esprima

ECMAScript parsing infrastructure for multipurpose analysis

Description

Esprima serves as a building block for some JavaScript language tools, from code instrumentation to editor autocompletion.

Esprima runs on many popular web browsers, as well as other ECMAScript platforms such as Rhino, Nashorn, and Node.js.

For more information, check the web site esprima.org.

Monthly Downloads: 0

Programming language: TypeScript

License: BSD 2-clause "Simplified" License

Tags: Editors     Parser     JavaScript     Syntax     Ecmascript     Ast     esprima    

Latest version: v2.0.0

README

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.

Features

• Full support for ECMAScript 2019 (ECMA-262 10th 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 (~1600 unit tests with full code coverage)

API

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

A simple example on Node.js REPL:

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

For more information, please read the complete documentation.