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comparison .cms/lib/codemirror/demo/spanaffectswrapping_shim.html @ 0:78edf6b517a0 draft
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author | Coffee CMS <info@coffee-cms.ru> |
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date | Fri, 11 Oct 2024 22:40:23 +0000 |
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1 <!doctype html> | |
2 | |
3 <title>CodeMirror: Automatically derive odd wrapping behavior for your browser</title> | |
4 <meta charset="utf-8"/> | |
5 <link rel=stylesheet href="../doc/docs.css"> | |
6 | |
7 <div id=nav> | |
8 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a> | |
9 | |
10 <ul> | |
11 <li><a href="../index.html">Home</a> | |
12 <li><a href="../doc/manual.html">Manual</a> | |
13 <li><a href="https://github.com/codemirror/codemirror5">Code</a> | |
14 </ul> | |
15 <ul> | |
16 <li><a class=active href="#">Automatically derive odd wrapping behavior for your browser</a> | |
17 </ul> | |
18 </div> | |
19 | |
20 <article> | |
21 <h2>Automatically derive odd wrapping behavior for your browser</h2> | |
22 | |
23 | |
24 <p>This is a hack to automatically derive | |
25 a <code>spanAffectsWrapping</code> regexp for a browser. See the | |
26 comments above that variable | |
27 in <a href="../lib/codemirror.js"><code>lib/codemirror.js</code></a> | |
28 for some more details.</p> | |
29 | |
30 <div style="white-space: pre-wrap; width: 50px;" id="area"></div> | |
31 <pre id="output"></pre> | |
32 | |
33 <script id="script"> | |
34 var a = document.getElementById("area"), bad = Object.create(null); | |
35 var chars = "a~`!@#$%^&*()-_=+}{[]\\|'\"/?.>,<:;", l = chars.length; | |
36 for (var x = 0; x < l; ++x) for (var y = 0; y < l; ++y) { | |
37 var s1 = "foooo" + chars.charAt(x), s2 = chars.charAt(y) + "br"; | |
38 a.appendChild(document.createTextNode(s1 + s2)); | |
39 var h1 = a.offsetHeight; | |
40 a.innerHTML = ""; | |
41 a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s1)); | |
42 a.appendChild(document.createElement("span")).appendChild(document.createTextNode(s2)); | |
43 if (a.offsetHeight != h1) | |
44 bad[chars.charAt(x)] = (bad[chars.charAt(x)] || "") + chars.charAt(y); | |
45 a.innerHTML = ""; | |
46 } | |
47 | |
48 var re = ""; | |
49 function toREElt(str) { | |
50 if (str.length > 1) { | |
51 var invert = false; | |
52 if (str.length > chars.length * .6) { | |
53 invert = true; | |
54 var newStr = ""; | |
55 for (var i = 0; i < l; ++i) if (str.indexOf(chars.charAt(i)) == -1) newStr += chars.charAt(i); | |
56 str = newStr; | |
57 } | |
58 str = str.replace(/[\-\.\]\"\'\\\/\^a]/g, function(orig) { return orig == "a" ? "\\w" : "\\" + orig; }); | |
59 return "[" + (invert ? "^" : "") + str + "]"; | |
60 } else if (str == "a") { | |
61 return "\\w"; | |
62 } else if (/[?$*()+{}[\]\.|/\'\"]/.test(str)) { | |
63 return "\\" + str; | |
64 } else { | |
65 return str; | |
66 } | |
67 } | |
68 | |
69 var newRE = ""; | |
70 for (;;) { | |
71 var left = null; | |
72 for (var left in bad) break; | |
73 if (left == null) break; | |
74 var right = bad[left]; | |
75 delete bad[left]; | |
76 for (var other in bad) if (bad[other] == right) { | |
77 left += other; | |
78 delete bad[other]; | |
79 } | |
80 newRE += (newRE ? "|" : "") + toREElt(left) + toREElt(right); | |
81 } | |
82 | |
83 document.getElementById("output").appendChild(document.createTextNode("Your regexp is: " + (newRE || "^$"))); | |
84 </script> | |
85 </article> |