mirror of https://github.com/python/cpython.git
581 lines
18 KiB
Python
581 lines
18 KiB
Python
"""\
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minidom.py -- a lightweight DOM implementation based on SAX.
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parse( "foo.xml" )
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parseString( "<foo><bar/></foo>" )
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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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import string
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_string = string
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del string
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# localize the types, and allow support for Unicode values if available:
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import types
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_TupleType = types.TupleType
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try:
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_StringTypes = (types.StringType, types.UnicodeType)
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except AttributeError:
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_StringTypes = (types.StringType,)
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del types
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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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_debug = 0
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_makeParentNodes = 1
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debug = None
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def __init__(self):
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self.childNodes = []
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if Node._debug:
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index = repr(id(self)) + repr(self.__class__)
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Node.allnodes[index] = repr(self.__dict__)
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if Node.debug is None:
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Node.debug = _get_StringIO()
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#open( "debug4.out", "w" )
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Node.debug.write("create %s\n" % index)
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def __getattr__(self, key):
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if key[0:2] == "__":
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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):
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return 1
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def toxml(self):
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writer = _get_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:
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return 1
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else:
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return 0
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def _get_firstChild(self):
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if self.childNodes:
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return self.childNodes[0]
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def _get_lastChild(self):
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if self.childNodes:
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return self.childNodes[-1]
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def insertBefore(self, newChild, refChild):
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if refChild is None:
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self.appendChild(newChild)
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else:
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index = self.childNodes.index(refChild)
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self.childNodes.insert(index, newChild)
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newChild.nextSibling = refChild
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refChild.previousSibling = newChild
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if index:
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node = self.childNodes[index-1]
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node.nextSibling = newChild
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newChild.previousSibling = node
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else:
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newChild.previousSibling = None
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if self._makeParentNodes:
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newChild.parentNode = self
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return newChild
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def appendChild(self, node):
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if self.childNodes:
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last = self.lastChild
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node.previousSibling = last
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last.nextSibling = node
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else:
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node.previousSibling = None
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node.nextSibling = None
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self.childNodes.append(node)
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if self._makeParentNodes:
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node.parentNode = self
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return node
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def replaceChild(self, newChild, oldChild):
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if newChild is oldChild:
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return
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index = self.childNodes.index(oldChild)
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self.childNodes[index] = newChild
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if self._makeParentNodes:
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newChild.parentNode = self
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oldChild.parentNode = None
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newChild.nextSibling = oldChild.nextSibling
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newChild.previousSibling = oldChild.previousSibling
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oldChild.newChild = None
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oldChild.previousSibling = None
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return oldChild
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def removeChild(self, oldChild):
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self.childNodes.remove(oldChild)
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if self._makeParentNodes:
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oldChild.parentNode = None
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return oldChild
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def normalize(self):
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if len(self.childNodes) > 1:
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L = [self.childNodes[0]]
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for child in self.childNodes[1:]:
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if ( child.nodeType == Node.TEXT_NODE
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and L[-1].nodeType == child.nodeType):
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# collapse text node
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node = L[-1]
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node.data = node.nodeValue = node.data + child.data
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node.nextSibling = child.nextSibling
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child.unlink()
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else:
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L[-1].nextSibling = child
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child.previousSibling = L[-1]
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L.append(child)
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child.normalize()
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self.childNodes = L
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elif self.childNodes:
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# exactly one child -- just recurse
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self.childNodes[0].normalize()
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def cloneNode(self, deep):
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import new
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clone = new.instance(self.__class__, self.__dict__.copy())
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if self._makeParentNodes:
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clone.parentNode = None
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clone.childNodes = []
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if deep:
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for child in self.childNodes:
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clone.appendChild(child.cloneNode(1))
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return clone
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def unlink(self):
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self.parentNode = None
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for child in self.childNodes:
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child.unlink()
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self.childNodes = None
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self.previousSibling = None
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self.nextSibling = None
