
179 $offset -= $row{offset};
181 my $length = length $sub;
184 $offset > -$length or next; # at least one character after start
185 # trim leftmost part to start at offset
186 substr($sub, 0, -$offset) = '';
191 if ((my $excess = $row{endpoint} - $offset - $length + 1) < 0) {
192 $excess > -$length or next;
193 # trim rightmost part to prevent overflow
194 substr($sub, $excess) = '';
198 substr($row{table}, $offset, $length) = $sub;
202 push @request, \%row;
204 tabinput($_) for @tablist;
206 my $NOCHAR = chr 0xFFFD;
209 my ($info, $offset) = @_;
210 my $table = $info->{cell} or return;
211 my $def = $table->{$offset} or return;
212 my ($len, $class, $name, $title) = @{$def};
214 my $cols = $info->{cols};
215 my $colsize = $table->{colsize} || 1;
218 $name //= $len <= 2 ? 'res' : 'reserved';
220 if (my $part = ($offset/$colsize - $info->{startpoint}) % $cols) {
222 my $rest = $cols - $part; # remaining
223 $rest = $len if $len < $rest; #TODO: optimise
225 # continued on new row
226 my @next = ($len * $colsize, "$class joinu");
227 my $separate = $cols - $len > $rest; # columns not on next row
230 push @next, $name, $title;
232 $name = $separate && '…';
235 # minority on next row
236 push @next, $separate && '"', $title || $name;
238 $table->{$offset + $colsize*$rest} //= \@next;
243 elsif (my $rows = int($len / $cols)) {
245 my $rowsize = $colsize * $cols;
246 if ($len -= $rows * $cols) {
247 # partial row remains
248 $table->{$offset + $rowsize * $rows} //= [$len*$colsize, "$class joinu", '', $title];
252 unless ($info->{realsize}) {
253 # coalesce multiple rows
255 $info->{skip}->{$offset += $rowsize}++;
259 $info->{skip}->{$offset += $rowsize} = 0;
263 $attr .= sprintf ' rowspan=%d', $rows;
267 $attr .= sprintf ' colspan=%d', $len unless $len == 1;
268 $attr .= $1 if $class and $class =~ s/( \w+="[^"]*")//;
269 $attr .= sprintf ' class="%s"', $class if $class;
270 $attr .= sprintf ' title="%s"', EscapeHTML($title) if $title;
271 return "<td$attr>$name\n";
274 for my $row (@request) {
275 my $cols = $row->{cols};
276 my $colsize = $row->{cell} && $row->{cell}->{colsize} || 1;
277 my $coldigits = ceil(log($colsize * $cols) / log(16)); # uniform length of hexadecimal header
278 my $rowdiv = 16 ** $coldigits; # row divide for column digits
279 $rowdiv = 1 if $rowdiv != $cols * $colsize; # divide only if all columns are matched
280 my $offset = $row->{startpoint} * $colsize || 0;
282 printf '<div class="section"><table class="glyphs%s">', !$row->{cell} && ' charmap';
283 my $title = $row->{set};
284 $title .= " <aside>(over $_)</aside>"
285 for $row->{parent} || ();
286 printf '<caption>%s</caption>', $title;
287 print '<col>' x ($cols + 1);
288 for my $section (qw{thead}) {
289 print "<$section><tr><th>", $rowdiv == 1 ? '+' : '↱';
290 printf '<th>%0*X', $coldigits, $_ * $colsize for 0 .. $cols - 1;
295 while ($offset <= $row->{endpoint} * $colsize) {
296 if ($row->{skip}->{$offset}) {
297 $offset += $cols * $colsize;
302 if (defined $row->{skip}->{$offset}) {
306 if (my $rowmod = $offset % $rowdiv) {
307 # offset in column units
308 printf '<small>+%X</small>', $rowmod;
312 printf '%X', ($offset + $row->{offset}) / $rowdiv;
319 print range_cell($row, $offset);
323 my $cp = $offset + $row->{offset};
324 my $glyph = ref $row->{table} eq 'ARRAY' ? $row->{table}->[$offset] :
325 substr $row->{table}, $offset, 1;
326 my ($cell, $name, $class) = $glyph eq $NOCHAR ? () :
327 $glyphs->glyph_html($glyph);
332 $cp == ord $glyph ? 'l4' :
333 $row->{parent} && $glyph eq
334 Encode::decode($row->{parent}, pack 'C', $cp) ? 'l3' :
336 $visible->{$glyph} ? 'l2' :
339 $visible->{$glyph}++;
342 say sprintf $class ? '<td title="%s" class="X %s">%s' : '<td title="%s">',
343 $name, $class, $cell;
349 say '</table></div>';
356 <table class="glyphs"><tr><: if ($mode) { :>
357 <td class="X l4">unicode
358 <td class="X l3">inherited
359 <td class="X l2">existing
360 <td class="X l1">original
361 <td class="">unassigned
363 <td class="X Cc">control
364 <td class="X Zs"><span>whitespace</span>
365 <td class="X Mn">diacritic<table class="glyphs"><tr>
366 <td class="X Sk">letter
368 <td class="X Po">punctuation<table class="glyphs"><tr>
369 <td class="X Pf">quote
371 <td class="X So">symbol<table class="glyphs"><tr>
372 <td class="X Sm">math
373 <td class="X Sc">currency
375 <td class="X No">numeric
376 <td class="X Greek">greek<table class="glyphs"><tr>
377 <td class="X Latin">latin
378 <td class="X Cyrillic">cyrillic
380 <td class="X Aramaic">aramaic<table class="glyphs"><tr>
381 <td class="X Brahmic">brahmic
382 <td class="X Arabic">arabic
384 <td class="X Syllabic">syllabic<table class="glyphs"><tr>
385 <td class="X African">african
386 <td class="X Hiragana">japanese
387 <td class="X Han">cjk
388 <td class="X Bopomofo">chinese
390 <td class="X Alpha">alphabetic
393 <table class="glyphs"><tr>
394 <td class="X">unicode 7.0
395 <td class="X Xr">proposed
396 <td class="X Xd">deprecated
397 <td class="">unassigned
398 <td class="X Xi">invalid