File: test_htmlparser.py

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"""Tests for HTMLParser.py."""

import html.parser
import pprint
import unittest

from unittest.mock import patch
from test import support


class EventCollector(html.parser.HTMLParser):

    def __init__(self, *args, **kw):
        self.events = []
        self.append = self.events.append
        html.parser.HTMLParser.__init__(self, *args, **kw)

    def get_events(self):
        # Normalize the list of events so that buffer artefacts don't
        # separate runs of contiguous characters.
        L = []
        prevtype = None
        for event in self.events:
            type = event[0]
            if type == prevtype == "data":
                L[-1] = ("data", L[-1][1] + event[1])
            else:
                L.append(event)
            prevtype = type
        self.events = L
        return L

    # structure markup

    def handle_starttag(self, tag, attrs):
        self.append(("starttag", tag, attrs))

    def handle_startendtag(self, tag, attrs):
        self.append(("startendtag", tag, attrs))

    def handle_endtag(self, tag):
        self.append(("endtag", tag))

    # all other markup

    def handle_comment(self, data):
        self.append(("comment", data))

    def handle_charref(self, data):
        self.append(("charref", data))

    def handle_data(self, data):
        self.append(("data", data))

    def handle_decl(self, data):
        self.append(("decl", data))

    def handle_entityref(self, data):
        self.append(("entityref", data))

    def handle_pi(self, data):
        self.append(("pi", data))

    def unknown_decl(self, decl):
        self.append(("unknown decl", decl))


class EventCollectorExtra(EventCollector):

    def handle_starttag(self, tag, attrs):
        EventCollector.handle_starttag(self, tag, attrs)
        self.append(("starttag_text", self.get_starttag_text()))


class EventCollectorCharrefs(EventCollector):

    def handle_charref(self, data):
        self.fail('This should never be called with convert_charrefs=True')

    def handle_entityref(self, data):
        self.fail('This should never be called with convert_charrefs=True')


# The normal event collector normalizes the events in get_events,
# so we override it to return the original list of events.
class EventCollectorNoNormalize(EventCollector):
    def get_events(self):
        return self.events


class TestCaseBase(unittest.TestCase):

    def get_collector(self):
        return EventCollector(convert_charrefs=False)

    def _run_check(self, source, expected_events, collector=None):
        if collector is None:
            collector = self.get_collector()
        parser = collector
        for s in source:
            parser.feed(s)
        parser.close()
        events = parser.get_events()
        if events != expected_events:
            self.fail("received events did not match expected events" +
                      "\nSource:\n" + repr(source) +
                      "\nExpected:\n" + pprint.pformat(expected_events) +
                      "\nReceived:\n" + pprint.pformat(events))

    def _run_check_extra(self, source, events):
        self._run_check(source, events,
                        EventCollectorExtra(convert_charrefs=False))


class HTMLParserTestCase(TestCaseBase):

    def test_processing_instruction_only(self):
        self._run_check("<?processing instruction>", [
            ("pi", "processing instruction"),
            ])
        self._run_check("<?processing instruction ?>", [
            ("pi", "processing instruction ?"),
            ])

    def test_simple_html(self):
        self._run_check("""
<!DOCTYPE html PUBLIC 'foo'>
<HTML>&entity;&#32;
<!--comment1a
-></foo><bar>&lt;<?pi?></foo<bar
comment1b-->
<Img sRc='Bar' isMAP>sample
text
&#x201C;
<!--comment2a-- --comment2b-->
</Html>
""", [
    ("data", "\n"),
    ("decl", "DOCTYPE html PUBLIC 'foo'"),
    ("data", "\n"),
    ("starttag", "html", []),
    ("entityref", "entity"),
    ("charref", "32"),
    ("data", "\n"),
    ("comment", "comment1a\n-></foo><bar>&lt;<?pi?></foo<bar\ncomment1b"),
    ("data", "\n"),
    ("starttag", "img", [("src", "Bar"), ("ismap", None)]),
    ("data", "sample\ntext\n"),
    ("charref", "x201C"),
    ("data", "\n"),
    ("comment", "comment2a-- --comment2b"),
    ("data", "\n"),
    ("endtag", "html"),
    ("data", "\n"),
    ])

    def test_malformatted_charref(self):
        self._run_check("<p>&#bad;</p>", [
            ("starttag", "p", []),
            ("data", "&#bad;"),
            ("endtag", "p"),
        ])
        # add the [] as a workaround to avoid buffering (see #20288)
        self._run_check(["<div>&#bad;</div>"], [
            ("starttag", "div", []),
            ("data", "&#bad;"),
            ("endtag", "div"),
        ])

    def test_unclosed_entityref(self):
        self._run_check("&entityref foo", [
            ("entityref", "entityref"),
            ("data", " foo"),
            ])

    def test_bad_nesting(self):
        # Strangely, this *is* supposed to test that overlapping
        # elements are allowed.  HTMLParser is more geared toward
        # lexing the input that parsing the structure.
        self._run_check("<a><b></a></b>", [
            ("starttag", "a", []),
            ("starttag", "b", []),
            ("endtag", "a"),
            ("endtag", "b"),
            ])

    def test_bare_ampersands(self):
        self._run_check("this text & contains & ampersands &", [
            ("data", "this text & contains & ampersands &"),
            ])

    def test_bare_pointy_brackets(self):
        self._run_check("this < text > contains < bare>pointy< brackets", [
            ("data", "this < text > contains < bare>pointy< brackets"),
            ])

    def test_starttag_end_boundary(self):
        self._run_check("""<a b='<'>""", [("starttag", "a", [("b", "<")])])
        self._run_check("""<a b='>'>""", [("starttag", "a", [("b", ">")])])

