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# XML DOM tree manipulation
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import cgi
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from HTMLParser import HTMLParser
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from xml.dom import Node
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import xml.dom.minidom as minidom
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import strings
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import util
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##### Escaping input
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def escape(str_):
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return strings.to_unicode(cgi.escape(str_, True)).encode('ascii',
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'xmlcharrefreplace')
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def unescape(str_): return HTMLParser().unescape(str_)
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##### IDs
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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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##### Element node contents
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def is_elem(node): return node.nodeType == Node.ELEMENT_NODE
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def is_completely_empty(node): return node.firstChild == None
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def has_one_child(node):
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return node.firstChild != None and node.firstChild.nextSibling == None
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def is_simple(node):
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'''Whether every child recursively has no more than one child'''
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return (not is_elem(node) or is_completely_empty(node)
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or (has_one_child(node) and is_simple(node.firstChild)))
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class NodeIter:
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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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if self.child != None: return self.child
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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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##### Comments
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def is_comment(node): return node.nodeType == Node.COMMENT_NODE
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def is_empty(node):
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for child in NodeIter(node):
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if not is_comment(child): return False
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return True
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##### Child nodes that are elements
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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 is_elem(self.child): 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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def has_elems(node):
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try: first_elem(node); return True
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except StopIteration: return False
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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 is_elem(self.child): 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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##### Parent nodes
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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 is_elem(self.node): 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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840
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##### Element nodes containing text
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def is_text_node(node): return node.nodeType == Node.TEXT_NODE
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def is_text(node): return has_one_child(node) and is_text_node(node.firstChild)
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def value(node):
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if node.firstChild != None: return node.firstChild.nodeValue
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else: return node.nodeValue
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def set_value(node, value):
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if is_elem(node): node.appendChild(node.ownerDocument.createTextNode(value))
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else: node.nodeValue = value
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class NodeTextEntryIter:
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def __init__(self, node): self.iter_ = NodeElemIter(node)
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def __iter__(self): return self
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def curr(self):
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entry = self.iter_.curr()
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if is_text(entry): value_ = value(entry)
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else:
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assert has_one_child(entry) # TODO: convert to an exception
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value_ = entry.firstChild
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return (entry.tagName, value_)
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def next(self):
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entry = self.curr()
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self.iter_.next()
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return entry
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def is_text_node_entry(val): return util.is_str(val[1])
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class TextEntryOnlyIter(util.CheckedIter):
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def __init__(self, iterable):
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util.CheckedIter.__init__(self, is_text_node_entry, iterable)
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##### Modifying/replacing a node
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def set_child(node, name, value):
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'''Note: does not remove any existing child of the same name'''
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child = node.ownerDocument.createElement(name)
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set_value(child, value)
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node.appendChild(child)
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def remove(node): node.parentNode.removeChild(node)
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def replace(old_node, new_node):
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old_node.parentNode.replaceChild(new_node, old_node) # note order reversed
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def replace_with_text(node, new):
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if util.is_str(new): new = node.ownerDocument.createTextNode(new)
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replace(node, new)
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##### Searching child nodes
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def by_tag_name(node, name, last_only=False):
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'''last_only optimization returns last matching node'''
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children = []
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if last_only: iter_ = NodeElemReverseIter(node)
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else: iter_ = NodeElemIter(node)
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for child in iter_:
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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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840
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##### XML documents
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def create_doc(root='_'):
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return minidom.getDOMImplementation().createDocument(None, root, None)
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840
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##### Printing XML
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prettyxml_config = dict(addindent=' ', newl='\n')
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toprettyxml_config = prettyxml_config.copy()
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util.rename_key(toprettyxml_config, 'addindent', 'indent')
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##### minidom modifications
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minidom._write_data = lambda writer, data: writer.write(escape(data))
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minidom.Node.__iter__ = lambda self: NodeIter(self)
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def __Node_str(self):
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return strings.remove_extra_newl(self.toprettyxml(**toprettyxml_config))
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minidom.Node.__str__ = __Node_str
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minidom.Node.__repr__ = __Node_str
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minidom.Element.__repr__ = __Node_str
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def __Attr_str(self): return self.name+'="'+escape(self.value)+'"'
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minidom.Attr.__str__ = __Attr_str
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minidom.Attr.__repr__ = __Attr_str
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minidom.Node.pop = lambda self: self.removeChild(self.lastChild)
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def __Node_clear(self):
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while not is_empty(self): self.pop()
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minidom.Node.clear = __Node_clear
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def __Element_write_opening(self, writer, indent='', addindent='', newl=''):
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writer.write(indent+'<'+self.tagName)
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for attr_idx in xrange(self.attributes.length):
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writer.write(' '+str(self.attributes.item(attr_idx)))
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writer.write('>'+newl)
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minidom.Element.write_opening = __Element_write_opening
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def __Element_write_closing(self, writer, indent='', addindent='', newl=''):
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writer.write('</'+self.tagName+'>'+newl)
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minidom.Element.write_closing = __Element_write_closing
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_writexml_orig = minidom.Element.writexml
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def __Element_writexml(self, writer, indent='', addindent='', newl=''):
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if isinstance(indent, int): indent = addindent*indent
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if is_simple(self):
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writer.write(indent)
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_writexml_orig(self, writer)
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writer.write(newl)
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else: _writexml_orig(self, writer, indent, addindent, newl)
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minidom.Element.writexml = __Element_writexml
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def __Document_write_opening(self, writer, indent='', addindent='', newl='',
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encoding=None):
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xmlDecl = '<?xml version="1.0" '
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if encoding != None: xmlDecl += 'encoding="'+escape(encoding)+'"'
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xmlDecl += '?>'+newl
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writer.write(xmlDecl)
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assert has_one_child(self)
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assert is_elem(self.firstChild)
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self.firstChild.write_opening(writer, indent, addindent, newl)
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minidom.Document.write_opening = __Document_write_opening
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def __Document_write_closing(self, writer, indent='', addindent='', newl=''):
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self.firstChild.write_closing(writer, indent, addindent, newl)
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minidom.Document.write_closing = __Document_write_closing
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