ifconfig.py 文件源码

def process_ifconfig_nodes(app, doctree, docname):
    ns = dict((k, app.config[k]) for k in app.config.values)
    ns.update(app.config.__dict__.copy())
    ns['builder'] = app.builder.name
    for node in doctree.traverse(ifconfig):
        try:
            res = eval(node['expr'], ns)
        except Exception as err:
            # handle exceptions in a clean fashion
            from traceback import format_exception_only
            msg = ''.join(format_exception_only(err.__class__, err))
            newnode = doctree.reporter.error('Exception occured in '
                                             'ifconfig expression: \n%s' %
                                             msg, base_node=node)
            node.replace_self(newnode)
        else:
            if not res:
                node.replace_self([])
            else:
                node.replace_self(node.children)