Mercurial > babel > old > babel-test
annotate babel/dates.py @ 29:da1c9610e751
More work on timezones.
| author | cmlenz |
|---|---|
| date | Mon, 04 Jun 2007 10:51:38 +0000 |
| parents | c0c92d11f1ab |
| children | 0740b6d31799 |
| rev | line source |
|---|---|
| 1 | 1 # -*- coding: utf-8 -*- |
| 2 # | |
| 3 # Copyright (C) 2007 Edgewall Software | |
| 4 # All rights reserved. | |
| 5 # | |
| 6 # This software is licensed as described in the file COPYING, which | |
| 7 # you should have received as part of this distribution. The terms | |
| 8 # are also available at http://babel.edgewall.org/wiki/License. | |
| 9 # | |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
| 12 # history and logs, available at http://babel.edgewall.org/log/. | |
| 13 | |
| 14 """Locale dependent formatting and parsing of dates and times. | |
| 15 | |
| 16 The default locale for the functions in this module is determined by the | |
| 17 following environment variables, in that order: | |
| 18 | |
| 19 * ``LC_TIME``, | |
| 20 * ``LC_ALL``, and | |
| 21 * ``LANG`` | |
| 22 """ | |
| 23 | |
| 29 | 24 from datetime import date, datetime, time, timedelta, tzinfo |
| 1 | 25 |
| 26 from babel.core import Locale | |
| 29 | 27 from babel.util import default_locale, UTC |
| 1 | 28 |
| 29 __all__ = ['format_date', 'format_datetime', 'format_time', 'parse_date', | |
| 30 'parse_datetime', 'parse_time'] | |
| 31 __docformat__ = 'restructuredtext en' | |
| 32 | |
| 33 LC_TIME = default_locale('LC_TIME') | |
| 34 | |
| 35 def get_period_names(locale=LC_TIME): | |
| 36 """Return the names for day periods (AM/PM) used by the locale. | |
| 37 | |
| 38 >>> get_period_names(locale='en_US')['am'] | |
| 39 u'AM' | |
| 40 | |
| 41 :param locale: the `Locale` object, or a locale string | |
| 42 :return: the dictionary of period names | |
| 43 :rtype: `dict` | |
| 44 """ | |
| 45 return Locale.parse(locale).periods | |
| 46 | |
| 47 def get_day_names(width='wide', context='format', locale=LC_TIME): | |
| 48 """Return the day names used by the locale for the specified format. | |
| 49 | |
| 50 >>> get_day_names('wide', locale='en_US')[1] | |
| 15 | 51 u'Tuesday' |
| 1 | 52 >>> get_day_names('abbreviated', locale='es')[1] |
| 15 | 53 u'mar' |
| 1 | 54 >>> get_day_names('narrow', context='stand-alone', locale='de_DE')[1] |
| 15 | 55 u'D' |
| 1 | 56 |
| 57 :param width: the width to use, one of "wide", "abbreviated", or "narrow" | |
| 58 :param context: the context, either "format" or "stand-alone" | |
| 59 :param locale: the `Locale` object, or a locale string | |
| 60 :return: the dictionary of day names | |
| 61 :rtype: `dict` | |
| 62 """ | |
| 63 return Locale.parse(locale).days[context][width] | |
| 64 | |
| 65 def get_month_names(width='wide', context='format', locale=LC_TIME): | |
| 66 """Return the month names used by the locale for the specified format. | |
| 67 | |
| 68 >>> get_month_names('wide', locale='en_US')[1] | |
| 69 u'January' | |
| 70 >>> get_month_names('abbreviated', locale='es')[1] | |
| 71 u'ene' | |
| 72 >>> get_month_names('narrow', context='stand-alone', locale='de_DE')[1] | |
| 73 u'J' | |
| 74 | |
| 75 :param width: the width to use, one of "wide", "abbreviated", or "narrow" | |
| 76 :param context: the context, either "format" or "stand-alone" | |
| 77 :param locale: the `Locale` object, or a locale string | |
| 78 :return: the dictionary of month names | |
| 79 :rtype: `dict` | |
| 80 """ | |
| 81 return Locale.parse(locale).months[context][width] | |
| 82 | |
| 83 def get_quarter_names(width='wide', context='format', locale=LC_TIME): | |
| 84 """Return the quarter names used by the locale for the specified format. | |
| 85 | |
| 86 >>> get_quarter_names('wide', locale='en_US')[1] | |
| 87 u'1st quarter' | |
| 88 >>> get_quarter_names('abbreviated', locale='de_DE')[1] | |
| 89 u'Q1' | |
| 90 | |
| 91 :param width: the width to use, one of "wide", "abbreviated", or "narrow" | |
| 92 :param context: the context, either "format" or "stand-alone" | |
| 93 :param locale: the `Locale` object, or a locale string | |
| 94 :return: the dictionary of quarter names | |
| 95 :rtype: `dict` | |
| 96 """ | |
| 97 return Locale.parse(locale).quarters[context][width] | |
| 98 | |
| 99 def get_era_names(width='wide', locale=LC_TIME): | |
| 100 """Return the era names used by the locale for the specified format. | |
| 101 | |
| 102 >>> get_era_names('wide', locale='en_US')[1] | |
| 103 u'Anno Domini' | |
| 104 >>> get_era_names('abbreviated', locale='de_DE')[1] | |
| 105 u'n. Chr.' | |
| 106 | |
| 107 :param width: the width to use, either "wide" or "abbreviated" | |
| 108 :param locale: the `Locale` object, or a locale string | |
| 109 :return: the dictionary of era names | |
| 110 :rtype: `dict` | |
| 111 """ | |
| 112 return Locale.parse(locale).eras[width] | |
| 113 | |
| 114 def get_date_format(format='medium', locale=LC_TIME): | |
| 115 """Return the date formatting patterns used by the locale for the specified | |
| 116 format. | |
| 117 | |
| 118 >>> get_date_format(locale='en_US') | |
|
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119 <DateTimePattern u'MMM d, yyyy'> |
| 1 | 120 >>> get_date_format('full', locale='de_DE') |
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121 <DateTimePattern u'EEEE, d. MMMM yyyy'> |
| 1 | 122 |
| 123 :param format: the format to use, one of "full", "long", "medium", or | |
| 124 "short" | |
| 125 :param locale: the `Locale` object, or a locale string | |
| 126 :return: the date format pattern | |
| 127 :rtype: `dict` | |
| 128 """ | |
| 129 return Locale.parse(locale).date_formats[format] | |
| 130 | |
| 131 def get_time_format(format='medium', locale=LC_TIME): | |
| 132 """Return the time formatting patterns used by the locale for the specified | |
| 133 format. | |
| 134 | |
| 135 >>> get_time_format(locale='en_US') | |
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136 <DateTimePattern u'h:mm:ss a'> |
| 1 | 137 >>> get_time_format('full', locale='de_DE') |
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138 <DateTimePattern u"H:mm' Uhr 'z"> |
| 1 | 139 |
| 140 :param format: the format to use, one of "full", "long", "medium", or | |
| 141 "short" | |
| 142 :param locale: the `Locale` object, or a locale string | |
| 143 :return: the time format pattern | |
| 144 :rtype: `dict` | |
| 145 """ | |
| 146 return Locale.parse(locale).time_formats[format] | |
| 147 | |
| 148 def format_date(date, format='medium', locale=LC_TIME): | |
| 149 """Returns a date formatted according to the given pattern. | |
| 150 | |
| 151 >>> d = date(2007, 04, 01) | |
| 152 >>> format_date(d, locale='en_US') | |
| 153 u'Apr 1, 2007' | |
| 154 >>> format_date(d, format='full', locale='de_DE') | |
| 155 u'Sonntag, 1. April 2007' | |
| 156 | |
| 16 | 157 If you don't want to use the locale default formats, you can specify a |
| 158 custom date pattern: | |
| 159 | |
| 29 | 160 >>> format_date(d, "EEE, MMM d, ''yy", locale='en') |
| 16 | 161 u"Sun, Apr 1, '07" |
| 162 | |
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163 :param date: the ``date`` or ``datetime`` object |
| 16 | 164 :param format: one of "full", "long", "medium", or "short", or a custom |
| 165 date/time pattern | |
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166 :param locale: a `Locale` object or a locale identifier |
| 1 | 167 :rtype: `unicode` |
|
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168 |
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169 :note: If the pattern contains time fields, an `AttributeError` will be |
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170 raised when trying to apply the formatting. This is also true if |
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171 the value of ``date`` parameter is actually a ``datetime`` object, |
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172 as this function automatically converts that to a ``date``. |
| 1 | 173 """ |
|
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174 if isinstance(date, datetime): |
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175 date = date.date() |
| 1 | 176 locale = Locale.parse(locale) |
| 177 if format in ('full', 'long', 'medium', 'short'): | |
| 178 format = get_date_format(format, locale=locale) | |
| 179 pattern = parse_pattern(format) | |
| 180 return parse_pattern(format).apply(date, locale) | |
| 181 | |
| 29 | 182 def format_datetime(datetime, format='medium', tzinfo=UTC, locale=LC_TIME): |
| 1 | 183 """Returns a date formatted according to the given pattern. |
| 184 | |
| 185 :param datetime: the ``date`` object | |
| 16 | 186 :param format: one of "full", "long", "medium", or "short", or a custom |
| 187 date/time pattern | |
| 29 | 188 :param tzinfo: the timezone to apply to the time for display |
|
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189 :param locale: a `Locale` object or a locale identifier |
| 1 | 190 :rtype: `unicode` |
| 191 """ | |
|
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192 locale = Locale.parse(locale) |
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193 if format in ('full', 'long', 'medium', 'short'): |
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194 raise NotImplementedError |
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195 pattern = parse_pattern(format) |
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196 return parse_pattern(format).apply(datetime, locale) |
| 1 | 197 |
| 29 | 198 def format_time(time, format='medium', tzinfo=UTC, locale=LC_TIME): |
| 1 | 199 """Returns a time formatted according to the given pattern. |
| 200 | |
| 201 >>> t = time(15, 30) | |
| 202 >>> format_time(t, locale='en_US') | |
| 203 u'3:30:00 PM' | |
| 204 >>> format_time(t, format='short', locale='de_DE') | |
| 205 u'15:30' | |
| 206 | |
| 16 | 207 If you don't want to use the locale default formats, you can specify a |
| 208 custom time pattern: | |
| 209 | |
| 210 >>> format_time(t, "hh 'o''clock' a", locale='en') | |
| 211 u"03 o'clock PM" | |
| 212 | |
| 29 | 213 For any pattern requiring the display of the time-zone, the third-party |
| 214 ``pytz`` package is needed to explicitly specify the time-zone: | |
| 215 | |
| 216 >>> from pytz import timezone | |
| 217 >>> cet = timezone('Europe/Berlin') | |
| 218 >>> format_time(t, format='full', tzinfo=cet, locale='de_DE') | |
| 219 u'15:30 Uhr MEZ' | |
| 220 | |
