1 files changed, 93 insertions, 0 deletions
diff --git a/testing/web-platform/tests/tools/html5lib/html5lib/filters/lint.py b/testing/web-platform/tests/tools/html5lib/html5lib/filters/lint.py
new file mode 100644
index 000000000..7cc99a4ba
--- /dev/null
+++ b/testing/web-platform/tests/tools/html5lib/html5lib/filters/lint.py
@@ -0,0 +1,93 @@
+from __future__ import absolute_import, division, unicode_literals
+
+from gettext import gettext
+_ = gettext
+
+from . import _base
+from ..constants import cdataElements, rcdataElements, voidElements
+
+from ..constants import spaceCharacters
+spaceCharacters = "".join(spaceCharacters)
+
+
+class LintError(Exception):
+    pass
+
+
+class Filter(_base.Filter):
+    def __iter__(self):
+        open_elements = []
+        contentModelFlag = "PCDATA"
+        for token in _base.Filter.__iter__(self):
+            type = token["type"]
+            if type in ("StartTag", "EmptyTag"):
+                name = token["name"]
+                if contentModelFlag != "PCDATA":
+                    raise LintError(_("StartTag not in PCDATA content model flag: %(tag)s") % {"tag": name})
+                if not isinstance(name, str):
+                    raise LintError(_("Tag name is not a string: %(tag)r") % {"tag": name})
+                if not name:
+                    raise LintError(_("Empty tag name"))
+                if type == "StartTag" and name in voidElements:
+                    raise LintError(_("Void element reported as StartTag token: %(tag)s") % {"tag": name})
+                elif type == "EmptyTag" and name not in voidElements:
+                    raise LintError(_("Non-void element reported as EmptyTag token: %(tag)s") % {"tag": token["name"]})
+                if type == "StartTag":
+                    open_elements.append(name)
+                for name, value in token["data"]:
+                    if not isinstance(name, str):
+                        raise LintError(_("Attribute name is not a string: %(name)r") % {"name": name})
+                    if not name:
+                        raise LintError(_("Empty attribute name"))
+                    if not isinstance(value, str):
+                        raise LintError(_("Attribute value is not a string: %(value)r") % {"value": value})
+                if name in cdataElements:
+                    contentModelFlag = "CDATA"
+                elif name in rcdataElements:
+                    contentModelFlag = "RCDATA"
+                elif name == "plaintext":
+                    contentModelFlag = "PLAINTEXT"
+
+            elif type == "EndTag":
+                name = token["name"]
+                if not isinstance(name, str):
+                    raise LintError(_("Tag name is not a string: %(tag)r") % {"tag": name})
+                if not name:
+                    raise LintError(_("Empty tag name"))
+                if name in voidElements:
+                    raise LintError(_("Void element reported as EndTag token: %(tag)s") % {"tag": name})
+                start_name = open_elements.pop()
+                if start_name != name:
+                    raise LintError(_("EndTag (%(end)s) does not match StartTag (%(start)s)") % {"end": name, "start": start_name})
+                contentModelFlag = "PCDATA"
+
+            elif type == "Comment":
+                if contentModelFlag != "PCDATA":
+                    raise LintError(_("Comment not in PCDATA content model flag"))
+
+            elif type in ("Characters", "SpaceCharacters"):
+                data = token["data"]
+                if not isinstance(data, str):
+                    raise LintError(_("Attribute name is not a string: %(name)r") % {"name": data})
+                if not data:
+                    raise LintError(_("%(type)s token with empty data") % {"type": type})
+                if type == "SpaceCharacters":
+                    data = data.strip(spaceCharacters)
+                    if data:
+                        raise LintError(_("Non-space character(s) found in SpaceCharacters token: %(token)r") % {"token": data})
+
+            elif type == "Doctype":
+                name = token["name"]
+                if contentModelFlag != "PCDATA":
+                    raise LintError(_("Doctype not in PCDATA content model flag: %(name)s") % {"name": name})
+                if not isinstance(name, str):
+                    raise LintError(_("Tag name is not a string: %(tag)r") % {"tag": name})
+                # XXX: what to do with token["data"] ?
+
+            elif type in ("ParseError", "SerializeError"):
+                pass
+
+            else:
+                raise LintError(_("Unknown token type: %(type)s") % {"type": type})
+
+            yield token