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comparison src/nabble/view/web/util/codemirror/js/highlight.js @ 0:7ecd1a4ef557

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 21 Mar 2019 19:15:52 -0600
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-1:000000000000 0:7ecd1a4ef557
1 // Minimal framing needed to use CodeMirror-style parsers to highlight
2 // code. Load this along with tokenize.js, stringstream.js, and your
3 // parser. Then call highlightText, passing a string as the first
4 // argument, and as the second argument either a callback function
5 // that will be called with an array of SPAN nodes for every line in
6 // the code, or a DOM node to which to append these spans, and
7 // optionally (not needed if you only loaded one parser) a parser
8 // object.
9
10 // Stuff from util.js that the parsers are using.
11 var StopIteration = {toString: function() {return "StopIteration"}};
12
13 var Editor = {};
14 var indentUnit = 2;
15
16 (function(){
17 function normaliseString(string) {
18 var tab = "";
19 for (var i = 0; i < indentUnit; i++) tab += " ";
20
21 string = string.replace(/\t/g, tab).replace(/\u00a0/g, " ").replace(/\r\n?/g, "\n");
22 var pos = 0, parts = [], lines = string.split("\n");
23 for (var line = 0; line < lines.length; line++) {
24 if (line != 0) parts.push("\n");
25 parts.push(lines[line]);
26 }
27
28 return {
29 next: function() {
30 if (pos < parts.length) return parts[pos++];
31 else throw StopIteration;
32 }
33 };
34 }
35
36 window.highlightText = function(string, callback, parser) {
37 parser = (parser || Editor.Parser).make(stringStream(normaliseString(string)));
38 var line = [];
39 if (callback.nodeType == 1) {
40 var node = callback;
41 callback = function(line) {
42 for (var i = 0; i < line.length; i++)
43 node.appendChild(line[i]);
44 node.appendChild(document.createElement("br"));
45 };
46 }
47
48 try {
49 while (true) {
50 var token = parser.next();
51 if (token.value == "\n") {
52 callback(line);
53 line = [];
54 }
55 else {
56 var span = document.createElement("span");
57 span.className = token.style;
58 span.appendChild(document.createTextNode(token.value));
59 line.push(span);
60 }
61 }
62 }
63 catch (e) {
64 if (e != StopIteration) throw e;
65 }
66 if (line.length) callback(line);
67 }
68 })();