from xml.dom.core import *

def explode(nodes, condition):
    for node in nodes:
        explode_node(node, condition)

    return nodes

def explode_node(node, condition):
    if node.NodeType != ELEMENT:
        return node

    explode(node.getChildren(), condition)

    if eval(condition, {}, {'this': node}):
        parent = node.getParentNode()
        for child in node.getChildren():
            parent.insertBefore(child, node)
        parent.removeChild(node)

    return node
        
        
if __name__ == '__main__':
    from xml.dom.writer import HtmlWriter

    tree = HTML(BODY(H1(A({'href':'blah'}, 'blah blah'))))
    w = HtmlWriter()
    w.write(tree)

    explode_node(tree, 'this.GI == "A"')
    w.write(tree)