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221 :param time: the ``time`` or ``datetime`` object |
| 16 | 222 :param format: one of "full", "long", "medium", or "short", or a custom |
| 223 date/time pattern | |
| 29 | 224 :param tzinfo: the time-zone to apply to the time for display |
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225 :param locale: a `Locale` object or a locale identifier |
| 1 | 226 :rtype: `unicode` |
|
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227 |
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228 :note: If the pattern contains date fields, an `AttributeError` will be |
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229 raised when trying to apply the formatting. This is also true if |
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230 the value of ``time`` parameter is actually a ``datetime`` object, |
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231 as this function automatically converts that to a ``time``. |
| 1 | 232 """ |
|
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233 if isinstance(time, (int, long)): |
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234 time = datetime.fromtimestamp(time).time() |
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235 elif isinstance(time, datetime): |
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236 time = time.time() |
| 29 | 237 if time.tzinfo is None: |
| 238 time = time.replace(tzinfo=tzinfo) | |
| 1 | 239 locale = Locale.parse(locale) |
| 240 if format in ('full', 'long', 'medium', 'short'): | |
| 241 format = get_time_format(format, locale=locale) | |
| 242 return parse_pattern(format).apply(time, locale) | |
| 243 | |
| 244 def parse_date(string, locale=LC_TIME): | |
| 245 raise NotImplementedError | |
| 246 | |
| 247 def parse_datetime(string, locale=LC_TIME): | |
| 248 raise NotImplementedError | |
| 249 | |
| 250 def parse_time(string, locale=LC_TIME): | |
| 251 raise NotImplementedError | |
| 252 | |
| 253 | |
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254 class DateTimePattern(object): |
| 1 | 255 |
| 256 def __init__(self, pattern, format): | |
| 257 self.pattern = pattern | |
| 258 self.format = format | |
| 259 | |
| 260 def __repr__(self): | |
| 261 return '<%s %r>' % (type(self).__name__, self.pattern) | |
| 262 | |
| 263 def __unicode__(self): | |
| 264 return self.pattern | |
| 265 | |
| 266 def __mod__(self, other): | |
| 267 assert type(other) is DateTimeFormat | |
| 268 return self.format % other | |
| 269 | |
| 270 def apply(self, datetime, locale): | |
| 271 return self % DateTimeFormat(datetime, locale) | |
| 272 | |
| 273 | |
| 274 class DateTimeFormat(object): | |
| 275 | |
| 276 def __init__(self, value, locale): | |
| 277 assert isinstance(value, (date, datetime, time)) | |
| 29 | 278 if isinstance(value, (datetime, time)) and value.tzinfo is None: |
| 279 value = value.replace(tzinfo=UTC) | |
| 1 | 280 self.value = value |
| 281 self.locale = Locale.parse(locale) | |
| 282 | |
| 283 def __getitem__(self, name): | |
| 284 # TODO: a number of fields missing here | |
| 15 | 285 char = name[0] |
| 286 num = len(name) | |
| 287 if char == 'G': | |
| 288 return self.format_era(char, num) | |
| 289 elif char in ('y', 'Y'): | |
| 290 return self.format_year(char, num) | |
| 291 elif char in ('Q', 'q'): | |
| 292 return self.format_quarter(char, num) | |
| 293 elif char in ('M', 'L'): | |
| 294 return self.format_month(char, num) | |
| 295 elif char == 'd': | |
