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'use strict';
/* global WebAssembly */
const {
JSONParse,
ObjectKeys,
SafeMap,
StringPrototypeReplace,
} = primordials;
const { Buffer } = require('buffer');
const {
stripBOM,
loadNativeModule
} = require('internal/modules/cjs/helpers');
const CJSModule = require('internal/modules/cjs/loader').Module;
const internalURLModule = require('internal/url');
const createDynamicModule = require(
'internal/modules/esm/create_dynamic_module');
const fs = require('fs');
const { fileURLToPath, URL } = require('url');
const { debuglog } = require('internal/util/debuglog');
const { promisify } = require('internal/util');
const {
ERR_INVALID_URL,
ERR_INVALID_URL_SCHEME,
ERR_UNKNOWN_BUILTIN_MODULE
} = require('internal/errors').codes;
const readFileAsync = promisify(fs.readFile);
const { maybeCacheSourceMap } = require('internal/source_map/source_map_cache');
const moduleWrap = internalBinding('module_wrap');
const { ModuleWrap } = moduleWrap;
const debug = debuglog('esm');
const translators = new SafeMap();
exports.translators = translators;
const DATA_URL_PATTERN = /^[^/]+\/[^,;]+(?:[^,]*?)(;base64)?,([\s\S]*)$/;
function getSource(url) {
const parsed = new URL(url);
if (parsed.protocol === 'file:') {
return readFileAsync(parsed);
} else if (parsed.protocol === 'data:') {
const match = DATA_URL_PATTERN.exec(parsed.pathname);
if (!match) {
throw new ERR_INVALID_URL(url);
}
const [ , base64, body ] = match;
return Buffer.from(body, base64 ? 'base64' : 'utf8');
} else {
throw new ERR_INVALID_URL_SCHEME(['file', 'data']);
}
}
function errPath(url) {
const parsed = new URL(url);
if (parsed.protocol === 'file:') {
return fileURLToPath(parsed);
}
return url;
}
function initializeImportMeta(meta, { url }) {
meta.url = url;
}
let esmLoader;
async function importModuleDynamically(specifier, { url }) {
if (!esmLoader) {
esmLoader = require('internal/process/esm_loader');
}
return esmLoader.ESMLoader.import(specifier, url);
}
// Strategy for loading a standard JavaScript module
translators.set('module', async function moduleStrategy(url) {
const source = `${await getSource(url)}`;
maybeCacheSourceMap(url, source);
debug(`Translating StandardModule ${url}`);
const module = new ModuleWrap(url, undefined, source, 0, 0);
moduleWrap.callbackMap.set(module, {
initializeImportMeta,
importModuleDynamically,
});
return module;
});
// Strategy for loading a node-style CommonJS module
const isWindows = process.platform === 'win32';
const winSepRegEx = /\//g;
translators.set('commonjs', function commonjsStrategy(url, isMain) {
debug(`Translating CJSModule ${url}`);
const pathname = internalURLModule.fileURLToPath(new URL(url));
const cached = this.cjsCache.get(url);
if (cached) {
this.cjsCache.delete(url);
return cached;
}
const module = CJSModule._cache[
isWindows ? StringPrototypeReplace(pathname, winSepRegEx, '\\') : pathname
];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
return new ModuleWrap(url, undefined, ['default'], function() {
debug(`Loading CJSModule ${url}`);
// We don't care about the return val of _load here because Module#load
// will handle it for us by checking the loader registry and filling the
// exports like above
CJSModule._load(pathname, undefined, isMain);
});
});
// Strategy for loading a node builtin CommonJS module that isn't
// through normal resolution
translators.set('builtin', async function builtinStrategy(url) {
debug(`Translating BuiltinModule ${url}`);
// Slice 'node:' scheme
const id = url.slice(5);
const module = loadNativeModule(id, url, true);
if (!module) {
throw new ERR_UNKNOWN_BUILTIN_MODULE(id);
}
debug(`Loading BuiltinModule ${url}`);
return module.getESMFacade();
});
// Strategy for loading a JSON file
translators.set('json', async function jsonStrategy(url) {
debug(`Translating JSONModule ${url}`);
debug(`Loading JSONModule ${url}`);
const pathname = url.startsWith('file:') ? fileURLToPath(url) : null;
let modulePath;
let module;
if (pathname) {
modulePath = isWindows ?
StringPrototypeReplace(pathname, winSepRegEx, '\\') : pathname;
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
}
const content = `${await getSource(url)}`;
if (pathname) {
// A require call could have been called on the same file during loading and
// that resolves synchronously. To make sure we always return the identical
// export, we have to check again if the module already exists or not.
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
}
try {
const exports = JSONParse(stripBOM(content));
module = {
exports,
loaded: true
};
} catch (err) {
// TODO (BridgeAR): We could add a NodeCore error that wraps the JSON
// parse error instead of just manipulating the original error message.
// That would allow to add further properties and maybe additional
// debugging information.
err.message = errPath(url) + ': ' + err.message;
throw err;
}
if (pathname) {
CJSModule._cache[modulePath] = module;
}
return new ModuleWrap(url, undefined, ['default'], function() {
debug(`Parsing JSONModule ${url}`);
this.setExport('default', module.exports);
});
});
// Strategy for loading a wasm module
translators.set('wasm', async function(url) {
const buffer = await getSource(url);
debug(`Translating WASMModule ${url}`);
let compiled;
try {
compiled = await WebAssembly.compile(buffer);
} catch (err) {
err.message = errPath(url) + ': ' + err.message;
throw err;
}
const imports =
WebAssembly.Module.imports(compiled).map(({ module }) => module);
const exports = WebAssembly.Module.exports(compiled).map(({ name }) => name);
return createDynamicModule(imports, exports, url, (reflect) => {
const { exports } = new WebAssembly.Instance(compiled, reflect.imports);
for (const expt of ObjectKeys(exports))
reflect.exports[expt].set(exports[expt]);
}).module;
});
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