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if Node._debug:
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index = repr(id(self)) + repr(self.__class__)
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self.debug.write("Deleting: %s\n" % index)
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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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replace = _string.replace
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data = replace(data, "&", "&")
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data = replace(data, "<", "<")
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data = replace(data, "\"", """)
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data = replace(data, ">", ">")
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writer.write(data)
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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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attributes = None
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ownerElement = None
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def __init__(self, qName, namespaceURI="", localName=None, prefix=None):
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# skip setattr for performance
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d = self.__dict__
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d["localName"] = localName or qName
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d["nodeName"] = d["name"] = qName
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d["namespaceURI"] = namespaceURI
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d["prefix"] = prefix
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Node.__init__(self)
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# nodeValue and value are set elsewhere
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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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def cloneNode(self, deep):
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clone = Node.cloneNode(self, deep)
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if clone.__dict__.has_key("ownerElement"):
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del clone.ownerElement
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return clone
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class AttributeList:
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"""The attribute list is a transient interface to the underlying
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dictionaries. Mutations here will change the underlying element's
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dictionary"""
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def __init__(self, attrs, attrsNS):
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self._attrs = attrs
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self._attrsNS = attrsNS
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self.length = len(self._attrs)
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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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L = []
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for node in self._attrs.values():
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L.append((node.tagName, node.value))
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return L
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def itemsNS(self):
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L = []
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for node in self._attrs.values():
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L.append(((node.URI, node.localName), node.value))
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return L
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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 getattr(other, "_attrs", None):
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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) is _TupleType:
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return self._attrsNS[attname_or_tuple]
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else:
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return self._attrs[attname_or_tuple]
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# same as set
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def __setitem__(self, attname, value):
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if type(value) in _StringTypes:
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node = Attr(attname)
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node.value = value
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else:
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if not isinstance(value, Attr):
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raise TypeError, "value must be a string or Attr object"
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node = value
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old = self._attrs.get(attname, None)
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if old:
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old.unlink()
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self._attrs[node.name] = node
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self._attrsNS[(node.namespaceURI, node.localName)] = node
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def __delitem__(self, attname_or_tuple):
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node = self[attname_or_tuple]
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node.unlink()
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del self._attrs[node.name]
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del self._attrsNS[(node.namespaceURI, node.localName)]
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class Element(Node):
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nodeType = Node.ELEMENT_NODE
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nextSibling = None
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previousSibling = None
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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
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# of attribute objects this is too tricky
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# for now because of headaches with
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# namespaces.
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def cloneNode(self, deep):
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clone = Node.cloneNode(self, deep)
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clone._attrs = {}
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clone._attrsNS = {}
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for attr in self._attrs.values():
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node = attr.cloneNode(1)
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clone._attrs[node.name] = node
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clone._attrsNS[(node.namespaceURI, node.localName)] = node
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node.ownerElement = clone
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return clone
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def unlink(self):
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for attr in self._attrs.values():
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attr.unlink()
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self._attrs = None
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self._attrsNS = None
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Node.unlink(self)
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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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prefix, localname = _nssplit(qualifiedName)
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# for performance
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attr = Attr(qualifiedName, namespaceURI, localname, prefix)
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attr.__dict__["value"] = attr.__dict__["nodeValue"] = value
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self.setAttributeNode(attr)
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def getAttributeNode(self, attrname):
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return self._attrs.get(attrname)
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def getAttributeNodeNS(self, namespaceURI, localName):
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return self._attrsNS[(namespaceURI, localName)]
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def setAttributeNode(self, attr):
|
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if attr.ownerElement not in (None, self):
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raise ValueError, "attribute node already owned"
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old = self._attrs.get(attr.name, None)
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if old:
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old.unlink()
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self._attrs[attr.name] = attr
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self._attrsNS[(attr.namespaceURI, attr.localName)] = attr
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|
|
# This creates a circular reference, but Element.unlink()
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# breaks the cycle since the references to the attribute
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# dictionaries are tossed.
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attr.ownerElement = self
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|
if old is not attr:
|
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# It might have already been part of this node, in which case
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# it doesn't represent a change, and should not be returned.
