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1 <!doctype html>
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2
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3 <title>CodeMirror: Automatically derive odd wrapping behavior for your browser</title>
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4 <meta charset="utf-8"/>
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5 <link rel=stylesheet href="../doc/docs.css">
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6
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7 <div id=nav>
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8 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
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9
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10 <ul>
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11 <li><a href="../index.html">Home</a>
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12 <li><a href="../doc/manual.html">Manual</a>
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13 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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14 </ul>
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15 <ul>
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16 <li><a class=active href="#">Automatically derive odd wrapping behavior for your browser</a>
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17 </ul>
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18 </div>
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19
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20 <article>
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21 <h2>Automatically derive odd wrapping behavior for your browser</h2>
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22
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23
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24 <p>This is a hack to automatically derive
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25 a <code>spanAffectsWrapping</code> regexp for a browser. See the
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26 comments above that variable
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27 in <a href="../lib/codemirror.js"><code>lib/codemirror.js</code></a>
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28 for some more details.</p>
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29
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30 <div style="white-space: pre-wrap; width: 50px;" id="area"></div>
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31 <pre id="output"></pre>
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32
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33 <script id="script">
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34 var a = document.getElementById("area"), bad = Object.create(null);
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35 var chars = "a~`!@#$%^&*()-_=+}{[]\\|'\"/?.>,<:;", l = chars.length;
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36 for (var x = 0; x < l; ++x) for (var y = 0; y < l; ++y) {
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37 var s1 = "foooo" + chars.charAt(x), s2 = chars.charAt(y) + "br";
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38 a.appendChild(document.createTextNode(s1 + s2));
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39 var h1 = a.offsetHeight;
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40 a.innerHTML = "";
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41 a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s1));
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42 a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s2));
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43 if (a.offsetHeight != h1)
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44 bad[chars.charAt(x)] = (bad[chars.charAt(x)] || "") + chars.charAt(y);
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45 a.innerHTML = "";
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46 }
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47
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48 var re = "";
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49 function toREElt(str) {
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50 if (str.length > 1) {
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51 var invert = false;
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52 if (str.length > chars.length * .6) {
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53 invert = true;
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54 var newStr = "";
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55 for (var i = 0; i < l; ++i) if (str.indexOf(chars.charAt(i)) == -1) newStr += chars.charAt(i);
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56 str = newStr;
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57 }
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58 str = str.replace(/[\-\.\]\"\'\\\/\^a]/g, function(orig) { return orig == "a" ? "\\w" : "\\" + orig; });
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59 return "[" + (invert ? "^" : "") + str + "]";
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60 } else if (str == "a") {
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61 return "\\w";
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62 } else if (/[?$*()+{}[\]\.|/\'\"]/.test(str)) {
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63 return "\\" + str;
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64 } else {
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65 return str;
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66 }
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67 }
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68
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69 var newRE = "";
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70 for (;;) {
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71 var left = null;
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72 for (var left in bad) break;
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73 if (left == null) break;
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74 var right = bad[left];
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75 delete bad[left];
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76 for (var other in bad) if (bad[other] == right) {
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77 left += other;
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78 delete bad[other];
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79 }
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80 newRE += (newRE ? "|" : "") + toREElt(left) + toREElt(right);
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81 }
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82
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83 document.getElementById("output").appendChild(document.createTextNode("Your regexp is: " + (newRE || "^$")));
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84 </script>
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85 </article>
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