Module substitution_args

Resolves substitution args (see wiki spec http://ros.org/wiki/roslaunch).

Parameters:

• arg_str (str) - string to resolve zero or more substitution args in. arg_str may be None, in which case resolve_args will return None
• context (dict), dict - (optional) dictionary for storing results of the 'anon' and 'arg' substitution args. multiple calls to resolve_args should use the same context so that 'anon' substitions resolve consistently. If no context is provided, a new one will be created for each call. Values for the 'arg' context should be stored as a dictionary in the 'arg' key.
• resolve_anon (bool), bool - If True (default), will resolve $(anon foo). If false, will leave these args as-is.

Returns: str

Raises:

• SubstitutionException - if there is an error resolving substitution args