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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>SpudLang 🥔 — by DS & Jay</title>
<style>
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
background: #0d0a07;
color: #e8dccb;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
display: flex; flex-direction: column; overflow: hidden;
-webkit-font-smoothing: antialiased;
}
/* ============ TOP BAR ============ */
.topbar {
display: flex; align-items: center; justify-content: space-between;
gap: 14px; flex-wrap: wrap;
padding: 10px 18px;
background: linear-gradient(180deg, #1c130c, #130d08);
border-bottom: 1px solid #2a1e14;
z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
font-size: 28px; line-height: 1;
filter: drop-shadow(0 0 14px rgba(255,159,67,.5));
animation: bob 3.2s ease-in-out infinite;
}
@keyframes bob {
0%,100% { transform: translateY(0) rotate(-6deg); }
50% { transform: translateY(-5px) rotate(6deg); }
}
.brand h1 {
margin: 0; font-size: 17px; letter-spacing: .4px;
background: linear-gradient(90deg, #ffc06b, #ff8a5c);
-webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand p { margin: 1px 0 0; font-size: 11px; color: #7c6a56; letter-spacing: .3px; }
.brand p b { color: #ffb347; font-weight: 600; }
.credit {
font-size: 11px; color: #ff9f43;
background: rgba(255,159,67,.08);
border: 1px solid rgba(255,159,67,.2);
padding: 4px 10px; border-radius: 20px;
letter-spacing: .3px; white-space: nowrap;
}
.credit b { color: #ffc06b; font-weight: 700; }
.actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
button {
font-family: inherit; font-size: 12.5px; font-weight: 600;
color: #e8dccb; background: #211810;
border: 1px solid #35261a; border-radius: 8px;
padding: 7px 12px; cursor: pointer;
transition: .15s ease;
}
button:hover { background: #302216; border-color: #5c4128; transform: translateY(-1px); }
button:active { transform: translateY(0); }
button.primary {
background: linear-gradient(180deg, #ff9f43, #e8761f);
border-color: #ffb347; color: #2a1608;
box-shadow: 0 3px 14px rgba(255,140,50,.28);
}
button.primary:hover { background: linear-gradient(180deg, #ffb05c, #f58528); }
kbd {
font-family: ui-monospace, Menlo, Consolas, monospace;
font-size: 10px; opacity: .7;
background: rgba(0,0,0,.2); padding: 1px 5px; border-radius: 4px; margin-left: 4px;
}
/* ============ LAYOUT ============ */
main { flex: 1; display: flex; min-height: 0; gap: 12px; padding: 12px; }
.pane {
display: flex; flex-direction: column; min-height: 0; min-width: 0;
background: #16110c; border: 1px solid #261c13;
border-radius: 12px; overflow: hidden;
box-shadow: 0 8px 30px rgba(0,0,0,.4);
}
.editor-pane { flex: 1.25; }
.output-pane { flex: 1; }
.pane-head {
display: flex; align-items: center; gap: 8px;
padding: 9px 14px; font-size: 11.5px; letter-spacing: .6px;
color: #9d856a; text-transform: lowercase;
background: #18120d; border-bottom: 1px solid #261c13;
font-family: ui-monospace, Menlo, Consolas, monospace;
}
.dot { width: 9px; height: 9px; border-radius: 50%; background: #ff9f43; box-shadow: 0 0 8px #ff9f43; }
.dot.green { background: #a8d977; box-shadow: 0 0 8px #a8d977; }
.pane-head .right { margin-left: auto; font-size: 11px; color: #6a5947; }
.saved { color: #7ab85a; font-size: 11px; transition: opacity .3s; }
/* ============ EDITOR ============ */
.editor { flex: 1; display: flex; min-height: 0; position: relative; }
.gutter {
width: 54px; flex: none; overflow: hidden; position: relative;
background: #120c08; border-right: 1px solid #221910;
}
.gutter-inner {
position: absolute; top: 0; left: 0; right: 0;
padding: 16px 10px 16px 0;
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
font-size: 14px; line-height: 1.7;
text-align: right; color: #4d3e2e; white-space: pre;
will-change: transform;
}
.codewrap { position: relative; flex: 1; min-width: 0; }
.highlight, #src {
position: absolute; inset: 0; margin: 0; padding: 16px;
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
