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glibc/localedata/unicode-gen/utf8_gen.py

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#!/usr/bin/python3
# -*- coding: utf-8 -*-
# Copyright (C) 2014-2016 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/>.
'''glibc/localedata/charmaps/UTF-8 file generator script
This script generates a glibc/localedata/charmaps/UTF-8 file
from Unicode data.
Usage: python3 utf8_gen.py UnicodeData.txt EastAsianWidth.txt
It will output UTF-8 file
'''
import sys
import re
import unicode_utils
# Auxiliary tables for Hangul syllable names, see the Unicode 3.0 book,
# sections 3.11 and 4.4.
JAMO_INITIAL_SHORT_NAME = (
'G', 'GG', 'N', 'D', 'DD', 'R', 'M', 'B', 'BB', 'S', 'SS', '', 'J', 'JJ',
'C', 'K', 'T', 'P', 'H'
)
JAMO_MEDIAL_SHORT_NAME = (
'A', 'AE', 'YA', 'YAE', 'EO', 'E', 'YEO', 'YE', 'O', 'WA', 'WAE', 'OE',
'YO', 'U', 'WEO', 'WE', 'WI', 'YU', 'EU', 'YI', 'I'
)
JAMO_FINAL_SHORT_NAME = (
'', 'G', 'GG', 'GS', 'N', 'NI', 'NH', 'D', 'L', 'LG', 'LM', 'LB', 'LS',
'LT', 'LP', 'LH', 'M', 'B', 'BS', 'S', 'SS', 'NG', 'J', 'C', 'K', 'T',
'P', 'H'
)
def process_range(start, end, outfile, name):
'''Writes a range of code points into the CHARMAP section of the
output file
'''
if 'Hangul Syllable' in name:
# from glibc/localedata/ChangeLog:
#
# 2000-09-24 Bruno Haible <haible@clisp.cons.org>
# * charmaps/UTF-8: Expand <Hangul Syllable> and <Private Use> ranges,
# so they become printable and carry a width. Comment out surrogate
# ranges. Add a WIDTH table
#
# So we expand the Hangul Syllables here:
for i in range(int(start, 16), int(end, 16)+1 ):
index2, index3 = divmod(i - 0xaC00, 28)
index1, index2 = divmod(index2, 21)
hangul_syllable_name = 'HANGUL SYLLABLE ' \
+ JAMO_INITIAL_SHORT_NAME[index1] \
+ JAMO_MEDIAL_SHORT_NAME[index2] \
+ JAMO_FINAL_SHORT_NAME[index3]
outfile.write('{:<11s} {:<12s} {:s}\n'.format(
unicode_utils.ucs_symbol(i), convert_to_hex(i),
hangul_syllable_name))
return
# UnicodeData.txt file has contains code point ranges like this:
#
# 3400;<CJK Ideograph Extension A, First>;Lo;0;L;;;;;N;;;;;
# 4DB5;<CJK Ideograph Extension A, Last>;Lo;0;L;;;;;N;;;;;
#
# The glibc UTF-8 file splits ranges like these into shorter
# ranges of 64 code points each:
#
# <U3400>..<U343F> /xe3/x90/x80 <CJK Ideograph Extension A>
# …
# <U4D80>..<U4DB5> /xe4/xb6/x80 <CJK Ideograph Extension A>
for i in range(int(start, 16), int(end, 16), 64 ):
if i > (int(end, 16)-64):
outfile.write('{:s}..{:s} {:<12s} {:s}\n'.format(
unicode_utils.ucs_symbol(i),
unicode_utils.ucs_symbol(int(end,16)),
convert_to_hex(i),
name))
break
outfile.write('{:s}..{:s} {:<12s} {:s}\n'.format(
unicode_utils.ucs_symbol(i),
unicode_utils.ucs_symbol(i+63),
convert_to_hex(i),
name))
def process_charmap(flines, outfile):
'''This function takes an array which contains *all* lines of
of UnicodeData.txt and write lines to outfile as used in the
CHARMAP
…
END CHARMAP
section of the UTF-8 file in glibc/localedata/charmaps/UTF-8.
