jurassic
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A .NET library to parse and execute JavaScript code.
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: |