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58 lines
1.6 KiB
JavaScript
58 lines
1.6 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.RewindableValue = void 0;
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const clone_1 = require("./clone");
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/* eslint-disable no-underscore-dangle */
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/**
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* A lightweight wrapper around a primitive value which allows its state
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* to saved and later restored.
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*/
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class RewindableValue {
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/**
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* Create a rewindable value.
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*
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* @param initialValue - The initial value for the new instance.
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*/
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constructor(initialValue) {
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this._values = [initialValue];
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}
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/**
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* Returns the current value of this instance.
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*/
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get() {
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return this._values[this._values.length - 1];
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}
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/**
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* Replace the current value of this instance.
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*
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* @param newValue - The value to assign this instance.
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*/
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set(newValue) {
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this._values[this._values.length - 1] = newValue;
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}
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/**
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* Save the current state of this value.
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*
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* Calls to this method should be balanced by calls to `restore`.
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*/
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save() {
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this._values.push(this._values[this._values.length - 1]);
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}
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/**
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* Restore a previously saved value.
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*/
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restore() {
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if (this._values.length === 1) {
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throw new RangeError("Calls to restore must balance previous calls to save");
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}
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this._values.pop();
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}
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// section Cloneable
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clone() {
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const copy = (0, clone_1.shallowCloneOf)(this);
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copy._values = this._values.slice();
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return copy;
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}
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}
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exports.RewindableValue = RewindableValue;
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//# sourceMappingURL=rewindable-value.js.map
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