Toy

This is the Toy programming language interpreter, written in C.

Special thanks to http://craftinginterpreters.com/ for their fantastic book that set me on this path.

Nifty Features

• Simple C-like syntax
• Bytecode intermediate compilation
• Optional, but robust type system (including opaque for arbitrary data)
• Functions and types are first-class citizens
• Import external libraries
• Fancy slice notation for strings, arrays and dictionaries
• Can re-direct output, error and assertion failure messages
• Open source under the zlib license

Building

For Windows, Linux and MacOS, simply run make in the root directory.

Note: For Linux, you may need to cd into the out directory before running.

Note: MacOS is not officially supported (no machines for testing), but we'll do our best!

Tools

Run make install-tools to install a number of tools, including:

• VSCode syntax highlighting

Syntax

import standard; //for a bunch of utility functions


print "Hello world"; //"print" is a keyword

var msg = "foobar"; //declare a variable like this

assert true, "This message won't be seen"; //assert is another keyword

//-------------------------

fn makeCounter() { //declare a function like this
	var total: int = 0; //declare a variable with a type like this

	fn counter(): int { //declare a return type like this
		return ++total;
	}

	return counter; //closures are explicitly supported
}

var tally = makeCounter();

print tally(); //1
print tally(); //2
print tally(); //3

export tally; //export this variable to the host program

License

This source code is covered by the zlib license (see LICENSE.md).

Patrons via Patreon

• Seth A. Robinson