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<!doctype html>
<html>
<head>
<title>CodeMirror: Mode-Changing Demo</title>
<link rel="stylesheet" href="../lib/codemirror.css">
<script src="../lib/codemirror.js"></script>
<script src="../mode/javascript/javascript.js"></script>
<script src="../mode/scheme/scheme.js"></script>
<link rel="stylesheet" href="../doc/docs.css">
<style type="text/css">
.CodeMirror {border: 1px solid black;}
</style>
</head>
<body>
<h1>CodeMirror: Mode-Changing demo</h1>
<form><textarea id="code" name="code">
;; If there is Scheme code in here, the editor will be in Scheme mode.
;; If you put in JS instead, it'll switch to JS mode.
(define (double x)
(* x x))
</textarea></form>
<p>On changes to the content of the above editor, a (crude) script
tries to auto-detect the language used, and switches the editor to
either JavaScript or Scheme mode based on that.</p>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
mode: "scheme",
lineNumbers: true,
matchBrackets: true,
tabMode: "indent",
onChange: function() {
clearTimeout(pending);
setTimeout(update, 400);
}
});
var pending;
function looksLikeScheme(code) {
return !/^\s*\(\s*function\b/.test(code) && /^\s*[;\(]/.test(code);
}
function update() {
editor.setOption("mode", looksLikeScheme(editor.getValue()) ? "scheme" : "javascript");
}
</script>
</body>
</html>
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