StyleRuleExecutor

The StyleRuleExecutor is a stateless virtual machine that accepts a context and executes one or more instructions of its rule, returning control immediately upon detecting that a derivative of the initial context has left the RUNNING state. The executor uses a supplied injector to feed forked contexts back into the pool of pending contexts. It should be run iteratively against a lineage of contexts and a sequence of classifiers. The special end-of-sequence classifier should terminate a sequence of classifiers (unless the rule rejects the sequence preemptively).