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Edit: spanaffectswrapping_shim.html
<!doctype html> <title>CodeMirror: Automatically derive odd wrapping behavior for your browser</title> <meta charset="utf-8"/> <link rel=stylesheet href="../doc/docs.css"> <div id=nav> <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a> <ul> <li><a href="../index.html">Home</a> <li><a href="../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror">Code</a> </ul> <ul> <li><a class=active href="#">Automatically derive odd wrapping behavior for your browser</a> </ul> </div> <article> <h2>Automatically derive odd wrapping behavior for your browser</h2> <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> </article>
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