Paul Prescod <paul@prescod.net>:
W3C DOM implementation for Python.
This commit is contained in:
Fred Drake
parent
3f6a7b5efb
commit
55c3819e6a
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import pulldom
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import string
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from StringIO import StringIO
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import types
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"""
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minidom.py -- a lightweight DOM implementation based on SAX.
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Todo:
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=====
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* convenience methods for getting elements and text.
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* more testing
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* bring some of the writer and linearizer code into conformance with this
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interface
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* SAX 2 namespaces
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"""
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class Node:
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ELEMENT_NODE = 1
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ATTRIBUTE_NODE = 2
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TEXT_NODE = 3
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CDATA_SECTION_NODE = 4
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ENTITY_REFERENCE_NODE = 5
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ENTITY_NODE = 6
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PROCESSING_INSTRUCTION_NODE = 7
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COMMENT_NODE = 8
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DOCUMENT_NODE = 9
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DOCUMENT_TYPE_NODE = 10
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DOCUMENT_FRAGMENT_NODE = 11
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NOTATION_NODE = 12
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allnodes=[]
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def __init__( self ):
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self.childNodes=[]
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Node.allnodes.append( repr( id( self ))+repr( self.__class__ ))
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def __getattr__( self, key ):
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if key[0:2]=="__": raise AttributeError
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# getattr should never call getattr!
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if self.__dict__.has_key("inGetAttr"):
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del self.inGetAttr
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raise AttributeError, key
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prefix,attrname=key[:5],key[5:]
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if prefix=="_get_":
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self.inGetAttr=1
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if hasattr( self, attrname ):
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del self.inGetAttr
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return (lambda self=self, attrname=attrname:
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getattr( self, attrname ))
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else:
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del self.inGetAttr
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raise AttributeError, key
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else:
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self.inGetAttr=1
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try:
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func = getattr( self, "_get_"+key )
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except AttributeError:
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raise AttributeError, key
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del self.inGetAttr
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return func()
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def __nonzero__(self): return 1
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def toxml( self ):
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writer=StringIO()
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self.writexml( writer )
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return writer.getvalue()
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def hasChildNodes( self ):
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if self.childNodes: return 1
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else: return 0
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def insertBefore( self, newChild, refChild):
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index=self.childNodes.index( refChild )
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self.childNodes.insert( index, newChild )
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def appendChild( self, node ):
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self.childNodes.append( node )
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def unlink( self ):
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self.parentNode=None
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while self.childNodes:
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self.childNodes[-1].unlink()
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del self.childNodes[-1] # probably not most efficient!
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self.childNodes=None
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if self.attributes:
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for attr in self.attributes.values():
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attr.unlink()
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self.attributes=None
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index=Node.allnodes.index( repr( id( self ))+repr( self.__class__ ))
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del Node.allnodes[index]
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def _write_data( writer, data):
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"Writes datachars to writer."
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data=string.replace(data,"&","&")
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data=string.replace(data,"<","<")
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data=string.replace(data,"\"",""")
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data=string.replace(data,">",">")
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writer.write(data)
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def _closeElement( element ):
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del element.parentNode
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for node in element.elements:
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_closeElement( node )
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def _getElementsByTagNameHelper( parent, name, rc ):
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for node in parent.childNodes:
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if node.nodeType==Node.ELEMENT_NODE and\
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(name=="*" or node.tagName==name):
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rc.append( node )
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_getElementsByTagNameHelper( node, name, rc )
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return rc
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def _getElementsByTagNameNSHelper( parent, nsURI, localName, rc ):
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for node in parent.childNodes:
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if (node.nodeType==Node.ELEMENT_NODE ):
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if ((localName=="*" or node.tagName==localName) and
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(nsURI=="*" or node.namespaceURI==nsURI)):
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rc.append( node )
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_getElementsByTagNameNSHelper( node, name, rc )
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class Attr(Node):
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nodeType=Node.ATTRIBUTE_NODE
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def __init__( self, qName, namespaceURI="", prefix="",
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localName=None ):
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Node.__init__( self )
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assert qName
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# skip setattr for performance
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self.__dict__["nodeName"] = self.__dict__["name"] = qName
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self.__dict__["localName"]=localName or qName
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self.__dict__["prefix"]=prefix
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self.__dict__["namespaceURI"]=namespaceURI
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# nodeValue and value are set elsewhere
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self.attributes=None
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def __setattr__( self, name, value ):
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if name in ("value", "nodeValue" ):
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self.__dict__["value"]=self.__dict__["nodeValue"]=value
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else:
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self.__dict__[name]=value
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class AttributeList:
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# the attribute list is a transient interface to the underlying dictionaries
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# mutations here will change the underlying element's dictionary
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def __init__( self, attrs, attrsNS ):
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self.__attrs=attrs
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self.__attrsNS=attrs
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self.length=len( self.__attrs.keys() )
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def item( self, index ):
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try:
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return self[self.keys()[index]]
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except IndexError:
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return None
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def items( self ):
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return map( lambda node: (node.tagName, node.value),
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self.__attrs.values() )
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def itemsNS( self ):
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return map( lambda node: ((node.URI, node.localName), node.value),
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self.__attrs.values() )
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def keys( self ):
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return self.__attrs.keys()
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def keysNS( self ):
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return self.__attrsNS.keys()
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def values( self ):
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return self.__attrs.values()
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def __len__( self ):
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return self.length
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def __cmp__( self, other ):
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if self.__attrs is other.__attrs:
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return 0
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else:
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return cmp( id( self ), id( other ) )
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#FIXME: is it appropriate to return .value?
