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/**
 * BookmarkManager.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class handles selection bookmarks.
 *
 * @class tinymce.dom.BookmarkManager
 */
define("tinymce/dom/BookmarkManager", [
	"tinymce/Env",
	"tinymce/util/Tools",
	"tinymce/caret/CaretContainer",
	"tinymce/caret/CaretBookmark",
	"tinymce/caret/CaretPosition",
	"tinymce/dom/NodeType"
], function(Env, Tools, CaretContainer, CaretBookmark, CaretPosition, NodeType) {
	var isContentEditableFalse = NodeType.isContentEditableFalse;

/**
	 * Constructs a new BookmarkManager instance for a specific selection instance.
	 *
	 * @constructor
	 * @method BookmarkManager
	 * @param {tinymce.dom.Selection} selection Selection instance to handle bookmarks for.
	 */
	function BookmarkManager(selection) {
		var dom = selection.dom;

/**
		 * Returns a bookmark location for the current selection. This bookmark object
		 * can then be used to restore the selection after some content modification to the document.
		 *
		 * @method getBookmark
		 * @param {Number} type Optional state if the bookmark should be simple or not. Default is complex.
		 * @param {Boolean} normalized Optional state that enables you to get a position that it would be after normalization.
		 * @return {Object} Bookmark object, use moveToBookmark with this object to restore the selection.
		 * @example
		 * // Stores a bookmark of the current selection
		 * var bm = tinymce.activeEditor.selection.getBookmark();
		 *
		 * tinymce.activeEditor.setContent(tinymce.activeEditor.getContent() + 'Some new content');
		 *
		 * // Restore the selection bookmark
		 * tinymce.activeEditor.selection.moveToBookmark(bm);
		 */
		this.getBookmark = function(type, normalized) {
			var rng, rng2, id, collapsed, name, element, chr = '&#xFEFF;', styles;

function findIndex(name, element) {
				var count = 0;

Tools.each(dom.select(name), function(node) {
					if (node.getAttribute('data-mce-bogus') === 'all') {
						return;
					}

if (node == element) {
						return false;
					}

count++;
				});

return count;
			}

function normalizeTableCellSelection(rng) {
				function moveEndPoint(start) {
					var container, offset, childNodes, prefix = start ? 'start' : 'end';

container = rng[prefix + 'Container'];
					offset = rng[prefix + 'Offset'];

if (container.nodeType == 1 && container.nodeName == "TR") {
						childNodes = container.childNodes;
						container = childNodes[Math.min(start ? offset : offset - 1, childNodes.length - 1)];
						if (container) {
							offset = start ? 0 : container.childNodes.length;
							rng['set' + (start ? 'Start' : 'End')](container, offset);
						}
					}
				}

moveEndPoint(true);
				moveEndPoint();

return rng;
			}

function getLocation(rng) {
				var root = dom.getRoot(), bookmark = {};

function getPoint(rng, start) {
					var container = rng[start ? 'startContainer' : 'endContainer'],
						offset = rng[start ? 'startOffset' : 'endOffset'], point = [], node, childNodes, after = 0;

if (container.nodeType == 3) {
						if (normalized) {
							for (node = container.previousSibling; node && node.nodeType == 3; node = node.previousSibling) {
								offset += node.nodeValue.length;
							}
						}

point.push(offset);
					} else {
						childNodes = container.childNodes;

if (offset >= childNodes.length && childNodes.length) {
							after = 1;
							offset = Math.max(0, childNodes.length - 1);
						}

point.push(dom.nodeIndex(childNodes[offset], normalized) + after);
					}

for (; container && container != root; container = container.parentNode) {
						point.push(dom.nodeIndex(container, normalized));
					}

return point;
				}

bookmark.start = getPoint(rng, true);

if (!selection.isCollapsed()) {
					bookmark.end = getPoint(rng);
				}

return bookmark;
			}

function findAdjacentContentEditableFalseElm(rng) {
				function findSibling(node) {
					var sibling;

if (CaretContainer.isCaretContainer(node)) {
						if (NodeType.isText(node) && CaretContainer.isCaretContainerBlock(node)) {
							node = node.parentNode;
						}

sibling = node.previousSibling;
						if (isContentEditableFalse(sibling)) {
							return sibling;
						}