Samples for input lines:
0010;<control>;Cc;0;BN;;;;;N;DATA LINK ESCAPE;;;;
3400;<CJK Ideograph Extension A, First>;Lo;0;L;;;;;N;;;;;
4DB5;<CJK Ideograph Extension A, Last>;Lo;0;L;;;;;N;;;;;
D800;<Non Private Use High Surrogate, First>;Cs;0;L;;;;;N;;;;;
DB7F;<Non Private Use High Surrogate, Last>;Cs;0;L;;;;;N;;;;;
100000;<Plane 16 Private Use, First>;Co;0;L;;;;;N;;;;;
10FFFD;<Plane 16 Private Use, Last>;Co;0;L;;;;;N;;;;;
Samples for output lines (Unicode-Value UTF-8-HEX Unicode-Char-Name):
<U0010> /x10 DATA LINK ESCAPE
<U3400>..<U343F> /xe3/x90/x80 <CJK Ideograph Extension A>
%<UD800> /xed/xa0/x80 <Non Private Use High Surrogate, First>
%<UDB7F> /xed/xad/xbf <Non Private Use High Surrogate, Last>
<U0010FFC0>..<U0010FFFD> /xf4/x8f/xbf/x80 <Plane 16 Private Use>
'''
fields_start = []
for line in flines:
fields = line.split(";")
# Some characters have “<control>” as their name. We try to
# use the “Unicode 1.0 Name” (10th field in
# UnicodeData.txt) for them.
#
# The Characters U+0080, U+0081, U+0084 and U+0099 have
# “<control>” as their name but do not even have aa
# ”Unicode 1.0 Name”. We could write code to take their
# alternate names from NameAliases.txt.
if fields[1] == "<control>" and fields[10]:
fields[1] = fields[10]
# Handling code point ranges like:
#
# 3400;<CJK Ideograph Extension A, First>;Lo;0;L;;;;;N;;;;;
# 4DB5;<CJK Ideograph Extension A, Last>;Lo;0;L;;;;;N;;;;;
if fields[1].endswith(', First>') and not 'Surrogate,' in fields[1]:
fields_start = fields
continue
if fields[1].endswith(', Last>') and not 'Surrogate,' in fields[1]:
process_range(fields_start[0], fields[0],
outfile, fields[1][:-7]+'>')
fields_start = []
continue
fields_start = []
if 'Surrogate,' in fields[1]:
# Comment out the surrogates in the UTF-8 file.
# One could of course skip them completely but
# the original UTF-8 file in glibc had them as
# comments, so we keep these comment lines.
outfile.write('%')
outfile.write('{:<11s} {:<12s} {:s}\n'.format(
unicode_utils.ucs_symbol(int(fields[0], 16)),
convert_to_hex(int(fields[0], 16)),
fields[1]))
def convert_to_hex(code_point):
'''Converts a code point to a hexadecimal UTF-8 representation
like /x**/x**/x**.'''
