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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Module = require("./Module");
const OriginalSource = require("webpack-sources").OriginalSource;
const RawSource = require("webpack-sources").RawSource;
const WebpackMissingModule = require("./dependencies/WebpackMissingModule");
const Template = require("./Template");
class ExternalModule extends Module {
constructor(request, type, userRequest) {
super();
this.request = request;
this.userRequest = userRequest;
this.type = type;
this.built = false;
this.external = true;
}
libIdent() {
return this.userRequest;
}
chunkCondition(chunk) {
return chunk.hasEntryModule();
}
identifier() {
return "external " + JSON.stringify(this.request);
}
readableIdentifier() {
return "external " + JSON.stringify(this.request);
}
needRebuild() {
return false;
}
build(options, compilation, resolver, fs, callback) {
this.builtTime = Date.now();
callback();
}
getSourceForGlobalVariableExternal(variableName, type) {
if(!Array.isArray(variableName)) {
// make it an array as the look up works the same basically
variableName = [variableName];
}
// needed for e.g. window["some"]["thing"]
const objectLookup = variableName.map(r => `[${JSON.stringify(r)}]`).join("");
return `(function() { module.exports = ${type}${objectLookup}; }());`;
}
getSourceForCommonJsExternal(moduleAndSpecifiers) {
if(!Array.isArray(moduleAndSpecifiers)) {
return `module.exports = require(${JSON.stringify(moduleAndSpecifiers)});`;
}
const moduleName = moduleAndSpecifiers[0];
const objectLookup = moduleAndSpecifiers.slice(1).map(r => `[${JSON.stringify(r)}]`).join("");
return `module.exports = require(${moduleName})${objectLookup};`;
}
checkExternalVariable(variableToCheck, request) {
return `if(typeof ${variableToCheck} === 'undefined') {${WebpackMissingModule.moduleCode(request)}}\n`;
}
getSourceForAmdOrUmdExternal(id, optional, request) {
const externalVariable = Template.toIdentifier(`__WEBPACK_EXTERNAL_MODULE_${id}__`);
const missingModuleError = optional ? this.checkExternalVariable(externalVariable, request) : "";
return `${missingModuleError}module.exports = ${externalVariable};`;
}
getSourceForDefaultCase(optional, request) {
const missingModuleError = optional ? this.checkExternalVariable(request, request) : "";
return `${missingModuleError}module.exports = ${request};`;
}
getSourceString() {
const request = typeof this.request === "object" ? this.request[this.type] : this.request;
switch(this.type) {
case "this":
case "window":
case "global":
return this.getSourceForGlobalVariableExternal(request, this.type);
case "commonjs":
case "commonjs2":
return this.getSourceForCommonJsExternal(request);
case "amd":
case "umd":
case "umd2":
return this.getSourceForAmdOrUmdExternal(this.id, this.optional, request);
default:
return this.getSourceForDefaultCase(this.optional, request);
}
}
getSource(sourceString) {
if(this.useSourceMap) {
return new OriginalSource(sourceString, this.identifier());
}
return new RawSource(sourceString);
}
source() {
return this.getSource(
this.getSourceString()
);
}
size() {
return 42;
}
updateHash(hash) {
hash.update(this.type);
hash.update(JSON.stringify(this.request));
hash.update(JSON.stringify(Boolean(this.optional)));
super.updateHash(hash);
}
}
module.exports = ExternalModule;
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