Reddit comment colorizer

By Jared McAteer — Last update Jan 16, 2009 — Installed 76 times.
There are 1 previous version of this script.
// ==UserScript==
// @namespace		http://greasemonkey.jaredmcateer.com
// @name          	Reddit comment colorizer
// @description   	Colors reddit comments based on score. Based on script by same name available at http://userscripts.org/scripts/show/39608. Added some configuration options; if the background color (Default: Green) is not to your liking as well as the ability to choose whether to include the article's score in the tally (Default: Don't include)
// @include       	http://*.reddit.com/*comments/*
// @version       	0.1a
// ==/UserScript==

/*global document*/
(function() {
	/*CONFIG VALUES
	*
	*	The following values can be adjusted to achieve different colors and effects
	*
	*/
	var defaults = {
		"includeArticleScore" : false, //If true it will include the articles score, along with comments
		"hue" : 0.3, //Hue. Float from 0.0 to 1.0
		"value" : 1 //Brightness of hue. float from 0.0 to 1.0 - 1 = full hue color, 0 = black
	};
	/*END CONFIG*/
	
    //from http://www.robertnyman.com/2005/11/07/the-ultimate-getelementsbyclassname/
    function getElementsByClassName(oElm, strTagName, strClassName){
        /*
            Written by Jonathan Snook, http://www.snook.ca/jonathan
            Add-ons by Robert Nyman, http://www.robertnyman.com
        */
        var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName),
			arrReturnElements = [],
			oRegExp = new RegExp("(^|\\s)" + strClassName.replace(/\-/g, "\\-") + "(\\s|$)"),
			oElement,
			i=0;
			
        for(i=0; i<arrElements.length; i++){
            oElement = arrElements[i];
            if(oRegExp.test(oElement.className)){
                arrReturnElements.push(oElement);
            }
        }
        return (arrReturnElements);
    }

    //from http://jsres.blogspot.com/2008/01/convert-hsv-to-rgb-equivalent.html
    function hsv2rgb(h,s,v) {
        // Adapted from http://www.easyrgb.com/math.html
        // hsv values = 0 - 1, rgb values = 0 - 255
        var r, g, b, 
			RGB = [],
			var_h, var_i, var_1, var_2,	var_3,
			var_r, var_g, var_b;
        if(s===0){
          RGB.red = RGB.green = RGB.blue = Math.round(v*255);
        }else{
          // h must be < 1
          var_h = h * 6;
          if (var_h===6){ var_h = 0; }
          //Or ... var_i = floor( var_h )
          var_i = Math.floor( var_h );
          var_1 = v*(1-s);
          var_2 = v*(1-s*(var_h-var_i));
          var_3 = v*(1-s*(1-(var_h-var_i)));
          if(var_i===0){
            var_r = v;
            var_g = var_3;
            var_b = var_1;
          }else if(var_i===1){
            var_r = var_2;
            var_g = v;
            var_b = var_1;
          }else if(var_i===2){
            var_r = var_1;
            var_g = v;
            var_b = var_3;
          }else if(var_i===3){
            var_r = var_1;
            var_g = var_2;
            var_b = v;
          }else if (var_i===4){
            var_r = var_3;
            var_g = var_1;
            var_b = v;
          }else{
            var_r = v;
            var_g = var_1;
            var_b = var_2;
          }
          //rgb results = 0 - 255
          RGB.red=Math.round(var_r * 255);
          RGB.green=Math.round(var_g * 255);
          RGB.blue=Math.round(var_b * 255);
		}
        return RGB;
    }

    //from http://www.csgnetwork.com/csgcolorsel4.html
    function hexify(number) {
        var digits = '0123456789ABCDEF',
			lsd = number % 16,
			msd = (number - lsd) / 16,
			hexified = digits.charAt(msd) + digits.charAt(lsd);
        return hexified;
    }



    function hsv2rgbString(h,s,v) {
        var rgb = hsv2rgb(h,s,v);
        return "#"+hexify(rgb.red)+"" +hexify(rgb.green)+"" +hexify(rgb.blue);
    }

    function isValidScore(scoreSpan) {
        return scoreSpan.innerHTML.split(" ")[1] == "points";

    }

    function score(scoreSpan)  {
        function getScore() {
            if(isValidScore(scoreSpan)) {
                var score = parseInt(scoreSpan.innerHTML.split(" ")[0],10);
                return score > 0 ? score : 0;
            }
            return -1;
        }

        this.span = scoreSpan;
        //this.scoreBackground;
        this.points = getScore();

        this.setBackgroundColor = function(color) {
            this.span.style.backgroundColor = color;
        };
    }

    function scores() {
		var i = 0;
		this.allScoreSpans = getElementsByClassName(document, "span", "score");

        this.allScores = [];
        for(i=0; i<this.allScoreSpans.length; i++) {
            if(isValidScore(this.allScoreSpans[i])) {
                this.allScores.push(new score(this.allScoreSpans[i]));
            }
        }


        this.getMaximumScore = function() {
            var max = -1, 
				i = 0,
				c,
				start = defaults.inclueArticleScore ? 0 : 1;
            for(i = start; i<this.allScores.length; i++) {
                c = this.allScores[i];
                if(c.points > max) {
                    max = c.points;
                }
            }
            return max;
        };
    }

    var commentScores = new scores(),
		maxScore = commentScores.getMaximumScore(),
		s,
		start = defaults.includeArticleScore ? 0 : 1;
    for(var i = start; i< commentScores.allScores.length;i++) {
        s = commentScores.allScores[i];
        s.setBackgroundColor(hsv2rgbString(defaults.hue,s.points/maxScore,defaults.value));

    }

})();