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#!/usr/bin/python3
# -*- coding: utf-8 -*-
#
# Generate a translit_fraction file from a UnicodeData file.
# Copyright (C) 2015-2021 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
# <https://www.gnu.org/licenses/>.
'''
Generate a translit_fraction file from UnicodeData.txt
To see how this script is used, call it with the “-h” option:
$ ./gen_translit_fraction -h
… prints usage message …
'''
import argparse
import time
import unicode_utils
def read_input_file(filename):
'''Reads the original glibc translit_fraction 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(unicode_utils.COMMENT_HEADER)
translit_file.write('\n')
translit_file.write('% Transliterations of fractions.\n')
translit_file.write('% Generated automatically from UnicodeData.txt '
+ 'by gen_translit_fraction.py '
+ 'on {:s} '.format(time.strftime('%Y-%m-%d'))
+ 'for Unicode {:s}.\n'.format(unicode_version))
translit_file.write('% The replacements have been surrounded ')
translit_file.write('with spaces, because fractions are\n')
translit_file.write('% often preceded by a decimal number and ')
translit_file.write('followed by a unit or a math symbol.\n')
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 special_decompose(code_point_list):
'''
Decompositions which are not in UnicodeData.txt at all but which
were used in the original translit_fraction file in glibc and
which seem to make sense. I want to keep the update of
translit_fraction close to the spirit of the original file,
therefore I added this special decomposition rules here.
'''
special_decompose_dict = {
(0x2044,): [0x002F], # ⁄ → /
}
if tuple(code_point_list) in special_decompose_dict:
return special_decompose_dict[tuple(code_point_list)]
else:
return code_point_list
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']
decomposition = unicode_utils.UNICODE_ATTRIBUTES[
code_point]['decomposition']
if decomposition.startswith('<fraction>'):
decomposition = decomposition[11:]
decomposed_code_points = [[int(x, 16)
for x in decomposition.split(' ')]]
if decomposed_code_points[0]:
decomposed_code_points[0] = [0x0020] \
+ decomposed_code_points[0] \
+ [0x0020]
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)
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(';')
if len(decomposed_code_points[index]) > 1:
translit_file.write('"')
for decomposed_code_point in decomposed_code_points[index]:
translit_file.write('{:s}'.format(
unicode_utils.ucs_symbol(decomposed_code_point)))
if len(decomposed_code_points[index]) > 1:
translit_file.write('"')
translit_file.write('\n')
translit_file.write('\n')
if __name__ == "__main__":
PARSER = argparse.ArgumentParser(
description='''
Generate a translit_cjk_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_fraction
file.''')
PARSER.add_argument(
'-o', '--output_file',
nargs='?',
type=str,
default='translit_fraction.new',
help='''The new translit_fraction file, default: %(default)s. If the
original glibc/localedata/locales/translit_fraction 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)
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