font-size: 14px; line-height: 1.7; letter-spacing: 0;
white-space: pre; tab-size: 2; overflow-wrap: normal;
overflow: auto; border: 0;
}
.highlight {
z-index: 1; pointer-events: none; color: #e8dccb;
scrollbar-width: none;
}
.highlight::-webkit-scrollbar { display: none; }
#src {
z-index: 2; background: transparent; color: transparent;
caret-color: #ffb347; resize: none; outline: none;
scrollbar-width: thin; scrollbar-color: #3a2a1c transparent;
}
#src::-webkit-scrollbar { width: 10px; height: 10px; }
#src::-webkit-scrollbar-thumb { background: #3a2a1c; border-radius: 6px; border: 2px solid #16110c; }
#src::selection { background: rgba(255,159,67,.3); }
.c-kw { color: #ff9f43; font-weight: 600; }
.c-str { color: #a8d977; }
.c-num { color: #ffd166; }
.c-com { color: #6a5947; font-style: italic; }
.c-op { color: #ff7ab6; }
.c-br { color: #8fb8ff; }
.c-fn { color: #6fd3e0; }
.c-id { color: #e8dccb; }
.c-magic { color: #ff5c8a; font-weight: 700; text-shadow: 0 0 12px rgba(255,92,138,.5); }
/* ============ TERMINAL ============ */
.terminal {
flex: 1; overflow: auto; padding: 12px 14px 14px;
background: #1e1e1e;
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Cascadia Mono', monospace;
font-size: 13px; line-height: 1.5;
color: #cccccc;
scrollbar-width: thin; scrollbar-color: #3a3a3a transparent;
cursor: text;
}
.terminal::-webkit-scrollbar { width: 10px; }
.terminal::-webkit-scrollbar-thumb { background: #3a3a3a; border-radius: 6px; border: 2px solid #1e1e1e; }
.term-line {
white-space: pre-wrap; word-break: break-word;
animation: fadein .15s ease;
min-height: 1.5em;
}
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }
.term-line.out { color: #cccccc; }
.term-line.meta { color: #6a6a6a; font-style: italic; }
.term-line.success { color: #4ec9b0; }
.term-line.warn { color: #dcdcaa; }
.term-line.prompt { color: #9cdcfe; font-weight: 600; }
.term-line.error-head{ color: #f48771; font-weight: 700; }
.term-line.error-ctx { color: #d4d4d4; background: rgba(244,135,113,.08);
border-left: 3px solid #f48771; padding-left: 10px; margin: 2px 0; }
.term-line.error-car { color: #f48771; font-weight: 700; }
.term-line.error-msg { color: #f48771; padding-left: 4px; }
/* inline input line — VS Code terminal style */
.term-input-line {
display: flex; align-items: baseline; gap: 0;
font-family: inherit; font-size: inherit; line-height: 1.5;
color: #cccccc;
}
.term-input-line .prompt-sym {
color: #4ec9b0; font-weight: 700; white-space: pre;
}
.term-input {
flex: 1;
background: transparent; border: 0; outline: none;
color: #cccccc; font-family: inherit; font-size: inherit;
padding: 0; margin: 0; caret-color: #aeafad;
line-height: inherit;
}
.term-input::selection { background: rgba(38,79,120,.9); }
/* ============ CHEAT SHEET ============ */
.cheat {
position: fixed; inset: 0; z-index: 50;
background: rgba(8,5,3,.85); backdrop-filter: blur(6px);
display: none; align-items: flex-start; justify-content: center;
padding: 30px 16px; overflow: auto;
}
.cheat.open { display: flex; }
.cheat-card {
background: #16110c; border: 1px solid #35261a; border-radius: 14px;
max-width: 820px; width: 100%;
padding: 26px 30px 22px; box-shadow: 0 28px 80px rgba(0,0,0,.8);
animation: rise .22s ease;
}
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.cheat-card h2 {
margin: 0 0 4px; font-size: 20px;
background: linear-gradient(90deg, #ffc06b, #ff8a5c);
-webkit-background-clip: text; background-clip: text; color: transparent;
}
.cheat-card .sub { color: #8a745c; font-size: 12.5px; margin-bottom: 20px; }
.cheat-card h3 {
margin: 22px 0 8px; font-size: 14px; color: #ffb347;
letter-spacing: .3px; display: flex; align-items: center; gap: 8px;
}
.cheat-card h3::before {
content: ''; width: 6px; height: 6px; border-radius: 50%;
background: #ff9f43; box-shadow: 0 0 8px #ff9f43;
}
.cheat-card p { margin: 6px 0; font-size: 13px; color: #b8a58e; line-height: 1.7; }
.cheat-card ul { margin: 6px 0; padding-left: 20px; }
