Created on 2010-06-03 11:14 by mnot, last changed 2010-12-23 00:59 by terry.reedy.
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| File name | Uploaded | Description | Edit | |
| testcase_8885.py | mnot, 2010-06-11 01:48 | test case | ||
| Messages (8) | |||
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| msg106938 - (view) | Author: Mark Nottingham (mnot) | Date: 2010-06-03 11:14 | |
In markupbase.py's ParserBase.parse_declaration, an unexpected character is caught like this:
else:
self.error(
"unexpected %r char in declaration" % rawdata[j])
However, the position (j) isn't updated, which means that error() will be called again once it returns.
For example, this declaration:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" http://www.w3.org/TR/html4/loose.dtd>
(which I think is generated by MS Office) will trigger this behaviour.
Two possible resolutions:
1) increment J and try the next character in this case
2) document that error() is not recoverable; i.e., it MUST raise an exception.
My preference is strongly for #1 (as HTML parsing should be forgiving, and HTMLParser is based upon markerbase).
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| msg106996 - (view) | Author: Mark Nottingham (mnot) | Date: 2010-06-03 22:39 | |
Just to be clear -- if error() returns, it will cause an infinite loop. |
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| msg107109 - (view) | Author: Terry J. Reedy (terry.reedy) *  |
Date: 2010-06-04 23:11 | |
Neither markerbase nor markupbase are in the list of 2.6 stdlib modules at http://docs.python.org/modindex.html even with all packages [+] listings expanded to [-]. So I have to guess this is a third party module. If so, please close and report to *its* authors, not here. |
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| msg107114 - (view) | Author: Mark Nottingham (mnot) | Date: 2010-06-05 00:18 | |
http://svn.python.org/view/python/trunk/Lib/markupbase.py?view=log |
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| msg107457 - (view) | Author: R. David Murray (r.david.murray) * |
Date: 2010-06-10 12:02 | |
"This module is used as a foundation for the HTMLParser and sgmllib modules (indirectly, for htmllib as well). It has no documented public API and should not be used directly." So, #2 is not relevant unless you are talking about a docstring update or comment in ParserBase. Do you have a test case using one of the consumer modules that demonstrates a bug? markupbase has no test suite of its own (which probably should be fixed someday :) |
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| msg107518 - (view) | Author: Mark Nottingham (mnot) | Date: 2010-06-11 01:45 | |
I'm using it from HTMLParser; try to parse a document with the DTD given when error is something like:
def error(self, msg):
self.errors += 1
and it will loop.
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| msg107519 - (view) | Author: Mark Nottingham (mnot) | Date: 2010-06-11 01:48 | |
Attaching test case. |
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| msg124525 - (view) | Author: Terry J. Reedy (terry.reedy) * |
Date: 2010-12-23 00:59 | |
I verified the looping behavior of the testcase in both 2.7.1 and, with minor mods, 3.1.3 and 3.2b1, so this is a valid issue.
The HTMLParcer docs (2.7, 3.2) do not mention the .error method. The default is
def error(self, message):
raise HTMLParseError(message, self.getpos())
If this is *not* intended to be part of the api and over-ridden, the name should be changed to ._error and .error deprecated. If it is, it should be documented.
I think the self.error call should be followed either by j+=1 so parsing continues with the next char or by a raise statememt so it is definitely stopped.
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2010-12-23 00:59:27 | terry.reedy | set | nosy:
terry.reedy, mnot, eric.araujo, r.david.murray messages: + msg124525 versions: + Python 3.1, Python 3.2 |
| 2010-12-22 08:54:56 | eric.araujo | set | nosy:
+ eric.araujo title: markerbase declaration errors aren't recoverable -> markupbase declaration errors aren't recoverable versions: + Python 2.7, - Python 2.6 resolution: invalid -> stage: needs patch |
| 2010-06-11 01:48:58 | mnot | set | files:
+ testcase_8885.py messages: + msg107519 |
| 2010-06-11 01:45:45 | mnot | set | messages: + msg107518 |
| 2010-06-10 12:02:41 | r.david.murray | set | nosy:
+ r.david.murray messages: + msg107457 |
| 2010-06-05 00:18:15 | mnot | set | status: pending -> open messages: + msg107114 |
| 2010-06-04 23:11:27 | terry.reedy | set | status: open -> pending nosy: + terry.reedy messages: + msg107109 resolution: invalid |
| 2010-06-03 22:39:45 | mnot | set | messages: + msg106996 |
| 2010-06-03 11:14:09 | mnot | create | |