One-File-Tools/tools/visual-turing-machine.html at main · praveenscience/One-File-Tools · GitHub

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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>Visual Turing Machine Simulator — One File Tools</title>
    <style>
      :root {
        --app-bg: #0d1117;
        --app-text: #c9d1d9;
        --app-primary: #58a6ff;
        --app-primary-hover: #79c0ff;
        --app-secondary: #21262d;
        --app-panel: #161b22;
        --app-border: #30363d;
        --accent-green: #2ea043;
        --accent-red: #da3633;
        --tape-bg: #f0f6fc;
        --tape-text: #24292f;
      }

      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }

      body {
        font-family:
          "Inter",
          -apple-system,
          sans-serif;
        background-color: var(--app-bg);
        color: var(--app-text);
        padding: 2rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        min-height: 100vh;
      }

      header {
        text-align: center;
        margin-bottom: 2rem;
      }
      h1 {
        color: var(--app-primary);
        font-size: 2rem;
        margin-bottom: 0.5rem;
      }

      main {
        display: flex;
        flex-direction: column;
        gap: 2rem;
        width: 100%;
        max-width: 1000px;
      }

      .panel {
        background: var(--app-panel);
        border: 1px solid var(--app-border);
        border-radius: 12px;
        padding: 1.5rem;
        display: flex;
        flex-direction: column;
        gap: 1rem;
      }

      /* Tape Visualization */
      .tape-container {
        display: flex;
        justify-content: center;
        overflow: hidden;
        padding: 1rem 0;
        position: relative;
        background: var(--app-secondary);
        border-radius: 8px;
        border: 1px solid var(--app-border);
      }

      .tape {
        display: flex;
        transition: transform 0.3s ease;
      }

      .cell {
        width: 50px;
        height: 50px;
        background: var(--tape-bg);
        color: var(--tape-text);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        font-weight: bold;
        border: 2px solid #ccc;
        margin: 0 2px;
        border-radius: 4px;
      }

      .head-pointer {
        position: absolute;
        top: 80px;
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 0;
        border-left: 15px solid transparent;
        border-right: 15px solid transparent;
        border-bottom: 20px solid var(--accent-red);
      }

      /* State & Code blocks */
      .editor-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
      }

      @media (max-width: 768px) {
        .editor-grid {
          grid-template-columns: 1fr;
        }
      }

      textarea {
        width: 100%;
        height: 250px;
        background: var(--app-bg);
        color: var(--app-text);
        border: 1px solid var(--app-border);
        border-radius: 6px;
        padding: 1rem;
        font-family: monospace;
        resize: vertical;
      }

      .controls {
        display: flex;
        gap: 1rem;
        align-items: center;
        flex-wrap: wrap;
      }

      button {
        background: var(--app-primary);
        color: #000;
        border: none;
        padding: 0.5rem 1rem;
        border-radius: 6px;
        font-weight: bold;
        cursor: pointer;
        transition: all 0.2s;
      }
      button:hover {
        background: var(--app-primary-hover);
      }
      .btn-danger {
        background: var(--accent-red);
        color: white;
      }
      .btn-success {
        background: var(--accent-green);
        color: white;
      }

      .status-bar {
        display: flex;
        justify-content: space-between;
        background: var(--app-secondary);
        padding: 1rem;
        border-radius: 8px;
        font-family: monospace;
        font-size: 1.1rem;
      }
      .state-badge {
        color: var(--app-primary);
        font-weight: bold;
      }
    </style>
  </head>
  <body>
    <header>
      <h1>Visual Turing Machine Simulator</h1>
      <p>A compiler and visualization engine for Turing Machine rules (State / Read / Write / Move / Next).</p>
    </header>

    <main>
      <!-- Tape Display -->
      <div class="panel">
        <h2 style="font-size: 1.2rem; color: var(--app-primary)">Turing Tape</h2>
        <div style="display: flex; gap: 1rem">
          <input type="text" id="initialInput" placeholder="Initial Tape Input (e.g. 1101)" style="flex: 1; padding: 0.5rem; border-radius: 4px; border: 1px solid var(--app-border); background: var(--app-bg); color: white" />
          <button id="btnLoad">Load Tape</button>
        </div>

        <div class="tape-container">
          <div class="tape" id="tapeView"></div>
          <div class="head-pointer"></div>
        </div>

        <div class="status-bar">
          <span>Current State: <span class="state-badge" id="lblState">q0</span></span>
          <span>Steps: <span id="lblSteps">0</span></span>
          <span id="lblStatus" style="color: #8b949e">Idle</span>
        </div>

        <div class="controls">
          <button id="btnStep">Step >|</button>
          <button id="btnRun" class="btn-success">Run >></button>
          <button id="btnPause" class="btn-danger">Pause ||</button>
          <button id="btnReset">Reset</button>
          <label style="margin-left: auto"> Speed (ms): <input type="number" id="runSpeed" value="200" style="width: 80px; padding: 0.2rem" /> </label>
        </div>
      </div>