| 296 return self.format(self.value.day, num) | |
| 297 elif char in ('E', 'e', 'c'): | |
| 298 return self.format_weekday(char, num) | |
| 299 elif char == 'a': | |
| 300 return self.format_period(char) | |
| 301 elif char == 'h': | |
| 302 return self.format(self.value.hour % 12, num) | |
| 303 elif char == 'H': | |
| 304 return self.format(self.value.hour, num) | |
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305 elif char == 'K': |
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306 return self.format(self.value.hour % 12 - 1, num) |
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307 elif char == 'k': |
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308 return self.format(self.value.hour + 1, num) |
| 15 | 309 elif char == 'm': |
| 310 return self.format(self.value.minute, num) | |
| 311 elif char == 's': | |
| 312 return self.format(self.value.second, num) | |
| 29 | 313 elif char in ('z', 'Z', 'v'): |
| 314 return self.format_timezone(char, num) | |
| 1 | 315 else: |
| 15 | 316 raise KeyError('Unsupported date/time field %r' % char) |
| 1 | 317 |
| 15 | 318 def format_era(self, char, num): |
| 1 | 319 width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[max(3, num)] |
| 320 era = int(self.value.year >= 0) | |
| 321 return get_era_names(width, self.locale)[era] | |
| 322 | |
| 15 | 323 def format_year(self, char, num): |
| 324 if char.islower(): | |
| 325 value = self.value.year | |
| 326 else: | |
| 327 value = self.value.isocalendar()[0] | |
| 1 | 328 year = self.format(value, num) |
| 329 if num == 2: | |
| 330 year = year[-2:] | |
| 331 return year | |
| 332 | |
| 15 | 333 def format_month(self, char, num): |
| 1 | 334 if num <= 2: |
| 335 return ('%%0%dd' % num) % self.value.month | |
| 336 width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num] | |
| 15 | 337 context = {3: 'format', 4: 'format', 5: 'stand-alone'}[num] |
| 1 | 338 return get_month_names(width, context, self.locale)[self.value.month] |
| 339 | |
| 15 | 340 def format_weekday(self, char, num): |
| 341 if num < 3: | |
| 342 if char.islower(): | |
| 343 value = 7 - self.locale.first_week_day + self.value.weekday() | |
| 344 return self.format(value % 7 + 1, num) | |
| 345 num = 3 | |
| 346 weekday = self.value.weekday() | |
| 347 width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num] | |
| 348 context = {3: 'format', 4: 'format', 5: 'stand-alone'}[num] | |
| 1 | 349 return get_day_names(width, context, self.locale)[weekday] |
| 350 | |
| 15 | 351 def format_period(self, char): |
| 1 | 352 period = {0: 'am', 1: 'pm'}[int(self.value.hour > 12)] |
| 353 return get_period_names(locale=self.locale)[period] | |
| 354 | |
| 29 | 355 def format_timezone(self, char, num): |
| 356 if char == 'z': | |
| 357 zone = self.value.tzinfo.zone | |
| 358 if num < 4: | |
| 359 return self.locale.time_zones[zone]['short'][ | |
| 360 self.value.dst() and 'daylight' or 'standard' | |
| 361 ] | |
| 362 else: | |
| 363 return self.locale.time_zones[zone]['long'][ | |
| 364 self.value.dst() and 'daylight' or 'standard' | |
| 365 ] | |
| 366 | |
| 367 elif char == 'Z': | |
| 368 offset = self.value.utcoffset() | |
| 369 hours, seconds = divmod(offset.seconds, 3600) | |
| 370 minutes = seconds // 60 | |
| 371 sign = '+' | |
| 372 if offset.seconds < 0: | |
| 373 sign = '-' | |
| 374 pattern = {3: '%s%02d%02d', 4: 'GMT %s%02d:%02d'}[max(3, num)] | |
| 375 return pattern % (sign, hours, minutes) | |
| 376 | |
| 377 elif char == 'v': | |
