Jurassic

A .NET library to parse and execute JavaScript code.

Code Quality Rank: L1

Programming language: C#

License: MIT License

Tags: Misc     JavaScript     ECMAScript    

Latest version: v3.0.0

README

What is Jurassic?

Jurassic is an implementation of the ECMAScript language and runtime. It aims to provide the best performing and most standards-compliant implementation of JavaScript for .NET. Jurassic is not intended for end-users; instead it is intended to be integrated into .NET programs. If you are the author of a .NET program, you can use Jurassic to compile and execute JavaScript code.

Features

• Supports all ECMAScript 3 and ECMAScript 5 functionality, including ES5 strict mode
• Well tested - passes over five thousand unit tests (with over thirty thousand asserts)
• Simple yet powerful API
• Compiles JavaScript into .NET bytecode (CIL); not an interpreter
• Deployed as a single .NET assembly (no native code)
• Basic support for integrated debugging within Visual Studio
• Uses light-weight code generation, so generated code is fully garbage collected
• Tested on .NET 3.5, .NET 4 and Silverlight

How do I get it?

Install the NuGet package.

Usage

See the wiki for full usage details.

ECMAScript 6 status

Support for ECMAScript 6 is in progress. See http://kangax.github.io/compat-table/es6/ for the definition of each feature. The table below is correct as of version 3.1.

Feature	Status
Optimisation
proper tail calls (tail call optimisation)	:x:
Syntax
default function parameters	4/7
rest parameters	:x:
spread syntax for iterable objects	:x:
object literal extensions	:white_check_mark: 6/6
for..of loops	6/9
octal and binary literals	:white_check_mark: 4/4
template literals	6/7
RegExp "y" and "u" flags	:x:
destructuring, declarations	:x:
destructuring, assignment	:x:
destructuring, parameters	:x:
Unicode code point escapes	:white_check_mark: 4/4
new.target	:white_check_mark: 2/2
Bindings
const	:white_check_mark: 18/18
let	14/16
block-level function declaration[18]	:x:
Functions
arrow functions	:x:
class	:white_check_mark: 24/24
super	:white_check_mark: 8/8
generators	:x:
Built-ins
typed arrays	45/46
Map	18/19
Set	18/19
WeakMap	11/12
WeakSet	10/11
Proxy [25]	33/34
Reflect [26]	18/20
Promise	4/8
Symbol	:white_check_mark: 12/12
well-known symbols[27]	23/26
Built-in extensions
Object static methods	:white_check_mark: 4/4
function "name" property	10/17
String static methods	:white_check_mark: 2/2
String.prototype methods	:white_check_mark: 10/10
RegExp.prototype properties	:white_check_mark: 6/6
Array static methods	8/11
Array.prototype methods	:white_check_mark: 10/10
Number properties	:white_check_mark: 9/9
Math methods	:white_check_mark: 17/17
Date.prototype[Symbol.toPrimitive]	:white_check_mark: 1/1
Subclassing
Array is subclassable	9/11
RegExp is subclassable	:white_check_mark: 4/4
Function is subclassable	4/6
Promise is subclassable	:x:
miscellaneous subclassables	:x:
Misc
prototype of bound functions	1/5
Proxy, internal 'get' calls	19/36
Proxy, internal 'set' calls	7/11
Proxy, internal 'defineProperty' calls	:x:
Proxy, internal 'deleteProperty' calls	:x:
Proxy, internal 'getOwnPropertyDescriptor' calls	2/4
Proxy, internal 'ownKeys' calls	:white_check_mark: 3/3
Object static methods accept primitives	:white_check_mark: 10/10
own property order	5/7
Updated identifier syntax	1/3
miscellaneous	8/9
Annex b
non-strict function semantics[35]	2/3
__proto__ in object literals [36]	:x:
Object.prototype.__proto__	1/6
String.prototype HTML methods	:white_check_mark: 3/3
RegExp.prototype.compile	1/2
RegExp syntax extensions	4/8
HTML-style comments	:x: