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  1. export class Yallist {
  2. tail;
  3. head;
  4. length = 0;
  5. static create(list = []) {
  6. return new Yallist(list);
  7. }
  8. constructor(list = []) {
  9. for (const item of list) {
  10. this.push(item);
  11. }
  12. }
  13. *[Symbol.iterator]() {
  14. for (let walker = this.head; walker; walker = walker.next) {
  15. yield walker.value;
  16. }
  17. }
  18. removeNode(node) {
  19. if (node.list !== this) {
  20. throw new Error('removing node which does not belong to this list');
  21. }
  22. const next = node.next;
  23. const prev = node.prev;
  24. if (next) {
  25. next.prev = prev;
  26. }
  27. if (prev) {
  28. prev.next = next;
  29. }
  30. if (node === this.head) {
  31. this.head = next;
  32. }
  33. if (node === this.tail) {
  34. this.tail = prev;
  35. }
  36. this.length--;
  37. node.next = undefined;
  38. node.prev = undefined;
  39. node.list = undefined;
  40. return next;
  41. }
  42. unshiftNode(node) {
  43. if (node === this.head) {
  44. return;
  45. }
  46. if (node.list) {
  47. node.list.removeNode(node);
  48. }
  49. const head = this.head;
  50. node.list = this;
  51. node.next = head;
  52. if (head) {
  53. head.prev = node;
  54. }
  55. this.head = node;
  56. if (!this.tail) {
  57. this.tail = node;
  58. }
  59. this.length++;
  60. }
  61. pushNode(node) {
  62. if (node === this.tail) {
  63. return;
  64. }
  65. if (node.list) {
  66. node.list.removeNode(node);
  67. }
  68. const tail = this.tail;
  69. node.list = this;
  70. node.prev = tail;
  71. if (tail) {
  72. tail.next = node;
  73. }
  74. this.tail = node;
  75. if (!this.head) {
  76. this.head = node;
  77. }
  78. this.length++;
  79. }
  80. push(...args) {
  81. for (let i = 0, l = args.length; i < l; i++) {
  82. push(this, args[i]);
  83. }
  84. return this.length;
  85. }
  86. unshift(...args) {
  87. for (var i = 0, l = args.length; i < l; i++) {
  88. unshift(this, args[i]);
  89. }
  90. return this.length;
  91. }
  92. pop() {
  93. if (!this.tail) {
  94. return undefined;
  95. }
  96. const res = this.tail.value;
  97. const t = this.tail;
  98. this.tail = this.tail.prev;
  99. if (this.tail) {
  100. this.tail.next = undefined;
  101. }
  102. else {
  103. this.head = undefined;
  104. }
  105. t.list = undefined;
  106. this.length--;
  107. return res;
  108. }
  109. shift() {
  110. if (!this.head) {
  111. return undefined;
  112. }
  113. const res = this.head.value;
  114. const h = this.head;
  115. this.head = this.head.next;
  116. if (this.head) {
  117. this.head.prev = undefined;
  118. }
  119. else {
  120. this.tail = undefined;
  121. }
  122. h.list = undefined;
  123. this.length--;
  124. return res;
  125. }
  126. forEach(fn, thisp) {
  127. thisp = thisp || this;
  128. for (let walker = this.head, i = 0; !!walker; i++) {
  129. fn.call(thisp, walker.value, i, this);
  130. walker = walker.next;
  131. }
  132. }
  133. forEachReverse(fn, thisp) {
  134. thisp = thisp || this;
  135. for (let walker = this.tail, i = this.length - 1; !!walker; i--) {
  136. fn.call(thisp, walker.value, i, this);
  137. walker = walker.prev;
  138. }
  139. }
  140. get(n) {
  141. let i = 0;
  142. let walker = this.head;
  143. for (; !!walker && i < n; i++) {
  144. walker = walker.next;
  145. }
  146. if (i === n && !!walker) {
  147. return walker.value;
  148. }
  149. }
  150. getReverse(n) {
  151. let i = 0;
  152. let walker = this.tail;
  153. for (; !!walker && i < n; i++) {
  154. // abort out of the list early if we hit a cycle
  155. walker = walker.prev;
  156. }
  157. if (i === n && !!walker) {
  158. return walker.value;
  159. }
  160. }
  161. map(fn, thisp) {
  162. thisp = thisp || this;
  163. const res = new Yallist();
  164. for (let walker = this.head; !!walker;) {
  165. res.push(fn.call(thisp, walker.value, this));
  166. walker = walker.next;
  167. }
  168. return res;
  169. }
  170. mapReverse(fn, thisp) {
  171. thisp = thisp || this;
  172. var res = new Yallist();
  173. for (let walker = this.tail; !!walker;) {
  174. res.push(fn.call(thisp, walker.value, this));
  175. walker = walker.prev;
  176. }
  177. return res;
  178. }
  179. reduce(fn, initial) {
  180. let acc;
  181. let walker = this.head;
  182. if (arguments.length > 1) {
  183. acc = initial;
  184. }
  185. else if (this.head) {
  186. walker = this.head.next;
  187. acc = this.head.value;
  188. }
  189. else {
  190. throw new TypeError('Reduce of empty list with no initial value');
  191. }
  192. for (var i = 0; !!walker; i++) {
  193. acc = fn(acc, walker.value, i);
  194. walker = walker.next;