.cheat-card li { font-size: 13px; color: #b8a58e; line-height: 1.8; }
.cheat-card code, .cheat-card pre {
font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12.5px;
}
.cheat-card code {
background: #211810; color: #ffb347;
padding: 1px 6px; border-radius: 5px;
border: 1px solid #2a1e14;
}
.cheat-card pre {
background: #0d0a07; border: 1px solid #211810; border-radius: 9px;
padding: 12px 14px; margin: 8px 0; overflow-x: auto;
color: #e8dccb; line-height: 1.65;
}
.cheat-card pre .k { color: #ff9f43; font-weight: 600; }
.cheat-card pre .s { color: #a8d977; }
.cheat-card pre .n { color: #ffd166; }
.cheat-card pre .c { color: #6a5947; font-style: italic; }
.cheat-card pre .m { color: #ff5c8a; font-weight: 700; }
.cheat-card .rules {
background: rgba(255,159,67,.05);
border: 1px solid rgba(255,159,67,.15);
border-radius: 9px; padding: 12px 18px; margin: 10px 0;
}
.cheat-card .rules ol { margin: 0; padding-left: 20px; }
.cheat-card .rules li { color: #d8c5a8; }
.cheat-close { margin-top: 24px; width: 100%; padding: 11px; font-size: 13px; }
.credit-line {
text-align: center; margin-top: 18px; padding-top: 14px;
border-top: 1px solid #211810;
font-size: 11.5px; color: #7c6a56;
}
.credit-line b { color: #ff9f43; }
@media (max-width: 880px) {
main { flex-direction: column; }
.editor-pane, .output-pane { flex: 1 1 50%; }
.credit { display: none; }
}
</style>
</head>
<body>
<header class="topbar">
<div class="brand">
<span class="logo">🥔</span>
<div>
<h1>SpudLang <span style="font-size:12px;opacity:.7">v0.3</span></h1>
<p>every program ends with <b>run spud</b></p>
</div>
</div>
<div class="actions">
<span class="credit">made by <b>DS</b> & <b>Jay</b></span>
<button id="cheatBtn">📖 Cheat sheet</button>
<button id="clearBtn">🧹 Clear</button>
<button class="primary" id="runBtn">▶ Run<kbd>Ctrl↵</kbd></button>
</div>
</header>
<main>
<section class="pane editor-pane">
<div class="pane-head">
<span class="dot"></span> main.spud
<span class="right"><span class="saved" id="saved">saved ✓</span> · <span id="cursor">Ln 1, Col 1</span></span>
</div>
<div class="editor">
<div class="gutter"><div class="gutter-inner" id="gutter"></div></div>
<div class="codewrap">
<pre class="highlight" id="highlight"><code id="hlcode"></code></pre>
<textarea id="src" spellcheck="false" autocomplete="off" autocapitalize="off" autocorrect="off" wrap="off"></textarea>
</div>
</div>
</section>
<section class="pane output-pane">
<div class="pane-head">
<span class="dot green"></span> terminal
<span class="right" id="status">idle</span>
</div>
<div class="terminal" id="terminal"></div>
</section>
</main>
<!-- ===================== CHEAT SHEET ===================== -->
<div class="cheat" id="cheat">
<div class="cheat-card">
<h2>🥔 How SpudLang Works</h2>
<div class="sub">A tiny language with sharp edges. Read once, never peel wrong again.</div>
<h3>Running a program</h3>
<p>SpudLang reads top-to-bottom. Nothing executes until it hits <code>run spud</code> — that's the ignition. It must be the <b>very last line</b> of the file.</p>
<pre><span class="k">mash</span> <span class="s">"Hello, potato!"</span>
<span class="m">run spud</span></pre>
<h3>Variables</h3>
<p>Plant with <code>spud</code>. Reassign with just the name — but only if it already exists.</p>
<pre><span class="k">spud</span> age = <span class="n">25</span>
age = <span class="n">26</span> <span class="c"># ok, age exists</span>
score = <span class="n">10</span> <span class="c"># ERROR: never planted</span></pre>
<p>Blocks <code>{ }</code> have their own scope. Variables don't leak out.</p>
<h3>Input & output</h3>
<p><code>mash</code> prints. <code>ask "prompt"</code> waits for the user to type — always returns <b>text</b>, even if they typed a number.</p>
<pre><span class="k">spud</span> name = <span class="k">ask</span> <span class="s">"What's your name? "</span>
<span class="k">mash</span> <span class="s">"Hello, "</span> + name
