def _parse_rfc()

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

• 111 lines of code
• 37 McCabe index (conditional complexity)

    def _parse_rfc(self, s):
        lines = s.splitlines()
        if not lines:
            raise ValueError("empty string")

        # Unfold
        i = 0
        while i < len(lines):
            line = lines[i].rstrip()
            if not line:
                del lines[i]
            elif i > 0 and line[0] == " ":
                lines[i-1] += line[1:]
                del lines[i]
            else:
                i += 1

        tzid = None
        comps = []
        invtz = False
        comptype = None
        for line in lines:
            if not line:
                continue
            name, value = line.split(':', 1)
            parms = name.split(';')
            if not parms:
                raise ValueError("empty property name")
            name = parms[0].upper()
            parms = parms[1:]
            if invtz:
                if name == "BEGIN":
                    if value in ("STANDARD", "DAYLIGHT"):
                        # Process component
                        pass
                    else:
                        raise ValueError("unknown component: "+value)
                    comptype = value
                    founddtstart = False
                    tzoffsetfrom = None
                    tzoffsetto = None
                    rrulelines = []
                    tzname = None
                elif name == "END":
                    if value == "VTIMEZONE":
                        if comptype:
                            raise ValueError("component not closed: "+comptype)
                        if not tzid:
                            raise ValueError("mandatory TZID not found")
                        if not comps:
                            raise ValueError(
                                "at least one component is needed")
                        # Process vtimezone
                        self._vtz[tzid] = _tzicalvtz(tzid, comps)
                        invtz = False
                    elif value == comptype:
                        if not founddtstart:
                            raise ValueError("mandatory DTSTART not found")
                        if tzoffsetfrom is None:
                            raise ValueError(
                                "mandatory TZOFFSETFROM not found")
                        if tzoffsetto is None:
                            raise ValueError(
                                "mandatory TZOFFSETFROM not found")
                        # Process component
                        rr = None
                        if rrulelines:
                            rr = rrule.rrulestr("\n".join(rrulelines),
                                                compatible=True,
                                                ignoretz=True,
                                                cache=True)
                        comp = _tzicalvtzcomp(tzoffsetfrom, tzoffsetto,
                                              (comptype == "DAYLIGHT"),
                                              tzname, rr)
                        comps.append(comp)
                        comptype = None
                    else:
                        raise ValueError("invalid component end: "+value)
                elif comptype:
                    if name == "DTSTART":
                        rrulelines.append(line)
                        founddtstart = True
                    elif name in ("RRULE", "RDATE", "EXRULE", "EXDATE"):
                        rrulelines.append(line)
                    elif name == "TZOFFSETFROM":
                        if parms:
                            raise ValueError(
                                "unsupported %s parm: %s " % (name, parms[0]))
                        tzoffsetfrom = self._parse_offset(value)
                    elif name == "TZOFFSETTO":
                        if parms:
                            raise ValueError(
                                "unsupported TZOFFSETTO parm: "+parms[0])
                        tzoffsetto = self._parse_offset(value)
                    elif name == "TZNAME":
                        if parms:
                            raise ValueError(
                                "unsupported TZNAME parm: "+parms[0])
                        tzname = value
                    elif name == "COMMENT":
                        pass
                    else:
                        raise ValueError("unsupported property: "+name)
                else:
                    if name == "TZID":
                        if parms:
                            raise ValueError(
                                "unsupported TZID parm: "+parms[0])
                        tzid = value
                    elif name in ("TZURL", "LAST-MODIFIED", "COMMENT"):
                        pass
                    else:
                        raise ValueError("unsupported property: "+name)
            elif name == "BEGIN" and value == "VTIMEZONE":
                tzid = None
                comps = []
                invtz = True