def parse()

in lib/dateutil/parser.py [0:0]

• 125 lines of code
• 13 McCabe index (conditional complexity)

    def parse(self, tzstr):
        res = self._result()
        l = _timelex.split(tzstr)
        try:

            len_l = len(l)

            i = 0
            while i < len_l:
                # BRST+3[BRDT[+2]]
                j = i
                while j < len_l and not [x for x in l[j]
                                         if x in "0123456789:,-+"]:
                    j += 1
                if j != i:
                    if not res.stdabbr:
                        offattr = "stdoffset"
                        res.stdabbr = "".join(l[i:j])
                    else:
                        offattr = "dstoffset"
                        res.dstabbr = "".join(l[i:j])
                    i = j
                    if (i < len_l and (l[i] in ('+', '-') or l[i][0] in
                                       "0123456789")):
                        if l[i] in ('+', '-'):
                            # Yes, that's right.  See the TZ variable
                            # documentation.
                            signal = (1, -1)[l[i] == '+']
                            i += 1
                        else:
                            signal = -1
                        len_li = len(l[i])
                        if len_li == 4:
                            # -0300
                            setattr(res, offattr, (int(l[i][:2])*3600 +
                                                   int(l[i][2:])*60)*signal)
                        elif i+1 < len_l and l[i+1] == ':':
                            # -03:00
                            setattr(res, offattr,
                                    (int(l[i])*3600+int(l[i+2])*60)*signal)
                            i += 2
                        elif len_li <= 2:
                            # -[0]3
                            setattr(res, offattr,
                                    int(l[i][:2])*3600*signal)
                        else:
                            return None
                        i += 1
                    if res.dstabbr:
                        break
                else:
                    break

            if i < len_l:
                for j in range(i, len_l):
                    if l[j] == ';':
                        l[j] = ','

                assert l[i] == ','

                i += 1

            if i >= len_l:
                pass
            elif (8 <= l.count(',') <= 9 and
                  not [y for x in l[i:] if x != ','
                       for y in x if y not in "0123456789"]):
                # GMT0BST,3,0,30,3600,10,0,26,7200[,3600]
                for x in (res.start, res.end):
                    x.month = int(l[i])
                    i += 2
                    if l[i] == '-':
                        value = int(l[i+1])*-1
                        i += 1
                    else:
                        value = int(l[i])
                    i += 2
                    if value:
                        x.week = value
                        x.weekday = (int(l[i])-1) % 7
                    else:
                        x.day = int(l[i])
                    i += 2
                    x.time = int(l[i])
                    i += 2
                if i < len_l:
                    if l[i] in ('-', '+'):
                        signal = (-1, 1)[l[i] == "+"]
                        i += 1
                    else:
                        signal = 1
                    res.dstoffset = (res.stdoffset+int(l[i]))*signal
            elif (l.count(',') == 2 and l[i:].count('/') <= 2 and
                  not [y for x in l[i:] if x not in (',', '/', 'J', 'M',
                                                     '.', '-', ':')
                       for y in x if y not in "0123456789"]):
                for x in (res.start, res.end):
                    if l[i] == 'J':
                        # non-leap year day (1 based)
                        i += 1
                        x.jyday = int(l[i])
                    elif l[i] == 'M':
                        # month[-.]week[-.]weekday
                        i += 1
                        x.month = int(l[i])
                        i += 1
                        assert l[i] in ('-', '.')
                        i += 1
                        x.week = int(l[i])
                        if x.week == 5:
                            x.week = -1
                        i += 1
                        assert l[i] in ('-', '.')
                        i += 1
                        x.weekday = (int(l[i])-1) % 7
                    else:
                        # year day (zero based)
                        x.yday = int(l[i])+1

                    i += 1

                    if i < len_l and l[i] == '/':
                        i += 1
                        # start time
                        len_li = len(l[i])
                        if len_li == 4:
                            # -0300
                            x.time = (int(l[i][:2])*3600+int(l[i][2:])*60)
                        elif i+1 < len_l and l[i+1] == ':':
                            # -03:00
                            x.time = int(l[i])*3600+int(l[i+2])*60
                            i += 2
                            if i+1 < len_l and l[i+1] == ':':
                                i += 2
                                x.time += int(l[i])
                        elif len_li <= 2:
                            # -[0]3
                            x.time = (int(l[i][:2])*3600)
                        else:
                            return None
                        i += 1

                    assert i == len_l or l[i] == ','

                    i += 1

                assert i >= len_l

        except (IndexError, ValueError, AssertionError):
            return None

        return res