sibling = node.nextSibling;
						if (isContentEditableFalse(sibling)) {
							return sibling;
						}
					}
				}

return findSibling(rng.startContainer) || findSibling(rng.endContainer);
			}

if (type == 2) {
				element = selection.getNode();
				name = element ? element.nodeName : null;
				rng = selection.getRng();

if (isContentEditableFalse(element) || name == 'IMG') {
					return {name: name, index: findIndex(name, element)};
				}

if (selection.tridentSel) {
					return selection.tridentSel.getBookmark(type);
				}

element = findAdjacentContentEditableFalseElm(rng);
				if (element) {
					name = element.tagName;
					return {name: name, index: findIndex(name, element)};
				}

return getLocation(rng);
			}

if (type == 3) {
				rng = selection.getRng();

return {
					start: CaretBookmark.create(dom.getRoot(), CaretPosition.fromRangeStart(rng)),
					end: CaretBookmark.create(dom.getRoot(), CaretPosition.fromRangeEnd(rng))
				};
			}

// Handle simple range
			if (type) {
				return {rng: selection.getRng()};
			}

rng = selection.getRng();
			id = dom.uniqueId();
			collapsed = selection.isCollapsed();
			styles = 'overflow:hidden;line-height:0px';

// Explorer method
			if (rng.duplicate || rng.item) {
				// Text selection
				if (!rng.item) {
					rng2 = rng.duplicate();

try {
						// Insert start marker
						rng.collapse();
						rng.pasteHTML('' + chr + '');

// Insert end marker
						if (!collapsed) {
							rng2.collapse(false);

// Detect the empty space after block elements in IE and move the
							// end back one character ] becomes ]
							rng.moveToElementText(rng2.parentElement());
							if (rng.compareEndPoints('StartToEnd', rng2) === 0) {
								rng2.move('character', -1);
							}

rng2.pasteHTML('' + chr + '');
						}
					} catch (ex) {
						// IE might throw unspecified error so lets ignore it
						return null;
					}
				} else {
					// Control selection
					element = rng.item(0);
					name = element.nodeName;

return {name: name, index: findIndex(name, element)};
				}
			} else {
				element = selection.getNode();
				name = element.nodeName;
				if (name == 'IMG') {
					return {name: name, index: findIndex(name, element)};
				}

// W3C method
				rng2 = normalizeTableCellSelection(rng.cloneRange());

// Insert end marker
				if (!collapsed) {
					rng2.collapse(false);
					rng2.insertNode(dom.create('span', {'data-mce-type': "bookmark", id: id + '_end', style: styles}, chr));
				}

rng = normalizeTableCellSelection(rng);
				rng.collapse(true);
				rng.insertNode(dom.create('span', {'data-mce-type': "bookmark", id: id + '_start', style: styles}, chr));
			}

selection.moveToBookmark({id: id, keep: 1});

return {id: id};
		};

/**
		 * Restores the selection to the specified bookmark.
		 *
		 * @method moveToBookmark
		 * @param {Object} bookmark Bookmark to restore selection from.
		 * @return {Boolean} true/false if it was successful or not.
		 * @example
		 * // Stores a bookmark of the current selection
		 * var bm = tinymce.activeEditor.selection.getBookmark();
		 *
		 * tinymce.activeEditor.setContent(tinymce.activeEditor.getContent() + 'Some new content');
		 *
		 * // Restore the selection bookmark
		 * tinymce.activeEditor.selection.moveToBookmark(bm);
		 */
		this.moveToBookmark = function(bookmark) {
			var rng, root, startContainer, endContainer, startOffset, endOffset;

function setEndPoint(start) {
				var point = bookmark[start ? 'start' : 'end'], i, node, offset, children;

if (point) {
					offset = point[0];

// Find container node
					for (node = root, i = point.length - 1; i >= 1; i--) {
						children = node.childNodes;

if (point[i] > children.length - 1) {
							return;
						}

node = children[point[i]];
					}

// Move text offset to best suitable location
					if (node.nodeType === 3) {
						offset = Math.min(point[0], node.nodeValue.length);
					}

// Move element offset to best suitable location
					if (node.nodeType === 1) {
						offset = Math.min(point[0], node.childNodes.length);
					}

