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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>4-Stack Forth</title>
<style>
body {
font-family: 'Courier New', monospace;
margin: 0;
padding: 10px;
background-color: #000;
color: #fff;
min-height: 100vh;
display: flex;
flex-direction: column;
}
.container {
max-width: 100%;
flex: 1;
display: flex;
flex-direction: column;
}
h1 {
font-size: 18px;
margin: 0 0 10px 0;
text-align: center;
}
.help {
background-color: #111;
border: 1px solid #333;
padding: 10px;
margin-bottom: 10px;
font-size: 12px;
line-height: 1.3;
}
.help h2 {
margin: 0 0 5px 0;
font-size: 13px;
}
.help p {
margin: 0;
}
.stacks-container {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 8px;
margin-bottom: 10px;
flex: 1;
min-height: 200px;
}
.stack {
border: 2px solid;
padding: 8px;
display: flex;
flex-direction: column;
background-color: #111;
position: relative;
transition: all 0.3s ease;
}
.stack.focused {
border-width: 4px;
box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
transform: scale(1.02);
}
.stack-1 { border-color: #ff6b6b; }
.stack-2 { border-color: #4ecdc4; }
.stack-3 { border-color: #45b7d1; }
.stack-4 { border-color: #f9ca24; }
.stack h3 {
margin: 0 0 8px 0;
text-align: center;
font-size: 12px;
color: #fff;
}
.stack-items {
flex: 1;
display: flex;
flex-direction: column-reverse;
gap: 2px;
align-items: stretch;
}
.stack-item {
background-color: #222;
padding: 4px 6px;
text-align: center;
border: 1px solid #555;
font-size: 12px;
word-break: break-all;
}
.input-section {
margin-bottom: 10px;
}
.input-container {
display: flex;
gap: 5px;
margin-bottom: 8px;
}
#forth-input {
flex: 1;
padding: 8px;
font-family: 'Courier New', monospace;
font-size: 14px;
border: 1px solid #555;
background-color: #111;
color: #fff;
}
#forth-input:focus {
outline: none;
border-color: #fff;
}
button {
padding: 8px 12px;
font-family: 'Courier New', monospace;
font-size: 12px;
border: 1px solid #fff;
background-color: #000;
color: #fff;
cursor: pointer;
}
button:hover, button:active {
background-color: #fff;
color: #000;
}
.output {
background-color: #111;
border: 1px solid #555;
padding: 8px;
height: 300px;
overflow-y: auto;
font-family: 'Courier New', monospace;
font-size: 12px;
line-height: 1.3;
}
/* Semantic section styling */
section {
margin-bottom: 10px;
}
section h2 {
margin: 0 0 8px 0;
font-size: 14px;
color: #fff;
}
.output-section h2 {
margin-bottom: 5px;
}
.error {
color: #fff;
}
.success {
color: #fff;
}
/* Screen reader only content */
.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
/* Mobile optimizations */
@media (max-width: 768px) {
body { padding: 5px; }
h1 { font-size: 16px; }
.help {
font-size: 11px;
padding: 8px;
}
.help h2 {
font-size: 12px;
}
.stacks-container {
gap: 4px;
min-height: 150px;
}
.stack {
padding: 6px;
}
.stack h3 {
font-size: 11px;
margin-bottom: 6px;
}
.stack-item {
font-size: 11px;
padding: 3px 4px;
}
#forth-input {
font-size: 16px; /* Prevents zoom on iOS */
padding: 6px;
}
button {
font-size: 11px;
padding: 6px 10px;
}
.output {
height: 80px;
font-size: 11px;
padding: 6px;
}
}
@media (max-width: 480px) {
.stacks-container {
grid-template-columns: repeat(2, 1fr);
grid-template-rows: repeat(2, 1fr);
}
.input-container {
flex-direction: column;
}
button {
width: 100%;
}
}
</style>
</head>
<body>
<header>
<h1>4-Stack Forth</h1>
</header>
<main class="container">
<section class="help" aria-label="Quick help">
<h2>Quick Help</h2>
<p>Type <strong>help</strong> to see all available words with documentation and stack effects. Add a word to the stack like <code>s" dup"</code> and then run <code>doc</code> to see documentation for that word.</p>
