PreviewParser.java 文件源码

@Override
    protected int visitDecisionState(DecisionState p) {
        int predictedAlt = super.visitDecisionState(p);
        if ( p.getNumberOfTransitions()>1 ) {
//          System.out.println("decision "+p.decision+": "+predictedAlt);
            if ( p.decision==this.overrideDecision &&
            this._input.index()==this.overrideDecisionInputIndex ) {
                ((PreviewInterpreterRuleContext)overrideDecisionRoot).isDecisionOverrideRoot = true;
            }
        }
        return predictedAlt;
    }