    def test_buffer_artefacts(self):
        output = [("starttag", "a", [("b", "<")])]
        self._run_check(["<a b='<'>"], output)
        self._run_check(["<a ", "b='<'>"], output)
        self._run_check(["<a b", "='<'>"], output)
        self._run_check(["<a b=", "'<'>"], output)
        self._run_check(["<a b='<", "'>"], output)
        self._run_check(["<a b='<'", ">"], output)

        output = [("starttag", "a", [("b", ">")])]
        self._run_check(["<a b='>'>"], output)
        self._run_check(["<a ", "b='>'>"], output)
        self._run_check(["<a b", "='>'>"], output)
        self._run_check(["<a b=", "'>'>"], output)
        self._run_check(["<a b='>", "'>"], output)
        self._run_check(["<a b='>'", ">"], output)

        output = [("comment", "abc")]
        self._run_check(["", "<!--abc-->"], output)
        self._run_check(["<", "!--abc-->"], output)
        self._run_check(["<!", "--abc-->"], output)
        self._run_check(["<!-", "-abc-->"], output)
        self._run_check(["<!--", "abc-->"], output)
        self._run_check(["<!--a", "bc-->"], output)
        self._run_check(["<!--ab", "c-->"], output)
        self._run_check(["<!--abc", "-->"], output)
        self._run_check(["<!--abc-", "->"], output)
        self._run_check(["<!--abc--", ">"], output)
        self._run_check(["<!--abc-->", ""], output)

    def test_valid_doctypes(self):
        # from http://www.w3.org/QA/2002/04/valid-dtd-list.html
        dtds = ['HTML',  # HTML5 doctype
                ('HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" '
                 '"http://www.w3.org/TR/html4/strict.dtd"'),
                ('HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" '
                 '"http://www.w3.org/TR/html4/loose.dtd"'),
                ('html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" '
                 '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"'),
                ('html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" '
                 '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"'),
                ('math PUBLIC "-//W3C//DTD MathML 2.0//EN" '
                 '"http://www.w3.org/Math/DTD/mathml2/mathml2.dtd"'),
                ('html PUBLIC "-//W3C//DTD '
                 'XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" '
                 '"http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg.dtd"'),
                ('svg PUBLIC "-//W3C//DTD SVG 1.1//EN" '
                 '"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"'),
                'html PUBLIC "-//IETF//DTD HTML 2.0//EN"',
                'html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"']
        for dtd in dtds:
            self._run_check("<!DOCTYPE %s>" % dtd,
                            [('decl', 'DOCTYPE ' + dtd)])

    def test_startendtag(self):
        self._run_check("<p/>", [
            ("startendtag", "p", []),
            ])
        self._run_check("<p></p>", [
            ("starttag", "p", []),
            ("endtag", "p"),
            ])
        self._run_check("<p><img src='foo' /></p>", [
            ("starttag", "p", []),
            ("startendtag", "img", [("src", "foo")]),
            ("endtag", "p"),
            ])

    def test_get_starttag_text(self):
        s = """<foo:bar   \n   one="1"\ttwo=2   >"""
        self._run_check_extra(s, [
            ("starttag", "foo:bar", [("one", "1"), ("two", "2")]),
            ("starttag_text", s)])

    @support.subTests('content', [
            '<!-- not a comment --> &not-an-entity-ref;',
            "<not a='start tag'>",
            '<a href="" /> <p> <span></span>',
            'foo = "</scr" + "ipt>";',
            'foo = "</SCRIPT" + ">";',
            'foo = <\n/script> ',
            '<!-- document.write("</scr" + "ipt>"); -->',
            ('\n//<![CDATA[\n'
             'document.write(\'<s\'+\'cript type="text/javascript" '
             'src="http://www.example.org/r=\'+new '
             'Date().getTime()+\'"><\\/s\'+\'cript>\');\n//]]>'),
            '\n<!-- //\nvar foo = 3.14;\n// -->\n',
            '<!-- \u2603 -->',
            'foo = "</ script>"',
            'foo = "</scripture>"',
            'foo = "</script\v>"',
            'foo = "</script\xa0>"',
            'foo = "</ſcript>"',
            'foo = "</scrıpt>"',
        ])
    def test_script_content(self, content):
        s = f'<script>{content}</script>'
        self._run_check(s, [("starttag", "script", []),
                            ("data", content),
                            ("endtag", "script")])

    @support.subTests('content', [
            'a::before { content: "<!-- not a comment -->"; }',
            'a::before { content: "&not-an-entity-ref;"; }',
            'a::before { content: "<not a=\'start tag\'>"; }',
            'a::before { content: "\u2603"; }',
            'a::before { content: "< /style>"; }',
            'a::before { content: "</ style>"; }',
            'a::before { content: "</styled>"; }',
            'a::before { content: "</style\v>"; }',
            'a::before { content: "</style\xa0>"; }',
            'a::before { content: "</ſtyle>"; }',
        ])
    def test_style_content(self, content):
        s = f'<style>{content}</style>'
        self._run_check(s, [("starttag", "style", []),
                            ("data", content),
                            ("endtag", "style")])

    @support.subTests('content', [
            '<!-- not a comment -->',
            "<not a='start tag'>",
            '<![CDATA[not a cdata]]>',
            '<!not a bogus comment>',
            '</not a bogus comment>',
            '\u2603',
            '< /title>',
            '</ title>',
            '</titled>',
            '</title\v>',
            '</title\xa0>',
            '</tıtle>',
        ])
    def test_title_content(self, content):
        source = f"<title>{content}</title>"
        self._run_check(source, [
            ("starttag", "title", []),
            ("data", content),
            ("endtag", "title"),
        ])

