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Viewing file:     utils.js (1.93 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 image/imagecaption/utils
 */

/**
 * Returns the caption model element from a given image element. Returns `null` if no caption is found.
 *
 * @param {module:engine/model/element~Element} imageModelElement
 * @returns {module:engine/model/element~Element|null}
 */
export function getCaptionFromImageModelElement( imageModelElement ) {
	for ( const node of imageModelElement.getChildren() ) {
		if ( !!node && node.is( 'element', 'caption' ) ) {
			return node;
		}
	}

	return null;
}

/**
 * Returns the caption model element for a model selection. Returns `null` if the selection has no caption element ancestor.
 *
 * @param {module:image/imageutils~ImageUtils} imageUtils
 * @param {module:engine/model/selection~Selection} selection
 * @returns {module:engine/model/element~Element|null}
 */
export function getCaptionFromModelSelection( imageUtils, selection ) {
	const captionElement = selection.getFirstPosition().findAncestor( 'caption' );

	if ( !captionElement ) {
		return null;
	}

	if ( imageUtils.isBlockImage( captionElement.parent ) ) {
		return captionElement;
	}

	return null;
}

/**
 * {@link module:engine/view/matcher~Matcher} pattern. Checks if a given element is a `<figcaption>` element that is placed
 * inside the image `<figure>` element.
 *
 * @param {module:image/imageutils~ImageUtils} imageUtils
 * @param {module:engine/view/element~Element} element
 * @returns {Object|null} Returns the object accepted by {@link module:engine/view/matcher~Matcher} or `null` if the element
 * cannot be matched.
 */
export function matchImageCaptionViewElement( imageUtils, element ) {
	// Convert only captions for images.
	if ( element.name == 'figcaption' && imageUtils.isBlockImageView( element.parent ) ) {
		return { name: true };
	}

	return null;
}