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//opt/alt/python37/lib/python3.7/site-packages/html5lib/filters/lint.py

from __future__ import absolute_import, division, unicode_literals

from six import text_type

from . import base
from ..constants import namespaces, voidElements

from ..constants import spaceCharacters
spaceCharacters = "".join(spaceCharacters)

class Filter(base.Filter):
    """Lints the token stream for errors

If it finds any errors, it'll raise an ``AssertionError``.

"""
    def __init__(self, source, require_matching_tags=True):
        """Creates a Filter

:arg source: the source token stream

:arg require_matching_tags: whether or not to require matching tags

"""
        super(Filter, self).__init__(source)
        self.require_matching_tags = require_matching_tags

def __iter__(self):
        open_elements = []
        for token in base.Filter.__iter__(self):
            type = token["type"]
            if type in ("StartTag", "EmptyTag"):
                namespace = token["namespace"]
                name = token["name"]
                assert namespace is None or isinstance(namespace, text_type)
                assert namespace != ""
                assert isinstance(name, text_type)
                assert name != ""
                assert isinstance(token["data"], dict)
                if (not namespace or namespace == namespaces["html"]) and name in voidElements:
                    assert type == "EmptyTag"
                else:
                    assert type == "StartTag"
                if type == "StartTag" and self.require_matching_tags:
                    open_elements.append((namespace, name))
                for (namespace, name), value in token["data"].items():
                    assert namespace is None or isinstance(namespace, text_type)
                    assert namespace != ""
                    assert isinstance(name, text_type)
                    assert name != ""
                    assert isinstance(value, text_type)

elif type == "EndTag":
                namespace = token["namespace"]
                name = token["name"]
                assert namespace is None or isinstance(namespace, text_type)
                assert namespace != ""
                assert isinstance(name, text_type)
                assert name != ""
                if (not namespace or namespace == namespaces["html"]) and name in voidElements:
                    assert False, "Void element reported as EndTag token: %(tag)s" % {"tag": name}
                elif self.require_matching_tags:
                    start = open_elements.pop()
                    assert start == (namespace, name)

elif type == "Comment":
                data = token["data"]
                assert isinstance(data, text_type)

elif type in ("Characters", "SpaceCharacters"):
                data = token["data"]
                assert isinstance(data, text_type)
                assert data != ""
                if type == "SpaceCharacters":
                    assert data.strip(spaceCharacters) == ""

elif type == "Doctype":
                name = token["name"]
                assert name is None or isinstance(name, text_type)
                assert token["publicId"] is None or isinstance(name, text_type)
                assert token["systemId"] is None or isinstance(name, text_type)

elif type == "Entity":
                assert isinstance(token["name"], text_type)

elif type == "SerializerError":
                assert isinstance(token["data"], text_type)

else:
                assert False, "Unknown token type: %(type)s" % {"type": type}

yield token