feat: add HP48-style RPN calculator sample

This commit is contained in:
2026-04-22 22:25:50 +02:00
parent 2d1bb407e1
commit 13acd6ee96
+408
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>HP48-style RPN Calculator</title>
<style>
:root {
--body: #d8d8d8;
--panel: #202020;
--panel-2: #2b2b2b;
--screen: #d8e7b8;
--screen-text: #1b2a12;
--screen-dim: #5b6f45;
--key: #3a3a3a;
--key-text: #f2f2f2;
--accent: #8cff6d;
--border: #111;
}
* { box-sizing: border-box; }
body {
margin: 0;
font-family: Arial, sans-serif;
background: linear-gradient(180deg, #efefef, var(--body));
color: #111;
}
.wrap {
max-width: 980px;
margin: 0 auto;
padding: 24px;
}
.calc {
background: linear-gradient(180deg, #2f2f2f, #1f1f1f);
border: 1px solid #111;
border-radius: 20px;
padding: 18px;
box-shadow: 0 18px 48px rgba(0, 0, 0, 0.25);
}
.brand {
color: #fafafa;
display: flex;
justify-content: space-between;
align-items: baseline;
margin-bottom: 12px;
gap: 12px;
}
.brand h1 {
margin: 0;
font-size: 18px;
letter-spacing: 0.06em;
}
.brand small {
color: #c9c9c9;
}
.screen {
background: linear-gradient(180deg, #dbe8b8, var(--screen));
color: var(--screen-text);
border: 2px inset #8aa36b;
border-radius: 10px;
padding: 14px;
min-height: 190px;
font-family: "Courier New", monospace;
display: grid;
grid-template-rows: auto auto 1fr;
gap: 10px;
}
.screen-top {
display: flex;
justify-content: space-between;
gap: 12px;
font-size: 12px;
color: var(--screen-dim);
}
.stack {
border-top: 1px solid rgba(27, 42, 18, 0.35);
padding-top: 10px;
line-height: 1.5;
font-size: 18px;
white-space: pre-wrap;
}
.stack-line {
display: grid;
grid-template-columns: 26px 1fr;
gap: 8px;
}
.stack-line .label {
text-align: right;
color: var(--screen-dim);
}
.hidden-input {
position: absolute;
left: -9999px;
width: 1px;
height: 1px;
opacity: 0;
pointer-events: none;
}
.input-row {
display: grid;
grid-template-columns: 1fr 150px;
gap: 12px;
margin-top: 14px;
}
input, select, button {
border-radius: 10px;
border: 1px solid #000;
font: inherit;
}
input, select {
padding: 12px 14px;
background: #f7f7f7;
color: #111;
}
.panel {
margin-top: 14px;
background: rgba(255, 255, 255, 0.04);
border: 1px solid rgba(255, 255, 255, 0.08);
border-radius: 14px;
padding: 14px;
}
.title {
color: #fff;
margin: 0 0 10px;
font-size: 14px;
text-transform: uppercase;
letter-spacing: 0.08em;
}
.buttons {
display: grid;
gap: 8px;
grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
}
button {
padding: 12px 10px;
background: linear-gradient(180deg, #4a4a4a, var(--key));
color: var(--key-text);
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
button:hover { filter: brightness(1.08); }
button:active { transform: translateY(1px); }
.status {
margin-top: 12px;
display: flex;
flex-wrap: wrap;
gap: 10px;
color: #ececec;
font-size: 13px;
}
.pill {
border: 1px solid rgba(255, 255, 255, 0.15);
border-radius: 999px;
padding: 5px 10px;
background: rgba(255, 255, 255, 0.05);
}
.error {
margin-top: 10px;
min-height: 20px;
color: #ff8a8a;
font-family: "Courier New", monospace;
font-size: 13px;
}
.hint {
color: #ddd;
margin-top: 10px;
font-size: 13px;
line-height: 1.5;
}
</style>
</head>
<body>
<div class="wrap">
<div class="calc">
<div class="brand">
<h1>HP48-style RPN</h1>
<small>powered by src/rpn-calculator.js</small>
</div>
<div class="screen" id="screen" tabindex="0" role="application" aria-label="HP48 style calculator screen">
<div class="screen-top">
<div>RPN stack</div>
<div id="modeLabel">deg</div>
</div>
<div id="stack" class="stack"></div>
<div id="display"></div>
</div>
<input id="input" class="hidden-input" type="text" autocomplete="off" aria-hidden="true" tabindex="-1">
<div class="input-row">
<div class="hint">Keyboard input is captured directly by the screen</div>
<select id="angleMode">
<option value="deg">Degrees</option>
<option value="rad">Radians</option>
<option value="grad">Grads</option>
</select>
</div>
<div class="status">
<div class="pill">inputValue: <span id="inputValueLabel"></span></div>
<div class="pill">isEditing: <span id="editingLabel"></span></div>
</div>
<div class="panel">
<div class="title">Stack</div>
<div class="buttons" id="stackButtons"></div>
</div>
<div class="panel">
<div class="title">Arithmetic</div>
<div class="buttons" id="arithButtons"></div>
</div>
