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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const path = require("path");
module.exports = class MainFieldPlugin {
constructor(source, options, target) {
this.source = source;
this.options = options;
this.target = target;
}
apply(resolver) {
const target = resolver.ensureHook(this.target);
resolver.getHook(this.source).tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
if(request.path !== request.descriptionFileRoot) return callback();
if(request.alreadyTriedMainField === request.descriptionFilePath) return callback();
const content = request.descriptionFileData;
const filename = path.basename(request.descriptionFilePath);
let mainModule;
const field = this.options.name;
if(Array.isArray(field)) {
let current = content;
for(let j = 0; j < field.length; j++) {
if(current === null || typeof current !== "object") {
current = null;
break;
}
current = current[field[j]];
}
if(typeof current === "string") {
mainModule = current;
}
} else {
if(typeof content[field] === "string") {
mainModule = content[field];
}
}
if(!mainModule) return callback();
if(this.options.forceRelative && !/^\.\.?\//.test(mainModule))
mainModule = "./" + mainModule;
const obj = Object.assign({}, request, {
request: mainModule,
alreadyTriedMainField: request.descriptionFilePath
});
return resolver.doResolve(target, obj, "use " + mainModule + " from " + this.options.name + " in " + filename, resolveContext, callback);
});
}
};
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