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cpython/Tools/unicode/genmap_tchinese.py

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#
# genmap_tchinese.py: Traditional Chinese Codecs Map Generator
#
# Original Author: Hye-Shik Chang <perky@FreeBSD.org>
#
import os
from genmap_support import *
# ranges for (lead byte, follower byte)
BIG5_C1 = (0xa1, 0xfe)
BIG5_C2 = (0x40, 0xfe)
BIG5HKSCS_C1 = (0x87, 0xfe)
BIG5HKSCS_C2 = (0x40, 0xfe)
MAPPINGS_BIG5 = 'https://unicode.org/Public/MAPPINGS/OBSOLETE/EASTASIA/OTHER/BIG5.TXT'
MAPPINGS_CP950 = 'https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP950.TXT'
HKSCS_VERSION = '2004'
# The files for HKSCS mappings are available under a restrictive license.
# Users of the script need to download the files from the HKSARG CCLI website:
MAPPINGS_HKSCS = f'https://www.ccli.gov.hk/en/archive/terms_hkscs-{HKSCS_VERSION}-big5-iso.html'
def bh2s(code):
return ((code >> 8) - 0x87) * (0xfe - 0x40 + 1) + ((code & 0xff) - 0x40)
def split_bytes(code):
"""Split 0xABCD into 0xAB, 0xCD"""
return code >> 8, code & 0xff
def parse_hkscs_map(fo):
fo.seek(0, 0)
table = []
for line in fo:
line = line.split('#', 1)[0].strip()
# We expect 4 columns in supported HKSCS files:
# [1999]: unsupported
# [2001]: unsupported
# [2004]: Big-5; iso10646-1:1993; iso10646-1:2000; iso10646:2003+amd1
# [2008]: Big-5; iso10646-1:1993; iso10646-1:2000; iso10646:2003+amd6
# [2016]: not supported here--uses a json file instead
#
# In both supported cases, we only need the first and last column:
# * Big-5 is a hex string (always 4 digits)
# * iso10646:2003 is either a hex string (4 or 5 digits) or a sequence
# of hex strings like: `<code_point1,code_point2>`
try:
hkscs_col, _, _, uni_col = line.split()
hkscs = int(hkscs_col, 16)
seq = tuple(int(cp, 16) for cp in uni_col.strip('<>').split(','))
except ValueError:
continue
table.append((hkscs, seq))
return table
def make_hkscs_map(table):
decode_map = {}
encode_map_bmp, encode_map_notbmp = {}, {}
is_bmp_map = {}
sequences = []
beginnings = {}
single_cp_table = []
# Determine multi-codepoint sequences, and sequence beginnings that encode
# multiple multibyte (i.e. Big-5) codes.
for mbcode, cp_seq in table:
cp, *_ = cp_seq
if len(cp_seq) == 1:
single_cp_table.append((mbcode, cp))
else:
sequences.append((mbcode, cp_seq))
beginnings.setdefault(cp, []).append(mbcode)
# Decode table only cares about single code points (no sequences) currently
for mbcode, cp in single_cp_table:
b1, b2 = split_bytes(mbcode)
decode_map.setdefault(b1, {})
decode_map[b1][b2] = cp & 0xffff
# Encode table needs to mark code points beginning a sequence as tuples.
for cp, mbcodes in beginnings.items():
plane = cp >> 16
if plane == 0:
encode_map = encode_map_bmp
elif plane == 2:
encode_map = encode_map_notbmp
is_bmp_map[bh2s(mbcodes[0])] = 1
else:
assert False, 'only plane 0 (BMP) and plane 2 (SIP) allowed'
if len(mbcodes) == 1:
encode_value = mbcodes[0]
else:
encode_value = tuple(mbcodes)
uni_b1, uni_b2 = split_bytes(cp & 0xffff)
encode_map.setdefault(uni_b1, {})
encode_map[uni_b1][uni_b2] = encode_value
return decode_map, encode_map_bmp, encode_map_notbmp, is_bmp_map
def load_big5_map():
mapfile = open_mapping_file('python-mappings/BIG5.txt', MAPPINGS_BIG5)
with mapfile:
big5decmap = loadmap(mapfile)
