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Diffstat (limited to 'html/playground')
| -rw-r--r-- | html/playground/scheme.html | 476 |
1 files changed, 476 insertions, 0 deletions
diff --git a/html/playground/scheme.html b/html/playground/scheme.html new file mode 100644 index 0000000..fc2d5fa --- /dev/null +++ b/html/playground/scheme.html @@ -0,0 +1,476 @@ +<html lang="en"><head> + <meta charset="UTF-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <title>JavaScript Playground</title> + <meta name="description" content="A JavaScript jungle-gym for doing experiments and sharing scrappy fiddles."> + <style> + body { + display: flex; + flex-direction: column; + align-items: center; + background-color: #ddd; + padding: 10px; + height: 100vh; + margin: 0; + } + + textarea { + width: 100%; + height: 64%; + font-family: monospace; + background-color: #FFFEEC; + border: 2px solid #000; + scrollbar-width: none; + font-size: 1rem; + margin-bottom: 10px; + padding: 10px; + box-sizing: border-box; + resize: none; + border-bottom: 12px solid teal; + -webkit-user-modify: read-write-plaintext-only; + } + + textarea::-webkit-scrollbar { + display: none; + } + + textarea::selection { + background-color: #EFECA7; + } + + textarea:focus { + outline: none; + } + + #console { + width: 100%; + height: 22%; + background-color: #000; + color: #0fc; + font-family: monospace; + font-size: 1rem; + overflow-y: auto; + padding: 10px; + box-sizing: border-box; + white-space: pre-wrap; + } + + .button-container { + width: 100%; + display: flex; + justify-content: flex-end; + margin-bottom: 10px; + } + + button { + padding: 10px 20px; + font-size: 1rem; + margin-left: 10px; + cursor: pointer; + border: none; + transition: background-color 0.3s ease; + } + + button:hover, button:focus { + outline: none; + } + + button.run { + background-color: teal; + color: #FFFFFF; + } + </style> +</head> +<body> + + <div class="playground" id="playground"> + <div class="seesaw" id="seesaw"></div> + <div class="slide" id="slide"></div> + </div> + + <div class="button-container"> + <button onclick="clearEverything()">Clear</button> + <button onclick="downloadCodeAndEditor()">Download</button> + <button onclick="shareCode()">Share</button> + <button onclick="evaluateCode()" class="run">Run Code</button> + </div> + <textarea id="codeInput">function tokenizeScheme(input) { + const tokens = []; + let current = 0; + + const isWhitespace = (char) => /\s/.test(char); + const isDigit = (char) => /[0-9]/.test(char); + const isParen = (char) => char === '(' || char === ')'; + // Symbols can include letters, numbers, and some punctuation like - _ ! ? + const isSymbolChar = (char) => /[a-zA-Z0-9\+\-\*\/\=\?\!\_]/.test(char); + + while (current < input.length) { + let char = input[current]; + + if (isWhitespace(char)) { + current++; + continue; + } + + if (isParen(char)) { + tokens.push({ type: 'paren', value: char }); + current++; + continue; + } + + if (isDigit(char) || (char === '-' && isDigit(input[current + 1]))) { + let number = ''; + while (isDigit(char) || char === '-') { + number += char; + char = input[++current]; + } + tokens.push({ type: 'number', value: number }); + continue; + } + + // Handle symbols, including letters, numbers, punctuation + if (isSymbolChar(char)) { + let symbol = ''; + while (isSymbolChar(char)) { + symbol += char; + char = input[++current]; + } + tokens.push({ type: 'symbol', value: symbol }); + continue; + } + + throw new Error(`Unexpected character: ${char}`); + } + + return tokens; +} + + +function parseScheme(tokens) { + let current = 0; + + function walk() { + let token = tokens[current]; + + if (token.type === 'number') { + current++; + return { type: 'NumberLiteral', value: Number(token.value) }; + } + + if (token.type === 'symbol') { + current++; + return { type: 'Symbol', value: token.value }; + } + + if (token.type === 'paren' && token.value === '(') { + current++; + const node = { type: 'List', value: [] }; + + while (!