mirror of
https://github.com/actions/setup-python
synced 2024-11-30 21:22:28 +08:00
46 lines
2.4 KiB
Markdown
46 lines
2.4 KiB
Markdown
[](https://www.npmjs.com/package/esprima)
|
|
[](https://www.npmjs.com/package/esprima)
|
|
[](https://travis-ci.org/jquery/esprima)
|
|
[](https://codecov.io/github/jquery/esprima)
|
|
|
|
**Esprima** ([esprima.org](http://esprima.org), BSD license) is a high performance,
|
|
standard-compliant [ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm)
|
|
parser written in ECMAScript (also popularly known as
|
|
[JavaScript](https://en.wikipedia.org/wiki/JavaScript)).
|
|
Esprima is created and maintained by [Ariya Hidayat](https://twitter.com/ariyahidayat),
|
|
with the help of [many contributors](https://github.com/jquery/esprima/contributors).
|
|
|
|
### Features
|
|
|
|
- Full support for ECMAScript 2017 ([ECMA-262 8th Edition](http://www.ecma-international.org/publications/standards/Ecma-262.htm))
|
|
- Sensible [syntax tree format](https://github.com/estree/estree/blob/master/es5.md) as standardized by [ESTree project](https://github.com/estree/estree)
|
|
- Experimental support for [JSX](https://facebook.github.io/jsx/), a syntax extension for [React](https://facebook.github.io/react/)
|
|
- Optional tracking of syntax node location (index-based and line-column)
|
|
- [Heavily tested](http://esprima.org/test/ci.html) (~1500 [unit tests](https://github.com/jquery/esprima/tree/master/test/fixtures) with [full code coverage](https://codecov.io/github/jquery/esprima))
|
|
|
|
### API
|
|
|
|
Esprima can be used to perform [lexical analysis](https://en.wikipedia.org/wiki/Lexical_analysis) (tokenization) or [syntactic analysis](https://en.wikipedia.org/wiki/Parsing) (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.parseScript(program);
|
|
{ type: 'Program',
|
|
body:
|
|
[ { type: 'VariableDeclaration',
|
|
declarations: [Object],
|
|
kind: 'const' } ],
|
|
sourceType: 'script' }
|
|
```
|
|
|
|
For more information, please read the [complete documentation](http://esprima.org/doc). |