1package utf8;
2use strict;
3use warnings;
4
5sub DEBUG () { 0 }
6
7sub DESTROY {}
8
9my %Cache;
10
11our (%PropertyAlias, %PA_reverse, %PropValueAlias, %PVA_reverse, %PVA_abbr_map);
12
13sub croak { require Carp; Carp::croak(@_) }
14
15##
16## "SWASH" == "SWATCH HASH". A "swatch" is a swatch of the Unicode landscape.
17## It's a data structure that encodes a set of Unicode characters.
18##
19
20sub SWASHNEW {
21    my ($class, $type, $list, $minbits, $none) = @_;
22    local $^D = 0 if $^D;
23
24    print STDERR "SWASHNEW @_\n" if DEBUG;
25
26    ##
27    ## Get the list of codepoints for the type.
28    ## Called from utf8.c
29    ##
30    ## Given a $type, our goal is to fill $list with the set of codepoint
31    ## ranges.
32    ##
33    ## To make the parsing of $type clear, this code takes the a rather
34    ## unorthodox approach of last'ing out of the block once we have the
35    ## info we need. Were this to be a subroutine, the 'last' would just
36    ## be a 'return'.
37    ##
38    my $file; ## file to load data from, and also part of the %Cache key.
39    my $ListSorted = 0;
40
41    if ($type)
42    {
43        $type =~ s/^\s+//;
44        $type =~ s/\s+$//;
45
46        print "type = $type\n" if DEBUG;
47
48      GETFILE:
49        {
50	    ##
51	    ## It could be a user-defined property.
52	    ##
53
54	    my $caller1 = $type =~ s/(.+)::// ? $1 : caller(1);
55
56	    if (defined $caller1 && $type =~ /^(?:\w+)$/) {
57		my $prop = "${caller1}::$type";
58		if (exists &{$prop}) {
59		    no strict 'refs';
60
61		    $list = &{$prop};
62		    last GETFILE;
63		}
64	    }
65
66            my $wasIs;
67
68            ($wasIs = $type =~ s/^Is(?:\s+|[-_])?//i)
69              or
70            $type =~ s/^(?:(?:General(?:\s+|_)?)?Category|gc)\s*[:=]\s*//i
71              or
72            $type =~ s/^(?:Script|sc)\s*[:=]\s*//i
73              or
74            $type =~ s/^Block\s*[:=]\s*/In/i;
75
76
77	    ##
78	    ## See if it's in some enumeration.
79	    ##
80	    require "unicore/PVA.pl";
81	    if ($type =~ /^([\w\s]+)[:=]\s*(.*)/) {
82		my ($enum, $val) = (lc $1, lc $2);
83		$enum =~ tr/ _-//d;
84		$val =~ tr/ _-//d;
85
86		my $pa = $PropertyAlias{$enum} ? $enum : $PA_reverse{$enum};
87		my $f = $PropValueAlias{$pa}{$val} ? $val : $PVA_reverse{$pa}{lc $val};
88
89		if ($pa and $f) {
90		    $pa = "gc_sc" if $pa eq "gc" or $pa eq "sc";
91		    $file = "unicore/lib/$pa/$PVA_abbr_map{$pa}{lc $f}.pl";
92		    last GETFILE;
93		}
94	    }
95	    else {
96		my $t = lc $type;
97		$t =~ tr/ _-//d;
98
99		if ($PropValueAlias{gc}{$t} or $PropValueAlias{sc}{$t}) {
100		    $file = "unicore/lib/gc_sc/$PVA_abbr_map{gc_sc}{$t}.pl";
101		    last GETFILE;
102		}
103	    }
104
105            ##
106            ## See if it's in the direct mapping table.
107            ##
108            require "unicore/Exact.pl";
109            if (my $base = $utf8::Exact{$type}) {
110                $file = "unicore/lib/gc_sc/$base.pl";
111                last GETFILE;
112            }
113
114            ##
115            ## If not there exactly, try the canonical form. The canonical
116            ## form is lowercased, with any separators (\s+|[-_]) removed.
117            ##
118            my $canonical = lc $type;
119            $canonical =~ s/(?<=[a-z\d])(?:\s+|[-_])(?=[a-z\d])//g;
120            print "canonical = $canonical\n" if DEBUG;
121
122            require "unicore/Canonical.pl";
123            if (my $base = ($utf8::Canonical{$canonical} || $utf8::Canonical{ lc $utf8::PropertyAlias{$canonical} })) {
124                $file = "unicore/lib/gc_sc/$base.pl";
125                last GETFILE;
126            }
127
128	    ##
129	    ## See if it's a user-level "To".
130	    ##
131
132	    my $caller0 = caller(0);
133
134	    if (defined $caller0 && $type =~ /^To(?:\w+)$/) {
135		my $map = $caller0 . "::" . $type;
136
137		if (exists &{$map}) {
138		    no strict 'refs';
139
140		    $list = &{$map};
141		    last GETFILE;
142		}
143	    }
144
145            ##
146            ## Last attempt -- see if it's a standard "To" name
147	    ## (e.g. "ToLower")  ToTitle is used by ucfirst().