<span class="k">spud</span> n = <span class="k">num</span>(<span class="k">ask</span> <span class="s">"Age? "</span>) <span class="c"># convert to number</span></pre>
<h3>Conditionals</h3>
<pre><span class="k">ish</span> age >= <span class="n">18</span> {
<span class="k">mash</span> <span class="s">"Can vote."</span>
} <span class="k">nope ish</span> age >= <span class="n">13</span> {
<span class="k">mash</span> <span class="s">"Teenager."</span>
} <span class="k">nope</span> {
<span class="k">mash</span> <span class="s">"Kid."</span>
}</pre>
<h3>Loops</h3>
<ul>
<li><code>loop i from 1 to 5 { }</code> — counts 1..5, inclusive. <code>i</code> only lives inside.</li>
<li><code>keep cond { }</code> — repeats while true. Change something inside or it overheats.</li>
<li><code>peel</code> — break out of the loop.</li>
<li><code>sprout</code> — skip to the next round.</li>
</ul>
<pre><span class="k">loop</span> i <span class="k">from</span> <span class="n">1</span> <span class="k">to</span> <span class="n">10</span> {
<span class="k">ish</span> i % <span class="n">2</span> == <span class="n">0</span> { <span class="k">sprout</span> }
<span class="k">mash</span> i
}</pre>
<h3>Recipes (functions)</h3>
<pre><span class="k">recipe</span> add(a, b) {
<span class="k">serve</span> a + b
}
<span class="k">mash</span> add(<span class="n">2</span>, <span class="n">3</span>) <span class="c"># 5</span></pre>
<p>Recipes without <code>serve</code> return <code>nada</code>.</p>
<h3>Values</h3>
<ul>
<li>Numbers: <code>42</code>, <code>3.14</code>, <code>-7</code></li>
<li>Text: <code>"hello"</code> or <code>'hi'</code></li>
<li>Truths: <code>yep</code> (true), <code>nah</code> (false)</li>
<li>Nothing: <code>nada</code></li>
<li>Logic: <code>and</code>, <code>or</code>, <code>not</code></li>
<li>Compare: <code>==</code>, <code>!=</code>, <code><</code>, <code>></code>, <code><=</code>, <code>>=</code></li>
</ul>
<p>Only <code>nah</code>, <code>nada</code>, <code>0</code>, and <code>""</code> are false. Everything else is true.</p>
<h3>The rules of the potato</h3>
<div class="rules">
<ol>
<li>Every program ends with <code>run spud</code>.</li>
<li>Variables must be planted with <code>spud</code> before use.</li>
<li>Blocks <code>{ }</code> have their own scope.</li>
<li><code>+</code> works on two numbers OR two texts. Mixing is an error — use <code>str()</code> or <code>num()</code>.</li>
<li><code>peel</code> / <code>sprout</code> only inside loops.</li>
<li>Numbers and text are never equal. <code>1 == "1"</code> is false.</li>
</ol>
</div>
<h3>Built-in spuds</h3>
<ul>
<li><code>len(text)</code> — length of a string</li>
<li><code>scream(text)</code> / <code>whisper(text)</code> — uppercase / lowercase</li>
<li><code>abs</code>, <code>floor</code>, <code>ceil</code>, <code>round</code>, <code>sqrt</code> — math</li>
<li><code>random(lo, hi)</code> — random integer, inclusive</li>
<li><code>str(x)</code> / <code>num(x)</code> — convert text ↔ number</li>
<li><code>type(x)</code> — description of <code>x</code></li>
<li><code>max(...)</code> / <code>min(...)</code> — largest / smallest</li>
<li><code>repeat(text, n)</code> — repeat text</li>
<li><code>potato()</code> — 🥔</li>
</ul>
<button class="cheat-close" id="cheatClose">Got it — close</button>
<div class="credit-line">SpudLang v0.3 · lovingly mashed by <b>DS</b> & <b>Jay</b> 🥔</div>
</div>
</div>
<script>
/* =========================================================================
SpudLang 🥔 v0.3
made by DS & Jay
- every program ends with "run spud"
- strict typing (no text + number)
- block scoping
- ask() reads input via terminal
========================================================================= */
const KEYWORDS = new Set([
'spud','mash','ask','ish','nope','keep','loop','from','to','recipe','serve',
'and','or','not','yep','nah','nada','peel','sprout','run'
]);
const BUILTIN_NAMES = new Set([
