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'use strict';

const { closestByName } = require('../lib/xast.js');

exports.type = 'perItem';

exports.active = true;

exports.description = 'removes viewBox attribute when possible';

const viewBoxElems = ['svg', 'pattern', 'symbol'];

/**
 * Remove viewBox attr which coincides with a width/height box.
 *
 * @see https://www.w3.org/TR/SVG11/coords.html#ViewBoxAttribute
 *
 * @example
 * <svg width="100" height="50" viewBox="0 0 100 50">
 *             ⬇
 * <svg width="100" height="50">
 *
 * @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' &&
    viewBoxElems.includes(item.name) &&
    item.attributes.viewBox != null &&
    item.attributes.width != null &&
    item.attributes.height != null
  ) {
    // TODO remove width/height for such case instead
    if (item.name === 'svg' && closestByName(item.parentNode, 'svg')) {
      return;
    }

    const nums = item.attributes.viewBox.split(/[ ,]+/g);

    if (
      nums[0] === '0' &&
      nums[1] === '0' &&
      item.attributes.width.replace(/px$/, '') === nums[2] && // could use parseFloat too
      item.attributes.height.replace(/px$/, '') === nums[3]
    ) {
      delete item.attributes.viewBox;
    }
  }
};