| Fred Drake | 55c3819 | 2000-06-29 19:39:57 +0000 | [diff] [blame^] | 1 | import minidom |
| 2 | import types |
| 3 | import string |
| 4 | import sys |
| 5 | import pyexpat |
| 6 | from xml.sax import ExpatParser |
| 7 | |
| 8 | #todo: SAX2/namespace handling |
| 9 | |
| 10 | START_ELEMENT="START_ELEMENT" |
| 11 | END_ELEMENT="END_ELEMENT" |
| 12 | COMMENT="COMMENT" |
| 13 | START_DOCUMENT="START_DOCUMENT" |
| 14 | END_DOCUMENT="END_DOCUMENT" |
| 15 | PROCESSING_INSTRUCTION="PROCESSING_INSTRUCTION" |
| 16 | IGNORABLE_WHITESPACE="IGNORABLE_WHITESPACE" |
| 17 | CHARACTERS="CHARACTERS" |
| 18 | |
| 19 | class PullDOM: |
| 20 | def __init__( self ): |
| 21 | self.firstEvent=[None,None] |
| 22 | self.lastEvent=self.firstEvent |
| 23 | |
| 24 | def setDocumentLocator( self, locator ): pass |
| 25 | |
| 26 | def startElement( self, tagName , attrs ): |
| 27 | if not hasattr( self, "curNode" ): |
| 28 | # FIXME: hack! |
| 29 | self.startDocument( ) |
| 30 | |
| 31 | node = self.document.createElement( tagName ) #FIXME namespaces! |
| 32 | for attr in attrs.keys(): |
| 33 | node.setAttribute( attr, attrs[attr] ) |
| 34 | |
| 35 | parent=self.curNode |
| 36 | node.parentNode = parent |
| 37 | if parent.childNodes: |
| 38 | node.previousSibling=parent.childNodes[-1] |
| 39 | node.previousSibling.nextSibling=node |
| 40 | self.curNode = node |
| 41 | # FIXME: do I have to screen namespace attributes |
| 42 | self.lastEvent[1]=[(START_ELEMENT, node), None ] |
| 43 | self.lastEvent=self.lastEvent[1] |
| 44 | #self.events.append( (START_ELEMENT, node) ) |
| 45 | |
| 46 | def endElement( self, name ): |
| 47 | node = self.curNode |
| 48 | self.lastEvent[1]=[(END_ELEMENT, node), None ] |
| 49 | self.lastEvent=self.lastEvent[1] |
| 50 | #self.events.append( (END_ELEMENT, node )) |
| 51 | self.curNode = node.parentNode |
| 52 | |
| 53 | def comment( self, s): |
| 54 | node = self.document.createComment ( s ) |
| 55 | parent=self.curNode |
| 56 | node.parentNode=parent |
| 57 | if parent.childNodes: |
| 58 | node.previousSibling=parent.childNodes[-1] |
| 59 | node.previousSibling.nextSibling=node |
| 60 | self.lastEvent[1]=[(COMMENT, node), None ] |
| 61 | self.lastEvent=self.lastEvent[1] |
| 62 | #self.events.append( (COMMENT, node )) |
| 63 | |
| 64 | def processingInstruction( self, target, data ): |
| 65 | node = self.document.createProcessingInstruction( target, data ) |
| 66 | #self.appendChild( node ) |
| 67 | |
| 68 | parent=self.curNode |
| 69 | node.parentNode=parent |
| 70 | if parent.childNodes: |
| 71 | node.previousSibling=parent.childNodes[-1] |
| 72 | node.previousSibling.nextSibling=node |
| 73 | self.lastEvent[1]=[(PROCESSING_INSTRUCTION, node), None ] |
| 74 | self.lastEvent=self.lastEvent[1] |
| 75 | #self.events.append( (PROCESSING_INSTRUCTION, node) ) |
| 76 | |
| 77 | def ignorableWhitespace( self, chars ): |
| 78 | node = self.document.createTextNode( chars[start:start+length] ) |
| 79 | parent=self.curNode |
| 80 | node.parentNode=parent |
| 81 | if parent.childNodes: |
| 82 | node.previousSibling=parent.childNodes[-1] |
| 83 | node.previousSibling.nextSibling=node |
| 84 | self.lastEvent[1]=[(IGNORABLE_WHITESPACE, node), None ] |