      <!-- Editor Panel -->
      <div class="panel">
        <div class="editor-grid">
          <div>
            <h2 style="font-size: 1.2rem; color: var(--app-primary); margin-bottom: 0.5rem">State Transition Rules</h2>
            <p style="font-size: 0.85rem; color: #8b949e; margin-bottom: 0.5rem">Format: <code>CurrentState ReadSymbol WriteSymbol Direction NextState</code>. Use <code>_</code> for blank.</p>
            <textarea id="codeEditor">
// Example: Invert binary string
q0 0 1 R q0
q0 1 0 R q0
q0 _ _ L halt
            </textarea>
          </div>
          <div>
            <h2 style="font-size: 1.2rem; color: var(--app-primary); margin-bottom: 0.5rem">How to write rules</h2>
            <div style="background: var(--app-bg); padding: 1rem; border-radius: 6px; font-size: 0.9rem; border: 1px solid var(--app-border); height: 250px; overflow-y: auto">
              <p>The machine consists of an infinite tape and a read/write head.</p>
              <br />
              <strong>Syntax:</strong>
              <pre style="color: var(--accent-green)">State  Read  Write  Dir  NextState</pre>
              <ul>
                <li><strong>State:</strong> Arbitrary string (start is always 'q0')</li>
                <li><strong>Read:</strong> Symbol on tape under head</li>
                <li><strong>Write:</strong> Symbol to write to tape</li>
                <li><strong>Dir:</strong> 'L' (Left), 'R' (Right), or '*' (Stay)</li>
                <li><strong>NextState:</strong> The state to transition to (use 'halt' to stop)</li>
                <li><strong>Blank Symbol:</strong> '_' represents empty tape</li>
              </ul>
            </div>
          </div>
        </div>
      </div>
    </main>

    <script>
      const tapeView = document.getElementById("tapeView");
      const lblState = document.getElementById("lblState");
      const lblSteps = document.getElementById("lblSteps");
      const lblStatus = document.getElementById("lblStatus");

      const inputTape = document.getElementById("initialInput");
      const codeEditor = document.getElementById("codeEditor");
      const runSpeed = document.getElementById("runSpeed");

      // Machine State
      let tape = {};
      let headPos = 0;
      let currentState = "q0";
      let steps = 0;
      let isRunning = false;
      let runInterval = null;
      let compiledRules = {};

      // Initialize tape
      function loadTape() {
        tape = {};
        const str = inputTape.value || "";
        for (let i = 0; i < str.length; i++) {
          tape[i] = str[i];
        }
        headPos = 0;
        currentState = "q0";
        steps = 0;
        lblStatus.textContent = "Loaded";
        lblStatus.style.color = "#8b949e";
        compileRules();
        updateUI();
      }

      function compileRules() {
        compiledRules = {};
        const lines = codeEditor.value.split("\n");
        lines.forEach((line) => {
          const trimmed = line.trim();
          if (!trimmed || trimmed.startsWith("//")) return;
          const parts = trimmed.split(/\s+/);
          if (parts.length === 5) {
            const [state, read, write, dir, next] = parts;
            if (!compiledRules[state]) compiledRules[state] = {};
            compiledRules[state][read] = { write, dir, next };
          }
        });
      }

      function updateUI() {
        lblState.textContent = currentState;
        lblSteps.textContent = steps;

        // Render visible tape (headPos - 5 to headPos + 5)
        tapeView.innerHTML = "";
        const VISIBLE_RADIUS = 7;

        for (let i = headPos - VISIBLE_RADIUS; i <= headPos + VISIBLE_RADIUS; i++) {
          const cell = document.createElement("div");
          cell.className = "cell";
          cell.textContent = tape[i] && tape[i] !== "_" ? tape[i] : "";
          tapeView.appendChild(cell);
        }
      }

      function step() {
        if (currentState === "halt" || currentState.toLowerCase().includes("halt")) {
          pause();
          lblStatus.textContent = "Halted";
          lblStatus.style.color = "var(--accent-green)";
          return false;
        }

        const readSymbol = tape[headPos] || "_";
        const rulesForState = compiledRules[currentState];

        if (!rulesForState) {
          pause();
          lblStatus.textContent = `Error: No rules for state '${currentState}'`;
          lblStatus.style.color = "var(--accent-red)";
          return false;
        }

        const rule = rulesForState[readSymbol];
        if (!rule) {
          pause();
          lblStatus.textContent = `Error: No rule for state '${currentState}' reading '${readSymbol}'`;
          lblStatus.style.color = "var(--accent-red)";
          return false;
        }

        // Apply rule
        if (rule.write !== "_") {
          tape[headPos] = rule.write;
        } else {
          delete tape[headPos];
        }

        if (rule.dir === "R") headPos++;
        else if (rule.dir === "L") headPos--;

        currentState = rule.next;
        steps++;

        updateUI();
        lblStatus.textContent = "Running...";
        lblStatus.style.color = "var(--app-primary)";
        return true;
      }

      function run() {
        if (isRunning) return;
        isRunning = true;
        const speed = Math.max(10, parseInt(runSpeed.value) || 200);
        runInterval = setInterval(() => {
          if (!step()) pause();
        }, speed);
      }

      function pause() {
        isRunning = false;
        clearInterval(runInterval);
        if (lblStatus.textContent === "Running...") {
          lblStatus.textContent = "Paused";
          lblStatus.style.color = "#8b949e";
        }
      }

      document.getElementById("btnLoad").addEventListener("click", loadTape);
      document.getElementById("btnStep").addEventListener("click", () => {
        pause();
        step();
      });
      document.getElementById("btnRun").addEventListener("click", run);
      document.getElementById("btnPause").addEventListener("click", pause);
      document.getElementById("btnReset").addEventListener("click", () => {
        pause();
        loadTape();
      });

      // Init
      inputTape.value = "10110";
      loadTape();
    </script>
  </body>
</html>