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410 lines
15 KiB
Python
410 lines
15 KiB
Python
from __future__ import absolute_import, division, unicode_literals
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from six import text_type
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import re
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from codecs import register_error, xmlcharrefreplace_errors
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from .constants import voidElements, booleanAttributes, spaceCharacters
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from .constants import rcdataElements, entities, xmlEntities
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from . import treewalkers, _utils
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from xml.sax.saxutils import escape
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_quoteAttributeSpecChars = "".join(spaceCharacters) + "\"'=<>`"
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_quoteAttributeSpec = re.compile("[" + _quoteAttributeSpecChars + "]")
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_quoteAttributeLegacy = re.compile("[" + _quoteAttributeSpecChars +
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"\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n"
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"\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15"
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"\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
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"\x20\x2f\x60\xa0\u1680\u180e\u180f\u2000"
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"\u2001\u2002\u2003\u2004\u2005\u2006\u2007"
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"\u2008\u2009\u200a\u2028\u2029\u202f\u205f"
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"\u3000]")
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_encode_entity_map = {}
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_is_ucs4 = len("\U0010FFFF") == 1
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for k, v in list(entities.items()):
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# skip multi-character entities
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if ((_is_ucs4 and len(v) > 1) or
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(not _is_ucs4 and len(v) > 2)):
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continue
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if v != "&":
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if len(v) == 2:
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v = _utils.surrogatePairToCodepoint(v)
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else:
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v = ord(v)
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if v not in _encode_entity_map or k.islower():
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# prefer < over < and similarly for &, >, etc.
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_encode_entity_map[v] = k
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def htmlentityreplace_errors(exc):
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if isinstance(exc, (UnicodeEncodeError, UnicodeTranslateError)):
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res = []
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codepoints = []
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skip = False
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for i, c in enumerate(exc.object[exc.start:exc.end]):
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if skip:
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skip = False
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continue
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index = i + exc.start
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if _utils.isSurrogatePair(exc.object[index:min([exc.end, index + 2])]):
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codepoint = _utils.surrogatePairToCodepoint(exc.object[index:index + 2])
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skip = True
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else:
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codepoint = ord(c)
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codepoints.append(codepoint)
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for cp in codepoints:
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e = _encode_entity_map.get(cp)
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if e:
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res.append("&")
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res.append(e)
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if not e.endswith(";"):
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res.append(";")
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else:
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res.append("&#x%s;" % (hex(cp)[2:]))
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return ("".join(res), exc.end)
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else:
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return xmlcharrefreplace_errors(exc)
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register_error("htmlentityreplace", htmlentityreplace_errors)
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def serialize(input, tree="etree", encoding=None, **serializer_opts):
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"""Serializes the input token stream using the specified treewalker
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:arg input: the token stream to serialize
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:arg tree: the treewalker to use
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:arg encoding: the encoding to use
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:arg serializer_opts: any options to pass to the
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:py:class:`html5lib.serializer.HTMLSerializer` that gets created
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:returns: the tree serialized as a string
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Example:
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>>> from html5lib.html5parser import parse
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>>> from html5lib.serializer import serialize
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>>> token_stream = parse('<html><body><p>Hi!</p></body></html>')
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>>> serialize(token_stream, omit_optional_tags=False)
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'<html><head></head><body><p>Hi!</p></body></html>'
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"""
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# XXX: Should we cache this?
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walker = treewalkers.getTreeWalker(tree)
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s = HTMLSerializer(**serializer_opts)
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return s.render(walker(input), encoding)
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class HTMLSerializer(object):
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# attribute quoting options
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quote_attr_values = "legacy" # be secure by default
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quote_char = '"'
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use_best_quote_char = True
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# tag syntax options
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omit_optional_tags = True
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minimize_boolean_attributes = True
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use_trailing_solidus = False
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space_before_trailing_solidus = True
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# escaping options
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escape_lt_in_attrs = False
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escape_rcdata = False
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resolve_entities = True
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# miscellaneous options
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alphabetical_attributes = False
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inject_meta_charset = True
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strip_whitespace = False
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sanitize = False
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options = ("quote_attr_values", "quote_char", "use_best_quote_char",
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"omit_optional_tags", "minimize_boolean_attributes",
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"use_trailing_solidus", "space_before_trailing_solidus",
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"escape_lt_in_attrs", "escape_rcdata", "resolve_entities",
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"alphabetical_attributes", "inject_meta_charset",
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"strip_whitespace", "sanitize")
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def __init__(self, **kwargs):
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"""Initialize HTMLSerializer
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:arg inject_meta_charset: Whether or not to inject the meta charset.
