69 lines
2.0 KiB
JavaScript
69 lines
2.0 KiB
JavaScript
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// Minimal framing needed to use CodeMirror-style parsers to highlight
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// code. Load this along with tokenize.js, stringstream.js, and your
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// parser. Then call highlightText, passing a string as the first
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// argument, and as the second argument either a callback function
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// that will be called with an array of SPAN nodes for every line in
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// the code, or a DOM node to which to append these spans, and
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// optionally (not needed if you only loaded one parser) a parser
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// object.
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// Stuff from util.js that the parsers are using.
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var StopIteration = {toString: function() {return "StopIteration"}};
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var Editor = {};
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var indentUnit = 2;
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(function(){
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function normaliseString(string) {
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var tab = "";
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for (var i = 0; i < indentUnit; i++) tab += " ";
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string = string.replace(/\t/g, tab).replace(/\u00a0/g, " ").replace(/\r\n?/g, "\n");
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var pos = 0, parts = [], lines = string.split("\n");
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for (var line = 0; line < lines.length; line++) {
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if (line != 0) parts.push("\n");
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parts.push(lines[line]);
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}
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return {
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next: function() {
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if (pos < parts.length) return parts[pos++];
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else throw StopIteration;
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}
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};
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}
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window.highlightText = function(string, callback, parser) {
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parser = (parser || Editor.Parser).make(stringStream(normaliseString(string)));
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var line = [];
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if (callback.nodeType == 1) {
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var node = callback;
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callback = function(line) {
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for (var i = 0; i < line.length; i++)
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node.appendChild(line[i]);
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node.appendChild(document.createElement("br"));
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};
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}
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try {
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while (true) {
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var token = parser.next();
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if (token.value == "\n") {
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callback(line);
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line = [];
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}
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else {
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var span = document.createElement("span");
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span.className = token.style;
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span.appendChild(document.createTextNode(token.value));
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line.push(span);
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}
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}
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}
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catch (e) {
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if (e != StopIteration) throw e;
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}
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if (line.length) callback(line);
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}
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})();
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