adds parser support for arrays and also updates reference to add "ramp" function

lib/carto/parser.js

@@ -477,6 +477,7 @@ carto.Parser = function Parser(env) {
                         return new tree.Dimension(value[1], value[2], memo);
                     }
                 }
+
             },
 
             // The variable part of a variable definition.
@@ -725,10 +726,22 @@ carto.Parser = function Parser(env) {
             },
             // A sub-expression, contained by parenthensis
             sub: function() {
-                var e;
+                var e, expressions = [];
 
-                if ($('(') && (e = $(this.expression)) && $(')')) {
-                    return e;
+                if ($('(')) {
+                  while (e = $(this.expression)) {
+                      expressions.push(e);
+                      if (! $(',')) { break; }
+                  }
+                  $(')');
+                }
+
+                if (expressions.length > 1) {
+                    return new tree.Value(expressions.map(function(e) {
+                        return e.value[0];
+                    }));
+                } else if (expressions.length === 1) {
+                    return new tree.Value(expressions);
                 }
             },
             // This is a misnomer because it actually handles multiplication

lib/carto/torque-reference.js

@@ -166,7 +166,8 @@ var _mapnik_reference_latest = {
                     ["sharpen", 0],
                     ["colorize-alpha", -1],
                     ["color-to-alpha", 1],
-                    ["scale-hsla", 8]
+                    ["scale-hsla", 8],
+                    ["ramp", -1]
                 ],
                 "doc": "A list of image filters."
             },

test/reference.js

@@ -54,7 +54,8 @@ var _mapnik_reference_latest = {
                     ["x-gradient", 0],
                     ["y-gradient", 0],
                     ["invert", 0],
-                    ["sharpen", 0]
+                    ["sharpen", 0],
+                    ["ramp", 0]
                 ],
                 "doc": "A list of image filters."
             },

test/rendering_js.test.js

@@ -149,4 +149,21 @@ describe('RenderingJS', function() {
     assert.equal(emptyFilterProps['marker-width'], null);
   });
 
+  it ("should parse turbocarto", function(){
+    var css = [
+          '#layer {',
+          '  marker-width: ramp([cartodb_id], (#fff, #bbb), jenks);',
+          '}'
+      ].join('\n');
+      var shader = (new carto.RendererJS({ debug: true })).render(css);
+      var layer = shader.getLayers()[0];
+      var st = layer.shader['marker-width'].style({}, {zoom: 1})
+      assert.equal(st.name, "ramp")
+      assert.equal(st.args.length, 3);
+      assert.equal(st.args[1].value[0].rgb[0], 255);
+      assert.equal(st.args[1].value[0].rgb[1], 255);
+      assert.equal(st.args[1].value[0].rgb[2], 255);
+      assert.equal(st.args[2].value, 'jenks');
+  })
+
 });