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StatsFactory.js
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Wed, Feb 5, 19:08

StatsFactory.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { HookMap, SyncBailHook, SyncWaterfallHook } = require("tapable");
const { concatComparators, keepOriginalOrder } = require("../util/comparators");
const smartGrouping = require("../util/smartGrouping");
/** @typedef {import("../util/smartGrouping").GroupConfig<any, object>} GroupConfig */
class StatsFactory {
constructor() {
this.hooks = Object.freeze({
/** @type {HookMap<SyncBailHook<[Object, any, Object]>>} */
extract: new HookMap(
() => new SyncBailHook(["object", "data", "context"])
),
/** @type {HookMap<SyncBailHook<[any, Object, number, number]>>} */
filter: new HookMap(
() => new SyncBailHook(["item", "context", "index", "unfilteredIndex"])
),
/** @type {HookMap<SyncBailHook<[(function(any, any): number)[], Object]>>} */
sort: new HookMap(() => new SyncBailHook(["comparators", "context"])),
/** @type {HookMap<SyncBailHook<[any, Object, number, number]>>} */
filterSorted: new HookMap(
() => new SyncBailHook(["item", "context", "index", "unfilteredIndex"])
),
/** @type {HookMap<SyncBailHook<[GroupConfig[], Object]>>} */
groupResults: new HookMap(
() => new SyncBailHook(["groupConfigs", "context"])
),
/** @type {HookMap<SyncBailHook<[(function(any, any): number)[], Object]>>} */
sortResults: new HookMap(
() => new SyncBailHook(["comparators", "context"])
),
filterResults: new HookMap(
() => new SyncBailHook(["item", "context", "index", "unfilteredIndex"])
),
/** @type {HookMap<SyncBailHook<[any[], Object]>>} */
merge: new HookMap(() => new SyncBailHook(["items", "context"])),
/** @type {HookMap<SyncBailHook<[any[], Object]>>} */
result: new HookMap(() => new SyncWaterfallHook(["result", "context"])),
/** @type {HookMap<SyncBailHook<[any, Object]>>} */
getItemName: new HookMap(() => new SyncBailHook(["item", "context"])),
/** @type {HookMap<SyncBailHook<[any, Object]>>} */
getItemFactory: new HookMap(() => new SyncBailHook(["item", "context"]))
});
const hooks = this.hooks;
this._caches = /** @type {Record<keyof typeof hooks, Map<string, SyncBailHook<[any[], Object]>[]>>} */ ({});
for (const key of Object.keys(hooks)) {
this._caches[key] = new Map();
}
this._inCreate = false;
}
_getAllLevelHooks(hookMap, cache, type) {
const cacheEntry = cache.get(type);
if (cacheEntry !== undefined) {
return cacheEntry;
}
const hooks = [];
const typeParts = type.split(".");
for (let i = 0; i < typeParts.length; i++) {
const hook = hookMap.get(typeParts.slice(i).join("."));
if (hook) {
hooks.push(hook);
}
}
cache.set(type, hooks);
return hooks;
}
_forEachLevel(hookMap, cache, type, fn) {
for (const hook of this._getAllLevelHooks(hookMap, cache, type)) {
const result = fn(hook);
if (result !== undefined) return result;
}
}
_forEachLevelWaterfall(hookMap, cache, type, data, fn) {
for (const hook of this._getAllLevelHooks(hookMap, cache, type)) {
data = fn(hook, data);
}
return data;
}
_forEachLevelFilter(hookMap, cache, type, items, fn, forceClone) {
const hooks = this._getAllLevelHooks(hookMap, cache, type);
if (hooks.length === 0) return forceClone ? items.slice() : items;
let i = 0;
return items.filter((item, idx) => {
for (const hook of hooks) {
const r = fn(hook, item, idx, i);
if (r !== undefined) {
if (r) i++;
return r;
}
}
i++;
return true;
});
}
create(type, data, baseContext) {
if (this._inCreate) {
return this._create(type, data, baseContext);
} else {
try {
this._inCreate = true;
return this._create(type, data, baseContext);
} finally {
for (const key of Object.keys(this._caches)) this._caches[key].clear();
this._inCreate = false;
}
}
}
_create(type, data, baseContext) {
const context = {
...baseContext,
type,
[type]: data
};
if (Array.isArray(data)) {
// run filter on unsorted items
const items = this._forEachLevelFilter(
this.hooks.filter,
this._caches.filter,
type,
data,
(h, r, idx, i) => h.call(r, context, idx, i),
true
);
// sort items
const comparators = [];
this._forEachLevel(this.hooks.sort, this._caches.sort, type, h =>
h.call(comparators, context)
);
if (comparators.length > 0) {
items.sort(
// @ts-expect-error number of arguments is correct
concatComparators(...comparators, keepOriginalOrder(items))
);
}
// run filter on sorted items
const items2 = this._forEachLevelFilter(
this.hooks.filterSorted,
this._caches.filterSorted,
type,
items,
(h, r, idx, i) => h.call(r, context, idx, i),
false
);
// for each item
let resultItems = items2.map((item, i) => {
const itemContext = {
...context,
_index: i
};
// run getItemName
const itemName = this._forEachLevel(
this.hooks.getItemName,
this._caches.getItemName,
`${type}[]`,
h => h.call(item, itemContext)
);
if (itemName) itemContext[itemName] = item;
const innerType = itemName ? `${type}[].${itemName}` : `${type}[]`;
// run getItemFactory
const itemFactory =
this._forEachLevel(
this.hooks.getItemFactory,
this._caches.getItemFactory,
innerType,
h => h.call(item, itemContext)
) || this;
// run item factory
return itemFactory.create(innerType, item, itemContext);
});
// sort result items
const comparators2 = [];
this._forEachLevel(
this.hooks.sortResults,
this._caches.sortResults,
type,
h => h.call(comparators2, context)
);
if (comparators2.length > 0) {
resultItems.sort(
// @ts-expect-error number of arguments is correct
concatComparators(...comparators2, keepOriginalOrder(resultItems))
);
}
// group result items
const groupConfigs = [];
this._forEachLevel(
this.hooks.groupResults,
this._caches.groupResults,
type,
h => h.call(groupConfigs, context)
);
if (groupConfigs.length > 0) {
resultItems = smartGrouping(resultItems, groupConfigs);
}
// run filter on sorted result items
const finalResultItems = this._forEachLevelFilter(
this.hooks.filterResults,
this._caches.filterResults,
type,
resultItems,
(h, r, idx, i) => h.call(r, context, idx, i),
false
);
// run merge on mapped items
let result = this._forEachLevel(
this.hooks.merge,
this._caches.merge,
type,
h => h.call(finalResultItems, context)
);
if (result === undefined) result = finalResultItems;
// run result on merged items
return this._forEachLevelWaterfall(
this.hooks.result,
this._caches.result,
type,
result,
(h, r) => h.call(r, context)
);
} else {
const object = {};
// run extract on value
this._forEachLevel(this.hooks.extract, this._caches.extract, type, h =>
h.call(object, data, context)
);
// run result on extracted object
return this._forEachLevelWaterfall(
this.hooks.result,
this._caches.result,
type,
object,
(h, r) => h.call(r, context)
);
}
}
}
module.exports = StatsFactory;

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