141 lines
3.8 KiB
TypeScript
141 lines
3.8 KiB
TypeScript
module Editor {
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export class List<T> {
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public next: List<T>;
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public prev: List<T>;
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private listFactory: ListFactory<T>;
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constructor(public isHead: boolean, public data: T) {
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this.listFactory = new ListFactory<T>();
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}
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public add(data: T): List<T> {
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var entry = this.listFactory.MakeEntry(data);
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this.prev.next = entry;
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entry.next = this;
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entry.prev = this.prev;
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this.prev = entry;
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return entry;
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}
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public count(): number {
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var entry: List<T>;
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var i: number;
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entry = this.next;
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for (i = 0; !(entry.isHead); i++) {
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entry = entry.next;
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}
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return (i);
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}
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public isEmpty(): boolean {
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return (this.next == this);
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}
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public first(): T {
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if (this.isEmpty())
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{
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return this.next.data;
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}
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else {
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return null;
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}
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}
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public pushEntry(entry: List<T>): void {
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entry.isHead = false;
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entry.next = this.next;
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entry.prev = this;
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this.next = entry;
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entry.next.prev = entry; // entry.next.prev does not show intellisense, but entry.prev.prev does
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}
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public push(data: T): void {
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var entry = this.listFactory.MakeEntry(data);
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entry.data = data;
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entry.isHead = false;
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entry.next = this.next;
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entry.prev = this;
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this.next = entry;
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entry.next.prev = entry; // entry.next.prev does not show intellisense, but entry.prev.prev does
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}
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public popEntry(head: List<T>): List<T> {
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if (this.next.isHead) {
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return null;
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}
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else {
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return this.listFactory.RemoveEntry(this.next);
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}
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}
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public insertEntry(entry: List<T>): List<T> {
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entry.isHead = false;
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this.prev.next = entry;
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entry.next = this;
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entry.prev = this.prev;
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this.prev = entry;
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return entry;
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}
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public insertAfter(data: T): List<T> {
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var entry: List<T> = this.listFactory.MakeEntry(data);
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entry.next = this.next;
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entry.prev = this;
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this.next = entry;
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entry.next.prev = entry;// entry.next.prev does not show intellisense, but entry.prev.prev does
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return entry;
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}
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public insertEntryBefore(entry: List<T>): List<T> {
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this.prev.next = entry;
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entry.next = this;
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entry.prev = this.prev;
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this.prev = entry;
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return entry;
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}
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public insertBefore(data: T): List<T> {
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var entry = this.listFactory.MakeEntry(data);
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return this.insertEntryBefore(entry);
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}
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}
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export class ListFactory<T> {
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public MakeHead<T>(): List<T> {
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var entry: List<T> = new List<T>(true, null);
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entry.prev = entry;
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entry.next = entry;
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return entry;
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}
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public MakeEntry<T>(data: T): List<T> {
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var entry: List<T> = new List<T>(false, data);
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entry.prev = entry;
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entry.next = entry;
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return entry;
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}
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public RemoveEntry<T>(entry: List<T>): List<T> {
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if (entry == null) {
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return null;
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}
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else if (entry.isHead) {
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// Can't remove the head of a list!
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return null;
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}
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else {
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entry.next.prev = entry.prev;
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entry.prev.next = entry.next;
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return entry;
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}
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}
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}
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} |