feat:node-modules

node_modules/mathjs/lib/esm/utils/lruQueue.js

@@ -0,0 +1,51 @@
+// (c) 2018, Mariusz Nowak
+// SPDX-License-Identifier: ISC
+// Derived from https://github.com/medikoo/lru-queue
+export function lruQueue(limit) {
+  var size = 0;
+  var base = 1;
+  var queue = Object.create(null);
+  var map = Object.create(null);
+  var index = 0;
+  var del = function del(id) {
+    var oldIndex = map[id];
+    if (!oldIndex) return;
+    delete queue[oldIndex];
+    delete map[id];
+    --size;
+    if (base !== oldIndex) return;
+    if (!size) {
+      index = 0;
+      base = 1;
+      return;
+    }
+    while (!Object.prototype.hasOwnProperty.call(queue, ++base)) {/* empty */}
+  };
+  limit = Math.abs(limit);
+  return {
+    hit: function hit(id) {
+      var oldIndex = map[id];
+      var nuIndex = ++index;
+      queue[nuIndex] = id;
+      map[id] = nuIndex;
+      if (!oldIndex) {
+        ++size;
+        if (size <= limit) return undefined;
+        id = queue[base];
+        del(id);
+        return id;
+      }
+      delete queue[oldIndex];
+      if (base !== oldIndex) return undefined;
+      while (!Object.prototype.hasOwnProperty.call(queue, ++base)) {/* empty */}
+      return undefined;
+    },
+    delete: del,
+    clear: function clear() {
+      size = index = 0;
+      base = 1;
+      queue = Object.create(null);
+      map = Object.create(null);
+    }
+  };
+}