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