| 85 | self.lastEvent=self.lastEvent[1] |
| 86 | #self.events.append( (IGNORABLE_WHITESPACE, node)) |
| 87 | |
| 88 | def characters( self, chars ): |
| 89 | node = self.document.createTextNode( chars ) |
| 90 | node.parentNode=self.curNode |
| 91 | self.lastEvent[1]=[(CHARACTERS, node), None ] |
| 92 | self.lastEvent=self.lastEvent[1] |
| 93 | |
| 94 | def startDocument( self ): |
| 95 | node = self.curNode = self.document = minidom.Document() |
| 96 | node.parentNode=None |
| 97 | self.lastEvent[1]=[(START_DOCUMENT, node), None ] |
| 98 | self.lastEvent=self.lastEvent[1] |
| 99 | #self.events.append( (START_DOCUMENT, node) ) |
| 100 | |
| 101 | def endDocument( self ): |
| 102 | assert( not self.curNode.parentNode ) |
| 103 | for node in self.curNode.childNodes: |
| 104 | if node.nodeType==node.ELEMENT_NODE: |
| 105 | self.document.documentElement = node |
| 106 | #if not self.document.documentElement: |
| 107 | # raise Error, "No document element" |
| 108 | |
| 109 | self.lastEvent[1]=[(END_DOCUMENT, node), None ] |
| 110 | #self.events.append( (END_DOCUMENT, self.curNode) ) |
| 111 | |
| 112 | class ErrorHandler: |
| 113 | def warning( self, exception ): |
| 114 | print exception |
| 115 | def error( self, exception ): |
| 116 | raise exception |
| 117 | def fatalError( self, exception ): |
| 118 | raise exception |
| 119 | |
| 120 | class DOMEventStream: |
| 121 | def __init__( self, stream, parser, bufsize ): |
| 122 | self.stream=stream |
| 123 | self.parser=parser |
| 124 | self.bufsize=bufsize |
| 125 | self.reset() |
| 126 | |
| 127 | def reset( self ): |
| 128 | self.pulldom = PullDOM() |
| 129 | self.parser.setContentHandler( self.pulldom ) |
| 130 | |
| 131 | def __getitem__( self, pos ): |
| 132 | rc=self.getEvent() |
| 133 | if rc: return rc |
| 134 | raise IndexError |
| 135 | |
| 136 | def expandNode( self, node ): |
| 137 | event=self.getEvent() |
| 138 | while event: |
| 139 | token,cur_node=event |
| 140 | if cur_node is node: return |
| 141 | |
| 142 | if token !=END_ELEMENT: |
| 143 | cur_node.parentNode.childNodes.append( cur_node ) |
| 144 | event=self.getEvent() |
| 145 | if node.nodeType==minidom.Node.DOCUMENT_NODE: |
| 146 | for child in node.childNodes: |
| 147 | if child.nodeType==minidom.Node.ELEMENT_NODE: |
| 148 | node.documentElement=child |
| 149 | |
| 150 | def getEvent( self ): |
| 151 | if not self.pulldom.firstEvent[1]: |
| 152 | self.pulldom.lastEvent=self.pulldom.firstEvent |
| 153 | while not self.pulldom.firstEvent[1]: |
| 154 | buf=self.stream.read( self.bufsize ) |
| 155 | if not buf: |
| 156 | #FIXME: why doesn't Expat close work? |
| 157 | #self.parser.close() |
| 158 | return None |
| 159 | self.parser.feed( buf ) |
| 160 | rc=self.pulldom.firstEvent[1][0] |
| 161 | self.pulldom.firstEvent[1]=self.pulldom.firstEvent[1][1] |
| 162 | return rc |
| 163 | |
| 164 | # FIXME: sax2 |
| 165 | #def _getParser( ): |
| 166 | # from xml.sax.saxexts import make_parser |
| 167 | # expat doesn't report errors properly! Figure it out |
| 168 | # return make_parser() |
| 169 | # return make_parser("xml.sax.drivers.drv_xmllib") |
| 170 | |
| 171 | |
| 172 | |
