from __future__ import absolute_import, division, unicode_literals
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from . import base
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from collections import OrderedDict
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def _attr_key(attr):
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"""Return an appropriate key for an attribute for sorting
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Attributes have a namespace that can be either ``None`` or a string. We
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can't compare the two because they're different types, so we convert
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``None`` to an empty string first.
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"""
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return (attr[0][0] or ''), attr[0][1]
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class Filter(base.Filter):
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"""Alphabetizes attributes for elements"""
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def __iter__(self):
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for token in base.Filter.__iter__(self):
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if token["type"] in ("StartTag", "EmptyTag"):
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attrs = OrderedDict()
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for name, value in sorted(token["data"].items(),
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key=_attr_key):
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attrs[name] = value
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token["data"] = attrs
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yield token
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