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uni/class.t: Add test
[perl5.git] / lib / utf8_heavy.pl
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a0ed51b3 1package utf8;
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2use strict;
3use warnings;
a0ed51b3 4
15732964 5sub DEBUG () { 0 }
4b17cb47 6$|=1 if DEBUG;
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7
8sub DESTROY {}
9
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10my %Cache;
11
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12sub croak { require Carp; Carp::croak(@_) }
13
c4ab2516 14sub _loose_name ($) {
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15 # Given a lowercase property or property-value name, return its
16 # standardized version that is expected for look-up in the 'loose' hashes
17 # in Heavy.pl (hence, this depends on what mktables does). This squeezes
18 # out blanks, underscores and dashes. The complication stems from the
19 # grandfathered-in 'L_', which retains a single trailing underscore.
20
21 my $loose = $_[0] =~ s/[-\s_]//rg;
22
cf2cd801 23 return $loose if $loose !~ / ^ (?: is | to )? l $/x;
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24 return 'l_' if $_[0] =~ / l .* _ /x; # If original had a trailing '_'
25 return $loose;
26}
27
5beb625e 28##
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29## "SWASH" == "SWATCH HASH". A "swatch" is a swatch of the Unicode landscape.
30## It's a data structure that encodes a set of Unicode characters.
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31##
32
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33{
34 # If a floating point number is within this distance from the value of a
35 # fraction, it is considered to be that fraction, even if many more digits
36 # are specified that don't exactly match.
37 my $min_floating_slop;
38
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39 # To guard against this program calling something that in turn ends up
40 # calling this program with the same inputs, and hence infinitely
41 # recursing, we keep a stack of the properties that are currently in
42 # progress, pushed upon entry, popped upon return.
43 my @recursed;
44
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45 sub SWASHNEW {
46 my ($class, $type, $list, $minbits, $none) = @_;
0fada5e1 47 my $user_defined = 0;
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48 local $^D = 0 if $^D;
49
3dd10fe8 50 $class = "" unless defined $class;
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51 print STDERR __LINE__, ": class=$class, type=$type, list=",
52 (defined $list) ? $list : ':undef:',
53 ", minbits=$minbits, none=$none\n" if DEBUG;
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54
55 ##
56 ## Get the list of codepoints for the type.
57 ## Called from swash_init (see utf8.c) or SWASHNEW itself.
58 ##
59 ## Callers of swash_init:
60 ## op.c:pmtrans -- for tr/// and y///
61 ## regexec.c:regclass_swash -- for /[]/, \p, and \P
62 ## utf8.c:is_utf8_common -- for common Unicode properties
63 ## utf8.c:to_utf8_case -- for lc, uc, ucfirst, etc. and //i
681d705c 64 ## Unicode::UCD::prop_invlist
62b3b855 65 ## Unicode::UCD::prop_invmap
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66 ##
67 ## Given a $type, our goal is to fill $list with the set of codepoint
68 ## ranges. If $type is false, $list passed is used.
69 ##
70 ## $minbits:
71 ## For binary properties, $minbits must be 1.
72 ## For character mappings (case and transliteration), $minbits must
73 ## be a number except 1.
74 ##
75 ## $list (or that filled according to $type):
76 ## Refer to perlunicode.pod, "User-Defined Character Properties."
77 ##
78 ## For binary properties, only characters with the property value
79 ## of True should be listed. The 3rd column, if any, will be ignored
80 ##
81 ## $none is undocumented, so I'm (khw) trying to do some documentation
82 ## of it now. It appears to be if there is a mapping in an input file
83 ## that maps to 'XXXX', then that is replaced by $none+1, expressed in
83fe8199 84 ## hexadecimal. It is used somehow in tr///.
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85 ##
86 ## To make the parsing of $type clear, this code takes the a rather
87 ## unorthodox approach of last'ing out of the block once we have the
88 ## info we need. Were this to be a subroutine, the 'last' would just
89 ## be a 'return'.
90 ##
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91 # If a problem is found $type is returned;
92 # Upon success, a new (or cached) blessed object is returned with
93 # keys TYPE, BITS, EXTRAS, LIST, and NONE with values having the
94 # same meanings as the input parameters.
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95 # SPECIALS contains a reference to any special-treatment hash in the
96 # INVERT_IT is non-zero if the result should be inverted before use
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97 # USER_DEFINED is non-zero if the result came from a user-defined
98 # property.
