321 lines
13 KiB
Python
321 lines
13 KiB
Python
|
from __future__ import absolute_import, division, unicode_literals
|
||
|
|
from six import text_type
|
||
|
|
|
||
|
|
import gettext
|
||
|
|
_ = gettext.gettext
|
||
|
|
|
||
|
|
try:
|
||
|
|
from functools import reduce
|
||
|
|
except ImportError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
from ..constants import voidElements, booleanAttributes, spaceCharacters
|
||
|
|
from ..constants import rcdataElements, entities, xmlEntities
|
||
|
|
from .. import utils
|
||
|
|
from xml.sax.saxutils import escape
|
||
|
|
|
||
|
|
spaceCharacters = "".join(spaceCharacters)
|
||
|
|
|
||
|
|
try:
|
||
|
|
from codecs import register_error, xmlcharrefreplace_errors
|
||
|
|
except ImportError:
|
||
|
|
unicode_encode_errors = "strict"
|
||
|
|
else:
|
||
|
|
unicode_encode_errors = "htmlentityreplace"
|
||
|
|
|
||
|
|
encode_entity_map = {}
|
||
|
|
is_ucs4 = len("\U0010FFFF") == 1
|
||
|
|
for k, v in list(entities.items()):
|
||
|
|
# skip multi-character entities
|
||
|
|
if ((is_ucs4 and len(v) > 1) or
|
||
|
|
(not is_ucs4 and len(v) > 2)):
|
||
|
|
continue
|
||
|
|
if v != "&":
|
||
|
|
if len(v) == 2:
|
||
|
|
v = utils.surrogatePairToCodepoint(v)
|
||
|
|
else:
|
||
|
|
v = ord(v)
|
||
|
|
if not v in encode_entity_map or k.islower():
|
||
|
|
# prefer < over < and similarly for &, >, etc.
|
||
|
|
encode_entity_map[v] = k
|
||
|
|
|
||
|
|
def htmlentityreplace_errors(exc):
|
||
|
|
if isinstance(exc, (UnicodeEncodeError, UnicodeTranslateError)):
|
||
|
|
res = []
|
||
|
|
codepoints = []
|
||
|
|
skip = False
|
||
|
|
for i, c in enumerate(exc.object[exc.start:exc.end]):
|
||
|
|
if skip:
|
||
|
|
skip = False
|
||
|
|
continue
|
||
|
|
index = i + exc.start
|
||
|
|
if utils.isSurrogatePair(exc.object[index:min([exc.end, index + 2])]):
|
||
|
|
codepoint = utils.surrogatePairToCodepoint(exc.object[index:index + 2])
|
||
|
|
skip = True
|
||
|
|
else:
|
||
|
|
codepoint = ord(c)
|
||
|
|
codepoints.append(codepoint)
|
||
|
|
for cp in codepoints:
|
||
|
|
e = encode_entity_map.get(cp)
|
||
|
|
if e:
|
||
|
|
res.append("&")
|
||
|
|
res.append(e)
|
||
|
|
if not e.endswith(";"):
|
||
|
|
res.append(";")
|
||
|
|
else:
|
||
|
|
res.append("&#x%s;" % (hex(cp)[2:]))
|
||
|
|
return ("".join(res), exc.end)
|
||
|
|
else:
|
||
|
|
return xmlcharrefreplace_errors(exc)
|
||
|
|
|
||
|
|
register_error(unicode_encode_errors, htmlentityreplace_errors)
|
||
|
|
|
||
|
|
del register_error
|
||
|
|
|
||
|
|
|
||
|
|
class HTMLSerializer(object):
|
||
|
|
|
||
|
|
# attribute quoting options
|
||
|
|
quote_attr_values = False
|
||
|
|
quote_char = '"'
|
||
|
|
use_best_quote_char = True
|
||
|
|
|
||
|
|
# tag syntax options
|
||
|
|
omit_optional_tags = True
|
||
|
|
minimize_boolean_attributes = True
|
||
|
|
use_trailing_solidus = False
|
||
|
|
space_before_trailing_solidus = True
|
||
|
|
|
||
|
|
# escaping options
|
||
|
|
escape_lt_in_attrs = False
|
||
|
|
escape_rcdata = False
|
||
|
|
resolve_entities = True
|
||
|
|
|
||
|
|
# miscellaneous options
|
||
|
|
alphabetical_attributes = False
|
||
|
|
inject_meta_charset = True
|
||
|
|
strip_whitespace = False
|
||
|
|
sanitize = False
|
||
|
|
|
||
|
|
options = ("quote_attr_values", "quote_char", "use_best_quote_char",
|
||
|
|
"omit_optional_tags", "minimize_boolean_attributes",
|
||
|
|
"use_trailing_solidus", "space_before_trailing_solidus",
|
||
|
|
"escape_lt_in_attrs", "escape_rcdata", "resolve_entities",
|
||
|
|
"alphabetical_attributes", "inject_meta_charset",
|
||
|
|
"strip_whitespace", "sanitize")
|
||
|
|
|
||
|
|
def __init__(self, **kwargs):
|
||
|
|
"""Initialize HTMLSerializer.
