47 lines
No EOL
2.6 KiB
HTML
47 lines
No EOL
2.6 KiB
HTML
<!doctype html>
|
||
<html lang="en">
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
<title>state — Ludic</title>
|
||
<meta name="description" content="One state of a machine — its body runs while the machine sits in it.">
|
||
<link rel="stylesheet" href="base.css">
|
||
<link rel="stylesheet" href="docs.css">
|
||
</head>
|
||
<body>
|
||
<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
|
||
<main class="wrap item">
|
||
<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#control">Control flow</a> <span>›</span> <span class="here">state</span></div>
|
||
<div class="item-head">
|
||
<span class="kind-badge kind-keyword">keyword</span>
|
||
<h1 id="top">state</h1>
|
||
</div>
|
||
<code class="sig">state Name { … }</code>
|
||
<div class="desc"><p>A <code>state</code> declares one state of an enclosing <code>machine</code>: a named block whose body runs while the machine's store holds that state's value. States take their value from declaration order — the first <code>state</code> is <code>0</code>, the next <code>1</code>, and so on — so you refer to them by name and never track the numbers yourself (write <code>state Name = expr</code> only when a state must have a specific value). From inside a state, <code>become OtherName</code> transitions the machine by storing the target state's value back into the store. Keep each state focused on the logic for that mode and hand off with <code>become</code> when its condition to move on is met.</p></div>
|
||
|
||
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program DoorControl {
|
||
enum DoorState { Closed, Opening, Open }
|
||
var door: int = DoorState.Closed
|
||
var elapsed_frames: int = 0
|
||
|
||
handler RunDoor phase Update {
|
||
machine door {
|
||
state Closed {
|
||
if Input.key() == ' ' { elapsed_frames = 0; become Opening }
|
||
}
|
||
state Opening {
|
||
elapsed_frames = elapsed_frames + 1
|
||
if elapsed_frames >= 30 { become Open }
|
||
}
|
||
state Open {
|
||
Screen.status("door open")
|
||
}
|
||
}
|
||
}
|
||
}</pre></div>
|
||
|
||
<a class="back" href="api.html">← All symbols</a>
|
||
</main>
|
||
<script src="ludic-highlight.js"></script>
|
||
<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
|
||
</body></html> |