lib/perl5/5.8.8/utf8_heavy.pl

   1 package utf8;
   2 use strict;
   3 use warnings;
   4
   5 sub DEBUG () { 0 }
   6
   7 sub DESTROY {}
   8
   9 my %Cache;
  10
  11 our (%PropertyAlias, %PA_reverse, %PropValueAlias, %PVA_reverse, %PVA_abbr_map);
  12
  13 sub 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
  20 sub 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 $SWASH;
 267 }
 268
 269 # NOTE: utf8.c:swash_init() assumes entries are never modified once generated.
 270
 271 sub SWASHGET {
 272     # See utf8.c:Perl_swash_fetch for problems with this interface.
 273     my ($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
 412 1;