aaac7fed
 liuqimichale
add
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var createInnerCallback = require("./createInnerCallback");
function startsWith(string, searchString) {
var stringLength = string.length;
var searchLength = searchString.length;
// early out if the search length is greater than the search string
if(searchLength > stringLength) {
return false;
}
var index = -1;
while(++index < searchLength) {
if(string.charCodeAt(index) !== searchString.charCodeAt(index)) {
return false;
}
}
return true;
}
function AliasPlugin(source, options, target) {
this.source = source;
this.name = options.name;
this.alias = options.alias;
this.onlyModule = options.onlyModule;
this.target = target;
}
module.exports = AliasPlugin;
AliasPlugin.prototype.apply = function(resolver) {
var target = this.target;
var name = this.name;
var alias = this.alias;
var onlyModule = this.onlyModule;
resolver.plugin(this.source, function(request, callback) {
var innerRequest = request.request;
if(!innerRequest) return callback();
if(innerRequest === name || (!onlyModule && startsWith(innerRequest, name + "/"))) {
if(innerRequest !== alias && !startsWith(innerRequest, alias + "/")) {
var newRequestStr = alias + innerRequest.substr(name.length);
var obj = Object.assign({}, request, {
request: newRequestStr
});
return resolver.doResolve(target, obj, "aliased with mapping '" + name + "': '" + alias + "' to '" + newRequestStr + "'", createInnerCallback(function(err, result) {
if(arguments.length > 0) return callback(err, result);
// don't allow other aliasing or raw request
callback(null, null);
}, callback));
}
}
return callback();
});
};
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