# big5 mapping fix: use the cp950 mapping for these characters as the file
# provided by unicode.org doesn't define a mapping. See notes in BIG5.txt.
# Since U+5341, U+5345, U+FF0F, U+FF3C already have a big5 mapping, no
# roundtrip compatibility is guaranteed for those.
for m in """\
0xA15A 0x2574
0xA1C3 0xFFE3
0xA1C5 0x02CD
0xA1FE 0xFF0F
0xA240 0xFF3C
0xA2CC 0x5341
0xA2CE 0x5345""".splitlines():
bcode, ucode = list(map(eval, m.split()))
big5decmap[bcode >> 8][bcode & 0xff] = ucode
# encoding map
big5encmap = {}
for c1, m in list(big5decmap.items()):
for c2, code in list(m.items()):
big5encmap.setdefault(code >> 8, {})
if code & 0xff not in big5encmap[code >> 8]:
big5encmap[code >> 8][code & 0xff] = c1 << 8 | c2
# fix unicode->big5 priority for the above-mentioned duplicate characters
big5encmap[0xFF][0x0F] = 0xA241
big5encmap[0xFF][0x3C] = 0xA242
big5encmap[0x53][0x41] = 0xA451
big5encmap[0x53][0x45] = 0xA4CA
return big5decmap, big5encmap
def load_cp950_map():
mapfile = open_mapping_file('python-mappings/CP950.TXT', MAPPINGS_CP950)
with mapfile:
cp950decmap = loadmap(mapfile)
cp950encmap = {}
for c1, m in list(cp950decmap.items()):
for c2, code in list(m.items()):
cp950encmap.setdefault(code >> 8, {})
if code & 0xff not in cp950encmap[code >> 8]:
cp950encmap[code >> 8][code & 0xff] = c1 << 8 | c2
# fix unicode->big5 duplicated mapping priority
cp950encmap[0x53][0x41] = 0xA451
cp950encmap[0x53][0x45] = 0xA4CA
return cp950decmap, cp950encmap
def main_tw():
big5decmap, big5encmap = load_big5_map()
cp950decmap, cp950encmap = load_cp950_map()
# CP950 extends Big5, and the codec can use the Big5 lookup tables
# for most entries. So the CP950 tables should only include entries
# that are not in Big5:
for c1, m in list(cp950encmap.items()):
for c2, code in list(m.items()):
if (c1 in big5encmap and c2 in big5encmap[c1]
and big5encmap[c1][c2] == code):
del cp950encmap[c1][c2]
for c1, m in list(cp950decmap.items()):
for c2, code in list(m.items()):
if (c1 in big5decmap and c2 in big5decmap[c1]
and big5decmap[c1][c2] == code):
del cp950decmap[c1][c2]
with open('mappings_tw.h', 'w') as fp:
print_autogen(fp, os.path.basename(__file__))
write_big5_maps(fp, 'BIG5', 'big5', big5decmap, big5encmap)
write_big5_maps(fp, 'CP950', 'cp950ext', cp950decmap, cp950encmap)
def write_big5_maps(fp, display_name, table_name, decode_map, encode_map):
print(f'Generating {display_name} decode map...')
writer = DecodeMapWriter(fp, table_name, decode_map)
writer.update_decode_map(BIG5_C1, BIG5_C2)
writer.generate()
print(f'Generating {display_name} encode map...')
writer = EncodeMapWriter(fp, table_name, encode_map)
writer.generate()
class HintsWriter:
filler_class = BufferedFiller
def __init__(self, fp, prefix, isbmpmap):
self.fp = fp
self.prefix = prefix
self.isbmpmap = isbmpmap
self.filler = self.filler_class()
def fillhints(self, hintfrom, hintto):
name = f'{self.prefix}_phint_{hintfrom}'
self.fp.write(f'static const unsigned char {name}[] = {{\n')
for msbcode in range(hintfrom, hintto+1, 8):
v = 0
for c in range(msbcode, msbcode+8):
v |= self.isbmpmap.get(c, 0) << (c - msbcode)
self.filler.write('%d,' % v)
self.filler.printout(self.fp)
self.fp.write('};\n\n')
def main_hkscs():
filename = f'python-mappings/hkscs-{HKSCS_VERSION}-big5-iso.txt'
with open_mapping_file(filename, MAPPINGS_HKSCS) as f:
table = parse_hkscs_map(f)
hkscsdecmap, hkscsencmap_bmp, hkscsencmap_nonbmp, isbmpmap = (
make_hkscs_map(table)
)
with open('mappings_hk.h', 'w') as fp:
print('Generating BIG5HKSCS decode map...')
print_autogen(fp, os.path.basename(__file__))
writer = DecodeMapWriter(fp, 'big5hkscs', hkscsdecmap)
writer.update_decode_map(BIG5HKSCS_C1, BIG5HKSCS_C2)
writer.generate()
print('Generating BIG5HKSCS decode map Unicode plane hints...')
writer = HintsWriter(fp, 'big5hkscs', isbmpmap)
writer.fillhints(bh2s(0x8740), bh2s(0xa0fe))
writer.fillhints(bh2s(0xc6a1), bh2s(0xc8fe))
writer.fillhints(bh2s(0xf9d6), bh2s(0xfefe))
print('Generating BIG5HKSCS encode map (BMP)...')
writer = EncodeMapWriter(fp, 'big5hkscs_bmp', hkscsencmap_bmp)
writer.generate()
print('Generating BIG5HKSCS encode map (non-BMP)...')
writer = EncodeMapWriter(fp, 'big5hkscs_nonbmp', hkscsencmap_nonbmp)
writer.generate()
if __name__ == '__main__':
main_tw()
main_hkscs()
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