initial turing machine
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index.html
15
index.html
@ -23,6 +23,9 @@
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<br />
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📖 This page hosts strictly static content.
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<br />
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🐙 Obviously my GitHub is at
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<a href="https://github.com/Simponic">/simponic</a>.
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<br />
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🔔 My "real website" is at
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<a href="https://simponic.xyz">simponic.xyz</a>.
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</h3>
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@ -35,8 +38,8 @@
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<div class="project-body">
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<h1>Euler Golf 2</h1>
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<p>
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A puzzle game (with BFS solver) to explore rotations in the complex
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plane.
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A puzzle game (with BFS solver) to explore rotations in the
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complex plane.
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</p>
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</div>
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</a>
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@ -77,8 +80,8 @@
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<div class="project-body">
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<h1>The A-maze-ing Maize Maze</h1>
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<p>
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A Randomized Kruskal's Maze game with (more) BFS. You play
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as a 🌽corn stalk trying to become 🍿popcorn.
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A Randomized Kruskal's Maze game with (more) BFS. You play as a
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🌽corn stalk trying to become 🍿popcorn.
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</p>
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</div>
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</a>
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@ -90,9 +93,7 @@
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<div class="project-body">
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<h1>Centipede</h1>
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<p>
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Boring remake of the classic arcade game.
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</p>
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<p>Boring remake of the classic arcade game.</p>
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</div>
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</a>
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@ -1,5 +1,6 @@
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* {
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font-family: "Trebuchet MS", sans-serif;
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margin: 0;
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}
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button {
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@ -24,11 +25,15 @@ body {
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margin-left: auto;
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margin-right: auto;
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flex-direction: column;
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gap: 1rem;
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padding: 2rem;
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}
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.tape {
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border-radius: 0.25rem;
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box-shadow: 5px 5px 5px #666666;
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display: flex;
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padding: 1rem;
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@ -39,16 +44,19 @@ body {
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height: 5rem;
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max-width: 100%;
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border: 1px solid black;
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border: 2px solid white;
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overflow-x: scroll;
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overflow-y: hidden;
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}
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.cell {
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border-radius: 0.25rem;
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box-shadow: 2px 2px 5px #666666;
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background-color: #dddddd;
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position: relative;
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height: 80%;
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border: 3px solid black;
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transition: border 0.1s ease-in-out;
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transition: background 0.1s ease-in-out;
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@ -85,6 +93,40 @@ body {
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}
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.cell-input {
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border: none;
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border-radius: 0.25rem;
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background-color: 1px solid #ccc;
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width: 50px;
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margin-left: 0.25rem;
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margin-right: 0.25rem;
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text-align: center;
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font-size: 1rem;
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}
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textarea {
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border-radius: 0.25rem;
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height: 50vh;
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}
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.error {
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color: red;
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}
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.success {
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color: green;
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}
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.controls {
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display: flex;
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gap: 1rem;
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flex-direction: row;
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justify-content: center;
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align-items: center;
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}
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hr {
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border-top: 2px solid black;
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border-bottom: none;
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}
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@ -7,8 +7,23 @@
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<body>
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<div class="container">
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<h1>Simponic's State System</h1>
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<p>Author: Elizabeth Hunt</p>
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<hr>
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<p id="turing_state">State: _</p>
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<div id="tape" class="tape"></div>
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<div class="controls" id="controls" style="display: none">
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<button id="next_step">Next Step</button> <button id=
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"toggle_play">🔁 Begin</button> <button id=
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"reset">Reset</button><br>
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</div>
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<textarea id="instructions">test</textarea>
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<div>
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<button id="compile">Compile</button><span style=
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"margin-left: 0.5rem" id="compile_status"></span>
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</div>
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</div>
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<script src="js/observable.js"></script>
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<script src="js/turing_machine.js"></script>
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<script src="js/main.js"></script>
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</body>
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</html>
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@ -1,51 +1,24 @@
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const DISPLAY_CELLS = 15;
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const TAPE_LEN = 200;
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const MESSAGES = {
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SET_CELL: "SET_CELL",
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PAUSE: "PAUSE",
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SIMULATE: "SIMULATE",
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SET_READER: "SET_READER",
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NEXT_STEP: "NEXT_STEP",
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COMPILE: "COMPILE",
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COMPILE_STATUS: "COMPILE_STATUS",
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NEW_TURING_STATE: "NEW_TURING_STATE",
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};
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class Observable {
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constructor() {
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this.observers = [];
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}
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subscribe(f) {
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this.observers.push(f);
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}
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unsubscribe(f) {
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this.observers = this.observers.filter((subscriber) => subscriber !== f);
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}
