mdw@git.distorted.org.uk Git - disorder/blob - scripts/make-unidata

   1 #! /usr/bin/perl -w
   2 #
   3 # This file is part of DisOrder.
   4 # Copyright (C) 2007 Richard Kettlewell
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful, but
  12 # WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19 # USA
  20 #
  21 #
  22 # Generate Unicode support tables
  23 #
  24 # This script will download data from unicode.org if the required files
  25 # aren't in the current directory.
  26 #
  27 # After modifying this script you should run:
  28 #  make -C lib rebuild-unicode check
  29 #
  30 # Things not supported yet:
  31 #  - SpecialCasing.txt data for case mapping
  32 #  - Title case offsets
  33 #  - Some kind of hinting for composition
  34 #  - Word boundary support
  35 #  - ...
  36 #
  37 # NB the generated files DO NOT offer a stable ABI and so are not immediately
  38 # suitable for use in a general-purpose library.  Things that would need to
  39 # be done:
  40 #  - Hide unidata.h from applications; it will never be ABI- or even API-stable.
  41 #  - Stablized General_Category values
  42 #  - Extend the unicode.h API to general utility rather than just what
  43 #    DisOrder needs.
  44 #  - ...
  45 #
  46 use strict;
  47 use File::Basename;
  48
  49 sub out {
  50     print @_ or die "$!\n";
  51 }
  52
  53 sub key {
  54     my $d = shift;
  55     local $_;
  56
  57     return join("-", map($d->{$_}, sort keys %$d));
  58 }
  59
  60 # Size of a subtable
  61 #
  62 # This can be varied to trade off the number of subtables against their size.
  63 our $modulus = 128;
  64
  65 my %cats = ();                  # known general categories
  66 my %data = ();                  # mapping of codepoints to information
  67 my $max = 0;                    # maximum codepoint
  68 my $maxccc = 0;                 # maximum combining class
  69 my $maxud = 0;
  70 my $minud = 0;                  # max/min upper case offset
  71 my $maxld = 0;
  72 my $minld = 0;                  # max/min lower case offset
  73
  74 # Make sure we have our desired input files.  We explicitly specify a
  75 # Unicode standard version to make sure that a given version of DisOrder
  76 # supports a given version of Unicode.
  77 sub input {
  78     my $path = shift;
  79     my $lpath = basename($path);
  80     if(!-e $lpath) {
  81         system("wget http://www.unicode.org/Public/5.0.0/ucd/$path");
  82         chmod(0444, $lpath) or die "$lpath: $!\n";
  83     }
  84     open(STDIN, "<$lpath") or die "$lpath: $!\n";
  85 }
  86
  87
  88 # Read the main data file
  89 input("UnicodeData.txt");
  90 while(<>) {
  91     my @f = split(/;/, $_);
  92     my $c = hex($f[0]);         # codepoint
  93     next if $c >= 0xE0000;      # ignore various high-numbered stuff
  94     # TODO justify this exclusion!
  95     my $name = $f[1];
  96     my $gc = $f[2];             # General_Category
  97     my $ccc = $f[3];            # Canonical_Combining_Class
  98     my $dm = $f[5];             # Decomposition_Type + Decomposition_Mapping
  99     my $sum = hex($f[12]) || $c; # Simple_Uppercase_Mapping
 100     my $slm = hex($f[13]) || $c; # Simple_Lowercase_Mapping
 101     # recalculate the upper/lower case mappings as offsets
 102     my $ud = $sum - $c;
 103     my $ld = $slm - $c;
 104     # update bounds on various values
 105     $maxccc = $ccc if $ccc > $maxccc; # assumed never to be -ve
 106     $minud = $ud if $ud < $minud;
 107     $maxud = $ud if $ud > $maxud;
 108     $minld = $ld if $ld < $minld;
 109     $maxld = $ld if $ld > $maxld;
 110     $data{$c} = {
 111         "gc" => $gc,
 112         "ccc" => $ccc,
 113         "ud" => $ud,
 114         "ld" => $ld,
 115         };
 116     if($dm ne '') {
 117         if($dm !~ /</) {
 118             # This is a canonical decomposition
 119             $data{$c}->{canon} = $dm;
 120             $data{$c}->{compat} = $dm;
 121         } else {
 122             # This is only a compatibility decomposition
 123             $dm =~ s/^<.*>\s*//;
 124             $data{$c}->{compat} = $dm;
 125         }
 126     }
 127     $cats{$gc} = 1;
 128     $max = $c if $c > $max;
 129 }
 130
 131 sub read_prop_with_ranges {
 132     my $path = shift;
 133     my $propkey = shift;
 134     input($path);
 135     while(<>) {
 136         chomp;
 137         s/\s*\#.*//;
 138         next if $_ eq '';
 139         my ($range, $propval) = split(/\s*;\s*/, $_);
 140         if($range =~ /(.*)\.\.(.*)/) {
 141             for my $c (hex($1) .. hex($2)) {
 142                 if(exists $data{$c}) {
 143                     $data{$c}->{$propkey} = $propval;
 144                 }
 145             }
 146         } else {
 147             my $c = hex($range);
 148             if(exists $data{$c}) {
 149                 $data{$c}->{$propkey} = $propval;
 150             }
 151         }
 152     }
 153 }
 154
 155 # Grapheme_Break etc
 156 # NB we do this BEFORE filling in blanks so that the Hangul characters
 157 # don't get filled in; we can compute their properties mechanically.
