about summary refs log tree commit diff
path: root/localedata/unicode-gen/unicode_utils.py
blob: f6e75bd0a308956e57a22077ee2f48e2753a5769 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
# Utilities to generate Unicode data for glibc from upstream Unicode data.
#
# Copyright (C) 2014-2018 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/>.

'''
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)})