58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
/*
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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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var createInnerCallback = require("./createInnerCallback");
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function startsWith(string, searchString) {
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var stringLength = string.length;
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var 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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var 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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function AliasPlugin(source, options, target) {
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this.source = source;
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this.name = options.name;
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this.alias = options.alias;
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this.onlyModule = options.onlyModule;
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this.target = target;
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}
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module.exports = AliasPlugin;
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AliasPlugin.prototype.apply = function(resolver) {
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var target = this.target;
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var name = this.name;
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var alias = this.alias;
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var onlyModule = this.onlyModule;
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resolver.plugin(this.source, function(request, callback) {
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var innerRequest = request.request;
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if(!innerRequest) return callback();
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if(innerRequest === name || (!onlyModule && startsWith(innerRequest, name + "/"))) {
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if(innerRequest !== alias && !startsWith(innerRequest, alias + "/")) {
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var newRequestStr = alias + innerRequest.substr(name.length);
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var 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 '" + name + "': '" + alias + "' to '" + newRequestStr + "'", createInnerCallback(function(err, result) {
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if(arguments.length > 0) return callback(err, result);
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// don't allow other aliasing or raw request
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callback(null, null);
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}, callback));
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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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