| 173 | def _getParser(): |
| 174 | return ExpatParser() |
| 175 | |
| 176 | default_bufsize=(2**14)-20 |
| 177 | # FIXME: move into sax package for common usage |
| 178 | def parse( stream_or_string, parser=None, bufsize=default_bufsize ): |
| 179 | if type( stream_or_string ) == type( "" ): |
| 180 | stream=open( stream_or_string ) |
| 181 | else: |
| 182 | stream=stream_or_string |
| 183 | if not parser: |
| 184 | parser=_getParser() |
| 185 | return DOMEventStream( stream, parser, bufsize ) |
| 186 | |
| 187 | def parseString( string, parser=None ): |
| 188 | try: |
| 189 | import cStringIO |
| 190 | stringio=cStringIO.StringIO |
| 191 | except ImportError: |
| 192 | import StringIO |
| 193 | stringio=StringIO.StringIO |
| 194 | |
| 195 | bufsize=len( string ) |
| 196 | stringio( string ) |
| 197 | parser=_getParser() |
| 198 | return DOMEventStream( buf, parser, bufsize ) |
| 199 | |
| 200 | #FIXME: Use Lars' instead!!! |
| 201 | class SAX_expat: |
| 202 | "SAX driver for the Pyexpat C module." |
| 203 | |
| 204 | def __init__(self): |
| 205 | self.parser=pyexpat.ParserCreate() |
| 206 | self.started=0 |
| 207 | |
| 208 | def setDocumentHandler( self, handler ): |
| 209 | self.parser.StartElementHandler = handler.startElement |
| 210 | self.parser.EndElementHandler = handler.endElement |
| 211 | self.parser.CharacterDataHandler = handler.datachars |
| 212 | self.parser.ProcessingInstructionHandler = handler.processingInstruction |
| 213 | self.doc_handler=handler |
| 214 | |
| 215 | def setErrorHandler( self, handler ): |
| 216 | self.err_handler=handler |
| 217 | |
| 218 | # --- Locator methods. Only usable after errors. |
| 219 | |
| 220 | def getLineNumber(self): |
| 221 | return self.parser.ErrorLineNumber |
| 222 | |
| 223 | def getColumnNumber(self): |
| 224 | return self.parser.ErrorColumnNumber |
| 225 | |
| 226 | # --- Internal |
| 227 | |
| 228 | def __report_error(self): |
| 229 | msg=pyexpat.ErrorString(self.parser.ErrorCode) |
| 230 | self.err_handler.fatalError(msg) |
| 231 | |
| 232 | # --- EXPERIMENTAL PYTHON SAX EXTENSIONS |
| 233 | |
| 234 | def get_parser_name(self): |
| 235 | return "pyexpat" |
| 236 | |
| 237 | def get_parser_version(self): |
| 238 | return "Unknown" |
| 239 | |
| 240 | def get_driver_version(self): |
| 241 | return version |
| 242 | |
| 243 | def is_validating(self): |
| 244 | return 0 |
| 245 | |
| 246 | def is_dtd_reading(self): |
| 247 | return 0 |
| 248 | |
| 249 | def reset(self): |
| 250 | self.parser=pyexpat.ParserCreate() |
| 251 | self.parser.StartElementHandler = self.startElement |
| 252 | self.parser.EndElementHandler = self.endElement |
| 253 | self.parser.CharacterDataHandler = self.characters |
| 254 | self.parser.ProcessingInstructionHandler = self.processingInstruction |
| 255 | |
| 256 | def feed(self,data): |
| 257 | if not self.started: |
| 258 | self.doc_handler.startDocument() |
| 259 | self.started=1 |
| 260 | if not self.parser.Parse(data): |
| 261 | self.__report_error() |
| 262 | |
| 263 | def close(self): |
| 264 | if not self.parser.Parse("",1): |
| 265 | self.__report_error() |
| 266 | self.doc_handler.endDocument() |
| 267 | self.parser = None |