as

README

As

This is a toy programming language mostly built for fun. The repository contains an interpreter to run 'as' code. Performance itself is not very fast as this is a tree-walking interpreter.

Build

git clone https://github.com/lczm/as
cd as
go build

Usage

./as {location_of_file}

Language Details

Variables

var a = 10;
var b = 100;
var c = "hello";

Operations

All your standard +, -, *, /, % operators

var a = 10 + 10;
var b = 10 - 10;
var c = 10 * 10;
var d = 10 / 10;
var e = 10 % 10;

Augmented operator assignments, +=, -=, *=, /=, %= operators

var a = 10;
a += 10;
a -= 5;
a *= 2;
a /= 3;
a %= 10;

Increment / Decrements

var a = 10;
var b = 10;

a++;
b--;

Control Flow & Comparison Operators & Logical Operators

Comparison operators include <, >, <=, >=, ==, !=

Logical operators include &&, ||

if (10 < 5) {
    print("10 < 5")
} else {
    print("10 > 5")
}

Loops

While loops

var a = 0;
while (a < 10) {
    a++;
}

For loops

for (var i = 0; i < 10; i++) {

}

Functions

function fib(n) {
    if (n <= 1) {
        return n;
    }
    return fib(n - 2) + fib(n - 1);
}

var a = fib(5);

Containers

Lists

var a = [1, 2, 3];
a = append(a, 4);
a = append(a, 5);

HashMaps

var a = {0:10, 1: 20};
a[0] = 100;
a[1] = 200;
a[2] = 300;

Structures

struct Test {
    var a;
    var b;
    
    init() {
        print("Initialization");
    }
}

var test = Test();
test.a = 10;
print(10);

Builtin Functions

Functions	Definition
print()	Print the out what it the object
len()	Returns the length of the input
type()	Returns the type of the input
append()	Appends an element to the container

Examples : Sieve of Eratosthenes

function sieve(n) {
    var all = [];
    for (var i = 0; i < n+1; i++) {
        all = append(all, true);
    }

    var p = 2;
    while (p * p <= n) {
        if (all[p] == true) {
            for (var i = p * 2; i < n + 1; i+=p) {
                all[i] = false;
            }
        }
        p += 1;
    }

    all[0] = false;
    all[1] = false;

    for (var i = 0; i < n; i++) {
        if (all[i] == true) {
            print(i);
        }
    }
}

sieve(100);

Notes

Since this is a toy language, just use whatever file extension that works for you. For syntax highlighting, it is more convenient to match the language syntax to Javascript (on whatever editor you use.).