analytics/webcontent/bi/js/gemini/dashboard/util/TextScrambler.js

'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2017
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['jquery', '../../lib/@waca/core-client/js/core-client/ui/core/Class'], function ($, Class) {

	var CHARS = {
		upper: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
		lower: 'abcdefghijklmnopqrstuvwxyz',
		number: '0123456789',
		other: '!\'#$*&()%+=,-./:;<=>?@[]^_`{}|~'
	};

	// values in ms
	var timeBetweenUpdates = 25;
	var durationLowerBound = 485; // 500ms minus reasonable execution time of update function

	var numFramesUntilFullLength = 15;

	var TextScrambler = Class.extend({

		init: function init(options) {
			this.ignoreSet = options.ignoreSet;
			this.el = options.el;
			this.text = options.el.innerText;
		},

		scramble: function scramble() {
			var toScramble = this._applyIgnoreSet();
			this.queue = [];
			for (var i = 1; i <= toScramble.length; i++) {
				this.queue.push({
					char: toScramble[i - 1],
					start: Math.floor(i / this.text.length * numFramesUntilFullLength)
				});
			}
			this.frame = 0;
			this._update();
		},

		_applyIgnoreSet: function _applyIgnoreSet() {
			var text = this.text;
			if (this.ignoreSet) {
				$.each(this.ignoreSet, function (index, char) {
					text = text.replace(new RegExp('\\' + char, 'g'), '');
				});
			}
			return text;
		},

		_update: function _update(highResTimestamp) {
			if (!this.startTime && highResTimestamp) {
				this.startTime = highResTimestamp;
			}
			var output = '';
			var complete = false;
			$.each(this.queue, function (index, elem) {
				if (this.frame >= elem.start) {
					output += this._getRandomChar(elem.char);
				}
			}.bind(this));
			if (highResTimestamp - this.startTime > durationLowerBound) {
				output = this.text;
				complete = true;
			}
			this.el.innerHTML = output;
			if (!complete) {
				this.frame++;
				setTimeout(function () {
					this.frameRequest = window.requestAnimationFrame(this._update.bind(this));
				}.bind(this), timeBetweenUpdates);
			}
		},

		_getRandomChar: function _getRandomChar(oldChar) {
			if (oldChar === ' ') {
				return oldChar;
			} else if (oldChar >= '0' && oldChar <= '9') {
				return CHARS.number[Math.floor(Math.random() * CHARS.number.length)];
			} else if (oldChar >= 'A' && oldChar <= 'Z') {
				return CHARS.upper[Math.floor(Math.random() * CHARS.upper.length)];
			} else if (oldChar >= 'a' && oldChar <= 'z') {
				return CHARS.lower[Math.floor(Math.random() * CHARS.lower.length)];
			} else {
				return CHARS.other[Math.floor(Math.random() * CHARS.lower.length)];
			}
		}

	});

	return TextScrambler;
});
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