<p><strong>Stack Focus:</strong> Use <code>focus.red</code>, <code>focus.teal</code>, <code>focus.blue</code>, or <code>focus.yellow</code> (or <code>focus.1</code>, <code>focus.2</code>, <code>focus.3</code>, <code>focus.4</code>) to switch which stack operations target. Currently focused: <span id="current-focus">Red (1)</span></p>
</section>
<section class="stacks-container" aria-label="Data stacks">
<h2 class="sr-only">Data Stacks</h2>
<div class="stack stack-1" role="region" aria-label="Stack 1 (Red)" id="stack-1">
<h3>Stack 1 (Red)</h3>
<div class="stack-items" id="stack-1-items" aria-live="polite"></div>
</div>
<div class="stack stack-2" role="region" aria-label="Stack 2 (Teal)" id="stack-2">
<h3>Stack 2 (Teal)</h3>
<div class="stack-items" id="stack-2-items" aria-live="polite"></div>
</div>
<div class="stack stack-3" role="region" aria-label="Stack 3 (Blue)" id="stack-3">
<h3>Stack 3 (Blue)</h3>
<div class="stack-items" id="stack-3-items" aria-live="polite"></div>
</div>
<div class="stack stack-4" role="region" aria-label="Stack 4 (Yellow)" id="stack-4">
<h3>Stack 4 (Yellow)</h3>
<div class="stack-items" id="stack-4-items" aria-live="polite"></div>
</div>
</section>
<section class="input-section" aria-label="Command input">
<h2 class="sr-only">Command Input</h2>
<div class="input-container">
<label for="forth-input" class="sr-only">Forth command input</label>
<input type="text" id="forth-input" placeholder="Enter Forth commands here..." aria-describedby="input-help" />
<button type="button" onclick="executeForth()" aria-label="Execute command">Run</button>
<button type="button" onclick="clearAll()" aria-label="Clear all stacks">Clear</button>
</div>
<div id="input-help" class="sr-only">Press Enter to execute commands</div>
</section>
<section class="output-section" aria-label="Command output">
<h2 class="sr-only">Output</h2>
<div class="output" id="output" role="log" aria-live="polite" aria-label="Forth interpreter output"></div>
</section>
</main>
<script src="forth.js"></script>
<script>
let forthState = ForthInterpreter.createInitialState();
// Update visual display
const updateDisplay = () => {
// Update stacks
forthState.stacks.forEach((stack, index) => {
const container = document.getElementById(`stack-${index + 1}-items`);
container.innerHTML = '';
stack.forEach(item => {
const div = document.createElement('div');
div.className = 'stack-item';
div.textContent = item.toString();
container.appendChild(div);
});
});
// Update focus indicator
document.querySelectorAll('.stack').forEach((stack, index) => {
if (index === forthState.focusedStack) {
stack.classList.add('focused');
} else {
stack.classList.remove('focused');
}
});
// Update focus text
const focusNames = ['Red (1)', 'Teal (2)', 'Blue (3)', 'Yellow (4)'];
document.getElementById('current-focus').textContent = focusNames[forthState.focusedStack];
// Update output
const outputElement = document.getElementById('output');
outputElement.innerHTML = forthState.output
.slice(-100) // Show last 100 messages for better help display
.map(msg => {
const className = msg.startsWith('Error:') ? 'error' : 'success';
return `<div class="${className}">${msg}</div>`;
})
.join('');
outputElement.scrollTop = outputElement.scrollHeight;
};
// Execute Forth commands
const executeForth = () => {
const input = document.getElementById('forth-input');
const command = input.value.trim();
if (command) {
forthState = ForthInterpreter.parseAndExecute(forthState, command);
updateDisplay();
input.value = '';
}
};
// Clear all stacks
const clearAll = () => {
forthState = ForthInterpreter.createInitialState();
updateDisplay();
};
// Handle Enter key in input
document.getElementById('forth-input').addEventListener('keypress', (e) => {
if (e.key === 'Enter') {
executeForth();
}
});
// Initialize display
updateDisplay();
</script>
</body>
</html>
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