BoaCompiler.java 文件源码

private static Start parse(final CommonTokenStream tokens, final BoaParser parser, final BoaErrorListener parserErrorListener) {
    parser.setBuildParseTree(false);
    parser.getInterpreter().setPredictionMode(PredictionMode.SLL);

    try {
        return parser.start().ast;
    } catch (final ParseCancellationException e) {
        // fall-back to LL mode parsing if SLL fails
        tokens.reset();
        parser.reset();

        parser.removeErrorListeners();
        parser.addErrorListener(parserErrorListener);
        parser.getInterpreter().setPredictionMode(PredictionMode.LL);

        return parser.start().ast;
    }
}