1
2/**
3 * @constructor SLL
4 *
5 * @param head The head of the list.
6 * @param klass The reference to the SLLNode class
7 * @param size the size or length of the list.
8 * @arguments <klass:SLLNode>
9 * @description The SLL Factory
10 *
11 */
12export function SLL(klass = Node) {
13    this.head = new Node();
14    this.klass = Node;
15    this.size = 0;
16}
17
18/**
19 * @function Add|Method
20 *
21 * @returns SLLNode
22 * @param node The node you will append
23 * @arguments <key:string>
24 * @description A method that will insert a new node at the beginning of the
25 * list.
26 */
27SLL.prototype.add = function insert(key) {
28    const node = new this.klass(key);
29    this.head = this.head.add(node);
30    this.size++;
31    return this;
32}
33
34/**
35 * @function Find|Method
36 *
37 * @returns SLLNode
38 * @param key The key of the node you wish to find.
39 * @arguments <key:string>
40 * @description A method that will retireve a node associated with the
41 * corrosponding key.
42 */
43SLL.prototype.find = function find(key) {
44    return this.head && this.head.find(key);
45}
46
47/**
48 * @function Insert|Method
49 *
50 * @returns SLLNode
51 * @param key The key of the node you wish to append a new node.
52 * @param key1 The key of the node you wish to insert
53 * @arguments <key:string>, <key1:string>
54 * @description A method that will insert a new node into the middle of the
55 * list
56 */
57SLL.prototype.insert = function insert(key, key1) {
58    const node = new this.klass(key1);
59    return this.head && this.head.insert(key, node);
60}
61
62/**
63 * @function Del|Method
64 *
65 * @returns SLLNode
66 * @param key The key of the node you wish to delete.
67 * @arguments <key:string>
68 * @description A method that will delete a node associated with the
69 * corrosponding key.
70 */
71SLL.prototype.del = function del(key) {
72    return this.head.del(key);
73}
74
75/**
76 * @returns SLLNode
77 * @param key The key of the node you wish to create.
78 * @arguments <key:null?string>
79 * @description The SLLNode Interface
80 *
81 * @interface ISLLNode
82 */
83function ISSLNode(key=null) {
84    this.key = key;
85    this.next = null;
86}
87
88/**
89 * @constructor SLLNode
90 *
91 * @param key The key of the node you wish to create.
92 * @arguments <key:null?string>
93 * @description The SLLNode Factory
94 * 
95 * @implements ISLLNode
96 */
97export function SLLNode(key=null) {
98    ISSLNode.call(this, key=null);
99}
100
101/**
102 * @function Add|Method
103 *
104 * @returns SLLNode
105 * @param node The node you will append
106 * @arguments <node:SLLNode>
107 * @description A method that will insert a new node at the beginning of the
108 * list.
109 */
110SLLNode.prototype.add = function add(node) {
111    if(!this.key && !this.next) {
112        this.key = node.key;
113        this.next = node.next;
114        return node;
115    }
116    node.next = this;
117    return node;
118}
119
120/**
121 * @function Find|Method
122 *
123 * @returns SLLNode
124 * @param key The key of the node you wish to find.
125 * @arguments <key:string>
126 * @description A method that will retireve a node associated with the 
127 * corrosponding key.
128 */
129SLLNode.prototype.find = function find(key) {
130    if (this.key === key) {
131        this.next = null;
132        return this;
133    }
134    if (this.key !== key) {
135        if(!this.next) {
136            return 0;
137        }
138        return this.next.find(key);
139    }
140}
141
142/**
143 * @function Insert|Method
144 *
145 * @returns SLLNode
146 * @param key The key of the node you wish to append a new node.
147 * @param node The node you will append
148 * @arguments <key:string>, <node:SLLNode>
149 * @description A method that will insert a new node into the middle of the
150 * list
151 */
152SLLNode.prototype.insert = function insert(key, node) {
153    if (this.key === key) {
154        let tmp = this.next;
155        this.next = node;
156        node.next = tmp;
157        return node;
158    }
159    if (this.key !== key) {
160        if (!this.next) {
161            return 0;
162        }
163        return this.next.insert(key, node);
164    }
165}
166
167/**
168 * @function Del|Method
169 *
170 * @returns SLLNode
171 * @param key The key of the node you wish to delete.
172 * @param pre 
173 * @arguments <key:string>, <pre:null?SLLNode>
174 * @description A method that will delete a node associated with the
175 * corrosponding key.
176 */
177SLLNode.prototype.del = function del(key, pre=null) {
178    if (this.key === key) {
179       let tmp = this.next;
180       pre.next = tmp;
181        return this;
182    }
183    if (this.key !== key) {
184        if (!this.next) {
185            return 0;
186        }
187        return this.next.del(key, this);
188    }
189}