/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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function startsWith(string, searchString) {
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const stringLength = string.length;
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const searchLength = searchString.length;
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// early out if the search length is greater than the search string
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if (searchLength > stringLength) {
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return false;
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}
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let index = -1;
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while (++index < searchLength) {
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if (string.charCodeAt(index) !== searchString.charCodeAt(index)) {
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return false;
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}
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}
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return true;
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}
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module.exports = class AliasPlugin {
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constructor(source, options, target) {
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this.source = source;
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this.options = Array.isArray(options) ? options : [options];
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this.target = target;
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}
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apply(resolver) {
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const target = resolver.ensureHook(this.target);
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resolver
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.getHook(this.source)
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.tapAsync("AliasPlugin", (request, resolveContext, callback) => {
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const innerRequest = request.request || request.path;
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if (!innerRequest) return callback();
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for (const item of this.options) {
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if (
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innerRequest === item.name ||
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(!item.onlyModule && startsWith(innerRequest, item.name + "/"))
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) {
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if (
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innerRequest !== item.alias &&
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!startsWith(innerRequest, item.alias + "/")
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) {
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const newRequestStr =
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item.alias + innerRequest.substr(item.name.length);
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const obj = Object.assign({}, request, {
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request: newRequestStr
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});
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return resolver.doResolve(
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target,
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obj,
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"aliased with mapping '" +
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item.name +
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"': '" +
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item.alias +
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"' to '" +
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newRequestStr +
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"'",
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resolveContext,
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(err, result) => {
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if (err) return callback(err);
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// Don't allow other aliasing or raw request
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if (result === undefined) return callback(null, null);
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callback(null, result);
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}
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);
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}
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}
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}
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return callback();
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});
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}
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};
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