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'use strict';
const { URL } = require('url');
const { getURLFromFilePath } = require('internal/url');
const {
getNamespaceOfModuleWrap
} = require('internal/loader/ModuleWrap');
const ModuleMap = require('internal/loader/ModuleMap');
const ModuleJob = require('internal/loader/ModuleJob');
const resolveRequestUrl = require('internal/loader/resolveRequestUrl');
const errors = require('internal/errors');
function getBase() {
try {
return getURLFromFilePath(`${process.cwd()}/`);
} catch (e) {
e.stack;
// If the current working directory no longer exists.
if (e.code === 'ENOENT') {
return undefined;
}
throw e;
}
}
class Loader {
constructor(base = getBase()) {
this.moduleMap = new ModuleMap();
if (typeof base !== 'undefined' && base instanceof URL !== true) {
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'base', 'URL');
}
this.base = base;
}
async resolve(specifier) {
const request = resolveRequestUrl(this.base, specifier);
if (request.url.protocol !== 'file:') {
throw new errors.Error('ERR_INVALID_PROTOCOL',
request.url.protocol, 'file:');
}
return request.url;
}
async getModuleJob(dependentJob, specifier) {
if (!this.moduleMap.has(dependentJob.url)) {
throw new errors.Error('ERR_MISSING_MODULE', dependentJob.url);
}
const request = await resolveRequestUrl(dependentJob.url, specifier);
const url = `${request.url}`;
if (this.moduleMap.has(url)) {
return this.moduleMap.get(url);
}
const dependencyJob = new ModuleJob(this, request);
this.moduleMap.set(url, dependencyJob);
return dependencyJob;
}
async import(specifier) {
const request = await resolveRequestUrl(this.base, specifier);
const url = `${request.url}`;
let job;
if (this.moduleMap.has(url)) {
job = this.moduleMap.get(url);
} else {
job = new ModuleJob(this, request);
this.moduleMap.set(url, job);
}
const module = await job.run();
return getNamespaceOfModuleWrap(module);
}
}
Object.setPrototypeOf(Loader.prototype, null);
module.exports = Loader;
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