ExtractVariables returns a map of all the variables defined in the specified compose file (dict representation) and their default value if any.

Substitute variables in the string with their values.

SubstituteWith substitute variables in the string with their values.

SubstituteWithOptions substitute variables in the string with their values.

InvalidTemplateError is returned when a variable template is not in a valid format.

MissingRequiredError is returned when a variable template is missing.

Mapping is a user-supplied function which maps from variable names to values.

ReplacementFunc is a user-supplied function that is apply to the matching substring.

SubstituteFunc is a user-supplied function that apply substitution.