99870f4d 99 my $file; ## file to load data from, and also part of the %Cache key.
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100
101 # Change this to get a different set of Unicode tables
102 my $unicore_dir = 'unicore';
a6517ebf 103 my $invert_it = 0;
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104
105 if ($type)
cf25bb62 106 {
3dd10fe8 107 # Verify that this isn't a recursive call for this property.
dbe7a391 108 # Can't use croak, as it may try to recurse to here itself.
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109 my $class_type = $class . "::$type";
110 if (grep { $_ eq $class_type } @recursed) {
111 CORE::die "panic: Infinite recursion in SWASHNEW for '$type'\n";
112 }
113 push @recursed, $class_type;
114
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115 $type =~ s/^\s+//;
116 $type =~ s/\s+$//;
117
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118 # regcomp.c surrounds the property name with '__" and '_i' if this
119 # is to be caseless matching.
120 my $caseless = $type =~ s/^__(.*)_i$/$1/;
121
122 print STDERR __LINE__, ": type=$type, caseless=$caseless\n" if DEBUG;
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123
124 GETFILE:
125 {
126 ##
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127 ## It could be a user-defined property. Look in current
128 ## package if no package given
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129 ##
130
131 my $caller1 = $type =~ s/(.+)::// ? $1 : caller(1);
132
d658a8a8 133 if (defined $caller1 && $type =~ /^I[ns]\w+$/) {
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134 my $prop = "${caller1}::$type";
135 if (exists &{$prop}) {
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136 # stolen from Scalar::Util::PP::tainted()
137 my $tainted;
138 {
139 local($@, $SIG{__DIE__}, $SIG{__WARN__});
140 local $^W = 0;
141 no warnings;
142 eval { kill 0 * $prop };
143 $tainted = 1 if $@ =~ /^Insecure/;
144 }
145 die "Insecure user-defined property \\p{$prop}\n"
146 if $tainted;
99870f4d 147 no strict 'refs';
4ff124d1 148 $list = &{$prop}($caseless);
0fada5e1 149 $user_defined = 1;
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150 last GETFILE;
151 }
152 }
153
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154 # During Perl's compilation, this routine may be called before
155 # the tables are constructed. If so, we have a chicken/egg
156 # problem. If we die, the tables never get constructed, so
157 # keep going, but return an empty table so only what the code
158 # has compiled in internally (currently ASCII/Latin1 range
159 # matching) will work.
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160 BEGIN {
161 # Poor man's constant, to avoid a run-time check.
162 $utf8::{miniperl}
163 = \! defined &DynaLoader::boot_DynaLoader;
164 }
165 if (miniperl) {
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166 eval "require '$unicore_dir/Heavy.pl'";
167 last GETFILE if $@;
168 }
169 else {
170 require "$unicore_dir/Heavy.pl";
171 }
1363cbd0 172 BEGIN { delete $utf8::{miniperl} }
99870f4d 173
4ff124d1 174 # All property names are matched caselessly
49801ec2 175 my $property_and_table = CORE::lc $type;
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176 print STDERR __LINE__, ": $property_and_table\n" if DEBUG;
177
178 # See if is of the compound form 'property=value', where the
179 # value indicates the table we should use.
180 my ($property, $table, @remainder) =
181 split /\s*[:=]\s*/, $property_and_table, -1;
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182 if (@remainder) {
183 pop @recursed if @recursed;
184 return $type;
185 }
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186
187 my $prefix;
188 if (! defined $table) {
189
190 # Here, is the single form. The property becomes empty, and
191 # the whole value is the table.
192 $table = $property;
193 $prefix = $property = "";
194 } else {
195 print STDERR __LINE__, ": $property\n" if DEBUG;
196
197 # Here it is the compound property=table form. The property
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198 # name is always loosely matched, and always can have an
199 # optional 'is' prefix (which isn't true in the single
200 # form).
c4ab2516 201 $property = _loose_name($property) =~ s/^is//r;
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202
203 # And convert to canonical form. Quit if not valid.
204 $property = $utf8::loose_property_name_of{$property};
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205 if (! defined $property) {
206 pop @recursed if @recursed;
207 return $type;
208 }
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209
210 $prefix = "$property=";
211
212 # If the rhs looks like it is a number...
