@gerhobbelt/esprima


>
> # NOTE
>
> This fork/clone of esprima tracks the original closely, but adds support for
> parsing JISON action code blocks, which
> MAY contain JISON-specific identifiers in the JavaScript code, e.g. $1, @1,
> #1 and #ID#.
>

Esprima (esprima.org, BSD license) is a high performance,
standard-compliant ECMAScript
parser written in ECMAScript (also popularly known as
JavaScript).
Esprima is created and maintained by Ariya Hidayat,
with the help of many contributors.

$3

- Full support for ECMAScript 2017 (ECMA-262 8th Edition)
- Sensible syntax tree format as standardized by ESTree project
- Experimental support for JSX, a syntax extension for React
- Optional tracking of syntax node location (index-based and line-column)
- Heavily tested (~1500 unit tests with full code coverage)

$3

Esprima can be used to perform lexical analysis (tokenization) or syntactic analysis (parsing) of a JavaScript program.

A simple example on Node.js REPL:

``javascript
> var esprima = require('esprima');
> var program = 'const answer = 42';

> esprima.tokenize(program);
[ { type: 'Keyword', value: 'const' },
{ type: 'Identifier', value: 'answer' },
{ type: 'Punctuator', value: '=' },
{ type: 'Numeric', value: '42' } ]

> esprima.parse(program);
{ type: 'Program',
body:
[ { type: 'VariableDeclaration',
declarations: [Object],
kind: 'const' } ],
sourceType: 'script' }
``

For more information, please read the complete documentation.