source: trunk/essentials/dev-lang/python/Lib/xml/dom/minicompat.py@ 3226

"""Python version compatibility support for minidom."""

# This module should only be imported using "import *".
#
# The following names are defined:
#
#   NodeList      -- lightest possible NodeList implementation
#
#   EmptyNodeList -- lightest possible NodeList that is guarateed to
#                    remain empty (immutable)
#
#   StringTypes   -- tuple of defined string types
#
#   defproperty   -- function used in conjunction with GetattrMagic;
#                    using these together is needed to make them work
#                    as efficiently as possible in both Python 2.2+
#                    and older versions.  For example:
#
#                        class MyClass(GetattrMagic):
#                            def _get_myattr(self):
#                                return something
#
#                        defproperty(MyClass, "myattr",
#                                    "return some value")
#
#                    For Python 2.2 and newer, this will construct a
#                    property object on the class, which avoids
#                    needing to override __getattr__().  It will only
#                    work for read-only attributes.
#
#                    For older versions of Python, inheriting from
#                    GetattrMagic will use the traditional
#                    __getattr__() hackery to achieve the same effect,
#                    but less efficiently.
#
#                    defproperty() should be used for each version of
#                    the relevant _get_<property>() function.

__all__ = ["NodeList", "EmptyNodeList", "StringTypes", "defproperty"]

import xml.dom

try:
    unicode
except NameError:
    StringTypes = type(''),
else:
    StringTypes = type(''), type(unicode(''))


class NodeList(list):
    __slots__ = ()

    def item(self, index):
        if 0 <= index < len(self):
            return self[index]

    def _get_length(self):
        return len(self)