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/**
 * CaretPosition.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 module contains logic for creating caret positions within a document a caretposition
 * is similar to a DOMRange object but it doesn't have two endpoints and is also more lightweight
 * since it's now updated live when the DOM changes.
 *
 * @private
 * @class tinymce.caret.CaretPosition
 * @example
 * var caretPos1 = new CaretPosition(container, offset);
 * var caretPos2 = CaretPosition.fromRangeStart(someRange);
 */
define("tinymce/caret/CaretPosition", [
	"tinymce/util/Fun",
	"tinymce/dom/NodeType",
	"tinymce/dom/DOMUtils",
	"tinymce/dom/RangeUtils",
	"tinymce/caret/CaretCandidate",
	"tinymce/geom/ClientRect",
	"tinymce/text/ExtendingChar"
], function(Fun, NodeType, DOMUtils, RangeUtils, CaretCandidate, ClientRect, ExtendingChar) {
	var isElement = NodeType.isElement,
		isCaretCandidate = CaretCandidate.isCaretCandidate,
		isBlock = NodeType.matchStyleValues('display', 'block table'),
		isFloated = NodeType.matchStyleValues('float', 'left right'),
		isValidElementCaretCandidate = Fun.and(isElement, isCaretCandidate, Fun.negate(isFloated)),
		isNotPre = Fun.negate(NodeType.matchStyleValues('white-space', 'pre pre-line pre-wrap')),
		isText = NodeType.isText,
		isBr = NodeType.isBr,
		nodeIndex = DOMUtils.nodeIndex,
		resolveIndex = RangeUtils.getNode;

function isWhiteSpace(chr) {
		return chr && /[\r\n\t ]/.test(chr);
	}

function isHiddenWhiteSpaceRange(range) {
		var container = range.startContainer,
			offset = range.startOffset,
			text;

if (isWhiteSpace(range.toString()) && isNotPre(container.parentNode)) {
			text = container.data;

if (isWhiteSpace(text[offset - 1]) || isWhiteSpace(text[offset + 1])) {
				return true;
			}
		}

return false;
	}

function getCaretPositionClientRects(caretPosition) {
		var clientRects = [], beforeNode, node;

// Hack for older WebKit versions that doesn't
		// support getBoundingClientRect on BR elements
		function getBrClientRect(brNode) {
			var doc = brNode.ownerDocument,
				rng = doc.createRange(),
				nbsp = doc.createTextNode('\u00a0'),
				parentNode = brNode.parentNode,
				clientRect;

parentNode.insertBefore(nbsp, brNode);
			rng.setStart(nbsp, 0);
			rng.setEnd(nbsp, 1);
			clientRect = ClientRect.clone(rng.getBoundingClientRect());
			parentNode.removeChild(nbsp);

return clientRect;
		}

function getBoundingClientRect(item) {
			var clientRect, clientRects;

clientRects = item.getClientRects();
			if (clientRects.length > 0) {
				clientRect = ClientRect.clone(clientRects[0]);
			} else {
				clientRect = ClientRect.clone(item.getBoundingClientRect());
			}

if (isBr(item) && clientRect.left === 0) {
				return getBrClientRect(item);
			}

return clientRect;
		}

function collapseAndInflateWidth(clientRect, toStart) {
			clientRect = ClientRect.collapse(clientRect, toStart);
			clientRect.width = 1;
			clientRect.right = clientRect.left + 1;

return clientRect;
		}

function addUniqueAndValidRect(clientRect) {
			if (clientRect.height === 0) {
				return;
			}

if (clientRects.length > 0) {
				if (ClientRect.isEqual(clientRect, clientRects[clientRects.length - 1])) {
					return;
				}
			}

clientRects.push(clientRect);
		}

function addCharacterOffset(container, offset) {
			var range = container.ownerDocument.createRange();

if (offset < container.data.length) {
				if (ExtendingChar.isExtendingChar(container.data[offset])) {
					return clientRects;
				}
			}

if (offset > 0) {
				range.setStart(container, offset - 1);
				range.setEnd(container, offset);

if (!isHiddenWhiteSpaceRange(range)) {
					addUniqueAndValidRect(collapseAndInflateWidth(getBoundingClientRect(range), false));
				}
			}

if (offset < container.data.length) {
				range.setStart(container, offset);
				range.setEnd(container, offset + 1);

if (!isHiddenWhiteSpaceRange(range)) {
					addUniqueAndValidRect(collapseAndInflateWidth(getBoundingClientRect(range), true));
				}
			}
		}

if (isText(caretPosition.container())) {
			addCharacterOffset(caretPosition.container(), caretPosition.offset());
			return clientRects;
		}

if (isElement(caretPosition.container())) {
			if (caretPosition.isAtEnd()) {
				node = resolveIndex(caretPosition.container(), caretPosition.offset());
				if (isText(node)) {
					addCharacterOffset(node, node.data.length);
				}

if (isValidElementCaretCandidate(node) && !isBr(node)) {
					addUniqueAndValidRect(collapseAndInflateWidth(getBoundingClientRect(node), false));
				}
			} else {
				node = resolveIndex(caretPosition.container(), caretPosition.offset());
				if (isText(node)) {
					addCharacterOffset(node, 0);
				}

