637 lines
20 KiB
Python
637 lines
20 KiB
Python
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# -*- test-case-name: twisted.web.test.test_xml -*-
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#
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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*S*mall, *U*ncomplicated *X*ML.
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This is a very simple implementation of XML/HTML as a network
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protocol. It is not at all clever. Its main features are that it
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does not:
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- support namespaces
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- mung mnemonic entity references
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- validate
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- perform *any* external actions (such as fetching URLs or writing files)
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under *any* circumstances
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- has lots and lots of horrible hacks for supporting broken HTML (as an
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option, they're not on by default).
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"""
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from twisted.internet.protocol import Protocol
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from twisted.python.reflect import prefixedMethodNames
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# Elements of the three-tuples in the state table.
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BEGIN_HANDLER = 0
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DO_HANDLER = 1
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END_HANDLER = 2
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identChars = '.-_:'
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lenientIdentChars = identChars + ';+#/%~'
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def nop(*args, **kw):
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"Do nothing."
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def unionlist(*args):
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l = []
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for x in args:
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l.extend(x)
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d = dict([(x, 1) for x in l])
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return d.keys()
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def zipfndict(*args, **kw):
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default = kw.get('default', nop)
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d = {}
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for key in unionlist(*[fndict.keys() for fndict in args]):
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d[key] = tuple([x.get(key, default) for x in args])
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return d
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def prefixedMethodClassDict(clazz, prefix):
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return dict([(name, getattr(clazz, prefix + name)) for name in prefixedMethodNames(clazz, prefix)])
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def prefixedMethodObjDict(obj, prefix):
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return dict([(name, getattr(obj, prefix + name)) for name in prefixedMethodNames(obj.__class__, prefix)])
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class ParseError(Exception):
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def __init__(self, filename, line, col, message):
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self.filename = filename
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self.line = line
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self.col = col
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self.message = message
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def __str__(self):
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return "%s:%s:%s: %s" % (self.filename, self.line, self.col,
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self.message)
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class XMLParser(Protocol):
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state = None
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encodings = None
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filename = "<xml />"
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beExtremelyLenient = 0
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_prepend = None
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# _leadingBodyData will sometimes be set before switching to the
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# 'bodydata' state, when we "accidentally" read a byte of bodydata
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# in a different state.
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_leadingBodyData = None
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def connectionMade(self):
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self.lineno = 1
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self.colno = 0
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self.encodings = []
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def saveMark(self):
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'''Get the line number and column of the last character parsed'''
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# This gets replaced during dataReceived, restored afterwards
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return (self.lineno, self.colno)
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def _parseError(self, message):
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raise ParseError(*((self.filename,)+self.saveMark()+(message,)))
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def _buildStateTable(self):
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'''Return a dictionary of begin, do, end state function tuples'''
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# _buildStateTable leaves something to be desired but it does what it
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# does.. probably slowly, so I'm doing some evil caching so it doesn't
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# get called more than once per class.
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stateTable = getattr(self.__class__, '__stateTable', None)
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if stateTable is None:
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stateTable = self.__class__.__stateTable = zipfndict(
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*[prefixedMethodObjDict(self, prefix)
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for prefix in ('begin_', 'do_', 'end_')])
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return stateTable
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def _decode(self, data):
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if 'UTF-16' in self.encodings or 'UCS-2' in self.encodings:
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assert not len(data) & 1, 'UTF-16 must come in pairs for now'
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if self._prepend:
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data = self._prepend + data
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for encoding in self.encodings:
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data = unicode(data, encoding)
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return data
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def maybeBodyData(self):
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if self.endtag:
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return 'bodydata'
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# Get ready for fun! We're going to allow
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# <script>if (foo < bar)</script> to work!
