| # |
| # 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() |
