def from_response(
cls: Type[FormRequestTypeVar],
response: TextResponse,
formname: Optional[str] = None,
formid: Optional[str] = None,
formnumber: Optional[int] = 0,
formdata: FormdataType = None,
clickdata: Optional[dict] = None,
dont_click: bool = False,
formxpath: Optional[str] = None,
formcss: Optional[str] = None,
**kwargs,
) -> FormRequestTypeVar:
kwargs.setdefault('encoding', response.encoding)
if formcss is not None:
from parsel.csstranslator import HTMLTranslator
formxpath = HTMLTranslator().css_to_xpath(formcss)
form = _get_form(response, formname, formid, formnumber, formxpath)
formdata = _get_inputs(form, formdata, dont_click, clickdata)
url = _get_form_url(form, kwargs.pop('url', None))
method = kwargs.pop('method', form.method)
if method is not None:
method = method.upper()
if method not in cls.valid_form_methods:
method = 'GET'
return cls(url=url, method=method, formdata=formdata, **kwargs)
def from_response(
cls,
response,
formname=None,
formid=None,
formnumber=0,
formdata=None,
clickdata=None,
dont_click=False,
formxpath=None,
formcss=None,
**kwargs,
):
kwargs.setdefault("encoding", response.encoding)
if formcss is not None:
from parsel.csstranslator import HTMLTranslator
formxpath = HTMLTranslator().css_to_xpath(formcss)
form = _get_form(response, formname, formid, formnumber, formxpath)
formdata = _get_inputs(form, formdata, dont_click, clickdata, response)
url = _get_form_url(form, kwargs.pop("url", None))
method = kwargs.pop("method", form.method)
if method is not None:
method = method.upper()
if method not in cls.valid_form_methods:
method = "GET"
return cls(url=url, method=method, formdata=formdata, **kwargs)
def from_response(cls,
response,
formname=None,
formid=None,
formnumber=0,
formdata=None,
clickdata=None,
dont_click=False,
formxpath=None,
formcss=None,
**kwargs):
kwargs.setdefault('encoding', response.encoding)
if formcss is not None:
from parsel.csstranslator import HTMLTranslator
formxpath = HTMLTranslator().css_to_xpath(formcss)
form = _get_form(response, formname, formid, formnumber, formxpath)
formdata = _get_inputs(form, formdata, dont_click, clickdata, response)
url = _get_form_url(form, kwargs.pop('url', None))
if form is None: #todo:mmmm
method = kwargs.pop('method', 'POST')
else:
method = kwargs.pop('method', form.method)
return cls(url=url, method=method, formdata=formdata, **kwargs)
def click(self, query):
"""Clicks on an element specified by query, and reloads the pages source into to the body"""
try:
xpath_query = HTMLTranslator().css_to_xpath(query)
except SelectorSyntaxError:
xpath_query = query
self.interact.find_element_by_xpath(xpath_query).click()
if self.request.wait_until:
WebDriverWait(self.interact, self.request.wait_time).until(
self.request.wait_until)
return self.replace(url=self.interact.current_url,
body=str.encode(self.interact.page_source))
class FilteringLinkExtractor(object):
_csstranslator = HTMLTranslator()
def __init__(self, link_extractor, allow, deny, allow_domains,
deny_domains, restrict_xpaths, canonicalize, deny_extensions,
restrict_css):
self.link_extractor = link_extractor
self.allow_res = [
x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(allow)
]
self.deny_res = [
x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(deny)
]
self.allow_domains = set(arg_to_iter(allow_domains))
self.deny_domains = set(arg_to_iter(deny_domains))
self.restrict_xpaths = tuple(arg_to_iter(restrict_xpaths))
self.restrict_xpaths += tuple(
map(self._csstranslator.css_to_xpath, arg_to_iter(restrict_css)))
self.canonicalize = canonicalize
if deny_extensions is None:
deny_extensions = IGNORED_EXTENSIONS
self.deny_extensions = {'.' + e for e in arg_to_iter(deny_extensions)}
def _link_allowed(self, link):
if not _is_valid_url(link.url):
return False
if self.allow_res and not _matches(link.url, self.allow_res):