|
||
|
|
|
||
|
|
Keyword options (default given first unless specified) include:
|
||
|
|
|
||
|
|
inject_meta_charset=True|False
|
||
|
|
Whether it insert a meta element to define the character set of the
|
||
|
|
document.
|
||
|
|
quote_attr_values=True|False
|
||
|
|
Whether to quote attribute values that don't require quoting
|
||
|
|
per HTML5 parsing rules.
|
||
|
|
quote_char=u'"'|u"'"
|
||
|
|
Use given quote character for attribute quoting. Default is to
|
||
|
|
use double quote unless attribute value contains a double quote,
|
||
|
|
in which case single quotes are used instead.
|
||
|
|
escape_lt_in_attrs=False|True
|
||
|
|
Whether to escape < in attribute values.
|
||
|
|
escape_rcdata=False|True
|
||
|
|
Whether to escape characters that need to be escaped within normal
|
||
|
|
elements within rcdata elements such as style.
|
||
|
|
resolve_entities=True|False
|
||
|
|
Whether to resolve named character entities that appear in the
|
||
|
|
source tree. The XML predefined entities < > & " '
|
||
|
|
are unaffected by this setting.
|
||
|
|
strip_whitespace=False|True
|
||
|
|
Whether to remove semantically meaningless whitespace. (This
|
||
|
|
compresses all whitespace to a single space except within pre.)
|
||
|
|
minimize_boolean_attributes=True|False
|
||
|
|
Shortens boolean attributes to give just the attribute value,
|
||
|
|
for example <input disabled="disabled"> becomes <input disabled>.
|
||
|
|
use_trailing_solidus=False|True
|
||
|
|
Includes a close-tag slash at the end of the start tag of void
|
||
|
|
elements (empty elements whose end tag is forbidden). E.g. <hr/>.
|
||
|
|
space_before_trailing_solidus=True|False
|
||
|
|
Places a space immediately before the closing slash in a tag
|
||
|
|
using a trailing solidus. E.g. <hr />. Requires use_trailing_solidus.
|
||
|
|
sanitize=False|True
|
||
|
|
Strip all unsafe or unknown constructs from output.
|
||
|
|
See `html5lib user documentation`_
|
||
|
|
omit_optional_tags=True|False
|
||
|
|
Omit start/end tags that are optional.
|
||
|
|
alphabetical_attributes=False|True
|
||
|
|
Reorder attributes to be in alphabetical order.