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def __getitem__( self, attname_or_tuple ):
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if type( attname_or_tuple ) == type( (1,2) ):
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return self.__attrsNS[attname_or_tuple].value
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else:
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return self.__attrs[attname_or_tuple].value
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def __setitem__( self, attname ):
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raise TypeError, "object does not support item assignment"
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class Element( Node ):
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nodeType=Node.ELEMENT_NODE
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def __init__( self, tagName, namespaceURI="", prefix="",
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localName=None ):
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Node.__init__( self )
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self.tagName = self.nodeName = tagName
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self.localName=localName or tagName
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self.prefix=prefix
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self.namespaceURI=namespaceURI
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self.nodeValue=None
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self.__attrs={} # attributes are double-indexed:
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self.__attrsNS={}# tagName -> Attribute
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# URI,localName -> Attribute
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# in the future: consider lazy generation of attribute objects
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# this is too tricky for now because of headaches
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# with namespaces.
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def getAttribute( self, attname ):
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return self.__attrs[attname].value
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def getAttributeNS( self, namespaceURI, localName ):
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return self.__attrsNS[(namespaceURI, localName)].value
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def setAttribute( self, attname, value ):
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attr=Attr( attname )
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# for performance
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attr.__dict__["value"]=attr.__dict__["nodeValue"]=value
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self.setAttributeNode( attr )
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def setAttributeNS( self, namespaceURI, qualifiedName, value ):
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attr=createAttributeNS( namespaceURI, qualifiedName )
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# for performance
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attr.__dict__["value"]=attr.__dict__["nodeValue"]=value
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self.setAttributeNode( attr )
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def setAttributeNode( self, attr ):
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self.__attrs[attr.name]=attr
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self.__attrsNS[(attr.namespaceURI,attr.localName)]=attr
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def removeAttribute( self, name ):
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attr = self.__attrs[name]
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self.removeAttributeNode( attr )
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def removeAttributeNS( self, namespaceURI, localName ):
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attr = self.__attrsNS[(uri, localName)]
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self.removeAttributeNode( attr )
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def removeAttributeNode( self, node ):
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del self.__attrs[node.name]
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del self.__attrsNS[(node.namespaceURI, node.localName)]
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def getElementsByTagName( self, name ):
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return _getElementsByTagNameHelper( self, name, [] )
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def getElementsByTagNameNS(self,namespaceURI,localName):
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_getElementsByTagNameNSHelper( self, namespaceURI, localName, [] )
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def __repr__( self ):
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return "<DOM Element:"+self.tagName+" at "+`id( self )` +" >"
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def writexml(self, writer):
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writer.write("<"+self.tagName)
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a_names=self._get_attributes().keys()
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a_names.sort()
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for a_name in a_names:
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writer.write(" "+a_name+"=\"")
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_write_data(writer, self._get_attributes()[a_name])
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writer.write("\"")
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if self.childNodes:
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writer.write(">")
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for node in self.childNodes:
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node.writexml( writer )
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writer.write("</"+self.tagName+">")
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else:
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writer.write("/>")
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def _get_attributes( self ):
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return AttributeList( self.__attrs, self.__attrsNS )
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class Comment( Node ):
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nodeType=Node.COMMENT_NODE
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def __init__(self, data ):
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Node.__init__( self )
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self.data=self.nodeValue=data
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self.nodeName="#comment"
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self.attributes=None
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def writexml( self, writer ):
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writer.write( "<!--" + self.data + "-->" )
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class ProcessingInstruction( Node ):
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nodeType=Node.PROCESSING_INSTRUCTION_NODE
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def __init__(self, target, data ):
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Node.__init__( self )
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self.target = self.nodeName = target
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self.data = self.nodeValue = data
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self.attributes=None
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def writexml( self, writer ):
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writer.write( "<?" + self.target +" " + self.data+ "?>" )
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class Text( Node ):
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nodeType=Node.TEXT_NODE
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nodeName="#text"
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def __init__(self, data ):
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Node.__init__( self )
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self.data = self.nodeValue = data
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self.attributes=None
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def __repr__(self):
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if len( self.data )> 10:
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dotdotdot="..."
