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Diffstat (limited to 'localedata/unicode-gen/gen_translit_compat.py')
| -rw-r--r-- | localedata/unicode-gen/gen_translit_compat.py | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/localedata/unicode-gen/gen_translit_compat.py b/localedata/unicode-gen/gen_translit_compat.py new file mode 100644 index 0000000000..0e824a877e --- /dev/null +++ b/localedata/unicode-gen/gen_translit_compat.py @@ -0,0 +1,326 @@ +#!/usr/bin/python3 +# -*- coding: utf-8 -*- +# +# Generate a translit_compat file from a UnicodeData file. +# Copyright (C) 2015 Free Software Foundation, Inc. +# This file is part of the GNU C Library. +# +# The GNU C Library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# The GNU C Library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with the GNU C Library; if not, see +# <http://www.gnu.org/licenses/>. + +''' +Generate a translit_compat file from UnicodeData.txt + +To see how this script is used, call it with the “-h” option: + + $ ./gen_translit_compat -h + … prints usage message … +''' + +import argparse +import time +import unicode_utils + +def read_input_file(filename): + '''Reads the original glibc translit_compat file to get the + original head and tail. + + We want to replace only the part of the file between + “translit_start” and “translit_end” + ''' + head = tail = '' + with open(filename, mode='r') as translit_file: + for line in translit_file: + head = head + line + if line.startswith('translit_start'): + break + for line in translit_file: + if line.startswith('translit_end'): + tail = line + break + for line in translit_file: + tail = tail + line + return (head, tail) + +def output_head(translit_file, unicode_version, head=''): + '''Write the header of the output file, i.e. the part of the file + before the “translit_start” line. + ''' + if ARGS.input_file and head: + translit_file.write(head) + else: + translit_file.write('escape_char /\n') + translit_file.write('comment_char %\n') + translit_file.write('\n') + translit_file.write('% Transliterations of compatibility characters ') + translit_file.write('and ligatures.\n') + translit_file.write('% Generated automatically from UnicodeData.txt ' + + 'by gen_translit_compat.py ' + + 'on {:s} '.format(time.strftime('%Y-%m-%d')) + + 'for Unicode {:s}.\n'.format(unicode_version)) + translit_file.write('\n') + translit_file.write('LC_CTYPE\n') + translit_file.write('\n') + translit_file.write('translit_start\n') + +def output_tail(translit_file, tail=''): + '''Write the tail of the output file''' + if ARGS.input_file and tail: + translit_file.write(tail) + else: + translit_file.write('translit_end\n') + translit_file.write('\n') + translit_file.write('END LC_CTYPE\n') + +def compatibility_decompose(code_point): + '''http://www.unicode.org/reports/tr44/#Character_Decomposition_Mappings + + “The compatibility decomposition is formed by recursively applying + the canonical and compatibility mappings, then applying the + Canonical Ordering Algorithm.” + + We don’t do the canonical decomposition here because this is + done in gen_translit_combining.py to generate translit_combining. + + And we ignore some of the possible compatibility formatting tags + here. Some of them are used in other translit_* files, not + translit_compat: + + <font>: translit_font + <circle>: translit_circle + <wide>: translit_wide + <narrow>: translit_narrow + <square>: translit_cjk_compat + <fraction>: translit_fraction + + And we ignore + + <noBreak>, <initial>, <medial>, <final>, <isolated> + + because they seem to be not useful for transliteration. + ''' + decomposition = unicode_utils.UNICODE_ATTRIBUTES[ + code_point]['decomposition'] + compatibility_tags = ( + '<compat>', '<super>', '<sub>', '<vertical>') + for compatibility_tag in compatibility_tags: + if decomposition.startswith(compatibility_tag): + decomposition = decomposition[len(compatibility_tag)+1:] + decomposed_code_points = [int(x, 16) + for x in decomposition.split(' ')] + if (len(decomposed_code_points) > 1 + and decomposed_code_points[0] == 0x0020 + and decomposed_code_points[1] >= 0x0300 + and decomposed_code_points[1] <= 0x03FF): + # Decomposes into a space followed by a combining character. + # This is not useful fo transliteration. + return [] + else: + return_value = [] + for index in range(0, len(decomposed_code_points)): + cd_code_points = compatibility_decompose( + decomposed_code_points[index]) + if cd_code_points: + return_value += cd_code_points + else: + return_value += [decomposed_code_points[index]] + return return_value + return [] + +def special_decompose(code_point_list): + ''' + Decompositions which are not in UnicodeData.txt at all but which + were used in the original translit_compat file in glibc and + which seem to make sense. I want to keep the update of + translit_compat close to the spirit of the original file, + therefore I added this special decomposition rules here. + ''' + special_decompose_dict = { + (0x03BC,): [0x0075], # μ → u + (0x02BC,): [0x0027], # ʼ → ' + } + if tuple(code_point_list) in special_decompose_dict: + return special_decompose_dict[tuple(code_point_list)] + else: + return code_point_list + +def special_ligature_decompose(code_point): + ''' + Decompositions for ligatures which are not in UnicodeData.txt at + all but which were used in the original translit_compat file in + glibc and which seem to make sense. I want to keep the update of + translit_compat close to the spirit of the original file, + therefore I added these special ligature decomposition rules here. + + ''' + special_ligature_decompose_dict = { + 0x00E6: [0x0061, 0x0065], # æ → ae + 0x00C6: [0x0041, 0x0045], # Æ → AE + # These following 5 special ligature decompositions were + # in the original glibc/localedata/locales/translit_compat file + 0x0152: [0x004F, 0x0045], # Œ → OE + 0x0153: [0x006F, 0x0065], # œ → oe + 0x05F0: [0x05D5, 0x05D5], # װ → וו + 0x05F1: [0x05D5, 0x05D9], # ױ → וי + 0x05F2: [0x05D9, 0x05D9], # ײ → יי + # The following special ligature decompositions were + # not in the original glibc/localedata/locales/translit_compat file + # U+04A4 CYRILLIC CAPITAL LIGATURE EN GHE + # → U+041D CYRILLIC CAPITAL LETTER EN, + # U+0413 CYRILLIC CAPITAL LETTER GHE + 0x04A4: [0x041D, 0x0413], # Ҥ → НГ + # U+04A5 CYRILLIC SMALL LIGATURE EN GHE + # → U+043D CYRILLIC SMALL LETTER EN, + # U+0433 CYRILLIC SMALL LETTER GHE + 0x04A5: [0x043D, 0x0433], # ҥ → нг + # U+04B4 CYRILLIC CAPITAL LIGATURE TE TSE + # → U+0422 CYRILLIC CAPITAL LETTER TE, + # U+0426 CYRILLIC CAPITAL LETTER TSE + 0x04B4: [0x0422, 0x0426], # Ҵ → ТЦ + # U+04B5 CYRILLIC SMALL LIGATURE TE TSE + # → U+0442 CYRILLIC SMALL LETTER TE, + # U+0446 CYRILLIC SMALL LETTER TSE + 0x04B5: [0x0442, 0x0446], # ҵ → тц + # U+04d4 CYRILLIC CAPITAL LIGATURE A IE + # → U+0410 CYRILLIC CAPITAL LETTER A + # U+0415;CYRILLIC CAPITAL LETTER IE + 0x04D4: [0x0410, 0x0415], # Ӕ → АЕ + # U+04D5 CYRILLIC SMALL LIGATURE A IE + # → U+0430 CYRILLIC SMALL LETTER A, + # U+0435 CYRILLIC SMALL LETTER IE + 0x04D5: [0x0430, 0x0435], # ӕ → ае + # I am not sure what to do with the following ligatures + # maybe it makes no sense to decompose them: + # U+0616 ARABIC SMALL HIGH LIGATURE ALEF WITH LAM WITH YEH + # U+06d6 ARABIC SMALL HIGH LIGATURE SAD WITH LAM WITH ALEF MAKSURA + # U+06d7 ARABIC SMALL HIGH LIGATURE QAF WITH LAM WITH ALEF MAKSURA + # U+fdfd ARABIC LIGATURE BISMILLAH AR-RAHMAN AR-RAHEEM + # U+fe20 COMBINING LIGATURE LEFT HALF + # U+fe21 COMBINING LIGATURE RIGHT HALF + # U+fe27 COMBINING LIGATURE LEFT HALF BELOW + # U+fe28 COMBINING LIGATURE RIGHT HALF BELOW + # U+11176 MAHAJANI LIGATURE SHRI + # U+1f670 SCRIPT LIGATURE ET ORNAMENT + # U+1f671 HEAVY SCRIPT LIGATURE ET