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Defaults to ``True``.
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:arg quote_attr_values: Whether to quote attribute values that don't
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require quoting per legacy browser behavior (``"legacy"``), when
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required by the standard (``"spec"``), or always (``"always"``).
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Defaults to ``"legacy"``.
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:arg quote_char: Use given quote character for attribute quoting.
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Defaults to ``"`` which will use double quotes unless attribute
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value contains a double quote, in which case single quotes are
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used.
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:arg escape_lt_in_attrs: Whether or not to escape ``<`` in attribute
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values.
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Defaults to ``False``.
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:arg escape_rcdata: Whether to escape characters that need to be
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escaped within normal elements within rcdata elements such as
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style.
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Defaults to ``False``.
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:arg resolve_entities: Whether to resolve named character entities that
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appear in the source tree. The XML predefined entities < >
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& " ' are unaffected by this setting.
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Defaults to ``True``.
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:arg strip_whitespace: Whether to remove semantically meaningless
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whitespace. (This compresses all whitespace to a single space
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except within ``pre``.)
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Defaults to ``False``.
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:arg minimize_boolean_attributes: Shortens boolean attributes to give
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just the attribute value, for example::
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<input disabled="disabled">
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becomes::
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<input disabled>
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Defaults to ``True``.
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:arg use_trailing_solidus: Includes a close-tag slash at the end of the
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start tag of void elements (empty elements whose end tag is
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forbidden). E.g. ``<hr/>``.
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Defaults to ``False``.
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:arg space_before_trailing_solidus: Places a space immediately before
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the closing slash in a tag using a trailing solidus. E.g.
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``<hr />``. Requires ``use_trailing_solidus=True``.
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Defaults to ``True``.
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:arg sanitize: Strip all unsafe or unknown constructs from output.
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See :py:class:`html5lib.filters.sanitizer.Filter`.
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Defaults to ``False``.
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:arg omit_optional_tags: Omit start/end tags that are optional.
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Defaults to ``True``.
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:arg alphabetical_attributes: Reorder attributes to be in alphabetical order.
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Defaults to ``False``.
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"""
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unexpected_args = frozenset(kwargs) - frozenset(self.options)
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if len(unexpected_args) > 0:
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raise TypeError("__init__() got an unexpected keyword argument '%s'" % next(iter(unexpected_args)))
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if 'quote_char' in kwargs:
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self.use_best_quote_char = False
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for attr in self.options:
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setattr(self, attr, kwargs.get(attr, getattr(self, attr)))
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self.errors = []
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self.strict = False
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def encode(self, string):
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assert(isinstance(string, text_type))
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if self.encoding:
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return string.encode(self.encoding, "htmlentityreplace")
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else:
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return string
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def encodeStrict(self, string):
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assert(isinstance(string, text_type))
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if self.encoding:
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return string.encode(self.encoding, "strict")
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else:
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return string
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def serialize(self, treewalker, encoding=None):
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# pylint:disable=too-many-nested-blocks
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self.encoding = encoding
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in_cdata = False
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self.errors = []
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if encoding and self.inject_meta_charset:
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from .filters.inject_meta_charset import Filter
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treewalker = Filter(treewalker, encoding)
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# Alphabetical attributes is here under the assumption that none of
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# the later filters add or change order of attributes; it needs to be
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# before the sanitizer so escaped elements come out correctly
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if self.alphabetical_attributes:
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from .filters.alphabeticalattributes import Filter
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treewalker = Filter(treewalker)
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# WhitespaceFilter should be used before OptionalTagFilter
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# for maximum efficiently of this latter filter
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if self.strip_whitespace:
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from .filters.whitespace import Filter
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treewalker = Filter(treewalker)
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if self.sanitize:
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from .filters.sanitizer import Filter
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treewalker = Filter(treewalker)
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if self.omit_optional_tags:
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from .filters.optionaltags import Filter
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treewalker = Filter(treewalker)
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for token in treewalker:
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type = token["type"]
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if type == "Doctype":
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doctype = "<!DOCTYPE %s" % token["name"]
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if token["publicId"]:
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doctype += ' PUBLIC "%s"' % token["publicId"]
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elif token["systemId"]:
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doctype += " SYSTEM"
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if token["systemId"]:
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if token["systemId"].find('"') >= 0:
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if token["systemId"].find("'") >= 0:
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self.serializeError("System identifer contains both single and double quote characters")
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quote_char = "'"
