init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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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").JsonObject} JsonObject */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @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(
                    /** @type {JsonObject} */ (request.descriptionFileData),
                    this.fieldName
                );
                if (!exportsField) return callback();
 
                const name = DescriptionFileUtils.getField(
                    /** @type {JsonObject} */ (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)}`;
                    /** @type {ResolveRequest} */
                    const obj = {
                        ...request,
                        request: remainingRequest,
                        path: /** @type {string} */ (request.descriptionFileRoot),
                        relativePath: "."
                    };
 
                    resolver.doResolve(
                        target,
                        obj,
                        "self reference",
                        resolveContext,
                        callback
                    );
                } else {
                    return callback();
                }
            });
    }
};