New submission from Waylan Limberg :
When the `close` method of the HtmlParser is called, any cached text data is
generally flushed and passed to a `data` event; except when in `data_mode`.
Specifically, if an unclosed `script` or `style` tag has been encountered, a
call to `close` does not flush the data.
A simple test which demonstrates the issue is attached.
I see that in Lib/html/parser.py#L244-L249 there are two nested if statements
which both check for `not self.cdata_elem`. Obviously, if we got past the first
one, that situation will never exist for the nested one. Somehow this block of
code needs a branch for when `self.cdata_elem` is True.
I should note that the input is invalid HTML. However, the existing behavior
results in data loss. Within any other unclosed tag (other than `script` or
`style`) any data is still flushed and passed to a `data` event. I would expect
the same behavior here. Although, the data escaping behavior should perhaps be
applied as it is with data within properly closed tags.
--
components: Library (Lib)
files: test_html.py
messages: 378359
nosy: waylan
priority: normal
severity: normal
status: open
title: htmlparser unclosed script tag causes data loss
type: behavior
versions: Python 3.10, Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python
3.9
Added file: https://bugs.python.org/file49505/test_html.py
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