##### Helper functions

def map_items(func, items):

    return [(name, func(value)) for name, value in items]

def cast(type_, val):

    '''Throws FormatException if can't cast'''

    try: return type_(val)

    except ValueError, e: raise FormatException(e)

def conv_items(type_, items):

    return map_items(lambda val: cast(type_, val),

        xml_dom.TextEntryOnlyIter(items))

def pop_value(items, name='value'):

    '''@param name Name of value param, or None to accept any name'''

    try: last = items.pop() # last entry contains value

    except IndexError: return None # input is empty and no actions

    if name != None and last[0] != name: return None # input is empty

    return last[1]

##### Public functions

def strip(node):

    '''Replaces every XML function with its last parameter (which is usually its

    value)'''

    for child in xml_dom.NodeElemIter(node): strip(child)

    name = node.tagName

    if name.startswith('_') and name in funcs:

        value = pop_value(list(xml_dom.NodeTextEntryIter(node)), name=None)

        xml_dom.replace_with_text(node, value)