| /* |
| 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(); |
| }); |
| } |
| }; |