(tokens[current].type === 'paren' && tokens[current].value === ')')) { + node.value.push(walk()); + } + + current++; // Skip closing ')' + return node; + } + + throw new Error(`Unexpected token: ${token.type}`); + } + + return walk(); +} + +const globalEnv = { + '+': (...args) => args.reduce((acc, curr) => acc + curr), + '-': (...args) => args.reduce((acc, curr) => acc - curr), + '*': (...args) => args.reduce((acc, curr) => acc * curr), + '/': (a, b) => a / b, // Only two arguments for division...right? + 'eq?': (...args) => args.every((val, i, arr) => val === arr[0]), + 'car': (list) => list[0], + 'cdr': (list) => list.slice(1), + 'cons': (a, b) => [a].concat(b), + 'null?': (list) => list.length === 0, +}; + +function evaluate(node, env = globalEnv) { + if (node.type === 'NumberLiteral') { + return node.value; + } + + if (node.type === 'Symbol') { + if (env[node.value] !== undefined) { + return env[node.value]; + } + throw new Error(`Undefined symbol: ${node.value}`); + } + + if (node.type === 'List') { + const [first, ...rest] = node.value; + + // Is the first element a symbol, like an operator or function name? + if (first.type === 'Symbol') { + const operator = first.value; + + // Special case for define + if (operator === 'define') { + const [symbol, expr] = rest; + env[symbol.value] = evaluate(expr, env); + return; + } + + // Special case for lambda + if (operator === 'lambda') { + const [params, body] = rest; + + // Create a closure to return + return function (...args) { + const lambdaEnv = { ...env }; + + // Bind each argument to the corresponding parameter... + params.value.forEach((param, i) => { + lambdaEnv[param.value] = args[i]; + }); + + // ...and then evaluate the body with the environment + return evaluate(body, lambdaEnv); + }; + } + + // Special case for if + if (operator === 'if') { + const [test, consequent, alternate] = rest; + const condition = evaluate(test, env); + return condition ? evaluate(consequent, env) : evaluate(alternate, env); + } + } + + // Evaluate the first element + const func = evaluate(first, env); + + // Check that `func` is a function. If it isn't, don't try to apply it + if (typeof func !== 'function') { + throw new Error(`Expected a function but got: ${func}`); + } + + const args = rest.map(arg => evaluate(arg, env)); + return func(...args); + } + + throw new Error(`Unexpected node type: ${node.type}`); +} + +function evalScheme(input) { + const tokens = tokenizeScheme(input); + const ast = parseScheme(tokens); + return evaluate(ast); +} + +/* +console.log(evalScheme("(define add1 (lambda (x) (+ x 1)))")); +console.log(evalScheme("(add1 10)")); +console.log(evalScheme("(eq? 1 1)")); +console.log(evalScheme("(eq? 1 2)")); +console.log(evalScheme("(+ 1 2 3 6)")); +*/ + +function mountRepl(playground) { + // Create a REPL container + const replContainer = document.createElement('div'); + replContainer.style.display = 'flex'; + replContainer.style.flexDirection = 'column'; + replContainer.style.width = '100%'; + + // Create an input field for the Scheme expressions + const input = document.createElement('textarea'); + input.placeholder = "Scheme here..."; + input.style.width = '100%'; + input.style.height = '100px'; + input.style.marginBottom = '10px'; + input.style.fontFamily = 'monospace'; + + // Create a button to evaluate the expression + const evalButton = document.createElement('button'); + evalButton.textContent = 'Evaluate'; + + // Create a container to display the results + const output = document.createElement('pre'); + output.style.width = '100%'; + output.style.height = '200px'; + output.style.overflowY = 'auto'; + output.style.backgroundColor = '#f0f0f0'; + output.style.padding = '10px'; + output.style.fontFamily = 'monospace'; + + // Add the input, button, and output to the REPL container + replContainer.appendChild(input); + replContainer.appendChild(evalButton); + replContainer.appendChild(output); + + // Add the REPL container to the playground div + playground.appendChild(replContainer); + + evalButton.addEventListener('click', () => { + const expression = input.value.trim(); + if (expression) { + try { + // Evaluate the expression + const result = evalScheme(expression); + // Append the result to the output area + output.textContent += `> ${expression}\n${result}\n\n`; + } catch (error) { + // Error if the expression is invalid + output.textContent += `> ${expression}\nError: ${error.message}\n\n`; + } + } + // Clear input after evaluation + input.value = ''; + }); +} + + +mount(mountRepl);</textarea> + <div id="console"></div> + + <script> + function evaluateCode() { + const code = document.getElementById('codeInput').value; + const consoleDiv = document.getElementById('console'); + consoleDiv.innerHTML = ''; + + // Custom console.log function to output to the console div + const originalConsoleLog = console.log; + console.log = function(...args) { + args.forEach(arg => { + const output = document.createElement('div'); + output.textContent = typeof arg === 'object' ? JSON.stringify(arg, null, 2) : arg; + consoleDiv.appendChild(output); + }); + originalConsoleLog.apply(console, args); + }; + + try { + eval(code); + } catch (error) { + const errorOutput = document.createElement('div'); + errorOutput.textContent = error; + errorOutput.style.color = 'red'; + consoleDiv.appendChild(errorOutput); + } + + // Restore browser's console.log + console.log = originalConsoleLog; + } + + function downloadCodeAndEditor() { + const codeInput = document.getElementById('codeInput').value; + const htmlContent = document.documentElement.outerHTML.replace( + /<textarea id="codeInput"[^>]*>.*<\/textarea>/, + `<textarea id="codeInput">${codeInput}</textarea>` + ); + + const blob = new Blob([htmlContent], { type: 'text/html' }); + const url = URL.createObjectURL(blob); + const a = document.createElement('a'); + a.href = url; + a.download = 'code_editor.html'; + document.body.appendChild(a); + a.click(); + document.body.removeChild(a); + URL.revokeObjectURL(url); + } + + function shareCode() { + const code = document.getElementById('codeInput').value; + const encodedCode = btoa(encodeURIComponent(code)); + window.location.hash = encodedCode; + window.prompt("Copy the URL to share.\nBe warned! Very long URLs don't share wicked well, sometimes.", window.location.href); + } + + function clearEverything() { + if (!confirm('Are you sure you want to reset the playground?')) { + return; + } else { + window.location.hash = ''; + window.location.reload(); + } + } + + function loadCodeFromHash() { + const hash = window.location.hash.substring(1); + if (hash) { + try { + const decodedCode = decodeURIComponent(atob(hash)); + document.getElementById('codeInput').value = decodedCode; + } catch (error) { + console.error('Failed to decode the URL hash:', error); + } + } + } + + function help() { + const helpText = ` + Welcome to the JavaScript Playground! Here are some tips to get you started: + + 1. Enter your JavaScript code in the textarea. + 2. Click the "Run Code" button to execute your code. + 3. The console output will be displayed below the textarea. + 4. Click the "Clear" button to reset the playground. + 5. Click the "Download" button to save your code and editor as an HTML file. + 6. Click the "Share" button to generate a URL to share your code with others. + 7. You can also press "Cmd + Enter" to run your code. + 8. There's an empty div above the buttons with the id "playground" + 9. You can mount stuff to it using the "mount" function, for more info run "mountHelp()" + 10. You can use the "clear()" function to clear the content's of the console. + + Go nuts! Share scrappy fiddles! + `; + console.log(helpText); + } + + function clear() { + document.getElementById('console').innerHTML = ''; + } + + function mountHelp() { + console.log(` + The mount function is used to mount stuff to the playground div. + It takes a function as an argument, which in turn receives the playground div as an argument. + Before mounting, it clears the playground div. + Here's an example of how to use the mount function: + + mount(playground => { + const h1 = document.createElement('h1'); + h1.textContent = 'Hell is empty and all the devils are here.'; + playground.appendChild(h1); + }); + + This will add an h1 element to the playground div. + `); + } + + function mount(mountFunction) { + const playground = document.getElementById('playground'); + if (!playground) { + console.error("Couldn't find a div with the id 'playground'! You may need to reload the page."); + return; + } + + if (playground.innerHTML.trim() !== "") { + playground.innerHTML = ""; + } + mountFunction(playground); + } + + + document.getElementById('codeInput').addEventListener('keydown', function(event) { + if (event.metaKey && event.key === 'Enter') { + event.preventDefault(); + evaluateCode(); + } + }); + + window.onload = loadCodeFromHash; + </script> + + +</body></html> \ No newline at end of file |