213 print STDERR __LINE__, ": table=$table\n" if DEBUG;
214 if ($table =~ qr{ ^ [ \s 0-9 _ + / . -]+ $ }x) {
215 print STDERR __LINE__, ": table=$table\n" if DEBUG;
216
217 # Don't allow leading nor trailing slashes
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218 if ($table =~ / ^ \/ | \/ $ /x) {
219 pop @recursed if @recursed;
220 return $type;
221 }
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222
223 # Split on slash, in case it is a rational, like \p{1/5}
224 my @parts = split qr{ \s* / \s* }x, $table, -1;
225 print __LINE__, ": $type\n" if @parts > 2 && DEBUG;
226
227 # Can have maximum of one slash
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228 if (@parts > 2) {
229 pop @recursed if @recursed;
230 return $type;
231 }
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232
233 foreach my $part (@parts) {
234 print __LINE__, ": part=$part\n" if DEBUG;
235
236 $part =~ s/^\+\s*//; # Remove leading plus
237 $part =~ s/^-\s*/-/; # Remove blanks after unary
238 # minus
239
240 # Remove underscores between digits.
241 $part =~ s/( ?<= [0-9] ) _ (?= [0-9] ) //xg;
242
243 # No leading zeros (but don't make a single '0'
244 # into a null string)
245 $part =~ s/ ^ ( -? ) 0+ /$1/x;
246 $part .= '0' if $part eq '-' || $part eq "";
247
248 # No trailing zeros after a decimal point
249 $part =~ s/ ( \. .*? ) 0+ $ /$1/x;
250
251 # Begin with a 0 if a leading decimal point
252 $part =~ s/ ^ ( -? ) \. /${1}0./x;
253
254 # Ensure not a trailing decimal point: turn into an
255 # integer
256 $part =~ s/ \. $ //x;
257
258 print STDERR __LINE__, ": part=$part\n" if DEBUG;
259 #return $type if $part eq "";
260
261 # Result better look like a number. (This test is
262 # needed because, for example could have a plus in
263 # the middle.)
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264 if ($part !~ / ^ -? [0-9]+ ( \. [0-9]+)? $ /x) {
265 pop @recursed if @recursed;
266 return $type;
267 }
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268 }
269
270 # If a rational...
271 if (@parts == 2) {
272
273 # If denominator is negative, get rid of it, and ...
274 if ($parts[1] =~ s/^-//) {
275
276 # If numerator is also negative, convert the
277 # whole thing to positive, or move the minus to
278 # the numerator
279 if ($parts[0] !~ s/^-//) {
280 $parts[0] = '-' . $parts[0];
281 }
282 }
283 $table = join '/', @parts;
284 }
285 elsif ($property ne 'nv' || $parts[0] !~ /\./) {
286
287 # Here is not numeric value, or doesn't have a
288 # decimal point. No further manipulation is
289 # necessary. (Note the hard-coded property name.
290 # This could fail if other properties eventually
291 # had fractions as well; perhaps the cjk ones
292 # could evolve to do that. This hard-coding could
293 # be fixed by mktables generating a list of
294 # properties that could have fractions.)
295 $table = $parts[0];
296 } else {
297
298 # Here is a floating point numeric_value. Try to
299 # convert to rational. First see if is in the list
300 # of known ones.
301 if (exists $utf8::nv_floating_to_rational{$parts[0]}) {
302 $table = $utf8::nv_floating_to_rational{$parts[0]};
303 } else {
304
305 # Here not in the list. See if is close
306 # enough to something in the list. First
307 # determine what 'close enough' means. It has
308 # to be as tight as what mktables says is the
309 # maximum slop, and as tight as how many
310 # digits we were passed. That is, if the user
311 # said .667, .6667, .66667, etc. we match as
312 # many digits as they passed until get to
313 # where it doesn't matter any more due to the
314 # machine's precision. If they said .6666668,
315 # we fail.
316 (my $fraction = $parts[0]) =~ s/^.*\.//;
317 my $epsilon = 10 ** - (length($fraction));
318 if ($epsilon > $utf8::max_floating_slop) {
319 $epsilon = $utf8::max_floating_slop;
320 }
321
322 # But it can't be tighter than the minimum
323 # precision for this machine. If haven't
324 # already calculated that minimum, do so now.