    @support.subTests('content', [
            '<!-- not a comment -->',
            "<not a='start tag'>",
            '<![CDATA[not a cdata]]>',
            '<!not a bogus comment>',
            '</not a bogus comment>',
            '\u2603',
            '< /textarea>',
            '</ textarea>',
            '</textareable>',
            '</textarea\v>',
            '</textarea\xa0>',
        ])
    def test_textarea_content(self, content):
        source = f"<textarea>{content}</textarea>"
        self._run_check(source, [
            ("starttag", "textarea", []),
            ("data", content),
            ("endtag", "textarea"),
        ])

    @support.subTests('endtag', ['script', 'SCRIPT', 'script ', 'script\n',
                                 'script/', 'script foo=bar', 'script foo=">"'])
    def test_script_closing_tag(self, endtag):
        # see issue #13358
        # make sure that HTMLParser calls handle_data only once for each CDATA.
        content = """<!-- not a comment --> &not-an-entity-ref;
                  <a href="" /> </p><p> <span></span></style>
                  '</script' + '>'"""
        s = f'<ScrIPt>{content}</{endtag}>'
        self._run_check(s, [("starttag", "script", []),
                            ("data", content),
                            ("endtag", "script")],
                        collector=EventCollectorNoNormalize(convert_charrefs=False))

    @support.subTests('endtag', ['style', 'STYLE', 'style ', 'style\n',
                                 'style/', 'style foo=bar', 'style foo=">"'])
    def test_style_closing_tag(self, endtag):
        content = """
            b::before { content: "<!-- not a comment -->"; }
            p::before { content: "&not-an-entity-ref;"; }
            a::before { content: "<i>"; }
            a::after { content: "</i>"; }
            """
        s = f'<StyLE>{content}</{endtag}>'
        self._run_check(s, [("starttag", "style", []),
                            ("data", content),
                            ("endtag", "style")],
                        collector=EventCollectorNoNormalize(convert_charrefs=False))

    @support.subTests('endtag', ['title', 'TITLE', 'title ', 'title\n',
                                 'title/', 'title foo=bar', 'title foo=">"'])
    def test_title_closing_tag(self, endtag):
        content = "<!-- not a comment --><i>Egg &amp; Spam</i>"
        s = f'<TitLe>{content}</{endtag}>'
        self._run_check(s, [("starttag", "title", []),
                            ('data', '<!-- not a comment --><i>Egg & Spam</i>'),
                            ("endtag", "title")],
                        collector=EventCollectorNoNormalize(convert_charrefs=True))
        self._run_check(s, [("starttag", "title", []),
                            ('data', '<!-- not a comment --><i>Egg '),
                            ('entityref', 'amp'),
                            ('data', ' Spam</i>'),
                            ("endtag", "title")],
                        collector=EventCollectorNoNormalize(convert_charrefs=False))

    @support.subTests('endtag', ['textarea', 'TEXTAREA', 'textarea ', 'textarea\n',
                                 'textarea/', 'textarea foo=bar', 'textarea foo=">"'])
    def test_textarea_closing_tag(self, endtag):
        content = "<!-- not a comment --><i>Egg &amp; Spam</i>"
        s = f'<TexTarEa>{content}</{endtag}>'
        self._run_check(s, [("starttag", "textarea", []),
                            ('data', '<!-- not a comment --><i>Egg & Spam</i>'),
                            ("endtag", "textarea")],
                        collector=EventCollectorNoNormalize(convert_charrefs=True))
        self._run_check(s, [("starttag", "textarea", []),
                            ('data', '<!-- not a comment --><i>Egg '),
                            ('entityref', 'amp'),
                            ('data', ' Spam</i>'),
                            ("endtag", "textarea")],
                        collector=EventCollectorNoNormalize(convert_charrefs=False))

    @support.subTests('tail,end', [
        ('', False),
        ('<', False),
        ('</', False),
        ('</s', False),
        ('</script', False),
        ('</script ', True),
        ('</script foo=bar', True),
        ('</script foo=">', True),
    ])
    def test_eof_in_script(self, tail, end):
        content = "a = 123"
        s = f'<ScrIPt>{content}{tail}'
        self._run_check(s, [("starttag", "script", []),
                            ("data", content if end else content + tail)],
                        collector=EventCollectorNoNormalize(convert_charrefs=False))

    @support.subTests('tail,end', [
        ('', False),
        ('<', False),
        ('</', False),
        ('</t', False),
        ('</title', False),
        ('</title ', True),
        ('</title foo=bar', True),
        ('</title foo=">', True),
    ])
    def test_eof_in_title(self, tail, end):
        s = f'<TitLe>Egg &amp; Spam{tail}'
        self._run_check(s, [("starttag", "title", []),
                            ("data", "Egg & Spam" + ('' if end else tail))],
                        collector=EventCollectorNoNormalize(convert_charrefs=True))
        self._run_check(s, [("starttag", "title", []),
                            ('data', 'Egg '),
                            ('entityref', 'amp'),
                            ('data', ' Spam' + ('' if end else tail))],
                        collector=EventCollectorNoNormalize(convert_charrefs=False))

    def test_comments(self):
        html = ("<!-- I'm a valid comment -->"
                '<!--me too!-->'
                '<!------>'
                '<!----->'
                '<!---->'
                # abrupt-closing-of-empty-comment
                '<!--->'
                '<!-->'
                '<!----I have many hyphens---->'
                '<!-- I have a > in the middle -->'
                '<!-- and I have -- in the middle! -->'
                '<!--incorrectly-closed-comment--!>'
                '<!----!>'
                '<!----!-->'
                '<!---- >-->'
                '<!---!>-->'
                '<!--!>-->'
                # nested-comment
                '<!-- <!-- nested --> -->'
                '<!--<!-->'
                '<!--<!--!>'
        )
        expected = [('comment', " I'm a valid comment "),
                    ('comment', 'me too!'),
                    ('comment', '--'),
                    ('comment', '-'),
                    ('comment', ''),
                    ('comment', ''),
                    ('comment', ''),
                    ('comment', '--I have many hyphens--'),
                    ('comment', ' I have a > in the middle '),
                    ('comment', ' and I have -- in the middle! '),
                    ('comment', 'incorrectly-closed-comment'),
                    ('comment', ''),
                    ('comment', '--!'),
                    ('comment', '-- >'),
                    ('comment', '-!>'),
                    ('comment', '!>'),
                    ('comment', ' <!-- nested '), ('data', ' -->'),
                    ('comment', '<!'),
                    ('comment', '<!'),
        ]
        self._run_check(html, expected)

    def test_condcoms(self):
        html = ('<!--[if IE & !(lte IE 8)]>aren\'t<![endif]-->'
                '<!--[if IE 8]>condcoms<![endif]-->'
                '<!--[if lte IE 7]>pretty?<![endif]-->')
        expected = [('comment', "[if IE & !(lte IE 8)]>aren't<![endif]"),
                    ('comment', '[if IE 8]>condcoms<![endif]'),
                    ('comment', '[if lte IE 7]>pretty?<![endif]')]
        self._run_check(html, expected)

    def test_convert_charrefs(self):
        # default value for convert_charrefs is now True
        collector = lambda: EventCollectorCharrefs()
        self.assertTrue(collector().convert_charrefs)
        charrefs = ['&quot;', '&#34;', '&#x22;', '&quot', '&#34', '&#x22']
        # check charrefs in the middle of the text
        expected = [('starttag', 'a', []), ('data', 'a"z'), ('endtag', 'a')]
        for charref in charrefs:
            self._run_check('<a>a{0}z</a>'.format(charref),
                            expected, collector=collector())
        # check charrefs at the beginning/end of the text
        expected = [('data', '"'), ('starttag', 'a', []),
                    ('data', '"'), ('endtag', 'a'), ('data', '"')]
        for charref in charrefs:
            self._run_check('{0}<a>'
                            '{0}</a>{0}'.format(charref),
                            expected, collector=collector())
        # check charrefs in <script>/<style> elements
        for charref in charrefs:
            text = 'X'.join([charref]*3)
            expected = [('data', '"'),
                        ('starttag', 'script', []), ('data', text),
                        ('endtag', 'script'), ('data', '"'),
                        ('starttag', 'style', []), ('data', text),
                        ('endtag', 'style'), ('data', '"')]
            self._run_check('{1}<script>{0}</script>{1}'
                            '<style>{0}</style>{1}'.format(text, charref),
                            expected, collector=collector())
        # check truncated charrefs at the end of the file
        html = '&quo &# &#x'
        for x in range(1, len(html)):
            self._run_check(html[:x], [('data', html[:x])],
                            collector=collector())
        # check a string with no charrefs
        self._run_check('no charrefs here', [('data', 'no charrefs here')],
                        collector=collector())

    def test_convert_charrefs_in_attribute_values(self):
        # default value for convert_charrefs is now True
        collector = lambda: EventCollectorCharrefs()
        self.assertTrue(collector().convert_charrefs)

        # always unescape terminated entity refs, numeric and hex char refs:
        # - regardless whether they are at start, middle, end of attribute
        # - or followed by alphanumeric, non-alphanumeric, or equals char
        charrefs = ['&cent;', '&#xa2;', '&#xa2', '&#162;', '&#162']
        expected = [('starttag', 'a',
                     [('x', '¢'), ('x', 'z¢'), ('x', '¢z'),
                      ('x', 'z¢z'), ('x', '¢ z'), ('x', '¢=z')]),
                    ('endtag', 'a')]
        for charref in charrefs:
            self._run_check('<a x="{0}" x="z{0}" x="{0}z" '
                            '   x="z{0}z" x="{0} z" x="{0}=z"></a>'
                            .format(charref), expected, collector=collector())

        # only unescape unterminated entity matches if they are not followed by
        # an alphanumeric or an equals sign
        charref = '&cent'
        expected = [('starttag', 'a',
                     [('x', '¢'), ('x', 'z¢'), ('x', '&centz'),
                      ('x', 'z&centz'), ('x', '¢ z'), ('x', '&cent=z')]),
                    ('endtag', 'a')]
        self._run_check('<a x="{0}" x="z{0}" x="{0}z" '
                        '   x="z{0}z" x="{0} z" x="{0}=z"></a>'
                        .format(charref), expected, collector=collector())

    # the remaining tests were for the "tolerant" parser (which is now
    # the default), and check various kind of broken markup
    def test_tolerant_parsing(self):
        self._run_check('<html <html>te>>xt&a<<bc</a></html>\n'
                        '<img src="URL><//img></html</html>', [
                            ('starttag', 'html', [('<html', None)]),
                            ('data', 'te>>xt'),
                            ('entityref', 'a'),
                            ('data', '<'),
                            ('starttag', 'bc<', [('a', None)]),
                            ('endtag', 'html'),
                            ('data', '\n')])

    def test_starttag_junk_chars(self):
        self._run_check("<", [('data', '<')])
        self._run_check("<>", [('data', '<>')])
        self._run_check("< >", [('data', '< >')])
        self._run_check("< ", [('data', '< ')])
        self._run_check("</>", [])
        self._run_check("<$>", [('data', '<$>')])
        self._run_check("</$>", [('comment', '$')])
        self._run_check("</", [('data', '</')])
        self._run_check("</a", [])
        self._run_check("</ a>", [('comment', ' a')])
        self._run_check("</ a", [('comment', ' a')])
        self._run_check("<a<a>", [('starttag', 'a<a', [])])
        self._run_check("</a<a>", [('endtag', 'a<a')])
        self._run_check("<!", [('comment', '')])
        self._run_check("<a", [])
        self._run_check("<a foo='bar'", [])
        self._run_check("<a foo='bar", [])
        self._run_check("<a foo='>'", [])
        self._run_check("<a foo='>", [])
        self._run_check("<a$>", [('starttag', 'a$', [])])
        self._run_check("<a$b>", [('starttag', 'a$b', [])])
        self._run_check("<a$b/>", [('startendtag', 'a$b', [])])
        self._run_check("<a$b  >", [('starttag', 'a$b', [])])
        self._run_check("<a$b  />", [('startendtag', 'a$b', [])])
        self._run_check("</a$b>", [('endtag', 'a$b')])

