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bootstrap.js
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bootstrap.js
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#!/usr/bin/env node
'use strict';
const Module = require('module');
const path = require('path');
const util = require('util');
const fs = require('fs');
// Require the JavaScript parser
const espree = require(path.join(__dirname, 'node_modules', 'espree'));
const node_require = Module.prototype.require;
const node_resolve = require.resolve;
const node_cache = require.cache;
// Store in the module prototype the original functions for future use in derived loaders like TypeScript
Module.prototype.node_require = node_require;
Module.prototype.node_resolve = node_resolve;
Module.prototype.node_cache = node_cache;
function node_loader_trampoline_initialize(loader_library_path) {
// Restore the argv (this is used for tricking node::Start method)
process.argv = [ process.argv[0] ];
// Add current execution directory to the execution paths
node_loader_trampoline_execution_path(process.cwd());
const paths = [
// Local version of MetaCall NodeJS Port
'metacall',
// Optionally, use loader library path for global installed NodeJS Port
...loader_library_path ? [ path.join(loader_library_path, 'node_modules', 'metacall', 'index.js') ] : [],
];
for (const r of paths) {
try {
return node_require(r);
} catch (e) {
if (e.code !== 'MODULE_NOT_FOUND') {
console.log(`NodeJS Error (while preloading MetaCall): ${e.message}`);
}
}
}
// console.log('NodeJS Warning: MetaCall could not be preloaded');
}
function node_loader_trampoline_is_callable(value) {
return typeof value === 'function';
}
function node_loader_trampoline_is_valid_symbol(node) {
// TODO: Enable more function types
return node.type === 'FunctionDeclaration'
|| node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression';
}
function node_loader_trampoline_module(m) {
if (node_loader_trampoline_is_callable(m)) {
const wrapper = {};
wrapper[m.name] = m;
return wrapper;
}
return m;
};
function node_loader_trampoline_node_path() {
// Retrieve NODE_PATH enviroment variable and convert it to array of strings
return (process.env['NODE_PATH'] || '').split(path.delimiter).filter((e) => e.length !== 0);
}
function node_loader_trampoline_execution_path_push_unique(paths, p) {
// Check if the path exists in its cannonical form (/a/b and /a/b/ are the same path)
if (!paths.some(cur => path.relative(cur, p) === '')) {
// Insert execution path
paths.push(p);
return true;
}
return false;
}
function node_loader_trampoline_execution_path(p) {
if (p) {
const paths = node_loader_trampoline_node_path();
// Insert first the execution path as it is
let moduleRefresh = node_loader_trampoline_execution_path_push_unique(paths, p);
// Each added execution path will follow the NodeJS module style
const modulePaths = Module._nodeModulePaths(p);
for (const modulePath of modulePaths) {
moduleRefresh = moduleRefresh || node_loader_trampoline_execution_path_push_unique(paths, modulePath);
}
if (moduleRefresh) {
// Set the NODE_PATH environment variable again
process.env['NODE_PATH'] = paths.join(path.delimiter);
// Refresh the paths and make effective the changes
Module._initPaths();
}
}
}
function node_loader_trampoline_import(method, p) {
try {
return method(p);
} catch (ex) {
if (ex.code !== 'MODULE_NOT_FOUND') {
throw ex;
}
// Try global paths
const paths = node_loader_trampoline_node_path();
for (const r of paths) {
try {
return method(path.join(r, p));
} catch (e) {
if (e.code !== 'MODULE_NOT_FOUND') {
throw e;
}
}
}
throw ex;
}
}
