yjfc_xinxi/ckfinder/plugins/fileeditor/codemirror/js/editor.js

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/* The Editor object manages the content of the editable frame. It
 * catches events, colours nodes, and indents lines. This file also
 * holds some functions for transforming arbitrary DOM structures into
 * plain sequences of <span> and <br> elements
 */

var internetExplorer = document.selection && window.ActiveXObject && /MSIE/.test(navigator.userAgent);
var webkit = /AppleWebKit/.test(navigator.userAgent);
var safari = /Apple Computers, Inc/.test(navigator.vendor);
var gecko = /gecko\/(\d{8})/i.test(navigator.userAgent);

// Make sure a string does not contain two consecutive 'collapseable'
// whitespace characters.
function makeWhiteSpace(n) {
  var buffer = [], nb = true;
  for (; n > 0; n--) {
    buffer.push((nb || n == 1) ? nbsp : " ");
    nb = !nb;
  }
  return buffer.join("");
}

// Create a set of white-space characters that will not be collapsed
// by the browser, but will not break text-wrapping either.
function fixSpaces(string) {
  if (string.charAt(0) == " ") string = nbsp + string.slice(1);
  return string.replace(/\t/g, function(){return makeWhiteSpace(indentUnit);})
    .replace(/[ \u00a0]{2,}/g, function(s) {return makeWhiteSpace(s.length);});
}

function cleanText(text) {
  return text.replace(/\u00a0/g, " ").replace(/\u200b/g, "");
}

// Create a SPAN node with the expected properties for document part
// spans.
function makePartSpan(value, doc) {
  var text = value;
  if (value.nodeType == 3) text = value.nodeValue;
  else value = doc.createTextNode(text);

  var span = doc.createElement("SPAN");
  span.isPart = true;
  span.appendChild(value);
  span.currentText = text;
  return span;
}

// On webkit, when the last BR of the document does not have text
// behind it, the cursor can not be put on the line after it. This
// makes pressing enter at the end of the document occasionally do
// nothing (or at least seem to do nothing). To work around it, this
// function makes sure the document ends with a span containing a
// zero-width space character. The traverseDOM iterator filters such
// character out again, so that the parsers won't see them. This
// function is called from a few strategic places to make sure the
// zwsp is restored after the highlighting process eats it.
var webkitLastLineHack = webkit ?
  function(container) {
    var last = container.lastChild;