Example usage for org.antlr.v4.runtime.atn ParserATNSimulator setPredictionMode

Introduction

In this page you can find the example usage for org.antlr.v4.runtime.atn ParserATNSimulator setPredictionMode.

Prototype

public final void setPredictionMode(PredictionMode mode) 

Source Link

Usage

From source file:org.tvl.goworks.editor.go.parser.GoParserFactory.java

License:Open Source License

protected void configureParser(@NonNull Parser parser, @NonNull ParserConfiguration configuration) {
    ParserATNSimulator interpreter = parser.getInterpreter();

    // common configuration
    interpreter.force_global_context = false;
    interpreter.always_try_local_context = true;
    interpreter.optimize_tail_calls = true;
    parser.setBuildParseTree(true);/*from w  w  w .j av a  2 s.com*/
    parser.removeErrorListeners();

    switch (configuration) {
    case FASTEST:
        interpreter.setPredictionMode(PredictionMode.SLL);
        interpreter.tail_call_preserves_sll = false;
        interpreter.treat_sllk1_conflict_as_ambiguity = true;
        parser.setErrorHandler(new BailErrorStrategy());
        break;

    case SLL:
        throw new UnsupportedOperationException(
                "The tail_call_preserves_sll flag cannot change within a single ATN instance.");
        //interpreter.setPredictionMode(PredictionMode.SLL);
        //interpreter.tail_call_preserves_sll = true;
        //interpreter.treat_sllk1_conflict_as_ambiguity = true;
        //parser.setErrorHandler(new BailErrorStrategy<Token>());
        //break;

    case HYBRID:
        interpreter.setPredictionMode(PredictionMode.LL);
        interpreter.tail_call_preserves_sll = false;
        interpreter.treat_sllk1_conflict_as_ambiguity = true;
        parser.setErrorHandler(new BailErrorStrategy());
        break;

    case HYBRID_SLL:
        throw new UnsupportedOperationException(
                "The tail_call_preserves_sll flag cannot change within a single ATN instance.");
        //interpreter.setPredictionMode(PredictionMode.LL);
        //interpreter.tail_call_preserves_sll = true;
        //interpreter.treat_sllk1_conflict_as_ambiguity = true;
        //parser.setErrorHandler(new BailErrorStrategy<Token>());
        //break;

    case PRECISE:
        interpreter.setPredictionMode(PredictionMode.LL);
        interpreter.tail_call_preserves_sll = false;
        interpreter.treat_sllk1_conflict_as_ambiguity = false;
        parser.setErrorHandler(new DefaultErrorStrategy());
        parser.addErrorListener(DescriptiveErrorListener.INSTANCE);
        break;

    default:
        throw new IllegalArgumentException("Invalid configuration.");
    }
}

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