function node_loader_trampoline_load_from_file(paths) {
if (!Array.isArray(paths)) {
throw new Error('Load from file paths must be an array, not ' + typeof paths);
}
try {
const handle = {};
for (let i = 0; i < paths.length; ++i) {
const p = paths[i];
const m = node_loader_trampoline_import(node_require, p);
handle[p] = node_loader_trampoline_module(m);
}
return handle;
} catch (ex) {
console.log('Exception in node_loader_trampoline_load_from_file while loading:', paths, ex);
}
return null;
}
function node_loader_trampoline_load_from_memory(name, buffer, opts) {
if (typeof name !== 'string') {
throw new Error('Load from memory name must be a string, not ' + typeof name);
}
if (typeof buffer !== 'string') {
throw new Error('Load from memory buffer must be a string, not ' + typeof buffer);
}
if (typeof opts !== 'object') {
throw new Error('Load from memory opts must be an object, not ' + typeof opts);
}
const paths = Module._nodeModulePaths(path.dirname(name));
const parent = module.parent;
const m = new Module(name, parent);
m.filename = name;
m.paths = [
...opts.prepend_paths || [],
...paths,
...opts.append_paths || [],
];
try {
// eslint-disable-next-line no-underscore-dangle
m._compile(buffer, name);
} catch (ex) {
console.log('Exception in node_loader_trampoline_load_from_memory while loading:', buffer, ex);
return null;
}
if (parent && parent.children) {
parent.children.splice(parent.children.indexOf(m), 1);
}
const handle = {};
handle[name] = node_loader_trampoline_module(m.exports);
return handle;
}
// eslint-disable-next-line no-empty-function
function node_loader_trampoline_load_from_package() {
// TODO
}
function node_loader_trampoline_clear(handle) {
try {
const names = Object.getOwnPropertyNames(handle);
for (let i = 0; i < names.length; ++i) {
const p = names[i];
try {
const absolute = node_loader_trampoline_import(node_resolve, p);
if (node_cache[absolute]) {
delete node_cache[absolute];
}
} catch (_) {}
}
} catch (ex) {
console.log('Exception in node_loader_trampoline_clear', ex);
}
}
function node_loader_trampoline_discover_arguments_generate(args, index) {
let name = `_arg${index}`;
while (args.includes(name)) {
name = `_${name}`;
}
return name;
}
function node_loader_trampoline_discover_arguments(node) {
const params = node.params;
const args = [];
for (let i = 0; i < params.length; ++i) {
const p = params[i];
if (p.type === 'Identifier') {
args.push(p.name);
} else if (p.type === 'AssignmentPattern' && p.left && p.left.type === 'Identifier') {
args.push(p.left.name);
} else if (p.type === 'ObjectPattern') {
// TODO: Use this trick until meta object protocol
args.push(null);
}
}
// TODO: Use this trick until meta object protocol
for (let i = 0; i < params.length; ++i) {
const p = args[i];
if (p === null) {
args[i] = node_loader_trampoline_discover_arguments_generate(args, i);
}
}
return args;
}
function node_loader_trampoline_discover_function(func) {
try {
if (node_loader_trampoline_is_callable(func)) {
// Espree can't parse native code functions so we can do a workaround
const str = func.toString().replace('{ [native code] }', '{}');
const ast = (() => {
try {
// Parse the function
return espree.parse(`(${str})`, {
ecmaVersion: 14
});
} catch (e) {
// Espree can't parse a function exported directly from a map without key, like:
// const exports = { myfunc() {} };
// Because it lacks from function prefix, so as a workaround, we add function prefix
// if it does not exist. It is a nasty trick but it's the best solution I found by now.
return espree.parse(`(function ${str})`, {
ecmaVersion: 14
});
}
})();
const node = (ast.body[0].type === 'ExpressionStatement') ?
