/**
* CaretBookmark.js
*
* Released under LGPL License.
* Copyright (c) 1999-2017 Ephox Corp. All rights reserved
*
* License: http://www.tinymce.com/license
* Contributing: http://www.tinymce.com/contributing
*/
/**
* This module creates or resolves xpath like string representation of a CaretPositions.
*
* The format is a / separated list of chunks with:
* <element|text()>[index|after|before]
*
* For example:
* p[0]/b[0]/text()[0],1 = <p><b>a|c</b></p>
* p[0]/img[0],before = <p>|<img></p>
* p[0]/img[0],after = <p><img>|</p>
*
* @private
* @static
* @class tinymce.caret.CaretBookmark
* @example
* var bookmark = CaretBookmark.create(rootElm, CaretPosition.before(rootElm.firstChild));
* var caretPosition = CaretBookmark.resolve(bookmark);
*/
define(
'tinymce.core.caret.CaretBookmark',
[
'tinymce.core.dom.NodeType',
'tinymce.core.dom.DOMUtils',
'tinymce.core.util.Fun',
'tinymce.core.util.Arr',
'tinymce.core.caret.CaretPosition'
],
function (NodeType, DomUtils, Fun, Arr, CaretPosition) {
var isText = NodeType.isText,
isBogus = NodeType.isBogus,
nodeIndex = DomUtils.nodeIndex;
var normalizedParent = function (node) {
var parentNode = node.parentNode;
if (isBogus(parentNode)) {
return normalizedParent(parentNode);
}
return parentNode;
};
var getChildNodes = function (node) {
if (!node) {
return [];
}
return Arr.reduce(node.childNodes, function (result, node) {
if (isBogus(node) && node.nodeName != 'BR') {
result = result.concat(getChildNodes(node));
} else {
result.push(node);
}
return result;
}, []);
};
var normalizedTextOffset = function (textNode, offset) {
while ((textNode = textNode.previousSibling)) {
if (!isText(textNode)) {
break;
}
offset += textNode.data.length;
}
return offset;
};
var equal = function (targetValue) {
return function (value) {
return targetValue === value;
};
};
var normalizedNodeIndex = function (node) {
var nodes, index, numTextFragments;
nodes = getChildNodes(normalizedParent(node));
index = Arr.findIndex(nodes, equal(node), node);
nodes = nodes.slice(0, index + 1);
numTextFragments = Arr.reduce(nodes, function (result, node, i) {
if (isText(node) && isText(nodes[i - 1])) {
result++;
}
return result;
}, 0);
nodes = Arr.filter(nodes, NodeType.matchNodeNames(node.nodeName));
index = Arr.findIndex(nodes, equal(node), node);
return index - numTextFragments;
};
var createPathItem = function (node) {
var name;
if (isText(node)) {
name = 'text()';
} else {
name = node.nodeName.toLowerCase();
}
return name + '[' + normalizedNodeIndex(node) + ']';
};
var parentsUntil = function (rootNode, node, predicate) {
var parents = [];
for (node = node.parentNode; node != rootNode; node = node.parentNode) {
if (predicate && predicate(node)) {
break;
}
parents.push(node);
}
return parents;
};
var create = function (rootNode, caretPosition) {
var container, offset, path = [],
outputOffset, childNodes, parents;
container = caretPosition.container();
offset = caretPosition.offset();
if (isText(container)) {
outputOffset = normalizedTextOffset(container, offset);
} else {
childNodes = container.childNodes;
if (offset >= childNodes.length) {
outputOffset = 'after';
offset = childNodes.length - 1;
} else {
outputOffset = 'before';
}
container = childNodes[offset];
}
path.push(createPathItem(container));
parents = parentsUntil(rootNode, container);
parents = Arr.filter(parents, Fun.negate(NodeType.isBogus));
path = path.concat(Arr.map(parents, function (node) {
return createPathItem(node);
}));
return path.reverse().join('/') + ',' + outputOffset;
};
var resolvePathItem = function (node, name, index) {
var nodes = getChildNodes(node);
nodes = Arr.filter(nodes, function (node, index) {
return !isText(node) || !isText(nodes[index - 1]);
});
nodes = Arr.filter(nodes, NodeType.matchNodeNames(name));
return nodes[index];
};
var findTextPosition = function (container, offset) {
var node = container, targetOffset = 0, dataLen;
while (isText(node)) {
dataLen = node.data.length;
if (offset >= targetOffset && offset <= targetOffset + dataLen) {
container = node;
offset = offset - targetOffset;
break;
}
if (!isText(node.nextSibling)) {
container = node;
offset = dataLen;
break;
}
targetOffset += dataLen;
node = node.nextSibling;
}
if (offset > container.data.length) {
offset = container.data.length;
}
return new CaretPosition(container, offset);
};
var resolve = function (rootNode, path) {
var parts, container, offset;
if (!path) {
return null;
}
parts = path.split(',');
path = parts[0].split('/');
offset = parts.length > 1 ? parts[1] : 'before';
container = Arr.reduce(path, function (result, value) {
value = /([\w\-\(\)]+)\[([0-9]+)\]/.exec(value);
if (!value) {
return null;
}
if (value[1] === 'text()') {
value[1] = '#text';
}
return resolvePathItem(result, value[1], parseInt(value[2], 10));
}, rootNode);
if (!container) {
return null;
}
if (!isText(container)) {
if (offset === 'after') {
offset = nodeIndex(container) + 1;
} else {
offset = nodeIndex(container);
}
return new CaretPosition(container.parentNode, offset);
}
return findTextPosition(container, parseInt(offset, 10));
};
return {
/**
* Create a xpath bookmark location for the specified caret position.
*
* @method create
* @param {Node} rootNode Root node to create bookmark within.
* @param {tinymce.caret.CaretPosition} caretPosition Caret position within the root node.
* @return {String} String xpath like location of caret position.
*/
create: create,
/**
* Resolves a xpath like bookmark location to the a caret position.
*
* @method resolve
* @param {Node} rootNode Root node to resolve xpath bookmark within.
* @param {String} bookmark Bookmark string to resolve.
* @return {tinymce.caret.CaretPosition} Caret position resolved from xpath like bookmark.
*/
resolve: resolve
};
}
);
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