Monkey

An extended Monkey language interpreter in Typescript.

The Extended Monkey Language

In example.monkey:

let log = function(msg) {
  sprint(msg);
  true;
};
let and = function(a, b) {
  if (a) {
    if (b) {
      return true;
    }
    return false;
  }
  return false;
};
let or = function(a, b) {
  if (a) {
    return true;
  }
  if (b) {
    return true;
  }
  return false;
};

log(0);

let a = '1';
log(a);

let b = [1, 2, 'three'];
log(b[1]);

let c = { a: 'bee', c: 'three' };
log(c['c']); // three

and(1, false); // false
or(1, false); // true

$ npx monkey-typescript examples/example.monkey
Log: 0
Log: 1
Log: 2
Log: three
null

REPL

$ npx monkey-typescript
Hello thrashr888! This is the Monkey programming language!
Feel free to type in commands
>>

$ docker run -it thrashr888/monkey-typescript
Hello root! This is the Monkey programming language!
Feel free to type in commands
>>

Usage

$ npm install monkey-typescript

import { NewEnvironment, Lexer, Parser, Eval } from 'monkey-typescript';

let env = NewEnvironment();
let l = new Lexer('sprint("hello!"); let a = 5; 5 * 55;');
let p = new Parser(l);
let program = p.ParseProgram();

if (p.Errors().length !== 0) {
  console.log(p.Errors().forEach(msg => console.log(`\t${msg}`)));
  return;
}

let evaluated = Eval(program, env);
console.log(evaluated.Inspect());

Using require:

var monkeyTypescript = require('monkey-typescript');

let env = monkeyTypescript.NewEnvironment();
let l = new monkeyTypescript.Lexer('sprint("hello!"); let a = 5; 5 * 55;');
let p = new monkeyTypescript.Parser(l);
let program = p.ParseProgram();

if (p.Errors().length !== 0) {
  console.log(p.Errors().forEach(msg => console.log(`\t${msg}`)));
  return;
}

let evaluated = monkeyTypescript.Eval(program, env);
console.log(evaluated.Inspect());

Development

Contributions welcome!

Build

$ nvm use
$ npm install

Run

$ npm start

or:

$ ts-node index.ts

Test

$ npm run test

or watch for file changes:

$ npm run test:live

Publish

# bump version number in `package.json`
# bump version number in `Dockerfile`
# commit and push changes
$ git commit -m'bump version to v0.2.0'
$ git push
$ npm run build
$ npm publish
$ git tag v0.2.0
$ git push origin v0.2.0

Credits

Original Monkey language and source code from the book "Writing an Interpreter in Go" by Thorsten Ball. Translated to Typescript by Paul Thrasher. It's a great book. Buy it!

Typescript Interpreter and Extensions MIT LICENSE

Copyright (c) 2019 Paul Thrasher

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Monkey Language and Go Interpreter MIT LICENSE

Copyright (c) 2016-2017 Thorsten Ball

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.