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

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# This module should only be imported using "import *".

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#

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# The following names are defined:

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#

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# NodeList -- lightest possible NodeList implementation

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#

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# EmptyNodeList -- lightest possible NodeList that is guaranteed to

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# remain empty (immutable)

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#

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# StringTypes -- tuple of defined string types

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#

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# defproperty -- function used in conjunction with GetattrMagic;

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# using these together is needed to make them work

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# as efficiently as possible in both Python 2.2+

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# and older versions. For example:

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#

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# class MyClass(GetattrMagic):

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# def _get_myattr(self):

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# return something

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#

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# defproperty(MyClass, "myattr",

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# "return some value")

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#

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# For Python 2.2 and newer, this will construct a

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# property object on the class, which avoids

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# needing to override __getattr__(). It will only

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# work for read-only attributes.

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#

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# For older versions of Python, inheriting from

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# GetattrMagic will use the traditional

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# __getattr__() hackery to achieve the same effect,

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# but less efficiently.

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#

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# defproperty() should be used for each version of

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# the relevant _get_<property>() function.

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

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import xml.dom

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try:

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unicode

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except NameError:

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StringTypes = type(''),

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else:

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StringTypes = type(''), type(unicode(''))

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class NodeList(list):

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__slots__ = ()

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def item(self, index):

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if 0 <= index < len(self):

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return self[index]

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def _get_length(self):

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return len(self)

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def _set_length(self, value):

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raise xml.dom.NoModificationAllowedErr(

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"attempt to modify read-only attribute 'length'")

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length = property(_get_length, _set_length,

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doc="The number of nodes in the NodeList.")

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# For backward compatibility

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def __setstate__(self, state):

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if state is None:

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state = []

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self[:] = state

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class EmptyNodeList(tuple):

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__slots__ = ()

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def __add__(self, other):

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NL = NodeList()

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NL.extend(other)

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return NL

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def __radd__(self, other):

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NL = NodeList()

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NL.extend(other)

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return NL

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def item(self, index):

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return None

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def _get_length(self):

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return 0

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def _set_length(self, value):

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raise xml.dom.NoModificationAllowedErr(

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"attempt to modify read-only attribute 'length'")

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length = property(_get_length, _set_length,

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doc="The number of nodes in the NodeList.")

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def defproperty(klass, name, doc):

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get = getattr(klass, ("_get_" + name)).im_func

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def set(self, value, name=name):

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raise xml.dom.NoModificationAllowedErr(

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"attempt to modify read-only attribute " + repr(name))

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assert not hasattr(klass, "_set_" + name), \

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"expected not to find _set_" + name

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prop = property(get, set, doc=doc)

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setattr(klass, name, prop)

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