python – 正则表达式从给定类型的字符串中获取多个日期

class DateParser(object):
    """parse dates according to the custom rules here:

    >>> DateParser("Sat 1 Dec - 11h + 14h / Sun 2 Dec - 12h30").parse()
    ("Sat 1 Dec 11h","Sun 2 Dec 12h30")
    >>> DateParser("Tue 27 + Wed 28 Nov - 20h30").parse()
    ("Tue 27 Nov 20h30","Wed 28 Nov 20h30")
    >>> DateParser("Fri 4 + Sat 5 Jan - 20h30").parse()
    ("Fri 4 Jan 20h30","Sat 5 Jan 20h30")
    >>> DateParser("Wed 23 Jan - 20h").parse()
    ("Wed 23 Jan 20h")
    >>> DateParser("Sat 26 Jan - 11h + 14h / Sun 27 Jan - 11h").parse()
    ("Sat 26 Jan 11h","Sun 27 Jan 11h")
    >>> DateParser("Fri 8 and Sat 9 Feb - 20h30 + thu 1 feb - 15h").parse()
    ("Fri 8 Feb 20h30","Thu 1 feb 15h")
    >>> DateParse("Sat 2 Mar - 11h + 14h / Sun 3 Mar - 11h").parse()
    ("Sat 2 Mar 11h","Sun 3 Mar 11h")
    >>> DateParser("Wed 12,Fri 14 and Sat 15 Jun - 19h + Sun 16 Jun - 12h30").parse()
    ("Wed 12 Jun 19h","Sun 16 Jun 12h30")
    """

    def __init__(self,line):
        self.date  = line
        self.dates = self.split_dates(line)
        self.final = []

        self.days = ['mon','tue','wed','thu','fri','sat','sun']
        self.mons = ['jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec']

    def parse(self):
        if self.is_complex():
            self.parse_complex()
        else:
            self.parse_simple()

        return tuple(self.final)

    def parse_simple(self):
        """typical formats: 
        Day 00 + Day 01 Mon - 00h00
        Day 00 Mon - 00h00 + 01h00
        Day 00 Mon - 00h00 / Day 02 Mon - 00h00
        """

        for date in self.dates:
            mods = self.split_modifiers(date)

            date_mods = []
            for mod in mods:
                if self.is_complete(mod):
                    #only *one* base_date
                    base_date,time = self.split_time(mod)
                    date_mods.append(time)
                else:
                    date_mods.append(mod)

            for mod in date_mods:
                if self.is_hour(mod):
                    #Sat 1 Dec - 11h + 14h
                    self.final.append(' '.join([base_date,mod]))
                else:
                    #Fri 4 + Sat 5 Jan - 20h30
                    self.final.append(' '.join([mod,self.extract_month(base_date),time]))

    def parse_complex(self):
        """typical format:
        Day 00,Day 01 and Day 02 Mon - 00h00 + Day 03 Mon 01h00
        """
        raise NotImplementedError()


    def is_complex(self):
        """presence of the complex date attribute requires special parsing"""
        return self.date.find(' and ') > -1

    def is_complete(self,section):
        """section has format `Day 00 Mon - 00h00`
        must have no modifiers to determine completeness
        """
        sections = map(lambda x: x.lower(),section.split())

        try:
            dow,dom,moy,dash,time = sections
        except ValueError,e:
            return False

        return all([dow in self.days,moy in self.mons])


    def is_hour(self,section):
        return section[0].isdigit()

    def is_day(self,section):
        return section[:3].lower() in self.days


    def extract_month(self,section):
        """return the month present in the string,if any"""
        for mon in self.mons:
            if section.lower().find(mon) > -1:
                found = section.lower().index(mon)
                return section[found : found + 3]
        return None


    def split_dates(self,section):
        """split individual dates from a list of dates"""
        return section.split(' / ')

    def split_time(self,section):
        """split individual times from a complete date"""
        return section.split(' - ')

    def split_modifiers(self,section):
        """extend a date by implying that they share a date or a time
        modifiers change their meaning when parsing a complex date
        """
        return section.split(' + ')

>>> DateParser("Fri 4 + Sat 5 Jan - 20h30 / Sat 1 Dec - 11h + 14h + 16h / Sun 2 Dec - 12h30").parse()
('Fri 4 Jan 20h30','Sat 5 Jan 20h30','Sat 1 Dec 11h','Sat 1 Dec 14h','Sat 1 Dec 16h','Sun 2 Dec 12h30')

如果您对我上课的方式有疑问,请随时回复我,我可以帮助您.这个问题比我最初想的要复杂得多,我需要先做一些其他事情.