return False
if self.deny_res and _matches(link.url, self.deny_res):
return False
parsed_url = urlparse(link.url)
if self.allow_domains and not url_is_from_any_domain(
parsed_url, self.allow_domains):
return False
if self.deny_domains and url_is_from_any_domain(
parsed_url, self.deny_domains):
return False
if self.deny_extensions and url_has_any_extension(
parsed_url, self.deny_extensions):
return False
return True
def matches(self, url):
if self.allow_domains and not url_is_from_any_domain(
url, self.allow_domains):
return False
if self.deny_domains and url_is_from_any_domain(
url, self.deny_domains):
return False
allowed = (regex.search(url)
for regex in self.allow_res) if self.allow_res else [True]
denied = (regex.search(url)
for regex in self.deny_res) if self.deny_res else []
return any(allowed) and not any(denied)
def _process_links(self, links):
links = [x for x in links if self._link_allowed(x)]
if self.canonicalize:
for link in links:
link.url = canonicalize_url(link.url)
links = self.link_extractor._process_links(links)
return links
def _extract_links(self, *args, **kwargs):
return self.link_extractor._extract_links(*args, **kwargs)
class CannotRemoveElementWithoutParent(Exception):
pass
class SafeXMLParser(etree.XMLParser):
def __init__(self, *args, **kwargs):
kwargs.setdefault('resolve_entities', False)
super(SafeXMLParser, self).__init__(*args, **kwargs)
_ctgroup = {
'html': {
'_parser': html.HTMLParser,
'_csstranslator': HTMLTranslator(),
'_tostring_method': 'html'
},
'xml': {
'_parser': SafeXMLParser,
'_csstranslator': GenericTranslator(),
'_tostring_method': 'xml'
},
}
def _st(st):
if st is None:
return 'html'
elif st in _ctgroup:
return st
class FilteringLinkExtractor(object):
_csstranslator = HTMLTranslator()
def __new__(cls, *args, **kwargs):
from scrapy.linkextractors.lxmlhtml import LxmlLinkExtractor
if (issubclass(cls, FilteringLinkExtractor) and
not issubclass(cls, LxmlLinkExtractor)):
warn('scrapy.linkextractors.FilteringLinkExtractor is deprecated, '
'please use scrapy.linkextractors.LinkExtractor instead',
ScrapyDeprecationWarning, stacklevel=2)
return super(FilteringLinkExtractor, cls).__new__(cls)
def __init__(self, link_extractor, allow, deny, allow_domains, deny_domains,
restrict_xpaths, canonicalize, deny_extensions, restrict_css, restrict_text):
self.link_extractor = link_extractor
self.allow_res = [x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(allow)]
self.deny_res = [x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(deny)]
self.allow_domains = set(arg_to_iter(allow_domains))
self.deny_domains = set(arg_to_iter(deny_domains))
self.restrict_xpaths = tuple(arg_to_iter(restrict_xpaths))
self.restrict_xpaths += tuple(map(self._csstranslator.css_to_xpath,
arg_to_iter(restrict_css)))
self.canonicalize = canonicalize
if deny_extensions is None:
deny_extensions = IGNORED_EXTENSIONS
self.deny_extensions = {'.' + e for e in arg_to_iter(deny_extensions)}
self.restrict_text = [x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(restrict_text)]
def _link_allowed(self, link):
if not _is_valid_url(link.url):
return False
if self.allow_res and not _matches(link.url, self.allow_res):
return False
if self.deny_res and _matches(link.url, self.deny_res):
return False
parsed_url = urlparse(link.url)
if self.allow_domains and not url_is_from_any_domain(parsed_url, self.allow_domains):
return False
if self.deny_domains and url_is_from_any_domain(parsed_url, self.deny_domains):
return False
if self.deny_extensions and url_has_any_extension(parsed_url, self.deny_extensions):
return False
if self.restrict_text and not _matches(link.text, self.restrict_text):
return False
return True
def matches(self, url):
if self.allow_domains and not url_is_from_any_domain(url, self.allow_domains):
return False
if self.deny_domains and url_is_from_any_domain(url, self.deny_domains):
