Mercurial > babel > old > babel-test
annotate babel/dates.py @ 18:77a68f88f6bc
Started documentation for date formatting, plus some code tweaks in that area.
| author | cmlenz |
|---|---|
| date | Thu, 31 May 2007 17:10:47 +0000 |
| parents | ed154241c08d |
| children | c0c92d11f1ab |
| 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 | |
| 24 from datetime import date, datetime, time | |
| 25 | |
| 26 from babel.core import Locale | |
| 27 from babel.util import default_locale | |
| 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 | |
| 160 >>> format_time(d, "EEE, MMM d, ''yy", locale='en') | |
| 161 u"Sun, Apr 1, '07" | |
| 162 | |
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163 If the pattern contains time fields, an `AttributeError` will be raised |
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164 when trying to apply the formatting: |
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165 |
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166 >>> format_date(d, "yyyy-MM-dd HH:mm", locale='en_US') |
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167 Traceback (most recent call last): |
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168 ... |
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169 AttributeError: 'datetime.date' object has no attribute 'hour' |
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170 |
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171 This is also true if the value of ``date`` parameter is a ``datetime`` |
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172 object, as this function automatically converts it to a ``date``:: |
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173 |
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174 >>> dt = datetime(2007, 04, 01, 15, 30) |
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175 >>> format_date(dt, "yyyy-MM-dd HH:mm", locale='en_US') |
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176 Traceback (most recent call last): |
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177 ... |
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178 AttributeError: 'datetime.date' object has no attribute 'hour' |
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179 |
| 1 | 180 :param date: the ``date`` object |
| 16 | 181 :param format: one of "full", "long", "medium", or "short", or a custom |
| 182 date/time pattern | |
| 1 | 183 :param locale: a `Locale` object or a locale string |
| 184 :rtype: `unicode` | |
| 185 """ | |
|
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186 if isinstance(date, datetime): |
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187 date = date.date() |
| 1 | 188 locale = Locale.parse(locale) |
| 189 if format in ('full', 'long', 'medium', 'short'): | |
| 190 format = get_date_format(format, locale=locale) | |
| 191 pattern = parse_pattern(format) | |
| 192 return parse_pattern(format).apply(date, locale) | |
| 193 | |
| 194 def format_datetime(datetime, format='medium', locale=LC_TIME): | |
| 195 """Returns a date formatted according to the given pattern. | |
| 196 | |
| 197 :param datetime: the ``date`` object | |
| 16 | 198 :param format: one of "full", "long", "medium", or "short", or a custom |
| 199 date/time pattern | |
| 1 | 200 :param locale: a `Locale` object or a locale string |
| 201 :rtype: `unicode` | |
| 202 """ | |
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203 locale = Locale.parse(locale) |
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204 if format in ('full', 'long', 'medium', 'short'): |
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205 raise NotImplementedError |
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206 pattern = parse_pattern(format) |
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207 return parse_pattern(format).apply(datetime, locale) |
| 1 | 208 |
| 209 def format_time(time, format='medium', locale=LC_TIME): | |
| 210 """Returns a time formatted according to the given pattern. | |
| 211 | |
| 212 >>> t = time(15, 30) | |
| 213 >>> format_time(t, locale='en_US') | |
| 214 u'3:30:00 PM' | |
| 215 >>> format_time(t, format='short', locale='de_DE') | |
| 216 u'15:30' | |
| 217 | |
| 16 | 218 If you don't want to use the locale default formats, you can specify a |
| 219 custom time pattern: | |
| 220 | |
| 221 >>> format_time(t, "hh 'o''clock' a", locale='en') | |
| 222 u"03 o'clock PM" | |
| 223 | |
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224 If the pattern contains date fields, an `AttributeError` will be raised |
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225 when trying to apply the formatting: |
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226 |
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227 >>> format_time(t, "yyyy-MM-dd HH:mm", locale='en_US') |