'len','scream','whisper','abs','floor','ceil','round','sqrt','random',
'str','num','type','potato','repeat','max','min'
]);
class SpudError extends Error {
constructor(message, line, col) {
super(message);
this.name = 'SpudError';
this.line = line || 0;
this.col = col || 0;
}
}
/* ------------------------- LEXER --------------------------------------- */
const isDigit = c => c >= '0' && c <= '9';
const isAlpha = c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c === '_';
const isAlnum = c => isAlpha(c) || isDigit(c);
const TWO_CHAR_OPS = new Set(['==','!=','<=','>=']);
const ONE_CHAR_OPS = new Set(['+','-','*','/','%','=','<','>']);
const PUNCT = new Set(['(',')','{','}',',']);
function tokenize(source) {
const tokens = [];
let i = 0, line = 1, col = 1;
const n = source.length;
function adv() {
if (source[i] === '\n') { line++; col = 1; }
else { col++; }
i++;
}
while (i < n) {
const ch = source[i];
if (ch === ' ' || ch === '\t' || ch === '\r' || ch === '\n') { adv(); continue; }
if (ch === '#') { while (i < n && source[i] !== '\n') adv(); continue; }
if (ch === '"' || ch === "'") {
const sl = line, sc = col;
adv();
let str = '', closed = false;
while (i < n) {
const c = source[i];
if (c === '\\') {
adv();
const e = source[i];
if (e === undefined) break;
str += e === 'n' ? '\n' : e === 't' ? '\t' : e === 'r' ? '\r' : e;
adv();
continue;
}
if (c === ch) { adv(); closed = true; break; }
str += c;
adv();
}
if (!closed) throw new SpudError('Unterminated string — you forgot the closing quote.', sl, sc);
tokens.push({ type: 'STRING', value: str, line: sl, col: sc });
continue;
}
if (isDigit(ch)) {
const sl = line, sc = col;
let num = '';
while (i < n && (isDigit(source[i]) || source[i] === '.')) { num += source[i]; adv(); }
const v = parseFloat(num);
if (Number.isNaN(v)) throw new SpudError(`"${num}" isn't a valid number.`, sl, sc);
tokens.push({ type: 'NUMBER', value: v, line: sl, col: sc });
continue;
}
if (isAlpha(ch)) {
const sl = line, sc = col;
let id = '';
while (i < n && isAlnum(source[i])) { id += source[i]; adv(); }
tokens.push({
type: KEYWORDS.has(id) ? 'KEYWORD' : 'IDENT',
value: id, line: sl, col: sc
});
continue;
}
const two = source.substr(i, 2);
if (TWO_CHAR_OPS.has(two)) {
tokens.push({ type: 'OP', value: two, line, col });
adv(); adv();
continue;
}
if (ONE_CHAR_OPS.has(ch)) {
tokens.push({ type: 'OP', value: ch, line, col });
adv();
continue;
}
if (PUNCT.has(ch)) {
tokens.push({ type: 'PUNC', value: ch, line, col });
adv();
continue;
}
throw new SpudError(`I don't know what "${ch}" means. Spuds only speak potato.`, line, col);
}
tokens.push({ type: 'EOF', value: null, line, col });
return tokens;
}
/* ------------------------- PARSER -------------------------------------- */
class Parser {
constructor(tokens) { this.t = tokens; this.p = 0; }
peek(k = 0) { return this.t[Math.min(this.p + k, this.t.length - 1)]; }
at(type, value) {
const t = this.peek();
return t.type === type && (value === undefined || t.value === value);
}
atKw(v) { return this.at('KEYWORD', v); }
next() { return this.t[this.p++]; }
eat(type, value) { if (this.at(type, value)) return this.next(); return null; }
expect(type, value, msg) {
if (this.at(type, value)) return this.next();
const t = this.peek();
const found = t.type === 'EOF' ? 'the end of the file' : `"${t.value}"`;
throw new SpudError(msg || `Expected "${value}" but found ${found}.`, t.line, t.col);
}
parseProgram() {
const body = [];
while (!this.at('EOF')) body.push(this.parseStatement());
return { type: 'Program', body };
}
parseBlock() {
this.expect('PUNC', '{', 'Expected "{" to open a block.');
const body = [];
while (!this.at('PUNC', '}') && !this.at('EOF')) body.push(this.parseStatement());
this.expect('PUNC', '}', 'Expected "}" to close the block.');
return { type: 'Block', body };
}
parseStatement() {
const t = this.peek();
if (t.type === 'KEYWORD') {
switch (t.value) {
case 'run': return this.parseRunMarker();
case 'spud': return this.parseVarDecl();