    def test_slashes_in_starttag(self):
        self._run_check('<a foo="var"/>', [('startendtag', 'a', [('foo', 'var')])])
        html = ('<img width=902 height=250px '
                'src="/sites/default/files/images/homepage/foo.jpg" '
                '/*what am I doing here*/ />')
        expected = [(
            'startendtag', 'img',
            [('width', '902'), ('height', '250px'),
             ('src', '/sites/default/files/images/homepage/foo.jpg'),
             ('*what', None), ('am', None), ('i', None),
             ('doing', None), ('here*', None)]
        )]
        self._run_check(html, expected)
        html = ('<a / /foo/ / /=/ / /bar/ / />'
                '<a / /foo/ / /=/ / /bar/ / >')
        expected = [
            ('startendtag', 'a', [('foo', None), ('=', None), ('bar', None)]),
            ('starttag', 'a', [('foo', None), ('=', None), ('bar', None)])
        ]
        self._run_check(html, expected)
        #see issue #14538
        html = ('<meta><meta / ><meta // ><meta / / >'
                '<meta/><meta /><meta //><meta//>')
        expected = [
            ('starttag', 'meta', []), ('starttag', 'meta', []),
            ('starttag', 'meta', []), ('starttag', 'meta', []),
            ('startendtag', 'meta', []), ('startendtag', 'meta', []),
            ('startendtag', 'meta', []), ('startendtag', 'meta', []),
        ]
        self._run_check(html, expected)

    def test_slashes_in_endtag(self):
        self._run_check('</a/>', [('endtag', 'a')])
        self._run_check('</a foo="var"/>', [('endtag', 'a')])

    def test_declaration_junk_chars(self):
        self._run_check("<!DOCTYPE foo $ >", [('decl', 'DOCTYPE foo $ ')])

    def test_illegal_declarations(self):
        self._run_check('<!spacer type="block" height="25">',
                        [('comment', 'spacer type="block" height="25"')])

    def test_invalid_end_tags(self):
        # A collection of broken end tags. <br> is used as separator.
        # see http://www.w3.org/TR/html5/tokenization.html#end-tag-open-state
        # and #13993
        html = ('<br></label</p><br></div end tmAd-leaderBoard><br></<h4><br>'
                '</li class="unit"><br></li\r\n\t\t\t\t\t\t</ul><br></><br>')
        expected = [('starttag', 'br', []),
                    # < is part of the name, / is discarded, p is an attribute
                    ('endtag', 'label<'),
                    ('starttag', 'br', []),
                    # text and attributes are discarded
                    ('endtag', 'div'),
                    ('starttag', 'br', []),
                    # comment because the first char after </ is not a-zA-Z
                    ('comment', '<h4'),
                    ('starttag', 'br', []),
                    # attributes are discarded
                    ('endtag', 'li'),
                    ('starttag', 'br', []),
                    # everything till ul (included) is discarded
                    ('endtag', 'li'),
                    ('starttag', 'br', []),
                    # </> is ignored
                    ('starttag', 'br', [])]
        self._run_check(html, expected)

    def test_broken_invalid_end_tag(self):
        html = '<b>This</b attr=">"> confuses the parser'
        expected = [('starttag', 'b', []),
                    ('data', 'This'),
                    ('endtag', 'b'),
                    ('data', ' confuses the parser')]
        self._run_check(html, expected)

    def test_correct_detection_of_start_tags(self):
        # see #13273
        html = ('<div style=""    ><b>The <a href="some_url">rain</a> '
                '<br /> in <span>Spain</span></b></div>')
        expected = [
            ('starttag', 'div', [('style', '')]),
            ('starttag', 'b', []),
            ('data', 'The '),
            ('starttag', 'a', [('href', 'some_url')]),
            ('data', 'rain'),
            ('endtag', 'a'),
            ('data', ' '),
            ('startendtag', 'br', []),
            ('data', ' in '),
            ('starttag', 'span', []),
            ('data', 'Spain'),
            ('endtag', 'span'),
            ('endtag', 'b'),
            ('endtag', 'div')
        ]
        self._run_check(html, expected)

        html = '<div style="", foo = "bar" ><b>The <a href="some_url">rain</a>'
        expected = [
            ('starttag', 'div', [('style', ''), (',', None), ('foo', 'bar')]),
            ('starttag', 'b', []),
            ('data', 'The '),
            ('starttag', 'a', [('href', 'some_url')]),
            ('data', 'rain'),
            ('endtag', 'a'),
        ]
        self._run_check(html, expected)

    def test_EOF_in_charref(self):
        # see #17802
        # This test checks that the UnboundLocalError reported in the issue
        # is not raised, however I'm not sure the returned values are correct.
        # Maybe HTMLParser should use self.unescape for these
        data = [
            ('a&', [('data', 'a&')]),
            ('a&b', [('data', 'ab')]),
            ('a&b ', [('data', 'a'), ('entityref', 'b'), ('data', ' ')]),
            ('a&b;', [('data', 'a'), ('entityref', 'b')]),
        ]
        for html, expected in data:
            self._run_check(html, expected)

