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mirror of https://github.com/Baidicoot/rpncalc-v4 synced 2024-12-04 23:39:56 +00:00
rpncalc-v4/main.js
2020-05-31 02:52:02 +01:00

59 lines
1.6 KiB
JavaScript

import {execRPN} from './eval.mjs';
import {parseExprs} from './parse.mjs';
import {tokenize} from './token.mjs';
import './builtin.mjs';
const inbox = document.getElementById("inbox")
const outbox = document.getElementById("outbox")
const submit = document.getElementById("submit")
const show = (elem) => {
if (elem.type === "int") {
return elem.val
} else if (elem.type === "pair") {
return "{" + show(elem.val.fst) + ", " + show(elem.val.snd) + "}"
} else if (elem.type === "closure") {
return "(args: {" + prettyprint(elem.args) + "} of " + elem.func.nargs + ")"
} else if (elem.type === "type") {
return elem.val
} else if (elem.type === "array") {
return "[" + prettyprint(elem.val) + "]"
}
}
const prettyprint = (out) => {
let str = "";
for (let i = 0; i < out.length; i++) {
str += show(out[i]);
if (i < out.length - 1) {
str += " ";
}
}
return str;
}
submit.onclick = (event) => {
const input = inbox.value;
let toks = tokenize(input);
if (!toks) {
outbox.innerHTML = "could not parse input: " + input;
return;
}
let ast = parseExprs(toks);
if (!ast.parsed) {
outbox.innerHTML = "incorrect syntax somewhere";
return;
}
console.log(ast.parsed);
try {
let out = execRPN({}, ast.parsed);
if (!out) {
outbox.innerHTML = "failed to execute";
return;
}
console.log(out);
outbox.innerHTML = prettyprint(out.stack);
} catch (error) {
outbox.innerHTML = error;
}
}