ulist.py :  » Mobile » pyscard » pyscard-1.6.10 » smartcard » Python Open Source

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Python Open Source » Mobile » pyscard 
pyscard » pyscard 1.6.10 » smartcard » ulist.py
"""ulist is a subclass of list where items cannot appear twice in the list.

[1,2,2,3,3,4] is a valid list, whereas in ulist we can only have [1,2,3,4].

__author__ = "gemalto http://www.gemalto.com"

Copyright 2001-2010 gemalto
Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com

This file is part of pyscard.

pyscard is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

pyscard is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with pyscard; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
"""

class ulist(list):
    """ulist ensures that all items are unique and provides an __onadditem__
    hook to perform custom action in subclasses."""

    #
    # override list methods
    #
    def __init__(self, initlist=None):
        if initlist is not None and initlist!=[]:
            list.__init__( self, [initlist[0]] )
            for item in initlist[1:]:
                if not list.__contains__( self, item ):
                    list.append( self, item )
        else:
            list.__init__( self, initlist )

    def __add__(self, other):
        newother = self.__remove_duplicates( other )
        self.__appendother__( newother )
        return self.__class__( list(self)+list(newother) )

    def __iadd__(self, other):
        newother = self.__remove_duplicates( other )
        self.__appendother__( newother )
        list.__iadd__( self, newother )
        return self

    def __radd__(self, other):
        newother = self.__remove_duplicates( other )
        return list.__add__( self, newother )

    def append(self, item):
        if not list.__contains__( self, item ):
            list.append( self, item )
            self.__onadditem__( item )

    def insert(self, i, item):
        if not list.__contains__( self, item ):
            list.insert( self, i, item )
            self.__onadditem__( item )

    def pop(self, i=-1):
        item = list.pop( self, i )
        self.__onremoveitem__( item )
        return item

    def remove(self, item):
        list.remove( self, item )
        self.__onremoveitem__( item )

    #
    # non list methods
    #
    def __remove_duplicates( self, _other ):
        """Remove from other items already in list."""
        if     not isinstance( _other, type(self) ) \
           and not isinstance( _other, type(list)) \
           and not isinstance( _other, type([])):
            other=[_other]
        else:
            other=list(_other)


        # remove items already in self
        newother=[]
        for i in range(0, len(other) ):
            item = other.pop(0)
            if not list.__contains__( self, item ):
                newother.append( item )

        # remove duplicate items in other
        other=[]
        if newother!=[]:
            other.append(newother[0])
            for i in range( 1, len( newother ) ):
                item = newother.pop()
                if not other.__contains__( item ):
                    other.append( item )
        return other

    def __appendother__( self, other ):
        """Append other to object."""
        for item in other:
            self.__onadditem__( item )

    def __onadditem__( self, item ):
        """Called for each item added. Override in subclasses for adding custom action."""
        pass

    def __onremoveitem__( self, item ):
        """Called for each item removed. Override in subclasses for adding custom action."""
        pass
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