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228 Traceback (most recent call last): |
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229 ... |
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230 AttributeError: 'datetime.time' object has no attribute 'year' |
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231 |
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232 This is also true if the value of ``time`` parameter is a ``datetime`` |
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233 object, as this function automatically converts it to a ``time``:: |
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234 |
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235 >>> dt = datetime(2007, 04, 01, 15, 30) |
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236 >>> format_time(dt, "yyyy-MM-dd HH:mm", locale='en_US') |
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237 Traceback (most recent call last): |
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238 ... |
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239 AttributeError: 'datetime.time' object has no attribute 'year' |
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240 |
| 1 | 241 :param time: the ``time`` object |
| 16 | 242 :param format: one of "full", "long", "medium", or "short", or a custom |
| 243 date/time pattern | |
| 1 | 244 :param locale: a `Locale` object or a locale string |
| 245 :rtype: `unicode` | |
| 246 """ | |
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247 if isinstance(time, (int, long)): |
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248 time = datetime.fromtimestamp(time).time() |
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249 elif isinstance(time, datetime): |
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250 time = time.time() |
| 1 | 251 locale = Locale.parse(locale) |
| 252 if format in ('full', 'long', 'medium', 'short'): | |
| 253 format = get_time_format(format, locale=locale) | |
| 254 return parse_pattern(format).apply(time, locale) | |
| 255 | |
| 256 def parse_date(string, locale=LC_TIME): | |
| 257 raise NotImplementedError | |
| 258 | |
| 259 def parse_datetime(string, locale=LC_TIME): | |
| 260 raise NotImplementedError | |
| 261 | |
| 262 def parse_time(string, locale=LC_TIME): | |
| 263 raise NotImplementedError | |
| 264 | |
| 265 | |
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266 class DateTimePattern(object): |
| 1 | 267 |
| 268 def __init__(self, pattern, format): | |
| 269 self.pattern = pattern | |
| 270 self.format = format | |
| 271 | |
| 272 def __repr__(self): | |
| 273 return '<%s %r>' % (type(self).__name__, self.pattern) | |
| 274 | |
| 275 def __unicode__(self): | |
| 276 return self.pattern | |
| 277 | |
| 278 def __mod__(self, other): | |
| 279 assert type(other) is DateTimeFormat | |
| 280 return self.format % other | |
| 281 | |
| 282 def apply(self, datetime, locale): | |
| 283 return self % DateTimeFormat(datetime, locale) | |
| 284 | |
| 285 | |
| 286 class DateTimeFormat(object): | |
| 287 | |
| 288 def __init__(self, value, locale): | |
| 289 assert isinstance(value, (date, datetime, time)) | |
| 290 self.value = value | |
| 291 self.locale = Locale.parse(locale) | |
| 292 | |
| 293 def __getitem__(self, name): | |
| 294 # TODO: a number of fields missing here | |
| 15 | 295 char = name[0] |
| 296 num = len(name) | |
| 297 if char == 'G': | |
| 298 return self.format_era(char, num) | |
| 299 elif char in ('y', 'Y'): | |
| 300 return self.format_year(char, num) | |
| 301 elif char in ('Q', 'q'): | |
| 302 return self.format_quarter(char, num) | |
| 303 elif char in ('M', 'L'): | |
| 304 return self.format_month(char, num) | |
| 305 elif char == 'd': | |
| 306 return self.format(self.value.day, num) | |
| 307 elif char in ('E', 'e', 'c'): | |
| 308 return self.format_weekday(char, num) | |
| 309 elif char == 'a': | |
| 310 return self.format_period(char) | |
| 311 elif char == 'h': | |
| 312 return self.format(self.value.hour % 12, num) | |
| 313 elif char == 'H': | |
| 314 return self.format(self.value.hour, num) | |
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315 elif char == 'K': |
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316 return self.format(self.value.hour % 12 - 1, num) |
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317 elif char == 'k': |
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318 return self.format(self.value.hour + 1, num) |
| 15 | 319 elif char == 'm': |
| 320 return self.format(self.value.minute, num) | |
| 321 elif char == 's': | |
| 322 return self.format(self.value.second, num) | |
| 1 | 323 else: |
| 15 | 324 raise KeyError('Unsupported date/time field %r' % char) |
| 1 | 325 |
| 15 | 326 def format_era(self, char, num): |
| 1 | 327 width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[max(3, num)] |
| 328 era = int(self.value.year >= 0) | |
