fixed cartocss with single quoted strings

lib/carto/tree/filterset.js

@@ -92,7 +92,7 @@ tree.Filterset.prototype.toJS = function(env) {
       val = filter._val.toString(true);
     }
     var attrs = "data";
-    return attrs + "." + filter.key.value  + " " + op + " " + (val.is === 'string' ? "'"+ val +"'" : val);
+    return attrs + "." + filter.key.value  + " " + op + " " + (val.is === 'string' ? "'" + val.toString().replace(/'/g, "\\'") + "'" : val);
   }).join(' && ');
 };
 

test/rendering_js.test.js

@@ -129,7 +129,14 @@ describe('RenderingJS', function() {
     shader = (new carto.RendererJS({ debug: true })).render(style);
     layer0 = shader.getLayers()[0];
     assert(layer0.isVariable());
+  });
 
+  it("should parse styles with string", function() {
+    var style = '#test { [column = "test\'ing"] { marker-width: 10; } }';
+    var shader = (new carto.RendererJS({ debug: true })).render(style);
+    var layer = shader.getLayers()[0];
+    var props = layer.getStyle({column: 'test\'ing'}, {  'zoom': 0, 'frame-offset': 10 });
+    assert(props['marker-width'] ===  10);
   });
 
 });