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def _freeze_relations(self, relations):
"""Freeze relation."""
if relations:
sel = relations[0]
sel.relations.extend(relations[1:])
return ct.SelectorList([sel.freeze()])
else:
return ct.SelectorList()
sel.nth.append(ct.SelectorNth(1, False, 0, False, True, ct.SelectorList()))
elif pseudo == ':first-of-type':
sel.nth.append(ct.SelectorNth(1, False, 0, True, False, ct.SelectorList()))
elif pseudo == ':last-of-type':
sel.nth.append(ct.SelectorNth(1, False, 0, True, True, ct.SelectorList()))
elif pseudo == ':only-child':
sel.nth.extend(
[
ct.SelectorNth(1, False, 0, False, False, ct.SelectorList()),
ct.SelectorNth(1, False, 0, False, True, ct.SelectorList())
]
)
elif pseudo == ':only-of-type':
sel.nth.extend(
[
ct.SelectorNth(1, False, 0, True, False, ct.SelectorList()),
ct.SelectorNth(1, False, 0, True, True, ct.SelectorList())
]
)
has_selector = True
elif complex_pseudo and pseudo in PSEUDO_COMPLEX_NO_MATCH:
self.parse_selectors(iselector, m.end(0), FLG_PSEUDO | FLG_OPEN)
sel.no_match = True
has_selector = True
elif not complex_pseudo and pseudo in PSEUDO_SIMPLE_NO_MATCH:
sel.no_match = True
has_selector = True
elif pseudo in PSEUDO_SUPPORTED:
raise SelectorSyntaxError(
"Invalid syntax for pseudo class '{}'".format(pseudo),
self.pattern,
m.start(0)
elif pseudo == ":required":
sel.selectors.append(CSS_REQUIRED)
elif pseudo == ":optional":
sel.selectors.append(CSS_OPTIONAL)
elif pseudo == ":read-only":
sel.selectors.append(CSS_READ_ONLY)
elif pseudo == ":read-write":
sel.selectors.append(CSS_READ_WRITE)
elif pseudo == ":in-range":
sel.selectors.append(CSS_IN_RANGE)
elif pseudo == ":out-of-range":
sel.selectors.append(CSS_OUT_OF_RANGE)
elif pseudo == ":placeholder-shown":
sel.selectors.append(CSS_PLACEHOLDER_SHOWN)
elif pseudo == ':first-child':
sel.nth.append(ct.SelectorNth(1, False, 0, False, False, ct.SelectorList()))
elif pseudo == ':last-child':
sel.nth.append(ct.SelectorNth(1, False, 0, False, True, ct.SelectorList()))
elif pseudo == ':first-of-type':
sel.nth.append(ct.SelectorNth(1, False, 0, True, False, ct.SelectorList()))
elif pseudo == ':last-of-type':
sel.nth.append(ct.SelectorNth(1, False, 0, True, True, ct.SelectorList()))
elif pseudo == ':only-child':
sel.nth.extend(
[
ct.SelectorNth(1, False, 0, False, False, ct.SelectorList()),
ct.SelectorNth(1, False, 0, False, True, ct.SelectorList())
]
)
elif pseudo == ':only-of-type':
sel.nth.extend(
[
# Some patterns require additional logic, such as default. We try to make these the
# last pattern, and append the appropriate flag to that selector which communicates
# to the matcher what additional logic is required.
if is_default:
selectors[-1].flags = ct.SEL_DEFAULT
if is_indeterminate:
selectors[-1].flags = ct.SEL_INDETERMINATE
if is_in_range:
selectors[-1].flags = ct.SEL_IN_RANGE
if is_out_of_range:
selectors[-1].flags = ct.SEL_OUT_OF_RANGE
if is_placeholder_shown:
selectors[-1].flags = ct.SEL_PLACEHOLDER_SHOWN
return ct.SelectorList([s.freeze() for s in selectors], is_not, is_html)
Parse custom pseudo class alias.
Compile custom selectors as we need them. When compiling a custom selector,
set it to `None` in the dictionary so we can avoid an infinite loop.
"""
pseudo = util.lower(css_unescape(m.group('name')))
selector = self.custom.get(pseudo)
if selector is None:
raise SelectorSyntaxError(
"Undefined custom selector '{}' found at postion {}".format(pseudo, m.end(0)),
self.pattern,
m.end(0)
)
if not isinstance(selector, ct.SelectorList):
self.custom[pseudo] = None
selector = CSSParser(
selector, custom=self.custom, flags=self.flags
).process_selectors(flags=FLG_PSEUDO)
self.custom[pseudo] = selector
sel.selectors.append(selector)
has_selector = True
return has_selector
else:
# Value matches
pattern = re.compile(r'^%s$' % re.escape(value), flags)
if op.startswith('!'):
# Equivalent to `:not([attr=value])`
inverse = True
if is_type and pattern:
pattern2 = re.compile(pattern.pattern)
# Append the attribute selector
sel_attr = ct.SelectorAttribute(attr, ns, pattern, pattern2)
if inverse:
# If we are using `!=`, we need to nest the pattern under a `:not()`.
sub_sel = _Selector()
sub_sel.attributes.append(sel_attr)
not_list = ct.SelectorList([sub_sel.freeze()], True, False)
sel.selectors.append(not_list)
else:
sel.attributes.append(sel_attr)
has_selector = True
return has_selector