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return old
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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[(namespaceURI, localName)]
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self.removeAttributeNode(attr)
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|
|
def removeAttributeNode(self, node):
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node.unlink()
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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):
|
|
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):
|
|
return "<DOM Element: %s at %s>" % (self.tagName, id(self))
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|
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|
def writexml(self, writer):
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|
writer.write("<" + self.tagName)
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|
attrs = self._get_attributes()
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|
a_names = attrs.keys()
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a_names.sort()
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|
|
|
for a_name in a_names:
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writer.write(" %s=\"" % a_name)
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|
_write_data(writer, attrs[a_name].value)
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|
writer.write("\"")
|
|
if self.childNodes:
|
|
writer.write(">")
|
|
for node in self.childNodes:
|
|
node.writexml(writer)
|
|
writer.write("</%s>" % self.tagName)
|
|
else:
|
|
writer.write("/>")
|
|
|
|
def _get_attributes(self):
|
|
return AttributeList(self._attrs, self._attrsNS)
|
|
|
|
class Comment(Node):
|
|
nodeType = Node.COMMENT_NODE
|
|
nodeName = "#comment"
|
|
attributes = None
|
|
|
|
def __init__(self, data):
|
|
Node.__init__(self)
|
|
self.data = self.nodeValue = data
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|
|
|
def writexml(self, writer):
|
|
writer.write("<!--%s-->" % self.data)
|
|
|
|
class ProcessingInstruction(Node):
|
|
nodeType = Node.PROCESSING_INSTRUCTION_NODE
|
|
attributes = None
|
|
|
|
def __init__(self, target, data):
|
|
Node.__init__(self)
|
|
self.target = self.nodeName = target
|
|
self.data = self.nodeValue = data
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|
|
|
def writexml(self, writer):
|
|
writer.write("<?%s %s?>" % (self.target, self.data))
|
|
|
|
class Text(Node):
|
|
nodeType = Node.TEXT_NODE
|
|
nodeName = "#text"
|
|
attributes = None
|
|
|
|
def __init__(self, data):
|
|
Node.__init__(self)
|
|
self.data = self.nodeValue = data
|
|
|
|
def __repr__(self):
|
|
if len(self.data) > 10:
|
|
dotdotdot = "..."
|
|
else:
|
|
dotdotdot = ""
|
|
return "<DOM Text node \"%s%s\">" % (self.data[0:10], dotdotdot)
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|
|
|
def writexml(self, writer):
|
|
_write_data(writer, self.data)
|
|
|
|
def _nssplit(qualifiedName):
|
|
fields = _string.split(qualifiedName, ':', 1)
|
|
if len(fields) == 2:
|
|
return fields
|
|
elif len(fields) == 1:
|
|
return ('', fields[0])
|
|
|
|
class Document(Node):
|
|
nodeType = Node.DOCUMENT_NODE
|
|
nodeName = "#document"
|
|
nodeValue = None
|
|
attributes = None
|
|
documentElement = None
|
|
|
|
def appendChild(self, node):
|
|
if node.nodeType == Node.ELEMENT_NODE:
|
|
if self.documentElement:
|
|
raise TypeError, "Two document elements disallowed"
|
|
else:
|
|
self.documentElement = node
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|
return Node.appendChild(self, node)
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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):
|
|
prefix, localName = _nssplit(qualifiedName)
|
|
return self.createElement(qualifiedName, namespaceURI,
|
|
prefix, localName)
|
|
|
|
def createAttributeNS(self, namespaceURI, qualifiedName):
|
|
prefix, localName = _nssplit(qualifiedName)
|
|
return self.createAttribute(qualifiedName, namespaceURI,
|
|
localName, prefix)
|
|
|
|
def getElementsByTagNameNS(self, namespaceURI, localName):
|
|
_getElementsByTagNameNSHelper(self, namespaceURI, localName)
|
|
|
|
def unlink(self):
|
|
self.documentElement = None
|
|
Node.unlink(self)
|
|
|
|
def getElementsByTagName(self, name):
|
|
rc = []
|
|
_getElementsByTagNameHelper(self, name, rc)
|
|
return rc
|
|
|
|
def writexml(self, writer):
|
|
for node in self.childNodes:
|
|
node.writexml(writer)
|
|
|
|
def _get_StringIO():
|
|
try:
|
|
from cStringIO import StringIO
|
|
except ImportError:
|
|
from StringIO import StringIO
|
|
return StringIO()
|
|
|
|
def _doparse(func, args, kwargs):
|
|
events = apply(func, args, kwargs)
|
|
toktype, rootNode = events.getEvent()
|
|
events.expandNode(rootNode)
|
|
return rootNode
|
|
|
|
def parse(*args, **kwargs):
|
|
"Parse a file into a DOM by filename or file object"
|
|
from xml.dom import pulldom
|
|
return _doparse(pulldom.parse, args, kwargs)
|
|
|
|
def parseString(*args, **kwargs):
|
|
"Parse a file into a DOM from a string"
|
|
from xml.dom import pulldom
|
|
return _doparse(pulldom.parseString, args, kwargs)
|