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# Copyright (c) 2012 testtools developers. See LICENSE for details.
"""Tag support."""
class TagContext(object):
"""A tag context."""
def __init__(self, parent=None):
"""Create a new TagContext.
:param parent: If provided, uses this as the parent context. Any tags
that are current on the parent at the time of construction are
current in this context.
"""
self.parent = parent
self._tags = set()
if parent:
self._tags.update(parent.get_current_tags())
def get_current_tags(self):
"""Return any current tags."""
return set(self._tags)
def change_tags(self, new_tags, gone_tags):
"""Change the tags on this context.
:param new_tags: A set of tags to add to this context.
:param gone_tags: A set of tags to remove from this context.
:return: The tags now current on this context.
"""
self._tags.update(new_tags)
self._tags.difference_update(gone_tags)
return self.get_current_tags()
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