ast.body[0].expression : ast.body[0];
if (node_loader_trampoline_is_valid_symbol(node)) {
const args = node_loader_trampoline_discover_arguments(node);
const discover = {
ptr: func,
signature: args,
async: node.async,
};
if (node.id && node.id.name) {
discover['name'] = node.id.name;
}
return discover;
}
}
} catch (ex) {
console.log(`Exception while parsing '${func}' in node_loader_trampoline_discover_function`, ex);
}
}
function node_loader_trampoline_discover(handle) {
const discover = {};
try {
const names = Object.getOwnPropertyNames(handle);
for (let i = 0; i < names.length; ++i) {
const exports = handle[names[i]];
const keys = Object.getOwnPropertyNames(exports);
for (let j = 0; j < keys.length; ++j) {
const key = keys[j];
const func = exports[key];
const descriptor = node_loader_trampoline_discover_function(func);
if (descriptor !== undefined) {
discover[key] = descriptor;
}
}
}
} catch (ex) {
console.log('Exception in node_loader_trampoline_discover', ex);
}
return discover;
}
function node_loader_trampoline_test(obj) {
// Imporant: never trigger an async resource in this function
if (obj !== undefined) {
fs.writeSync(process.stdout.fd, `${util.inspect(obj, false, null, true)}\n`);
}
}
function node_loader_trampoline_await_function(trampoline) {
if (!trampoline) {
return function node_loader_trampoline_await_impl(func, args, trampoline_ptr) {
console.error('NodeJS Loader await error, trampoline could not be found, await calls are disabled.');
};
}
return function node_loader_trampoline_await_impl(func, args, trampoline_ptr) {
if (typeof func !== 'function') {
throw new Error('Await only accepts a callable function func, not ' + typeof func);
}
if (!Array.isArray(args)) {
throw new Error('Await only accepts a array as arguments args, not ' + typeof args);
}
if (typeof trampoline_ptr !== 'object') {
throw new Error('Await trampoline_ptr must be an object, not ' + typeof trampoline_ptr);
}
try {
return Promise.resolve(func(...args)).then(
x => trampoline.resolve(trampoline_ptr, x),
x => trampoline.reject(trampoline_ptr, x),
);
} catch (err) {
try {
return trampoline.reject(trampoline_ptr, err);
} catch (fatal) {
return Promise.reject(fatal);
}
}
};
}
function node_loader_trampoline_await_future(trampoline) {
if (!trampoline) {
return function node_loader_trampoline_await_impl(func, args, trampoline_ptr) {
console.error('NodeJS Loader await error, trampoline could not be found, await calls are disabled.');
};
}
return function node_loader_trampoline_await_impl(future, trampoline_ptr) {
if (!(!!future && typeof future.then === 'function')) {
throw new Error('Await only accepts a thenable promise, not ' + typeof future);
}
if (typeof trampoline_ptr !== 'object') {
throw new Error('Await trampoline_ptr must be an object, not ' + typeof trampoline_ptr);
}
try {
return Promise.resolve(future).then(
x => trampoline.resolve(trampoline_ptr, x),
x => trampoline.reject(trampoline_ptr, x),
);
} catch (err) {
try {
return trampoline.reject(trampoline_ptr, err);
} catch (fatal) {
return Promise.reject(fatal);
}
}
};
}
module.exports = ((impl, ptr) => {
try {
if (typeof impl === 'undefined' || typeof ptr === 'undefined') {
throw new Error('Process arguments (process.argv[2], process.argv[3]) not defined.');
}
// Get trampoline from list of linked bindings
const trampoline = process._linkedBinding('node_loader_trampoline_module');
const node_loader_ptr = trampoline.register(impl, ptr, {
'initialize': node_loader_trampoline_initialize,
'execution_path': node_loader_trampoline_execution_path,
'load_from_file': node_loader_trampoline_load_from_file,
'load_from_memory': node_loader_trampoline_load_from_memory,
'load_from_package': node_loader_trampoline_load_from_package,
'clear': node_loader_trampoline_clear,
'discover': node_loader_trampoline_discover,
'discover_function': node_loader_trampoline_discover_function,
'test': node_loader_trampoline_test,
'await_function': node_loader_trampoline_await_function(trampoline),
'await_future': node_loader_trampoline_await_future(trampoline),
});
} catch (ex) {
console.log('Exception in bootstrap.js trampoline initialization:', ex);
}
})(process.argv[2], process.argv[3]);