Current Dev State

static/js/ketcher2/node_modules/yapool/index.js

@@ -0,0 +1,56 @@
+module.exports = Pool
+
+function Pool () {
+  this.length = 0
+  this.head = null
+  this.tail = null
+}
+
+Pool.prototype.add = function (data) {
+  this.tail = new Item(data, this.tail, null)
+  if (!this.head)
+    this.head = this.tail
+  this.length ++
+}
+
+Pool.prototype.remove = function (data) {
+  if (this.length === 0)
+    return
+
+  var i = this.head.find(data)
+
+  if (!i)
+    return
+
+  if (i === this.head)
+    this.head = this.head.next
+
+  if (i === this.tail)
+    this.tail = this.tail.prev
+
+  i.remove()
+  this.length --
+}
+
+function Item (data, prev) {
+  this.prev = prev
+  if (prev)
+    prev.next = this
+
+  this.next = null
+  this.data = data
+}
+
+Item.prototype.remove = function () {
+  if (this.next)
+    this.next.prev = this.prev
+  if (this.prev)
+    this.prev.next = this.next
+  this.prev = this.next = this.data = null
+}
+
+Item.prototype.find = function (data) {
+  return data === this.data ? this
+  : this.next ? this.next.find(data)
+  : null
+}