localedata/unicode-gen/gen_translit_font.py

   1 #!/usr/bin/python3
   2 # -*- coding: utf-8 -*-
   3 #
   4 # Generate a translit_font file from a UnicodeData file.
   5 # Copyright (C) 2015-2021 Free Software Foundation, Inc.
   6 # This file is part of the GNU C Library.
   7 #
   8 # The GNU C Library is free software; you can redistribute it and/or
   9 # modify it under the terms of the GNU Lesser General Public
  10 # License as published by the Free Software Foundation; either
  11 # version 2.1 of the License, or (at your option) any later version.
  12 #
  13 # The GNU C Library is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 # Lesser General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU Lesser General Public
  19 # License along with the GNU C Library; if not, see
  20 # <https://www.gnu.org/licenses/>.
  21
  22 '''
  23 Generate a translit_font file from UnicodeData.txt
  24
  25 To see how this script is used, call it with the “-h” option:
  26
  27     $ ./gen_translit_font -h
  28     … prints usage message …
  29 '''
  30
  31 import argparse
  32 import time
  33 import unicode_utils
  34
  35 def read_input_file(filename):
  36     '''Reads the original glibc translit_font file to get the
  37     original head and tail.
  38
  39     We want to replace only the part of the file between
  40     “translit_start” and “translit_end”
  41     '''
  42     head = tail = ''
  43     with open(filename, mode='r') as translit_file:
  44         for line in translit_file:
  45             head = head + line
  46             if line.startswith('translit_start'):
  47                 break
  48         for line in translit_file:
  49             if line.startswith('translit_end'):
  50                 tail = line
  51                 break
  52         for line in translit_file:
  53             tail = tail + line
  54     return (head, tail)
  55
  56 def output_head(translit_file, unicode_version, head=''):
  57     '''Write the header of the output file, i.e. the part of the file
  58     before the “translit_start” line.
  59     '''
  60     if ARGS.input_file and head:
  61         translit_file.write(head)
  62     else:
  63         translit_file.write('escape_char /\n')
  64         translit_file.write('comment_char %\n')
  65         translit_file.write(unicode_utils.COMMENT_HEADER)
  66         translit_file.write('\n')
  67         translit_file.write('% Transliterations of font equivalents.\n')
  68         translit_file.write('% Generated automatically from UnicodeData.txt '
  69                             + 'by gen_translit_font.py '
  70                             + 'on {:s} '.format(time.strftime('%Y-%m-%d'))
  71                             + 'for Unicode {:s}.\n'.format(unicode_version))
  72         translit_file.write('\n')
  73         translit_file.write('LC_CTYPE\n')
  74         translit_file.write('\n')
  75         translit_file.write('translit_start\n')
  76
  77 def output_tail(translit_file, tail=''):
  78     '''Write the tail of the output file'''
  79     if ARGS.input_file and tail:
  80         translit_file.write(tail)
  81     else:
  82         translit_file.write('translit_end\n')
  83         translit_file.write('\n')
  84         translit_file.write('END LC_CTYPE\n')
  85
  86 def output_transliteration(translit_file):
  87     '''Write the new transliteration to the output file'''
  88     translit_file.write('\n')
  89     for code_point in sorted(unicode_utils.UNICODE_ATTRIBUTES):
  90         name = unicode_utils.UNICODE_ATTRIBUTES[code_point]['name']
  91         decomposition = unicode_utils.UNICODE_ATTRIBUTES[
  92             code_point]['decomposition']
  93         if decomposition.startswith('<font>'):
  94             decomposition = decomposition[7:]
  95             decomposed_code_points = [[int(x, 16)
  96                                        for x in decomposition.split(' ')]]
  97             if decomposed_code_points[0]:
  98                 translit_file.write('{:s} '.format(
  99                     unicode_utils.ucs_symbol(code_point)))
 100                 for index in range(0, len(decomposed_code_points)):
 101                     if index > 0:
 102                         translit_file.write(';')
 103                     if len(decomposed_code_points[index]) > 1:
 104                         translit_file.write('"')
 105                     for decomposed_code_point in decomposed_code_points[index]:
 106                         translit_file.write('{:s}'.format(
 107                             unicode_utils.ucs_symbol(decomposed_code_point)))
 108                     if len(decomposed_code_points[index]) > 1:
 109                         translit_file.write('"')
 110                 translit_file.write(' % {:s}\n'.format(name))
 111     translit_file.write('\n')
 112
 113 if __name__ == "__main__":
 114     PARSER = argparse.ArgumentParser(
 115         description='''
 116         Generate a translit_font file from UnicodeData.txt.
 117         ''')
 118     PARSER.add_argument(
 119         '-u', '--unicode_data_file',
 120         nargs='?',
 121         type=str,
 122         default='UnicodeData.txt',
 123         help=('The UnicodeData.txt file to read, '
 124               + 'default: %(default)s'))
 125     PARSER.add_argument(
 126         '-i', '--input_file',
 127         nargs='?',
 128         type=str,
 129         help=''' The original glibc/localedata/locales/translit_font
 130         file.''')
 131     PARSER.add_argument(
 132         '-o', '--output_file',
 133         nargs='?',
 134         type=str,
 135         default='translit_font.new',
 136         help='''The new translit_font file, default: %(default)s.  If the
 137         original glibc/localedata/locales/translit_font file has
 138         been given as an option, the header up to the
 139         “translit_start” line and the tail from the “translit_end”
 140         line to the end of the file will be copied unchanged into the
 141         output file.  ''')
 142     PARSER.add_argument(
 143         '--unicode_version',
 144         nargs='?',
 145         required=True,
 146         type=str,
 147         help='The Unicode version of the input files used.')
 148     ARGS = PARSER.parse_args()
 149
 150     unicode_utils.fill_attributes(ARGS.unicode_data_file)
 151     HEAD = TAIL = ''
 152     if ARGS.input_file:
 153         (HEAD, TAIL) = read_input_file(ARGS.input_file)
 154     with open(ARGS.output_file, mode='w') as TRANSLIT_FILE:
 155         output_head(TRANSLIT_FILE, ARGS.unicode_version, head=HEAD)
 156         output_transliteration(TRANSLIT_FILE)
 157         output_tail(TRANSLIT_FILE, tail=TAIL)