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 import os.path
   6 import re
   7 import sys
   8
   9 f = open(sys.argv[1] if len(sys.argv) > 1 else "StandardizedVariants.txt")
  10
  11 line = f.readline()
  12 m = re.compile("^# (StandardizedVariants(-\d+(\.\d+)*)?\.txt)").search(line)
  13 fileversion = m.group(1)
  14 vsdict = {}
  15 r = re.compile(
  16     "^([0-9A-F]{4,6}) (FE0[0-9A-F]); CJK COMPATIBILITY IDEOGRAPH-([0-9A-F]{4,6});"
  17 )
  18 while True:
  19     line = f.readline()
  20     if not line:
  21         break
  22     if "CJK COMPATIBILITY IDEOGRAPH-" not in line:
  23         continue
  24
  25     m = r.search(line)
  26     unified = int(m.group(1), 16)
  27     vs = int(m.group(2), 16)
  28     compat = int(m.group(3), 16)
  29
  30     if vs not in vsdict:
  31         vsdict[vs] = {}
  32     vsdict[vs][unified] = compat
  33
  34 f.close
  35
  36 offsets = []
  37 length = 10 + 11 * len(vsdict)
  38 for k, mappings in sorted(vsdict.items()):
  39     offsets.append(length)
  40     length += 4 + 5 * len(mappings)
  41
  42 f = open(sys.argv[2] if len(sys.argv) > 2 else "CJKCompatSVS.cpp", "wb")
  43 f.write(
  44     """// Generated by %s. Do not edit.
  45
  46 #include <stdint.h>
  47
  48 #define U16(v) (((v) >> 8) & 0xFF), ((v) & 0xFF)
  49 #define U24(v) (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
  50 #define U32(v) (((v) >> 24) & 0xFF), (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
  51 #define GLYPH(v) U16(v >= 0x2F800 ? (v) - (0x2F800 - 0xFB00) : (v))
  52
  53 // Fallback mappings for CJK Compatibility Ideographs Standardized Variants
  54 // taken from %s.
  55 // Using OpenType format 14 cmap subtable structure to reuse the lookup code
  56 // for fonts. The glyphID field is used to store the corresponding codepoints
  57 // CJK Compatibility Ideographs. To fit codepoints into the 16-bit glyphID
  58 // field, CJK Compatibility Ideographs Supplement (U+2F800..U+2FA1F) will be
  59 // mapped to 0xFB00..0xFD1F.
  60 extern const uint8_t sCJKCompatSVSTable[] = {
  61 """
  62     % (os.path.basename(sys.argv[0]), fileversion)
  63 )
  64 f.write("  U16(14), // format\n")
  65 f.write("  U32(%d), // length\n" % length)
  66 f.write("  U32(%d), // numVarSelectorRecords\n" % len(vsdict))
  67 for i, k in enumerate(sorted(vsdict.keys())):
  68     f.write(
  69         "    U24(0x%04X), U32(0), U32(%d), // varSelectorRecord[%d]\n"
  70         % (k, offsets[i], i)
  71     )
  72 for k, mappings in sorted(vsdict.items()):
  73     f.write("  // 0x%04X\n" % k)
  74     f.write("  U32(%d), // numUVSMappings\n" % len(mappings))
  75     for unified, compat in sorted(mappings.items()):
  76         f.write("    U24(0x%04X), GLYPH(0x%04X),\n" % (unified, compat))
  77 f.write(
  78     """};
  79
  80 #undef U16
  81 #undef U24
  82 #undef U32
  83 #undef GLYPH
  84
  85 static_assert(sizeof sCJKCompatSVSTable == %d, "Table generator has a bug.");
  86 """
  87     % length
  88 )