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else:
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dotdotdot=""
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return "<DOM Text node \"" + self.data[0:10] + dotdotdot+"\">"
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def writexml( self, writer ):
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_write_data( writer, self.data )
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class Document( Node ):
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nodeType=Node.DOCUMENT_NODE
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def __init__( self ):
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Node.__init__( self )
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self.documentElement=None
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self.attributes=None
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self.nodeName="#document"
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self.nodeValue=None
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createElement=Element
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createTextNode=Text
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createComment=Comment
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createProcessingInstruction=ProcessingInstruction
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createAttribute=Attr
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def createElementNS(self, namespaceURI, qualifiedName):
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fields = string.split(qualifiedName, ':')
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if len(fields) == 2:
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prefix = fields[0]
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localName = fields[1]
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elif len(fields) == 1:
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prefix = ''
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localName = fields[0]
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return Element(self, qualifiedName, namespaceURI, prefix, localName)
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def createAttributeNS(self, namespaceURI, qualifiedName):
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fields = string.split(qualifiedName,':')
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if len(fields) == 2:
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localName = fields[1]
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prefix = fields[0]
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elif len(fields) == 1:
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localName = fields[0]
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prefix = None
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return Attr(qualifiedName, namespaceURI, prefix, localName)
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def getElementsByTagNameNS(self,namespaceURI,localName):
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_getElementsByTagNameNSHelper( self, namespaceURI, localName )
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def close( self ):
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for node in self.elements:
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_closeElement( node )
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def unlink( self ):
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self.documentElement=None
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Node.unlink( self )
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def getElementsByTagName( self, name ):
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rc=[]
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_getElementsByTagNameHelper( self, name, rc )
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return rc
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def writexml( self, writer ):
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for node in self.childNodes:
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node.writexml( writer )
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def _doparse( func, args, kwargs ):
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events=apply( func, args, kwargs )
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(toktype, rootNode)=events.getEvent()
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events.expandNode( rootNode )
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return rootNode
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def parse( *args, **kwargs ):
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return _doparse( pulldom.parse, args, kwargs )
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def parseString( *args, **kwargs ):
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return _doparse( pulldom.parseString, args, kwargs )
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@ -0,0 +1,267 @@
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import minidom
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import types
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import string
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import sys
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import pyexpat
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from xml.sax import ExpatParser
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#todo: SAX2/namespace handling
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START_ELEMENT="START_ELEMENT"
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END_ELEMENT="END_ELEMENT"
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COMMENT="COMMENT"
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START_DOCUMENT="START_DOCUMENT"
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END_DOCUMENT="END_DOCUMENT"
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PROCESSING_INSTRUCTION="PROCESSING_INSTRUCTION"
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IGNORABLE_WHITESPACE="IGNORABLE_WHITESPACE"
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CHARACTERS="CHARACTERS"
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class PullDOM:
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def __init__( self ):
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self.firstEvent=[None,None]
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self.lastEvent=self.firstEvent
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def setDocumentLocator( self, locator ): pass
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def startElement( self, tagName , attrs ):
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if not hasattr( self, "curNode" ):
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# FIXME: hack!
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self.startDocument( )
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node = self.document.createElement( tagName ) #FIXME namespaces!