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# We do this by making everything between <script> and
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# </script> a Text
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# BUT <script src="foo"> will be special-cased to do regular,
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# lenient behavior, because those may not have </script>
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# -radix
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if (self.tagName == 'script' and 'src' not in self.tagAttributes):
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# we do this ourselves rather than having begin_waitforendscript
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# becuase that can get called multiple times and we don't want
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# bodydata to get reset other than the first time.
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self.begin_bodydata(None)
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return 'waitforendscript'
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return 'bodydata'
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def dataReceived(self, data):
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stateTable = self._buildStateTable()
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if not self.state:
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# all UTF-16 starts with this string
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if data.startswith('\xff\xfe'):
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self._prepend = '\xff\xfe'
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self.encodings.append('UTF-16')
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data = data[2:]
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elif data.startswith('\xfe\xff'):
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self._prepend = '\xfe\xff'
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self.encodings.append('UTF-16')
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data = data[2:]
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self.state = 'begin'
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if self.encodings:
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data = self._decode(data)
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# bring state, lineno, colno into local scope
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lineno, colno = self.lineno, self.colno
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curState = self.state
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# replace saveMark with a nested scope function
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_saveMark = self.saveMark
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def saveMark():
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return (lineno, colno)
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self.saveMark = saveMark
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# fetch functions from the stateTable
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beginFn, doFn, endFn = stateTable[curState]
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try:
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for byte in data:
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# do newline stuff
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if byte == '\n':
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lineno += 1
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colno = 0
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else:
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colno += 1
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newState = doFn(byte)
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if newState is not None and newState != curState:
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# this is the endFn from the previous state
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endFn()
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curState = newState
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beginFn, doFn, endFn = stateTable[curState]
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beginFn(byte)
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finally:
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self.saveMark = _saveMark
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self.lineno, self.colno = lineno, colno
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# state doesn't make sense if there's an exception..
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self.state = curState
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def connectionLost(self, reason):
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"""
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End the last state we were in.
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"""
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stateTable = self._buildStateTable()
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stateTable[self.state][END_HANDLER]()
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# state methods
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def do_begin(self, byte):
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if byte.isspace():
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return
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if byte != '<':
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if self.beExtremelyLenient:
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self._leadingBodyData = byte
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return 'bodydata'
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self._parseError("First char of document [%r] wasn't <" % (byte,))
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return 'tagstart'
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def begin_comment(self, byte):
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self.commentbuf = ''
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def do_comment(self, byte):
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self.commentbuf += byte
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if self.commentbuf.endswith('-->'):
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self.gotComment(self.commentbuf[:-3])
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return 'bodydata'
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def begin_tagstart(self, byte):
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self.tagName = '' # name of the tag
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self.tagAttributes = {} # attributes of the tag
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self.termtag = 0 # is the tag self-terminating
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self.endtag = 0
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def do_tagstart(self, byte):
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if byte.isalnum() or byte in identChars:
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self.tagName += byte
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if self.tagName == '!--':
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return 'comment'
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elif byte.isspace():
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if self.tagName:
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if self.endtag:
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# properly strict thing to do here is probably to only
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# accept whitespace
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return 'waitforgt'
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return 'attrs'
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else:
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self._parseError("Whitespace before tag-name")
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elif byte == '>':
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if self.endtag:
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self.gotTagEnd(self.tagName)
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return 'bodydata'
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else:
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self.gotTagStart(self.tagName, {})
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return (not self.beExtremelyLenient) and 'bodydata' or self.maybeBodyData()
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elif byte == '/':
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if self.tagName:
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return 'afterslash'
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else:
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self.endtag = 1
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elif byte in '!?':
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if self.tagName:
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if not self.beExtremelyLenient:
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self._parseError("Invalid character in tag-name")
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else:
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self.tagName += byte
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self.termtag = 1
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elif byte == '[':
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if self.tagName == '!':
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return 'expectcdata'
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else:
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self._parseError("Invalid '[' in tag-name")
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else:
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if self.beExtremelyLenient:
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self.bodydata = '<'
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return 'unentity'
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self._parseError('Invalid tag character: %r'% byte)
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def begin_unentity(self, byte):
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self.bodydata += byte
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def do_unentity(self, byte):
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self.bodydata += byte
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return 'bodydata'
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def end_unentity(self):
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self.gotText(self.bodydata)
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def begin_expectcdata(self, byte):
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self.cdatabuf = byte
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def do_expectcdata(self, byte):
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self.cdatabuf += byte
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cdb = self.cdatabuf
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cd = '[CDATA['
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if len(cd) > len(cdb):
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if cd.startswith(cdb):
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return
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elif self.beExtremelyLenient:
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## WHAT THE CRAP!? MSWord9 generates HTML that includes these
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## bizarre <![if !foo]> <![endif]> chunks, so I've gotta ignore
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## 'em as best I can. this should really be a separate parse
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## state but I don't even have any idea what these _are_.
