ParserFactory.java 文件源码

@Override
public Choice getEBNFBlock(GrammarAST ebnfRoot, List<CodeBlockForAlt> alts) {
    if (!g.tool.force_atn) {
        int decision;
        if ( ebnfRoot.getType()==ANTLRParser.POSITIVE_CLOSURE ) {
            decision = ((PlusLoopbackState)ebnfRoot.atnState).decision;
        }
        else if ( ebnfRoot.getType()==ANTLRParser.CLOSURE ) {
            decision = ((StarLoopEntryState)ebnfRoot.atnState).decision;
        }
        else {
            decision = ((DecisionState)ebnfRoot.atnState).decision;
        }

        if ( AnalysisPipeline.disjoint(g.decisionLOOK.get(decision)) ) {
            return getLL1EBNFBlock(ebnfRoot, alts);
        }
    }

    return getComplexEBNFBlock(ebnfRoot, alts);
}