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July 19, 2018 19:35
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Modilar SNISP stack snippet (https://codegolf.stackexchange.com/questions/168906/)
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| <html> | |
| <head> | |
| <link href="main.css" rel="stylesheet" type="text/css"> | |
| </head> | |
| <body> | |
| <b>Code:</b> | |
| <br/> | |
| <textarea id="code" width="300" height="300"></textarea> | |
| <br/> | |
| <button id="run-button" onclick="run()">Run</button> | |
| <button id="stop-button" onclick="stop()" style="display: none;">Stop</button> | |
| <br/> | |
| <div id="execution-display"></div> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| #code { | |
| font-family: monospace; | |
| } | |
| #execution-display { | |
| font-family: monospace; | |
| white-space: pre; | |
| } | |
| .highlight { | |
| background-color: yellow; | |
| } |
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| let TICKS_PER_SECOND = 5; | |
| let INTERVAL_MS = 1000 / TICKS_PER_SECOND; | |
| let runButton = document.getElementById("run-button"); | |
| let stopButton = document.getElementById("stop-button"); | |
| let code = document.getElementById("code"); | |
| let executionArea = document.getElementById("execution-display"); | |
| let intervalId; | |
| function htmlEscape(string) { | |
| let node = document.createElement("span"); | |
| node.innerText = string; | |
| return node.innerHTML; | |
| } | |
| let snisp = { | |
| x: null, | |
| y: null, | |
| direction: null, | |
| callStack: null, | |
| stopped: null, | |
| playfield: null, | |
| padRows: function() { | |
| let maxLength = Math.max(...this.playfield.map(e => e.length)); | |
| for (let i = 0; i < this.playfield.length; i++) { | |
| this.playfield[i] = this.playfield[i].padEnd(maxLength, "."); | |
| } | |
| }, | |
| initialize: function() { | |
| this.x = 0; | |
| this.y = 0; | |
| this.direction = "right"; | |
| this.callStack = []; | |
| this.stopped = false; | |
| this.playfield = code.value.split("\n"); | |
| this.padRows(); | |
| this.update(); | |
| }, | |
| getCurrentChar: function() { | |
| let row = this.playfield[this.y]; | |
| if (row == undefined) return; | |
| return row[this.x]; | |
| }, | |
| backslashMirror: function() { | |
| let table = { | |
| "up": "left", | |
| "right": "down", | |
| "down": "right", | |
| "left": "up", | |
| }; | |
| this.direction = table[this.direction]; | |
| }, | |
| slashMirror: function() { | |
| let table = { | |
| "up": "right", | |
| "right": "up", | |
| "down": "left", | |
| "left": "down", | |
| }; | |
| this.direction = table[this.direction]; | |
| }, | |
| forward: function() { | |
| switch (this.direction) { | |
| case "up": | |
| this.y -= 1; | |
| break; | |
| case "down": | |
| this.y += 1; | |
| break; | |
| case "left": | |
| this.x -= 1; | |
| break; | |
| case "right": | |
| this.x += 1; | |
| break; | |
| default: | |
| throw "direction is invalid"; | |
| } | |
| }, | |
| pushState: function() { | |
| this.callStack.push({ | |
| x: this.x, | |
| y: this.y, | |
| direction: this.direction, | |
| }); | |
| }, | |
| restoreState: function() { | |
| let state = this.callStack.pop(); | |
| if (state == undefined) { | |
| this.stopped = true; | |
| return; | |
| } | |
| this.x = state.x; | |
| this.y = state.y; | |
| this.direction = state.direction; | |
| }, | |
| tick: function() { | |
| if (this.stopped) return; | |
| let currentChar = this.getCurrentChar(); | |
| if (currentChar == undefined) { | |
| this.stopped = true; | |
| return; | |
| } | |
| switch (currentChar) { | |
| case "\\": | |
| this.backslashMirror(); | |
| break; | |
| case "/": | |
| this.slashMirror(); | |
| break; | |
| case "!": | |
| this.forward(); | |
| break; | |
| case "@": | |
| this.pushState(); | |
| break; | |
| case "#": | |
| this.restoreState(); | |
| this.forward(); | |
| break; | |
| default: | |
| break; | |
| } | |
| this.forward(); | |
| }, | |
| generatePlayfieldHTML: function(stateX, stateY) { | |
| let playfieldLines = []; | |
| for (let y = 0; y < this.playfield.length; y++) { | |
| let chars = []; | |
| let row = this.playfield[y]; | |
| for (let x = 0; x < row.length; x++) { | |
| let c = htmlEscape(row[x]); | |
| if (x == stateX && y == stateY) { | |
| c = '<span class="highlight">' + c + '</span>'; | |
| } | |
| chars.push(c); | |
| } | |
| playfieldLines.push(chars.join("")); | |
| } | |
| return playfieldLines.join("<br>"); | |
| }, | |
| update: function() { | |
| let playfields = []; | |
| for (let i = 0; i < this.callStack.length; i++) { | |
| let state = this.callStack[i]; | |
| playfields.push(this.generatePlayfieldHTML(state.x, state.y)); | |
| } | |
| playfields.push(this.generatePlayfieldHTML(this.x, this.y)); | |
| let playfieldHTML = playfields.join("<br><br>"); | |
| executionArea.innerHTML = playfieldHTML; | |
| }, | |
| }; | |
| function tick() { | |
| snisp.tick(); | |
| snisp.update(); | |
| } | |
| function run() { | |
| runButton.style.display = "none"; | |
| stopButton.style.display = ""; | |
| code.style.display = "none"; | |
| executionArea.style.display = ""; | |
| snisp.initialize(); | |
| intervalId = setInterval(tick, INTERVAL_MS); | |
| } | |
| function stop() { | |
| runButton.style.display = ""; | |
| stopButton.style.display = "none"; | |
| code.style.display = ""; | |
| executionArea.style.display = "none"; | |
| clearInterval(intervalId); | |
| } |
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