How do I fix wrongly nested / unclosed HTML tags?

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悲&欢浪女 2020-12-01 09:56

I need to sanitize HTML submitted by the user by closing any open tags with correct nesting order. I have been looking for an algorithm or Python code to do this but haven\'

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情话喂你 (楼主)

2020-12-01 10:16

using BeautifulSoup:

from BeautifulSoup import BeautifulSoup
html = "Foo"
soup = BeautifulSoup(html)
print soup.prettify()

gets you

Foo

As far as I know, you can't control putting the

using Tidy:

import tidy
html = "Foo"
print tidy.parseString(html, show_body_only=True)

gets you

Foo

Unfortunately, I know of no way to keep the

tag in the example. Tidy interprets it as an empty paragraph rather than an unclosed one, so doing

print tidy.parseString(html, show_body_only=True, drop_empty_paras=False)

comes out as

Foo

Ultimately, of course, the

tag in your example is redundant, so you might be fine with losing it.

Finally, Tidy can also do indenting:

print tidy.parseString(html, show_body_only=True, indent=True)

becomes

Foo

All of these have their ups and downs, but hopefully one of them is close enough.

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