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'use strict';

exports.type = 'perItemReverse';

exports.active = true;

exports.description = 'removes empty container elements';

var container = require('./_collections').elemsGroups.container;

/**
 * Remove empty containers.
 *
 * @see http://www.w3.org/TR/SVG/intro.html#TermContainerElement
 *
 * @example
 * <defs/>
 *
 * @example
 * <g><marker><a/></marker></g>
 *
 * @param {Object} item current iteration item
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich
 */
exports.fn = function(item) {

    return !(item.isElem(container) && !item.isElem('svg') && item.isEmpty() &&
        (!item.isElem('pattern') || !item.hasAttrLocal('href')));

};