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- <!doctype html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>CodeMirror: Automatically derive odd wrapping behavior for your browser</title>
- <link rel="stylesheet" href="../doc/docs.css">
- </head>
- <body>
- <h1>CodeMirror: odd wrapping shim</h1>
- <p>This is a hack to automatically derive
- a <code>spanAffectsWrapping</code> regexp for a browser. See the
- comments above that variable
- in <a href="../lib/codemirror.js"><code>lib/codemirror.js</code></a>
- for some more details.</p>
- <div style="white-space: pre-wrap; width: 50px;" id="area"></div>
- <pre id="output"></pre>
- <script id="script">
- var a = document.getElementById("area"), bad = Object.create(null);
- var chars = "a~`!@#$%^&*()-_=+}{[]\|'\"/?.>,<:;", l = chars.length;
- for (var x = 0; x < l; ++x) for (var y = 0; y < l; ++y) {
- var s1 = "foooo" + chars.charAt(x), s2 = chars.charAt(y) + "br";
- a.appendChild(document.createTextNode(s1 + s2));
- var h1 = a.offsetHeight;
- a.innerHTML = "";
- a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s1));
- a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s2));
- if (a.offsetHeight != h1)
- bad[chars.charAt(x)] = (bad[chars.charAt(x)] || "") + chars.charAt(y);
- a.innerHTML = "";
- }
- var re = "";
- function toREElt(str) {
- if (str.length > 1) {
- var invert = false;
- if (str.length > chars.length * .6) {
- invert = true;
- var newStr = "";
- for (var i = 0; i < l; ++i) if (str.indexOf(chars.charAt(i)) == -1) newStr += chars.charAt(i);
- str = newStr;
- }
- str = str.replace(/[\-\.\]\"\'\\\/\^a]/g, function(orig) { return orig == "a" ? "\\w" : "\\" + orig; });
- return "[" + (invert ? "^" : "") + str + "]";
- } else if (str == "a") {
- return "\\w";
- } else if (/[?$*()+{}[\]\.|/\'\"]/.test(str)) {
- return "\\" + str;
- } else {
- return str;
- }
- }
- var newRE = "";
- for (;;) {
- var left = null;
- for (var left in bad) break;
- if (left == null) break;
- var right = bad[left];
- delete bad[left];
- for (var other in bad) if (bad[other] == right) {
- left += other;
- delete bad[other];
- }
- newRE += (newRE ? "|" : "") + toREElt(left) + toREElt(right);
- }
- document.getElementById("output").appendChild(document.createTextNode("Your regexp is: " + (newRE || "^$")));
- </script>
- </body>
- </html>
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