 158 read_prop_with_ranges("auxiliary/GraphemeBreakProperty.txt", "gbreak");
 159 read_prop_with_ranges("auxiliary/WordBreakProperty.txt", "wbreak");
 160 read_prop_with_ranges("auxiliary/SentenceBreakProperty.txt", "sbreak");
 161
 162 # Compute the full list and fill in the Extend category properly
 163 my %gbreak = ();
 164 my %wbreak = ();
 165 my %sbreak = ();
 166 for my $c (keys %data) {
 167     if(!exists $data{$c}->{gbreak}) {
 168         $data{$c}->{gbreak} = 'Other';
 169     }
 170     $gbreak{$data{$c}->{gbreak}} = 1;
 171
 172     if(!exists $data{$c}->{wbreak}) {
 173         if($data{$c}->{gbreak} eq 'Extend') {
 174             $data{$c}->{wbreak} = 'Extend';
 175         } else {
 176             $data{$c}->{wbreak} = 'Other';
 177         }
 178     }
 179     $wbreak{$data{$c}->{wbreak}} = 1;
 180
 181     if(!exists $data{$c}->{sbreak}) {
 182         if($data{$c}->{gbreak} eq 'Extend') {
 183             $data{$c}->{sbreak} = 'Extend';
 184         } else {
 185             $data{$c}->{sbreak} = 'Other';
 186         }
 187     }
 188     $sbreak{$data{$c}->{sbreak}} = 1;
 189 }
 190
 191 # Round up the maximum value to a whole number of subtables
 192 $max += ($modulus - 1) - ($max % $modulus);
 193
 194 # Make sure there are no gaps
 195 for(my $c = 0; $c <= $max; ++$c) {
 196     if(!exists $data{$c}) {
 197         $data{$c} = {
 198             "gc" => "Cn",       # not assigned
 199             "ccc" => 0,
 200             "ud" => 0,
 201             "ld" => 0,
 202             "wbreak" => 'Other',
 203             "gbreak" => 'Other',
 204             "sbreak" => 'Other',
 205             };
 206     }
 207 }
 208 $cats{'Cn'} = 1;
 209
 210 # Read the casefolding data too
 211 input("CaseFolding.txt");
 212 while(<>) {
 213     chomp;
 214     next if /^\#/ or $_ eq '';
 215     my @f = split(/\s*;\s*/, $_);
 216     # Full case folding means use status C and F.
 217     # We discard status T, Turkish users may wish to change this.
 218     if($f[1] eq 'C' or $f[1] eq 'F') {
 219         my $c = hex($f[0]);
 220         $data{$c}->{casefold} = $f[2];
 221         # We are particularly interest in combining characters that
 222         # case-fold to non-combining characters, or characters that
 223         # case-fold to sequences with combining characters in non-initial
 224         # positions, as these required decomposiiton before case-folding
 225         my @d = map(hex($_), split(/\s+/, $data{$c}->{casefold}));
 226         if($data{$c}->{ccc} != 0) {
 227             # This is a combining character
 228             if($data{$d[0]}->{ccc} == 0) {
 229                 # The first character of its case-folded form is NOT
 230                 # a combining character.  The field name is the example
 231                 # explicitly mentioned in the spec.
 232                 $data{$c}->{ypogegrammeni} = 1;
 233             }
 234         } else {
 235             # This is a non-combining character; inspect the non-initial
 236             # code points of the case-folded sequence
 237             shift(@d);
 238             if(grep($data{$_}->{ccc} != 0, @d)) {
 239                 # Some non-initial code point in the case-folded for is NOT a
 240                 # a combining character.