148	    ## The user-level way to access ToDigit() and ToFold()
149	    ## is to use Unicode::UCD.
150            ##
151            if ($type =~ /^To(Digit|Fold|Lower|Title|Upper)$/)
152            {
153                $file = "unicore/To/$1.pl";
154                ## would like to test to see if $file actually exists....
155                last GETFILE;
156            }
157
158            ##
159            ## If we reach this line, it's because we couldn't figure
160            ## out what to do with $type. Ouch.
161            ##
162
163            return $type;
164        }
165
166	if (defined $file) {
167	    print "found it (file='$file')\n" if DEBUG;
168
169	    ##
170	    ## If we reach here, it was due to a 'last GETFILE' above
171	    ## (exception: user-defined properties and mappings), so we
172	    ## have a filename, so now we load it if we haven't already.
173	    ## If we have, return the cached results. The cache key is the
174	    ## file to load.
175	    ##
176	    if ($Cache{$file} and ref($Cache{$file}) eq $class)
177	    {
178		print "Returning cached '$file' for \\p{$type}\n" if DEBUG;
179		return $Cache{$class, $file};
180	    }
181
182	    $list = do $file;
183	}
184
185        $ListSorted = 1; ## we know that these lists are sorted
186    }
187
188    my $extras;
189    my $bits = 0;
190
191    my $ORIG = $list;
192    if ($list) {
193	my @tmp = split(/^/m, $list);
194	my %seen;
195	no warnings;
196	$extras = join '', grep /^[^0-9a-fA-F]/, @tmp;
197	$list = join '',
198	    map  { $_->[1] }
199	    sort { $a->[0] <=> $b->[0] }
200	    map  { /^([0-9a-fA-F]+)/; [ hex($1), $_ ] }
201	    grep { /^([0-9a-fA-F]+)/ and not $seen{$1}++ } @tmp; # XXX doesn't do ranges right
202    }
203
204    if ($none) {
205	my $hextra = sprintf "%04x", $none + 1;
206	$list =~ s/\tXXXX$/\t$hextra/mg;
207    }
208
209    if ($minbits < 32) {
210	my $top = 0;
211	while ($list =~ /^([0-9a-fA-F]+)(?:[\t]([0-9a-fA-F]+)?)(?:[ \t]([0-9a-fA-F]+))?/mg) {
212	    my $min = hex $1;
213	    my $max = defined $2 ? hex $2 : $min;
214	    my $val = defined $3 ? hex $3 : 0;
215	    $val += $max - $min if defined $3;
216	    $top = $val if $val > $top;
217	}
218	$bits =
219	    $top > 0xffff ? 32 :
220	    $top > 0xff ? 16 :
221	    $top > 1 ? 8 : 1
222    }
223    $bits = $minbits if $bits < $minbits;
224
225    my @extras;
226    for my $x ($extras) {
227	pos $x = 0;
228	while ($x =~ /^([^0-9a-fA-F\n])(.*)/mg) {
229	    my $char = $1;
230	    my $name = $2;
231	    print STDERR "$1 => $2\n" if DEBUG;
232	    if ($char =~ /[-+!&]/) {
233		my ($c,$t) = split(/::/, $name, 2);	# bogus use of ::, really
234		my $subobj;
235		if ($c eq 'utf8') {
236		    $subobj = utf8->SWASHNEW($t, "", 0, 0, 0);
237		}
238		elsif (exists &$name) {
239		    $subobj = utf8->SWASHNEW($name, "", 0, 0, 0);
240		}
241		elsif ($c =~ /^([0-9a-fA-F]+)/) {
242		    $subobj = utf8->SWASHNEW("", $c, 0, 0, 0);
243		}
244		return $subobj unless ref $subobj;
245		push @extras, $name => $subobj;
246		$bits = $subobj->{BITS} if $bits < $subobj->{BITS};
247	    }
248	}
249    }
250
251    print STDERR "CLASS = $class, TYPE => $type, BITS => $bits, NONE => $none\nEXTRAS =>\n$extras\nLIST =>\n$list\n" if DEBUG;
252
253    my $SWASH = bless {
254	TYPE => $type,
255	BITS => $bits,
256	EXTRAS => $extras,
257	LIST => $list,
258	NONE => $none,
259	@extras,
260    } => $class;
261
262    if ($file) {
263        $Cache{$class, $file} = $SWASH;
264    }
265
266    return $SWASH;
267}
268
269# NOTE: utf8.c:swash_init() assumes entries are never modified once generated.
270
271sub SWASHGET {
272    # See utf8.c:Perl_swash_fetch for problems with this interface.
