Open sourceHEADmane

1 files changed, 92 insertions, 0 deletions

diff --git a/node_modules/async/internal/DoublyLinkedList.js b/node_modules/async/internal/DoublyLinkedList.js
new file mode 100644
index 0000000..cd11c3b
--- /dev/null
+++ b/node_modules/async/internal/DoublyLinkedList.js
@@ -0,0 +1,92 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+// Simple doubly linked list (https://en.wikipedia.org/wiki/Doubly_linked_list) implementation
+// used for queues. This implementation assumes that the node provided by the user can be modified
+// to adjust the next and last properties. We implement only the minimal functionality
+// for queue support.
+class DLL {
+    constructor() {
+        this.head = this.tail = null;
+        this.length = 0;
+    }
+
+    removeLink(node) {
+        if (node.prev) node.prev.next = node.next;else this.head = node.next;
+        if (node.next) node.next.prev = node.prev;else this.tail = node.prev;
+
+        node.prev = node.next = null;
+        this.length -= 1;
+        return node;
+    }
+
+    empty() {
+        while (this.head) this.shift();
+        return this;
+    }
+
+    insertAfter(node, newNode) {
+        newNode.prev = node;
+        newNode.next = node.next;
+        if (node.next) node.next.prev = newNode;else this.tail = newNode;
+        node.next = newNode;
+        this.length += 1;
+    }
+
+    insertBefore(node, newNode) {
+        newNode.prev = node.prev;
+        newNode.next = node;
+        if (node.prev) node.prev.next = newNode;else this.head = newNode;
+        node.prev = newNode;
+        this.length += 1;
+    }
+
+    unshift(node) {
+        if (this.head) this.insertBefore(this.head, node);else setInitial(this, node);
+    }
+
+    push(node) {
+        if (this.tail) this.insertAfter(this.tail, node);else setInitial(this, node);
+    }
+
+    shift() {
+        return this.head && this.removeLink(this.head);
+    }
+
+    pop() {
+        return this.tail && this.removeLink(this.tail);
+    }
+
+    toArray() {
+        return [...this];
+    }
+
+    *[Symbol.iterator]() {
+        var cur = this.head;
+        while (cur) {
+            yield cur.data;
+            cur = cur.next;
+        }
+    }
+
+    remove(testFn) {
+        var curr = this.head;
+        while (curr) {
+            var { next } = curr;
+            if (testFn(curr)) {
+                this.removeLink(curr);
+            }
+            curr = next;
+        }
+        return this;
+    }
+}
+
+exports.default = DLL;
+function setInitial(dll, node) {
+    dll.length = 1;
+    dll.head = dll.tail = node;
+}
+module.exports = exports["default"];
\ No newline at end of file