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'use strict';
const { detachNodeFromParent } = require('../lib/xast.js');
const { elemsGroups } = require('./_collections.js');
exports.name = 'removeEmptyContainers';
exports.description = 'removes empty container elements';
/**
* Remove empty containers.
*
* @see https://www.w3.org/TR/SVG11/intro.html#TermContainerElement
*
* @example
* <defs/>
*
* @example
* <g><marker><a/></marker></g>
*
* @author Kir Belevich
*
* @type {import('./plugins-types').Plugin<'removeEmptyContainers'>}
*/
exports.fn = () => {
return {
element: {
exit: (node, parentNode) => {
// remove only empty non-svg containers
if (
node.name === 'svg' ||
elemsGroups.container.includes(node.name) === false ||
node.children.length !== 0
) {
return;
}
// empty patterns may contain reusable configuration
if (
node.name === 'pattern' &&
Object.keys(node.attributes).length !== 0
) {
return;
}
// The <g> may not have content, but the filter may cause a rectangle
// to be created and filled with pattern.
if (node.name === 'g' && node.attributes.filter != null) {
return;
}
// empty <mask> hides masked element
if (node.name === 'mask' && node.attributes.id != null) {
return;
}
detachNodeFromParent(node, parentNode);
},
},
};
};