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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>ArrayBox</title>
<!-- Default Open Graph / Social Media Preview -->
<meta property="og:type" content="website">
<meta property="og:url" content="https://arraybox.dev">
<meta property="og:title" content="ArrayBox">
<meta property="og:description" content="An online playground for array programming languages — APL, BQN, Uiua, J, Kap, and TinyAPL.">
<meta property="og:image" content="https://arraybox.dev/assets/og-default.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="ArrayBox">
<meta name="twitter:description" content="An online playground for array programming languages — APL, BQN, Uiua, J, Kap, and TinyAPL.">
<meta name="twitter:image" content="https://arraybox.dev/assets/og-default.png">
<link rel="icon" id="favicon" href="assets/apl.png" type="image/png">
<!-- JetBrains Mono loaded locally via @font-face in theme.css -->
<!-- Backend configuration (edit config.js to set your tunnel URL) -->
<script src="config.js"></script>
<!-- Theme CSS with variables and syntax highlighting classes -->
<link rel="stylesheet" href="src/theme.css">
<style>
/* App-specific styles (layout, components) */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
background: var(--bg-gradient);
color: var(--text-color);
display: flex;
justify-content: center;
min-height: 100vh;
padding: 35px;
}
.container {
display: flex;
gap: 18px;
align-items: center;
max-width: 875px;
width: 100%;
margin-top: auto;
margin-bottom: auto;
transition: max-width 0.05s ease-out, margin-left 0.25s ease-out;
}
.language-selector {
position: relative;
}
.language-button {
background: transparent;
border: none;
padding: 24px 37px;
cursor: pointer;
display: flex;
align-items: center;
gap: 24px;
min-width: 184px;
height: 135px;
transition: opacity 0.2s;
}
.language-button:hover {
opacity: 0.8;
}
.language-button img {
width: 98px;
height: 98px;
object-fit: contain;
}
.language-button svg {
width: 98px;
height: 98px;
}
.dropdown {
position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%) scale(0.95);
background: #1f2937;
border: 3px solid #4b5563;
border-radius: 18px;
box-shadow: 0 14px 42px rgba(0, 0, 0, 0.5);
z-index: 2000;
min-width: 400px;
visibility: hidden;
opacity: 0;
pointer-events: none;
transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0s 0.15s;
}
.dropdown.show {
visibility: visible;
opacity: 1;
pointer-events: auto;
transform: translate(-50%, -50%) scale(1);
transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0s 0s;
}
.dropdown-backdrop {
position: fixed;
inset: 0;
background: rgba(0, 0, 0, 0.5);
z-index: 1999;
visibility: hidden;
opacity: 0;
pointer-events: none;
transition: opacity 0.15s ease-out, visibility 0s 0.15s;
}
.dropdown-backdrop.show {
visibility: visible;
opacity: 1;
pointer-events: auto;
transition: opacity 0.15s ease-out, visibility 0s 0s;
}
.dropdown-item {
padding: 22px 30px;
cursor: pointer;
display: flex;
align-items: center;
gap: 22px;
transition: background-color 0.2s;
font-size: 26px;
color: var(--text-color);
white-space: nowrap;
}
.dropdown-item:first-child {
border-radius: 15px 15px 0 0;
}
.dropdown-item:last-child {
border-radius: 0 0 15px 15px;
}
.dropdown-item:hover {
background-color: #374151;
}
.dropdown-item img {
width: 52px;
height: 52px;
object-fit: contain;
}
.dropdown-item svg {
width: 52px;
height: 52px;
}
.dropdown-item .lang-name {
font-weight: 500;
}
.dropdown-item .lang-version {
color: #9CA3AF;
font-size: 21px;
}
/* Hide everything else when language picker is open */
body.lang-picker-open .container {
visibility: hidden;
opacity: 0;
pointer-events: none;