// Set offset within container node
					if (start) {
						rng.setStart(node, offset);
					} else {
						rng.setEnd(node, offset);
					}
				}

return true;
			}

function restoreEndPoint(suffix) {
				var marker = dom.get(bookmark.id + '_' + suffix), node, idx, next, prev, keep = bookmark.keep;

if (marker) {
					node = marker.parentNode;

if (suffix == 'start') {
						if (!keep) {
							idx = dom.nodeIndex(marker);
						} else {
							node = marker.firstChild;
							idx = 1;
						}

startContainer = endContainer = node;
						startOffset = endOffset = idx;
					} else {
						if (!keep) {
							idx = dom.nodeIndex(marker);
						} else {
							node = marker.firstChild;
							idx = 1;
						}

endContainer = node;
						endOffset = idx;
					}

if (!keep) {
						prev = marker.previousSibling;
						next = marker.nextSibling;

// Remove all marker text nodes
						Tools.each(Tools.grep(marker.childNodes), function(node) {
							if (node.nodeType == 3) {
								node.nodeValue = node.nodeValue.replace(/\uFEFF/g, '');
							}
						});

// Remove marker but keep children if for example contents where inserted into the marker
						// Also remove duplicated instances of the marker for example by a
						// split operation or by WebKit auto split on paste feature
						while ((marker = dom.get(bookmark.id + '_' + suffix))) {
							dom.remove(marker, 1);
						}

// If siblings are text nodes then merge them unless it's Opera since it some how removes the node
						// and we are sniffing since adding a lot of detection code for a browser with 3% of the market
						// isn't worth the effort. Sorry, Opera but it's just a fact
						if (prev && next && prev.nodeType == next.nodeType && prev.nodeType == 3 && !Env.opera) {
							idx = prev.nodeValue.length;
							prev.appendData(next.nodeValue);
							dom.remove(next);

if (suffix == 'start') {
								startContainer = endContainer = prev;
								startOffset = endOffset = idx;
							} else {
								endContainer = prev;
								endOffset = idx;
							}
						}
					}
				}
			}

function addBogus(node) {
				// Adds a bogus BR element for empty block elements
				if (dom.isBlock(node) && !node.innerHTML && !Env.ie) {
					node.innerHTML = ' ';
				}

return node;
			}

function resolveCaretPositionBookmark() {
				var rng, pos;

rng = dom.createRng();
				pos = CaretBookmark.resolve(dom.getRoot(), bookmark.start);
				rng.setStart(pos.container(), pos.offset());

pos = CaretBookmark.resolve(dom.getRoot(), bookmark.end);
				rng.setEnd(pos.container(), pos.offset());

return rng;
			}

if (bookmark) {
				if (Tools.isArray(bookmark.start)) {
					rng = dom.createRng();
					root = dom.getRoot();

if (selection.tridentSel) {
						return selection.tridentSel.moveToBookmark(bookmark);
					}

if (setEndPoint(true) && setEndPoint()) {
						selection.setRng(rng);
					}
				} else if (typeof bookmark.start == 'string') {
					selection.setRng(resolveCaretPositionBookmark(bookmark));
				} else if (bookmark.id) {
					// Restore start/end points
					restoreEndPoint('start');
					restoreEndPoint('end');

if (startContainer) {
						rng = dom.createRng();
						rng.setStart(addBogus(startContainer), startOffset);
						rng.setEnd(addBogus(endContainer), endOffset);
						selection.setRng(rng);
					}
				} else if (bookmark.name) {
					selection.select(dom.select(bookmark.name)[bookmark.index]);
				} else if (bookmark.rng) {
					selection.setRng(bookmark.rng);
				}
			}
		};
	}

/**
	 * Returns true/false if the specified node is a bookmark node or not.
	 *
	 * @static
	 * @method isBookmarkNode
	 * @param {DOMNode} node DOM Node to check if it's a bookmark node or not.
	 * @return {Boolean} true/false if the node is a bookmark node or not.
	 */
	BookmarkManager.isBookmarkNode = function(node) {
		return node && node.tagName === 'SPAN' && node.getAttribute('data-mce-type') === 'bookmark';
	};

return BookmarkManager;
});

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