325 if (! defined $min_floating_slop) {
326
327 # Keep going down an order of magnitude
328 # until find that adding this quantity to
329 # 1 remains 1; but put an upper limit on
330 # this so in case this algorithm doesn't
331 # work properly on some platform, that we
332 # won't loop forever.
333 my $count = 0;
334 $min_floating_slop = 1;
335 while (1+ $min_floating_slop != 1
336 && $count++ < 50)
337 {
338 my $next = $min_floating_slop / 10;
339 last if $next == 0; # If underflows,
340 # use previous one
341 $min_floating_slop = $next;
342 print STDERR __LINE__, ": min_float_slop=$min_floating_slop\n" if DEBUG;
343 }
344
345 # Back off a couple orders of magnitude,
346 # just to be safe.
347 $min_floating_slop *= 100;
348 }
349
350 if ($epsilon < $min_floating_slop) {
351 $epsilon = $min_floating_slop;
352 }
353 print STDERR __LINE__, ": fraction=.$fraction; epsilon=$epsilon\n" if DEBUG;
354
355 undef $table;
356
357 # And for each possible rational in the table,
358 # see if it is within epsilon of the input.
359 foreach my $official
360 (keys %utf8::nv_floating_to_rational)
361 {
362 print STDERR __LINE__, ": epsilon=$epsilon, official=$official, diff=", abs($parts[0] - $official), "\n" if DEBUG;
363 if (abs($parts[0] - $official) < $epsilon) {
364 $table =
365 $utf8::nv_floating_to_rational{$official};
366 last;
367 }
368 }
369
370 # Quit if didn't find one.
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371 if (! defined $table) {
372 pop @recursed if @recursed;
373 return $type;
374 }
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375 }
376 }
377 print STDERR __LINE__, ": $property=$table\n" if DEBUG;
378 }
379 }
380
381 # Combine lhs (if any) and rhs to get something that matches
382 # the syntax of the lookups.
383 $property_and_table = "$prefix$table";
384 print STDERR __LINE__, ": $property_and_table\n" if DEBUG;
385
386 # First try stricter matching.
387 $file = $utf8::stricter_to_file_of{$property_and_table};
388
389 # If didn't find it, try again with looser matching by editing
390 # out the applicable characters on the rhs and looking up
391 # again.
392 if (! defined $file) {
c4ab2516 393 $table = _loose_name($table);
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394 $property_and_table = "$prefix$table";
395 print STDERR __LINE__, ": $property_and_table\n" if DEBUG;
396 $file = $utf8::loose_to_file_of{$property_and_table};
397 }
398
399 # Add the constant and go fetch it in.
400 if (defined $file) {
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401
402 # A beginning ! means to invert
403 $invert_it = $file =~ s/^!//;
404
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405 if ($utf8::why_deprecated{$file}) {
406 warnings::warnif('deprecated', "Use of '$type' in \\p{} or \\P{} is deprecated because: $utf8::why_deprecated{$file};");
407 }
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408
409 if ($caseless
410 && exists $utf8::caseless_equivalent{$property_and_table})
411 {
412 $file = $utf8::caseless_equivalent{$property_and_table};
413 }
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414 $file= "$unicore_dir/lib/$file.pl";
415 last GETFILE;
416 }
417 print STDERR __LINE__, ": didn't find $property_and_table\n" if DEBUG;
418
419 ##
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420 ## Last attempt -- see if it's a standard "To" name
421 ## (e.g. "ToLower") ToTitle is used by ucfirst().
422 ## The user-level way to access ToDigit() and ToFold()
423 ## is to use Unicode::UCD.
424 ##
cf2cd801 425 # Only check if caller wants non-binary
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426 my $retried = 0;
427 if ($minbits != 1 && $property_and_table =~ s/^to//) {{
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428 # Look input up in list of properties for which we have
429 # mapping files.
430 if (defined ($file =
431 $utf8::loose_property_to_file_of{$property_and_table}))
432 {
433 $type = $utf8::file_to_swash_name{$file};
434 print STDERR __LINE__, ": type set to $type\n" if DEBUG;
435 $file = "$unicore_dir/$file.pl";
436 last GETFILE;
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437 } # If that fails see if there is a corresponding binary
438 # property file
439 elsif (defined ($file =
440 $utf8::loose_to_file_of{$property_and_table}))
441 {
442
443 # Here, there is no map file for the property we are
444 # trying to get the map of, but this is a binary
445 # property, and there is a file for it that can easily
446 # be translated to a mapping.