 241                 $data{$c}->{ypogegrammeni} = 1;
 242             }
 243         }
 244     }
 245 }
 246
 247 # Generate the header file
 248 open(STDOUT, ">unidata.h") or die "unidata.h: $!\n";
 249
 250 out("/* Automatically generated file, see scripts/make-unidata */\n",
 251     "#ifndef UNIDATA_H\n",
 252     "#define UNIDATA_H\n");
 253
 254 # TODO choose stable values for General_Category
 255 out("enum unicode_General_Category {\n",
 256     join(",\n",
 257          map("  unicode_General_Category_$_", sort keys %cats)), "\n};\n");
 258
 259 out("enum unicode_Grapheme_Break {\n",
 260     join(",\n",
 261          map("  unicode_Grapheme_Break_$_", sort keys %gbreak)),
 262     "\n};\n");
 263 out("extern const char *const unicode_Grapheme_Break_names[];\n");
 264
 265 out("enum unicode_Word_Break {\n",
 266     join(",\n",
 267          map("  unicode_Word_Break_$_", sort keys %wbreak)),
 268     "\n};\n");
 269 out("extern const char *const unicode_Word_Break_names[];\n");
 270
 271 out("enum unicode_Sentence_Break {\n",
 272     join(",\n",
 273          map("  unicode_Sentence_Break_$_", sort keys %sbreak)),
 274     "\n};\n");
 275 out("extern const char *const unicode_Sentence_Break_names[];\n");
 276
 277 out("enum unicode_flags {\n",
 278     "  unicode_normalize_before_casefold = 1\n",
 279     "};\n",
 280     "\n");
 281
 282 # Choose the narrowest type that will fit the required values
 283 sub choosetype {
 284     my ($min, $max) = @_;
 285     if($min >= 0) {
 286         return "char" if $max <= 127;
 287         return "unsigned char" if $max <= 255;
 288         return "int16_t" if $max < 32767;
 289         return "uint16_t" if $max < 65535;
 290         return "int32_t";
 291     } else {
 292         return "char" if $min >= -127 && $max <= 127;
 293         return "int16_t" if $min >= -32767 && $max <= 32767;
 294         return "int32_t";
 295     }
 296 }
 297
 298 out("struct unidata {\n",
 299     "  const uint32_t *compat;\n",
 300     "  const uint32_t *canon;\n",
 301     "  const uint32_t *casefold;\n",
 302     "  ".choosetype($minud, $maxud)." upper_offset;\n",
 303     "  ".choosetype($minld, $maxld)." lower_offset;\n",
 304     "  ".choosetype(0, $maxccc)." ccc;\n",
 305     "  char general_category;\n",
 306     "  uint8_t flags;\n",
 307     "  char grapheme_break;\n",
 308     "  char word_break;\n",
 309     "  char sentence_break;\n",
 310     "};\n");
 311 # compat, canon and casefold do have have non-BMP characters, so we
 312 # can't use a simple 16-bit table.  We could use UTF-8 or UTF-16
 313 # though, saving a bit of space (probably not that much...) at the
 314 # cost of marginally reduced performance and additional complexity
 315
 316 out("extern const struct unidata *const unidata[];\n");
 317
 318 out("#define UNICODE_NCHARS ", ($max + 1), "\n");
 319 out("#define UNICODE_MODULUS $modulus\n");
 320
 321 out("#endif\n");
 322
 323 close STDOUT or die "unidata.h: $!\n";
 324
 325 open(STDOUT, ">unidata.c") or die "unidata.c: $!\n";
 326
 327 out("/* Automatically generated file, see scripts/make-unidata */\n",
 328     "#include <config.h>\n",
 329     "#include \"types.h\"\n",
 330     "#include \"unidata.h\"\n");
 331
 332 # Short aliases to keep .c file small
 333
 334 out(map(sprintf("#define %s unicode_General_Category_%s\n", $_, $_),
 335         sort keys %cats));
 336 out(map(sprintf("#define GB%s unicode_Grapheme_Break_%s\n", $_, $_),
 337         sort keys %gbreak));
 338 out(map(sprintf("#define WB%s unicode_Word_Break_%s\n", $_, $_),
 339         sort keys %wbreak));
 340 out(map(sprintf("#define SB%s unicode_Sentence_Break_%s\n", $_, $_),
 341         sort keys %sbreak));
 342
 343 # Names for *_Break properties
 344 out("const char *const unicode_Grapheme_Break_names[] = {\n",
 345     join(",\n",
 346          map("  \"$_\"", sort keys %gbreak)),
 347     "\n};\n");
 348 out("const char *const unicode_Word_Break_names[] = {\n",
 349     join(",\n",
 350          map("  \"$_\"", sort keys %wbreak)),
 351     "\n};\n");
 352 out("const char *const unicode_Sentence_Break_names[] = {\n",
 353     join(",\n",
 354          map("  \"$_\"", sort keys %sbreak)),
 355     "\n};\n");
 356
 357 # Generate the decomposition mapping tables.  We look out for duplicates
 358 # in order to save space and report this as decompsaved at the end.  In
 359 # Unicode 5.0.0 this saves 1795 entries, which is at least 14Kbytes.
