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glibc/localedata/unicode-gen/unicode_utils.py

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This file contains ambiguous Unicode characters

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# Utilities to generate Unicode data for glibc from upstream Unicode data.
#
# Copyright (C) 2014-2024 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/>.
'''
This module contains utilities used by the scripts to generate
Unicode data for glibc from upstream Unicode data files.
'''
import sys
import re
# Common locale header.
COMMENT_HEADER = """
% This file is part of the GNU C Library and contains locale data.
% The Free Software Foundation does not claim any copyright interest
% in the locale data contained in this file. The foregoing does not
% affect the license of the GNU C Library as a whole. It does not
% exempt you from the conditions of the license if your use would
% otherwise be governed by that license.
"""
# Dictionary holding the entire contents of the UnicodeData.txt file
#
# Contents of this dictionary look like this:
#
# {0: {'category': 'Cc',
# 'title': None,
# 'digit': '',
# 'name': '<control>',
# 'bidi': 'BN',
# 'combining': '0',
# 'comment': '',
# 'oldname': 'NULL',
# 'decomposition': '',
# 'upper': None,
# 'mirrored': 'N',
# 'lower': None,
# 'decdigit': '',
# 'numeric': ''},
# …
# }
UNICODE_ATTRIBUTES = {}
# Dictionary holding the entire contents of the DerivedCoreProperties.txt file
#
# Contents of this dictionary look like this:
#
# {917504: ['Default_Ignorable_Code_Point'],
# 917505: ['Case_Ignorable', 'Default_Ignorable_Code_Point'],
# …
# }
DERIVED_CORE_PROPERTIES = {}
# Dictionary holding the entire contents of the EastAsianWidths.txt file
#
# Contents of this dictionary look like this:
#
# {0: 'N', … , 45430: 'W', …}
EAST_ASIAN_WIDTHS = {}
def fill_attribute(code_point, fields):
'''Stores in UNICODE_ATTRIBUTES[code_point] the values from the fields.
One entry in the UNICODE_ATTRIBUTES dictionary represents one line
in the UnicodeData.txt file.
'''
UNICODE_ATTRIBUTES[code_point] = {
'name': fields[1], # Character name
'category': fields[2], # General category
'combining': fields[3], # Canonical combining classes
'bidi': fields[4], # Bidirectional category
'decomposition': fields[5], # Character decomposition mapping
'decdigit': fields[6], # Decimal digit value
'digit': fields[7], # Digit value
'numeric': fields[8], # Numeric value
'mirrored': fields[9], # mirrored
'oldname': fields[10], # Old Unicode 1.0 name
'comment': fields[11], # comment
# Uppercase mapping
'upper': int(fields[12], 16) if fields[12] else None,
# Lowercase mapping
'lower': int(fields[13], 16) if fields[13] else None,
# Titlecase mapping
'title': int(fields[14], 16) if fields[14] else None,
}
def fill_attributes(filename):
'''Stores the entire contents of the UnicodeData.txt file
in the UNICODE_ATTRIBUTES dictionary.
A typical line for a single code point in UnicodeData.txt looks
like this:
0041;LATIN CAPITAL LETTER A;Lu;0;L;;;;;N;;;;0061;
Code point ranges are indicated by pairs of lines like this:
4E00;<CJK Ideograph, First>;Lo;0;L;;;;;N;;;;;
9FCC;<CJK Ideograph, Last>;Lo;0;L;;;;;N;;;;;
'''
with open(filename, mode='r') as unicode_data_file:
fields_start = []
for line in unicode_data_file:
fields = line.strip().split(';')
if len(fields) != 15:
sys.stderr.write(
'short line in file "%(f)s": %(l)s\n' %{
'f': filename, 'l': line})
exit(1)
if fields[2] == 'Cs':