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else:
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quote_char = '"'
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doctype += " %s%s%s" % (quote_char, token["systemId"], quote_char)
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doctype += ">"
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yield self.encodeStrict(doctype)
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elif type in ("Characters", "SpaceCharacters"):
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if type == "SpaceCharacters" or in_cdata:
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if in_cdata and token["data"].find("</") >= 0:
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self.serializeError("Unexpected </ in CDATA")
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yield self.encode(token["data"])
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else:
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yield self.encode(escape(token["data"]))
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elif type in ("StartTag", "EmptyTag"):
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name = token["name"]
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yield self.encodeStrict("<%s" % name)
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if name in rcdataElements and not self.escape_rcdata:
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in_cdata = True
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elif in_cdata:
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self.serializeError("Unexpected child element of a CDATA element")
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for (_, attr_name), attr_value in token["data"].items():
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# TODO: Add namespace support here
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k = attr_name
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v = attr_value
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yield self.encodeStrict(' ')
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yield self.encodeStrict(k)
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if not self.minimize_boolean_attributes or \
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(k not in booleanAttributes.get(name, tuple()) and
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k not in booleanAttributes.get("", tuple())):
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yield self.encodeStrict("=")
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if self.quote_attr_values == "always" or len(v) == 0:
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quote_attr = True
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elif self.quote_attr_values == "spec":
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quote_attr = _quoteAttributeSpec.search(v) is not None
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elif self.quote_attr_values == "legacy":
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quote_attr = _quoteAttributeLegacy.search(v) is not None
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else:
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raise ValueError("quote_attr_values must be one of: "
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"'always', 'spec', or 'legacy'")
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v = v.replace("&", "&")
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if self.escape_lt_in_attrs:
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v = v.replace("<", "<")
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if quote_attr:
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quote_char = self.quote_char
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if self.use_best_quote_char:
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if "'" in v and '"' not in v:
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quote_char = '"'
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elif '"' in v and "'" not in v:
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quote_char = "'"
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if quote_char == "'":
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v = v.replace("'", "'")
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else:
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v = v.replace('"', """)
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yield self.encodeStrict(quote_char)
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yield self.encode(v)
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yield self.encodeStrict(quote_char)
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else:
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yield self.encode(v)
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if name in voidElements and self.use_trailing_solidus:
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if self.space_before_trailing_solidus:
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yield self.encodeStrict(" /")
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else:
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yield self.encodeStrict("/")
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yield self.encode(">")
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elif type == "EndTag":
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name = token["name"]
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if name in rcdataElements:
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in_cdata = False
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elif in_cdata:
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self.serializeError("Unexpected child element of a CDATA element")
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yield self.encodeStrict("</%s>" % name)
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elif type == "Comment":
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data = token["data"]
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if data.find("--") >= 0:
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self.serializeError("Comment contains --")
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yield self.encodeStrict("<!--%s-->" % token["data"])
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elif type == "Entity":
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name = token["name"]
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key = name + ";"
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if key not in entities:
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self.serializeError("Entity %s not recognized" % name)
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if self.resolve_entities and key not in xmlEntities:
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data = entities[key]
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else:
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data = "&%s;" % name
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yield self.encodeStrict(data)
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else:
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self.serializeError(token["data"])
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def render(self, treewalker, encoding=None):
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"""Serializes the stream from the treewalker into a string
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:arg treewalker: the treewalker to serialize
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:arg encoding: the string encoding to use
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:returns: the serialized tree
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Example:
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>>> from html5lib import parse, getTreeWalker
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>>> from html5lib.serializer import HTMLSerializer
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>>> token_stream = parse('<html><body>Hi!</body></html>')
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>>> walker = getTreeWalker('etree')
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>>> serializer = HTMLSerializer(omit_optional_tags=False)
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>>> serializer.render(walker(token_stream))
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'<html><head></head><body>Hi!</body></html>'
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"""
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if encoding:
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return b"".join(list(self.serialize(treewalker, encoding)))
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else:
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return "".join(list(self.serialize(treewalker)))
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def serializeError(self, data="XXX ERROR MESSAGE NEEDED"):
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# XXX The idea is to make data mandatory.
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self.errors.append(data)
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if self.strict:
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raise SerializeError
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class SerializeError(Exception):
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"""Error in serialized tree"""
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pass
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