case 'mash': return this.parsePrint();
case 'ask': return this.parseExprStatement();
case 'ish': return this.parseIf();
case 'keep': return this.parseWhile();
case 'loop': return this.parseFor();
case 'recipe': return this.parseFunc();
case 'serve': return this.parseReturn();
case 'peel': this.next(); return { type: 'Break', line: t.line };
case 'sprout': this.next(); return { type: 'Continue', line: t.line };
}
}
if (this.at('PUNC', '{')) return this.parseBlock();
const startLine = t.line;
const expr = this.parseExpression();
if (this.at('OP', '=')) {
const eq = this.next();
if (expr.type !== 'Identifier') {
throw new SpudError('You can only assign to a variable name.', eq.line, eq.col);
}
const value = this.parseExpression();
return { type: 'Assign', name: expr.name, value, line: expr.line };
}
return { type: 'ExprStmt', expr, line: startLine };
}
parseRunMarker() {
const kw = this.next();
const spudTok = this.peek();
if (!(spudTok.type === 'KEYWORD' && spudTok.value === 'spud')) {
throw new SpudError('"run" must be followed by "spud". The magic words are: run spud', kw.line, kw.col);
}
this.next();
if (!this.at('EOF')) {
const t = this.peek();
throw new SpudError('Nothing comes after "run spud". It must be the very last line.', t.line, t.col);
}
return { type: 'RunMarker', line: kw.line };
}
parseExprStatement() {
const startLine = this.peek().line;
return { type: 'ExprStmt', expr: this.parseExpression(), line: startLine };
}
parseVarDecl() {
const kw = this.next();
const name = this.expect('IDENT', undefined, 'Expected a variable name after "spud".');
this.expect('OP', '=', 'Expected "=" after the variable name.');
const value = this.parseExpression();
return { type: 'VarDecl', name: name.value, value, line: kw.line };
}
parsePrint() {
const kw = this.next();
const args = [];
const startLine = kw.line;
// stop if next token is on a different line, closing brace, EOF, or "nope"
const shouldStop = () => {
if (this.at('PUNC', '}') || this.at('EOF')) return true;
if (this.atKw('nope')) return true;
return this.peek().line !== startLine;
};
if (!shouldStop()) {
args.push(this.parseExpression());
while (this.eat('PUNC', ',')) args.push(this.parseExpression());
}
return { type: 'Print', args, line: kw.line };
}
parseIf() {
const kw = this.next();
const cond = this.parseExpression();
const then = this.parseBlock();
let otherwise = null;
if (this.atKw('nope')) {
this.next();
otherwise = this.atKw('ish') ? this.parseIf() : this.parseBlock();
}
return { type: 'If', cond, then, otherwise, line: kw.line };
}
parseWhile() {
const kw = this.next();
const cond = this.parseExpression();
const body = this.parseBlock();
return { type: 'While', cond, body, line: kw.line };
}
parseFor() {
const kw = this.next();
const v = this.expect('IDENT', undefined, 'Expected a variable name after "loop".');
this.expect('KEYWORD', 'from', 'Expected "from" in the loop.');
const start = this.parseExpression();
this.expect('KEYWORD', 'to', 'Expected "to" in the loop.');
const end = this.parseExpression();
const body = this.parseBlock();
return { type: 'For', varName: v.value, start, end, body, line: kw.line };
}
parseFunc() {
const kw = this.next();
const name = this.expect('IDENT', undefined, 'Expected a recipe name after "recipe".');
this.expect('PUNC', '(', 'Expected "(" after the recipe name.');
const params = [];
if (!this.at('PUNC', ')')) {
params.push(this.expect('IDENT', undefined, 'Expected a parameter name.').value);
while (this.eat('PUNC', ',')) {
params.push(this.expect('IDENT', undefined, 'Expected a parameter name.').value);
}
}
this.expect('PUNC', ')', 'Expected ")" after the ingredients.');
const body = this.parseBlock();
return { type: 'FuncDecl', name: name.value, params, body, line: kw.line };
}
parseReturn() {
const kw = this.next();
let value = null;
if (this.peek().line === kw.line && !this.at('PUNC', '}') && !this.at('EOF')) {
value = this.parseExpression();
}