transition: opacity 0.15s ease-out, visibility 0s 0.15s;
}
body.lang-picker-open .keyboard-hint,
body.lang-picker-open .array-keyboard-wrapper,
body.lang-picker-open .f1-doc-tooltip,
body.lang-picker-open .help-screen,
body.lang-picker-open .fonts-screen {
visibility: hidden;
opacity: 0;
pointer-events: none;
transition: opacity 0.15s ease-out, visibility 0s 0.15s;
}
.input-container {
flex: 1;
position: relative;
display: flex;
flex-direction: column;
min-width: 0;
}
.code-input {
width: 100%;
padding: 28px 35px;
border: 3px solid #4b5563;
border-radius: 14px;
font-size: 42px;
font-family: 'Courier New', monospace;
transition: border-color 0.2s;
min-height: 98px;
background: #1f2937;
color: var(--text-color);
white-space: pre;
overflow-x: auto;
overflow-y: auto;
line-height: 1.5;
caret-color: #10b981;
flex-shrink: 0;
}
.code-input:focus {
outline: none;
}
.code-input:empty:before {
content: attr(data-placeholder);
color: #6b7280;
pointer-events: none;
}
.code-input.bqn {
font-family: 'BQN', 'Courier New', monospace;
}
.code-input.uiua {
font-family: 'Uiua', 'Courier New', monospace;
}
.code-input.j {
font-family: 'JetBrains Mono', monospace;
font-variant-ligatures: none;
}
.code-input.apl {
font-family: 'APL', 'Courier New', monospace;
}
.code-input.kap {
font-family: 'Kap', 'Courier New', monospace;
}
.code-input.tinyapl {
font-family: 'TinyAPL', 'Courier New', monospace;
}
.output {
margin-top: 24px;
padding: 28px 35px;
background: #1f2937;
border: 3px solid #4b5563;
border-radius: 14px;
font-family: 'Courier New', monospace;
font-size: 42px;
white-space: pre;
word-wrap: break-word;
display: none;
overflow-y: auto;
overflow-x: hidden;
color: var(--text-color);
line-height: 1.5;
flex-shrink: 0;
}
/* APL-family outputs need tight line-height for box-drawing characters */
.output.tinyapl {
line-height: 0.85;
}
.output.apl {
line-height: 1.13;
}
.output.kap {
line-height: 1;
}
.output.j, .output.bqn {
line-height: 1.13;
}
/* TinyAPL fancy array tables */
.output table.tinyapl-vector,
.output table.tinyapl-matrix,
.output table.tinyapl-cube,
.output table.tinyapl-dictionary,
.output table.tinyapl-enclosure {
border-collapse: collapse;
display: inline-table;
vertical-align: middle;
margin: 4px;
white-space: pre;
}
.output table.tinyapl-vector td,
.output table.tinyapl-matrix td,
.output table.tinyapl-cube td:not(.filler),
.output table.tinyapl-dictionary td,
.output table.tinyapl-enclosure td {
border: 2px solid var(--text-color);
padding: 4px 8px;
text-align: right;
}
.output table table {
margin: 3px;
}
.output .tinyapl-marker {
position: relative;
width: 0;
height: 0;
display: block;
}
.output .tinyapl-vector-marker::before {
content: '→';
position: absolute;
top: -0.6em;
left: 0.15em;
font-size: 0.7em;
color: #888;
}
.output .tinyapl-matrix-marker::before {
content: '↓';
position: absolute;
left: -0.5em;
top: 0.1em;
font-size: 0.7em;
color: #888;
}
.output .tinyapl-cube-marker::before {
content: '↘';
position: absolute;
top: -0.6em;
left: -0.5em;
font-size: 0.7em;
color: #888;
}
.output .tinyapl-dictionary-marker::before {
content: ':';
position: absolute;
top: -0.7em;
font-size: 0.7em;
color: #888;
}
.output .tinyapl-enclosure-marker::before {
content: '⊂';
position: absolute;
top: -0.6em;
font-size: 0.7em;
color: #888;
}
.output .tinyapl-dictionary td:first-child {
text-align: right;
}
.output .tinyapl-cube td.filler {
border: none;
}
.output.bqn {
font-family: 'BQN', 'Courier New', monospace;
}
.output.uiua {
font-family: 'Uiua', 'Courier New', monospace;
}
.output.j {
font-family: 'JetBrains Mono', monospace;
font-variant-ligatures: none;
}
.output.apl {
font-family: 'APL', 'Courier New', monospace;
}
.output.kap {
