gfx/thebes/gencjkcisvs.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3 # You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 from __future__ import absolute_import
   6 import os.path
   7 import re
   8 import sys
   9
  10 f = open(sys.argv[1] if len(sys.argv) > 1 else 'StandardizedVariants.txt')
  11
  12 line = f.readline()
  13 m = re.compile('^# (StandardizedVariants(-\d+(\.\d+)*)?\.txt)').search(line)
  14 fileversion = m.group(1)
  15 vsdict = {}
  16 r = re.compile('^([0-9A-F]{4,6}) (FE0[0-9A-F]); CJK COMPATIBILITY IDEOGRAPH-([0-9A-F]{4,6});')
  17 while True:
  18     line = f.readline()
  19     if not line:
  20         break
  21     if 'CJK COMPATIBILITY IDEOGRAPH-' not in line:
  22         continue
  23
  24     m = r.search(line)
  25     unified = int(m.group(1), 16)
  26     vs = int(m.group(2), 16)
  27     compat = int(m.group(3), 16)
  28
  29     if vs not in vsdict:
  30         vsdict[vs] = {}
  31     vsdict[vs][unified] = compat
  32
  33 f.close
  34
  35 offsets = []
  36 length = 10 + 11 * len(vsdict)
  37 for (k, mappings) in sorted(vsdict.items()):
  38     offsets.append(length)
  39     length += 4 + 5 * len(mappings)
  40
  41 f = open(sys.argv[2] if len(sys.argv) > 2 else 'CJKCompatSVS.cpp', 'wb')
  42 f.write("""// Generated by %s. Do not edit.
  43
  44 #include <stdint.h>
  45
  46 #define U16(v) (((v) >> 8) & 0xFF), ((v) & 0xFF)
  47 #define U24(v) (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
  48 #define U32(v) (((v) >> 24) & 0xFF), (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
  49 #define GLYPH(v) U16(v >= 0x2F800 ? (v) - (0x2F800 - 0xFB00) : (v))
  50
  51 // Fallback mappings for CJK Compatibility Ideographs Standardized Variants
  52 // taken from %s.
  53 // Using OpenType format 14 cmap subtable structure to reuse the lookup code
  54 // for fonts. The glyphID field is used to store the corresponding codepoints
  55 // CJK Compatibility Ideographs. To fit codepoints into the 16-bit glyphID
  56 // field, CJK Compatibility Ideographs Supplement (U+2F800..U+2FA1F) will be
  57 // mapped to 0xFB00..0xFD1F.
  58 extern const uint8_t sCJKCompatSVSTable[] = {
  59 """ % (os.path.basename(sys.argv[0]), fileversion))
  60 f.write('  U16(14), // format\n')
  61 f.write('  U32(%d), // length\n' % length)
  62 f.write('  U32(%d), // numVarSelectorRecords\n' % len(vsdict))
  63 for i, k in enumerate(sorted(vsdict.keys())):
  64     f.write('    U24(0x%04X), U32(0), U32(%d), // varSelectorRecord[%d]\n' % (k, offsets[i], i))
  65 for (k, mappings) in sorted(vsdict.items()):
  66     f.write('  // 0x%04X\n' % k)
  67     f.write('  U32(%d), // numUVSMappings\n' % len(mappings))
  68     for (unified, compat) in sorted(mappings.items()):
  69         f.write('    U24(0x%04X), GLYPH(0x%04X),\n' % (unified, compat))
  70 f.write("""};
  71
  72 #undef U16
  73 #undef U24
  74 #undef U32
  75 #undef GLYPH
  76
  77 static_assert(sizeof sCJKCompatSVSTable == %d, "Table generator has a bug.");
  78 """ % length)