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Add browser REPL example #32

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Add browser REPL example #32

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21 changes: 21 additions & 0 deletions web/index.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>FoxScheme REPL</title>
<style>
body { font-family: monospace; background: #1e1e1e; color: #e0e0e0; margin: 0; padding: 0; display: flex; flex-direction: column; height: 100vh; }
#console { flex: 1; overflow-y: auto; padding: 10px; }
.line.input::before { content: '> '; color: #8be9fd; }
.line.result { color: #50fa7b; }
.line.error { color: #ff5555; }
#prompt { border: none; border-top: 1px solid #333; background: #1e1e1e; color: #e0e0e0; padding: 8px; font-family: inherit; font-size: 1em; }
</style>
</head>
<body>
<div id="console"></div>
<input id="prompt" autocomplete="off" placeholder="Type Scheme code and press Enter" />
<script src="../dist/foxscheme-browser.js"></script>
<script src="repl.js"></script>
</body>
</html>
41 changes: 41 additions & 0 deletions web/repl.js
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(function() {
const consoleDiv = document.getElementById('console');
const prompt = document.getElementById('prompt');
const interpreter = new FoxScheme.Interpreter();
let buffer = '';

function append(text, cls) {
const div = document.createElement('div');
div.className = 'line ' + cls;
div.textContent = text;
consoleDiv.appendChild(div);
consoleDiv.scrollTop = consoleDiv.scrollHeight;
}

function evaluate() {
try {
const parser = new FoxScheme.Parser(buffer);
let obj;
while((obj = parser.nextObject()) !== FoxScheme.Parser.EOS) {
const result = interpreter.eval(obj);
append(String(result), 'result');
}
} catch(err) {
append('Error: ' + err.message, 'error');
}
buffer = '';
}

prompt.addEventListener('keydown', function(e) {
if (e.key === 'Enter') {
e.preventDefault();
const line = prompt.value;
prompt.value = '';
buffer += line + '\n';
append(line, 'input');
if (FoxScheme.Parser.calculateIndentation(buffer) === 0) {
evaluate();
}
}
});
})();