 360 my $decompnum = 0;
 361 my %decompnums = ();
 362 my $decompsaved = 0;
 363 out("static const uint32_t ");
 364 for(my $c = 0; $c <= $max; ++$c) {
 365     # If canon is set then compat will be too and will be identical.
 366     # If compat is set the canon might be clear.  So we use the
 367     # compat version and fix up the symbols after.
 368     if(exists $data{$c}->{compat}) {
 369         my $s = join(",",
 370                      (map(hex($_), split(/\s+/, $data{$c}->{compat})), 0));
 371         if(!exists $decompnums{$s}) {
 372             out(",\n") if $decompnum != 0;
 373             out("cd$decompnum\[]={$s}");
 374             $decompnums{$s} = $decompnum++;
 375         } else {
 376             ++$decompsaved;
 377         }
 378         $data{$c}->{compatsym} = "cd$decompnums{$s}";
 379         if(exists $data{$c}->{canon}) {
 380             $data{$c}->{canonsym} = "cd$decompnums{$s}";
 381         }
 382     }
 383 }
 384 out(";\n");
 385
 386 # ...and the case folding table.  Again we compress equal entries to save
 387 # space.  In Unicode 5.0.0 this saves 51 entries or at least 408 bytes.
 388 # This doesns't seem as worthwhile as the decomposition mapping saving above.
 389 my $cfnum = 0;
 390 my %cfnums = ();
 391 my $cfsaved = 0;
 392 out("static const uint32_t ");
 393 for(my $c = 0; $c <= $max; ++$c) {
 394     if(exists $data{$c}->{casefold}) {
 395         my $s = join(",",
 396                      (map(hex($_), split(/\s+/, $data{$c}->{casefold})), 0));
 397         if(!exists $cfnums{$s}) {
 398             out(",\n") if $cfnum != 0;
 399             out("cf$cfnum\[]={$s}");
 400             $cfnums{$s} = $cfnum++;
 401         } else {
 402             ++$cfsaved;
 403         }
 404         $data{$c}->{cfsym} = "cf$cfnums{$s}";
 405     }
 406 }
 407 out(";\n");
 408
 409 # Visit all the $modulus-character blocks in turn and generate the
 410 # required subtables.  As above we spot duplicates to save space.  In
 411 # Unicode 5.0.0 with $modulus=128 and current table data this saves
 412 # 1372 subtables or at least three and a half megabytes on 32-bit
 413 # platforms.
 414
 415 my %subtable = ();              # base->subtable number
 416 my %subtableno = ();            # subtable number -> content
 417 my $subtablecounter = 0;        # counter for subtable numbers
 418 my $subtablessaved = 0;         # number of tables saved
 419 for(my $base = 0; $base <= $max; $base += $modulus) {
 420     my @t;
 421     for(my $c = $base; $c < $base + $modulus; ++$c) {
 422         my $d = $data{$c};
 423         my $canonsym = ($data{$c}->{canonsym} or "0");
 424         my $compatsym = ($data{$c}->{compatsym} or "0");
 425         my $cfsym = ($data{$c}->{cfsym} or "0");
 426         my @flags = ();
 427         if($data{$c}->{ypogegrammeni}) {
 428             push(@flags, "unicode_normalize_before_casefold");
 429         }
 430         my $flags = @flags ? join("|", @flags) : 0;
 431         push(@t, "{".
 432              join(",",
 433                   $compatsym,
 434                   $canonsym,
 435                   $cfsym,
 436                   $d->{ud},
 437                   $d->{ld},
 438                   $d->{ccc},
 439                   $d->{gc},
 440                   $flags,
 441                   "GB$d->{gbreak}",
 442                   "WB$d->{wbreak}",
 443                   "SB$d->{sbreak}",
 444              )."}");
 445     }
 446     my $t = join(",\n", @t);
 447     if(!exists $subtable{$t}) {
 448         out("static const struct unidata st$subtablecounter\[] = {\n",
 449             "$t\n",
 450             "};\n");
 451         $subtable{$t} = $subtablecounter++;
 452     } else {
 453         ++$subtablessaved;
 454     }
 455     $subtableno{$base} = $subtable{$t};
 456 }
 457
 458 out("const struct unidata*const unidata[]={\n");
 459 for(my $base = 0; $base <= $max; $base += $modulus) {
 460     out("st$subtableno{$base},\n");
 461 }
 462 out("};\n");
 463
 464 close STDOUT or die "unidata.c: $!\n";
 465
 466 print STDERR "max=$max, subtables=$subtablecounter, subtablessaved=$subtablessaved\n";
 467 print STDERR "decompsaved=$decompsaved cfsaved=$cfsaved\n";