Creating a color swatch legend in Illustrator

I've been looking for scripts online that would create a color swatch legend to list the colors used in my illustrator file.  I found this (see below) and tweaked it to place properly on my particular page, but it adds everything in my swatches panel to the legend.  Ideally, I'm looking for a piece of script to add that would only add used swatches to the legend, or a script that would only add spot colors to the legend.  I'm a scripting novice, so any help is much appreciated...

var docRef=app.activeDocument;

var SwatchBoxSize=24;

var swatchBoxSize=parseFloat(SwatchBoxSize);

var swatchBoxTop=swatchBoxSize+314;

//Loop through the members of the document's inkList.

for(i=docRef.swatches.length-1;i>=0;i--){

          var swatchRef=docRef.swatches;

          var swatchRefName=docRef.swatches.name;

          var swatchBox=docRef.pathItems.rectangle(swatchBoxTop, 24, 43, 14);

          swatchBox.fillColor=swatchRef.color;

          swatchBox.stroked=true;

          var swatchLabelX= swatchBox.left+swatchBox.width+6;

          var swatchLabelY = swatchBoxTop-(swatchBox.height/2);

          var swatchLabel = docRef.textFrames.pointText([swatchLabelX,swatchLabelY]);

          swatchLabel.contents = swatchRefName;

          swatchLabel.textRange.characterAttributes.size=swatchBoxSize/3;

          swatchLabel.textRange.characterAttributes.leading=swatchBoxSize/ 3;

          swatchLabel.textRange.characterAttributes.fillColor=docRef.swatches["[Registration]"].color;

          swatchBoxTop+=(swatchBoxSize*.7);

}//end for