var semver = require("semver"); var vm = require("vm"); var setupContext = new vm.Script([ "[ Array, Boolean, Error, Function, Number, Object, RegExp, String ].forEach(function(f) {", " f.toString = Function.prototype.toString;", "});", "Function.prototype.toString = function() {", " var id = 100000;", " return function() {", " var n = this.name;", " if (!/^F[0-9]{6}N$/.test(n)) {", ' n = "F" + ++id + "N";', ].concat(Object.getOwnPropertyDescriptor(Function.prototype, "name").configurable ? [ ' Object.defineProperty(this, "name", {', " get: function() {", " return n;", " }", " });", ] : [], [ " }", ' return "function(){}";', " };", "}();", "this;", ]).join("\n")); function createContext() { var ctx = vm.createContext(Object.defineProperty({}, "console", { value: { log: log } })); var global = setupContext.runInContext(ctx); return ctx; function safe_log(arg, level) { if (arg) switch (typeof arg) { case "function": return arg.toString(); case "object": if (arg === global) return "[object global]"; if (/Error$/.test(arg.name)) return arg.toString(); arg.constructor.toString(); if (level--) for (var key in arg) { var desc = Object.getOwnPropertyDescriptor(arg, key); if (!desc || !desc.get) arg[key] = safe_log(arg[key], level); } } return arg; } function log(msg) { if (arguments.length == 1 && typeof msg == "string") return console.log("%s", msg); return console.log.apply(console, [].map.call(arguments, function(arg) { return safe_log(arg, 3); })); } } exports.run_code = function(code, toplevel, timeout) { timeout = timeout || 5000; var stdout = ""; var original_write = process.stdout.write; process.stdout.write = function(chunk) { stdout += chunk; }; try { vm.runInContext(toplevel ? "(function(){" + code + "})()" : code, createContext(), { timeout: timeout }); return stdout; } catch (ex) { return ex; } finally { process.stdout.write = original_write; } }; function strip_func_ids(text) { return ("" + text).replace(/F[0-9]{6}N/g, "N>"); } exports.same_stdout = semver.satisfies(process.version, "0.12") ? function(expected, actual) { if (typeof expected != typeof actual) return false; if (typeof expected == "object" && typeof expected.name == "string" && typeof expected.message == "string") { if (expected.name !== actual.name) return false; if (typeof actual.message != "string") return false; expected = expected.message.slice(expected.message.lastIndexOf("\n") + 1); actual = actual.message.slice(actual.message.lastIndexOf("\n") + 1); } return strip_func_ids(expected) == strip_func_ids(actual); } : function(expected, actual) { return typeof expected == typeof actual && strip_func_ids(expected) == strip_func_ids(actual); }; exports.has_toplevel = function(options) { return options.toplevel || options.mangle && options.mangle.toplevel || options.compress && options.compress.toplevel; }; John Darrington