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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: %s") % name)
if not isinstance(name, str):
raise LintError(_("Tag name is not a string: %r") % name)
if not name:
raise LintError(_("Empty tag name"))
if type == "StartTag" and name in voidElements:
raise LintError(_("Void element reported as StartTag token: %s") % name)
elif type == "EmptyTag" and name not in voidElements:
raise LintError(_("Non-void element reported as EmptyTag token: %s") % 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: %r") % name)
if not name:
raise LintError(_("Empty attribute name"))
if not isinstance(value, str):
raise LintError(_("Attribute value is not a string: %r") % 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: %r") % name)
if not name:
raise LintError(_("Empty tag name"))
if name in voidElements:
raise LintError(_("Void element reported as EndTag token: %s") % name)
start_name = open_elements.pop()
if start_name != name:
raise LintError(_("EndTag (%s) does not match StartTag (%s)") % (name, 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: %r") % data)
if not data:
raise LintError(_("%s token with empty data") % type)
if type == "SpaceCharacters":
data = data.strip(spaceCharacters)
if data:
raise LintError(_("Non-space character(s) found in SpaceCharacters token: ") % data)
elif type == "Doctype":
name = token["name"]
if contentModelFlag != "PCDATA":
raise LintError(_("Doctype not in PCDATA content model flag: %s") % name)
if not isinstance(name, str):
raise LintError(_("Tag name is not a string: %r") % name)
# XXX: what to do with token["data"] ?
elif type in ("ParseError", "SerializeError"):
pass
else:
raise LintError(_("Unknown token type: %s") % type)
yield token
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