molstar
Version:
A comprehensive macromolecular library.
93 lines (92 loc) • 2.38 kB
JavaScript
"use strict";
/**
* Copyright (c) 2017 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author David Sehnal <david.sehnal@gmail.com>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.LinkedList = LinkedList;
function LinkedList() {
return new LinkedListImpl();
}
function createListNode(value) {
return { previous: null, next: null, inList: true, value };
}
class LinkedListImpl {
constructor() {
this.count = 0;
this.first = null;
this.last = null;
}
addFirst(value) {
const node = createListNode(value);
node.inList = true;
if (this.first)
this.first.previous = node;
node.next = this.first;
this.first = node;
this.count++;
if (!this.last)
this.last = node;
return node;
}
addLast(value) {
const node = createListNode(value);
if (this.last !== null) {
this.last.next = node;
}
node.previous = this.last;
this.last = node;
if (this.first === null) {
this.first = node;
}
node.inList = true;
this.count++;
return node;
}
removeFirst() {
const fst = this.first;
if (fst) {
this.remove(fst);
return fst.value;
}
return void 0;
}
removeLast() {
const last = this.last;
if (last) {
this.remove(last);
return last.value;
}
return void 0;
}
remove(node) {
if (!node.inList)
return;
node.inList = false;
if (node.previous !== null) {
node.previous.next = node.next;
}
else if ( /* first == item*/node.previous === null) {
this.first = node.next;
}
if (node.next !== null) {
node.next.previous = node.previous;
}
else if ( /* last == item*/node.next === null) {
this.last = node.previous;
}
node.next = null;
node.previous = null;
this.count--;
}
find(value) {
let current = this.first;
while (current !== null) {
if (current.value === value)
return current;
current = current.next;
}
return void 0;
}
}