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'use strict';

exports.type = 'perItem';

exports.active = true;

exports.description = 'removes empty <text> elements';

exports.params = {
  text: true,
  tspan: true,
  tref: true,
};

/**
 * Remove empty Text elements.
 *
 * @see https://www.w3.org/TR/SVG11/text.html
 *
 * @example
 * Remove empty text element:
 * <text/>
 *
 * Remove empty tspan element:
 * <tspan/>
 *
 * Remove tref with empty xlink:href attribute:
 * <tref xlink:href=""/>
 *
 * @param {Object} item current iteration item
 * @param {Object} params plugin params
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich
 */
exports.fn = function (item, params) {
  if (item.type === 'element') {
    // Remove empty text element
    if (params.text && item.name === 'text' && item.children.length === 0) {
      return false;
    }

    // Remove empty tspan element
    if (params.tspan && item.name === 'tspan' && item.children.length === 0) {
      return false;
    }

    // Remove tref with empty xlink:href attribute
    if (
      params.tref &&
      item.name === 'tref' &&
      item.attributes['xlink:href'] == null
    ) {
      return false;
    }
  }
};