antlr4ts/tree/ParseTreeProperty.js

ANTLR 4 runtime for JavaScript written in Typescript

"use strict";
/*!
 * Copyright 2016 The ANTLR Project. All rights reserved.
 * Licensed under the BSD-3-Clause license. See LICENSE file in the project root for license information.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.ParseTreeProperty = void 0;
/**
 * Associate a property with a parse tree node. Useful with parse tree listeners
 * that need to associate values with particular tree nodes, kind of like
 * specifying a return value for the listener event method that visited a
 * particular node. Example:
 *
 * ```
 * ParseTreeProperty<Integer> values = new ParseTreeProperty<Integer>();
 * values.put(tree, 36);
 * int x = values.get(tree);
 * values.removeFrom(tree);
 * ```
 *
 * You would make one decl (values here) in the listener and use lots of times
 * in your event methods.
 */
class ParseTreeProperty {
    constructor(name = "ParseTreeProperty") {
        this._symbol = Symbol(name);
    }
    get(node) {
        return node[this._symbol];
    }
    set(node, value) {
        node[this._symbol] = value;
    }
    removeFrom(node) {
        let result = node[this._symbol];
        delete node[this._symbol];
        return result;
    }
}
exports.ParseTreeProperty = ParseTreeProperty;
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