rules.js

  1. /**
  2.  * Rules
  3.  * @namespace rules
  4.  * @since 1.0.0
  5.  * @note rules are 100% tested from PredicateCore.test.js
  6.  */
  8. module.exports = {
  9.   /**
  10.    * @param {CompoundPredicate} root      root predicate
  11.    * @param {Predicate} predicateToRemove predicate to remove
  12.    * @return {boolean} true if the predicate to remove is the root predicate
  13.    * @memberof rules
  14.    */
  15.   predicateToRemoveIsRootPredicate: (root, predicateToRemove) => {
  16.     return root === predicateToRemove;
  17.   },
  19.   /**
  20.    * @param {CompoundPredicate} root      root predicate
  21.    * @param {Predicate} predicateToRemove predicate to remove
  22.    * @param {Function} CompoundPredicate CompoundPredicate constructor function
  23.    * @param {Function} ComparisonPredicate ComparisonPredicate constructor function
  24.    * @return {boolean} true if the predicate to remove is the last ComparisonPredicate
  25.    * @memberof rules
  26.    */
  27.   predicateToRemoveIsTheLastComparisonPredicate: (
  28.     root,
  29.     CompoundPredicate,
  30.     ComparisonPredicate
  31.   ) => {
  32.     const comparisonPredicateCount = CompoundPredicate.reduce(
  33.       root,
  34.       (acc, el) => (ComparisonPredicate.is(el) ? acc + 1 : acc),
  35.       0
  36.     );
  38.     return comparisonPredicateCount === 1;
  39.   },
  40. };