| 378 raise NotImplementedError | |
| 379 | |
| 1 | 380 def format(self, value, length): |
| 381 return ('%%0%dd' % length) % value | |
| 382 | |
| 383 | |
| 384 PATTERN_CHARS = { | |
| 15 | 385 'G': [1, 2, 3, 4, 5], # era |
| 386 'y': None, 'Y': None, 'u': None, # year | |
| 387 'Q': [1, 2, 3, 4], 'q': [1, 2, 3, 4], # quarter | |
| 388 'M': [1, 2, 3, 4, 5], 'L': [1, 2, 3, 4, 5], # month | |
| 389 'w': [1, 2], 'W': [1], # week | |
| 390 'd': [1, 2], 'D': [1, 2, 3], 'F': [1], 'g': None, # day | |
| 391 'E': [1, 2, 3, 4, 5], 'e': [1, 2, 3, 4, 5], 'c': [1, 3, 4, 5], # week day | |
| 392 'a': [1], # period | |
| 393 'h': [1, 2], 'H': [1, 2], 'K': [1, 2], 'k': [1, 2], # hour | |
| 394 'm': [1, 2], # minute | |
| 395 's': [1, 2], 'S': None, 'A': None, # second | |
| 396 'z': [1, 2, 3, 4], 'Z': [1, 2, 3, 4], 'v': [1, 4] # zone | |
| 1 | 397 } |
| 398 | |
| 399 def parse_pattern(pattern): | |
| 400 """Parse date, time, and datetime format patterns. | |
| 401 | |
| 402 >>> parse_pattern("MMMMd").format | |
| 403 u'%(MMMM)s%(d)s' | |
| 404 >>> parse_pattern("MMM d, yyyy").format | |
| 405 u'%(MMM)s %(d)s, %(yyyy)s' | |
| 16 | 406 |
| 407 Pattern can contain literal strings in single quotes: | |
| 408 | |
| 1 | 409 >>> parse_pattern("H:mm' Uhr 'z").format |
| 410 u'%(H)s:%(mm)s Uhr %(z)s' | |
| 411 | |
| 16 | 412 An actual single quote can be used by using two adjacent single quote |
| 413 characters: | |
| 414 | |
| 415 >>> parse_pattern("hh' o''clock'").format | |
| 416 u"%(hh)s o'clock" | |
| 417 | |
| 1 | 418 :param pattern: the formatting pattern to parse |
| 419 """ | |
|
12
a2c54ef107c2
* Removed pkg_resources/setuptools requirement from various places.
cmlenz
parents:
8
diff
changeset
|
420 if type(pattern) is DateTimePattern: |
| 1 | 421 return pattern |
| 422 | |
| 423 result = [] | |
| 424 quotebuf = None | |
| 425 charbuf = [] | |
| 426 fieldchar = [''] | |
| 427 fieldnum = [0] | |
| 428 | |
| 429 def append_chars(): | |
| 430 result.append(''.join(charbuf).replace('%', '%%')) | |
| 431 del charbuf[:] | |
| 432 | |
| 433 def append_field(): | |
| 434 limit = PATTERN_CHARS[fieldchar[0]] | |
| 15 | 435 if limit and fieldnum[0] not in limit: |
| 1 | 436 raise ValueError('Invalid length for field: %r' |
| 437 % (fieldchar[0] * fieldnum[0])) | |
| 438 result.append('%%(%s)s' % (fieldchar[0] * fieldnum[0])) | |
| 439 fieldchar[0] = '' | |
| 440 fieldnum[0] = 0 | |
| 441 | |
| 16 | 442 for idx, char in enumerate(pattern.replace("''", '\0')): |
| 1 | 443 if quotebuf is None: |
| 444 if char == "'": # quote started | |
| 445 if fieldchar[0]: | |
| 446 append_field() | |
| 447 elif charbuf: | |
| 448 append_chars() | |
| 449 quotebuf = [] | |
| 450 elif char in PATTERN_CHARS: | |
| 451 if charbuf: | |
| 452 append_chars() | |
| 453 if char == fieldchar[0]: | |
| 454 fieldnum[0] += 1 | |
| 455 else: | |
| 456 if fieldchar[0]: | |
| 457 append_field() | |
| 458 fieldchar[0] = char | |
| 459 fieldnum[0] = 1 | |
| 460 else: | |
| 461 if fieldchar[0]: | |
| 462 append_field() | |
| 463 charbuf.append(char) | |
| 464 | |
| 465 elif quotebuf is not None: | |
| 16 | 466 if char == "'": # end of quote |
| 1 | 467 charbuf.extend(quotebuf) |
| 468 quotebuf = None | |
| 469 else: # inside quote | |
| 470 quotebuf.append(char) | |
| 471 | |
| 472 if fieldchar[0]: | |
| 473 append_field() | |
| 474 elif charbuf: | |
| 475 append_chars() | |
| 476 | |
| 16 | 477 return DateTimePattern(pattern, u''.join(result).replace('\0', "'")) |