if (isValidElementCaretCandidate(node) && caretPosition.isAtEnd()) {
					addUniqueAndValidRect(collapseAndInflateWidth(getBoundingClientRect(node), false));
					return clientRects;
				}

beforeNode = resolveIndex(caretPosition.container(), caretPosition.offset() - 1);
				if (isValidElementCaretCandidate(beforeNode) && !isBr(beforeNode)) {
					if (isBlock(beforeNode) || isBlock(node) || !isValidElementCaretCandidate(node)) {
						addUniqueAndValidRect(collapseAndInflateWidth(getBoundingClientRect(beforeNode), false));
					}
				}

if (isValidElementCaretCandidate(node)) {
					addUniqueAndValidRect(collapseAndInflateWidth(getBoundingClientRect(node), true));
				}
			}
		}

return clientRects;
	}

/**
	 * Represents a location within the document by a container and an offset.
	 *
	 * @constructor
	 * @param {Node} container Container node.
	 * @param {Number} offset Offset within that container node.
	 * @param {Array} clientRects Optional client rects array for the position.
	 */
	function CaretPosition(container, offset, clientRects) {
		function isAtStart() {
			if (isText(container)) {
				return offset === 0;
			}

return offset === 0;
		}

function isAtEnd() {
			if (isText(container)) {
				return offset >= container.data.length;
			}

return offset >= container.childNodes.length;
		}

function toRange() {
			var range;

range = container.ownerDocument.createRange();
			range.setStart(container, offset);
			range.setEnd(container, offset);

return range;
		}

function getClientRects() {
			if (!clientRects) {
				clientRects = getCaretPositionClientRects(new CaretPosition(container, offset));
			}

return clientRects;
		}

function isVisible() {
			return getClientRects().length > 0;
		}

function isEqual(caretPosition) {
			return caretPosition && container === caretPosition.container() && offset === caretPosition.offset();
		}

function getNode(before) {
			return resolveIndex(container, before ? offset - 1 : offset);
		}

return {
			/**
			 * Returns the container node.
			 *
			 * @method container
			 * @return {Node} Container node.
			 */
			container: Fun.constant(container),

/**
			 * Returns the offset within the container node.
			 *
			 * @method offset
			 * @return {Number} Offset within the container node.
			 */
			offset: Fun.constant(offset),

/**
			 * Returns a range out of a the caret position.
			 *
			 * @method toRange
			 * @return {DOMRange} range for the caret position.
			 */
			toRange: toRange,

/**
			 * Returns the client rects for the caret position. Might be multiple rects between
			 * block elements.
			 *
			 * @method getClientRects
			 * @return {Array} Array of client rects.
			 */
			getClientRects: getClientRects,

/**
			 * Returns true if the caret location is visible/displayed on screen.
			 *
			 * @method isVisible
			 * @return {Boolean} true/false if the position is visible or not.
			 */
			isVisible: isVisible,

/**
			 * Returns true if the caret location is at the beginning of text node or container.
			 *
			 * @method isVisible
			 * @return {Boolean} true/false if the position is at the beginning.
			 */
			isAtStart: isAtStart,

/**
			 * Returns true if the caret location is at the end of text node or container.
			 *
			 * @method isVisible
			 * @return {Boolean} true/false if the position is at the end.
			 */
			isAtEnd: isAtEnd,

/**
			 * Compares the caret position to another caret position. This will only compare the
			 * container and offset not it's visual position.
			 *
			 * @method isEqual
			 * @param {tinymce.caret.CaretPosition} caretPosition Caret position to compare with.
			 * @return {Boolean} true if the caret positions are equal.
			 */
			isEqual: isEqual,

/**
			 * Returns the closest resolved node from a node index. That means if you have an offset after the
			 * last node in a container it will return that last node.
			 *
			 * @method getNode
			 * @return {Node} Node that is closest to the index.
			 */
			getNode: getNode
		};
	}

/**
	 * Creates a caret position from the start of a range.
	 *
	 * @method fromRangeStart
	 * @param {DOMRange} range DOM Range to create caret position from.
	 * @return {tinymce.caret.CaretPosition} Caret position from the start of DOM range.
	 */
	CaretPosition.fromRangeStart = function(range) {
		return new CaretPosition(range.startContainer, range.startOffset);
	};

/**
	 * Creates a caret position from the end of a range.
	 *
	 * @method fromRangeEnd
	 * @param {DOMRange} range DOM Range to create caret position from.
	 * @return {tinymce.caret.CaretPosition} Caret position from the end of DOM range.
	 */
	CaretPosition.fromRangeEnd = function(range) {
		return new CaretPosition(range.endContainer, range.endOffset);
	};

/**
	 * Creates a caret position from a node and places the offset after it.
	 *
	 * @method after
	 * @param {Node} node Node to get caret position from.
	 * @return {tinymce.caret.CaretPosition} Caret position from the node.
	 */
	CaretPosition.after = function(node) {
		return new CaretPosition(node.parentNode, nodeIndex(node) + 1);
	};

/**
	 * Creates a caret position from a node and places the offset before it.
	 *
	 * @method before
	 * @param {Node} node Node to get caret position from.
	 * @return {tinymce.caret.CaretPosition} Caret position from the node.
	 */
	CaretPosition.before = function(node) {
		return new CaretPosition(node.parentNode, nodeIndex(node));
	};

return CaretPosition;
});

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