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(
  17     "^([0-9A-F]{4,6}) (FE0[0-9A-F]); CJK COMPATIBILITY IDEOGRAPH-([0-9A-F]{4,6});"
  18 )
  19 while True:
  20     line = f.readline()
  21     if not line:
  22         break
  23     if "CJK COMPATIBILITY IDEOGRAPH-" not in line:
  24         continue
  25
  26     m = r.search(line)
  27     unified = int(m.group(1), 16)
  28     vs = int(m.group(2), 16)
  29     compat = int(m.group(3), 16)
  30
  31     if vs not in vsdict:
  32         vsdict[vs] = {}
  33     vsdict[vs][unified] = compat
  34
  35 f.close
  36
  37 offsets = []
  38 length = 10 + 11 * len(vsdict)
  39 for (k, mappings) in sorted(vsdict.items()):
  40     offsets.append(length)
  41     length += 4 + 5 * len(mappings)
  42
  43 f = open(sys.argv[2] if len(sys.argv) > 2 else "CJKCompatSVS.cpp", "wb")
  44 f.write(
  45     """// Generated by %s. Do not edit.
  46
  47 #include <stdint.h>
  48
  49 #define U16(v) (((v) >> 8) & 0xFF), ((v) & 0xFF)
  50 #define U24(v) (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
  51 #define U32(v) (((v) >> 24) & 0xFF), (((v) >> 16) & 0xFF), (((v) >> 8) & 0xFF), ((v) & 0xFF)
  52 #define GLYPH(v) U16(v >= 0x2F800 ? (v) - (0x2F800 - 0xFB00) : (v))
  53
  54 // Fallback mappings for CJK Compatibility Ideographs Standardized Variants
  55 // taken from %s.
  56 // Using OpenType format 14 cmap subtable structure to reuse the lookup code
  57 // for fonts. The glyphID field is used to store the corresponding codepoints
  58 // CJK Compatibility Ideographs. To fit codepoints into the 16-bit glyphID
  59 // field, CJK Compatibility Ideographs Supplement (U+2F800..U+2FA1F) will be
  60 // mapped to 0xFB00..0xFD1F.
  61 extern const uint8_t sCJKCompatSVSTable[] = {
  62 """
  63     % (os.path.basename(sys.argv[0]), fileversion)
  64 )
  65 f.write("  U16(14), // format\n")
  66 f.write("  U32(%d), // length\n" % length)
  67 f.write("  U32(%d), // numVarSelectorRecords\n" % len(vsdict))
  68 for i, k in enumerate(sorted(vsdict.keys())):
  69     f.write(
  70         "    U24(0x%04X), U32(0), U32(%d), // varSelectorRecord[%d]\n"
  71         % (k, offsets[i], i)
  72     )
  73 for (k, mappings) in sorted(vsdict.items()):
  74     f.write("  // 0x%04X\n" % k)
  75     f.write("  U32(%d), // numUVSMappings\n" % len(mappings))
  76     for (unified, compat) in sorted(mappings.items()):
  77         f.write("    U24(0x%04X), GLYPH(0x%04X),\n" % (unified, compat))
  78 f.write(
  79     """};
  80
  81 #undef U16
  82 #undef U24
  83 #undef U32
  84 #undef GLYPH
  85
  86 static_assert(sizeof sCJKCompatSVSTable == %d, "Table generator has a bug.");
  87 """
  88     % length
  89 )