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