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for attr in attrs.keys():
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node.setAttribute( attr, attrs[attr] )
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parent=self.curNode
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node.parentNode = parent
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if parent.childNodes:
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node.previousSibling=parent.childNodes[-1]
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node.previousSibling.nextSibling=node
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self.curNode = node
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# FIXME: do I have to screen namespace attributes
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self.lastEvent[1]=[(START_ELEMENT, node), None ]
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self.lastEvent=self.lastEvent[1]
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#self.events.append( (START_ELEMENT, node) )
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def endElement( self, name ):
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node = self.curNode
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self.lastEvent[1]=[(END_ELEMENT, node), None ]
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self.lastEvent=self.lastEvent[1]
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#self.events.append( (END_ELEMENT, node ))
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self.curNode = node.parentNode
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def comment( self, s):
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node = self.document.createComment ( s )
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parent=self.curNode
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node.parentNode=parent
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if parent.childNodes:
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node.previousSibling=parent.childNodes[-1]
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node.previousSibling.nextSibling=node
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self.lastEvent[1]=[(COMMENT, node), None ]
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self.lastEvent=self.lastEvent[1]
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#self.events.append( (COMMENT, node ))
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def processingInstruction( self, target, data ):
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node = self.document.createProcessingInstruction( target, data )
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#self.appendChild( node )
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parent=self.curNode
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node.parentNode=parent
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if parent.childNodes:
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node.previousSibling=parent.childNodes[-1]
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node.previousSibling.nextSibling=node
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self.lastEvent[1]=[(PROCESSING_INSTRUCTION, node), None ]
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self.lastEvent=self.lastEvent[1]
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#self.events.append( (PROCESSING_INSTRUCTION, node) )
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def ignorableWhitespace( self, chars ):
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node = self.document.createTextNode( chars[start:start+length] )
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parent=self.curNode
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node.parentNode=parent
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if parent.childNodes:
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node.previousSibling=parent.childNodes[-1]
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node.previousSibling.nextSibling=node
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self.lastEvent[1]=[(IGNORABLE_WHITESPACE, node), None ]
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self.lastEvent=self.lastEvent[1]
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#self.events.append( (IGNORABLE_WHITESPACE, node))
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def characters( self, chars ):
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node = self.document.createTextNode( chars )
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node.parentNode=self.curNode
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self.lastEvent[1]=[(CHARACTERS, node), None ]
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self.lastEvent=self.lastEvent[1]
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def startDocument( self ):
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node = self.curNode = self.document = minidom.Document()
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node.parentNode=None
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self.lastEvent[1]=[(START_DOCUMENT, node), None ]
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self.lastEvent=self.lastEvent[1]
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#self.events.append( (START_DOCUMENT, node) )
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def endDocument( self ):
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assert( not self.curNode.parentNode )
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for node in self.curNode.childNodes:
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if node.nodeType==node.ELEMENT_NODE:
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self.document.documentElement = node
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#if not self.document.documentElement:
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# raise Error, "No document element"
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self.lastEvent[1]=[(END_DOCUMENT, node), None ]
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#self.events.append( (END_DOCUMENT, self.curNode) )
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class ErrorHandler:
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def warning( self, exception ):
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print exception
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def error( self, exception ):
|
||||
raise exception
|
||||
def fatalError( self, exception ):
|
||||
raise exception
|
||||
|
||||
class DOMEventStream:
|
||||
def __init__( self, stream, parser, bufsize ):
|
||||
self.stream=stream
|
||||
self.parser=parser
|
||||
self.bufsize=bufsize
|
||||
self.reset()
|
||||
|
||||
def reset( self ):
|
||||
self.pulldom = PullDOM()
|
||||
self.parser.setContentHandler( self.pulldom )
|
||||
|
||||
def __getitem__( self, pos ):
|
||||
rc=self.getEvent()
|
||||
if rc: return rc
|
||||
raise IndexError
|
||||
|
||||
def expandNode( self, node ):
|
||||
event=self.getEvent()
|
||||
while event:
|
||||
token,cur_node=event
|
||||
if cur_node is node: return
|
||||
|
||||
if token !=END_ELEMENT:
|
||||
cur_node.parentNode.childNodes.append( cur_node )
|
||||
event=self.getEvent()
|
||||
if node.nodeType==minidom.Node.DOCUMENT_NODE:
|
||||
for child in node.childNodes:
|
||||
if child.nodeType==minidom.Node.ELEMENT_NODE:
|
||||
node.documentElement=child
|
||||
|
||||
def getEvent( self ):
|
||||
if not self.pulldom.firstEvent[1]:
|
||||
self.pulldom.lastEvent=self.pulldom.firstEvent
|
||||
while not self.pulldom.firstEvent[1]:
|
||||
buf=self.stream.read( self.bufsize )
|
||||
if not buf:
|
||||
#FIXME: why doesn't Expat close work?
