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findattributerange.js
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findattributerange.js
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/**
* @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module typing/utils/findattributerange
*/
/**
* Returns a model range that covers all consecutive nodes with the same `attributeName` and its `value`
* that intersect the given `position`.
*
* It can be used e.g. to get the entire range on which the `linkHref` attribute needs to be changed when having a
* selection inside a link.
*
* @param {module:engine/model/position~Position} position The start position.
* @param {String} attributeName The attribute name.
* @param {String} value The attribute value.
* @param {module:engine/model/model~Model} model The model instance.
* @returns {module:engine/model/range~Range} The link range.
*/
export default function findAttributeRange( position, attributeName, value, model ) {
return model.createRange(
_findBound( position, attributeName, value, true, model ),
_findBound( position, attributeName, value, false, model )
);
}
// Walks forward or backward (depends on the `lookBack` flag), node by node, as long as they have the same attribute value
// and returns a position just before or after (depends on the `lookBack` flag) the last matched node.
//
// @param {module:engine/model/position~Position} position The start position.
// @param {String} attributeName The attribute name.
// @param {String} value The attribute value.
// @param {Boolean} lookBack Whether the walk direction is forward (`false`) or backward (`true`).
// @returns {module:engine/model/position~Position} The position just before the last matched node.
function _findBound( position, attributeName, value, lookBack, model ) {
// Get node before or after position (depends on `lookBack` flag).
// When position is inside text node then start searching from text node.
let node = position.textNode || ( lookBack ? position.nodeBefore : position.nodeAfter );
let lastNode = null;
while ( node && node.getAttribute( attributeName ) == value ) {
lastNode = node;
node = lookBack ? node.previousSibling : node.nextSibling;
}
return lastNode ? model.createPositionAt( lastNode, lookBack ? 'before' : 'after' ) : position;
}