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/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
"use strict";
/**
* @template T, K, C
* @typedef {import("./SerializerMiddleware")<T, K, C>} SerializerMiddleware
*/
/**
* @template DeserializedValue
* @template SerializedValue
* @template Context
*/
class Serializer {
/**
* @param {SerializerMiddleware<EXPECTED_ANY, EXPECTED_ANY, EXPECTED_ANY>[]} middlewares serializer middlewares
* @param {Context=} context context
*/
constructor(middlewares, context) {
this.serializeMiddlewares = middlewares.slice();
this.deserializeMiddlewares = middlewares.slice().reverse();
this.context = context;
}
/**
* @template ExtendedContext
* @param {DeserializedValue | Promise<DeserializedValue>} obj object
* @param {Context & ExtendedContext} context context object
* @returns {Promise<SerializedValue>} result
*/
serialize(obj, context) {
const ctx = { ...context, ...this.context };
let current = obj;
for (const middleware of this.serializeMiddlewares) {
if (
current &&
typeof (/** @type {Promise<DeserializedValue>} */ (current).then) ===
"function"
) {
current =
/** @type {Promise<DeserializedValue>} */
(current).then(data => data && middleware.serialize(data, ctx));
} else if (current) {
try {
current = middleware.serialize(current, ctx);
} catch (err) {
current = Promise.reject(err);
}
} else break;
}
return /** @type {Promise<SerializedValue>} */ (current);
}
/**
* @template ExtendedContext
* @param {SerializedValue | Promise<SerializedValue>} value value
* @param {Context & ExtendedContext} context object
* @returns {Promise<DeserializedValue>} result
*/
deserialize(value, context) {
const ctx = { ...context, ...this.context };
let current = value;
for (const middleware of this.deserializeMiddlewares) {
current =
current &&
typeof (/** @type {Promise<SerializedValue>} */ (current).then) ===
"function"
? /** @type {Promise<SerializedValue>} */ (current).then(data =>
middleware.deserialize(data, ctx)
)
: middleware.deserialize(current, ctx);
}
return /** @type {Promise<DeserializedValue>} */ (current);
}
}
module.exports = Serializer;