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notify(data) {
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this.observers.forEach((observer) => observer(data));
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}
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}
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const state = new Observable();
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const tape = Array(TAPE_LEN).fill(0);
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state.subscribe((msg) => {
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if (msg.type == MESSAGES.SET_CELL) {
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tape[msg.cellId] = msg.value;
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}
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});
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const tapeEl = document.getElementById("tape");
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const inputCellId = (cellId) => `${cellId}-input`;
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const updateCellButtonId = (cellId) => `${cellId}-button-update`;
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const setCellFromInput = (cellId, inputId) => {
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const input = document.getElementById(inputId);
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tape[cellId] = input.value;
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};
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const cell = (cellId, initValue = 0) => {
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const cell = (cellId, initValue = "NULL") => {
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const cellDiv = document.createElement("div");
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cellDiv.classList.add("cell");
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cellDiv.id = cellId;
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@ -85,14 +58,203 @@ const cell = (cellId, initValue = 0) => {
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return cellDiv;
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};
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const parseRules = (rules, beginState) => {
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const quadruples = rules.split("\n");
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const instructions = [];
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quadruples.forEach((quadruple, line) => {
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const commentLess = quadruple.replaceAll(/\/\/.*/g, "").trim();
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if (!commentLess) {
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return;
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}
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const items = commentLess
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.split(" ")
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.map((x) => x.trim())
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.filter((x) => x);
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if (items.length != 4) {
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throw new Error(`Invalid instruction on line ${line}`);
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}
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instructions.push(items);
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});
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if (!instructions.some(([fromState]) => fromState == beginState)) {
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throw new Error(
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`At least one instruction must begin from state: ${beginState}`
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);
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}
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return instructions;
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};
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// --
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const tapeEl = document.getElementById("tape");
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const compileButton = document.getElementById("compile");
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const instructionsEl = document.getElementById("instructions");
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const controlsEl = document.getElementById("controls");
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const nextStepButton = document.getElementById("next_step");
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const togglePlayButton = document.getElementById("toggle_play");
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const compileStatusEl = document.getElementById("compile_status");
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const turingMachineStateEl = document.getElementById("turing_state");
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const resetButton = document.getElementById("reset");
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resetButton.addEventListener("click", () => {
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state.notify({ type: MESSAGES.PAUSE });
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state.notify({ type: MESSAGES.COMPILE, value: instructionsEl.value });
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});
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compileButton.addEventListener("click", () => {
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state.notify({ type: MESSAGES.COMPILE, value: instructionsEl.value });
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});
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nextStepButton.addEventListener("click", () => {
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state.notify({ type: MESSAGES.PAUSE });
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state.notify({ type: MESSAGES.NEXT_STEP });
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});
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let playButton_simulationStatus = "paused";
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togglePlayButton.addEventListener("click", function () {
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if (playButton_simulationStatus == "paused") {
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state.notify({ type: MESSAGES.SIMULATE });
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} else if (playButton_simulationStatus == "simulate") {
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state.notify({ type: MESSAGES.PAUSE });
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}
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});
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state.subscribe((msg) => {
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if (msg.type == MESSAGES.COMPILE_STATUS) {
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const { error, success } = msg;
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if (error) {
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compileStatusEl.classList.remove("success");
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compileStatusEl.classList.add("error");
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compileStatusEl.innerHTML = error;
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}
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if (success) {
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compileStatusEl.classList.add("success");
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compileStatusEl.classList.remove("error");
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compileStatusEl.innerHTML = `Successful compile at ${new Date().toLocaleString()}!`;
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}
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}
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});
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state.subscribe((msg) => {
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if (msg.type == MESSAGES.COMPILE_STATUS) {
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const { error, success } = msg;
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if (error) {
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controlsEl.style.display = "none";
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} else if (success) {
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controlsEl.style.display = "block";
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}
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}
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});
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state.subscribe((msg) => {
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if (msg.type == MESSAGES.PAUSE) {
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togglePlayButton.innerHTML = "🔁 Begin";
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playButton_simulationStatus = "paused";
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}
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if (msg.type == MESSAGES.SIMULATE) {
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togglePlayButton.innerHTML = "⏸️ Pause";
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playButton_simulationStatus = "simulate";
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}
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});
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state.subscribe((msg) => {
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if (msg.type == MESSAGES.NEW_TURING_STATE) {
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turingMachineStateEl.innerHTML = msg.value;
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}
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});
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// -
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const main = () => {
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const cells = tape.map((_, cellId) => cell(cellId));
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const blank = "B";
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const beginState = "q0";
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const acceptState = "f";
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const tape = Array(200).fill(blank);
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const cells = tape.map((_, cellId) => cell(cellId, blank));
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for (const cell of cells) {
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tapeEl.appendChild(cell);
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}
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let turingMachine;
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state.subscribe((msg) => {
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if (msg.type == MESSAGES.SET_CELL) {
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const { value, cell } = msg;
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tape[cell] = value;
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if (turingMachine) turingMachine.setTapeAtCell(cell, value);
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}
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if (msg.type == MESSAGES.COMPILE) {
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const { value } = msg;
