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MIT License http://www.opensource.org/licenses/mit-license.php

Author Tobias Koppers @sokra

"use strict";

const ExternalModule = require("./ExternalModule");

class ExternalModuleFactoryPlugin {

constructor(type, externals) {

this.type = type;

this.externals = externals;

}

apply(normalModuleFactory) {

const globalType = this.type;

normalModuleFactory.plugin("factory", factory => (data, callback) => {

const context = data.context;

const dependency = data.dependencies[0];

function handleExternal(value, type, callback) {

if(typeof type === "function") {

callback = type;

type = undefined;

}

if(value === false) return factory(data, callback);

if(value === true) value = dependency.request;

if(typeof type === "undefined" && /^[a-z0-9]+ /.test(value)) {

const idx = value.indexOf(" ");

type = value.substr(0, idx);

value = value.substr(idx + 1);

}

callback(null, new ExternalModule(value, type || globalType, dependency.request));

return true;

}

(function handleExternals(externals, callback) {

if(typeof externals === "string") {

if(externals === dependency.request) {

return handleExternal(dependency.request, callback);

}

} else if(Array.isArray(externals)) {

let i = 0;

(function next() {

let asyncFlag;

const handleExternalsAndCallback = function handleExternalsAndCallback(err, module) {

if(err) return callback(err);

if(!module) {

if(asyncFlag) {

asyncFlag = false;

return;

}

return next();

}

callback(null, module);

};

do {

asyncFlag = true;

if(i >= externals.length) return callback();

handleExternals(externals[i++], handleExternalsAndCallback);

} while (!asyncFlag); // eslint-disable-line keyword-spacing

asyncFlag = false;

}());

return;

} else if(externals instanceof RegExp) {

if(externals.test(dependency.request)) {

return handleExternal(dependency.request, callback);

}

} else if(typeof externals === "function") {

externals.call(null, context, dependency.request, function(err, value, type) {

if(err) return callback(err);

if(typeof value !== "undefined") {

handleExternal(value, type, callback);

} else {

callback();

}

});

return;

} else if(typeof externals === "object" && Object.prototype.hasOwnProperty.call(externals, dependency.request)) {

return handleExternal(externals[dependency.request], callback);

}

callback();

}(this.externals, function(err, module) {

if(err) return callback(err);

if(!module) return handleExternal(false, callback);

return callback(null, module);

}));

});

}

module.exports = ExternalModuleFactoryPlugin;

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