font-family: 'Kap', 'Courier New', monospace;
}
.output.tinyapl {
font-family: 'TinyAPL', 'Courier New', monospace;
}
.output.show {
display: block;
}
.output.error {
color: var(--error-color);
}
/* Loading indicator for long-running evaluations */
.loading-indicator {
position: absolute;
top: 100%;
left: 0;
right: 0;
margin-top: 24px;
padding: 28px 35px;
background: #1f2937;
border: 3px solid #4b5563;
border-radius: 14px;
display: none;
justify-content: center;
align-items: center;
gap: 8px;
}
.loading-indicator.show {
display: flex;
}
.loading-dot {
width: 12px;
height: 12px;
background: var(--border-hover);
border-radius: 50%;
animation: loading-pulse 1.4s ease-in-out infinite;
}
.loading-dot:nth-child(1) { animation-delay: 0s; }
.loading-dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes loading-pulse {
0%, 80%, 100% {
opacity: 0.3;
transform: scale(0.8);
}
40% {
opacity: 1;
transform: scale(1);
}
}
.bug-report-container {
position: fixed;
bottom: 28px;
right: 35px;
display: flex;
align-items: center;
gap: 14px;
}
.bug-report {
font-family: 'JetBrains Mono', monospace;
font-size: 24px;
font-variant-ligatures: none;
color: var(--border-hover);
text-decoration: none;
opacity: 0.6;
transition: opacity 0.2s;
}
.bug-report:hover {
opacity: 1;
color: var(--text-color);
}
.bug-report-close {
font-family: 'JetBrains Mono', monospace;
font-size: 24px;
font-variant-ligatures: none;
color: var(--border-hover);
background: none;
border: none;
cursor: pointer;
opacity: 0;
transition: opacity 0.2s;
padding: 0;
}
.bug-report-container:hover .bug-report-close {
opacity: 0.6;
}
.bug-report-close:hover {
opacity: 1;
color: var(--text-color);
}
.keyboard-hint {
position: fixed;
bottom: 35px;
left: 50%;
transform: translateX(-50%);
font-family: 'JetBrains Mono', monospace;
font-size: 23px;
font-variant-ligatures: none;
color: var(--text-color);
opacity: 0.6;
pointer-events: none;
transition: opacity 0.5s ease-out;
z-index: 100;
}
.keyboard-hint.hidden {
opacity: 0;
}
/* Ctrl+Space primitive combo box */
.primitive-combobox {
position: absolute;
background: #1f2937;
border: 3px solid #4b5563;
border-radius: 10px;
box-shadow: 0 7px 21px var(--shadow-color);
z-index: 10000;
max-height: 400px;
overflow: hidden;
display: none;
flex-direction: column;
}
.primitive-combobox.show {
display: flex;
}
.primitive-combobox-header {
padding: 18px 18px 18px 18px;
border-bottom: 2px solid #374151;
display: flex;
align-items: center;
gap: 12px;
flex-shrink: 0;
}
.primitive-combobox-input {
flex: 1;
font-family: 'JetBrains Mono', monospace;
font-size: 20px;
font-variant-ligatures: none;
padding: 8px 14px;
border: 2px solid #4b5563;
border-radius: 7px;
background: #111827;
color: var(--text-color);
outline: none;
}
.primitive-combobox-input:focus {
border-color: #6b7280;
outline: none;
}
.primitive-combobox-input::placeholder {
color: #6b7280;
}
.primitive-combobox-hint {
font-family: 'JetBrains Mono', monospace;
font-size: 14px;
color: #6b7280;
}
.primitive-combobox-list {
padding: 8px 0;
flex: 1;
overflow-y: auto;
min-height: 0;
}
.primitive-combobox-item {
padding: 10px 18px;
cursor: pointer;
display: flex;
align-items: center;
gap: 14px;
font-family: 'JetBrains Mono', monospace;
font-size: 18px;
transition: background-color 0.15s;
}
.primitive-combobox-item:hover,
.primitive-combobox-item.selected {
background-color: #374151;
}
.primitive-combobox-item.selected {
border-left: 3px solid #22c55e;
padding-left: 15px;
}
.primitive-combobox-glyph {
font-size: 26px;
min-width: 40px;
text-align: center;
}
.primitive-combobox-glyph.bqn {
font-family: 'BQN', 'Courier New', monospace;
}
.primitive-combobox-glyph.uiua {
font-family: 'Uiua', 'Courier New', monospace;
}
