'use strict';
const { elemsGroups } = require('./_collections');
exports.name = 'removeEmptyContainers';
exports.type = 'perItemReverse';
exports.active = true;
exports.description = 'removes empty container elements';
/**
* Remove empty containers.
*
* @see https://www.w3.org/TR/SVG11/intro.html#TermContainerElement
*
* @example
*
*
* @example
*
*
* @param {Object} item current iteration item
* @return {Boolean} if false, item will be filtered out
*
* @author Kir Belevich
*/
exports.fn = function (item) {
if (item.type === 'element') {
return (
item.children.length !== 0 ||
elemsGroups.container.includes(item.name) === false ||
item.name === 'svg' ||
// empty patterns may contain reusable configuration
(item.name === 'pattern' && Object.keys(item.attributes).length !== 0) ||
// The 'g' may not have content, but the filter may cause a rectangle
// to be created and filled with pattern.
(item.name === 'g' && item.attributes.filter != null) ||
// empty hides masked element
(item.name === 'mask' && item.attributes.id != null)
);
}
return true;
};