优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
"use strict";
 
function startsWith(string, searchString) {
    const stringLength = string.length;
    const searchLength = searchString.length;
 
    // early out if the search length is greater than the search string
    if (searchLength > stringLength) {
        return false;
    }
    let index = -1;
    while (++index < searchLength) {
        if (string.charCodeAt(index) !== searchString.charCodeAt(index)) {
            return false;
        }
    }
    return true;
}
 
module.exports = class AliasPlugin {
    constructor(source, options, target) {
        this.source = source;
        this.options = Array.isArray(options) ? options : [options];
        this.target = target;
    }
 
    apply(resolver) {
        const target = resolver.ensureHook(this.target);
        resolver
            .getHook(this.source)
            .tapAsync("AliasPlugin", (request, resolveContext, callback) => {
                const innerRequest = request.request || request.path;
                if (!innerRequest) return callback();
                for (const item of this.options) {
                    if (
                        innerRequest === item.name ||
                        (!item.onlyModule && startsWith(innerRequest, item.name + "/"))
                    ) {
                        if (
                            innerRequest !== item.alias &&
                            !startsWith(innerRequest, item.alias + "/")
                        ) {
                            const newRequestStr =
                                item.alias + innerRequest.substr(item.name.length);
                            const obj = Object.assign({}, request, {
                                request: newRequestStr
                            });
                            return resolver.doResolve(
                                target,
                                obj,
                                "aliased with mapping '" +
                                    item.name +
                                    "': '" +
                                    item.alias +
                                    "' to '" +
                                    newRequestStr +
                                    "'",
                                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);
                                }
                            );
                        }
                    }
                }
                return callback();
            });
    }
};