gets icon filenames via regex

lib/torque/renderer/point.js

@@ -83,6 +83,8 @@ var carto = global.carto || require('carto');
     //
     setCartoCSS: function(cartocss) {
       // clean sprites
+      this._getIcons(cartocss);
+      console.log(this._iconNames);
       this.setShader(new carto.RendererJS().render(cartocss));
     },
 
@@ -256,6 +258,17 @@ var carto = global.carto || require('carto');
       }
       return positions;
     },
+    _getIcons: function(cartocss){
+      var re = /marker-file.*\)/g; 
+      this._iconNames = cartocss.match(re).map(function(element){
+        element = element.replace("url(", "")
+               .replace(")", "")
+               .replace(";", "")
+               .replace("marker-file:", "")
+               .trim();
+        return element;
+      });
+    },
 
     // return the value for x, y (tile coordinates)
     // null for no value
@@ -292,7 +305,7 @@ var carto = global.carto || require('carto');
       return null;
     }
 
-  };
+  });
 
 
   // exports public api