cfyaml.py 文件源码

def from_yaml(cls, loader, node):
        key = node.tag[1:]
        if node.tag not in ('!Ref', '!Condition'):
            key = 'Fn::' + key
        if isinstance(node, ScalarNode):
            val = loader.construct_scalar(node)
        elif isinstance(node, SequenceNode):
            val = loader.construct_sequence(node)
        elif isinstance(node, MappingNode):
            val = loader.construct_mapping(node)
        else:
            raise Exception("Unable to handle node: %r"%node)
        return {str(key): str(val)}