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    <p>I would hack Mode Runner like this</p> <pre><code> CodeMirror.runMode = function(string, modespec, callback, options) { var mode = CodeMirror.getMode(CodeMirror.defaults, modespec); var lineNumber = 1; // Line number if (callback.nodeType == 1) { var tabSize = (options &amp;&amp; options.tabSize) || CodeMirror.defaults.tabSize; var node = callback, col = 0; node.innerHTML = ""; callback = function(text, style) { if (text == "\n") { lineNumber++ ; //increment line number var lineNum = document.createTextNode(lineNumber); // node.appendChild(document.createElement("br")); node.appendChild(lineNum); // append col = 0; return; } var content = ""; // replace tabs for (var pos = 0;;) { var lineNum = document.createTextNode(lineNumber + " ") var idx = text.indexOf("\t", pos); if (idx == -1) { content += text.slice(pos); col += text.length - pos; break; } else { col += idx - pos; content += text.slice(pos, idx); var size = tabSize - col % tabSize; col += size; for (var i = 0; i &lt; size; ++i) content += " "; pos = idx + 1; } } if (style) { var sp = node.appendChild(document.createElement("span")); sp.className = "cm-" + style.replace(/ +/g, " cm-"); sp.appendChild(document.createTextNode(content)); } else { node.appendChild(document.createTextNode(content)); } }; } var lines = CodeMirror.splitLines(string), state = CodeMirror.startState(mode); for (var i = 0, e = lines.length; i &lt; e; ++i) { if (i) callback("\n"); var stream = new CodeMirror.StringStream(lines[i]); while (!stream.eol()) { var style = mode.token(stream, state); callback(stream.current(), style, i, stream.start); stream.start = stream.pos; } } // add the first line var outputDiv = document.getElementById("output"); var firstLine = document.createTextNode("1 "); outputDiv.insertBefore(firstLine, outputDiv.firstChild); }; </code></pre>
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