# Surrogates are UTF-16 artefacts,
# not real characters. Ignore them.
fields_start = []
continue
if fields[1].endswith(', First>'):
fields_start = fields
fields_start[1] = fields_start[1].split(',')[0][1:]
continue
if fields[1].endswith(', Last>'):
fields[1] = fields[1].split(',')[0][1:]
if fields[1:] != fields_start[1:]:
sys.stderr.write(
'broken code point range in file "%(f)s": %(l)s\n' %{
'f': filename, 'l': line})
exit(1)
for code_point in range(
int(fields_start[0], 16),
int(fields[0], 16)+1):
fill_attribute(code_point, fields)
fields_start = []
continue
fill_attribute(int(fields[0], 16), fields)
fields_start = []
def fill_derived_core_properties(filename):
'''Stores the entire contents of the DerivedCoreProperties.txt file
in the DERIVED_CORE_PROPERTIES dictionary.
Lines in DerivedCoreProperties.txt are either a code point range like
this:
0061..007A ; Lowercase # L& [26] LATIN SMALL LETTER A..LATIN SMALL LETTER Z
or a single code point like this:
00AA ; Lowercase # Lo FEMININE ORDINAL INDICATOR
'''
with open(filename, mode='r') as derived_core_properties_file:
for line in derived_core_properties_file:
match = re.match(
r'^(?P<codepoint1>[0-9A-F]{4,6})'
+ r'(?:\.\.(?P<codepoint2>[0-9A-F]{4,6}))?'
+ r'\s*;\s*(?P<property>[a-zA-Z_]+)',
line)
if not match:
continue
start = match.group('codepoint1')
end = match.group('codepoint2')
if not end:
end = start
for code_point in range(int(start, 16), int(end, 16)+1):
prop = match.group('property')
if code_point in DERIVED_CORE_PROPERTIES:
DERIVED_CORE_PROPERTIES[code_point].append(prop)
else:
DERIVED_CORE_PROPERTIES[code_point] = [prop]
def fill_east_asian_widths(filename):
'''Stores the entire contents of the EastAsianWidths.txt file
in the EAST_ASIAN_WIDTHS dictionary.
Lines in EastAsianWidths.txt are either a code point range like
this:
9FCD..9FFF;W # Cn [51] <reserved-9FCD>..<reserved-9FFF>
or a single code point like this:
A015;W # Lm YI SYLLABLE WU
'''
with open(filename, mode='r') as east_asian_widths_file:
for line in east_asian_widths_file:
match = re.match(
r'^(?P<codepoint1>[0-9A-F]{4,6})'
+r'(?:\.\.(?P<codepoint2>[0-9A-F]{4,6}))?'
+r'\s*;\s*(?P<property>[a-zA-Z]+)',
line)
if not match:
continue
start = match.group('codepoint1')
end = match.group('codepoint2')
if not end:
end = start
for code_point in range(int(start, 16), int(end, 16)+1):
EAST_ASIAN_WIDTHS[code_point] = match.group('property')
def to_upper(code_point):
'''Returns the code point of the uppercase version
of the given code point'''
if (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['upper']):
return UNICODE_ATTRIBUTES[code_point]['upper']
else:
return code_point
def to_lower(code_point):
'''Returns the code point of the lowercase version
of the given code point'''
if (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['lower']):
return UNICODE_ATTRIBUTES[code_point]['lower']
else:
return code_point
def to_upper_turkish(code_point):
'''Returns the code point of the Turkish uppercase version
of the given code point'''
if code_point == 0x0069:
return 0x0130
return to_upper(code_point)
def to_lower_turkish(code_point):
'''Returns the code point of the Turkish lowercase version
of the given code point'''
if code_point == 0x0049:
return 0x0131
return to_lower(code_point)
def to_title(code_point):
'''Returns the code point of the titlecase version
of the given code point'''
if (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['title']):
return UNICODE_ATTRIBUTES[code_point]['title']
else:
return code_point
def is_upper(code_point):
'''Checks whether the character with this code point is uppercase'''
return (to_lower(code_point) != code_point
or (code_point in DERIVED_CORE_PROPERTIES
and 'Uppercase' in DERIVED_CORE_PROPERTIES[code_point]))
def is_lower(code_point):
'''Checks whether the character with this code point is lowercase'''
