From: Christopher Lenz <cmlenz@gmail.com>
Date: Tue, 5 Jun 2007 22:59:24 +0000 (+0000)
Subject: Started implementation of datetime parsing, using a very basic approach for now.
X-Git-Tag: 1.0~591
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b3a8a02d321ffcec75facacb8e31efef6f71f33;p=thirdparty%2Fbabel.git

Started implementation of datetime parsing, using a very basic approach for now.
---

diff --git a/babel/dates.py b/babel/dates.py
index 5c8f3478..42a9f24a 100644
--- a/babel/dates.py
+++ b/babel/dates.py
@@ -22,6 +22,7 @@ following environment variables, in that order:
 """
 
 from datetime import date, datetime, time, timedelta, tzinfo
+import re
 
 from babel.core import Locale
 from babel.util import default_locale, UTC
@@ -315,13 +316,84 @@ def format_time(time=None, format='medium', tzinfo=None, locale=LC_TIME):
     return parse_pattern(format).apply(time, locale)
 
 def parse_date(string, locale=LC_TIME):
-    raise NotImplementedError
+    """Parse a date from a string.
+    
+    This function uses the date format for the locale as a hint to determine
+    the order in which the date fields appear in the string.
+    
+    >>> parse_date('4/1/04', locale='en_US')
+    datetime.date(2004, 4, 1)
+    >>> parse_date('01.04.2004', locale='de_DE')
+    datetime.date(2004, 4, 1)
+    
+    :param string: the string containing the date
+    :param locale: a `Locale` object or a locale identifier
+    :return: the parsed date
+    :rtype: `date`
+    """
+    # TODO: try ISO format first?
+    format = get_date_format(locale=locale).pattern.lower()
+    year_idx = format.index('y')
+    month_idx = format.index('m')
+    if month_idx < 0:
+        month_idx = format.index('l')
+    day_idx = format.index('d')
+
+    indexes = [(year_idx, 'Y'), (month_idx, 'M'), (day_idx, 'D')]
+    indexes.sort()
+    indexes = dict([(item[1], idx) for idx, item in enumerate(indexes)])
+
+    # FIXME: this currently only supports numbers, but should also support month
+    #        names, both in the requested locale, and english
+
+    numbers = re.findall('(\d+)', string)
+    year = numbers[indexes['Y']]
+    if len(year) == 2:
+        year = 2000 + int(year)
+    else:
+        year = int(year)
+    month = int(numbers[indexes['M']])
+    day = int(numbers[indexes['D']])
+    if month > 12:
+        month, day = day, month
+    return date(year, month, day)
 
 def parse_datetime(string, locale=LC_TIME):
     raise NotImplementedError
 
 def parse_time(string, locale=LC_TIME):
-    raise NotImplementedError
+    """Parse a tiem from a string.
+    
+    This function uses the time format for the locale as a hint to determine
+    the order in which the time fields appear in the string.
+    
+    >>> parse_time('15:30:00', locale='en_US')
+    datetime.time(15, 30)
+    
+    :param string: the string containing the time
+    :param locale: a `Locale` object or a locale identifier
+    :return: the parsed time
+    :rtype: `time`
+    """
+    # TODO: try ISO format first?
+    format = get_time_format(locale=locale).pattern.lower()
+    hour_idx = format.index('h')
+    if hour_idx < 0:
+        hour_idx = format.index('k')
+    min_idx = format.index('m')
+    sec_idx = format.index('s')
+
+    indexes = [(hour_idx, 'H'), (min_idx, 'M'), (sec_idx, 'S')]
+    indexes.sort()
+    indexes = dict([(item[1], idx) for idx, item in enumerate(indexes)])
+
+    # FIXME: support 12 hour clock, and 0-based hour specification
+
+    numbers = re.findall('(\d+)', string)
+    hour = int(numbers[indexes['H']])
+    minute = int(numbers[indexes['M']])
+    second = int(numbers[indexes['S']])
+    return time(hour, minute, second)
 
 
 class DateTimePattern(object):
diff --git a/doc/index.txt b/doc/index.txt
index 81fd8f3e..9dcb37de 100644
--- a/doc/index.txt
+++ b/doc/index.txt
@@ -58,7 +58,7 @@ localization with respect to the formatting of numbers and dates (the
 this support is based on the assumption that there will be only one specific
 locale used per process (at least simultaneously.) Also, it doesn't provide
 access to other kinds of locale data, such as the localized names of countries,
-languages, or time zones, with are frequently needed in web-based applications.
+languages, or time-zones, which are frequently needed in web-based applications.
 
 For these requirements, Babel includes data extracted from the `Common Locale
 Data Repository (CLDR) <http://unicode.org/cldr/>`_, and provides a number of