| /* |
| MIT License http://www.opensource.org/licenses/mit-license.php |
| Author Tobias Koppers @sokra |
| */ |
| "use strict"; |
| |
| const DescriptionFileUtils = require("./DescriptionFileUtils"); |
| const getInnerRequest = require("./getInnerRequest"); |
| |
| module.exports = class AliasFieldPlugin { |
| constructor(source, field, target) { |
| this.source = source; |
| this.field = field; |
| this.target = target; |
| } |
| |
| apply(resolver) { |
| const target = resolver.ensureHook(this.target); |
| resolver |
| .getHook(this.source) |
| .tapAsync("AliasFieldPlugin", (request, resolveContext, callback) => { |
| if (!request.descriptionFileData) return callback(); |
| const innerRequest = getInnerRequest(resolver, request); |
| if (!innerRequest) return callback(); |
| const fieldData = DescriptionFileUtils.getField( |
| request.descriptionFileData, |
| this.field |
| ); |
| if (typeof fieldData !== "object") { |
| if (resolveContext.log) |
| resolveContext.log( |
| "Field '" + |
| this.field + |
| "' doesn't contain a valid alias configuration" |
| ); |
| return callback(); |
| } |
| const data1 = fieldData[innerRequest]; |
| const data2 = fieldData[innerRequest.replace(/^\.\//, "")]; |
| const data = typeof data1 !== "undefined" ? data1 : data2; |
| if (data === innerRequest) return callback(); |
| if (data === undefined) return callback(); |
| if (data === false) { |
| const ignoreObj = Object.assign({}, request, { |
| path: false |
| }); |
| return callback(null, ignoreObj); |
| } |
| const obj = Object.assign({}, request, { |
| path: request.descriptionFileRoot, |
| request: data |
| }); |
| resolver.doResolve( |
| target, |
| obj, |
| "aliased from description file " + |
| request.descriptionFilePath + |
| " with mapping '" + |
| innerRequest + |
| "' to '" + |
| data + |
| "'", |
| 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); |
| } |
| ); |
| }); |
| } |
| }; |