Jet

An easy to integrate scripting language written in C++.

See the wiki for more detailed info!

Try Jet!

Example

fun fibo(n)
{
	if (n < 2)
		return n;
	else
		return fibo(n-1)+fibo(n-2);
}
print("Fibonacci of 10: ", fibo(10));

General Concepts:

Everything is a global variable unless the local keyword is placed before it.

How to use in your program:

#include <JetContext.h>

Jet::JetContext context;
try
{
	Jet::Value return = context.Script("return 7;");
}
catch (CompilerException e)
{
	//an exception occured while compiling
}

Types

• Numbers

number = 256;
number = 3.1415926535895;

• Strings

string = "hello";

• Objects - a map like type

//how to define objects
obj = {};
obj2 = { hey = 1, apple = 2 };
//two different ways to index items in the object
obj.apple = 2;
obj["apple2"] = 3;

• Arrays - a contiguous array of values with a set size

//how to define arrays
arr = [];
arr2 = [1,2,3,4,5,6];

arr:resize(2);
arr[0] = 255;
arr[1] = "Apples";

• Userdata - used for native user defined types, stores a void*

C++ Bindings

You can bind functions in C++ to Jet as well as bind native types through userdata types and metatables.

• Binding Functions

Jet::JetContext context;
context["myfunction"] = [](JetContext* context, Value* arguments, int numarguments)
{
	printf("Hello from C++!");
};
context.Script("myfunction();");

Outputs "Hello from C++!" to console.

• Creating Userdata

Jet::JetContext context;
auto meta = context.NewPrototype("TypeName");//this is a list of all meta-methods you want to add
meta["t1"] = [](JetContext* context, Value* v, int args)
{
	printf("Hi from metatable!");
};

context["x"] = context.NewUserdata(0/*any native data you want associated*/, meta);
auto out = context.Script("x.t1();");

Outputs "Hi from metatable!" to the console.