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return 'waitforgt'
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else:
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self._parseError("Mal-formed CDATA header")
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if cd == cdb:
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self.cdatabuf = ''
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return 'cdata'
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self._parseError("Mal-formed CDATA header")
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def do_cdata(self, byte):
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self.cdatabuf += byte
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if self.cdatabuf.endswith("]]>"):
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self.cdatabuf = self.cdatabuf[:-3]
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return 'bodydata'
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def end_cdata(self):
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self.gotCData(self.cdatabuf)
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self.cdatabuf = ''
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def do_attrs(self, byte):
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if byte.isalnum() or byte in identChars:
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# XXX FIXME really handle !DOCTYPE at some point
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if self.tagName == '!DOCTYPE':
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return 'doctype'
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if self.tagName[0] in '!?':
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return 'waitforgt'
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return 'attrname'
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elif byte.isspace():
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return
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elif byte == '>':
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self.gotTagStart(self.tagName, self.tagAttributes)
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return (not self.beExtremelyLenient) and 'bodydata' or self.maybeBodyData()
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elif byte == '/':
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return 'afterslash'
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elif self.beExtremelyLenient:
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# discard and move on? Only case I've seen of this so far was:
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# <foo bar="baz"">
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return
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self._parseError("Unexpected character: %r" % byte)
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def begin_doctype(self, byte):
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self.doctype = byte
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def do_doctype(self, byte):
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if byte == '>':
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return 'bodydata'
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self.doctype += byte
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def end_doctype(self):
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self.gotDoctype(self.doctype)
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self.doctype = None
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def do_waitforgt(self, byte):
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if byte == '>':
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if self.endtag or not self.beExtremelyLenient:
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return 'bodydata'
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return self.maybeBodyData()
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def begin_attrname(self, byte):
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self.attrname = byte
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self._attrname_termtag = 0
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def do_attrname(self, byte):
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if byte.isalnum() or byte in identChars:
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self.attrname += byte
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return
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elif byte == '=':
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return 'beforeattrval'
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elif byte.isspace():
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return 'beforeeq'
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elif self.beExtremelyLenient:
