Source code for sceptre.resolvers.join

from sceptre.resolvers import Resolver

[docs]class Join(Resolver): """This resolver allows you to join multiple strings together to form a single string. This is great for combining the outputs of multiple resolvers. This resolver works just like CloudFormation's ``!Join`` intrinsic function. The argument for this resolver should be a list with two elements: (1) A string to join the elements on and (2) a list of items to join. Example: parameters: BaseUrl: !join - ":" - - !stack_output my/app/stack.yaml::HostName - !stack_output my/other/stack.yaml::Port """
[docs] def resolve(self): error_message = ( "The argument to !join must be a 2-element list, where the first element is the join " "string and the second is a list of items to join." ) if not isinstance(self.argument, list) or len(self.argument) != 2: self.raise_invalid_argument_error(error_message) delimiter, items_list = self.argument if not isinstance(delimiter, str) or not isinstance(items_list, list): self.raise_invalid_argument_error(error_message) string_items = map(str, items_list) joined = delimiter.join(string_items) return joined