132 lines
4.0 KiB
JavaScript
132 lines
4.0 KiB
JavaScript
import { tokenize } from "./modules/lexer.js";
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import { shunt } from "./modules/parser.js";
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import { compute } from "./modules/compute.js";
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function evaluate() {
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const expr = document.querySelector("#expr");
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const modulus = document.querySelector("#modulus");
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const m = BigInt(modulus.value);
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const tokens = tokenize(expr.value);
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console.log(tokens);
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const result = document.querySelector("#result");
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let queue = [];
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try {
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queue = shunt(tokens);
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} catch(e) {
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result.value = e;
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console.log(e);
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return;
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}
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console.log(queue);
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try {
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result.value = compute(queue, m);
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} catch(e) {
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result.value = e;
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console.log(e);
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return;
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}
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}
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const expr = document.querySelector("#expr");
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let selectionStart = 0;
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let selectionEnd = 0;
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function setupExprInput() {
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selectionStart = expr.selectionStart;
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selectionEnd = expr.selectionEnd;
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switchButtons(true);
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}
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function clear() {
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expr.value = "";
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expr.focus();
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}
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function keyPress(c) {
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expr.focus();
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const begin = expr.value.slice(0, selectionStart);
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const end = expr.value.slice(selectionEnd);
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expr.value = begin + c + end;
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expr.setSelectionRange(selectionStart+c.length, selectionStart+c.length);
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}
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function backspace() {
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expr.focus();
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if (selectionEnd === 0) {
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return;
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}
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let begin = null;
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if (selectionStart === selectionEnd) {
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begin = expr.value.slice(0, selectionStart-1);
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} else {
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begin = expr.value.slice(0, selectionStart);
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}
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const end = expr.value.slice(selectionEnd);
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expr.value = begin + end;
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if (selectionStart === 0) {
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expr.setSelectionRange(0, 0);
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} else if (selectionStart === selectionEnd) {
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expr.setSelectionRange(selectionStart-1, selectionStart-1);
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} else {
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expr.setSelectionRange(selectionStart, selectionStart);
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}
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}
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function evalOnEnter(e) {
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if (e.key === "Enter") {
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evaluate();
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}
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}
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function switchButtons(enabled) {
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for (const btn of document.querySelectorAll("#main-buttons button")) {
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btn.disabled = !enabled;
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}
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for (const btn of document.querySelectorAll("#extra-buttons button")) {
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btn.disabled = !enabled;
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}
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}
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document.querySelector("#expr").addEventListener("focus", setupExprInput);
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document.querySelector("#expr").addEventListener("keyup", (e) => evalOnEnter(e));
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document.querySelector("#modulus").addEventListener("focus", () => switchButtons(false));
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document.querySelector("#modulus").addEventListener("keyup", (e) => evalOnEnter(e));
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document.querySelector("#zero").addEventListener("click", () => keyPress("0"));
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document.querySelector("#one").addEventListener("click", () => keyPress("1"));
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document.querySelector("#two").addEventListener("click", () => keyPress("2"));
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document.querySelector("#three").addEventListener("click", () => keyPress("3"));
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document.querySelector("#four").addEventListener("click", () => keyPress("4"));
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document.querySelector("#five").addEventListener("click", () => keyPress("5"));
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document.querySelector("#six").addEventListener("click", () => keyPress("6"));
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document.querySelector("#seven").addEventListener("click", () => keyPress("7"));
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document.querySelector("#eight").addEventListener("click", () => keyPress("8"));
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document.querySelector("#nine").addEventListener("click", () => keyPress("9"));
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document.querySelector("#plus").addEventListener("click", () => keyPress("+"));
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document.querySelector("#minus").addEventListener("click", () => keyPress("-"));
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document.querySelector("#times").addEventListener("click", () => keyPress("*"));
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document.querySelector("#divide").addEventListener("click", () => keyPress("/"));
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document.querySelector("#lparen").addEventListener("click", () => keyPress("("));
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document.querySelector("#rparen").addEventListener("click", () => keyPress(")"));
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document.querySelector("#pow").addEventListener("click", () => keyPress("^"));
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document.querySelector("#inv").addEventListener("click", () => keyPress("^-1"));
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document.querySelector("#sqrt").addEventListener("click", () => keyPress("sqrt("));
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document.querySelector("#clear").addEventListener("click", clear);
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document.querySelector("#enter").addEventListener("click", evaluate);
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document.querySelector("#backspace").addEventListener("click", backspace);
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