def assert_node(node, cls=None, xpath="", **kwargs):
if cls:
if isinstance(cls, list):
assert_node(node, cls[0], xpath=xpath, **kwargs)
if cls[1:]:
if isinstance(cls[1], tuple):
assert_node(node, cls[1], xpath=xpath, **kwargs)
else:
assert len(node) == 1, \
'The node%s has %d child nodes, not one' % (xpath, len(node))
assert_node(node[0], cls[1:], xpath=xpath + "[0]", **kwargs)
elif isinstance(cls, tuple):
assert len(node) == len(cls), \
'The node%s has %d child nodes, not %r' % (xpath, len(node), len(cls))
for i, nodecls in enumerate(cls):
path = xpath + "[%d]" % i
assert_node(node[i], nodecls, xpath=path, **kwargs)
elif isinstance(cls, string_types):
assert node == cls, 'The node %r is not %r: %r' % (xpath, cls, node)
else:
assert isinstance(node, cls), \
'The node%s is not subclass of %r: %r' % (xpath, cls, node)
for key, value in kwargs.items():
assert key in node, 'The node%s does not have %r attribute: %r' % (xpath, key, node)
assert node[key] == value, \
'The node%s[%s] is not %r: %r' % (xpath, key, value, node[key])
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