| 329 return get_era_names(width, self.locale)[era] | |
| 330 | |
| 15 | 331 def format_year(self, char, num): |
| 332 if char.islower(): | |
| 333 value = self.value.year | |
| 334 else: | |
| 335 value = self.value.isocalendar()[0] | |
| 1 | 336 year = self.format(value, num) |
| 337 if num == 2: | |
| 338 year = year[-2:] | |
| 339 return year | |
| 340 | |
| 15 | 341 def format_month(self, char, num): |
| 1 | 342 if num <= 2: |
| 343 return ('%%0%dd' % num) % self.value.month | |
| 344 width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num] | |
| 15 | 345 context = {3: 'format', 4: 'format', 5: 'stand-alone'}[num] |
| 1 | 346 return get_month_names(width, context, self.locale)[self.value.month] |
| 347 | |
| 15 | 348 def format_weekday(self, char, num): |
| 349 if num < 3: | |
| 350 if char.islower(): | |
| 351 value = 7 - self.locale.first_week_day + self.value.weekday() | |
| 352 return self.format(value % 7 + 1, num) | |
| 353 num = 3 | |
| 354 weekday = self.value.weekday() | |
| 355 width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num] | |
| 356 context = {3: 'format', 4: 'format', 5: 'stand-alone'}[num] | |
| 1 | 357 return get_day_names(width, context, self.locale)[weekday] |
| 358 | |
| 15 | 359 def format_period(self, char): |
| 1 | 360 period = {0: 'am', 1: 'pm'}[int(self.value.hour > 12)] |
| 361 return get_period_names(locale=self.locale)[period] | |
| 362 | |
| 363 def format(self, value, length): | |
| 364 return ('%%0%dd' % length) % value | |
| 365 | |
| 366 | |
| 367 PATTERN_CHARS = { | |
| 15 | 368 'G': [1, 2, 3, 4, 5], # era |
| 369 'y': None, 'Y': None, 'u': None, # year | |
| 370 'Q': [1, 2, 3, 4], 'q': [1, 2, 3, 4], # quarter | |
| 371 'M': [1, 2, 3, 4, 5], 'L': [1, 2, 3, 4, 5], # month | |
| 372 'w': [1, 2], 'W': [1], # week | |
| 373 'd': [1, 2], 'D': [1, 2, 3], 'F': [1], 'g': None, # day | |
| 374 'E': [1, 2, 3, 4, 5], 'e': [1, 2, 3, 4, 5], 'c': [1, 3, 4, 5], # week day | |
| 375 'a': [1], # period | |
| 376 'h': [1, 2], 'H': [1, 2], 'K': [1, 2], 'k': [1, 2], # hour | |
| 377 'm': [1, 2], # minute | |
| 378 's': [1, 2], 'S': None, 'A': None, # second | |
| 379 'z': [1, 2, 3, 4], 'Z': [1, 2, 3, 4], 'v': [1, 4] # zone | |
| 1 | 380 } |
| 381 | |
| 382 def parse_pattern(pattern): | |
| 383 """Parse date, time, and datetime format patterns. | |
| 384 | |
| 385 >>> parse_pattern("MMMMd").format | |
| 386 u'%(MMMM)s%(d)s' | |
| 387 >>> parse_pattern("MMM d, yyyy").format | |
| 388 u'%(MMM)s %(d)s, %(yyyy)s' | |
| 16 | 389 |
| 390 Pattern can contain literal strings in single quotes: | |
| 391 | |
| 1 | 392 >>> parse_pattern("H:mm' Uhr 'z").format |
| 393 u'%(H)s:%(mm)s Uhr %(z)s' | |
| 394 | |
| 16 | 395 An actual single quote can be used by using two adjacent single quote |
| 396 characters: | |
| 397 | |
| 398 >>> parse_pattern("hh' o''clock'").format | |
| 399 u"%(hh)s o'clock" | |
| 400 | |
| 1 | 401 :param pattern: the formatting pattern to parse |
| 402 """ | |
|
12
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* Removed pkg_resources/setuptools requirement from various places.
cmlenz
parents:
8
diff
changeset
|
403 if type(pattern) is DateTimePattern: |
| 1 | 404 return pattern |
| 405 | |
| 406 result = [] | |
| 407 quotebuf = None | |
| 408 charbuf = [] | |
| 409 fieldchar = [''] | |
| 410 fieldnum = [0] | |
| 411 | |
| 412 def append_chars(): | |
| 413 result.append(''.join(charbuf).replace('%', '%%')) | |
| 414 del charbuf[:] | |
| 415 | |
| 416 def append_field(): | |
| 417 limit = PATTERN_CHARS[fieldchar[0]] | |
| 15 | 418 if limit and fieldnum[0] not in limit: |
| 1 | 419 raise ValueError('Invalid length for field: %r' |
| 420 % (fieldchar[0] * fieldnum[0])) | |
| 421 result.append('%%(%s)s' % (fieldchar[0] * fieldnum[0])) | |
| 422 fieldchar[0] = '' | |
| 423 fieldnum[0] = 0 | |
| 424 | |
| 16 | 425 for idx, char in enumerate(pattern.replace("''", '\0')): |
| 1 | 426 if quotebuf is None: |
| 427 if char == "'": # quote started | |
| 428 if fieldchar[0]: | |
| 429 append_field() | |
| 430 elif charbuf: | |
| 431 append_chars() | |
| 432 quotebuf = [] | |
| 433 elif char in PATTERN_CHARS: | |
| 434 if charbuf: | |
| 435 append_chars() | |
| 436 if char == fieldchar[0]: | |
| 437 fieldnum[0] += 1 | |
| 438 else: | |
| 439 if fieldchar[0]: | |
| 440 append_field() | |
| 441 fieldchar[0] = char | |
| 442 fieldnum[0] = 1 | |
| 443 else: | |
| 444 if fieldchar[0]: | |
| 445 append_field() | |
| 446 charbuf.append(char) | |
| 447 | |
| 448 elif quotebuf is not None: | |
| 16 | 449 if char == "'": # end of quote |
| 1 | 450 charbuf.extend(quotebuf) |
| 451 quotebuf = None | |
| 452 else: # inside quote | |
| 453 quotebuf.append(char) | |
| 454 | |
| 455 if fieldchar[0]: | |
| 456 append_field() | |
| 457 elif charbuf: | |
| 458 append_chars() | |
| 459 | |
| 16 | 460 return DateTimePattern(pattern, u''.join(result).replace('\0', "'")) |