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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();
});
}
};
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