447
448 # In the case of properties that are forced to binary,
449 # they are a combination. We return the actual
450 # mapping instead of the binary. If the input is
451 # something like 'Tocjkkiicore', it will be found in
452 # %loose_property_to_file_of above as => 'To/kIICore'.
453 # But the form like ToIskiicore won't be. To fix
454 # this, it was easiest to do it here. These
455 # properties are the complements of the default
456 # property, so there is an entry in %loose_to_file_of
457 # that is 'iskiicore' => '!kIICore/N', If we find such
458 # an entry, strip off things and try again, which
459 # should find the entry in %loose_property_to_file_of.
460 # Actual binary properties that are of this form, such
461 # as this entry: 'ishrkt' => '!Perl/Any' will also be
462 # retried, but won't be in %loose_property_to_file_of,
463 # and instead the next time through, it will find
464 # 'hrkt' => '!Perl/Any' and proceed.
465 redo if ! $retried
466 && $file =~ /^!/
467 && $property_and_table =~ s/^is//;
468
469 # This is a binary property. Setting this here causes
470 # it to be stored as such in the cache, so if someone
471 # comes along later looking for just a binary, they
472 # get it.
473 $minbits = 1;
474
475 $invert_it = $file =~ s/^!//;
476 $file = "$unicore_dir/lib/$file.pl";
477 last GETFILE;
cf2cd801 478 }
6aec79bd 479 } }
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480
481 ##
482 ## If we reach this line, it's because we couldn't figure
483 ## out what to do with $type. Ouch.
484 ##
485
3dd10fe8 486 pop @recursed if @recursed;
99870f4d 487 return $type;
c9db9632 488 } # end of GETFILE block
cf25bb62 489
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490 if (defined $file) {
491 print STDERR __LINE__, ": found it (file='$file')\n" if DEBUG;
492
493 ##
494 ## If we reach here, it was due to a 'last GETFILE' above
495 ## (exception: user-defined properties and mappings), so we
496 ## have a filename, so now we load it if we haven't already.
497 ## If we have, return the cached results. The cache key is the
498 ## class and file to load.
499 ##
500 my $found = $Cache{$class, $file};
501 if ($found and ref($found) eq $class) {
a6517ebf 502 print STDERR __LINE__, ": Returning cached '$file' for \\p{$type}; invert_it=$invert_it\n" if DEBUG;
3dd10fe8 503 pop @recursed if @recursed;
a6517ebf 504 $found->{'INVERT_IT'} = $invert_it;
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505 return $found;
506 }
507
508 local $@;
509 local $!;
510 $list = do $file; die $@ if $@;
0a0ffbce 511 }
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512 } # End of $type is non-null
513
514 # Here, either $type was null, or we found the requested property and
515 # read it into $list
cf25bb62 516
99870f4d 517 my $extras;
c9db9632 518
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519 my $bits = $minbits;
520
99870f4d 521 if ($list) {
0e9be77f 522 my $taint = substr($list,0,0); # maintain taint
9b225781 523
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524 # Separate the extras from the code point list, and for
525 # user-defined properties, make sure the latter are well-behaved
9b225781 526 # for downstream code.
4de6d205 527 if ($user_defined) {
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528 my @tmp = split(/^/m, $list);
529 my %seen;
530 no warnings;
531
532 # The extras are anything that doesn't begin with a hex digit.
533 $extras = join '', $taint, grep /^[^0-9a-fA-F]/, @tmp;
534
535 # Remove the extras, and sort the remaining entries by the
536 # numeric value of their beginning hex digits, removing any
537 # duplicates.
538 $list = join '', $taint,
539 map { $_->[1] }
540 sort { $a->[0] <=> $b->[0] }
541 map { /^([0-9a-fA-F]+)/; [ CORE::hex($1), $_ ] }
542 grep { /^([0-9a-fA-F]+)/ and not $seen{$1}++ } @tmp; # XXX doesn't do ranges right
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543 }
544 else {
545 # mktables has gone to some trouble to make non-user defined
546 # properties well-behaved, so we can skip the effort we do for
547 # user-defined ones. Any extras are at the very beginning of
548 # the string.
549
550 # This regex splits out the first lines of $list into $1 and
551 # strips them off from $list, until we get one that begins
552 # with a hex number, alone on the line, or followed by a tab.