# Getting UTF8 of Unicode characters.
# In Python3, .encode('UTF-8') does not work for
# surrogates. Therefore, we use this conversion table
surrogates = {
0xD800: '/xed/xa0/x80',
0xDB7F: '/xed/xad/xbf',
0xDB80: '/xed/xae/x80',
0xDBFF: '/xed/xaf/xbf',
0xDC00: '/xed/xb0/x80',
0xDFFF: '/xed/xbf/xbf',
}
if code_point in surrogates:
return surrogates[code_point]
return ''.join([
'/x{:02x}'.format(c) for c in chr(code_point).encode('UTF-8')
])
def write_header_charmap(outfile):
'''Write the header on top of the CHARMAP section to the output file'''
outfile.write("<code_set_name> UTF-8\n")
outfile.write("<comment_char> %\n")
outfile.write("<escape_char> /\n")
outfile.write("<mb_cur_min> 1\n")
outfile.write("<mb_cur_max> 6\n\n")
outfile.write("% CHARMAP generated using utf8_gen.py\n")
outfile.write("% alias ISO-10646/UTF-8\n")
outfile.write("CHARMAP\n")
def write_header_width(outfile):
'''Writes the header on top of the WIDTH section to the output file'''
outfile.write('% Character width according to Unicode 7.0.0.\n')
outfile.write('% - Default width is 1.\n')
outfile.write('% - Double-width characters have width 2; generated from\n')
outfile.write('% "grep \'^[^;]*;[WF]\' EastAsianWidth.txt"\n')
outfile.write('% - Non-spacing characters have width 0; '
+ 'generated from PropList.txt or\n')
outfile.write('% "grep \'^[^;]*;[^;]*;[^;]*;[^;]*;NSM;\' '
+ 'UnicodeData.txt"\n')
outfile.write('% - Format control characters have width 0; '
+ 'generated from\n')
outfile.write("% \"grep '^[^;]*;[^;]*;Cf;' UnicodeData.txt\"\n")
# Not needed covered by Cf
# outfile.write("% - Zero width characters have width 0; generated from\n")
# outfile.write("% \"grep '^[^;]*;ZERO WIDTH ' UnicodeData.txt\"\n")
outfile.write("WIDTH\n")
def process_width(outfile, ulines, elines):
'''ulines are lines from UnicodeData.txt, elines are lines from
EastAsianWidth.txt
'''
width_dict = {}
for line in ulines:
fields = line.split(";")
if fields[4] == "NSM" or fields[2] == "Cf":
width_dict[int(fields[0], 16)] = unicode_utils.ucs_symbol(
int(fields[0], 16)) + '\t0'
for line in elines:
# If an entry in EastAsianWidth.txt is found, it overrides entries in
# UnicodeData.txt:
fields = line.split(";")
if not '..' in fields[0]:
width_dict[int(fields[0], 16)] = unicode_utils.ucs_symbol(
int(fields[0], 16)) + '\t2'
else:
code_points = fields[0].split("..")
for key in range(int(code_points[0], 16),
int(code_points[1], 16)+1):
if key in width_dict:
del width_dict[key]
width_dict[int(code_points[0], 16)] = '{:s}...{:s}\t2'.format(
unicode_utils.ucs_symbol(int(code_points[0], 16)),
unicode_utils.ucs_symbol(int(code_points[1], 16)))
for key in sorted(width_dict):
outfile.write(width_dict[key]+'\n')
if __name__ == "__main__":
if len(sys.argv) < 3:
print("USAGE: python3 utf8_gen.py UnicodeData.txt EastAsianWidth.txt")
else:
with open(sys.argv[1], mode='r') as UNIDATA_FILE:
UNICODE_DATA_LINES = UNIDATA_FILE.readlines()
with open(sys.argv[2], mode='r') as EAST_ASIAN_WIDTH_FILE:
EAST_ASIAN_WIDTH_LINES = []
for LINE in EAST_ASIAN_WIDTH_FILE:
# If characters from EastAasianWidth.txt which are from
# from reserved ranges (i.e. not yet assigned code points)
# are added to the WIDTH section of the UTF-8 file, then
# “make check” produces “Unknown Character” errors for
# these code points because such unassigned code points
# are not in the CHARMAP section of the UTF-8 file.
#
# Therefore, we skip all reserved code points when reading
# the EastAsianWidth.txt file.
if re.match(r'.*<reserved-.+>\.\.<reserved-.+>.*', LINE):
continue
if re.match(r'^[^;]*;[WF]', LINE):
EAST_ASIAN_WIDTH_LINES.append(LINE.strip())
with open('UTF-8', mode='w') as OUTFILE:
# Processing UnicodeData.txt and write CHARMAP to UTF-8 file
write_header_charmap(OUTFILE)
process_charmap(UNICODE_DATA_LINES, OUTFILE)
OUTFILE.write("END CHARMAP\n\n")
# Processing EastAsianWidth.txt and write WIDTH to UTF-8 file
write_header_width(OUTFILE)
process_width(OUTFILE, UNICODE_DATA_LINES, EAST_ASIAN_WIDTH_LINES)
OUTFILE.write("END WIDTH\n")
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