pcre/dftables

   1 #!/usr/bin/perl -w
   2 #
   3 # This is JavaScriptCore's variant of the PCRE library. While this library
   4 # started out as a copy of PCRE, many of the features of PCRE have been
   5 # removed. This library now supports only the regular expression features
   6 # required by the JavaScript language specification, and has only the functions
   7 # needed by JavaScriptCore and the rest of WebKit.
   8 #
   9 #                  Originally written by Philip Hazel
  10 #            Copyright (c) 1997-2006 University of Cambridge
  11 #  Copyright (C) 2002, 2004, 2006, 2007, 2008, 2009 Apple Inc.  All rights reserved.
  12 #
  13 # -----------------------------------------------------------------------------
  14 # Redistribution and use in source and binary forms, with or without
  15 # modification, are permitted provided that the following conditions are met:
  16 #
  17 #     * Redistributions of source code must retain the above copyright notice,
  18 #       this list of conditions and the following disclaimer.
  19 #
  20 #     * Redistributions in binary form must reproduce the above copyright
  21 #       notice, this list of conditions and the following disclaimer in the
  22 #       documentation and/or other materials provided with the distribution.
  23 #
  24 #     * Neither the name of the University of Cambridge nor the names of its
  25 #       contributors may be used to endorse or promote products derived from
  26 #       this software without specific prior written permission.
  27 #
  28 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  29 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  32 # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  34 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  35 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  36 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  37 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 # POSSIBILITY OF SUCH DAMAGE.
  39 # -----------------------------------------------------------------------------
  40
  41 # This is a freestanding support program to generate a file containing
  42 # character tables. The tables are built according to the default C
  43 # locale.
  44
  45 use strict;
  46
  47 use File::Basename;
  48 use File::Spec;
  49 use File::Temp qw(tempfile);
  50 use Getopt::Long;
  51
  52 sub readHeaderValues();
  53
  54 my %pcre_internal;
  55
  56 if (scalar(@ARGV) < 1) {
  57     print STDERR "Usage: ", basename($0), " [--preprocessor=program] output-file\n";
  58     exit 1;
  59 }
  60
  61 my $outputFile;
  62 my $preprocessor;
  63 GetOptions('preprocessor=s' => \$preprocessor);
  64 if (not $preprocessor) {
  65     $preprocessor = "cpp";
  66 }
  67
  68 $outputFile = $ARGV[0];
  69 die('Must specify output file.') unless defined($outputFile);
  70
  71 readHeaderValues();
  72
  73 open(OUT, ">", $outputFile) or die "$!";
  74 binmode(OUT);
  75
  76 printf(OUT
  77     "/*************************************************\n" .
  78     "*      Perl-Compatible Regular Expressions       *\n" .
  79     "*************************************************/\n\n" .
  80     "/* This file is automatically written by the dftables auxiliary \n" .
  81     "program. If you edit it by hand, you might like to edit the Makefile to \n" .
  82     "prevent its ever being regenerated.\n\n");
  83 printf(OUT
  84     "This file contains the default tables for characters with codes less than\n" .
  85     "128 (ASCII characters). These tables are used when no external tables are\n" .
  86     "passed to PCRE. */\n\n" .
  87     "const unsigned char jsc_pcre_default_tables[%d] = {\n\n" .
  88     "/* This table is a lower casing table. */\n\n", $pcre_internal{tables_length});
  89
  90 if ($pcre_internal{lcc_offset} != 0) {
  91     die "lcc_offset != 0";
  92 }
  93
  94 printf(OUT "  ");
  95 for (my $i = 0; $i < 128; $i++) {
  96     if (($i & 7) == 0 && $i != 0) {
  97         printf(OUT "\n  ");
  98     }
  99     printf(OUT "0x%02X", ord(lc(chr($i))));
 100     if ($i != 127) {
 101         printf(OUT ", ");
 102     }
 103 }
 104 printf(OUT ",\n\n");
 105
 106 printf(OUT "/* This table is a case flipping table. */\n\n");
 107
 108 if ($pcre_internal{fcc_offset} != 128) {
 109   die "fcc_offset != 128";
 110 }
 111
 112 printf(OUT "  ");
 113 for (my $i = 0; $i < 128; $i++) {
 114     if (($i & 7) == 0 && $i != 0) {
 115         printf(OUT "\n  ");
 116     }
 117     my $c = chr($i);
 118     printf(OUT "0x%02X", $c =~ /[[:lower:]]/ ? ord(uc($c)) : ord(lc($c)));
 119     if ($i != 127) {
 120         printf(OUT ", ");
 121     }
 122 }
 123 printf(OUT ",\n\n");
 124
 125 printf(OUT
 126     "/* This table contains bit maps for various character classes.\n" .
 127     "Each map is 32 bytes long and the bits run from the least\n" .
