node_modules/svgo/plugins/mergePaths.js

'use strict';

const { computeStyle } = require('../lib/style.js');
const { path2js, js2path, intersects } = require('./_path.js');

exports.type = 'perItem';

exports.active = true;

exports.description = 'merges multiple paths in one if possible';

exports.params = {
  collapseRepeated: true,
  force: false,
  leadingZero: true,
  negativeExtraSpace: true,
  noSpaceAfterFlags: false, // a20 60 45 0 1 30 20 → a20 60 45 0130 20
};

/**
 * Merge multiple Paths into one.
 *
 * @param {Object} item current iteration item
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich, Lev Solntsev
 */
exports.fn = function (item, params) {
  if (item.type !== 'element' || item.children.length === 0) return;

  let prevContentItem = null;
  let prevContentItemKeys = null;

  item.children = item.children.filter(function (contentItem) {
    if (
      prevContentItem &&
      prevContentItem.isElem('path') &&
      prevContentItem.children.length === 0 &&
      prevContentItem.attributes.d != null &&
      contentItem.isElem('path') &&
      contentItem.children.length === 0 &&
      contentItem.attributes.d != null
    ) {
      const computedStyle = computeStyle(contentItem);
      // keep path to not break markers
      if (
        computedStyle['marker-start'] ||
        computedStyle['marker-mid'] ||
        computedStyle['marker-end']
      ) {
        return true;
      }
      if (!prevContentItemKeys) {
        prevContentItemKeys = Object.keys(prevContentItem.attributes);
      }

      const contentItemAttrs = Object.keys(contentItem.attributes);
      const equalData =
        prevContentItemKeys.length == contentItemAttrs.length &&
        contentItemAttrs.every(function (key) {
          return (
            key == 'd' ||
            (prevContentItem.attributes[key] != null &&
              prevContentItem.attributes[key] == contentItem.attributes[key])
          );
        });
      const prevPathJS = path2js(prevContentItem);
      const curPathJS = path2js(contentItem);

      if (equalData && (params.force || !intersects(prevPathJS, curPathJS))) {
        js2path(prevContentItem, prevPathJS.concat(curPathJS), params);
        return false;
      }
    }

    prevContentItem = contentItem;
    prevContentItemKeys = null;
    return true;
  });
};