export function parseTemplate()

in packages/runtime/src/dataLoader.ts [70:131]
49 lines of code
21 McCabe index (conditional complexity)

export function parseTemplate(config: StaticDataLoader) {
  const queryParams = {};
  const getQueryParams = () => {
    if (Object.keys(queryParams).length === 0) {
      if (location.search.includes('?')) {
        location.search.substring(1).split('&').forEach(query => {
          const res = query.split('=');
          // ?test=1&hello=world
          if (res[0] !== undefined && res[1] !== undefined) {
            queryParams[res[0]] = res[1];
          }
        });
      }
    }

    return queryParams;
  };

  const cookie = {};
  const getCookie = () => {
    if (Object.keys(cookie).length === 0) {
      document.cookie.split(';').forEach(c => {
        const [key, value] = c.split('=');
        if (key !== undefined && value !== undefined) {
          cookie[key.trim()] = value.trim();
        }
      });
    }

    return cookie;
  };

  // Match all template of query cookie and storage.
  let strConfig = JSON.stringify(config) || '';
  const regexp = /\$\{(queryParams|cookie|storage)(\.(\w|-)+)?}/g;
  let cap = [];
  let matched = [];
  while ((cap = regexp.exec(strConfig)) !== null) {
    matched.push(cap);
  }

  matched.forEach(item => {
    const [origin, key, value] = item;
    if (item && origin && key && value && value.startsWith('.')) {
      if (key === 'queryParams') {
        // Replace query params.
        strConfig = strConfig.replace(origin, getQueryParams()[value.substring(1)] || '');
      } else if (key === 'cookie') {
        // Replace cookie.
        strConfig = strConfig.replace(origin, getCookie()[value.substring(1)] || '');
      } else if (key === 'storage') {
        // Replace storage.
        strConfig = strConfig.replace(origin, localStorage.getItem(value.substring(1)) || '');
      }
    }
  });

  // Replace url.
  strConfig = strConfig.replace('${url}', location.href);

  return JSON.parse(strConfig);
}