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Pure Python (currently HTML5lib based) HTML5 validator for use in django tests, etc. Works offline, does not use external services.

License: Other

Makefile 1.21% Python 77.62% HTML 21.17%
html5 library python validation-library web-development

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danthedeckie avatar emilstenstrom avatar

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html5validate's Issues

Specify line numbers and give more context on errors

Hi! Thanks for a great little library! I've used it to write a crawler that goes through my whole site on localhost and validates all HTML. Great when there's lots of user generated content that I want to make sure doesn't break my site.

Anyways. I'm not sure how hard this is, but I would really like better error messages. Here's an example from my script:

Checking: http://localhost:8000/js/lazy-loading-asyncronous-javascript/                                        --> Traceback (most recent call last):
  File "commands/crawl.py", line 88, in <module>
    main()
  File "commands/crawl.py", line 77, in main
    print(("VALID" if html5validate.validate(html) is None else "INVALID"))
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5validate.py", line 36, in validate
    dom = PARSER.parse(text)
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 289, in parse
    self._parse(stream, False, None, *args, **kwargs)
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 134, in _parse
    self.mainLoop()
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 241, in mainLoop
    new_token = phase.processStartTag(new_token)
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 472, in processStartTag
    return self.startTagHandler[token["name"]](token)
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 1154, in startTagA
    self.parser.parseError("unexpected-start-tag-implies-end-tag",
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 326, in parseError
    raise ParseError(E[errorcode] % datavars)
html5lib.html5parser.ParseError: Unexpected start tag (a) implies end tag (a).

The checked HTML files has hundreds of links, and just finding which one is missing a </a> is a lot of unnecessary work.

Another:

Checking: http://localhost:8000/css/ie7-hover-bug-z-index-ignored-and-other-properties/                        --> Traceback (most recent call last):
  File "commands/crawl.py", line 88, in <module>
    main()
  File "commands/crawl.py", line 77, in main
    print(("VALID" if html5validate.validate(html) is None else "INVALID"))
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5validate.py", line 36, in validate
    dom = PARSER.parse(text)
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 289, in parse
    self._parse(stream, False, None, *args, **kwargs)
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 134, in _parse
    self.mainLoop()
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 217, in mainLoop
    self.parseError(new_token["data"], new_token.get("datavars", {}))
  File "/Users/EmilStenstrom/.pyenv/versions/friendlybit/lib/python3.8/site-packages/html5lib/html5parser.py", line 326, in parseError
    raise ParseError(E[errorcode] % datavars)
html5lib.html5parser.ParseError: Unexpected character after attribute value.

Doesn't give any context over where in the document it is, which again takes a lot of work when the document is large.

Any chance the error messages could be made mode descriptive?

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