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store.js
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store.js
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'use strict';
const debug = require('debug')('yeoman:environment:store');
/**
* The Generator store
* This is used to store generator (npm packages) reference and instantiate them when
* requested.
* @constructor
* @private
*/
class Store {
constructor() {
this._generators = {};
this._meta = {};
// Store packages paths by ns
this._packagesPaths = {};
// Store packages ns
this._packagesNS = [];
}
/**
* Store a module under the namespace key
* @param {String} namespace - The key under which the generator can be retrieved
* @param {String|Function} generator - A generator module or a module path
* @param {String} packagePath - PackagePath to the generator npm package (optional)
* @param {String} [resolved] - The file path to the generator (used only if generator is a module)
*/
add(namespace, generator, resolved, packagePath) {
if (typeof generator === 'string') {
this._storeAsPath(namespace, generator, packagePath);
return;
}
this._storeAsModule(namespace, generator, resolved, packagePath);
}
_storeAsPath(namespace, path, packagePath) {
this._meta[namespace] = {
resolved: path,
namespace,
packagePath
};
Object.defineProperty(this._generators, namespace, {
get() {
const Generator = require(path);
return Generator;
},
enumerable: true,
configurable: true
});
}
_storeAsModule(namespace, Generator, resolved, packagePath) {
this._meta[namespace] = {
resolved,
namespace,
packagePath
};
this._generators[namespace] = Generator;
}
/**
* Get the module registered under the given namespace
* @param {String} namespace
* @return {Module}
*/
get(namespace) {
const Generator = this._generators[namespace];
if (!Generator) {
return;
}
return Object.assign(Generator, this._meta[namespace]);
}
/**
* Returns the list of registered namespace.
* @return {Array} Namespaces array
*/
namespaces() {
return Object.keys(this._generators);
}
/**
* Get the stored generators meta data
* @return {Object} Generators metadata
*/
getGeneratorsMeta() {
return this._meta;
}
/**
* Store a package under the namespace key
* @param {String} packageNS - The key under which the generator can be retrieved
* @param {String} packagePath - The package path
*/
addPackage(packageNS, packagePath) {
if (this._packagesPaths[packageNS]) {
// Yo environment allows overriding, so the last added has preference.
if (this._packagesPaths[packageNS][0] !== packagePath) {
const packagePaths = this._packagesPaths[packageNS];
debug('Overriding a package with namespace %s and path %s, with path %s',
packageNS, this._packagesPaths[packageNS][0], packagePath);
// Remove old packagePath
const index = packagePaths.indexOf(packagePath);
if (index > -1) {
packagePaths.splice(index, 1);
}
packagePaths.splice(0, 0, packagePath);
}
} else {
this._packagesPaths[packageNS] = [packagePath];
}
}
/**
* Get the stored packages namespaces with paths.
* @return {Object} Stored packages namespaces with paths.
*/
getPackagesPaths() {
return this._packagesPaths;
}
/**
* Store a package ns
* @param {String} packageNS - The key under which the generator can be retrieved
*/
addPackageNS(packageNS) {
if (!this._packagesNS.includes(packageNS)) {
this._packagesNS.push(packageNS);
}
}
/**
* Get the stored packages namespaces.
* @return {Array} Stored packages namespaces.
*/
getPackagesNS() {
return this._packagesNS;
}
}
module.exports = Store;