114 lines
3.3 KiB
JavaScript
114 lines
3.3 KiB
JavaScript
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'use strict';
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var inspect = require('object-inspect');
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var $TypeError = require('es-errors/type');
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/*
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* This function traverses the list returning the node corresponding to the given key.
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*
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* That node is also moved to the head of the list, so that if it's accessed again we don't need to traverse the whole list.
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* By doing so, all the recently used nodes can be accessed relatively quickly.
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*/
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/** @type {import('./list.d.ts').listGetNode} */
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// eslint-disable-next-line consistent-return
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var listGetNode = function (list, key, isDelete) {
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/** @type {typeof list | NonNullable<(typeof list)['next']>} */
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var prev = list;
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/** @type {(typeof list)['next']} */
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var curr;
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// eslint-disable-next-line eqeqeq
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for (; (curr = prev.next) != null; prev = curr) {
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if (curr.key === key) {
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prev.next = curr.next;
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if (!isDelete) {
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// eslint-disable-next-line no-extra-parens
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curr.next = /** @type {NonNullable<typeof list.next>} */ (list.next);
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list.next = curr; // eslint-disable-line no-param-reassign
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}
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return curr;
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}
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}
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};
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/** @type {import('./list.d.ts').listGet} */
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var listGet = function (objects, key) {
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if (!objects) {
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return void undefined;
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}
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var node = listGetNode(objects, key);
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return node && node.value;
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};
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/** @type {import('./list.d.ts').listSet} */
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var listSet = function (objects, key, value) {
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var node = listGetNode(objects, key);
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if (node) {
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node.value = value;
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} else {
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// Prepend the new node to the beginning of the list
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objects.next = /** @type {import('./list.d.ts').ListNode<typeof value, typeof key>} */ ({ // eslint-disable-line no-param-reassign, no-extra-parens
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key: key,
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next: objects.next,
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value: value
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});
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}
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};
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/** @type {import('./list.d.ts').listHas} */
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var listHas = function (objects, key) {
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if (!objects) {
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return false;
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}
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return !!listGetNode(objects, key);
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};
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/** @type {import('./list.d.ts').listDelete} */
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// eslint-disable-next-line consistent-return
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var listDelete = function (objects, key) {
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if (objects) {
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return listGetNode(objects, key, true);
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}
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};
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/** @type {import('.')} */
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module.exports = function getSideChannelList() {
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/** @typedef {ReturnType<typeof getSideChannelList>} Channel */
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/** @typedef {Parameters<Channel['get']>[0]} K */
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/** @typedef {Parameters<Channel['set']>[1]} V */
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/** @type {import('./list.d.ts').RootNode<V, K> | undefined} */ var $o;
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/** @type {Channel} */
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var channel = {
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assert: function (key) {
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if (!channel.has(key)) {
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throw new $TypeError('Side channel does not contain ' + inspect(key));
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}
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},
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'delete': function (key) {
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var root = $o && $o.next;
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var deletedNode = listDelete($o, key);
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if (deletedNode && root && root === deletedNode) {
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$o = void undefined;
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}
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return !!deletedNode;
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},
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get: function (key) {
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return listGet($o, key);
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},
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has: function (key) {
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return listHas($o, key);
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},
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set: function (key, value) {
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if (!$o) {
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// Initialize the linked list as an empty node, so that we don't have to special-case handling of the first node: we can always refer to it as (previous node).next, instead of something like (list).head
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$o = {
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next: void undefined
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};
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}
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// eslint-disable-next-line no-extra-parens
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listSet(/** @type {NonNullable<typeof $o>} */ ($o), key, value);
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}
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};
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// @ts-expect-error TODO: figure out why this is erroring
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return channel;
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};
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