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199 lines
8.0 KiB
Python
199 lines
8.0 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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#
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# Generate a translit_fraction file from a UnicodeData file.
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# Copyright (C) 2015-2023 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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'''
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Generate a translit_fraction file from UnicodeData.txt
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To see how this script is used, call it with the “-h” option:
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$ ./gen_translit_fraction -h
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… prints usage message …
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'''
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import argparse
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import time
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import unicode_utils
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def read_input_file(filename):
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'''Reads the original glibc translit_fraction file to get the
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original head and tail.
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We want to replace only the part of the file between
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“translit_start” and “translit_end”
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'''
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head = tail = ''
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with open(filename, mode='r') as translit_file:
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for line in translit_file:
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head = head + line
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if line.startswith('translit_start'):
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break
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for line in translit_file:
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if line.startswith('translit_end'):
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tail = line
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break
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for line in translit_file:
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tail = tail + line
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return (head, tail)
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def output_head(translit_file, unicode_version, head=''):
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'''Write the header of the output file, i.e. the part of the file
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before the “translit_start” line.
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'''
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if ARGS.input_file and head:
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translit_file.write(head)
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else:
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translit_file.write('escape_char /\n')
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translit_file.write('comment_char %\n')
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translit_file.write(unicode_utils.COMMENT_HEADER)
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translit_file.write('\n')
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translit_file.write('% Transliterations of fractions.\n')
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translit_file.write('% Generated automatically from UnicodeData.txt '
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+ 'by gen_translit_fraction.py '
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+ 'on {:s} '.format(time.strftime('%Y-%m-%d'))
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+ 'for Unicode {:s}.\n'.format(unicode_version))
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translit_file.write('% The replacements have been surrounded ')
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translit_file.write('with spaces, because fractions are\n')
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translit_file.write('% often preceded by a decimal number and ')
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translit_file.write('followed by a unit or a math symbol.\n')
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translit_file.write('\n')
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translit_file.write('LC_CTYPE\n')
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translit_file.write('\n')
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translit_file.write('translit_start\n')
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def output_tail(translit_file, tail=''):
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'''Write the tail of the output file'''
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if ARGS.input_file and tail:
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translit_file.write(tail)
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else:
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translit_file.write('translit_end\n')
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translit_file.write('\n')
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translit_file.write('END LC_CTYPE\n')
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def special_decompose(code_point_list):
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'''
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Decompositions which are not in UnicodeData.txt at all but which
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were used in the original translit_fraction file in glibc and
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which seem to make sense. I want to keep the update of
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translit_fraction close to the spirit of the original file,
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therefore I added this special decomposition rules here.
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'''
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special_decompose_dict = {
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(0x2044,): [0x002F], # ⁄ → /
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}
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if tuple(code_point_list) in special_decompose_dict:
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return special_decompose_dict[tuple(code_point_list)]
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else:
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return code_point_list
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def output_transliteration(translit_file):
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'''Write the new transliteration to the output file'''
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translit_file.write('\n')
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for code_point in sorted(unicode_utils.UNICODE_ATTRIBUTES):
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name = unicode_utils.UNICODE_ATTRIBUTES[code_point]['name']
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decomposition = unicode_utils.UNICODE_ATTRIBUTES[
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code_point]['decomposition']
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if decomposition.startswith('<fraction>'):
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decomposition = decomposition[11:]
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decomposed_code_points = [[int(x, 16)
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for x in decomposition.split(' ')]]
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if decomposed_code_points[0]:
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decomposed_code_points[0] = [0x0020] \
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+ decomposed_code_points[0] \
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+ [0x0020]
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while True:
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special_decomposed_code_points = special_decompose(
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decomposed_code_points[-1])
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if (special_decomposed_code_points
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!= decomposed_code_points[-1]):
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decomposed_code_points.append(
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special_decomposed_code_points)
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continue
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special_decomposed_code_points = []
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for decomposed_code_point in decomposed_code_points[-1]:
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special_decomposed_code_points += special_decompose(
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[decomposed_code_point])
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if (special_decomposed_code_points
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== decomposed_code_points[-1]):
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break
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decomposed_code_points.append(
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special_decomposed_code_points)
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translit_file.write('% {:s}\n'.format(name))
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translit_file.write('{:s} '.format(
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unicode_utils.ucs_symbol(code_point)))
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for index in range(0, len(decomposed_code_points)):
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if index > 0:
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translit_file.write(';')
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if len(decomposed_code_points[index]) > 1:
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translit_file.write('"')
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for decomposed_code_point in decomposed_code_points[index]:
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translit_file.write('{:s}'.format(
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unicode_utils.ucs_symbol(decomposed_code_point)))
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if len(decomposed_code_points[index]) > 1:
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translit_file.write('"')
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translit_file.write('\n')
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translit_file.write('\n')
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if __name__ == "__main__":
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PARSER = argparse.ArgumentParser(
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description='''
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Generate a translit_cjk_compat file from UnicodeData.txt.
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''')
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PARSER.add_argument(
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'-u', '--unicode_data_file',
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nargs='?',
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type=str,
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default='UnicodeData.txt',
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help=('The UnicodeData.txt file to read, '
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+ 'default: %(default)s'))
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PARSER.add_argument(
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'-i', '--input_file',
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nargs='?',
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type=str,
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help=''' The original glibc/localedata/locales/translit_fraction
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file.''')
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PARSER.add_argument(
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'-o', '--output_file',
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nargs='?',
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type=str,
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default='translit_fraction.new',
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help='''The new translit_fraction file, default: %(default)s. If the
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original glibc/localedata/locales/translit_fraction file has
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been given as an option, the header up to the
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“translit_start” line and the tail from the “translit_end”
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line to the end of the file will be copied unchanged into the
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output file. ''')
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PARSER.add_argument(
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'--unicode_version',
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nargs='?',
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required=True,
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type=str,
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help='The Unicode version of the input files used.')
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ARGS = PARSER.parse_args()
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unicode_utils.fill_attributes(ARGS.unicode_data_file)
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HEAD = TAIL = ''
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if ARGS.input_file:
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(HEAD, TAIL) = read_input_file(ARGS.input_file)
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with open(ARGS.output_file, mode='w') as TRANSLIT_FILE:
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output_head(TRANSLIT_FILE, ARGS.unicode_version, head=HEAD)
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output_transliteration(TRANSLIT_FILE)
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output_tail(TRANSLIT_FILE, tail=TAIL)
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