# Some characters are defined as “Lowercase” in
# DerivedCoreProperties.txt but do not have a mapping to upper
# case. For example, ꜰ U+A72F “LATIN LETTER SMALL CAPITAL F” is
# one of these.
return (to_upper(code_point) != code_point
# <U00DF> is lowercase, but without simple to_upper mapping.
or code_point == 0x00DF
or (code_point in DERIVED_CORE_PROPERTIES
and 'Lowercase' in DERIVED_CORE_PROPERTIES[code_point]))
def is_alpha(code_point):
'''Checks whether the character with this code point is alphabetic'''
return ((code_point in DERIVED_CORE_PROPERTIES
and
'Alphabetic' in DERIVED_CORE_PROPERTIES[code_point])
or
# Consider all the non-ASCII digits as alphabetic.
# ISO C 99 forbids us to have them in category “digit”,
# but we want iswalnum to return true on them.
(UNICODE_ATTRIBUTES[code_point]['category'] == 'Nd'
and not (code_point >= 0x0030 and code_point <= 0x0039)))
def is_digit(code_point):
'''Checks whether the character with this code point is a digit'''
if False:
return (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['category'] == 'Nd')
# Note: U+0BE7..U+0BEF and U+1369..U+1371 are digit systems without
# a zero. Must add <0> in front of them by hand.
else:
# SUSV2 gives us some freedom for the "digit" category, but ISO C 99
# takes it away:
# 7.25.2.1.5:
# The iswdigit function tests for any wide character that
# corresponds to a decimal-digit character (as defined in 5.2.1).
# 5.2.1:
# the 10 decimal digits 0 1 2 3 4 5 6 7 8 9
return (code_point >= 0x0030 and code_point <= 0x0039)
def is_outdigit(code_point):
'''Checks whether the character with this code point is outdigit'''
return (code_point >= 0x0030 and code_point <= 0x0039)
def is_blank(code_point):
'''Checks whether the character with this code point is blank'''
return (code_point == 0x0009 # '\t'
# Category Zs without mention of '<noBreak>'
or (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['category'] == 'Zs'
and '<noBreak>' not in
UNICODE_ATTRIBUTES[code_point]['decomposition']))
def is_space(code_point):
'''Checks whether the character with this code point is a space'''
# Don’t make U+00A0 a space. Non-breaking space means that all programs
# should treat it like a punctuation character, not like a space.
return (code_point == 0x0020 # ' '
or code_point == 0x000C # '\f'
or code_point == 0x000A # '\n'
or code_point == 0x000D # '\r'
or code_point == 0x0009 # '\t'
or code_point == 0x000B # '\v'
# Categories Zl, Zp, and Zs without mention of "<noBreak>"
or (UNICODE_ATTRIBUTES[code_point]['name']
and
(UNICODE_ATTRIBUTES[code_point]['category'] in ['Zl', 'Zp']
or
(UNICODE_ATTRIBUTES[code_point]['category'] in ['Zs']
and
'<noBreak>' not in
UNICODE_ATTRIBUTES[code_point]['decomposition']))))
def is_cntrl(code_point):
'''Checks whether the character with this code point is
a control character'''
return (UNICODE_ATTRIBUTES[code_point]['name']
and (UNICODE_ATTRIBUTES[code_point]['name'] == '<control>'
or
UNICODE_ATTRIBUTES[code_point]['category'] in ['Zl', 'Zp']))
def is_xdigit(code_point):
'''Checks whether the character with this code point is
a hexadecimal digit'''
if False:
return (is_digit(code_point)
or (code_point >= 0x0041 and code_point <= 0x0046)
or (code_point >= 0x0061 and code_point <= 0x0066))
else:
# SUSV2 gives us some freedom for the "xdigit" category, but ISO C 99
# takes it away:
# 7.25.2.1.12:
# The iswxdigit function tests for any wide character that
# corresponds to a hexadecimal-digit character (as defined
# in 6.4.4.1).
# 6.4.4.1:
# hexadecimal-digit: one of
# 0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F
return ((code_point >= 0x0030 and code_point <= 0x0039)
or (code_point >= 0x0041 and code_point <= 0x0046)
or (code_point >= 0x0061 and code_point <= 0x0066))
def is_graph(code_point):
'''Checks whether the character with this code point is
a graphical character'''
return (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['name'] != '<control>'
and not is_space(code_point))
def is_print(code_point):
'''Checks whether the character with this code point is printable'''
return (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['name'] != '<control>'
and UNICODE_ATTRIBUTES[code_point]['category'] not in ['Zl', 'Zp'])
def is_punct(code_point):
'''Checks whether the character with this code point is punctuation'''
if False:
return (UNICODE_ATTRIBUTES[code_point]['name']
and UNICODE_ATTRIBUTES[code_point]['category'].startswith('P'))
else:
# The traditional POSIX definition of punctuation is every graphic,
# non-alphanumeric character.
return (is_graph(code_point)
and not is_alpha(code_point)
and not is_digit(code_point))
def is_combining(code_point):
'''Checks whether the character with this code point is
a combining character'''
# Up to Unicode 3.0.1 we took the Combining property from the PropList.txt
# file. In 3.0.1 it was identical to the union of the general categories
# "Mn", "Mc", "Me". In Unicode 3.1 this property has been dropped from the
# PropList.txt file, so we take the latter definition.
return (UNICODE_ATTRIBUTES[code_point]['name']
and
UNICODE_ATTRIBUTES[code_point]['category'] in ['Mn', 'Mc', 'Me'])
def is_combining_level3(code_point):
'''Checks whether the character with this code point is
a combining level3 character'''
return (is_combining(code_point)
and
int(UNICODE_ATTRIBUTES[code_point]['combining']) in range(0, 200))
def ucs_symbol(code_point):
'''Return the UCS symbol string for a Unicode character.'''
if code_point < 0x10000:
return '<U{:04X}>'.format(code_point)
else:
return '<U{:08X}>'.format(code_point)
def ucs_symbol_range(code_point_low, code_point_high):
'''Returns a string UCS symbol string for a code point range.
Example:
<U0041>..<U005A>
'''
return ucs_symbol(code_point_low) + '..' + ucs_symbol(code_point_high)
def verifications():
'''Tests whether the is_* functions observe the known restrictions'''
for code_point in sorted(UNICODE_ATTRIBUTES):
# toupper restriction: "Only characters specified for the keywords
# lower and upper shall be specified.
if (to_upper(code_point) != code_point
and not (is_lower(code_point) or is_upper(code_point))):
sys.stderr.write(
('%(sym)s is not upper|lower '
+ 'but toupper(0x%(c)04X) = 0x%(uc)04X\n') %{
'sym': ucs_symbol(code_point),
'c': code_point,
'uc': to_upper(code_point)})
# tolower restriction: "Only characters specified for the keywords
# lower and upper shall be specified.
if (to_lower(code_point) != code_point
and not (is_lower(code_point) or is_upper(code_point))):
sys.stderr.write(
('%(sym)s is not upper|lower '
+ 'but tolower(0x%(c)04X) = 0x%(uc)04X\n') %{
'sym': ucs_symbol(code_point),
'c': code_point,
'uc': to_lower(code_point)})
# alpha restriction: "Characters classified as either upper or lower
# shall automatically belong to this class.
if ((is_lower(code_point) or is_upper(code_point))
and not is_alpha(code_point)):
sys.stderr.write('%(sym)s is upper|lower but not alpha\n' %{
'sym': ucs_symbol(code_point)})
