gecko-dev/layout/tools/gensymmtable.pl

#!/usr/local/bin/perl
#
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is IBM code.
#
# The Initial Developer of the Original Code is
# IBM. Portions created by IBM are Copyright (C) International Business Machines Corporation, 2000.  All Rights Reserved.
# Portions created by the Initial Developer are Copyright (C) 2001
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Simon Montagu
#
# Alternatively, the contents of this file may be used under the terms of
# either of the GNU General Public License Version 2 or later (the "GPL"),
# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

# This program generates the header file symmtable.h from the Unicode
# informative data file BidiMirroring.txt.
# See the comments in that file for details of its structure and contents.
#
# At the moment we only handle cases where there is another Unicode
# character whose glyph can serve as at least an adequate version of
# the mirror image of the original character's glyph. This leaves open
# the problem of how to provide mirrored glyphs for characters where
# this is not the case.

# Process the input file
$ucp = "[0-9a-fA-F]{4}";               # Unicode code point (4 successive hex digits) as a pattern to match
open ( UNICODATA , "< BidiMirroring.txt") 
   || die "Cannot find BidiMirroring.txt.\
The file should be avaiable here:\
http://www.unicode.org/Public/UNIDATA/BidiMirroring.txt\n";

while (<UNICODATA>) {
	chop;
  if (/^($ucp); ($ucp) # (.+)/) {      # If the line looks like this pattern
                                       # (example: 0028; 0029 # LEFT PARENTHESIS)
    @table[hex($1)]=hex($1) ^ hex($2); # Enter the character XOR its symmetric pair in the table
    @isblock[hex(substr($1, 0, 2))]=1; # Remember this block
  }
}
close(UNICODATA);

# Generate license and header
open ( OUT , "> ../base/src/symmtable.h") 
  || die "cannot open output ../base/src/symmtable.h file";
$npl = <<END_OF_NPL;
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is IBM code.
 *
 * The Initial Developer of the Original Code is
 * International Business Machines Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
 
/* 
    DO NOT EDIT THIS DOCUMENT !!! THIS DOCUMENT IS GENERATED BY
    mozilla/intl/unicharutil/tools/gensymmtable.pl
 */
END_OF_NPL
print OUT $npl;

# Generate data tables
foreach $block (0 .. 0xff) {
  if (@isblock[$block]) {
    printf OUT "\n/* Block U%02X__ */\n", $block;
    printf OUT "const static PRUint8 symmtable_%02X[256] = {\n", $block;
    print OUT "/*      ";
    foreach $byte (0 .. 0xf) {
      printf OUT "   _%X ", $byte;
    }
    print OUT "*/\n";
    foreach $row (0 .. 0xf) {
      printf OUT "/* %X_ */ ", $row;
      foreach $byte (0 .. 0xf) {
         $ix = ($block << 8) | ($row << 4) | ($byte);
         printf OUT ("%#4x, ", @table[$ix]);
      }
      print OUT "\n";
    }
    print OUT "};\n";
  }
}

# Generate conversion method
print OUT "\nstatic PRUint32 Mirrored(PRUint32 u)\n{\n";
print OUT "  switch (u & 0xFFFFFF00) {\n";
print OUT "    // XOR the character with the bitmap in the conversion table to give the symmetric equivalent\n";
foreach $block (0 .. 0xff) {
  if (1==@isblock[$block]) {
    printf OUT "    case %#x:\n", $block * 256;
    printf OUT "      u ^= symmtable_%02X[u & 0xff];\n", $block;
    print  OUT "      break;\n";
  }
}
print OUT "  }\n  return u;\n}\n";
close(OUT);