86 lines
3.0 KiB
HTML
86 lines
3.0 KiB
HTML
<!doctype html>
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<title>CodeMirror: Automatically derive odd wrapping behavior for your browser</title>
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<meta charset="utf-8"/>
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<link rel=stylesheet href="../doc/docs.css">
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<div id=nav>
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<a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
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<ul>
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<li><a href="../index.html">Home</a>
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<li><a href="../doc/manual.html">Manual</a>
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<li><a href="https://github.com/codemirror/codemirror">Code</a>
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</ul>
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<ul>
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<li><a class=active href="#">Automatically derive odd wrapping behavior for your browser</a>
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</ul>
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</div>
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<article>
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<h2>Automatically derive odd wrapping behavior for your browser</h2>
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<p>This is a hack to automatically derive
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a <code>spanAffectsWrapping</code> regexp for a browser. See the
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comments above that variable
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in <a href="../lib/codemirror.js"><code>lib/codemirror.js</code></a>
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for some more details.</p>
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<div style="white-space: pre-wrap; width: 50px;" id="area"></div>
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<pre id="output"></pre>
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<script id="script">
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var a = document.getElementById("area"), bad = Object.create(null);
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var chars = "a~`!@#$%^&*()-_=+}{[]\\|'\"/?.>,<:;", l = chars.length;
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for (var x = 0; x < l; ++x) for (var y = 0; y < l; ++y) {
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var s1 = "foooo" + chars.charAt(x), s2 = chars.charAt(y) + "br";
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a.appendChild(document.createTextNode(s1 + s2));
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var h1 = a.offsetHeight;
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a.innerHTML = "";
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a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s1));
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a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s2));
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if (a.offsetHeight != h1)
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bad[chars.charAt(x)] = (bad[chars.charAt(x)] || "") + chars.charAt(y);
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a.innerHTML = "";
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}
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var re = "";
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function toREElt(str) {
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if (str.length > 1) {
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var invert = false;
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if (str.length > chars.length * .6) {
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invert = true;
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var newStr = "";
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for (var i = 0; i < l; ++i) if (str.indexOf(chars.charAt(i)) == -1) newStr += chars.charAt(i);
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str = newStr;
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}
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str = str.replace(/[\-\.\]\"\'\\\/\^a]/g, function(orig) { return orig == "a" ? "\\w" : "\\" + orig; });
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return "[" + (invert ? "^" : "") + str + "]";
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} else if (str == "a") {
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return "\\w";
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} else if (/[?$*()+{}[\]\.|/\'\"]/.test(str)) {
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return "\\" + str;
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} else {
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return str;
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}
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}
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var newRE = "";
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for (;;) {
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var left = null;
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for (var left in bad) break;
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if (left == null) break;
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var right = bad[left];
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delete bad[left];
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for (var other in bad) if (bad[other] == right) {
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left += other;
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delete bad[other];
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}
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newRE += (newRE ? "|" : "") + toREElt(left) + toREElt(right);
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}
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document.getElementById("output").appendChild(document.createTextNode("Your regexp is: " + (newRE || "^$")));
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</script>
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</article>
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