57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
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/*
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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.getHook(this.source).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(innerRequest === item.name || (!item.onlyModule && startsWith(innerRequest, item.name + "/"))) {
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if(innerRequest !== item.alias && !startsWith(innerRequest, item.alias + "/")) {
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const newRequestStr = 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(target, obj, "aliased with mapping '" + item.name + "': '" + item.alias + "' to '" + newRequestStr + "'", resolveContext, (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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return callback();
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});
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}
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};
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