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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

CodeMirror.runMode = function(string, modespec, callback, options) {
  var mode = CodeMirror.getMode(CodeMirror.defaults, modespec);
  var tabSize = (options && options.tabSize) || CodeMirror.defaults.tabSize;

// Create a tokenizing callback function if passed-in callback is a DOM element.
  if (callback.appendChild) {
    var ie = /MSIE \d/.test(navigator.userAgent);
    var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);
    var node = callback, col = 0;
    node.innerHTML = "";
    callback = function(text, style) {
      if (text == "\n") {
        // Emitting LF or CRLF on IE8 or earlier results in an incorrect display.
        // Emitting a carriage return makes everything ok.
        node.appendChild(document.createTextNode(ie_lt9 ? '\r' : text));
        col = 0;
        return;
      }
      var content = "";
      // replace tabs
      for (var pos = 0;;) {
        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 < size; ++i) content += " ";
          pos = idx + 1;
        }
      }
      // Create a node with token style and append it to the callback DOM element.
      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));
      }
    };
  }

});