.primitive-combobox-glyph.apl {
font-family: 'APL', 'Courier New', monospace;
}
.primitive-combobox-glyph.kap {
font-family: 'Kap', 'Courier New', monospace;
}
.primitive-combobox-glyph.tinyapl {
font-family: 'TinyAPL', 'Courier New', monospace;
}
.primitive-combobox-name {
flex: 1;
color: var(--text-color);
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.primitive-combobox-name em {
font-style: normal;
background: rgba(34, 197, 94, 0.3);
border-radius: 3px;
padding: 0 2px;
}
.primitive-combobox-shortcut {
font-size: 14px;
color: #9CA3AF;
white-space: nowrap;
}
.primitive-combobox-shortcut kbd {
background: #374151;
border: 1px solid #4b5563;
border-radius: 4px;
padding: 2px 6px;
font-family: 'JetBrains Mono', monospace;
font-size: 13px;
}
.primitive-combobox-empty {
padding: 20px 18px;
text-align: center;
color: #6b7280;
font-family: 'JetBrains Mono', monospace;
font-size: 16px;
}
/* Help screen */
.help-screen {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: var(--bg-gradient);
z-index: 10001;
display: none;
padding: 60px 80px;
overflow-y: auto;
font-family: 'JetBrains Mono', monospace;
font-variant-ligatures: none;
justify-content: center;
align-items: center;
}
.help-screen.show {
display: flex;
}
.help-screen .help-header {
color: #6b7280;
font-size: 18px;
margin-bottom: 50px;
letter-spacing: 0.5px;
}
.help-screen .help-content {
max-width: 600px;
}
.help-screen .help-section {
margin-bottom: 40px;
}
.help-screen .help-section-title {
color: #6b7280;
font-size: 15px;
text-transform: lowercase;
letter-spacing: 1px;
margin-bottom: 16px;
}
.help-screen .help-row {
display: flex;
align-items: baseline;
margin-bottom: 10px;
gap: 20px;
font-size: 18px;
color: var(--text-color);
}
.help-screen .help-key {
min-width: 220px;
color: #9CA3AF;
}
.help-screen .help-desc {
color: #9CA3AF;
}
.help-screen .help-footer {
position: fixed;
bottom: 40px;
left: 80px;
color: #4b5563;
font-size: 15px;
}
/* Fonts screen */
.fonts-screen {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: var(--bg-gradient);
z-index: 10001;
display: none;
padding: 60px 80px;
overflow-y: auto;
font-family: 'JetBrains Mono', monospace;
font-variant-ligatures: none;
justify-content: center;
align-items: center;
}
.fonts-screen.show {
display: flex;
}
.fonts-screen .fonts-header {
color: #6b7280;
font-size: 18px;
margin-bottom: 50px;
letter-spacing: 0.5px;
}
.fonts-screen .fonts-content {
max-width: 400px;
}
.fonts-screen .fonts-title {
color: #6b7280;
font-size: 15px;
text-transform: lowercase;
letter-spacing: 1px;
margin-bottom: 24px;
}
.fonts-screen .font-row {
display: flex;
align-items: baseline;
margin-bottom: 14px;
font-size: 18px;
}
.fonts-screen .font-lang {
min-width: 120px;
color: #9CA3AF;
}
.fonts-screen .font-name {
color: #9CA3AF;
}
.fonts-screen .fonts-footer {
position: fixed;
bottom: 40px;
left: 80px;
color: #4b5563;
font-size: 15px;
}
/* F1 Documentation Tooltip - fixed position to right of editor */
.f1-doc-tooltip {
position: fixed;
top: 50%;
transform: translateY(-50%) translateX(35px);
background: #1f2937;
border: 2px solid #4b5563;
border-radius: 14px;
padding: 21px 24px;
box-shadow: 0 7px 35px rgba(0, 0, 0, 0.5);
width: 560px;
max-width: 560px;
max-height: 90vh;
overflow-y: auto;
font-family: 'JetBrains Mono', monospace;
font-variant-ligatures: none;
z-index: 10002;
opacity: 0;
visibility: hidden;
transition: opacity 0.2s ease-out, visibility 0.2s ease-out, transform 0.25s ease-out;
}
.f1-doc-tooltip.show {
opacity: 1;
visibility: visible;
transform: translateY(-50%) translateX(0);
}
/* When F1 tooltip is shown, shift container left */
body.f1-doc-active .container {
margin-left: -600px;
}
.f1-doc-tooltip-header {
