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-rw-r--r--lib/python2.7/HTMLParser.py472
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diff --git a/lib/python2.7/HTMLParser.py b/lib/python2.7/HTMLParser.py
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--- a/lib/python2.7/HTMLParser.py
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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 markupbase
-import re
-
-# 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]')
-piclose = re.compile('>')
-commentclose = re.compile(r'--\s*>')
-tagfind = re.compile('([a-zA-Z][-.a-zA-Z0-9:_]*)(?:\s|/(?!>))*')
-# see http://www.w3.org/TR/html5/tokenization.html#tag-open-state
-# and http://www.w3.org/TR/html5/tokenization.html#tag-name-state
-tagfind_tolerant = re.compile('[a-zA-Z][^\t\n\r\f />\x00]*')
-
-attrfind = re.compile(
- r'((?<=[\'"\s/])[^\s/>][^\s/=>]*)(\s*=+\s*'
- r'(\'[^\']*\'|"[^"]*"|(?![\'"])[^>\s]*))?(?:\s|/(?!>))*')
-
-locatestarttagend = re.compile(r"""
- <[a-zA-Z][-.a-zA-Z0-9:_]* # 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|/(?!>))*
- )*
- )?
- \s* # trailing whitespace
-""", re.VERBOSE)
-endendtag = re.compile('>')
-# the HTML 5 spec, section 8.1.2.2, doesn't allow spaces between
-# </ and the tag name, so maybe this should be fixed
-endtagfind = re.compile('</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')
-
-
-class HTMLParseError(Exception):
- """Exception raised for all parse errors."""
-
- def __init__(self, msg, position=(None, None)):
- assert msg
- self.msg = msg
- self.lineno = position[0]
- self.offset = position[1]
-
- def __str__(self):
- result = self.msg
- if self.lineno is not None:
- result = result + ", at line %d" % self.lineno
- if self.offset is not None:
- result = result + ", column %d" % (self.offset + 1)
- return result
-
-
-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). Entity references are
- passed by calling self.handle_entityref() with the entity
- reference as the argument. Numeric character references are
- passed to self.handle_charref() with the string containing the
- reference as the argument.
- """
-
- CDATA_CONTENT_ELEMENTS = ("script", "style")
-
-
- def __init__(self):
- """Initialize and reset this instance."""
- self.reset()
-
- def reset(self):
- """Reset this instance. Loses all unprocessed data."""
- self.rawdata = ''
- self.lasttag = '???'
- self.interesting = interesting_normal
- self.cdata_elem = None
- 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)
-
- def error(self, message):
- raise HTMLParseError(message, self.getpos())
-
- __starttag_text = None
-
- def get_starttag_text(self):
- """Return full source of start tag: '<...>'."""
- return self.__starttag_text
-
- def set_cdata_mode(self, elem):
- self.cdata_elem = elem.lower()
- self.interesting = re.compile(r'</\s*%s\s*>' % self.cdata_elem, re.I)
-
- def clear_cdata_mode(self):
- self.interesting = interesting_normal
- self.cdata_elem = None
-
- # 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:
- match = self.interesting.search(rawdata, i) # < or &
- if match:
- j = match.start()
- else:
- if self.cdata_elem:
- break
- j = n
- if i < j: 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):
- k = self.parse_endtag(i)
- elif startswith("<!--", i):
- k = self.parse_comment(i)
- elif startswith("<?", i):
- k = self.parse_pi(i)
- elif startswith("<!", i):
- k = self.parse_html_declaration(i)
- elif (i + 1) < n:
- self.handle_data("<")
- k = i + 1
- else:
- break
- if k < 0:
- if not end:
- break
- k = rawdata.find('>', i + 1)
- if k < 0:
- k = rawdata.find('<', i + 1)
- if k < 0:
- k = i + 1
- else:
- k += 1
- self.handle_data(rawdata[i:k])
- i = self.updatepos(i, k)
- elif startswith("&#", i):
- match = charref.match(rawdata, i)
- if match:
- name = match.group()[2:-1]
- self.handle_charref(name)
- k = match.end()
- if not startswith(';', k-1):
- k = k - 1
- i = self.updatepos(i, k)
- continue
- else:
- if ";" in rawdata[i:]: #bail by consuming &#
- self.handle_data(rawdata[0:2])