    def test_eof_in_comments(self):
        data = [
            ('<!--', [('comment', '')]),
            ('<!---', [('comment', '')]),
            ('<!----', [('comment', '')]),
            ('<!-----', [('comment', '-')]),
            ('<!------', [('comment', '--')]),
            ('<!----!', [('comment', '')]),
            ('<!---!', [('comment', '-!')]),
            ('<!---!>', [('comment', '-!>')]),
            ('<!--foo', [('comment', 'foo')]),
            ('<!--foo-', [('comment', 'foo')]),
            ('<!--foo--', [('comment', 'foo')]),
            ('<!--foo--!', [('comment', 'foo')]),
            ('<!--<!--', [('comment', '<!')]),
            ('<!--<!--!', [('comment', '<!')]),
        ]
        for html, expected in data:
            self._run_check(html, expected)

    def test_eof_in_declarations(self):
        data = [
            ('<!', [('comment', '')]),
            ('<!-', [('comment', '-')]),
            ('<![', [('comment', '[')]),
            ('<![CDATA[', [('unknown decl', 'CDATA[')]),
            ('<![CDATA[x', [('unknown decl', 'CDATA[x')]),
            ('<![CDATA[x]', [('unknown decl', 'CDATA[x]')]),
            ('<![CDATA[x]]', [('unknown decl', 'CDATA[x]]')]),
            ('<!DOCTYPE', [('decl', 'DOCTYPE')]),
            ('<!DOCTYPE ', [('decl', 'DOCTYPE ')]),
            ('<!DOCTYPE html', [('decl', 'DOCTYPE html')]),
            ('<!DOCTYPE html ', [('decl', 'DOCTYPE html ')]),
            ('<!DOCTYPE html PUBLIC', [('decl', 'DOCTYPE html PUBLIC')]),
            ('<!DOCTYPE html PUBLIC "foo', [('decl', 'DOCTYPE html PUBLIC "foo')]),
            ('<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "foo',
             [('decl', 'DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "foo')]),
        ]
        for html, expected in data:
            self._run_check(html, expected)

    def test_bogus_comments(self):
        html = ('<!ELEMENT br EMPTY>'
                '<! not really a comment >'
                '<! not a comment either -->'
                '<! -- close enough -->'
                '<!><!<-- this was an empty comment>'
                '<!!! another bogus comment !!!>'
                # see #32876
                '<![with square brackets]!>'
                '<![\nmultiline\nbogusness\n]!>'
                '<![more brackets]-[and a hyphen]!>'
                '<![cdata[should be uppercase]]>'
                '<![CDATA [whitespaces are not ignored]]>'
                '<![CDATA]]>'  # required '[' after CDATA
        )
        expected = [
            ('comment', 'ELEMENT br EMPTY'),
            ('comment', ' not really a comment '),
            ('comment', ' not a comment either --'),
            ('comment', ' -- close enough --'),
            ('comment', ''),
            ('comment', '<-- this was an empty comment'),
            ('comment', '!! another bogus comment !!!'),
            ('comment', '[with square brackets]!'),
            ('comment', '[\nmultiline\nbogusness\n]!'),
            ('comment', '[more brackets]-[and a hyphen]!'),
            ('comment', '[cdata[should be uppercase]]'),
            ('comment', '[CDATA [whitespaces are not ignored]]'),
            ('comment', '[CDATA]]'),
        ]
        self._run_check(html, expected)

    def test_broken_condcoms(self):
        # these condcoms are missing the '--' after '<!' and before the '>'
        # and they are considered bogus comments according to
        # "8.2.4.42. Markup declaration open state"
        html = ('<![if !(IE)]>broken condcom<![endif]>'
                '<![if ! IE]><link href="favicon.tiff"/><![endif]>'
                '<![if !IE 6]><img src="firefox.png" /><![endif]>'
                '<![if !ie 6]><b>foo</b><![endif]>'
                '<![if (!IE)|(lt IE 9)]><img src="mammoth.bmp" /><![endif]>')
        expected = [
            ('comment', '[if !(IE)]'),
            ('data', 'broken condcom'),
            ('comment', '[endif]'),
            ('comment', '[if ! IE]'),
            ('startendtag', 'link', [('href', 'favicon.tiff')]),
            ('comment', '[endif]'),
            ('comment', '[if !IE 6]'),
            ('startendtag', 'img', [('src', 'firefox.png')]),
            ('comment', '[endif]'),
            ('comment', '[if !ie 6]'),
            ('starttag', 'b', []),
            ('data', 'foo'),
            ('endtag', 'b'),
            ('comment', '[endif]'),
            ('comment', '[if (!IE)|(lt IE 9)]'),
            ('startendtag', 'img', [('src', 'mammoth.bmp')]),
            ('comment', '[endif]')
        ]
        self._run_check(html, expected)

    def test_cdata_declarations(self):
        # More tests should be added. See also "8.2.4.42. Markup
        # declaration open state", "8.2.4.69. CDATA section state",
        # and issue 32876
        html = ('<![CDATA[just some plain text]]>')
        expected = [('unknown decl', 'CDATA[just some plain text')]
        self._run_check(html, expected)

    def test_cdata_declarations_multiline(self):
        html = ('<code><![CDATA['
                '    if (a < b && a > b) {'
                '        printf("[<marquee>How?</marquee>]");'
                '    }'
                ']]></code>')
        expected = [
            ('starttag', 'code', []),
            ('unknown decl',
             'CDATA[    if (a < b && a > b) {        '
             'printf("[<marquee>How?</marquee>]");    }'),
            ('endtag', 'code')
        ]
        self._run_check(html, expected)

    def test_convert_charrefs_dropped_text(self):
        # #23144: make sure that all the events are triggered when
        # convert_charrefs is True, even if we don't call .close()
        parser = EventCollector(convert_charrefs=True)
        # before the fix, bar & baz was missing
        parser.feed("foo <a>link</a> bar &amp; baz")
        self.assertEqual(
            parser.get_events(),
            [('data', 'foo '), ('starttag', 'a', []), ('data', 'link'),
             ('endtag', 'a'), ('data', ' bar & baz')]
        )

