class Sprockets::DirectiveProcessor

for the complete API.
access the environment and append to the bundle. See `Context`
`context` is a `Context` instance with methods that allow you to

Implemented for Tilt#render.

def evaluate(context, locals, &block)
  @context = context
  @result = ""
  @has_written_body = false
  process_directives
  process_source
  @result
end