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98 lines
3.5 KiB
Python
98 lines
3.5 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 re
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import sgmllib3k as sgmllib
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__all__ = [
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"sgmllib",
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"charref",
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"tagfind",
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"attrfind",
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"entityref",
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"incomplete",
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"interesting",
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"shorttag",
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"shorttagopen",
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"starttagopen",
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"endbracket",
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]
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# sgmllib defines a number of module-level regular expressions that are
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# insufficient for the XML parsing feedparser needs. Rather than modify
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# the variables directly in sgmllib, they're defined here using the same
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# names, and the compiled code objects of several sgmllib.SGMLParser
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# methods are copied into _BaseHTMLProcessor so that they execute in
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# feedparser's scope instead of sgmllib's scope.
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charref = re.compile(r"&#(\d+|[xX][0-9a-fA-F]+);")
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tagfind = re.compile(r"[a-zA-Z][-_.:a-zA-Z0-9]*")
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attrfind = re.compile(
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r"""\s*([a-zA-Z_][-:.a-zA-Z_0-9]*)[$]?(\s*=\s*"""
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r"""('[^']*'|"[^"]*"|[][\-a-zA-Z0-9./,:;+*%?!&$()_#=~'"@]*))?"""
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)
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# Unfortunately, these must be copied over to prevent NameError exceptions
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entityref = sgmllib.SGMLParser.entityref
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incomplete = sgmllib.SGMLParser.incomplete
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interesting = sgmllib.SGMLParser.interesting
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shorttag = sgmllib.SGMLParser.shorttag
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shorttagopen = sgmllib.SGMLParser.shorttagopen
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starttagopen = sgmllib.SGMLParser.starttagopen
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class _EndBracketRegEx:
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def __init__(self):
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# Overriding the built-in sgmllib.endbracket regex allows the
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# parser to find angle brackets embedded in element attributes.
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self.endbracket = re.compile(
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r"("
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r"""[^'"<>]"""
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r"""|"[^"]*"(?=>|/|\s|\w+=)"""
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r"""|'[^']*'(?=>|/|\s|\w+=))*(?=[<>])"""
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r"""|.*?(?=[<>]"""
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r")"
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)
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def search(self, target, index=0):
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match = self.endbracket.match(target, index)
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if match is not None:
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# Returning a new object in the calling thread's context
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# resolves a thread-safety issue.
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return EndBracketMatch(match)
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return None
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class EndBracketMatch:
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def __init__(self, match):
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self.match = match
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def start(self, n):
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return self.match.end(n)
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endbracket = _EndBracketRegEx()
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