return { type: 'Return', value, line: kw.line };
}
parseExpression() { return this.parseOr(); }
parseOr() {
let left = this.parseAnd();
while (this.atKw('or')) {
const op = this.next();
left = { type: 'Logical', op: 'or', left, right: this.parseAnd(), line: op.line };
}
return left;
}
parseAnd() {
let left = this.parseEquality();
while (this.atKw('and')) {
const op = this.next();
left = { type: 'Logical', op: 'and', left, right: this.parseEquality(), line: op.line };
}
return left;
}
parseEquality() {
let left = this.parseComparison();
while (this.at('OP', '==') || this.at('OP', '!=')) {
const op = this.next();
left = { type: 'Binary', op: op.value, left, right: this.parseComparison(), line: op.line };
}
return left;
}
parseComparison() {
let left = this.parseTerm();
while (this.at('OP', '<') || this.at('OP', '>') || this.at('OP', '<=') || this.at('OP', '>=')) {
const op = this.next();
left = { type: 'Binary', op: op.value, left, right: this.parseTerm(), line: op.line };
}
return left;
}
parseTerm() {
let left = this.parseFactor();
while (this.at('OP', '+') || this.at('OP', '-')) {
const op = this.next();
left = { type: 'Binary', op: op.value, left, right: this.parseFactor(), line: op.line };
}
return left;
}
parseFactor() {
let left = this.parseUnary();
while (this.at('OP', '*') || this.at('OP', '/') || this.at('OP', '%')) {
const op = this.next();
left = { type: 'Binary', op: op.value, left, right: this.parseUnary(), line: op.line };
}
return left;
}
parseUnary() {
if (this.atKw('not') || this.at('OP', '-')) {
const op = this.next();
const operand = this.parseUnary();
return { type: 'Unary', op: op.value, operand, line: op.line };
}
return this.parseCall();
}
parseCall() {
let expr = this.parsePrimary();
while (this.at('PUNC', '(')) {
const lp = this.next();
const args = [];
if (!this.at('PUNC', ')')) {
args.push(this.parseExpression());
while (this.eat('PUNC', ',')) args.push(this.parseExpression());
}
this.expect('PUNC', ')', 'Expected ")" after the arguments.');
expr = { type: 'Call', callee: expr, args, line: lp.line };
}
return expr;
}
parsePrimary() {
const t = this.peek();
if (t.type === 'NUMBER') { this.next(); return { type: 'Number', value: t.value, line: t.line }; }
if (t.type === 'STRING') { this.next(); return { type: 'String', value: t.value, line: t.line }; }
if (t.type === 'IDENT') { this.next(); return { type: 'Identifier', name: t.value, line: t.line }; }
if (t.type === 'KEYWORD') {
if (t.value === 'yep') { this.next(); return { type: 'Boolean', value: true, line: t.line }; }
if (t.value === 'nah') { this.next(); return { type: 'Boolean', value: false, line: t.line }; }
if (t.value === 'nada') { this.next(); return { type: 'Null', line: t.line }; }
if (t.value === 'ask') {
this.next();
const prompt = this.parseExpression();
return { type: 'Ask', prompt, line: t.line };
}
}
if (this.at('PUNC', '(')) {
this.next();
const e = this.parseExpression();
this.expect('PUNC', ')', 'Expected ")".');
return e;
}
const found = t.type === 'EOF' ? 'the end of the file' : `"${t.value}"`;
throw new SpudError(`Unexpected ${found}. That isn't valid SpudLang.`, t.line, t.col);
}
}
/* ------------------------- INTERPRETER --------------------------------- */
class ReturnSignal { constructor(v) { this.value = v; } }
class BreakSignal {}
class ContinueSignal {}
class Env {
constructor(parent = null) { this.vars = new Map(); this.parent = parent; }
define(name, value) { this.vars.set(name, value); }
lookup(name) {
let e = this;
while (e) { if (e.vars.has(name)) return e; e = e.parent; }
return null;
}
get(name, line) {
const e = this.lookup(name);
if (!e) {
throw new SpudError(`"${name}" hasn't been planted yet. Try: spud ${name} = ...`, line);
}
return e.vars.get(name);
}
set(name, value, line) {
const e = this.lookup(name);
if (!e) {
throw new SpudError(`Can't assign to "${name}" — it doesn't exist. Plant it first with: spud ${name} = ...`, line);
}
e.vars.set(name, value);
}
}
