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node_modules/@jet/environment/util/rewindable-value.js

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