HAL

To run the project, run :

make

You will find our compiled program named hal. You can either run the binary with your scheme files as arguments, or you can add the -i option, which enables the shell interactive mode.

💡 Note : You can also add -i after your scheme files, it will loads them into the interactive console.

Available features

name	description	syntax
cons	construct a new list	(cons 1 2)
car	return the first argument of constructed list	(car (cons 1 2))
cdr	return the second argument of a cons	(cdr '(1 3 4))
eq?	check if its two arguments are equal	(eq? 1 1)
atom?	check if its one argument is an atom	(atom? 'foo)
div, mod, +, -	performs the corresponding operation	(div 10 5)
<	check if the first argument is smaller than the second one	(< (* 2 2) 5)
quote, '	returns the argument without evaluating it	(quote (1 1))
lambda	Takes a list of parameters as first argument, and an expresion to evaluate as second argument, returns a lambda (procedure) which can be subsequently called.	(lambda (a b ) (+ a b))
define	If it’s first argument is a symbol, associate the symbol to its second argument, and returns it’s name.If it’s first argument is a list, defines a function which name is the first elemnt of the list, the rest of the listits parameters, and the second argument the function’s body.	(define add (lambda (a b )(+ a b)))
let	Takes a list of key/values as first argument, and an expression as a second argument, evaluate this secondargument within an environement where the key / value pairs are bound.	(let ((a 2) (b (+ 1 2))) (+ a b))
cond	Evaluates each expression of the lists. If the first expression on a list is true, it returns the value of the second element. Otherwise, it tries the next list argument.	(cond (#f 1) (#t (+ 1 1)))