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21
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aaronmk
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# XML DOM tree manipulation
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from xml.dom import Node
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28
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aaronmk
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import xml.dom.minidom
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21
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aaronmk
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def name_of(node): return node.tagName.lower()
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def get_id(node): return node.getAttribute('id')
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def set_id(node, id_): node.setAttribute('id', id_)
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class NodeElemIter:
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def __init__(self, node): self.child = node.firstChild
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def __iter__(self): return self
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def curr(self):
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while self.child != None:
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if self.child.nodeType == Node.ELEMENT_NODE: return self.child
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self.child = self.child.nextSibling
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raise StopIteration
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def next(self):
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child = self.curr()
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self.child = self.child.nextSibling
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return child
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def first_elem(node): return NodeElemIter(node).next()
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class NodeElemReverseIter:
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def __init__(self, node): self.child = node.lastChild
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def __iter__(self): return self
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def curr(self):
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while self.child != None:
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if self.child.nodeType == Node.ELEMENT_NODE: return self.child
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self.child = self.child.previousSibling
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raise StopIteration
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def next(self):
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child = self.curr()
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self.child = self.child.previousSibling
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return child
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def last_elem(node): return NodeElemReverseIter(node).next()
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class NodeParentIter:
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def __init__(self, node): self.node = node
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def __iter__(self): return self
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def curr(self):
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if self.node != None and self.node.nodeType == Node.ELEMENT_NODE:
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return self.node
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raise StopIteration
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def next(self):
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node = self.curr()
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self.node = self.node.parentNode
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return node
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def is_text(node):
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for child in NodeElemIter(node): return False # has an element node
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return True
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def value(node):
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29
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aaronmk
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if node.firstChild != None: return node.firstChild.nodeValue
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21
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aaronmk
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else: return node.nodeValue
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aaronmk
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def set_value(doc, node, value):
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if node.nodeType == Node.ELEMENT_NODE:
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node.appendChild(doc.createTextNode(value))
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else: node.nodeValue = value
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def by_tag_name(node, name, last_only=False):
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aaronmk
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# last_only optimization returns last (most recently inserted) matching node
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aaronmk
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children = []
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aaronmk
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for child in NodeElemReverseIter(node):
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aaronmk
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if child.tagName == name:
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children.append(child)
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if last_only: break
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return children
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28
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aaronmk
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_writexml_orig = xml.dom.minidom.Element.writexml
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def _writexml(self, writer, indent="", addindent="", newl=""):
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36
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aaronmk
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if self.firstChild != None and self.firstChild.nextSibling == None\
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and self.firstChild.nodeType == Node.TEXT_NODE: # a single text node
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28
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aaronmk
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writer.write(indent+'<'+self.tagName)
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for attr_idx in range(self.attributes.length):
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attr = self.attributes.item(attr_idx)
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writer.write(' '+attr.name+'='+attr.value)
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writer.write('>'+value(self)+'</'+self.tagName+'>'+newl)
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else: _writexml_orig(self, writer, indent, addindent, newl)
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xml.dom.minidom.Element.writexml = _writexml
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