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esprima

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    esprima

ECMAScript parsing infrastructure for multipurpose analysis


Version published
Weekly downloads
44M
decreased by-0.82%
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308 kB
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Package description

What is esprima?

Esprima is a high performance, standard-compliant ECMAScript parser written in ECMAScript (also popularly known as JavaScript). It is capable of parsing JavaScript code to produce an abstract syntax tree (AST), which can be used for various purposes such as static analysis, code instrumentation, and transformation.

What are esprima's main functionalities?

Parsing JavaScript Code

This feature allows you to parse a string of JavaScript code and obtain an abstract syntax tree (AST) that represents the structure of the code.

const esprima = require('esprima');
const program = 'const answer = 42;';
const ast = esprima.parseScript(program);

Syntax Tree Analysis

Once you have the AST, you can analyze it to extract information about the code, such as variable names, function declarations, and more.

const esprima = require('esprima');
const program = 'const answer = 42;';
const ast = esprima.parseScript(program);
console.log(ast.body[0].declarations[0].id.name); // 'answer'

Tokenization

Esprima can also be used to tokenize JavaScript code, breaking it down into its lexical components (tokens) such as keywords, identifiers, literals, and operators.

const esprima = require('esprima');
const program = 'const answer = 42;';
const tokens = esprima.tokenize(program);
console.log(tokens);

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Readme

Source

NPM version npm download Build Status Coverage Status

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

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.

Keywords

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Last updated on 13 Jul 2018

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