|
||||
#self.parser.close()
|
||||
return None
|
||||
self.parser.feed( buf )
|
||||
rc=self.pulldom.firstEvent[1][0]
|
||||
self.pulldom.firstEvent[1]=self.pulldom.firstEvent[1][1]
|
||||
return rc
|
||||
|
||||
# FIXME: sax2
|
||||
#def _getParser( ):
|
||||
# from xml.sax.saxexts import make_parser
|
||||
# expat doesn't report errors properly! Figure it out
|
||||
# return make_parser()
|
||||
# return make_parser("xml.sax.drivers.drv_xmllib")
|
||||
|
||||
|
||||
|
||||
def _getParser():
|
||||
return ExpatParser()
|
||||
|
||||
default_bufsize=(2**14)-20
|
||||
# FIXME: move into sax package for common usage
|
||||
def parse( stream_or_string, parser=None, bufsize=default_bufsize ):
|
||||
if type( stream_or_string ) == type( "" ):
|
||||
stream=open( stream_or_string )
|
||||
else:
|
||||
stream=stream_or_string
|
||||
if not parser:
|
||||
parser=_getParser()
|
||||
return DOMEventStream( stream, parser, bufsize )
|
||||
|
||||
def parseString( string, parser=None ):
|
||||
try:
|
||||
import cStringIO
|
||||
stringio=cStringIO.StringIO
|
||||
except ImportError:
|
||||
import StringIO
|
||||
stringio=StringIO.StringIO
|
||||
|
||||
bufsize=len( string )
|
||||
stringio( string )
|
||||
parser=_getParser()
|
||||
return DOMEventStream( buf, parser, bufsize )
|
||||
|
||||
#FIXME: Use Lars' instead!!!
|
||||
class SAX_expat:
|
||||
"SAX driver for the Pyexpat C module."
|
||||
|
||||
def __init__(self):
|
||||
self.parser=pyexpat.ParserCreate()
|
||||
self.started=0
|
||||
|
||||
def setDocumentHandler( self, handler ):
|
||||
self.parser.StartElementHandler = handler.startElement
|
||||
self.parser.EndElementHandler = handler.endElement
|
||||
self.parser.CharacterDataHandler = handler.datachars
|
||||
self.parser.ProcessingInstructionHandler = handler.processingInstruction
|
||||
self.doc_handler=handler
|
||||
|
||||
def setErrorHandler( self, handler ):
|
||||
self.err_handler=handler
|
||||
|
||||
# --- Locator methods. Only usable after errors.
|
||||
|
||||
def getLineNumber(self):
|
||||
return self.parser.ErrorLineNumber
|
||||
|
||||
def getColumnNumber(self):
|
||||
return self.parser.ErrorColumnNumber
|
||||
|
||||
# --- Internal
|
||||
|
||||
def __report_error(self):
|
||||
msg=pyexpat.ErrorString(self.parser.ErrorCode)
|
||||
self.err_handler.fatalError(msg)
|
||||
|
||||
# --- EXPERIMENTAL PYTHON SAX EXTENSIONS
|
||||
|
||||
def get_parser_name(self):
|
||||
return "pyexpat"
|
||||
|
||||
def get_parser_version(self):
|
||||
return "Unknown"
|
||||
|
||||
def get_driver_version(self):
|
||||
return version
|
||||
|
||||
def is_validating(self):
|
||||
return 0
|
||||
|
||||
def is_dtd_reading(self):
|
||||
return 0
|
||||
|
||||
def reset(self):
|
||||
self.parser=pyexpat.ParserCreate()
|
||||
self.parser.StartElementHandler = self.startElement
|
||||
self.parser.EndElementHandler = self.endElement
|
||||
self.parser.CharacterDataHandler = self.characters
|
||||
self.parser.ProcessingInstructionHandler = self.processingInstruction
|
||||
|
||||
def feed(self,data):
|
||||
if not self.started:
|
||||
self.doc_handler.startDocument()
|
||||
self.started=1
|
||||
if not self.parser.Parse(data):
|
||||
self.__report_error()
|
||||
|
||||
def close(self):
|
||||
if not self.parser.Parse("",1):
|
||||
self.__report_error()
|
||||
self.doc_handler.endDocument()
|
||||
self.parser = None
|
||||
Loading…
Reference in New Issue