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https://github.com/bplok20010/eval5
A JavaScript interpreter written in TypeScript - Support ES5
https://github.com/bplok20010/eval5
eval5 interpreter javascript-interpreter js-interpreter sandbox typescript-javascript vm wechat-mini
Last synced: about 1 month ago
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A JavaScript interpreter written in TypeScript - Support ES5
- Host: GitHub
- URL: https://github.com/bplok20010/eval5
- Owner: bplok20010
- License: mit
- Created: 2019-12-29T14:12:27.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2024-04-09T06:17:11.000Z (8 months ago)
- Last Synced: 2024-04-19T09:32:13.720Z (8 months ago)
- Topics: eval5, interpreter, javascript-interpreter, js-interpreter, sandbox, typescript-javascript, vm, wechat-mini
- Language: TypeScript
- Homepage: https://bplok20010.github.io/eval5/
- Size: 1.6 MB
- Stars: 656
- Watchers: 10
- Forks: 97
- Open Issues: 0
-
Metadata Files:
- Readme: README-en_US.md
- License: LICENSE
Awesome Lists containing this project
- awesome-github-star - eval5 - Support ES5 | bplok20010 | 627 | (TypeScript)
README
# eval5
[中文](./README.md) | English
[](https://github.com/bplok20010/eval5/blob/master/LICENSE)
[](https://www.npmjs.com/package/eval5)
[](https://raw.githubusercontent.com/bplok20010/eval5/master/umd/eval5.min.js)
A JavaScript interpreter written in TypeScript, Supports full ES5 syntax.
> Support JavaScript running environment such as browser, node.js, WeChat Mini Program, etc
[Try it out](https://bplok20010.github.io/eval5/)
[Examples](https://bplok20010.github.io/eval5/examples.html)
## You may not need it unless
- Need to execute code in the browser with a sandbox environment
- Controlling execution time
- JavaScript runtime environment that does not support `eval` and `Function`. for example: WeChat Mini Program [demo](https://github.com/bplok20010/eval5-wx-demo)
- Be interested or Be curious
## ECMAScript version supported
ES5
## Install
```
npm install --save eval5
```
## Usage
[](https://codesandbox.io/s/eval5-zxndl?fontsize=14&hidenavigation=1&theme=dark)
```javascript
import { Interpreter } from "eval5";
const interpreter = new Interpreter(window, {
timeout: 1000,
});
let result;
try {
result = interpreter.evaluate("1+1");
console.log(result);
interpreter.evaluate("var a=100");
interpreter.evaluate("var b=200");
result = interpreter.evaluate("a+b");
console.log(result);
} catch (e) {
console.log(e);
}
```
## Options
```ts
interface Options {
// default: 0 not limited
timeout?: number;
// readonly
rootContext?: {} | null;
globalContextInFunction?: any;
}
```
Example
```
import { Interpreter } from "eval5";
const ctx = {};
const interpreter = new Interpreter(ctx, {
rootContext: window,
timeout: 1000,
});
interpreter.evaluate(`
a = 100;
console.log(a); // 100
`);
window.a;//undefined
```
## Interpreter
**`version`**
current version
**`global`**
default: `{}`
global context
```js
Interpreter.global = window;
const interpreter = new Interpreter();
interpreter.evaluate('alert("hello eval5")');
```
**`globalContextInFunction`**
default: `undefined`
`eval5` does not support `use strict` mode, but the default value of `this` in function calls is `undefined`, you can set this property as the default.
```js
import { Interpreter } from "Interpreter";
const ctx = {};
const interpreter = new Interpreter(ctx);
interpreter.evaluate(`
this; // ctx
function func(){
return this; // undefined
}
func();
`);
```
```js
import { Interpreter } from "Interpreter";
Interpreter.globalContextInFunction = window;
const ctx = {};
const interpreter = new Interpreter(ctx);
interpreter.evaluate(`
this; // ctx
function func(){
return this; // window
}
func();
`);
```
Let's take a look at the following example
> **Note: Illegal invocation**
>
> that's why `globalContextInFunction` is set to `undefined`
```
import { Interpreter } from "Interpreter";
Interpreter.globalContextInFunction = {};
const ctx = {alert: alert};
const interpreter = new Interpreter(ctx);
interpreter.evaluate(`
// alert.call({}, 'Hello eval5')
// Illegal invocation
alert('Hello eval5');
`);
```
**`constructor(context = Interpreter.global, options?: Options )`**
---
## Instance methods
**`evaluate(code: string): any`**
executes string code and returns the value of the last expression
```js
import { Interpreter } from "Interpreter";
const interpreter = new Interpreter(window);
const result = interpreter.evaluate(`
var a = 100;
var b = 200;
a+b;
`);
console.log(result); // 300
```
**`appendCode(code: string): any`**
alias of `evaluate`
**`getExecutionTime(): number`**
get the last execution time
**`setExecTimeout(timeout: number = 0): void`**
set the timeout for each execution
**`getOptions(): Readonly`**
get interpreter options
## evaluate(code: string, ctx?: {}, options?: Options)
executes string code and returns the value of the last expression
> note: a new interpreter is created with every execution
```js
import { evaluate } from "eval5";
evaluate(
`
var a = 100;
var b = 100;
console.log(a+b);
`,
{ console: console }
); // 200
evaluate(`
a;
`); // a is not defined
```
## Function
use `Interpreter.global` as the default context, `Interpreter.globalContextInFunction` also
```js
import { Function } from "eval5";
const func = new Function("a", "b", "return a+b;");
console.log(func(100, 200)); // 300
```
## vm
see [vm](https://nodejs.org/dist/latest-v13.x/docs/api/vm.html)
- vm.createContext
- vm.compileFunction
- vm.runInContext
- vm.runInNewContext
- vm.Script
## License
MIT
## Related
- [evaljs](https://github.com/marten-de-vries/evaljs)
- [closure-interpreter](https://github.com/int3/closure-interpreter)