react-textfit/lib/utils/whilst.js

React component to fit headlines and paragraphs into any element

"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = whilst;
var noop = function noop() {};

/**
 * Repeatedly call fn, while test returns true. Calls callback when stopped, or an error occurs.
 *
 * @param {Function} test Synchronous truth test to perform before each execution of fn.
 * @param {Function} fn A function which is called each time test passes. The function is passed a callback(err), which must be called once it has completed with an optional err argument.
 * @param {Function} callback A callback which is called after the test fails and repeated execution of fn has stopped.
 */

function whilst(test, iterator) {
    var callback = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : noop;

    if (test()) {
        iterator(function next(err) {
            for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
                args[_key - 1] = arguments[_key];
            }

            if (err) {
                callback(err);
            } else if (test.apply(this, args)) {
                iterator(next);
            } else {
                callback(null);
            }
        });
    } else {
        callback(null);
    }
}