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from django.core.exceptions import ImproperlyConfigured
from django.utils.encoding import smart_str
from django.utils.functional import cached_property
from compressor.exceptions import ParserError
from compressor.parser import ParserBase
class LxmlParser(ParserBase):
"""
LxmlParser will use `lxml.html` parser to parse rendered contents of
{% compress %} tag.
"""
def __init__(self, content):
try:
from lxml.html import fromstring
from lxml.etree import tostring
except ImportError as err:
raise ImproperlyConfigured("Error while importing lxml: %s" % err)
except Exception as err:
raise ParserError("Error while initializing parser: %s" % err)
self.fromstring = fromstring
self.tostring = tostring
super().__init__(content)
@cached_property
def tree(self):
"""
Document tree.
"""
content = "<root>%s</root>" % self.content
tree = self.fromstring(content)
self.tostring(tree, encoding=str)
return tree
def css_elems(self):
return self.tree.xpath(
'//link[re:test(@rel, "^stylesheet$", "i")]|style',
namespaces={"re": "http://exslt.org/regular-expressions"},
)
def js_elems(self):
return self.tree.findall("script")
def elem_attribs(self, elem):
return elem.attrib
def elem_content(self, elem):
return smart_str(elem.text)
def elem_name(self, elem):
return elem.tag
def elem_str(self, elem):
return smart_str(self.tostring(elem, method="html", encoding=str))
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