    @support.requires_resource('cpu')
    def test_eof_no_quadratic_complexity(self):
        # Each of these examples used to take about an hour.
        # Now they take a fraction of a second.
        def check(source):
            parser = html.parser.HTMLParser()
            parser.feed(source)
            parser.close()
        n = 120_000
        check("<a " * n)
        check("<a a=" * n)
        check("</a " * 14 * n)
        check("</a a=" * 11 * n)
        check("<!--" * 4 * n)
        check("<!" * 60 * n)
        check("<?" * 19 * n)
        check("</$" * 15 * n)
        check("<![CDATA[" * 9 * n)
        check("<!doctype" * 35 * n)


class AttributesTestCase(TestCaseBase):

    def test_attr_syntax(self):
        output = [
          ("starttag", "a", [("b", "v"), ("c", "v"), ("d", "v"), ("e", None)])
        ]
        self._run_check("""<a b='v' c="v" d=v e>""", output)
        self._run_check("<a foo==bar>", [('starttag', 'a', [('foo', '=bar')])])
        self._run_check("<a foo =bar>", [('starttag', 'a', [('foo', 'bar')])])
        self._run_check("<a foo\t=bar>", [('starttag', 'a', [('foo', 'bar')])])
        self._run_check("<a foo\v=bar>", [('starttag', 'a', [('foo\v', 'bar')])])
        self._run_check("<a foo\xa0=bar>", [('starttag', 'a', [('foo\xa0', 'bar')])])
        self._run_check("<a foo= bar>", [('starttag', 'a', [('foo', 'bar')])])
        self._run_check("<a foo=\tbar>", [('starttag', 'a', [('foo', 'bar')])])
        self._run_check("<a foo=\vbar>", [('starttag', 'a', [('foo', '\vbar')])])
        self._run_check("<a foo=\xa0bar>", [('starttag', 'a', [('foo', '\xa0bar')])])

    def test_attr_values(self):
        self._run_check("""<a b='xxx\n\txxx' c="yyy\t\nyyy" d='\txyz\n'>""",
                        [("starttag", "a", [("b", "xxx\n\txxx"),
                                            ("c", "yyy\t\nyyy"),
                                            ("d", "\txyz\n")])])
        self._run_check("""<a b='' c="">""",
                        [("starttag", "a", [("b", ""), ("c", "")])])
        self._run_check("<a b=\tx c=\ny>",
                        [('starttag', 'a', [('b', 'x'), ('c', 'y')])])
        self._run_check("<a b=\v c=\xa0>",
                        [("starttag", "a", [("b", "\v"), ("c", "\xa0")])])
        # Regression test for SF patch #669683.
        self._run_check("<e a=rgb(1,2,3)>",
                        [("starttag", "e", [("a", "rgb(1,2,3)")])])
        # Regression test for SF bug #921657.
        self._run_check(
            "<a href=mailto:xyz@example.com>",
            [("starttag", "a", [("href", "mailto:xyz@example.com")])])

    def test_attr_nonascii(self):
        # see issue 7311
        self._run_check(
            "<img src=/foo/bar.png alt=\u4e2d\u6587>",
            [("starttag", "img", [("src", "/foo/bar.png"),
                                  ("alt", "\u4e2d\u6587")])])
        self._run_check(
            "<a title='\u30c6\u30b9\u30c8' href='\u30c6\u30b9\u30c8.html'>",
            [("starttag", "a", [("title", "\u30c6\u30b9\u30c8"),
                                ("href", "\u30c6\u30b9\u30c8.html")])])
        self._run_check(
            '<a title="\u30c6\u30b9\u30c8" href="\u30c6\u30b9\u30c8.html">',
            [("starttag", "a", [("title", "\u30c6\u30b9\u30c8"),
                                ("href", "\u30c6\u30b9\u30c8.html")])])

    def test_attr_entity_replacement(self):
        self._run_check(
            "<a b='&amp;&gt;&lt;&quot;&apos;'>",
            [("starttag", "a", [("b", "&><\"'")])])

    def test_attr_funky_names(self):
        self._run_check(
            "<a a.b='v' c:d=v e-f=v>",
            [("starttag", "a", [("a.b", "v"), ("c:d", "v"), ("e-f", "v")])])

    def test_entityrefs_in_attributes(self):
        self._run_check(
            "<html foo='&euro;&amp;&#97;&#x61;&unsupported;'>",
            [("starttag", "html", [("foo", "\u20AC&aa&unsupported;")])])


    def test_attr_funky_names2(self):
        self._run_check(
            r"<a $><b $=%><c \=/>",
            [("starttag", "a", [("$", None)]),
             ("starttag", "b", [("$", "%")]),
             ("starttag", "c", [("\\", "/")])])

    def test_entities_in_attribute_value(self):
        # see #1200313
        for entity in ['&', '&amp;', '&#38;', '&#x26;']:
            self._run_check('<a href="%s">' % entity,
                            [("starttag", "a", [("href", "&")])])
            self._run_check("<a href='%s'>" % entity,
                            [("starttag", "a", [("href", "&")])])
            self._run_check("<a href=%s>" % entity,
                            [("starttag", "a", [("href", "&")])])

