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Viewing file:     findattributerange.js (2.22 KB)      -rwxrwxr-x

/**
 * @license Copyright (c) 2003-2021, 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;
}