--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/python-2.5.2/win32/Lib/HTMLParser.py Fri Apr 03 17:19:34 2009 +0100
@@ -0,0 +1,369 @@
+"""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('[&<]')
+interesting_cdata = re.compile(r'<(/|\Z)')
+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:_]*')
+attrfind = re.compile(
+ r'\s*([a-zA-Z_][-.:a-zA-Z_0-9]*)(\s*=\s*'
+ r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./,:;+*%?!&$\(\)_#=~@]*))?')
+
+locatestarttagend = re.compile(r"""
+ <[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
+ (?:\s+ # whitespace before attribute name
+ (?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name
+ (?:\s*=\s* # value indicator
+ (?:'[^']*' # LITA-enclosed value
+ |\"[^\"]*\" # LIT-enclosed value
+ |[^'\">\s]+ # bare value
+ )
+ )?
+ )
+ )*
+ \s* # trailing whitespace
+""", re.VERBOSE)
+endendtag = re.compile('>')
+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
+ markupbase.ParserBase.reset(self)
+
+ def feed(self, data):
+ """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):
+ self.interesting = interesting_cdata
+
+ def clear_cdata_mode(self):
+ self.interesting = interesting_normal
+
+ # 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:
+ 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_declaration(i)
+ elif (i + 1) < n:
+ self.handle_data("<")
+ k = i + 1
+ else:
+ break
+ if k < 0:
+ if end:
+ self.error("EOF in middle of construct")
+ break
+ 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:
+ 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:
+ self.handle_data(rawdata[i:n])
+ i = self.updatepos(i, n)
+ self.rawdata = rawdata[i:]
+
+ # 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 = rawdata[i+1:k].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]
+ 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.error("junk characters in start tag: %r"
+ % (rawdata[k:endpos][:20],))
+ 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()
+ 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
+ self.updatepos(i, j)
+ self.error("malformed start tag")
+ 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
+ j = match.end()
+ match = endtagfind.match(rawdata, i) # </ + tag + >
+ if not match:
+ self.error("bad end tag: %r" % (rawdata[i:j],))
+ tag = match.group(1)
+ self.handle_endtag(tag.lower())
+ self.clear_cdata_mode()
+ return j
+
+ # 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):
+ self.error("unknown declaration: %r" % (data,))
+
+ # Internal -- helper to remove special character quoting
+ def unescape(self, s):
+ if '&' not in s:
+ return s
+ s = s.replace("<", "<")
+ s = s.replace(">", ">")
+ s = s.replace("'", "'")
+ s = s.replace(""", '"')
+ s = s.replace("&", "&") # Must be last
+ return s