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serializer.py
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from __future__ import absolute_import, division, unicode_literals from six import text_type import re from codecs import register_error, xmlcharrefreplace_errors from .constants import voidElements, booleanAttributes, spaceCharacters from .constants import rcdataElements, entities, xmlEntities from . import treewalkers, _utils from xml.sax.saxutils import escape _quoteAttributeSpecChars = "".join(spaceCharacters) + "\"'=<>`" _quoteAttributeSpec = re.compile("[" + _quoteAttributeSpecChars + "]") _quoteAttributeLegacy = re.compile("[" + _quoteAttributeSpecChars + "\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n" "\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15" "\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" "\x20\x2f\x60\xa0\u1680\u180e\u180f\u2000" "\u2001\u2002\u2003\u2004\u2005\u2006\u2007" "\u2008\u2009\u200a\u2028\u2029\u202f\u205f" "\u3000]") _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 v not 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("htmlentityreplace", htmlentityreplace_errors) def serialize(input, tree="etree", encoding=None, **serializer_opts): """Serializes the input token stream using the specified treewalker :arg input: the token stream to serialize :arg tree: the treewalker to use :arg encoding: the encoding to use :arg serializer_opts: any options to pass to the :py:class:`html5lib.serializer.HTMLSerializer` that gets created :returns: the tree serialized as a string Example: >>> from html5lib.html5parser import parse >>> from html5lib.serializer import serialize >>> token_stream = parse('<html><body><p>Hi!</p></body></html>') >>> serialize(token_stream, omit_optional_tags=False) '<html><head></head><body><p>Hi!</p></body></html>' """ # XXX: Should we cache this? walker = treewalkers.getTreeWalker(tree) s = HTMLSerializer(**serializer_opts) return s.render(walker(input), encoding) class HTMLSerializer(object): # attribute quoting options quote_attr_values = "legacy" # be secure by default 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 :arg inject_meta_charset: Whether or not to inject the meta charset. Defaults to ``True``. :arg quote_attr_values: Whether to quote attribute values that don't require quoting per legacy browser behavior (``"legacy"``), when required by the standard (``"spec"``), or always (``"always"``). Defaults to ``"legacy"``. :arg quote_char: Use given quote character for attribute quoting. Defaults to ``"`` which will use double quotes unless attribute value contains a double quote, in which case single quotes are used. :arg escape_lt_in_attrs: Whether or not to escape ``<`` in attribute values. Defaults to ``False``. :arg escape_rcdata: Whether to escape characters that need to be escaped within normal elements within rcdata elements such as style. Defaults to ``False``. :arg resolve_entities: Whether to resolve named character entities that appear in the source tree. The XML predefined entities < > & " ' are unaffected by this setting. Defaults to ``True``. :arg strip_whitespace: Whether to remove semantically meaningless whitespace. (This compresses all whitespace to a single space except within ``pre``.) Defaults to ``False``. :arg minimize_boolean_attributes: Shortens boolean attributes to give just the attribute value, for example:: <input disabled="disabled"> becomes:: <input disabled> Defaults to ``True``. :arg use_trailing_solidus: 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/>``. Defaults to ``False``. :arg space_before_trailing_solidus: Places a space immediately before the closing slash in a tag using a trailing solidus. E.g. ``<hr />``. Requires ``use_trailing_solidus=True``. Defaults to ``True``. :arg sanitize: Strip all unsafe or unknown constructs from output. See :py:class:`html5lib.filters.sanitizer.Filter`. Defaults to ``False``. :arg omit_optional_tags: Omit start/end tags that are optional. Defaults to ``True``. :arg alphabetical_attributes: Reorder attributes to be in alphabetical order. Defaults to ``False``. """ unexpected_args = frozenset(kwargs) - frozenset(self.options) if len(unexpected_args) > 0: raise TypeError("__init__() got an unexpected keyword argument '%s'" % next(iter(unexpected_args))) 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, "htmlentityreplace") 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): # pylint:disable=too-many-nested-blocks 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) # Alphabetical attributes is here under the assumption that none of # the later filters add or change order of attributes; it needs to be # before the sanitizer so escaped elements come out correctly if self.alphabetical_attributes: from .filters.alphabeticalattributes import Filter treewalker = Filter(treewalker) # 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) 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_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 == "always" or len(v) == 0: quote_attr = True elif self.quote_attr_values == "spec": quote_attr = _quoteAttributeSpec.search(v) is not None elif self.quote_attr_values == "legacy": quote_attr = _quoteAttributeLegacy.search(v) is not None else: raise ValueError("quote_attr_values must be one of: " "'always', 'spec', or 'legacy'") 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 key not 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): """Serializes the stream from the treewalker into a string :arg treewalker: the treewalker to serialize :arg encoding: the string encoding to use :returns: the serialized tree Example: >>> from html5lib import parse, getTreeWalker >>> from html5lib.serializer import HTMLSerializer >>> token_stream = parse('<html><body>Hi!</body></html>') >>> walker = getTreeWalker('etree') >>> serializer = HTMLSerializer(omit_optional_tags=False) >>> serializer.render(walker(token_stream)) '<html><head></head><body>Hi!</body></html>' """ 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 class SerializeError(Exception): """Error in serialized tree""" pass