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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const DescriptionFileUtils = require("./DescriptionFileUtils");
const getInnerRequest = require("./getInnerRequest");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").JsonPrimitive} JsonPrimitive */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
// Sentinel stored in `_fieldDataCache` when a description file does not
// contain a usable alias field object. Lets us distinguish "not cached yet"
// from "no valid field" without calling back into `getField`.
const NO_FIELD_OBJECT = Symbol("NoFieldObject");
module.exports = class AliasFieldPlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {string | string[]} field field
* @param {string | ResolveStepHook} target target
*/
constructor(source, field, target) {
this.source = source;
this.field = field;
this.target = target;
// `this.field` is fixed for the plugin's lifetime, so caching
// per description-file content is safe. The cached value is either
// the resolved alias-map object or the `NO_FIELD_OBJECT` sentinel
// meaning "description file has no usable alias field".
/** @type {WeakMap<import("./Resolver").JsonObject, { [k: string]: JsonPrimitive } | typeof NO_FIELD_OBJECT>} */
this._fieldDataCache = new WeakMap();
}
/**
* @param {Resolver} resolver the resolver
* @returns {void}
*/
apply(resolver) {
const target = resolver.ensureHook(this.target);
resolver
.getHook(this.source)
.tapAsync("AliasFieldPlugin", (request, resolveContext, callback) => {
if (!request.descriptionFileData) return callback();
const innerRequest = getInnerRequest(resolver, request);
if (!innerRequest) return callback();
const { descriptionFileData } = request;
let fieldData = this._fieldDataCache.get(descriptionFileData);
if (fieldData === undefined) {
const raw = DescriptionFileUtils.getField(
descriptionFileData,
this.field,
);
fieldData =
raw === null || typeof raw !== "object"
? NO_FIELD_OBJECT
: /** @type {{ [k: string]: JsonPrimitive }} */ (raw);
this._fieldDataCache.set(descriptionFileData, fieldData);
}
if (fieldData === NO_FIELD_OBJECT) {
if (resolveContext.log) {
resolveContext.log(
`Field '${this.field}' doesn't contain a valid alias configuration`,
);
}
return callback();
}
/** @type {JsonPrimitive | undefined} */
const data = Object.prototype.hasOwnProperty.call(
fieldData,
innerRequest,
)
? /** @type {{ [Key in string]: JsonPrimitive }} */ (fieldData)[
innerRequest
]
: innerRequest.startsWith("./")
? /** @type {{ [Key in string]: JsonPrimitive }} */ (fieldData)[
innerRequest.slice(2)
]
: undefined;
if (data === innerRequest) return callback();
if (data === undefined) return callback();
if (data === false) {
/** @type {ResolveRequest} */
const ignoreObj = {
...request,
path: false,
};
if (typeof resolveContext.yield === "function") {
resolveContext.yield(ignoreObj);
return callback(null, null);
}
return callback(null, ignoreObj);
}
/** @type {ResolveRequest} */
const obj = {
...request,
path: /** @type {string} */ (request.descriptionFileRoot),
request: /** @type {string} */ (data),
fullySpecified: false,
};
resolver.doResolve(
target,
obj,
`aliased from description file ${
request.descriptionFilePath
} with mapping '${innerRequest}' to '${/** @type {string} */ data}'`,
resolveContext,
(err, result) => {
if (err) return callback(err);
// Don't allow other aliasing or raw request
if (result === undefined) return callback(null, null);
callback(null, result);
},
);
});
}
};