<div class="panel">
<div class="title">Trigonometry</div>
<div class="buttons" id="trigButtons"></div>
</div>
<div class="panel">
<div class="title">Constants</div>
<div class="buttons" id="constButtons"></div>
</div>
<div id="error" class="error"></div>
<div class="hint">Use Enter to commit the current value. Buttons call <code>command(...)</code> directly, like a real RPN demo.</div>
</div>
</div>
<script src="../../src/rpn-calculator.js"></script>
<script>
const calc = new RpnCalculator({ angleMode: 'deg' });
const input = document.getElementById('input');
const screen = document.getElementById('screen');
const stackEl = document.getElementById('stack');
const displayEl = document.getElementById('display');
const errorEl = document.getElementById('error');
const inputValueLabel = document.getElementById('inputValueLabel');
const editingLabel = document.getElementById('editingLabel');
const modeLabel = document.getElementById('modeLabel');
const angleMode = document.getElementById('angleMode');
const groups = {
stack: ['enter', 'dup', 'drop', 'swap', 'clear'],
arithmetic: ['add', 'sub', 'mul', 'div', 'mod', 'pow', 'sqr', 'neg', 'sqrt', 'recip', 'log', 'ln'],
trig: ['sin', 'cos', 'tan', 'asin', 'acos', 'atan'],
const: ['pi', 'e'],
};
function labelFor(command) {
return ({ add: '+', sub: '', mul: '×', div: '÷', pow: 'y^x', recip: '1/x', sqr: 'x²' }[command] || command);
}
function addButtons(container, commands) {
container.innerHTML = '';
commands.forEach((commandName) => {
const button = document.createElement('button');
button.textContent = labelFor(commandName);
button.addEventListener('click', () => execute(commandName));
container.appendChild(button);
});
}
function render() {
const stack = calc.stack;
const names = ['T', 'Z', 'Y', 'X'];
const lines = [];
for (let i = 3; i >= 0; i -= 1) {
const value = stack[i];
lines.push(`<div class="stack-line"><div class="label">${names[3 - i]}</div><div>${value !== undefined ? calc.formatNumber(value) : ''}</div></div>`);
}
stackEl.innerHTML = lines.join('');
displayEl.textContent = calc.isEditing ? `ENTERING: ${calc.inputValue}` : 'READY';
inputValueLabel.textContent = calc.inputValue || '∅';
editingLabel.textContent = String(calc.isEditing);
modeLabel.textContent = calc.angleMode;
angleMode.value = calc.angleMode;
errorEl.textContent = '';
}
function execute(name) {
try {
if (name === 'swap') {
if (calc.isEditing) calc.command('enter');
if (calc.stack.length >= 2) calc.swap(0, 1);
} else if (name === 'drop') {
if (calc.stack.length >= 1) calc.remove(0);
} else if (name === 'clear') {
calc.clear();
} else if (name === 'enter') {
if (calc.isEditing) calc.command('enter');
} else if (name === 'pi' || name === 'e') {
calc.command(name);
} else {
calc.command(name);
}
render();
} catch (error) {
errorEl.textContent = error.message;
}
}
function isInputChar(key) {
return /^[0-9a-fA-F.+\-]$/.test(key);
}
function focusScreen() {
screen.focus();
}
function syncInputFromState() {
input.value = calc.inputValue;
}
screen.addEventListener('keydown', (event) => {
try {
if (event.key === 'Enter') {
event.preventDefault();
if (calc.isEditing) {
calc.command('enter');
syncInputFromState();
}
render();
return;
}
if (event.key === 'Backspace') {
event.preventDefault();
if (calc.isEditing) {
calc.inputValue = calc.inputValue.slice(0, -1);
if (calc.inputValue === '') calc.isEditing = false;
syncInputFromState();
render();
}
return;
}
if (isInputChar(event.key)) {
event.preventDefault();
calc.input(event.key);
syncInputFromState();
render();
return;
}
const keyMap = {
'+': 'add',
'-': 'sub',
'*': 'mul',
'/': 'div',
'%': 'mod',
'^': 'pow',
};
if (keyMap[event.key]) {
event.preventDefault();
calc.command(keyMap[event.key]);
render();
}
} catch (error) {
errorEl.textContent = error.message;
}
});
screen.addEventListener('click', focusScreen);
window.addEventListener('load', focusScreen);
angleMode.addEventListener('change', (event) => {
calc.angleMode = event.target.value;
render();
});
addButtons(document.getElementById('stackButtons'), groups.stack);
addButtons(document.getElementById('arithButtons'), groups.arithmetic);
addButtons(document.getElementById('trigButtons'), groups.trig);
addButtons(document.getElementById('constButtons'), groups.const);
render();
focusScreen();
</script>
</body>
</html>