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try {
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const rules = parseRules(value, beginState, acceptState);
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turingMachine = new TuringMachine(
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[...tape],
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rules,
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beginState,
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blank,
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acceptState
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);
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state.notify({ type: MESSAGES.SET_READER, cell: 0 });
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setTimeout(() => {}, 1000);
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state.notify({
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type: MESSAGES.NEW_TURING_STATE,
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value: turingMachine.getStateStatus(),
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});
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state.notify({ type: MESSAGES.COMPILE_STATUS, success: true });
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} catch (e) {
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state.notify({ type: MESSAGES.COMPILE_STATUS, error: e.toString() });
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}
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}
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if (msg.type == MESSAGES.SIMULATE) {
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const interval = setInterval(() => {
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state.notify({ type: MESSAGES.NEXT_STEP });
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}, 300);
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const subscriptionFn = (msg) => {
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if (msg.type == MESSAGES.PAUSE) {
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clearInterval(interval);
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state.unsubscribe(subscriptionFn);
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}
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};
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state.subscribe(subscriptionFn);
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}
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if (msg.type == MESSAGES.NEXT_STEP && turingMachine) {
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const step = turingMachine.step();
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const status = turingMachine.getStateStatus();
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const cell = turingMachine.getHead();
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if (!step) {
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const accepting = turingMachine.isAccepting();
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state.notify({
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type: MESSAGES.NEW_TURING_STATE,
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value: accepting
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? `<span class='success'>Accept(${status})</span>`
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: `<span class='error'>Fail(${status}}</span>`,
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});
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} else {
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state.notify({
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type: MESSAGES.NEW_TURING_STATE,
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value: status,
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});
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}
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state.notify({
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type: MESSAGES.SET_READER,
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cell,
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});
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state.notify({
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type: MESSAGES.SET_CELL,
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cell,
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value: turingMachine.getTapeAtCell(cell),
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});
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if (!step)
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state.notify({
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type: MESSAGES.PAUSE,
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});
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}
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});
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};
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main();
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14
turing-machine/js/observable.js
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14
turing-machine/js/observable.js
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@ -0,0 +1,14 @@
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class Observable {
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constructor() {
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this.observers = [];
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}
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subscribe(f) {
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this.observers.push(f);
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}
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unsubscribe(f) {
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this.observers = this.observers.filter((subscriber) => subscriber !== f);
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}
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notify(data) {
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this.observers.forEach((observer) => observer(data));
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}
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}
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82
turing-machine/js/turing_machine.js
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82
turing-machine/js/turing_machine.js
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@ -0,0 +1,82 @@
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class TuringMachine {
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constructor(
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tape = [],
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rules = [],
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initialState = "q0",
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blankSymbol = "B",
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acceptState = "f"
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) {
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this.tape = tape;
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this.rules = this.parseRules(rules);
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this.state = initialState;
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this.head = 0;
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this.blankSymbol = blankSymbol;
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this.acceptState = acceptState;
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this.iteration = 0;
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}
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getStateStatus() {
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return `State: ${this.state}, Step: ${this.iteration}`;
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}
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getHead() {
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return this.head;
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}
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getState() {
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return this.state;
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}
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getTapeAtCell(idx) {
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return this.tape[idx];
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}
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setTapeAtCell(idx, val) {
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this.tape[idx] = val;
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}
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isAccepting() {
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return this.state == this.acceptState;
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}
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parseRules(rules) {
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const parsedRules = {};
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for (const [currentState, readSymbol, action, newState] of rules) {
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const key = `${currentState},${readSymbol}`;
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const value = `${newState},${action}`;
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parsedRules[key] = value;
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}
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return parsedRules;
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}
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step() {
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const currentSymbol = this.tape[this.head] || this.blankSymbol;
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const key = `${this.state},${currentSymbol}`;
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if (!(key in this.rules)) {
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return false;
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}
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const rule = this.rules[key];
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const [newState, action] = rule.split(",");
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this.state = newState;
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if (action === "R") {
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this.head += 1;
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} else if (action === "L") {
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this.head -= 1;
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} else {
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this.tape[this.head] = action;
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}
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if (this.isAccepting()) {
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return false;
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}
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if (this.head >= 0 && this.head < this.tape.length) {
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this.iteration++;
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return true;
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}
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return false;
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}
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}
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