All files filter-selector.ts

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import { IFilterOptions } from '../interfaces/IFilterOptions';

/**
 * Check if a selector should be whitelisted and / or replaced.
 */
export = function filterSelector({
  ruleSelector,
  ruleParentSelectors,
  filters,
}: IFilterOptions) {
  let newSelector = ``;
 
  filters.some((selectorFilter) => {
    const selector = selectorFilter.selector || selectorFilter;
    const replacementSelector = selectorFilter.replacement;
    const parentComparisonSelector = replacementSelector || selector;
 
    const selectorsAreEqual = selector === ruleSelector;
    const parentSelectorIsEqual = ruleParentSelectors.reduce((bool: boolean, ruleParentSelector: string) => {
      return parentComparisonSelector instanceof RegExp ?
        parentComparisonSelector.test(ruleParentSelector) :
        ruleParentSelector === parentComparisonSelector;
    }, false);
    const selectorsMatch = selector instanceof RegExp && selector.test(ruleSelector);

    if (selectorsAreEqual || parentSelectorIsEqual || selectorsMatch) {
      newSelector = replacementSelector ?
        ruleSelector.replace(selector, replacementSelector) :
        ruleSelector;
 
      // Do not stop iterating over the selector filters if the parent selector was matched
      // because child selectors may get replaced in a further iteration.
      if (!parentSelectorIsEqual) {
        return true;
      }
    }
    return false;
  });
 
  return newSelector;
};