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b02754adec
`rendered_content` in historical messages may be empty; examining the history of them may thus require diff'ing two empty strings, which itself produces an empty string. Use `lxml.html.fragment_fromstring` to be able to successfully parse these, rather than 500. Part of #19559.
22 lines
596 B
Python
22 lines
596 B
Python
from typing import Optional
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import lxml
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from lxml.html.diff import htmldiff
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def highlight_html_differences(s1: str, s2: str, msg_id: Optional[int] = None) -> str:
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retval = htmldiff(s1, s2)
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fragment = lxml.html.fragment_fromstring(retval, create_parent=True)
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for elem in fragment.cssselect("del"):
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elem.tag = "span"
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elem.set("class", "highlight_text_deleted")
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for elem in fragment.cssselect("ins"):
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elem.tag = "span"
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elem.set("class", "highlight_text_inserted")
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retval = lxml.html.tostring(fragment, encoding="unicode")
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return retval
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