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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<script src="https://cdn.tailwindcss.com"></script>
<script>
tailwind.config = {
theme: {
extend: {
colors: {
clifford: "#da373d",
},
},
},
};
</script>
<script src="./index.js"></script>
</head>
<body class="bg-gray-200">
<div class="max-h-screen flex flex-col p-4">
<div
class="flex flex-col border-b border-gray-200 bg-white px-4 py-5 sm:px-6 mx-auto w-full max-w-5xl rounded max-h-full overflow-y-auto"
>
<a
href="https://book.siddg.com"
class="text-base font-semibold leading-7 text-indigo-600"
>
book.siddg.com
</a>
<h1
class="mt-2 text-3xl font-bold tracking-tight text-gray-900 sm:text-4xl"
>
LISP in JS
</h1>
<p class="mt-2 text-md leading-8">
This is a LISP compiler written in JS. Go through the
commands below to learn the syntax. Input your own Lisp
commands into the textarea below.
</p>
<ul role="list" class="mt-10 overflow-y-auto" id="canvas">
<li class="relative flex gap-x-4">
<div
class="absolute left-0 top-0 flex w-6 justify-center -bottom-6"
>
<div class="w-px bg-gray-200"></div>
</div>
<div
class="relative flex h-6 w-6 flex-none items-center justify-center bg-white"
>
<div
class="h-1.5 w-1.5 rounded-full bg-gray-100 ring-1 ring-gray-300"
></div>
</div>
<pre
class="flex-auto py-0.5 text-sm leading-5 text-gray-500 font-medium text-gray-900"
>
(square 5)
</pre>
</li>
<li class="relative flex gap-x-4">
<div
class="absolute left-0 top-0 flex w-6 justify-center -bottom-6"
>
<div class="w-px bg-indigo-200"></div>
</div>
<div
class="relative flex h-6 w-6 flex-none items-center justify-center bg-white"
>
<div
class="h-1.5 w-1.5 rounded-full bg-indigo-800 ring-1 ring-gray-800"
></div>
</div>
<pre
class="flex-auto py-0.5 text-sm leading-5 text-indigo-800 font-medium text-gray-900"
>
25
</pre>
</li>
</ul>
<!-- New comment form -->
<div class="mt-6 flex flex-col sticky bottom-0 bg-white">
<div
class="overflow-hidden rounded-lg shadow-sm ring-1 ring-inset ring-gray-300 focus-within:ring-2 focus-within:ring-indigo-600 w-full"
>
<textarea
rows="2"
name="lisptext"
id="lisptext"
class="block px-4 w-full resize-none border-0 bg-transparent py-1.5 text-gray-900 placeholder:text-gray-400 focus:ring-0 sm:text-sm sm:leading-6"
placeholder="Add your LISP command. Eg: (square 5)"
></textarea>
</div>
<div class="mt-2 flex">
<div
class="rounded-md bg-indigo-600 cursor-pointer px-2 py-1 text-sm font-semibold text-white shadow-sm hover:bg-indigo-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600"
id="evaluate"
>
Evaluate
</div>
</div>
</div>
</div>
</div>
<script>
var lisp = `
(+ 2 3)
(list 2 3)
(list 1 (+ 2 3) 4 "sid")
(first (list 1 2 3))
(rest (list 1 2 3))
(cons 2 (list 1 2 3))
(length (list 1 2))
(let ((x 10) (y 20))
(+ x y))
(define (square x) (* x x))
(square 2)
(set x (list 1 2 3))
(set x 40)
(square x)
(define (sum-of-squares x y)
(+ (square x) (square y)))
(sum-of-squares 3 4)
(> 2 4)
(if (> 2 4) "two is > 4" "lesser")
(define (! x) (if (< x 1) 1 (* x (! (- x 1)))))
(! 5)
(define (fibo x)
(if
(or (eql x 0) (eql x 1))
1
(+ (fibo (- x 1)) (fibo (- x 2)))
)
)
(fibo 10)
(define
(reverse lst)
(if (eql (length lst) 0)
(list)
(append
(reverse (rest lst))
(list (first lst))
)
)
)
(reverse (list 1 2 3 4 5))
`;
var env = {};
var log = interpreter(parser(lisp), env, (debug = true));
function paintLog() {
// get element by id "canvas"
const canvas = document.getElementById("canvas");
// empty the canvas (not efficient but works for now)
canvas.innerHTML = "";
// for each element in the log
log.map((l, index) => {
// create a new li element of the form
const liContent = `
<div
class="absolute left-0 top-0 flex w-6 justify-center -bottom-6"
>
<div class="w-px bg-gray-200"></div>
</div>
<div
class="relative flex h-6 w-6 flex-none items-center justify-center bg-white"
>
<div
class="h-1.5 w-1.5 rounded-full bg-gray-100 ring-1 ring-gray-300"
></div>
</div>
<pre
class="flex-auto py-0.5 text-sm leading-5 text-gray-500 font-medium text-gray-900"
>
${(l.statement || "").trim()}</pre>`;
const liContent2 = `
<div
class="absolute left-0 top-0 flex w-6 justify-center -bottom-${
index === log.length - 1 ? "6" : "28"
}"
>
<div class="w-px bg-indigo-200"></div>
</div>
<div
class="relative flex h-6 w-6 flex-none items-center justify-center bg-white"
>
<div
class="h-1.5 w-1.5 rounded-full bg-indigo-800 ring-1 ring-gray-800"
></div>
</div>
<pre
class="flex-auto py-0.5 text-xs leading-5 text-indigo-800 font-medium text-gray-900"
> => ${l.eval || ""}</pre>`;
const li = document.createElement("li");
li.className = "relative flex gap-x-4";
li.style.marginTop = index === 0 ? "0px" : "50px";
const li2 = document.createElement("li");
li2.className = "relative flex gap-x-4";
li2.style.marginTop = "10px";
li.innerHTML = liContent;
li2.innerHTML = liContent2;
canvas.appendChild(li);
canvas.appendChild(li2);
});
}
paintLog();
function addLispToJS() {
// get the value of the textarea
const lisptext = document.getElementById("lisptext").value;
if (lisptext && lisptext.trim().length > 0) {
// confirm that this is well formed. i.e, all brackets are closed
// we just need a hacky way to do it. so count number of "(" = ")"
const openBrackets = lisptext.match(/\(/g);
const closedBrackets = lisptext.match(/\)/g);
if (
(openBrackets &&
closedBrackets &&
openBrackets.length !== closedBrackets.length) ||
!openBrackets ||
!closedBrackets
) {
return;
}
// clear textarea
document.getElementById("lisptext").value = "";
// parse the value
const parsed = parser(lisptext);
// evaluate the parsed value
const evaluated = interpreter(parsed, env, (debug = true));
// add the evaluated value to the log
log = log.concat(evaluated);
// paint the log
paintLog();
// scroll canvas to the bottom
const canvas = document.getElementById("canvas");
canvas.scrollTop = canvas.scrollHeight;
}
}
// add a click listener to "evaluate" id button
document
.getElementById("evaluate")
.addEventListener("click", () => {
addLispToJS();
});
// listen to "enter" on the textarea
document
.getElementById("lisptext")
.addEventListener("keydown", (e) => {
if (e.key === "Enter") {
setTimeout(() => addLispToJS(), 100);
}
});
</script>
</body>
</html>