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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.hooks.factory.tap(
"ExternalModuleFactoryPlugin",
factory => (data, callback) => {
const context = data.context;
const dependency = data.dependencies[0];
const 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 (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;
};
const handleExternals = (externals, callback) => {
if (typeof externals === "string") {
if (externals === dependency.request) {
return handleExternal(dependency.request, callback);
}
} else if (Array.isArray(externals)) {
let i = 0;
const next = () => {
let asyncFlag;
const 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);
asyncFlag = false;
};
next();
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,
(err, value, type) => {
if (err) return callback(err);
if (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();
};
handleExternals(this.externals, (err, module) => {
if (err) return callback(err);
if (!module) return handleExternal(false, callback);
return callback(null, module);
});
}
);
}
}
module.exports = ExternalModuleFactoryPlugin;