"""\ @file xml_rpc.py @brief An implementation of a parser/generator for the XML-RPC xml format. $LicenseInfo:firstyear=2006&license=mit$ Copyright (c) 2006-2009, Linden Research, Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. $/LicenseInfo$ """ from greenlet import greenlet from mulib import mu from xml.sax import handler from xml.sax import parseString # States class Expected(object): def __init__(self, tag): self.tag = tag def __getattr__(self, name): return type(self)(name) def __repr__(self): return '%s(%r)' % ( type(self).__name__, self.tag) class START(Expected): pass class END(Expected): pass class STR(object): tag = '' START = START('') END = END('') class Malformed(Exception): pass class XMLParser(handler.ContentHandler): def __init__(self, state_machine, next_states): handler.ContentHandler.__init__(self) self.state_machine = state_machine if not isinstance(next_states, tuple): next_states = (next_states, ) self.next_states = next_states self._character_buffer = '' def assertState(self, state, name, *rest): if not isinstance(self.next_states, tuple): self.next_states = (self.next_states, ) for next in self.next_states: if type(state) == type(next): if next.tag and next.tag != name: raise Malformed( "Expected %s, got %s %s %s" % ( next, state, name, rest)) break else: raise Malformed( "Expected %s, got %s %s %s" % ( self.next_states, state, name, rest)) def startElement(self, name, attrs): self.assertState(START, name.lower(), attrs) self.next_states = self.state_machine.switch(START, (name.lower(), dict(attrs))) def endElement(self, name): if self._character_buffer.strip(): characters = self._character_buffer.strip() self._character_buffer = '' self.assertState(STR, characters) self.next_states = self.state_machine.switch(characters) self.assertState(END, name.lower()) self.next_states = self.state_machine.switch(END, name.lower()) def error(self, exc): self.bozo = 1 self.exc = exc def fatalError(self, exc): self.error(exc) raise exc def characters(self, characters): self._character_buffer += characters def parse(what): child = greenlet(xml_rpc) me = greenlet.getcurrent() startup_states = child.switch(me) parser = XMLParser(child, startup_states) try: parseString(what, parser) except Malformed: print what raise return child.switch() def xml_rpc(yielder): yielder.switch(START.methodcall) yielder.switch(START.methodname) methodName = yielder.switch(STR) yielder.switch(END.methodname) yielder.switch(START.params) root = None params = [] while True: state, _ = yielder.switch(START.param, END.params) if state == END: break yielder.switch(START.value) params.append( handle(yielder)) yielder.switch(END.value) yielder.switch(END.param) yielder.switch(END.methodcall) ## Resume parse yielder.switch() ## Return result to parse return methodName.strip(), params def handle(yielder): _, (tag, attrs) = yielder.switch(START) if tag in ['int', 'i4']: result = int(yielder.switch(STR)) elif tag == 'boolean': result = bool(int(yielder.switch(STR))) elif tag == 'string': result = yielder.switch(STR) elif tag == 'double': result = float(yielder.switch(STR)) elif tag == 'datetime.iso8601': result = yielder.switch(STR) elif tag == 'base64': result = base64.b64decode(yielder.switch(STR)) elif tag == 'struct': result = {} while True: state, _ = yielder.switch(START.member, END.struct) if state == END: break yielder.switch(START.name) key = yielder.switch(STR) yielder.switch(END.name) yielder.switch(START.value) result[key] = handle(yielder) yielder.switch(END.value) yielder.switch(END.member) ## We already handled above, don't want to handle it below return result elif tag == 'array': result = [] yielder.switch(START.data) while True: state, _ = yielder.switch(START.value, END.data) if state == END: break result.append(handle(yielder)) yielder.switch(END.value) yielder.switch(getattr(END, tag)) return result VALUE = mu.tag_factory('value') BOOLEAN = mu.tag_factory('boolean') INT = mu.tag_factory('int') STRUCT = mu.tag_factory('struct') MEMBER = mu.tag_factory('member') NAME = mu.tag_factory('name') ARRAY = mu.tag_factory('array') DATA = mu.tag_factory('data') STRING = mu.tag_factory('string') DOUBLE = mu.tag_factory('double') METHODRESPONSE = mu.tag_factory('methodResponse') PARAMS = mu.tag_factory('params') PARAM = mu.tag_factory('param') mu.inline_elements['string'] = True mu.inline_elements['boolean'] = True mu.inline_elements['name'] = True def _generate(something): if isinstance(something, dict): result = STRUCT() for key, value in something.items(): result[ MEMBER[ NAME[key], _generate(value)]] return VALUE[result] elif isinstance(something, list): result = DATA() for item in something: result[_generate(item)] return VALUE[ARRAY[[result]]] elif isinstance(something, basestring): return VALUE[STRING[something]] elif isinstance(something, bool): if something: return VALUE[BOOLEAN['1']] return VALUE[BOOLEAN['0']] elif isinstance(something, int): return VALUE[INT[something]] elif isinstance(something, float): return VALUE[DOUBLE[something]] def generate(*args): params = PARAMS() for arg in args: params[PARAM[_generate(arg)]] return METHODRESPONSE[params] if __name__ == '__main__': print parse(""" examples.getStateName 41 """)