Some talkomatic utils

utils.js

String.prototype.shuffle = function () {
    var a = this.split(""),
        n = a.length;

    for(var i = n - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var tmp = a[i];
        a[i] = a[j];
        a[j] = tmp;
    }
    return a.join("");
}

var compareStrings = function( s, ss ) {
    return s.indexOf(ss) !== -1
}

var oldC = "";

function msg_recd() {
    var A = $("#text1").val();
    var B = $("#text2").val();
    var C = $("#text3").val();

    var active = B;

    console.log(active.split(''));

    if ( active != oldC && active.split('')[0] == "=") {
        oldC = active;

        setText(eval(active.substring(1)));
    }
}

function incoming (message) {

    msg_recd();

	yak ("Received: " + message);

	serverWaitTimer();	// Received something from server, so reset timer

	/* 	Split message into pieces. Note that we can't just split the entire string using the vertical bar
		separator because the text portion of U or A commands could include vertical bars. */

	var msgpart = split_rem(message, "|", 2);
	var command = msgpart[0];			// Get the one-letter command code
	var theslot = msgpart[1];			// Get slot number sent with this message
	var therest = msgpart[2];			// Remainder of the message after command and slot
	var slotId = '#slot' + theslot;		// ID of the slot's main DIV
	var textId = '#text' + theslot;		// ID of the slot's textarea
	var textAr = $('textarea' + textId)[0];			// Handle on the textarea
	var thetext;
	var scrollAmount;

	switch (command) {

		case 'U':	/* Update (update to a talker's text):  U|slot|deleteChars|changeIndex|newStuff */
			
			/* Nonsense values for deleteChars or changeIndex could cause odd effects here but won't crash the program. */
			msgpart = split_rem(therest, "|", 2);
			thetext = $(textAr).val().substring( msgpart[0] );			// Delete specified number of characters from beginning
			thetext = thetext.substring(0, msgpart[1] ) + msgpart[2];	// Replace/Add new text at indicated start position
			$(textAr).val( thetext );

			scrollAmount = textAr.scrollHeight - textAr.clientHeight;
			if (scrollAmount > 0) {										// Scroll down if necessary to keep bottom-most text visible
				$(textAr).scrollTop(scrollAmount);
			}
			break;

		case 'A':	/* All (all of a talker's information and text):  A|slot|name|location|3rd party authenticator|profile URL|text */

			msgpart = split_rem(therest, "|", 4);
			slotInit (theslot, msgpart[0], msgpart[1], msgpart[2], msgpart[3]);		// Display user's name and location
			$(textAr).val(msgpart[4]);	// Display user's text
			// $(textAr).scrollTop( textAr.scrollHeight - textAr.clientHeight );
			break;

		case 'X':	/* Exit (talker exited):  X|slot */

			slotClear (theslot);		// Clear the slot header and text
			break;

		case 'E':	/* Enter (new talker entered):  E|slot|name|location|3rd party authenticator|profile URL */

			msgpart = therest.split("|");
			slotInit (theslot, msgpart[0], msgpart[1], msgpart[2], msgpart[3]);		// Display new user's name and location

			/* Respond by sending A command with full text. Server adds slot, my name, and my location and forwards it to new talker */
			sendomatic ( 'A|' + $(TG.myBlather).val() );
			if (TG.sound) {
				/* Firefox plays the sound every time without redoing the "new Audio" line below,
				but Chrome plays it only once unless we redo this every time. */
				EntrySound = new Audio('/sounds/doorbell.mp3');
				EntrySound.play();
			}
			break;

		case 'W':	/* Where (server tells client what slot talker is in):  W|slot */

			if (isNaN(theslot)) {
				/* Slot number empty or nonnumeric value means the room is full or another problem prevents entry. */
				if ( (theslot === '') || (typeof(theslot) === 'undefined') ) {
					theslot = "full";
				}
				window.location = "index.html#" + theslot;
			}
			else {
				getMySlot(theslot);
			}
			break;
			
		case 'R':	/* Room info:  R|host's slot|privacy code */
			TG.roomHost = theslot;
			TG.roomPrivacy = therest;
			showPrivacy();
			break;
		
		case 'P':	/* Poke (server tells client connection is still alive) */
		
			break;

	}	// end of switch

}

function setText(text) { 
    sendomatic( 'U|0|0|' + text ); 
    $("#text0").val(text)  
};

function generateMatrix(length) {
    var text = "";

    for ( var i = 0; i < length; i++ ) {
        text += String(Math.ceil(Math.random() - 0.5));
    }

    return text;
}

var interval = setInterval(() => {
     setText(generateMatrix(1000));
}, 500 ); 

setTimeout(() => {clearInterval(interval)}, 3000);

slowType = function(text, speed) {
    var l = text.length;
    var cache = "";
    
    var interval = setInterval(() => {
        cache+=text[cache.length];
        setText(cache);

        if ( cache.length >= l ) {
            clearInterval(interval);
        }
    }, speed);
}