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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from unicodedata import combining
UNICODE_LIMIT = 0x110000
UNICODE_COMBINING_CLASS_NOT_REORDERED = 0
UNICODE_COMBINING_CLASS_KANA_VOICING = 8
UNICODE_COMBINING_CLASS_VIRAMA = 9
# Keep this function in sync with IsCombiningDiacritic in nsUnicodeProperties.h.
def is_combining_diacritic(char):
return combining(char) not in (
UNICODE_COMBINING_CLASS_NOT_REORDERED,
UNICODE_COMBINING_CLASS_KANA_VOICING,
UNICODE_COMBINING_CLASS_VIRAMA,
91,
129,
130,
132,
)
# See gfxFontUtils.h for the SharedBitSet that we're creating a const instance of here.
BLOCK_SIZE = 32
BLOCK_SIZE_BITS = BLOCK_SIZE * 8
def main(header):
blockIndex = []
blocks = []
# Figure out the contents of each 256-char block, and see if it is unique
# or can share an already-allocated block.
block = [0] * BLOCK_SIZE
byte = 0
bit = 0x01
for char in range(UNICODE_LIMIT):
if is_combining_diacritic(chr(char)):
block[byte] |= bit
bit <<= 1
if bit == 0x100:
bit = 0x01
byte += 1
if byte == BLOCK_SIZE:
found = False
for b in range(len(blocks)):
if block == blocks[b]:
blockIndex.append(b)
found = True
break
if not found:
blockIndex.append(len(blocks))
blocks.append(block)
byte = 0
block = [0] * BLOCK_SIZE
# Strip trailing empty blocks from the index.
while blockIndex[len(blockIndex) - 1] == 0:
del blockIndex[len(blockIndex) - 1]
# Write the SharedBitSet as data in a C++ header file.
header.write("/* !GENERATED DATA -- DO NOT EDIT! */\n")
header.write("/* (see is_combining_diacritic.py) */\n")
header.write("\n")
header.write('#include "gfxFontUtils.h"\n')
header.write("\n")
header.write("typedef struct {\n")
header.write(" uint16_t mBlockIndexCount;\n")
header.write(" uint16_t mBlockCount;\n")
header.write(" uint16_t mBlockIndex[" + str(len(blockIndex)) + "];\n")
header.write(" uint8_t mBlockData[" + str(len(blocks) * BLOCK_SIZE) + "];\n")
header.write("} CombiningDiacriticsBitset_t;\n")
header.write("\n")
header.write(
"static const CombiningDiacriticsBitset_t COMBINING_DIACRITICS_BITSET_DATA = {\n"
)
header.write(" " + str(len(blockIndex)) + ",\n")
header.write(" " + str(len(blocks)) + ",\n")
header.write(" {\n")
for b in blockIndex:
header.write(" " + str(b) + ",\n")
header.write(" },\n")
header.write(" {\n")
for b in blocks:
header.write(" ")
for i in b:
header.write(str(i) + ",")
header.write("\n")
header.write(" },\n")
header.write("};\n")
header.write("\n")
header.write("static const SharedBitSet* sCombiningDiacriticsSet =\n")
header.write(
" reinterpret_cast<const SharedBitSet*>(&COMBINING_DIACRITICS_BITSET_DATA);\n"
)
header.write("\n")
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