ORNAMENT + # U+1f672 LIGATURE OPEN ET ORNAMENT + # U+1f673 HEAVY LIGATURE OPEN ET ORNAMENT + } + if code_point in special_ligature_decompose_dict: + return special_ligature_decompose_dict[code_point] + else: + return [code_point] + +def output_transliteration(translit_file): + '''Write the new transliteration to the output file''' + translit_file.write('\n') + for code_point in sorted(unicode_utils.UNICODE_ATTRIBUTES): + name = unicode_utils.UNICODE_ATTRIBUTES[code_point]['name'] + decomposed_code_points = [compatibility_decompose(code_point)] + if not decomposed_code_points[0]: + if special_decompose([code_point]) != [code_point]: + decomposed_code_points[0] = special_decompose([code_point]) + else: + special_decomposed_code_points = [] + while True: + special_decomposed_code_points = special_decompose( + decomposed_code_points[-1]) + if (special_decomposed_code_points + != decomposed_code_points[-1]): + decomposed_code_points.append( + special_decomposed_code_points) + continue + special_decomposed_code_points = [] + for decomposed_code_point in decomposed_code_points[-1]: + special_decomposed_code_points += special_decompose( + [decomposed_code_point]) + if (special_decomposed_code_points + == decomposed_code_points[-1]): + break + decomposed_code_points.append( + special_decomposed_code_points) + if decomposed_code_points[0]: + translit_file.write('% {:s}\n'.format(name)) + translit_file.write('{:s} '.format( + unicode_utils.ucs_symbol(code_point))) + for index in range(0, len(decomposed_code_points)): + if index > 0: + translit_file.write(';') + translit_file.write('"') + for decomposed_code_point in decomposed_code_points[index]: + translit_file.write('{:s}'.format( + unicode_utils.ucs_symbol(decomposed_code_point))) + translit_file.write('"') + translit_file.write('\n') + elif 'LIGATURE' in name and 'ARABIC' not in name: + decomposed_code_points = special_ligature_decompose(code_point) + if decomposed_code_points[0] != code_point: + translit_file.write('% {:s}\n'.format(name)) + translit_file.write('{:s} '.format( + unicode_utils.ucs_symbol(code_point))) + translit_file.write('"') + for decomposed_code_point in decomposed_code_points: + translit_file.write('{:s}'.format( + unicode_utils.ucs_symbol(decomposed_code_point))) + translit_file.write('"') + translit_file.write('\n') + else: + print('Warning: unhandled ligature: {:x} {:s}'.format( + code_point, name)) + translit_file.write('\n') + +if __name__ == "__main__": + PARSER = argparse.ArgumentParser( + description=''' + Generate a translit_compat file from UnicodeData.txt. + ''') + PARSER.add_argument( + '-u', '--unicode_data_file', + nargs='?', + type=str, + default='UnicodeData.txt', + help=('The UnicodeData.txt file to read, ' + + 'default: %(default)s')) + PARSER.add_argument( + '-i', '--input_file', + nargs='?', + type=str, + help=''' The original glibc/localedata/locales/translit_compat + file.''') + PARSER.add_argument( + '-o', '--output_file', + nargs='?', + type=str, + default='translit_compat.new', + help='''The new translit_compat file, default: %(default)s. If the + original glibc/localedata/locales/translit_compat file has + been given as an option, the header up to the + “translit_start” line and the tail from the “translit_end” + line to the end of the file will be copied unchanged into the + output file. ''') + PARSER.add_argument( + '--unicode_version', + nargs='?', + required=True, + type=str, + help='The Unicode version of the input files used.') + ARGS = PARSER.parse_args() + + unicode_utils.fill_attributes(ARGS.unicode_data_file) + HEAD = TAIL = '' + if ARGS.input_file: + (HEAD, TAIL) = read_input_file(ARGS.input_file) + with open(ARGS.output_file, mode='w') as TRANSLIT_FILE: + output_head(TRANSLIT_FILE, ARGS.unicode_version, head=HEAD) + output_transliteration(TRANSLIT_FILE) + output_tail(TRANSLIT_FILE, tail=TAIL) |