function isTruthy(v) {
if (v === null || v === undefined || v === false) return false;
if (v === 0 || v === '') return false;
return true;
}
function typeName(v) {
if (v === null || v === undefined) return 'nada';
if (typeof v === 'number') return 'a number';
if (typeof v === 'string') return 'text';
if (typeof v === 'boolean') return 'a truth';
if (v && v.__recipe) return 'a recipe';
if (v && v.__builtin) return 'a built-in';
return 'a mystery';
}
function stringify(v) {
if (v === null || v === undefined) return 'nada';
if (typeof v === 'boolean') return v ? 'yep' : 'nah';
if (typeof v === 'number') return String(v);
if (typeof v === 'string') return v;
if (v && v.__recipe) return `<recipe ${v.name}>`;
if (v && v.__builtin) return '<built-in>';
return String(v);
}
class Interpreter {
constructor(output, requestInput) {
this.output = output;
this.requestInput = requestInput;
this.steps = 0;
this.maxSteps = 300000;
}
tick(line) {
if (++this.steps > this.maxSteps) {
throw new SpudError('Program exceeded the step limit. The potato overheated — infinite loop?', line);
}
}
async run(program, env) {
try {
await this.execBlock(program.body, env);
} catch (e) {
if (e instanceof ReturnSignal) return;
if (e instanceof BreakSignal) {
throw new SpudError('"peel" can only be used inside a loop. Nothing to peel here.', 0);
}
if (e instanceof ContinueSignal) {
throw new SpudError('"sprout" can only be used inside a loop.', 0);
}
throw e;
}
}
async execBlock(stmts, env) {
for (const s of stmts) await this.exec(s, env);
}
async exec(node, env) {
this.tick(node.line);
switch (node.type) {
case 'VarDecl': {
const v = await this.eval(node.value, env);
env.define(node.name, v);
return;
}
case 'Assign': {
const v = await this.eval(node.value, env);
env.set(node.name, v, node.line);
return;
}
case 'ExprStmt': {
await this.eval(node.expr, env);
return;
}
case 'Print': {
const parts = [];
for (const a of node.args) parts.push(stringify(await this.eval(a, env)));
this.output(parts.join(' '), 'out');
return;
}
case 'If': {
const c = await this.eval(node.cond, env);
if (isTruthy(c)) {
await this.execBlock(node.then.body, new Env(env));
} else if (node.otherwise) {
if (node.otherwise.type === 'Block') {
await this.execBlock(node.otherwise.body, new Env(env));
} else {
await this.exec(node.otherwise, env);
}
}
return;
}
case 'While': {
while (isTruthy(await this.eval(node.cond, env))) {
this.tick(node.line);
try {
await this.execBlock(node.body.body, new Env(env));
} catch (e) {
if (e instanceof BreakSignal) break;
if (e instanceof ContinueSignal) continue;
throw e;
}
}
return;
}
case 'For': {
const start = await this.eval(node.start, env);
const end = await this.eval(node.end, env);
if (typeof start !== 'number' || typeof end !== 'number') {
throw new SpudError('Loop bounds must be numbers.', node.line);
}
const step = start <= end ? 1 : -1;
for (let i = start; step > 0 ? i <= end : i >= end; i += step) {
this.tick(node.line);
const scope = new Env(env);
scope.define(node.varName, i);
try {
await this.execBlock(node.body.body, scope);
} catch (e) {
if (e instanceof BreakSignal) break;
if (e instanceof ContinueSignal) continue;
throw e;
}
}
return;
}
case 'FuncDecl': {
env.define(node.name, {
__recipe: true, name: node.name, params: node.params,
body: node.body, closure: env
});
return;
}
case 'Return': {
const v = node.value ? await this.eval(node.value, env) : null;
throw new ReturnSignal(v);
}
case 'Block': {
await this.execBlock(node.body, new Env(env));
return;
}
case 'Break': throw new BreakSignal();
case 'Continue': throw new ContinueSignal();
case 'RunMarker': return;
}
throw new SpudError('Unknown statement: ' + node.type, node.line);
}
async eval(node, env) {
this.tick(node.line);
switch (node.type) {
case 'Number': return node.value;
case 'String': return node.value;
case 'Boolean': return node.value;
case 'Null': return null;
case 'Identifier': return env.get(node.name, node.line);
case 'Ask': {