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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const DescriptionFileUtils = require("./DescriptionFileUtils");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
const slashCode = "/".charCodeAt(0);
module.exports = class SelfReferencePlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {string | string[]} fieldNamePath name path
* @param {string | ResolveStepHook} target target
*/
constructor(source, fieldNamePath, target) {
this.source = source;
this.target = target;
this.fieldName = fieldNamePath;
}
/**
* @param {Resolver} resolver the resolver
* @returns {void}
*/
apply(resolver) {
const target = resolver.ensureHook(this.target);
resolver
.getHook(this.source)
.tapAsync("SelfReferencePlugin", (request, resolveContext, callback) => {
if (!request.descriptionFilePath) return callback();
const req = request.request;
if (!req) return callback();
// Feature is only enabled when an exports field is present
const exportsField = DescriptionFileUtils.getField(
request.descriptionFileData,
this.fieldName
);
if (!exportsField) return callback();
const name = DescriptionFileUtils.getField(
request.descriptionFileData,
"name"
);
if (typeof name !== "string") return callback();
if (
req.startsWith(name) &&
(req.length === name.length ||
req.charCodeAt(name.length) === slashCode)
) {
const remainingRequest = `.${req.slice(name.length)}`;
const obj = {
...request,
request: remainingRequest,
path: /** @type {string} */ (request.descriptionFileRoot),
relativePath: "."
};
resolver.doResolve(
target,
obj,
"self reference",
resolveContext,
callback
);
} else {
return callback();
}
});
}
};
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