Hi,
I'd like to verify some (x)html / / html5 / xml documents from a server.
These documents have a very limited number of different doc types / DTDs.
So what I would like to do is to build a small DTD cache and some code,
that would avoid searching the DTDs over and over from the net.
What would be the best way to do this?
I guess, that
the fields od en ElementTre, that I have to look at are
docinfo.public_id
docinfo.system_uri
There's also mentioning af a catalogue, but I don't know how to
use a catalog and how to know what is inside my catalogue
and what isn't.
Below a non working skeleto (first shot):
---------------------------------------------
Would this be the right way??
### ufnctions with '???' are not implemented / are the ones
### where I don't know whether they exist alreday.
import os
import urllib
from lxml import etree
cache_dir = os.path.join(os.environ['HOME'], ''.my_dtd_cache')
def get_from_cache(docinfo):
""" the function which I'd like to implement most efficiently """
fpi = docinfo.public_id
uri = docinfo.system_uri
dtd = ???get_from_dtd_cache(fpi, uri)
if dtd is not None:
return dtd
# how can I check what is in my 'catalogue'
if ???dtd_in_catalogue(??):
return ???get_dtd_from_catalogue???
dtd_rdr = urllib.urlopen(uri)
dtd_filename = ???create_cache_filename(docinfo)
(fname, _headers) = urllib.urlretrieve(uri, dtd_filename)
return etree.DTD(fname)
def check_doc_cached(filename):
""" function, which should report errors
if a doc doesn't validate.
"""
doc = etree.parse(filename)
dtd = get_from_cache(doc.docinfo)
rslt = dtd.validate(doc)
if not rlst:
print "validate error:"
print(dtd.error_log.filter_from_errors()[0])
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