 128     "significant end of each byte. The classes are: space, digit, word. */\n\n");
 129
 130 if ($pcre_internal{cbits_offset} != $pcre_internal{fcc_offset} + 128) {
 131     die "cbits_offset != fcc_offset + 128";
 132 }
 133
 134 my @cbit_table = (0) x $pcre_internal{cbit_length};
 135 for (my $i = ord('0'); $i <= ord('9'); $i++) {
 136     $cbit_table[$pcre_internal{cbit_digit} + $i / 8] |= 1 << ($i & 7);
 137 }
 138 $cbit_table[$pcre_internal{cbit_word} + ord('_') / 8] |= 1 << (ord('_') & 7);
 139 for (my $i = 0; $i < 128; $i++) {
 140     my $c = chr($i);
 141     if ($c =~ /[[:alnum:]]/) {
 142         $cbit_table[$pcre_internal{cbit_word} + $i / 8] |= 1 << ($i & 7);
 143     }
 144     if ($c =~ /[[:space:]]/) {
 145         $cbit_table[$pcre_internal{cbit_space} + $i / 8] |= 1 << ($i & 7);
 146     }
 147 }
 148
 149 printf(OUT "  ");
 150 for (my $i = 0; $i < $pcre_internal{cbit_length}; $i++) {
 151     if (($i & 7) == 0 && $i != 0) {
 152         if (($i & 31) == 0) {
 153             printf(OUT "\n");
 154         }
 155         printf(OUT "\n  ");
 156     }
 157     printf(OUT "0x%02X", $cbit_table[$i]);
 158     if ($i != $pcre_internal{cbit_length} - 1) {
 159         printf(OUT ", ");
 160     }
 161 }
 162 printf(OUT ",\n\n");
 163
 164 printf(OUT
 165     "/* This table identifies various classes of character by individual bits:\n" .
 166     "  0x%02x   white space character\n" .
 167     "  0x%02x   hexadecimal digit\n" .
 168     "  0x%02x   alphanumeric or '_'\n*/\n\n",
 169     $pcre_internal{ctype_space}, $pcre_internal{ctype_xdigit}, $pcre_internal{ctype_word});
 170
 171 if ($pcre_internal{ctypes_offset} != $pcre_internal{cbits_offset} + $pcre_internal{cbit_length}) {
 172     die "ctypes_offset != cbits_offset + cbit_length";
 173 }
 174
 175 printf(OUT "  ");
 176 for (my $i = 0; $i < 128; $i++) {
 177     my $x = 0;
 178     my $c = chr($i);
 179     if ($c =~ /[[:space:]]/) {
 180         $x += $pcre_internal{ctype_space};
 181     }
 182     if ($c =~ /[[:xdigit:]]/) {
 183         $x += $pcre_internal{ctype_xdigit};
 184     }
 185     if ($c =~ /[[:alnum:]_]/) {
 186         $x += $pcre_internal{ctype_word};
 187     }
 188     printf(OUT "0x%02X", $x);
 189     if ($i != 127) {
 190         printf(OUT ", ");
 191     } else {
 192         printf(OUT "};");
 193     }
 194     if (($i & 7) == 7) {
 195         printf(OUT " /* ");
 196         my $d = chr($i - 7);
 197         if ($d =~ /[[:print:]]/) {
 198             printf(OUT " %c -", $i - 7);
 199         } else {
 200             printf(OUT "%3d-", $i - 7);
 201         }
 202         if ($c =~ m/[[:print:]]/) {
 203             printf(OUT " %c ", $i);
 204         } else {
 205             printf(OUT "%3d", $i);
 206         }
 207         printf(OUT " */\n");
 208         if ($i != 127) {
 209             printf(OUT "  ");
 210         }
 211     }
 212 }
 213
 214 if ($pcre_internal{tables_length} != $pcre_internal{ctypes_offset} + 128) {
 215     die "tables_length != ctypes_offset + 128";
 216 }
 217
 218 printf(OUT "\n\n/* End of chartables.c */\n");
 219
 220 close(OUT);
 221
 222 exit 0;
 223
 224 sub readHeaderValues()
 225 {
 226     my @variables = qw(
 227         cbit_digit
 228         cbit_length
 229         cbit_space
 230         cbit_word
 231         cbits_offset
 232         ctype_space
 233         ctype_word
 234         ctype_xdigit
 235         ctypes_offset
 236         fcc_offset
 237         lcc_offset
 238         tables_length
 239     );
 240
 241     local $/ = undef;
 242
 243     my $headerPath = File::Spec->catfile(dirname($0), "pcre_internal.h");
 244
 245     my ($fh, $tempFile) = tempfile(
 246         basename($0) . "-XXXXXXXX",
 247         DIR => File::Spec->tmpdir(),
 248         SUFFIX => ".in",
 249         UNLINK => 0,
 250     );
 251
 252     print $fh "#define DFTABLES\n\n";
 253
 254     open(HEADER, "<", $headerPath) or die "$!";
 255     print $fh <HEADER>;
 256     close(HEADER);
 257
 258     print $fh "\n\n";
 259
 260     for my $v (@variables) {
 261         print $fh "\$pcre_internal{\"$v\"} = $v;\n";
 262     }
 263
 264     close($fh);
 265
 266     open(CPP, "$preprocessor \"$tempFile\" |") or die "$!";
 267     my $content = <CPP>;
 268     close(CPP);
 269
 270     eval $content;
 271     die "$@" if $@;
 272     unlink $tempFile;
 273 }