You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
2.7 KiB
118 lines
2.7 KiB
4 weeks ago
|
/*
|
||
|
|
MIT License http://www.opensource.org/licenses/mit-license.php
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
/** @typedef {import("./ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
|
||
|
|
/** @typedef {import("./ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
|
||
|
|
|
||
|
|
/** @typedef {(arg0?: any) => void} CacheAssoc */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @template T
|
||
|
|
* @typedef {WeakMap<CacheAssoc, ObjectStructure<T>>}
|
||
|
|
*/
|
||
|
|
const cache = new WeakMap();
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @template T
|
||
|
|
*/
|
||
|
|
class ObjectStructure {
|
||
|
|
constructor() {
|
||
|
|
this.keys = undefined;
|
||
|
|
this.children = undefined;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {keyof T[]} keys keys
|
||
|
|
* @returns {keyof T[]} keys
|
||
|
|
*/
|
||
|
|
getKeys(keys) {
|
||
|
|
if (this.keys === undefined) this.keys = keys;
|
||
|
|
return this.keys;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {keyof T} key key
|
||
|
|
* @returns {ObjectStructure<T>} object structure
|
||
|
|
*/
|
||
|
|
key(key) {
|
||
|
|
if (this.children === undefined) this.children = new Map();
|
||
|
|
const child = this.children.get(key);
|
||
|
|
if (child !== undefined) return child;
|
||
|
|
const newChild = new ObjectStructure();
|
||
|
|
this.children.set(key, newChild);
|
||
|
|
return newChild;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @template T
|
||
|
|
* @param {(keyof T)[]} keys keys
|
||
|
|
* @param {CacheAssoc} cacheAssoc cache assoc fn
|
||
|
|
* @returns {(keyof T)[]} keys
|
||
|
|
*/
|
||
|
|
const getCachedKeys = (keys, cacheAssoc) => {
|
||
|
|
let root = cache.get(cacheAssoc);
|
||
|
|
if (root === undefined) {
|
||
|
|
root = new ObjectStructure();
|
||
|
|
cache.set(cacheAssoc, root);
|
||
|
|
}
|
||
|
|
let current = root;
|
||
|
|
for (const key of keys) {
|
||
|
|
current = current.key(key);
|
||
|
|
}
|
||
|
|
return current.getKeys(keys);
|
||
|
|
};
|
||
|
|
|
||
|
|
class PlainObjectSerializer {
|
||
|
|
/**
|
||
|
|
* @template {object} T
|
||
|
|
* @param {T} obj plain object
|
||
|
|
* @param {ObjectSerializerContext} context context
|
||
|
|
*/
|
||
|
|
serialize(obj, context) {
|
||
|
|
const keys = /** @type {(keyof T)[]} */ (Object.keys(obj));
|
||
|
|
if (keys.length > 128) {
|
||
|
|
// Objects with so many keys are unlikely to share structure
|
||
|
|
// with other objects
|
||
|
|
context.write(keys);
|
||
|
|
for (const key of keys) {
|
||
|
|
context.write(obj[key]);
|
||
|
|
}
|
||
|
|
} else if (keys.length > 1) {
|
||
|
|
context.write(getCachedKeys(keys, context.write));
|
||
|
|
for (const key of keys) {
|
||
|
|
context.write(obj[key]);
|
||
|
|
}
|
||
|
|
} else if (keys.length === 1) {
|
||
|
|
const key = keys[0];
|
||
|
|
context.write(key);
|
||
|
|
context.write(obj[key]);
|
||
|
|
} else {
|
||
|
|
context.write(null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @template {object} T
|
||
|
|
* @param {ObjectDeserializerContext} context context
|
||
|
|
* @returns {T} plain object
|
||
|
|
*/
|
||
|
|
deserialize(context) {
|
||
|
|
const keys = context.read();
|
||
|
|
const obj = /** @type {T} */ ({});
|
||
|
|
if (Array.isArray(keys)) {
|
||
|
|
for (const key of keys) {
|
||
|
|
obj[/** @type {keyof T} */ (key)] = context.read();
|
||
|
|
}
|
||
|
|
} else if (keys !== null) {
|
||
|
|
obj[/** @type {keyof T} */ (keys)] = context.read();
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = PlainObjectSerializer;
|