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/usr/lib/python2.7/dist-packages/pycalendar/parameter.py is in python-pycalendar 2.1~svn15020-1.

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##
#    Copyright (c) 2007-2013 Cyrus Daboo. All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
##

"""
ICalendar parameter.

The parameter can consist of one or more values, all string.
"""

from pycalendar import xmldefinitions, xmlutils
from pycalendar.utils import encodeParameterValue
import xml.etree.cElementTree as XML

class Parameter(object):

    def __init__(self, name, value=None):
        self.mName = name
        if value is None:
            self.mValues = []
        elif isinstance(value, basestring):
            self.mValues = [value]
        else:
            self.mValues = value


    def duplicate(self):
        other = Parameter(self.mName)
        other.mValues = self.mValues[:]
        return other


    def __hash__(self):
        return hash((self.mName.upper(), tuple(self.mValues)))


    def __ne__(self, other):
        return not self.__eq__(other)


    def __eq__(self, other):
        if not isinstance(other, Parameter):
            return False
        return self.mName.upper() == other.mName.upper() and self.mValues == other.mValues


    def getName(self):
        return self.mName


    def setName(self, name):
        self.mName = name


    def getFirstValue(self):
        return self.mValues[0]


    def getValues(self):
        return self.mValues


    def setValues(self, values):
        self.mValues = values


    def addValue(self, value):
        self.mValues.append(value)


    def removeValue(self, value):
        self.mValues.remove(value)
        return len(self.mValues)


    def generate(self, os):
        try:
            os.write(self.mName)

            # To support vCard 2.1 syntax we allow parameters without values
            if self.mValues:
                os.write("=")

                first = True
                for s in sorted(self.mValues):
                    if first:
                        first = False
                    else:
                        os.write(",")

                    # Write with quotation if required
                    self.generateValue(os, s)

        except:
            # We ignore errors
            pass


    def generateValue(self, os, str):

        # ^-escaping
        str = encodeParameterValue(str)

        # Look for quoting
        if str.find(":") != -1 or str.find(";") != -1 or str.find(",") != -1:
            os.write("\"%s\"" % (str,))
        else:
            os.write(str)


    def writeXML(self, node, namespace):
        param = XML.SubElement(node, xmlutils.makeTag(namespace, self.getName()))
        for value in self.getValues():
            # TODO: need to figure out proper value types
            text = XML.SubElement(param, xmlutils.makeTag(namespace, xmldefinitions.value_text))
            text.text = value


    def writeJSON(self, jobject):
        jobject[self.getName().lower()] = self.mValues if len(self.mValues) != 1 else self.mValues[0]