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"""
XPath selectors based on lxml
"""
import warnings
from parsel import Selector as _ParselSelector
from scrapy.utils.trackref import object_ref
from scrapy.utils.python import to_bytes
from scrapy.http import HtmlResponse, XmlResponse
from scrapy.utils.decorators import deprecated
from scrapy.exceptions import ScrapyDeprecationWarning
__all__ = ['Selector', 'SelectorList']
def _st(response, st):
if st is None:
return 'xml' if isinstance(response, XmlResponse) else 'html'
return st
def _response_from_text(text, st):
rt = XmlResponse if st == 'xml' else HtmlResponse
return rt(url='about:blank', encoding='utf-8',
body=to_bytes(text, 'utf-8'))
class SelectorList(_ParselSelector.selectorlist_cls, object_ref):
@deprecated(use_instead='.extract()')
def extract_unquoted(self):
return [x.extract_unquoted() for x in self]
@deprecated(use_instead='.xpath()')
def x(self, xpath):
return self.select(xpath)
@deprecated(use_instead='.xpath()')
def select(self, xpath):
return self.xpath(xpath)
class Selector(_ParselSelector, object_ref):
__slots__ = ['response']
selectorlist_cls = SelectorList
def __init__(self, response=None, text=None, type=None, root=None, _root=None, **kwargs):
if not(response is None or text is None):
raise ValueError('%s.__init__() received both response and text'
% self.__class__.__name__)
st = _st(response, type or self._default_type)
if _root is not None:
warnings.warn("Argument `_root` is deprecated, use `root` instead",
ScrapyDeprecationWarning, stacklevel=2)
if root is None:
root = _root
else:
warnings.warn("Ignoring deprecated `_root` argument, using provided `root`")
if text is not None:
response = _response_from_text(text, st)
if response is not None:
text = response.text
kwargs.setdefault('base_url', response.url)
self.response = response
super(Selector, self).__init__(text=text, type=st, root=root, **kwargs)
# Deprecated api
@property
def _root(self):
warnings.warn("Attribute `_root` is deprecated, use `root` instead",
ScrapyDeprecationWarning, stacklevel=2)
return self.root
@deprecated(use_instead='.xpath()')
def select(self, xpath):
return self.xpath(xpath)
@deprecated(use_instead='.extract()')
def extract_unquoted(self):
return self.extract()
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