553 # Either portion may be empty.
554 $list =~ s/ \A ( .*? )
555 (?: \z | (?= ^ [0-9a-fA-F]+ (?: \t | $) ) )
556 //msx;
557
558 $extras = "$taint$1";
559 }
99870f4d 560 }
a0ed51b3 561
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562 if ($none) {
563 my $hextra = sprintf "%04x", $none + 1;
564 $list =~ s/\tXXXX$/\t$hextra/mg;
565 }
a0ed51b3 566
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567 if ($minbits != 1 && $minbits < 32) { # not binary property
568 my $top = 0;
569 while ($list =~ /^([0-9a-fA-F]+)(?:[\t]([0-9a-fA-F]+)?)(?:[ \t]([0-9a-fA-F]+))?/mg) {
570 my $min = CORE::hex $1;
571 my $max = defined $2 ? CORE::hex $2 : $min;
572 my $val = defined $3 ? CORE::hex $3 : 0;
573 $val += $max - $min if defined $3;
574 $top = $val if $val > $top;
575 }
576 my $topbits =
577 $top > 0xffff ? 32 :
578 $top > 0xff ? 16 : 8;
579 $bits = $topbits if $bits < $topbits;
580 }
a0ed51b3 581
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582 my @extras;
583 if ($extras) {
584 for my $x ($extras) {
0e9be77f 585 my $taint = substr($x,0,0); # maintain taint
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586 pos $x = 0;
587 while ($x =~ /^([^0-9a-fA-F\n])(.*)/mg) {
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588 my $char = "$1$taint";
589 my $name = "$2$taint";
590 print STDERR __LINE__, ": char [$char] => name [$name]\n"
591 if DEBUG;
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592 if ($char =~ /[-+!&]/) {
593 my ($c,$t) = split(/::/, $name, 2); # bogus use of ::, really
594 my $subobj;
595 if ($c eq 'utf8') {
596 $subobj = utf8->SWASHNEW($t, "", $minbits, 0);
597 }
598 elsif (exists &$name) {
599 $subobj = utf8->SWASHNEW($name, "", $minbits, 0);
600 }
601 elsif ($c =~ /^([0-9a-fA-F]+)/) {
602 $subobj = utf8->SWASHNEW("", $c, $minbits, 0);
603 }
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604 if (! ref $subobj) {
605 pop @recursed if @recursed && $type;
606 return $subobj;
607 }
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608 push @extras, $name => $subobj;
609 $bits = $subobj->{BITS} if $bits < $subobj->{BITS};
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610 $user_defined = $subobj->{USER_DEFINED}
611 if $subobj->{USER_DEFINED};
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612 }
613 }
614 }
615 }
a0ed51b3 616
99870f4d 617 if (DEBUG) {
0fada5e1 618 print STDERR __LINE__, ": CLASS = $class, TYPE => $type, BITS => $bits, NONE => $none, INVERT_IT => $invert_it, USER_DEFINED => $user_defined";
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619 print STDERR "\nLIST =>\n$list" if defined $list;
620 print STDERR "\nEXTRAS =>\n$extras" if defined $extras;
621 print STDERR "\n";
622 }
a0ed51b3 623
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624 my $SWASH = bless {
625 TYPE => $type,
626 BITS => $bits,
627 EXTRAS => $extras,
628 LIST => $list,
629 NONE => $none,
0fada5e1 630 USER_DEFINED => $user_defined,
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631 @extras,
632 } => $class;
633
634 if ($file) {
635 $Cache{$class, $file} = $SWASH;
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636 if ($type
637 && exists $utf8::SwashInfo{$type}
638 && exists $utf8::SwashInfo{$type}{'specials_name'})
639 {
640 my $specials_name = $utf8::SwashInfo{$type}{'specials_name'};
641 no strict "refs";
69b36ee0 642 print STDERR "\nspecials_name => $specials_name\n" if DEBUG;
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643 $SWASH->{'SPECIALS'} = \%$specials_name;
644 }
a6517ebf 645 $SWASH->{'INVERT_IT'} = $invert_it;
99870f4d 646 }
5beb625e 647
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648 pop @recursed if @recursed && $type;
649
99870f4d 650 return $SWASH;
5beb625e 651 }
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652}
653
979f2922 654# Now SWASHGET is recasted into a C function S_swash_get (see utf8.c).
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655
6561;