return False
allowed = (regex.search(url) for regex in self.allow_res) if self.allow_res else [True]
denied = (regex.search(url) for regex in self.deny_res) if self.deny_res else []
return any(allowed) and not any(denied)
def _process_links(self, links):
links = [x for x in links if self._link_allowed(x)]
if self.canonicalize:
for link in links:
link.url = canonicalize_url(link.url)
links = self.link_extractor._process_links(links)
return links
def _extract_links(self, *args, **kwargs):
return self.link_extractor._extract_links(*args, **kwargs)
class FilteringLinkExtractor:
_csstranslator = HTMLTranslator()
def __new__(cls, *args, **kwargs):
from scrapy.linkextractors.lxmlhtml import LxmlLinkExtractor
if issubclass(cls, FilteringLinkExtractor) and not issubclass(
cls, LxmlLinkExtractor):
warn(
'scrapy.linkextractors.FilteringLinkExtractor is deprecated, '
'please use scrapy.linkextractors.LinkExtractor instead',
ScrapyDeprecationWarning,
stacklevel=2)
return super().__new__(cls)
def __init__(self, link_extractor, allow, deny, allow_domains,
deny_domains, restrict_xpaths, canonicalize, deny_extensions,
restrict_css, restrict_text):
self.link_extractor = link_extractor
self.allow_res = [
x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(allow)
] # 如果是正则匹配的 就添加本体 不是的话 用re.compile compile 一下
self.deny_res = [
x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(deny)
] #完全同上
self.allow_domains = set(
arg_to_iter(allow_domains)) #这里 arg_to_iter 就是保证这个对象返回的是一个可迭代对象
self.deny_domains = set(arg_to_iter(deny_domains))
self.restrict_xpaths = tuple(
arg_to_iter(restrict_xpaths)) #好理解 就是将限制的XPATH 转成 tupe形式的
self.restrict_xpaths += tuple(
map(self._csstranslator.css_to_xpath, arg_to_iter(
restrict_css))) #类似上面 用 HTMLTranslator 解析CSS的选择器 将其转化为xpath
self.canonicalize = canonicalize #单词的意思是规范化
if deny_extensions is None:
deny_extensions = IGNORED_EXTENSIONS #不设置的化 基本就拒绝所有了
self.deny_extensions = {'.' + e
for e in arg_to_iter(deny_extensions)
} #自定义的扩展黑名单
self.restrict_text = [
x if isinstance(x, _re_type) else re.compile(x)
for x in arg_to_iter(restrict_text)
] # 同self.allow_res
#判断给定的link 是否满足给定参数列表下的情况
def _link_allowed(self, link):
if not _is_valid_url(link.url): #检查 http等前缀
return False
if self.allow_res and not _matches(
link.url, self.allow_res): # 如果有 allow 参数 则判断是否不在 其中
return False
if self.deny_res and _matches(link.url, self.deny_res): #同上 判断是否在deny中
return False
parsed_url = urlparse(link.url) #解析出正确的 url格式的url
if self.allow_domains and not url_is_from_any_domain(
parsed_url, self.allow_domains): #是否不在 allow_domains 中
return False
if self.deny_domains and url_is_from_any_domain(
parsed_url, self.deny_domains): #是否在deny_domains里
return False
if self.deny_extensions and url_has_any_extension(
parsed_url, self.deny_extensions): #是否在忽略扩展名里
return False
if self.restrict_text and not _matches(
link.text, self.restrict_text): #是否在restrict_text里面
return False
return True
# 只判断 allow deny allow_domains deny_domains 的情况 比上一个判断条件少
def matches(self, url):
if self.allow_domains and not url_is_from_any_domain(
url, self.allow_domains):
return False
if self.deny_domains and url_is_from_any_domain(
url, self.deny_domains):
return False
allowed = (regex.search(url)
for regex in self.allow_res) if self.allow_res else [True]
denied = (regex.search(url)
for regex in self.deny_res) if self.deny_res else []
return any(allowed) and not any(denied)
def _process_links(self, links):
links = [x for x in links if self._link_allowed(x)
] #调用self._link_allowed 判断所有给定的link是否符合规则
if self.canonicalize: #如果设置了这个规范化标志 那么调用这个方法
for link in links:
link.url = canonicalize_url(link.url)
links = self.link_extractor._process_links(links)
return links #返回过滤完成的links
def _extract_links(self, *args, **kwargs):
return self.link_extractor._extract_links(*args, **kwargs)