Web/kzcms/ckfinder/plugins/fileeditor/codemirror/js/undo.js

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/**
 * Storage and control for undo information within a CodeMirror
 * editor. 'Why on earth is such a complicated mess required for
 * that?', I hear you ask. The goal, in implementing this, was to make
 * the complexity of storing and reverting undo information depend
 * only on the size of the edited or restored content, not on the size
 * of the whole document. This makes it necessary to use a kind of
 * 'diff' system, which, when applied to a DOM tree, causes some
 * complexity and hackery.
 *
 * In short, the editor 'touches' BR elements as it parses them, and
 * the UndoHistory stores these. When nothing is touched in commitDelay
 * milliseconds, the changes are committed: It goes over all touched
 * nodes, throws out the ones that did not change since last commit or
 * are no longer in the document, and assembles the rest into zero or
 * more 'chains' -- arrays of adjacent lines. Links back to these
 * chains are added to the BR nodes, while the chain that previously
 * spanned these nodes is added to the undo history. Undoing a change
 * means taking such a chain off the undo history, restoring its
 * content (text is saved per line) and linking it back into the
 * document.
 */

// A history object needs to know about the DOM container holding the
// document, the maximum amount of undo levels it should store, the
// delay (of no input) after which it commits a set of changes, and,
// unfortunately, the 'parent' window -- a window that is not in
// designMode, and on which setTimeout works in every browser.
function UndoHistory(container, maxDepth, commitDelay, editor) {
  this.container = container;
  this.maxDepth = maxDepth; this.commitDelay = commitDelay;
  this.editor = editor;
  // This line object represents the initial, empty editor.
  var initial = {text: "", from: null, to: null};
  // As the borders between lines are represented by BR elements, the
  // start of the first line and the end of the last one are
  // represented by null. Since you can not store any properties
  // (links to line objects) in null, these properties are used in
  // those cases.
  this.first = initial; this.last = initial;
  // Similarly, a 'historyTouched' property is added to the BR in
  // front of lines that have already been touched, and 'firstTouched'
  // is used for the first line.
  this.firstTouched = false;
  // History is the set of committed changes, touched is the set of
  // nodes touched since the last commit.
  this.history = []; this.redoHistory = []; this.touched = []; this.lostundo = 0;
}

UndoHistory.prototype = {
  // Schedule a commit (if no other touches come in for commitDelay
  // milliseconds).
  scheduleCommit: function() {
    var self = this;
    parent.clearTimeout(this.commitTimeout);
    this.commitTimeout = parent.setTimeout(function(){self.tryCommit();}, this.commitDelay);
  },

  // Mark a node as touched. Null is a valid argument.
  touch: function(node) {