|
||
|
|
|
||
|
|
.. _html5lib user documentation: http://code.google.com/p/html5lib/wiki/UserDocumentation
|
||
|
|
"""
|
||
|
|
if 'quote_char' in kwargs:
|
||
|
|
self.use_best_quote_char = False
|
||
|
|
for attr in self.options:
|
||
|
|
setattr(self, attr, kwargs.get(attr, getattr(self, attr)))
|
||
|
|
self.errors = []
|
||
|
|
self.strict = False
|
||
|
|
|
||
|
|
def encode(self, string):
|
||
|
|
assert(isinstance(string, text_type))
|
||
|
|
if self.encoding:
|
||
|
|
return string.encode(self.encoding, unicode_encode_errors)
|
||
|
|
else:
|
||
|
|
return string
|
||
|
|
|
||
|
|
def encodeStrict(self, string):
|
||
|
|
assert(isinstance(string, text_type))
|
||
|
|
if self.encoding:
|
||
|
|
return string.encode(self.encoding, "strict")
|
||
|
|
else:
|
||
|
|
return string
|
||
|
|
|
||
|
|
def serialize(self, treewalker, encoding=None):
|
||
|
|
self.encoding = encoding
|
||
|
|
in_cdata = False
|
||
|
|
self.errors = []
|
||
|
|
|
||
|
|
if encoding and self.inject_meta_charset:
|
||
|
|
from ..filters.inject_meta_charset import Filter
|
||
|
|
treewalker = Filter(treewalker, encoding)
|
||
|
|
# WhitespaceFilter should be used before OptionalTagFilter
|
||
|
|
# for maximum efficiently of this latter filter
|
||
|
|
if self.strip_whitespace:
|
||
|
|
from ..filters.whitespace import Filter
|
||
|
|
treewalker = Filter(treewalker)
|
||
|
|
if self.sanitize:
|
||
|
|
from ..filters.sanitizer import Filter
|
||
|
|
treewalker = Filter(treewalker)
|
||
|
|
if self.omit_optional_tags:
|
||
|
|
from ..filters.optionaltags import Filter
|
||
|
|
treewalker = Filter(treewalker)
|
||
|
|
# Alphabetical attributes must be last, as other filters
|
||
|
|
# could add attributes and alter the order
|
||
|
|
if self.alphabetical_attributes:
|
||
|
|
from ..filters.alphabeticalattributes import Filter
|
||
|
|
treewalker = Filter(treewalker)
|
||
|
|
|
||
|
|
for token in treewalker:
|
||
|
|
type = token["type"]
|
||
|
|
if type == "Doctype":
|
||
|
|
doctype = "<!DOCTYPE %s" % token["name"]
|
||
|
|
|
||
|
|
if token["publicId"]:
|
||
|
|
doctype += ' PUBLIC "%s"' % token["publicId"]
|
||
|
|
elif token["systemId"]:
|
||
|
|
doctype += " SYSTEM"
|
||
|
|
if token["systemId"]:
|
||
|
|
if token["systemId"].find('"') >= 0:
|
||
|
|
if token["systemId"].find("'") >= 0:
|
||
|
|
self.serializeError(_("System identifer contains both single and double quote characters"))
|
||
|
|
quote_char = "'"
|
||
|
|
else:
|
||
|
|
quote_char = '"'
|
||
|
|
doctype += " %s%s%s" % (quote_char, token["systemId"], quote_char)
|
||
|
|
|
||
|
|
doctype += ">"
|
||
|
|
yield self.encodeStrict(doctype)
|
||
|
|
|
||
|
|
elif type in ("Characters", "SpaceCharacters"):
|
||
|
|
if type == "SpaceCharacters" or in_cdata:
|
||
|
|
if in_cdata and token["data"].find("</") >= 0:
|
||
|
|
self.serializeError(_("Unexpected </ in CDATA"))
|
||
|
|
yield self.encode(token["data"])
|
||
|
|
else:
|
||
|
|
yield self.encode(escape(token["data"]))
|
||
|
|
|
||
|
|
elif type in ("StartTag", "EmptyTag"):
|
||
|
|
name = token["name"]
|
||
|
|
yield self.encodeStrict("<%s" % name)
|
||
|
|
if name in rcdataElements and not self.escape_rcdata:
