@wordpress/hooks/build/createAddHook.js

WordPress hooks library.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _validateNamespace = _interopRequireDefault(require("./validateNamespace.js"));
var _validateHookName = _interopRequireDefault(require("./validateHookName.js"));
/**
 * Internal dependencies
 */

/**
 * @callback AddHook
 *
 * Adds the hook to the appropriate hooks container.
 *
 * @param {string}               hookName      Name of hook to add
 * @param {string}               namespace     The unique namespace identifying the callback in the form `vendor/plugin/function`.
 * @param {import('.').Callback} callback      Function to call when the hook is run
 * @param {number}               [priority=10] Priority of this hook
 */

/**
 * Returns a function which, when invoked, will add a hook.
 *
 * @param {import('.').Hooks}    hooks    Hooks instance.
 * @param {import('.').StoreKey} storeKey
 *
 * @return {AddHook} Function that adds a new hook.
 */
function createAddHook(hooks, storeKey) {
  return function addHook(hookName, namespace, callback, priority = 10) {
    const hooksStore = hooks[storeKey];
    if (!(0, _validateHookName.default)(hookName)) {
      return;
    }
    if (!(0, _validateNamespace.default)(namespace)) {
      return;
    }
    if ('function' !== typeof callback) {
      // eslint-disable-next-line no-console
      console.error('The hook callback must be a function.');
      return;
    }

    // Validate numeric priority
    if ('number' !== typeof priority) {
      // eslint-disable-next-line no-console
      console.error('If specified, the hook priority must be a number.');
      return;
    }
    const handler = {
      callback,
      priority,
      namespace
    };
    if (hooksStore[hookName]) {
      // Find the correct insert index of the new hook.
      const handlers = hooksStore[hookName].handlers;

      /** @type {number} */
      let i;
      for (i = handlers.length; i > 0; i--) {
        if (priority >= handlers[i - 1].priority) {
          break;
        }
      }
      if (i === handlers.length) {
        // If append, operate via direct assignment.
        handlers[i] = handler;
      } else {
        // Otherwise, insert before index via splice.
        handlers.splice(i, 0, handler);
      }

      // We may also be currently executing this hook.  If the callback
      // we're adding would come after the current callback, there's no
      // problem; otherwise we need to increase the execution index of
      // any other runs by 1 to account for the added element.
      hooksStore.__current.forEach(hookInfo => {
        if (hookInfo.name === hookName && hookInfo.currentIndex >= i) {
          hookInfo.currentIndex++;
        }
      });
    } else {
      // This is the first hook of its type.
      hooksStore[hookName] = {
        handlers: [handler],
        runs: 0
      };
    }
    if (hookName !== 'hookAdded') {
      hooks.doAction('hookAdded', hookName, namespace, callback, priority);
    }
  };
}
var _default = exports.default = createAddHook;
//# sourceMappingURL=createAddHook.js.map