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if byte in '"\'':
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return 'attrval'
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if byte in lenientIdentChars or byte.isalnum():
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self.attrname += byte
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return
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if byte == '/':
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self._attrname_termtag = 1
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return
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if byte == '>':
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self.attrval = 'True'
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self.tagAttributes[self.attrname] = self.attrval
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self.gotTagStart(self.tagName, self.tagAttributes)
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if self._attrname_termtag:
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self.gotTagEnd(self.tagName)
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return 'bodydata'
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return self.maybeBodyData()
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# something is really broken. let's leave this attribute where it
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# is and move on to the next thing
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return
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self._parseError("Invalid attribute name: %r %r" % (self.attrname, byte))
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def do_beforeattrval(self, byte):
|
||
|
|
if byte in '"\'':
|
||
|
|
return 'attrval'
|
||
|
|
elif byte.isspace():
|
||
|
|
return
|
||
|
|
elif self.beExtremelyLenient:
|
||
|
|
if byte in lenientIdentChars or byte.isalnum():
|
||
|
|
return 'messyattr'
|
||
|
|
if byte == '>':
|
||
|
|
self.attrval = 'True'
|
||
|
|
self.tagAttributes[self.attrname] = self.attrval
|
||
|
|
self.gotTagStart(self.tagName, self.tagAttributes)
|
||
|
|
return self.maybeBodyData()
|
||
|
|
if byte == '\\':
|
||
|
|
# I saw this in actual HTML once:
|
||
|
|
# <font size=\"3\"><sup>SM</sup></font>
|
||
|
|
return
|
||
|
|
self._parseError("Invalid initial attribute value: %r; Attribute values must be quoted." % byte)
|
||
|
|
|
||
|
|
attrname = ''
|
||
|
|
attrval = ''
|
||
|
|
|
||
|
|
def begin_beforeeq(self,byte):
|
||
|
|
self._beforeeq_termtag = 0
|
||
|
|
|
||
|
|
def do_beforeeq(self, byte):
|
||
|
|
if byte == '=':
|
||
|
|
return 'beforeattrval'
|
||
|
|
elif byte.isspace():
|
||
|
|
return
|
||
|
|
elif self.beExtremelyLenient:
|
||
|
|
if byte.isalnum() or byte in identChars:
|
||
|
|
self.attrval = 'True'
|
||
|
|
self.tagAttributes[self.attrname] = self.attrval
|
||
|
|
return 'attrname'
|
||
|
|
elif byte == '>':
|
||
|
|
self.attrval = 'True'
|
||
|
|
self.tagAttributes[self.attrname] = self.attrval
|
||
|
|
self.gotTagStart(self.tagName, self.tagAttributes)
|
||
|
|
if self._beforeeq_termtag:
|
||
|
|
self.gotTagEnd(self.tagName)
|
||
|
|
return 'bodydata'
|
||
|
|
return self.maybeBodyData()
|
||
|
|
elif byte == '/':
|
||
|
|
self._beforeeq_termtag = 1
|
||
|
|
return
|
||
|
|
self._parseError("Invalid attribute")
|
||
|
|
|
||
|
|
def begin_attrval(self, byte):
|
||
|
|
self.quotetype = byte
|
||
|
|
self.attrval = ''
|
||
|
|
|
||
|
|
def do_attrval(self, byte):
|
||
|
|
if byte == self.quotetype:
|
||
|
|
return 'attrs'
|
||
|
|
self.attrval += byte
|
||
|
|
|
||
|
|
def end_attrval(self):
|
||
|
|
self.tagAttributes[self.attrname] = self.attrval
|
||
|
|
self.attrname = self.attrval = ''
|
||
|
|
|
||
|
|
def begin_messyattr(self, byte):
|
||
|
|
self.attrval = byte
|
||
|
|
|
||
|
|
def do_messyattr(self, byte):
|
||
|
|
if byte.isspace():
|
||
|
|
return 'attrs'
|
||
|
|
elif byte == '>':
|
||
|
|
endTag = 0
|
||
|
|
if self.attrval.endswith('/'):
|
||
|
|
endTag = 1
|
||
|
|
self.attrval = self.attrval[:-1]
|
||
|
|
self.tagAttributes[self.attrname] = self.attrval
|
||
|
|
self.gotTagStart(self.tagName, self.tagAttributes)
|
||
|
|
if endTag:
|
||
|
|
self.gotTagEnd(self.tagName)
|
||
|
|
return 'bodydata'
|
||
|
|
return self.maybeBodyData()
|
||
|
|
else:
|
||
|
|
self.attrval += byte
|
||
|
|
|
||
|
|
def end_messyattr(self):
|
||
|
|
if self.attrval:
|
||
|
|
self.tagAttributes[self.attrname] = self.attrval
|
||
|
|
|
||
|
|
def begin_afterslash(self, byte):
|
||
|
|
self._after_slash_closed = 0
|
||
|
|
|
||
|
|
def do_afterslash(self, byte):
|
||
|
|
# this state is only after a self-terminating slash, e.g. <foo/>
|
||
|
|
if self._after_slash_closed:
|
||
|
|
self._parseError("Mal-formed")#XXX When does this happen??
