115 lines
2.4 KiB
Markdown
115 lines
2.4 KiB
Markdown
[actions]: https://github.com/LuanRT/Jinter/actions
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<h1 align=center>Jinter</h1>
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<p align=center>A tiny JavaScript interpreter written in TypeScript
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<div align="center">
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[][actions]
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</div>
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> **Note**: This project was originally developed for use in [YouTube.js](https://github.com/LuanRT/YouTube.js).
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## Table of Contents <!-- omit in toc -->
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- [Installation](#installation)
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- [Usage](#usage)
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- [API](#api)
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- [`evaluate(input: string)`](#evaluateinput-string)
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- [`visitor`](#visitor)
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- [`scope`](#scope)
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- [License](#license)
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## Installation
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```sh
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npm install jintr
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```
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## Usage
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Execute some JavaScript code:
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```ts
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// const Jinter = require('jintr').default;
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import { Jinter } from 'jintr';
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const code = `
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function sayHiTo(person) {
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console.log('Hi ' + person + '!');
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}
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sayHiTo('mom');
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`
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const jinter = new Jinter();
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jinter.evaluate(code);
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```
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---
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Inject your own functions, objects, etc:
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```ts
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import { Jinter } from 'jintr';
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const jinter = new Jinter();
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const code = `
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console.log(new SomeClass().a);
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console.log('hello'.toArray());
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function myFn() {
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console.log('[myFn]: Who called me?');
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}
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myFn();
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`;
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class SomeClass {
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constructor() {
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this.a = 'this is a test';
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}
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}
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jinter.defineObject('SomeClass', SomeClass);
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// Ex: str.toArray();
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jinter.visitor.on('toArray', (node, visitor) => {
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if (node.type === 'CallExpression' && node.callee.type === 'MemberExpression') {
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const obj = visitor.visitNode(node.callee.object);
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return obj.split('');
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}
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});
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// Intercept function calls
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jinter.visitor.on('myFn', (node) => {
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if (node.type == 'CallExpression')
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console.info('myFn was called!');
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return '__continue_exec';
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});
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jinter.evaluate(code);
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```
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For more examples see [`/test`](https://github.com/LuanRT/Jinter/tree/main/test) and [`/examples`](https://github.com/LuanRT/Jinter/tree/main/examples).
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## API
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* Jinter()
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* [`evaluate(input: string)`](#evaluate)
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* [`visitor`](#visitor)
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* [`scope`](#scope)
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### `evaluate(input: string)`
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Evaluates the given JavaScript code.
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### `visitor`
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The node visitor. This is responsible for walking the AST and executing the nodes.
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### `scope`
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Represents the global scope of the program.
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## License
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Distributed under the [MIT](https://choosealicense.com/licenses/mit/) License.
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<p align="right">
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(<a href="#top">back to top</a>)
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</p>
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