273    my ($self, $start, $len) = @_;
274    local $^D = 0 if $^D;
275    my $type = $self->{TYPE};
276    my $bits = $self->{BITS};
277    my $none = $self->{NONE};
278    print STDERR "SWASHGET @_ [$type/$bits/$none]\n" if DEBUG;
279    my $end = $start + $len;
280    my $swatch = "";
281    my $key;
282    vec($swatch, $len - 1, $bits) = 0;	# Extend to correct length.
283    if ($none) {
284	for $key (0 .. $len - 1) { vec($swatch, $key, $bits) = $none }
285    }
286
287    for ($self->{LIST}) {
288	pos $_ = 0;
289	if ($bits > 1) {
290	  LINE:
291	    while (/^([0-9a-fA-F]+)(?:[ \t]([0-9a-fA-F]+)?)?(?:[ \t]([0-9a-fA-F]+))?/mg) {
292		chomp;
293		my ($a, $b, $c) = ($1, $2, $3);
294		croak "$type: illegal mapping '$_'"
295		    if $type =~ /^To/ &&
296		       !(defined $a && defined $c);
297		my $min = hex $a;
298		my $max = defined $b ? hex $b : $min;
299		my $val = defined $c ? hex $c : 0;
300		next if $max < $start;
301		print "$min $max $val\n" if DEBUG;
302		if ($none) {
303		    if ($min < $start) {
304			$val += $start - $min if $val < $none;
305			$min = $start;
306		    }
307		    for ($key = $min; $key <= $max; $key++) {
308			last LINE if $key >= $end;
309			print STDERR "$key => $val\n" if DEBUG;
310			vec($swatch, $key - $start, $bits) = $val;
311			++$val if $val < $none;
312		    }
313		}
314		else {
315		    if ($min < $start) {
316			$val += $start - $min;
317			$min = $start;
318		    }
319		    for ($key = $min; $key <= $max; $key++, $val++) {
320			last LINE if $key >= $end;
321			print STDERR "$key => $val\n" if DEBUG;
322			vec($swatch, $key - $start, $bits) = $val;
323		    }
324		}
325	    }
326	}
327	else {
328	  LINE:
329	    while (/^([0-9a-fA-F]+)(?:[ \t]+([0-9a-fA-F]+))?/mg) {
330		chomp;
331		my $min = hex $1;
332		my $max = defined $2 ? hex $2 : $min;
333		next if $max < $start;
334		if ($min < $start) {
335		    $min = $start;
336		}
337		for ($key = $min; $key <= $max; $key++) {
338		    last LINE if $key >= $end;
339		    print STDERR "$key => 1\n" if DEBUG;
340		    vec($swatch, $key - $start, 1) = 1;
341		}
342	    }
343	}
344    }
345    for my $x ($self->{EXTRAS}) {
346	pos $x = 0;
347	while ($x =~ /^([-+!&])(.*)/mg) {
348	    my $char = $1;
349	    my $name = $2;
350	    print STDERR "INDIRECT $1 $2\n" if DEBUG;
351	    my $otherbits = $self->{$name}->{BITS};
352	    croak("SWASHGET size mismatch") if $bits < $otherbits;
353	    my $other = $self->{$name}->SWASHGET($start, $len);
354	    if ($char eq '+') {
355		if ($bits == 1 and $otherbits == 1) {
356		    $swatch |= $other;
357		}
358		else {
359		    for ($key = 0; $key < $len; $key++) {
360			vec($swatch, $key, $bits) = vec($other, $key, $otherbits);
361		    }
362		}
363	    }
364	    elsif ($char eq '!') {
365		if ($bits == 1 and $otherbits == 1) {
366		    $swatch |= ~$other;
367		}
368		else {
369		    for ($key = 0; $key < $len; $key++) {
370			if (!vec($other, $key, $otherbits)) {
371			    vec($swatch, $key, $bits) = 1;
372			}
373		    }
374		}
375	    }
376	    elsif ($char eq '-') {
377		if ($bits == 1 and $otherbits == 1) {
378		    $swatch &= ~$other;
379		}
380		else {
381		    for ($key = 0; $key < $len; $key++) {
382			if (vec($other, $key, $otherbits)) {
383			    vec($swatch, $key, $bits) = 0;
384			}
385		    }
386		}
387	    }
388	    elsif ($char eq '&') {
389		if ($bits == 1 and $otherbits == 1) {
390		    $swatch &= $other;
391		}
392		else {
393		    for ($key = 0; $key < $len; $key++) {
394			if (!vec($other, $key, $otherbits)) {
395			    vec($swatch, $key, $bits) = 0;
396			}
397		    }
398		}
399	    }
400	}
401    }
402    if (DEBUG) {
403	print STDERR "CELLS ";
404	for ($key = 0; $key < $len; $key++) {
405	    print STDERR vec($swatch, $key, $bits), " ";
406	}
407	print STDERR "\n";
408    }
409    $swatch;
410}
411
4121;
413