- i = self.updatepos(i, 2)
- break
- elif startswith('&', i):
- match = entityref.match(rawdata, i)
- if match:
- name = match.group(1)
- self.handle_entityref(name)
- k = match.end()
- if not startswith(';', k-1):
- k = k - 1
- i = self.updatepos(i, k)
- continue
- match = incomplete.match(rawdata, i)
- if match:
- # match.group() will contain at least 2 chars
- if end and match.group() == rawdata[i:]:
- self.error("EOF in middle of entity or char ref")
- # incomplete
- break
- elif (i + 1) < n:
- # not the end of the buffer, and can't be confused
- # with some other construct
- self.handle_data("&")
- i = self.updatepos(i, i + 1)
- else:
- break
- else:
- assert 0, "interesting.search() lied"
- # end while
- if end and i < n and not self.cdata_elem:
- self.handle_data(rawdata[i:n])
- i = self.updatepos(i, n)
- self.rawdata = rawdata[i:]
-
- # Internal -- parse html declarations, return length or -1 if not terminated
- # See w3.org/TR/html5/tokenization.html#markup-declaration-open-state
- # See also parse_declaration in _markupbase
- def parse_html_declaration(self, i):
- rawdata = self.rawdata
- if rawdata[i:i+2] != '<!':
- self.error('unexpected call to parse_html_declaration()')
- if rawdata[i:i+4] == '<!--':
- # this case is actually already handled in goahead()
- return self.parse_comment(i)
- elif rawdata[i:i+3] == '<![':
- return self.parse_marked_section(i)
- elif rawdata[i:i+9].lower() == '<!doctype':
- # find the closing >
- gtpos = rawdata.find('>', i+9)
- if gtpos == -1:
- return -1
- self.handle_decl(rawdata[i+2:gtpos])
- return gtpos+1
- else:
- return self.parse_bogus_comment(i)
-
- # Internal -- parse bogus comment, return length or -1 if not terminated
- # see http://www.w3.org/TR/html5/tokenization.html#bogus-comment-state
- def parse_bogus_comment(self, i, report=1):
- rawdata = self.rawdata
- if rawdata[i:i+2] not in ('<!', '</'):
- self.error('unexpected call to parse_comment()')
- pos = rawdata.find('>', i+2)
- if pos == -1:
- return -1
- if report:
- self.handle_comment(rawdata[i+2:pos])
- return pos + 1
-
- # Internal -- parse processing instr, return end or -1 if not terminated
- def parse_pi(self, i):
- rawdata = self.rawdata
- assert rawdata[i:i+2] == '<?', 'unexpected call to parse_pi()'
- match = piclose.search(rawdata, i+2) # >
- if not match:
- return -1
- j = match.start()
- self.handle_pi(rawdata[i+2: j])
- j = match.end()
- return j
-
- # Internal -- handle starttag, return end or -1 if not terminated
- def parse_starttag(self, i):
- self.__starttag_text = None
- endpos = self.check_for_whole_start_tag(i)
- if endpos < 0:
- return endpos
- rawdata = self.rawdata
- self.__starttag_text = rawdata[i:endpos]
-
- # Now parse the data between i+1 and j into a tag and attrs
- attrs = []
- match = tagfind.match(rawdata, i+1)
- assert match, 'unexpected call to parse_starttag()'
- k = match.end()
- self.lasttag = tag = match.group(1).lower()
-
- while k < endpos:
- m = attrfind.match(rawdata, k)
- if not m:
- break
- attrname, rest, attrvalue = m.group(1, 2, 3)
- if not rest:
- attrvalue = None
- elif attrvalue[:1] == '\'' == attrvalue[-1:] or \
- attrvalue[:1] == '"' == attrvalue[-1:]:
- attrvalue = attrvalue[1:-1]
- if attrvalue:
- attrvalue = self.unescape(attrvalue)
- attrs.append((attrname.lower(), attrvalue))
- k = m.end()
-
- end = rawdata[k:endpos].strip()
- if end not in (">", "/>"):
- lineno, offset = self.getpos()
- if "\n" in self.__starttag_text:
- lineno = lineno + self.__starttag_text.count("\n")
- offset = len(self.__starttag_text) \
- - self.__starttag_text.rfind("\n")
- else:
- offset = offset + len(self.__starttag_text)
- self.handle_data(rawdata[i:endpos])
- return endpos
- if end.endswith('/>'):
- # XHTML-style empty tag: <span attr="value" />
- self.handle_startendtag(tag, attrs)
- else:
- self.handle_starttag(tag, attrs)
- if tag in self.CDATA_CONTENT_ELEMENTS:
- self.set_cdata_mode(tag)
- return endpos
-
- # Internal -- check to see if we have a complete starttag; return end
- # or -1 if incomplete.