  195. }
  196. return acc;
  197. }
  198. reduceReverse(fn, initial) {
  199. let acc;
  200. let walker = this.tail;
  201. if (arguments.length > 1) {
  202. acc = initial;
  203. }
  204. else if (this.tail) {
  205. walker = this.tail.prev;
  206. acc = this.tail.value;
  207. }
  208. else {
  209. throw new TypeError('Reduce of empty list with no initial value');
  210. }
  211. for (let i = this.length - 1; !!walker; i--) {
  212. acc = fn(acc, walker.value, i);
  213. walker = walker.prev;
  214. }
  215. return acc;
  216. }
  217. toArray() {
  218. const arr = new Array(this.length);
  219. for (let i = 0, walker = this.head; !!walker; i++) {
  220. arr[i] = walker.value;
  221. walker = walker.next;
  222. }
  223. return arr;
  224. }
  225. toArrayReverse() {
  226. const arr = new Array(this.length);
  227. for (let i = 0, walker = this.tail; !!walker; i++) {
  228. arr[i] = walker.value;
  229. walker = walker.prev;
  230. }
  231. return arr;
  232. }
  233. slice(from = 0, to = this.length) {
  234. if (to < 0) {
  235. to += this.length;
  236. }
  237. if (from < 0) {
  238. from += this.length;
  239. }
  240. const ret = new Yallist();
  241. if (to < from || to < 0) {
  242. return ret;
  243. }
  244. if (from < 0) {
  245. from = 0;
  246. }
  247. if (to > this.length) {
  248. to = this.length;
  249. }
  250. let walker = this.head;
  251. let i = 0;
  252. for (i = 0; !!walker && i < from; i++) {
  253. walker = walker.next;
  254. }
  255. for (; !!walker && i < to; i++, walker = walker.next) {
  256. ret.push(walker.value);
  257. }
  258. return ret;
  259. }
  260. sliceReverse(from = 0, to = this.length) {
  261. if (to < 0) {
  262. to += this.length;
  263. }
  264. if (from < 0) {
  265. from += this.length;
  266. }
  267. const ret = new Yallist();
  268. if (to < from || to < 0) {
  269. return ret;
  270. }
  271. if (from < 0) {
  272. from = 0;
  273. }
  274. if (to > this.length) {
  275. to = this.length;
  276. }
  277. let i = this.length;
  278. let walker = this.tail;
  279. for (; !!walker && i > to; i--) {
  280. walker = walker.prev;
  281. }
  282. for (; !!walker && i > from; i--, walker = walker.prev) {
  283. ret.push(walker.value);
  284. }
  285. return ret;
  286. }
  287. splice(start, deleteCount = 0, ...nodes) {
  288. if (start > this.length) {
  289. start = this.length - 1;
  290. }
  291. if (start < 0) {
  292. start = this.length + start;
  293. }
  294. let walker = this.head;
  295. for (let i = 0; !!walker && i < start; i++) {
  296. walker = walker.next;
  297. }
  298. const ret = [];
  299. for (let i = 0; !!walker && i < deleteCount; i++) {
  300. ret.push(walker.value);
  301. walker = this.removeNode(walker);
  302. }
  303. if (!walker) {
  304. walker = this.tail;
  305. }
  306. else if (walker !== this.tail) {
  307. walker = walker.prev;
  308. }
  309. for (const v of nodes) {
  310. walker = insertAfter(this, walker, v);
  311. }
  312. return ret;
  313. }
  314. reverse() {
  315. const head = this.head;
  316. const tail = this.tail;
  317. for (let walker = head; !!walker; walker = walker.prev) {
  318. const p = walker.prev;
  319. walker.prev = walker.next;
  320. walker.next = p;
  321. }
  322. this.head = tail;
  323. this.tail = head;
  324. return this;
  325. }
  326. }
  327. // insertAfter undefined means "make the node the new head of list"
  328. function insertAfter(self, node, value) {
  329. const prev = node;
  330. const next = node ? node.next : self.head;
  331. const inserted = new Node(value, prev, next, self);
  332. if (inserted.next === undefined) {
  333. self.tail = inserted;
  334. }
  335. if (inserted.prev === undefined) {
  336. self.head = inserted;
  337. }
  338. self.length++;
  339. return inserted;
  340. }
  341. function push(self, item) {
  342. self.tail = new Node(item, self.tail, undefined, self);
  343. if (!self.head) {
  344. self.head = self.tail;
  345. }
  346. self.length++;
  347. }
  348. function unshift(self, item) {
  349. self.head = new Node(item, undefined, self.head, self);
  350. if (!self.tail) {
  351. self.tail = self.head;
  352. }
  353. self.length++;
  354. }
  355. export class Node {
  356. list;
  357. next;
  358. prev;
  359. value;
  360. constructor(value, prev, next, list) {
  361. this.list = list;
  362. this.value = value;
  363. if (prev) {
  364. prev.next = this;
  365. this.prev = prev;
  366. }
  367. else {
  368. this.prev = undefined;
  369. }
  370. if (next) {
  371. next.prev = this;
  372. this.next = next;
  373. }
  374. else {
  375. this.next = undefined;
  376. }
  377. }
  378. }
  379. //# sourceMappingURL=index.js.map