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export class Resolver {
constructor(factory) {
this.factory = factory;
}
resolveWith(container) {
if (this.isConstructor()) {
return this.resolveDependenciesUsing(container);
}
else {
return this.factory(container);
}
}
parseConstructor(func) {
let code = func.toString();
let regex = /function ([a-zA-Z]*)\((.*)\) *\{/;
return code.match(regex);
}
isConstructor() {
return this.parseConstructor(this.factory)[1] != '';
}
resolveDependenciesUsing(container) {
let ctor = this.parseConstructor(this.factory);
console.log(`Building: ${ctor[1]}`);
let parameters = ctor.slice(2)[0].split(',').filter(Boolean);
let dependencies = parameters.map((parameter) => {
return container.resolve(parameter.trim());
});
return new this.factory(...dependencies);
}
}
export class Registration {
constructor(factory) {
this.factory = factory;
}
create(container) {
return new Resolver(this.factory).resolveWith(container);
}
asSingleton() {
let originalFactory = this.factory;
let item = null;
this.factory = (container) => {
if (item == null) {
item = new Resolver(originalFactory).resolveWith(container);
}
return item;
};
}
}
export default class Registry {
constructor() {
this.registrations = {};
}
register(key, factory) {
if (this.registrations[key] == undefined) {
this.registrations[key] = [];
}
let registration = new Registration(factory);
this.registrations[key].push(registration);
return registration;
}
isRegistered(key) {
return this.registrations.hasOwnProperty(key);
}
resolve(key) {
if (!this.isRegistered(key)) {
throw `"${key}" is not registered`;
}
try {
let registration = this.registrations[key][0];
return registration.create(this);
} catch(error) {
console.error(`ERROR: Could not resolve "${key}" ${error}`);
console.log("REGISTERED:");
console.log(this.registrations);
throw error;
}
}
resolveAll(key) {
return this.registrations[key].map(registration => registration.create(this));
}
}
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