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from django.utils import six
from django.utils.functional import LazyObject
from django.utils.importlib import import_module
# support legacy parser module usage
from compressor.parser.base import ParserBase # noqa
from compressor.parser.lxml import LxmlParser
from compressor.parser.default_htmlparser import DefaultHtmlParser as HtmlParser
from compressor.parser.beautifulsoup import BeautifulSoupParser # noqa
from compressor.parser.html5lib import Html5LibParser # noqa
class AutoSelectParser(LazyObject):
options = (
# TODO: make lxml.html parser first again
(six.moves.html_parser.__name__, HtmlParser), # fast and part of the Python stdlib
('lxml.html', LxmlParser), # lxml, extremely fast
)
def __init__(self, content):
self._wrapped = None
self._setup(content)
def __getattr__(self, name):
return getattr(self._wrapped, name)
def _setup(self, content):
for dependency, parser in self.options:
try:
import_module(dependency)
self._wrapped = parser(content)
break
except ImportError:
continue
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