|
||
|
|
if byte != '>':
|
||
|
|
if self.beExtremelyLenient:
|
||
|
|
return
|
||
|
|
else:
|
||
|
|
self._parseError("No data allowed after '/'")
|
||
|
|
self._after_slash_closed = 1
|
||
|
|
self.gotTagStart(self.tagName, self.tagAttributes)
|
||
|
|
self.gotTagEnd(self.tagName)
|
||
|
|
# don't need maybeBodyData here because there better not be
|
||
|
|
# any javascript code after a <script/>... we'll see :(
|
||
|
|
return 'bodydata'
|
||
|
|
|
||
|
|
def begin_bodydata(self, byte):
|
||
|
|
if self._leadingBodyData:
|
||
|
|
self.bodydata = self._leadingBodyData
|
||
|
|
del self._leadingBodyData
|
||
|
|
else:
|
||
|
|
self.bodydata = ''
|
||
|
|
|
||
|
|
def do_bodydata(self, byte):
|
||
|
|
if byte == '<':
|
||
|
|
return 'tagstart'
|
||
|
|
if byte == '&':
|
||
|
|
return 'entityref'
|
||
|
|
self.bodydata += byte
|
||
|
|
|
||
|
|
def end_bodydata(self):
|
||
|
|
self.gotText(self.bodydata)
|
||
|
|
self.bodydata = ''
|
||
|
|
|
||
|
|
def do_waitforendscript(self, byte):
|
||
|
|
if byte == '<':
|
||
|
|
return 'waitscriptendtag'
|
||
|
|
self.bodydata += byte
|
||
|
|
|
||
|
|
def begin_waitscriptendtag(self, byte):
|
||
|
|
self.temptagdata = ''
|
||
|
|
self.tagName = ''
|
||
|
|
self.endtag = 0
|
||
|
|
|
||
|
|
def do_waitscriptendtag(self, byte):
|
||
|
|
# 1 enforce / as first byte read
|
||
|
|
# 2 enforce following bytes to be subset of "script" until
|
||
|
|
# tagName == "script"
|
||
|
|
# 2a when that happens, gotText(self.bodydata) and gotTagEnd(self.tagName)
|
||
|
|
# 3 spaces can happen anywhere, they're ignored
|
||
|
|
# e.g. < / script >
|
||
|
|
# 4 anything else causes all data I've read to be moved to the
|
||
|
|
# bodydata, and switch back to waitforendscript state
|
||
|
|
|
||
|
|
# If it turns out this _isn't_ a </script>, we need to
|
||
|
|
# remember all the data we've been through so we can append it
|
||
|
|
# to bodydata
|
||
|
|
self.temptagdata += byte
|
||
|
|
|
||
|
|
# 1
|
||
|
|
if byte == '/':
|
||
|
|
self.endtag = True
|
||
|
|
elif not self.endtag:
|
||
|
|
self.bodydata += "<" + self.temptagdata
|
||
|
|
return 'waitforendscript'
|
||
|
|
# 2
|
||
|
|
elif byte.isalnum() or byte in identChars:
|
||
|
|
self.tagName += byte
|
||
|
|
if not 'script'.startswith(self.tagName):
|
||
|
|
self.bodydata += "<" + self.temptagdata
|
||
|
|
return 'waitforendscript'
|
||
|
|
elif self.tagName == 'script':
|
||
|
|
self.gotText(self.bodydata)
|
||
|
|
self.gotTagEnd(self.tagName)
|
||
|
|
return 'waitforgt'
|
||
|
|
# 3
|
||
|
|
elif byte.isspace():
|
||
|
|
return 'waitscriptendtag'
|
||
|
|