|
||
|
|
in_cdata = True
|
||
|
|
elif in_cdata:
|
||
|
|
self.serializeError(_("Unexpected child element of a CDATA element"))
|
||
|
|
for (attr_namespace, attr_name), attr_value in token["data"].items():
|
||
|
|
# TODO: Add namespace support here
|
||
|
|
k = attr_name
|
||
|
|
v = attr_value
|
||
|
|
yield self.encodeStrict(' ')
|
||
|
|
|
||
|
|
yield self.encodeStrict(k)
|
||
|
|
if not self.minimize_boolean_attributes or \
|
||
|
|
(k not in booleanAttributes.get(name, tuple())
|
||
|
|
and k not in booleanAttributes.get("", tuple())):
|
||
|
|
yield self.encodeStrict("=")
|
||
|
|
if self.quote_attr_values or not v:
|
||
|
|
quote_attr = True
|
||
|
|
else:
|
||
|
|
quote_attr = reduce(lambda x, y: x or (y in v),
|
||
|
|
spaceCharacters + ">\"'=", False)
|
||
|
|
v = v.replace("&", "&")
|
||
|
|
if self.escape_lt_in_attrs:
|
||
|
|
v = v.replace("<", "<")
|
||
|
|
if quote_attr:
|
||
|
|
quote_char = self.quote_char
|
||
|
|
if self.use_best_quote_char:
|
||
|
|
if "'" in v and '"' not in v:
|
||
|
|
quote_char = '"'
|
||
|
|
elif '"' in v and "'" not in v:
|
||
|
|
quote_char = "'"
|
||
|
|
if quote_char == "'":
|
||
|
|
v = v.replace("'", "'")
|
||
|
|
else:
|
||
|
|
v = v.replace('"', """)
|
||
|
|
yield self.encodeStrict(quote_char)
|
||
|
|
yield self.encode(v)
|
||
|
|
yield self.encodeStrict(quote_char)
|
||
|
|
else:
|
||
|
|
yield self.encode(v)
|
||
|
|
if name in voidElements and self.use_trailing_solidus:
|
||
|
|
if self.space_before_trailing_solidus:
|
||
|
|
yield self.encodeStrict(" /")
|
||
|
|
else:
|
||
|
|
yield self.encodeStrict("/")
|
||
|
|
yield self.encode(">")
|
||
|
|
|
||
|
|
elif type == "EndTag":
|
||
|
|
name = token["name"]
|
||
|
|
if name in rcdataElements:
|
||
|
|
in_cdata = False
|
||
|
|
elif in_cdata:
|
||
|
|
self.serializeError(_("Unexpected child element of a CDATA element"))
|
||
|
|
yield self.encodeStrict("</%s>" % name)
|
||
|
|
|
||
|
|
elif type == "Comment":
|
||
|
|
data = token["data"]
|
||
|
|
if data.find("--") >= 0:
|
||
|
|
self.serializeError(_("Comment contains --"))
|
||
|
|
yield self.encodeStrict("<!--%s-->" % token["data"])
|
||
|
|
|
||
|
|
elif type == "Entity":
|
||
|
|
name = token["name"]
|
||
|
|
key = name + ";"
|
||
|
|
if not key in entities:
|
||
|
|
self.serializeError(_("Entity %s not recognized" % name))
|
||
|
|
if self.resolve_entities and key not in xmlEntities:
|
||
|
|
data = entities[key]
|
||
|
|
else:
|
||
|
|
data = "&%s;" % name
|
||
|
|
yield self.encodeStrict(data)
|
||
|
|
|
||
|
|
else:
|
||
|
|
self.serializeError(token["data"])
|
||
|
|
|
||
|
|
def render(self, treewalker, encoding=None):
|
||
|
|
if encoding:
|
||
|
|
return b"".join(list(self.serialize(treewalker, encoding)))
|
||
|
|
else:
|
||
|
|
return "".join(list(self.serialize(treewalker)))
|
||
|
|
|
||
|
|
def serializeError(self, data="XXX ERROR MESSAGE NEEDED"):
|
||
|
|
# XXX The idea is to make data mandatory.
|
||
|
|
self.errors.append(data)
|
||
|
|
if self.strict:
|
||
|
|
raise SerializeError
|
||
|
|
|
||
|
|
|
||
|
|
def SerializeError(Exception):
|
||
|
|
"""Error in serialized tree"""
|
||
|
|
pass
|