# alpha restriction: “No character specified for the keywords cntrl,
# digit, punct or space shall be specified.”
if (is_alpha(code_point) and is_cntrl(code_point)):
sys.stderr.write('%(sym)s is alpha and cntrl\n' %{
'sym': ucs_symbol(code_point)})
if (is_alpha(code_point) and is_digit(code_point)):
sys.stderr.write('%(sym)s is alpha and digit\n' %{
'sym': ucs_symbol(code_point)})
if (is_alpha(code_point) and is_punct(code_point)):
sys.stderr.write('%(sym)s is alpha and punct\n' %{
'sym': ucs_symbol(code_point)})
if (is_alpha(code_point) and is_space(code_point)):
sys.stderr.write('%(sym)s is alpha and space\n' %{
'sym': ucs_symbol(code_point)})
# space restriction: “No character specified for the keywords upper,
# lower, alpha, digit, graph or xdigit shall be specified.”
# upper, lower, alpha already checked above.
if (is_space(code_point) and is_digit(code_point)):
sys.stderr.write('%(sym)s is space and digit\n' %{
'sym': ucs_symbol(code_point)})
if (is_space(code_point) and is_graph(code_point)):
sys.stderr.write('%(sym)s is space and graph\n' %{
'sym': ucs_symbol(code_point)})
if (is_space(code_point) and is_xdigit(code_point)):
sys.stderr.write('%(sym)s is space and xdigit\n' %{
'sym': ucs_symbol(code_point)})
# cntrl restriction: “No character specified for the keywords upper,
# lower, alpha, digit, punct, graph, print or xdigit shall be
# specified.” upper, lower, alpha already checked above.
if (is_cntrl(code_point) and is_digit(code_point)):
sys.stderr.write('%(sym)s is cntrl and digit\n' %{
'sym': ucs_symbol(code_point)})
if (is_cntrl(code_point) and is_punct(code_point)):
sys.stderr.write('%(sym)s is cntrl and punct\n' %{
'sym': ucs_symbol(code_point)})
if (is_cntrl(code_point) and is_graph(code_point)):
sys.stderr.write('%(sym)s is cntrl and graph\n' %{
'sym': ucs_symbol(code_point)})
if (is_cntrl(code_point) and is_print(code_point)):
sys.stderr.write('%(sym)s is cntrl and print\n' %{
'sym': ucs_symbol(code_point)})
if (is_cntrl(code_point) and is_xdigit(code_point)):
sys.stderr.write('%(sym)s is cntrl and xdigit\n' %{
'sym': ucs_symbol(code_point)})
# punct restriction: “No character specified for the keywords upper,
# lower, alpha, digit, cntrl, xdigit or as the <space> character shall
# be specified.” upper, lower, alpha, cntrl already checked above.
if (is_punct(code_point) and is_digit(code_point)):
sys.stderr.write('%(sym)s is punct and digit\n' %{
'sym': ucs_symbol(code_point)})
if (is_punct(code_point) and is_xdigit(code_point)):
sys.stderr.write('%(sym)s is punct and xdigit\n' %{
'sym': ucs_symbol(code_point)})
if (is_punct(code_point) and code_point == 0x0020):
sys.stderr.write('%(sym)s is punct\n' %{
'sym': ucs_symbol(code_point)})
# graph restriction: “No character specified for the keyword cntrl
# shall be specified.” Already checked above.
# print restriction: “No character specified for the keyword cntrl
# shall be specified.” Already checked above.
# graph - print relation: differ only in the <space> character.
# How is this possible if there are more than one space character?!
# I think susv2/xbd/locale.html should speak of “space characters”,
# not “space character”.
if (is_print(code_point)
and not (is_graph(code_point) or is_space(code_point))):
sys.stderr.write('%(sym)s is print but not graph|<space>\n' %{
'sym': unicode_utils.ucs_symbol(code_point)})
if (not is_print(code_point)
and (is_graph(code_point) or code_point == 0x0020)):
sys.stderr.write('%(sym)s is graph|<space> but not print\n' %{
'sym': unicode_utils.ucs_symbol(code_point)})
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