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Viewing file:     table-cell-paragraph-post-fixer.js (4.09 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 table/converters/table-cell-paragraph-post-fixer
 */

/**
 * Injects a table cell post-fixer into the model which inserts a `paragraph` element into empty table cells.
 *
 * A table cell must contain at least one block element as a child. An empty table cell will have an empty `paragraph` as a child.
 *
 *		<table>
 *			<tableRow>
 *				<tableCell></tableCell>
 *			</tableRow>
 *		</table>
 *
 * Will be fixed to:
 *
 *		<table>
 *			<tableRow>
 *				<tableCell><paragraph></paragraph></tableCell>
 *			</tableRow>
 *		</table>
 *
 * @param {module:engine/model/model~Model} model
 */
export default function injectTableCellParagraphPostFixer( model ) {
	model.document.registerPostFixer( writer => tableCellContentsPostFixer( writer, model ) );
}

// The table cell contents post-fixer.
//
// @param {module:engine/model/writer~Writer} writer
// @param {module:engine/model/model~Model} model
function tableCellContentsPostFixer( writer, model ) {
	const changes = model.document.differ.getChanges();

	let wasFixed = false;

	for ( const entry of changes ) {
		if ( entry.type == 'insert' && entry.name == 'table' ) {
			wasFixed = fixTable( entry.position.nodeAfter, writer ) || wasFixed;
		}

		if ( entry.type == 'insert' && entry.name == 'tableRow' ) {
			wasFixed = fixTableRow( entry.position.nodeAfter, writer ) || wasFixed;
		}

		if ( entry.type == 'insert' && entry.name == 'tableCell' ) {
			wasFixed = fixTableCellContent( entry.position.nodeAfter, writer ) || wasFixed;
		}

		if ( checkTableCellChange( entry ) ) {
			wasFixed = fixTableCellContent( entry.position.parent, writer ) || wasFixed;
		}
	}

	return wasFixed;
}

// Fixes all table cells in a table.
//
// @param {module:engine/model/element~Element} table
// @param {module:engine/model/writer~Writer} writer
function fixTable( table, writer ) {
	let wasFixed = false;

	for ( const row of table.getChildren() ) {
		if ( row.is( 'element', 'tableRow' ) ) {
			wasFixed = fixTableRow( row, writer ) || wasFixed;
		}
	}

	return wasFixed;
}

// Fixes all table cells in a table row.
//
// @param {module:engine/model/element~Element} tableRow
// @param {module:engine/model/writer~Writer} writer
function fixTableRow( tableRow, writer ) {
	let wasFixed = false;

	for ( const tableCell of tableRow.getChildren() ) {
		wasFixed = fixTableCellContent( tableCell, writer ) || wasFixed;
	}

	return wasFixed;
}

// Fixes all table cell content by:
// - Adding a paragraph to a table cell without any child.
// - Wrapping direct $text in a `<paragraph>`.
//
// @param {module:engine/model/element~Element} table
// @param {module:engine/model/writer~Writer} writer
// @returns {Boolean}
function fixTableCellContent( tableCell, writer ) {
	// Insert paragraph to an empty table cell.
	if ( tableCell.childCount == 0 ) {
		// @if CK_DEBUG_TABLE // console.log( 'Post-fixing table: insert paragraph in empty cell.' );

		writer.insertElement( 'paragraph', tableCell );

		return true;
	}

	// Check table cell children for directly placed text nodes.
	// Temporary solution. See https://github.com/ckeditor/ckeditor5/issues/1464.
	const textNodes = Array.from( tableCell.getChildren() ).filter( child => child.is( '$text' ) );

	// @if CK_DEBUG_TABLE // textNodes.length && console.log( 'Post-fixing table: wrap cell content with paragraph.' );

	for ( const child of textNodes ) {
		writer.wrap( writer.createRangeOn( child ), 'paragraph' );
	}

	// Return true when there were text nodes to fix.
	return !!textNodes.length;
}

// Checks if a differ change should fix the table cell. This happens on:
// - Removing content from the table cell (i.e. `tableCell` can be left empty).
// - Adding a text node directly into a table cell.
//
// @param {Object} differ change entry
// @returns {Boolean}
function checkTableCellChange( entry ) {
	if ( !entry.position || !entry.position.parent.is( 'element', 'tableCell' ) ) {
		return false;
	}

	return entry.type == 'insert' && entry.name == '$text' || entry.type == 'remove';
}