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352 lines
11 KiB
Python
352 lines
11 KiB
Python
# Copyright 2010-2023 Kurt McKee <contactme@kurtmckee.org>
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# Copyright 2002-2008 Mark Pilgrim
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# All rights reserved.
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#
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# This file is a part of feedparser.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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import html.entities
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import re
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# These items must all be imported into this module due to .__code__ replacements.
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from .sgml import ( # noqa: F401
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attrfind,
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charref,
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endbracket,
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entityref,
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incomplete,
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interesting,
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sgmllib,
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shorttag,
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shorttagopen,
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starttagopen,
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tagfind,
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)
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_cp1252 = {
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128: "\u20ac", # euro sign
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130: "\u201a", # single low-9 quotation mark
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131: "\u0192", # latin small letter f with hook
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132: "\u201e", # double low-9 quotation mark
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133: "\u2026", # horizontal ellipsis
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134: "\u2020", # dagger
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135: "\u2021", # double dagger
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136: "\u02c6", # modifier letter circumflex accent
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137: "\u2030", # per mille sign
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138: "\u0160", # latin capital letter s with caron
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139: "\u2039", # single left-pointing angle quotation mark
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140: "\u0152", # latin capital ligature oe
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142: "\u017d", # latin capital letter z with caron
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145: "\u2018", # left single quotation mark
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146: "\u2019", # right single quotation mark
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147: "\u201c", # left double quotation mark
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148: "\u201d", # right double quotation mark
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149: "\u2022", # bullet
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150: "\u2013", # en dash
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151: "\u2014", # em dash
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152: "\u02dc", # small tilde
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153: "\u2122", # trade mark sign
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154: "\u0161", # latin small letter s with caron
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155: "\u203a", # single right-pointing angle quotation mark
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156: "\u0153", # latin small ligature oe
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158: "\u017e", # latin small letter z with caron
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159: "\u0178", # latin capital letter y with diaeresis
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}
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class BaseHTMLProcessor(sgmllib.SGMLParser):
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special = re.compile("""[<>'"]""")
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bare_ampersand = re.compile(r"&(?!#\d+;|#x[0-9a-fA-F]+;|\w+;)")
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elements_no_end_tag = {
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"area",
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"base",
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"basefont",
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"br",
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"col",
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"command",
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"embed",
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"frame",
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"hr",
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"img",
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"input",
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"isindex",
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"keygen",
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"link",
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"meta",
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"param",
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"source",
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"track",
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"wbr",
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}
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def __init__(self, encoding=None, _type="application/xhtml+xml"):
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if encoding:
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self.encoding = encoding
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self._type = _type
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self.pieces = []
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super().__init__()
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def reset(self):
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self.pieces = []
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super().reset()
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def _shorttag_replace(self, match):
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"""
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:type match: Match[str]
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:rtype: str
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"""
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tag = match.group(1)
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if tag in self.elements_no_end_tag:
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return "<" + tag + " />"
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else:
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return "<" + tag + "></" + tag + ">"
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# By declaring these methods and overriding their compiled code
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# with the code from sgmllib, the original code will execute in
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# feedparser's scope instead of sgmllib's. This means that the
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# `tagfind` and `charref` regular expressions will be found as
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# they're declared above, not as they're declared in sgmllib.
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def goahead(self, i):
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raise NotImplementedError
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# Replace goahead with SGMLParser's goahead() code object.
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goahead.__code__ = sgmllib.SGMLParser.goahead.__code__
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def __parse_starttag(self, i):
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raise NotImplementedError
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# Replace __parse_starttag with SGMLParser's parse_starttag() code object.
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__parse_starttag.__code__ = sgmllib.SGMLParser.parse_starttag.__code__
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def parse_starttag(self, i):
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j = self.__parse_starttag(i)
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if self._type == "application/xhtml+xml":
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if j > 2 and self.rawdata[j - 2 : j] == "/>":
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self.unknown_endtag(self.lasttag)
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return j
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def feed(self, data):
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"""
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:type data: str
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:rtype: None
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"""
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data = re.sub(r"<!((?!DOCTYPE|--|\[))", r"<!\1", data, flags=re.IGNORECASE)
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data = re.sub(r"<([^<>\s]+?)\s*/>", self._shorttag_replace, data)
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data = data.replace("'", "'")
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data = data.replace(""", '"')
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super().feed(data)
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super().close()
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@staticmethod
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def normalize_attrs(attrs):
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"""
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:type attrs: List[Tuple[str, str]]
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:rtype: List[Tuple[str, str]]
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"""
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if not attrs:
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return attrs
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# utility method to be called by descendants
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# Collapse any duplicate attribute names and values by converting
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# *attrs* into a dictionary, then convert it back to a list.
