antlr4-runtime/src/antlr4/transition/PredicateTransition.js

JavaScript runtime for ANTLR4

/* Copyright (c) 2012-2022 The ANTLR Project Contributors. All rights reserved.
 * Use is of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
import Predicate from "../atn/Predicate.js";
import Transition from "./Transition.js";
import AbstractPredicateTransition from "../atn/AbstractPredicateTransition.js";

export default class PredicateTransition extends AbstractPredicateTransition {
    constructor(target, ruleIndex, predIndex, isCtxDependent) {
        super(target);
        this.serializationType = Transition.PREDICATE;
        this.ruleIndex = ruleIndex;
        this.predIndex = predIndex;
        this.isCtxDependent = isCtxDependent; // e.g., $i ref in pred
        this.isEpsilon = true;
    }

    matches(symbol, minVocabSymbol, maxVocabSymbol) {
        return false;
    }

    getPredicate() {
        return new Predicate(this.ruleIndex, this.predIndex, this.isCtxDependent);
    }

    toString() {
        return "pred_" + this.ruleIndex + ":" + this.predIndex;
    }
}