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2.8 KiB
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51 lines
No EOL
2.8 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>machine — Ludic</title>
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<meta name="description" content="An explicit state machine over an int var — dispatches on the store's value.">
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<link rel="stylesheet" href="base.css">
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<link rel="stylesheet" href="docs.css">
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</head>
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<body>
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<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>
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<main class="wrap item">
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<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">machine</span></div>
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<div class="item-head">
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<span class="kind-badge kind-keyword">keyword</span>
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<h1 id="top">machine</h1>
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</div>
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<code class="sig">machine store { state Name { … } }</code>
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<div class="desc"><p>A <code>machine</code> turns an integer store into an explicit state machine, replacing brittle <code>if phase == N</code> chains. It reads the store — a named program-scope <code>var</code> is the modern choice — and dispatches to the matching <code>state</code> block; inside a state, <code>become Name</code> transitions to another state of the same machine. States number themselves by declaration order (the first is <code>0</code>, the next <code>1</code>, and so on), so you never write magic constants, though <code>state Name = expr</code> is accepted when a state needs a specific value. Because <code>become</code> compiles to a single store back into the <code>var</code>, the whole machine lowers to plain branches with no dispatch table. Place a <code>machine</code> inside a handler so it runs each frame.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program TurnOrder {
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enum Phase { KnightMenu, KnightResolve, EnemyTurn }
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var battle_phase: int = Phase.KnightMenu
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handler RunTurn phase Update {
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machine battle_phase {
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state KnightMenu {
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if Input.key() == ' ' { become KnightResolve }
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}
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state KnightResolve {
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become EnemyTurn
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}
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state EnemyTurn {
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become KnightMenu
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}
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}
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}
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handler DrawWorld phase Render {
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Screen.clear(Color.MidnightBlue)
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Screen.draw_number(x: 8, y: 8, value: battle_phase, color: Color.Gold, scale: 2)
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Screen.show()
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}
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}</pre></div>
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<a class="back" href="api.html">← All symbols</a>
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</main>
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<script src="ludic-highlight.js"></script>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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</body></html> |