    def test_malformed_attributes(self):
        # see #13357
        html = (
            "<a href=test'style='color:red;bad1'>test - bad1</a>"
            "<a href=test'+style='color:red;ba2'>test - bad2</a>"
            "<a href=test'&nbsp;style='color:red;bad3'>test - bad3</a>"
            "<a href = test'&nbsp;style='color:red;bad4'  >test - bad4</a>"
        )
        expected = [
            ('starttag', 'a', [('href', "test'style='color:red;bad1'")]),
            ('data', 'test - bad1'),
            ('endtag', 'a'),
            ('starttag', 'a', [('href', "test'+style='color:red;ba2'")]),
            ('data', 'test - bad2'),
            ('endtag', 'a'),
            ('starttag', 'a', [('href', "test'\xa0style='color:red;bad3'")]),
            ('data', 'test - bad3'),
            ('endtag', 'a'),
            ('starttag', 'a', [('href', "test'\xa0style='color:red;bad4'")]),
            ('data', 'test - bad4'),
            ('endtag', 'a'),
        ]
        self._run_check(html, expected)

    def test_malformed_adjacent_attributes(self):
        # see #12629
        self._run_check('<x><y z=""o"" /></x>',
                        [('starttag', 'x', []),
                            ('startendtag', 'y', [('z', ''), ('o""', None)]),
                            ('endtag', 'x')])
        self._run_check('<x><y z="""" /></x>',
                        [('starttag', 'x', []),
                            ('startendtag', 'y', [('z', ''), ('""', None)]),
                            ('endtag', 'x')])

    # see #755670 for the following 3 tests
    def test_adjacent_attributes(self):
        self._run_check('<a width="100%"cellspacing=0>',
                        [("starttag", "a",
                          [("width", "100%"), ("cellspacing","0")])])

        self._run_check('<a id="foo"class="bar">',
                        [("starttag", "a",
                          [("id", "foo"), ("class","bar")])])

    def test_missing_attribute_value(self):
        self._run_check('<a v=>',
                        [("starttag", "a", [("v", "")])])

    def test_javascript_attribute_value(self):
        self._run_check("<a href=javascript:popup('/popup/help.html')>",
                        [("starttag", "a",
                          [("href", "javascript:popup('/popup/help.html')")])])

    def test_end_tag_in_attribute_value(self):
        # see #1745761
        self._run_check("<a href='http://www.example.org/\">;'>spam</a>",
                        [("starttag", "a",
                          [("href", "http://www.example.org/\">;")]),
                         ("data", "spam"), ("endtag", "a")])

    def test_with_unquoted_attributes(self):
        # see #12008
        html = ("<html><body bgcolor=d0ca90 text='181008'>"
                "<table cellspacing=0 cellpadding=1 width=100% ><tr>"
                "<td align=left><font size=-1>"
                "- <a href=/rabota/><span class=en> software-and-i</span></a>"
                "- <a href='/1/'><span class=en> library</span></a></table>")
        expected = [
            ('starttag', 'html', []),
            ('starttag', 'body', [('bgcolor', 'd0ca90'), ('text', '181008')]),
            ('starttag', 'table',
                [('cellspacing', '0'), ('cellpadding', '1'), ('width', '100%')]),
            ('starttag', 'tr', []),
            ('starttag', 'td', [('align', 'left')]),
            ('starttag', 'font', [('size', '-1')]),
            ('data', '- '), ('starttag', 'a', [('href', '/rabota/')]),
            ('starttag', 'span', [('class', 'en')]), ('data', ' software-and-i'),
            ('endtag', 'span'), ('endtag', 'a'),
            ('data', '- '), ('starttag', 'a', [('href', '/1/')]),
            ('starttag', 'span', [('class', 'en')]), ('data', ' library'),
            ('endtag', 'span'), ('endtag', 'a'), ('endtag', 'table')
        ]
        self._run_check(html, expected)

    def test_comma_between_attributes(self):
        # see bpo 41478
        # HTMLParser preserves duplicate attributes, leaving the task of
        # removing duplicate attributes to a conformant html tree builder
        html = ('<div class=bar,baz=asd>'        # between attrs (unquoted)
                '<div class="bar",baz="asd">'    # between attrs (quoted)
                '<div class=bar, baz=asd,>'      # after values (unquoted)
                '<div class="bar", baz="asd",>'  # after values (quoted)
                '<div class="bar",>'             # one comma values (quoted)
                '<div class=,bar baz=,asd>'      # before values (unquoted)
                '<div class=,"bar" baz=,"asd">'  # before values (quoted)
                '<div ,class=bar ,baz=asd>'      # before names
                '<div class,="bar" baz,="asd">'  # after names
        )
        expected = [
            ('starttag', 'div', [('class', 'bar,baz=asd'),]),
            ('starttag', 'div', [('class', 'bar'), (',baz', 'asd')]),
            ('starttag', 'div', [('class', 'bar,'), ('baz', 'asd,')]),
            ('starttag', 'div', [('class', 'bar'), (',', None),
                                 ('baz', 'asd'), (',', None)]),
            ('starttag', 'div', [('class', 'bar'), (',', None)]),
            ('starttag', 'div', [('class', ',bar'), ('baz', ',asd')]),
            ('starttag', 'div', [('class', ',"bar"'), ('baz', ',"asd"')]),
            ('starttag', 'div', [(',class', 'bar'), (',baz', 'asd')]),
            ('starttag', 'div', [('class,', 'bar'), ('baz,', 'asd')]),
        ]
        self._run_check(html, expected)

    def test_weird_chars_in_unquoted_attribute_values(self):
        self._run_check('<form action=bogus|&#()value>', [
                            ('starttag', 'form',
                                [('action', 'bogus|&#()value')])])


class TestInheritance(unittest.TestCase):

    @patch("_markupbase.ParserBase.__init__")
    @patch("_markupbase.ParserBase.reset")
    def test_base_class_methods_called(self, super_reset_method, super_init_method):
        with patch('_markupbase.ParserBase') as parser_base:
            EventCollector()
            super_init_method.assert_called_once()
            super_reset_method.assert_called_once()


if __name__ == "__main__":
    unittest.main()