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if len(self._addresses) < 2:
# there can't be a tag boundary if there's only 1 or 0 characters
return frozenset()
# creating 'parent_sets' mapping, where the first item in tuple
# is the address of character and the second is set
# of character's parent HTML elements
parent_sets = []
# meanwhile we are creatingalso a set of common parents so we can
# put them away later on (we're not interested in them as
# they're only some global wrappers)
common_parents = set()
for addr in self._addresses:
parents = set()
if addr.attr == 'text':
parents.add(addr.element)
parents.update(addr.element.iterancestors())
parent_sets.append((addr, parents))
if not common_parents:
common_parents = parents
else:
common_parents &= parents
# constructing final set of involved tags
involved_tags = set()
prev_addr = None
for addr, parents in parent_sets:
parents = parents - common_parents
involved_tags.update(p.tag for p in parents)
# hidden tags - sometimes there are tags without text which
# can hide between characters, but they actually break textflow
is_tail_of_hidden = (
prev_addr and
addr.attr == 'tail' and
prev_addr.element != addr.element
)
if is_tail_of_hidden:
involved_tags.add(addr.element)
prev_addr = addr
return frozenset(involved_tags)"
4646,"def _parse(self, html):
""""""Parse given string as HTML and return it's etree representation.""""""
if self._has_body_re.search(html):
tree = lxml.html.document_fromstring(html).find('.//body')
self.has_body = True
else:
tree = lxml.html.fragment_fromstring(html,
create_parent=self._root_tag)
if tree.tag != self._root_tag:
# ensure the root element exists even if not really needed,
# so the tree has always the same structure
root = lxml.html.HtmlElement()
root.tag = self._root_tag
root.append(tree)
return root
return tree"
4647,"def _iter_texts(self, tree):
""""""Iterates over texts in given HTML tree.""""""
skip = (
not isinstance(tree, lxml.html.HtmlElement) # comments, etc.
or tree.tag in self.skipped_tags
)
if not skip:
if tree.text:
yield Text(tree.text, tree, 'text')
for child in tree:
for text in self._iter_texts(child):
yield text
if tree.tail:
yield Text(tree.tail, tree, 'tail')"
4648,"def _analyze_tree(self, tree):
""""""Analyze given tree and create mapping of indexes to character
addresses.
""""""
addresses = []
for text in self._iter_texts(tree):
for i, char in enumerate(text.content):
if char in whitespace:
char = ' '
addresses.append(CharAddress(char, text.element, text.attr, i))
# remove leading and trailing whitespace
while addresses and addresses[0].char == ' ':
del addresses[0]
while addresses and addresses[-1].char == ' ':
del addresses[-1]
return addresses"
4649,"def _validate_index(self, index):
""""""Validates given index, eventually raises errors.""""""
if isinstance(index, slice):
if index.step and index.step != 1: