@wordpress/data/build/redux-store/metadata/utils.js

Data module for WordPress.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.onSubKey = void 0;
exports.selectorArgsToStateKey = selectorArgsToStateKey;
/**
 * External dependencies
 */

/**
 * Higher-order reducer creator which creates a combined reducer object, keyed
 * by a property on the action object.
 *
 * @param actionProperty Action property by which to key object.
 * @return Higher-order reducer.
 */
const onSubKey = actionProperty => reducer => (state = {}, action) => {
  // Retrieve subkey from action. Do not track if undefined; useful for cases
  // where reducer is scoped by action shape.
  const key = action[actionProperty];
  if (key === undefined) {
    return state;
  }

  // Avoid updating state if unchanged. Note that this also accounts for a
  // reducer which returns undefined on a key which is not yet tracked.
  const nextKeyState = reducer(state[key], action);
  if (nextKeyState === state[key]) {
    return state;
  }
  return {
    ...state,
    [key]: nextKeyState
  };
};

/**
 * Normalize selector argument array by defaulting `undefined` value to an empty array
 * and removing trailing `undefined` values.
 *
 * @param args Selector argument array
 * @return Normalized state key array
 */
exports.onSubKey = onSubKey;
function selectorArgsToStateKey(args) {
  if (args === undefined || args === null) {
    return [];
  }
  const len = args.length;
  let idx = len;
  while (idx > 0 && args[idx - 1] === undefined) {
    idx--;
  }
  return idx === len ? args : args.slice(0, idx);
}
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