# 4
|
||
|
|
else:
|
||
|
|
self.bodydata += "<" + self.temptagdata
|
||
|
|
return 'waitforendscript'
|
||
|
|
|
||
|
|
|
||
|
|
def begin_entityref(self, byte):
|
||
|
|
self.erefbuf = ''
|
||
|
|
self.erefextra = '' # extra bit for lenient mode
|
||
|
|
|
||
|
|
def do_entityref(self, byte):
|
||
|
|
if byte.isspace() or byte == "<":
|
||
|
|
if self.beExtremelyLenient:
|
||
|
|
# '&foo' probably was '&foo'
|
||
|
|
if self.erefbuf and self.erefbuf != "amp":
|
||
|
|
self.erefextra = self.erefbuf
|
||
|
|
self.erefbuf = "amp"
|
||
|
|
if byte == "<":
|
||
|
|
return "tagstart"
|
||
|
|
else:
|
||
|
|
self.erefextra += byte
|
||
|
|
return 'spacebodydata'
|
||
|
|
self._parseError("Bad entity reference")
|
||
|
|
elif byte != ';':
|
||
|
|
self.erefbuf += byte
|
||
|
|
else:
|
||
|
|
return 'bodydata'
|
||
|
|
|
||
|
|
def end_entityref(self):
|
||
|
|
self.gotEntityReference(self.erefbuf)
|
||
|
|
|
||
|
|
# hacky support for space after & in entityref in beExtremelyLenient
|
||
|
|
# state should only happen in that case
|
||
|
|
def begin_spacebodydata(self, byte):
|
||
|
|
self.bodydata = self.erefextra
|
||
|
|
self.erefextra = None
|
||
|
|
do_spacebodydata = do_bodydata
|
||
|
|
end_spacebodydata = end_bodydata
|
||
|
|
|
||
|
|
# Sorta SAX-ish API
|
||
|
|
|
||
|
|
def gotTagStart(self, name, attributes):
|
||
|
|
'''Encountered an opening tag.
|
||
|
|
|
||
|
|
Default behaviour is to print.'''
|
||
|
|
print 'begin', name, attributes
|
||
|
|
|
||
|
|
def gotText(self, data):
|
||
|
|
'''Encountered text
|
||
|
|
|
||
|
|
Default behaviour is to print.'''
|
||
|
|
print 'text:', repr(data)
|
||
|
|
|
||
|
|
def gotEntityReference(self, entityRef):
|
||
|
|
'''Encountered mnemonic entity reference
|
||
|
|
|
||
|
|
Default behaviour is to print.'''
|
||
|
|
print 'entityRef: &%s;' % entityRef
|
||
|
|
|
||
|
|
def gotComment(self, comment):
|
||
|
|
'''Encountered comment.
|
||
|
|
|
||
|
|
Default behaviour is to ignore.'''
|
||
|
|
pass
|
||
|
|
|
||
|
|
def gotCData(self, cdata):
|
||
|
|
'''Encountered CDATA
|
||
|
|
|
||
|
|
Default behaviour is to call the gotText method'''
|
||
|
|
self.gotText(cdata)
|
||
|
|
|
||
|
|
def gotDoctype(self, doctype):
|
||
|
|
"""Encountered DOCTYPE
|
||
|
|
|
||
|
|
This is really grotty: it basically just gives you everything between
|
||
|
|
'<!DOCTYPE' and '>' as an argument.
|
||
|
|
"""
|
||
|
|
print '!DOCTYPE', repr(doctype)
|
||
|
|
|
||
|
|
def gotTagEnd(self, name):
|
||
|
|
'''Encountered closing tag
|
||
|
|
|
||
|
|
Default behaviour is to print.'''
|
||
|
|
print 'end', name
|