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attrs_d = {k.lower(): v for k, v in attrs}
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attrs = [
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(k, k in ("rel", "type") and v.lower() or v) for k, v in attrs_d.items()
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]
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attrs.sort()
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return attrs
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def unknown_starttag(self, tag, attrs):
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"""
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:type tag: str
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:type attrs: List[Tuple[str, str]]
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:rtype: None
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"""
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# Called for each start tag
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# attrs is a list of (attr, value) tuples
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# e.g. for <pre class='screen'>, tag='pre', attrs=[('class', 'screen')]
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uattrs = []
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strattrs = ""
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if attrs:
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for key, value in attrs:
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value = value.replace(">", ">")
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value = value.replace("<", "<")
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value = value.replace('"', """)
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value = self.bare_ampersand.sub("&", value)
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uattrs.append((key, value))
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strattrs = "".join(f' {key}="{value}"' for key, value in uattrs)
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if tag in self.elements_no_end_tag:
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self.pieces.append(f"<{tag}{strattrs} />")
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else:
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self.pieces.append(f"<{tag}{strattrs}>")
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def unknown_endtag(self, tag):
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"""
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:type tag: str
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:rtype: None
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"""
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# Called for each end tag, e.g. for </pre>, tag will be 'pre'
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# Reconstruct the original end tag.
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if tag not in self.elements_no_end_tag:
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self.pieces.append("</%s>" % tag)
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def handle_charref(self, ref):
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"""
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:type ref: str
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:rtype: None
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"""
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# Called for each character reference, e.g. ' ' will extract '160'
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# Reconstruct the original character reference.
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ref = ref.lower()
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if ref.startswith("x"):
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value = int(ref[1:], 16)
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else:
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value = int(ref)
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if value in _cp1252:
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self.pieces.append("&#%s;" % hex(ord(_cp1252[value]))[1:])
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else:
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self.pieces.append("&#%s;" % ref)
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def handle_entityref(self, ref):
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"""
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:type ref: str
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:rtype: None
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"""
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# Called for each entity reference, e.g. '©' will extract 'copy'
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# Reconstruct the original entity reference.
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if ref in html.entities.name2codepoint or ref == "apos":
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self.pieces.append("&%s;" % ref)
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else:
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self.pieces.append("&%s" % ref)
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def handle_data(self, text):
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"""
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:type text: str
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:rtype: None
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"""
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# called for each block of plain text, i.e. outside of any tag and
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# not containing any character or entity references
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# Store the original text verbatim.
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self.pieces.append(text)
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def handle_comment(self, text):
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"""
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:type text: str
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:rtype: None
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"""
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# Called for HTML comments, e.g. <!-- insert Javascript code here -->
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# Reconstruct the original comment.
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self.pieces.append("<!--%s-->" % text)
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def handle_pi(self, text):
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"""
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:type text: str
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:rtype: None
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"""
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# Called for each processing instruction, e.g. <?instruction>
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# Reconstruct original processing instruction.
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self.pieces.append("<?%s>" % text)
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def handle_decl(self, text):
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"""
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:type text: str
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:rtype: None
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"""
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# called for the DOCTYPE, if present, e.g.
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# <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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# "http://www.w3.org/TR/html4/loose.dtd">
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# Reconstruct original DOCTYPE
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self.pieces.append("<!%s>" % text)
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_new_declname_match = re.compile(r"[a-zA-Z][-_.a-zA-Z0-9:]*\s*").match
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def _scan_name(self, i, declstartpos):
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"""
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:type i: int
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:type declstartpos: int
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:rtype: Tuple[Optional[str], int]
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"""
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rawdata = self.rawdata
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n = len(rawdata)
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if i == n:
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return None, -1
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m = self._new_declname_match(rawdata, i)
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if m:
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s = m.group()
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name = s.strip()
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if (i + len(s)) == n:
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return None, -1 # end of buffer
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return name.lower(), m.end()
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else:
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self.handle_data(rawdata)
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# self.updatepos(declstartpos, i)
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return None, -1
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def convert_charref(self, name):
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"""
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:type name: str
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:rtype: str
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"""
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return "&#%s;" % name
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def convert_entityref(self, name):
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"""
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:type name: str
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:rtype: str
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"""
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return "&%s;" % name
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def output(self):
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"""Return processed HTML as a single string.
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:rtype: str
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"""
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return "".join(self.pieces)
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def parse_declaration(self, i):
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"""
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:type i: int
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:rtype: int
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"""
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try:
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return sgmllib.SGMLParser.parse_declaration(self, i)
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except (AssertionError, sgmllib.SGMLParseError):
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# Escape the doctype declaration and continue parsing.
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self.handle_data("<")
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return i + 1
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