- def check_for_whole_start_tag(self, i):
- rawdata = self.rawdata
- m = locatestarttagend.match(rawdata, i)
- if m:
- j = m.end()
- next = rawdata[j:j+1]
- if next == ">":
- return j + 1
- if next == "/":
- if rawdata.startswith("/>", j):
- return j + 2
- if rawdata.startswith("/", j):
- # buffer boundary
- return -1
- # else bogus input
- self.updatepos(i, j + 1)
- self.error("malformed empty start tag")
- if next == "":
- # end of input
- return -1
- if next in ("abcdefghijklmnopqrstuvwxyz=/"
- "ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
- # end of input in or before attribute value, or we have the
- # '/' from a '/>' ending
- return -1
- if j > i:
- return j
- else:
- return i + 1
- raise AssertionError("we should not get here!")
-
- # Internal -- parse endtag, return end or -1 if incomplete
- def parse_endtag(self, i):
- rawdata = self.rawdata
- assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"
- match = endendtag.search(rawdata, i+1) # >
- if not match:
- return -1
- gtpos = match.end()
- match = endtagfind.match(rawdata, i) # </ + tag + >
- if not match:
- if self.cdata_elem is not None:
- self.handle_data(rawdata[i:gtpos])
- return gtpos
- # find the name: w3.org/TR/html5/tokenization.html#tag-name-state
- namematch = tagfind_tolerant.match(rawdata, i+2)
- if not namematch:
- # w3.org/TR/html5/tokenization.html#end-tag-open-state
- if rawdata[i:i+3] == '</>':
- return i+3
- else:
- return self.parse_bogus_comment(i)
- tagname = namematch.group().lower()
- # consume and ignore other stuff between the name and the >
- # Note: this is not 100% correct, since we might have things like
- # </tag attr=">">, but looking for > after tha name should cover
- # most of the cases and is much simpler
- gtpos = rawdata.find('>', namematch.end())
- self.handle_endtag(tagname)
- return gtpos+1
-
- elem = match.group(1).lower() # script or style
- if self.cdata_elem is not None:
- if elem != self.cdata_elem:
- self.handle_data(rawdata[i:gtpos])
- return gtpos
-
- self.handle_endtag(elem)
- self.clear_cdata_mode()
- return gtpos
-
- # Overridable -- finish processing of start+end tag: <tag.../>
- def handle_startendtag(self, tag, attrs):
- self.handle_starttag(tag, attrs)
- self.handle_endtag(tag)
-
- # Overridable -- handle start tag
- def handle_starttag(self, tag, attrs):
- pass
-
- # Overridable -- handle end tag
- def handle_endtag(self, tag):
- pass
-
- # Overridable -- handle character reference
- def handle_charref(self, name):
- pass
-
- # Overridable -- handle entity reference
- def handle_entityref(self, name):
- pass
-
- # Overridable -- handle data
- def handle_data(self, data):
- pass
-
- # Overridable -- handle comment
- def handle_comment(self, data):
- pass
-
- # Overridable -- handle declaration
- def handle_decl(self, decl):
- pass
-
- # Overridable -- handle processing instruction
- def handle_pi(self, data):
- pass
-
- def unknown_decl(self, data):
- pass
-
- # Internal -- helper to remove special character quoting
- entitydefs = None
- def unescape(self, s):
- if '&' not in s:
- return s
- def replaceEntities(s):
- s = s.groups()[0]
- try:
- if s[0] == "#":
- s = s[1:]
- if s[0] in ['x','X']:
- c = int(s[1:], 16)
- else:
- c = int(s)
- return unichr(c)
- except ValueError:
- return '&#'+s+';'
- else:
- # Cannot use name2codepoint directly, because HTMLParser supports apos,
- # which is not part of HTML 4
- import htmlentitydefs
- if HTMLParser.entitydefs is None:
- entitydefs = HTMLParser.entitydefs = {'apos':u"'"}
- for k, v in htmlentitydefs.name2codepoint.iteritems():
- entitydefs[k] = unichr(v)
- try:
- return self.entitydefs[s]
- except KeyError:
- return '&'+s+';'
-
- return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities, s)
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-13 20:23:18 +0000