display: flex;
align-items: baseline;
gap: 18px;
margin-bottom: 14px;
padding-bottom: 11px;
border-bottom: 2px solid #374151;
}
.f1-doc-tooltip-glyph {
font-size: 49px;
line-height: 1;
}
.f1-doc-tooltip-type {
font-family: 'JetBrains Mono', monospace;
font-size: 16px;
font-variant-ligatures: none;
color: #9ca3af;
text-transform: uppercase;
letter-spacing: 0.9px;
margin-left: auto;
background: #374151;
padding: 4px 11px;
border-radius: 5px;
}
.f1-doc-tooltip-sig {
font-family: 'JetBrains Mono', monospace;
font-size: 18px;
font-variant-ligatures: none;
color: #60a5fa;
margin-left: 14px;
background: #1e3a5f;
padding: 4px 11px;
border-radius: 5px;
}
.f1-doc-tooltip-section {
margin-bottom: 18px;
padding-bottom: 14px;
border-bottom: 2px solid #374151;
}
.f1-doc-tooltip-section:last-of-type {
border-bottom: none;
margin-bottom: 11px;
padding-bottom: 0;
}
.f1-doc-tooltip-section-title {
font-family: 'JetBrains Mono', monospace;
font-size: 23px;
font-weight: 600;
font-variant-ligatures: none;
color: #60a5fa;
margin-bottom: 7px;
}
.f1-doc-tooltip-section-desc {
font-family: 'JetBrains Mono', monospace;
font-size: 19px;
font-variant-ligatures: none;
color: #d1d5db;
line-height: 1.5;
}
.f1-doc-tooltip-title-line {
font-family: 'JetBrains Mono', monospace;
font-size: 23px;
font-weight: 600;
font-variant-ligatures: none;
color: #e5e7eb;
margin-bottom: 11px;
}
.f1-doc-tooltip-desc {
font-family: 'JetBrains Mono', monospace;
font-size: 21px;
font-variant-ligatures: none;
color: #d1d5db;
line-height: 1.6;
margin-bottom: 18px;
}
.f1-doc-tooltip-example {
font-size: 21px;
color: #e5e7eb;
background: #111827;
padding: 18px;
border-radius: 7px;
white-space: pre-wrap;
overflow-x: auto;
margin-bottom: 14px;
}
.f1-doc-tooltip-link {
font-family: 'JetBrains Mono', monospace;
font-size: 18px;
font-variant-ligatures: none;
color: var(--syntax-function);
text-decoration: none;
opacity: 0.7;
}
.f1-doc-tooltip-link:hover {
opacity: 1;
text-decoration: underline;
}
.f1-doc-tooltip-hint {
font-family: 'JetBrains Mono', monospace;
font-size: 14px;
color: #6b7280;
margin-top: 14px;
padding-top: 11px;
border-top: 1px solid #374151;
}
</style>
</head>
<body>
<div class="dropdown-backdrop" id="dropdownBackdrop"></div>
<div class="dropdown" id="dropdown">
<div class="dropdown-item" data-lang="apl">
<img src="assets/apl.png" alt="APL">
<span class="lang-name">APL</span>
<span class="lang-version">Dyalog v20.0</span>
</div>
<div class="dropdown-item" data-lang="bqn">
<img src="assets/bqn.svg" alt="BQN">
<span class="lang-name">BQN</span>
<span class="lang-version">CBQN 0.11</span>
</div>
<div class="dropdown-item" data-lang="uiua">
<img src="assets/uiua.png" alt="Uiua">
<span class="lang-name">Uiua</span>
<span class="lang-version" id="uiua-version">0.x</span>
</div>
<div class="dropdown-item" data-lang="j">
<img src="assets/j_logo.png" alt="J">
<span class="lang-name">J</span>
<span class="lang-version">J9.7.0-beta10</span>
</div>
<div class="dropdown-item" data-lang="kap">
<img src="assets/kap.png" alt="Kap">
<span class="lang-name">Kap</span>
<span class="lang-version">2026-02-08</span>
</div>
<div class="dropdown-item" data-lang="tinyapl">
<img src="assets/tinyapl.svg" alt="TinyAPL">
<span class="lang-name">TinyAPL</span>
<span class="lang-version" id="tinyapl-version">0.13-beta</span>
</div>
</div>
<div class="container">
<div class="language-selector">
<button class="language-button" id="languageButton" tabindex="2">
<img id="currentLogo" src="assets/apl.png" alt="APL">
</button>
</div>
<div class="input-container">
<div
class="code-input apl"
id="codeInput"
contenteditable="true"
data-placeholder="Have fun! 🥳"
spellcheck="false"
tabindex="1"
></div>