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Allow restricting results to descendants of a particular tag

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This commit is contained in:
Kovid Goyal 2015-02-21 10:56:24 +05:30
parent e7caf265c1
commit bd3b162d7a
1 changed files with 9 additions and 3 deletions
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12
src/css_selectors/select.py
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@ -156,13 +156,19 @@ class Select(object):
return ascii_lower(x.rpartition('}')[2])
self.map_tag_name = map_tag_name
def __call__(self, selector):
'Return an iterator over all matching tags, in document order.'
def __call__(self, selector, root=None):
''' Return an iterator over all matching tags, in document order.
Normally, all matching tags in the document are returned, is you
specify root, then only tags that are root or descendants of root are
returned. Note that this can be very expensive if root has a lot of
descendants. '''
seen = set()
if root is not None:
root = frozenset(self.itertag(root))
for selector in get_parsed_selector(selector):
parsed_selector = selector.parsed_tree
for item in self.iterparsedselector(parsed_selector):
if item not in seen:
if item not in seen and (root is None or item in root):
yield item
seen.add(item)