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Ecma262-jison is an ECMAScript parser written in js/jison. Try to build a ECMAScript parser in practice.

Home Page: https://w-y.github.io/ecma262-jison/site/index.html

License: MIT License

JavaScript 100.00%

ecmascript ecma jison javascript es2016

ecma262-jison's Introduction

ECMA262-JISON

用js的Lex/Yacc工具来实现和扩展ECMAScript规范，学习ECMAScript规范并尝试打造一个parser。

Nothing increases your learning power more than working on something big, real, confusing and frustrating.

查看在线示例

安装

npm install ecma262-jison

构建

Nodejs v6版本以上，推荐使用v8或更高版本

git clone https://github.com/w-y/ecma262-jison.git

构建parser:

npm run buildparser

src到lib:

npm run build

测试：

npm run test

特性

目前已实现ECMAScript(7.0)的大部分语法特性，并扩展了JSX支持

特性	支持	备注
Arrows	✅
Classes	✅
Template Strings	✅	foo`` ❌
Destructuring	✅
Default+Rest+Spread	✅
Let + Const	✅
Unicode	✅	\u{20BB7} ❌
Modules	✅
Enhanced Object Literals	✅
Generators	❌
jsx	✅
Spread Element	✅
Spread Property	✅
ASI	✅	出错加分号重试方式

示例

const code = 'foo;';

const parser = require('ecma262-jison');

const ast = parser.parse(code);

console.log(JSON.stringify(ast, null, 2));

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ecma262-jison's Issues

How are you handling the division and regExp literal ambiguity?

https://stackoverflow.com/questions/5519596/when-parsing-javascript-what-determines-the-meaning-of-a-slash

https://github.com/sweet-js/sweet-core/wiki/design

Is there a separate Lexing phase or is lexing done on demand and provided context by the parser?

Performance and Productive use cases.

Hello again.

Is this project just a "learning experience" or something that is meant to be a "productive" library at some point?

The reason I am asking is because as a productive library I fear it may have great difficulty competing with hand crafted parsers (Acorn/Esprima/Cherow/...) in terms of performance.

See: performance benchmark of parsing libraries

Try on Chrome (V8)
Jison is pretty slow
Optimized hand crafted parsers will be faster than the one used in that benchmark.
I am guessing a Jison based parser would have 3-5% of the performance of something like Acorn/Esprima...

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