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	__init__.py — 4.64 KB 2025-10-31 18:40 · rw-r--r--	4.64 KB	2025-10-31 18:40	rw-r--r--
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	parser.py — 20.7 KB 2025-10-31 18:40 · rw-r--r--	20.7 KB	2025-10-31 18:40	rw-r--r--

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"""A parser for HTML and XHTML.""" # This file is based on sgmllib.py, but the API is slightly different. # XXX There should be a way to distinguish between PCDATA (parsed # character data -- the normal case), RCDATA (replaceable character # data -- only char and entity references and end tags are special) # and CDATA (character data -- only end tags are special). import re import _markupbase from html import unescape __all__ = ['HTMLParser'] # Regular expressions used for parsing interesting_normal = re.compile('[&<]') incomplete = re.compile('&[a-zA-Z#]') entityref = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*)[^a-zA-Z0-9]') charref = re.compile('&#(?:[0-9]+|[xX][0-9a-fA-F]+)[^0-9a-fA-F]') starttagopen = re.compile('<[a-zA-Z]') endtagopen = re.compile('') commentclose = re.compile(r'--!?>') commentabruptclose = re.compile(r'-?>') # Note: # 1) if you change tagfind/attrfind remember to update locatetagend too; # 2) if you change tagfind/attrfind and/or locatetagend the parser will # explode, so don't do it. # see the HTML5 specs section "13.2.5.6 Tag open state", # "13.2.5.8 Tag name state" and "13.2.5.33 Attribute name state". # https://html.spec.whatwg.org/multipage/parsing.html#tag-open-state # https://html.spec.whatwg.org/multipage/parsing.html#tag-name-state # https://html.spec.whatwg.org/multipage/parsing.html#attribute-name-state tagfind_tolerant = re.compile(r'([a-zA-Z][^\t\n\r\f />]*)(?:[\t\n\r\f ]|/(?!>))*') attrfind_tolerant = re.compile(r""" ( (?<=['"\t\n\r\f /])[^\t\n\r\f />][^\t\n\r\f /=>]* # attribute name ) ([\t\n\r\f ]*=[\t\n\r\f ]* # value indicator ('[^']*' # LITA-enclosed value |"[^"]*" # LIT-enclosed value |(?!['"])[^>\t\n\r\f ]* # bare value ) )? (?:[\t\n\r\f ]|/(?!>))* # possibly followed by a space """, re.VERBOSE) locatetagend = re.compile(r""" [a-zA-Z][^\t\n\r\f />]* # tag name [\t\n\r\f /]* # optional whitespace before attribute name (?:(?<=['"\t\n\r\f /])[^\t\n\r\f />][^\t\n\r\f /=>]* # attribute name (?:[\t\n\r\f ]*=[\t\n\r\f ]* # value indicator (?:'[^']*' # LITA-enclosed value |"[^"]*" # LIT-enclosed value |(?!['"])[^>\t\n\r\f ]* # bare value ) )? [\t\n\r\f /]* # possibly followed by a space )* >? """, re.VERBOSE) # The following variables are not used, but are temporarily left for # backward compatibility. locatestarttagend_tolerant = re.compile(r""" <[a-zA-Z][^\t\n\r\f />\x00]* # tag name (?:[\s/]* # optional whitespace before attribute name (?:(?<=['"\s/])[^\s/>][^\s/=>]* # attribute name (?:\s*=+\s* # value indicator (?:'[^']*' # LITA-enclosed value |"[^"]*" # LIT-enclosed value |(?!['"])[^>\s]* # bare value ) \s* # possibly followed by a space )?(?:\s|/(?!>))* )* )? \s* # trailing whitespace """, re.VERBOSE) endendtag = re.compile('>') endtagfind = re.compile(r'') class HTMLParser(_markupbase.ParserBase): """Find tags and other markup and call handler functions. Usage: p = HTMLParser() p.feed(data) ... p.close() Start tags are handled by calling self.handle_starttag() or self.handle_startendtag(); end tags by self.handle_endtag(). The data between tags is passed from the parser to the derived class by calling self.handle_data() with the data as argument (the data may be split up in arbitrary chunks). If convert_charrefs is True the character references are converted automatically to the corresponding Unicode character (and self.handle_data() is no longer split in chunks), otherwise they are passed by calling self.handle_entityref() or self.handle_charref() with the string containing respectively the named or numeric reference as the argument. """ # See the HTML5 specs section "13.4 Parsing HTML fragments". # https://html.spec.whatwg.org/multipage/parsing.html#parsing-html-fragments # CDATA_CONTENT_ELEMENTS are parsed in RAWTEXT mode CDATA_CONTENT_ELEMENTS = ("script", "style", "xmp", "iframe", "noembed", "noframes") RCDATA_CONTENT_ELEMENTS = ("textarea", "title") def __init__(self, *, convert_charrefs=True, scripting=False): """Initialize and reset this instance. If convert_charrefs is true (the default), all character references are automatically converted to the corresponding Unicode characters. If *scripting* is false (the default), the content of the ``noscript`` element is parsed normally; if it's true, it's returned as is without being parsed. """ self.convert_charrefs = convert_charrefs self.scripting = scripting self.reset() def reset(self): """Reset this instance. Loses all unprocessed data.""" self.rawdata = '' self.lasttag = '???' self.interesting = interesting_normal self.cdata_elem = None self._support_cdata = True self._escapable = True _markupbase.ParserBase.reset(self) def feed(self, data): r"""Feed data to the parser. Call this as often as you want, with as little or as much text as you want (may include '\n'). """ self.rawdata = self.rawdata + data self.goahead(0) def close(self): """Handle any buffered data.""" self.goahead(1) __starttag_text = None def get_starttag_text(self): """Return full source of start tag: '<...>'.""" return self.__starttag_text def set_cdata_mode(self, elem, *, escapable=False): self.cdata_elem = elem.lower() self._escapable = escapable if self.cdata_elem == 'plaintext': self.interesting = re.compile(r'\Z') elif escapable and not self.convert_charrefs: self.interesting = re.compile(r'&|])' % self.cdata_elem, re.IGNORECASE|re.ASCII) else: self.interesting = re.compile(r'])' % self.cdata_elem, re.IGNORECASE|re.ASCII) def clear_cdata_mode(self): self.interesting = interesting_normal self.cdata_elem = None self._escapable = True def _set_support_cdata(self, flag=True): """Enable or disable support of the CDATA sections. If enabled, "<[CDATA[" starts a CDATA section which ends with "]]>". If disabled, "<[CDATA[" starts a bogus comments which ends with ">". This method is not called by default. Its purpose is to be called in custom handle_starttag() and handle_endtag() methods, with value that depends on the adjusted current node. See https://html.spec.whatwg.org/multipage/parsing.html#markup-declaration-open-state for details. """ self._support_cdata = flag # Internal -- handle data as far as reasonable. May leave state # and data to be processed by a subsequent call. If 'end' is # true, force handling all data as if followed by EOF marker. def goahead(self, end): rawdata = self.rawdata i = 0 n = len(rawdata) while i < n: if self.convert_charrefs and not self.cdata_elem: j = rawdata.find('<', i) if j < 0: # if we can't find the next <, either we are at the end # or there's more text incoming. If the latter is True, # we can't pass the text to handle_data in case we have # a charref cut in half at end. Try to determine if # this is the case before proceeding by looking for an # & near the end and see if it's followed by a space or ;. amppos = rawdata.rfind('&', max(i, n-34)) if (amppos >= 0 and not re.compile(r'[\t\n\r\f ;]').search(rawdata, amppos)): break # wait till we get all the text j = n else: match = self.interesting.search(rawdata, i) # < or & if match: j = match.start() else: if self.cdata_elem: break j = n if i < j: if self.convert_charrefs and self._escapable: self.handle_data(unescape(rawdata[i:j])) else: self.handle_data(rawdata[i:j]) i = self.updatepos(i, j) if i == n: break startswith = rawdata.startswith if startswith('<', i): if starttagopen.match(rawdata, i): # < + letter k = self.parse_starttag(i) elif startswith("', i+9) if j < 0: return -1 self.unknown_decl(rawdata[i+3: j]) return j + 3 elif rawdata[i:i+9].lower() == ' gtpos = rawdata.find('>', i+9) if gtpos == -1: return -1 self.handle_decl(rawdata[i+2:gtpos]) return gtpos+1 elif rawdata[i:i+3] == '', i+3) if j < 0: return -1 if rawdata[j-1] == ']': self.unknown_decl(rawdata[i+3: j-1]) else: self.handle_comment(rawdata[i+2: j]) return j + 1 else: return self.parse_bogus_comment(i) # Internal -- parse comment, return length or -1 if not terminated # see https://html.spec.whatwg.org/multipage/parsing.html#comment-start-state def parse_comment(self, i, report=True): rawdata = self.rawdata assert rawdata.startswith('