First thoughts about how it should work

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "gradient-parser",
+  "version": "0.0.0",
+  "description": "Parse gradient definitions and return AST.",
+  "main": "./parser.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/rafaelcaricio/gradient-parser.git"
+  },
+  "keywords": [
+    "parser",
+    "gradient",
+    "css",
+    "ast"
+  ],
+  "author": "Rafael Caricio <rafael@caricio.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/rafaelcaricio/gradient-parser/issues"
+  },
+  "homepage": "https://github.com/rafaelcaricio/gradient-parser"
+}

parser.js

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+// Copyright (c) 2014 Rafael Caricio. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var Parser = (function() {
+
+  var types = {
+    gradients: [
+      'linear-gradient',
+      'radial-gradient',
+      'repeating-radial-gradient'
+    ],
+    colors: [
+      'hex',
+      'rgb',
+      'rgba',
+      'hsl',
+      'literal'
+    ]
+  };
+
+  function Constructor() {
+  }
+
+  Constructor.prototype.parse = function(input) {
+    return null;
+  }
+
+  return Constructor;
+})();
+
+
+var p = new Parser('linear-gradient(to right, transparent 10px, #c2c2c2 10px)');
+var ast = p.parse();
+
+if (ast == [
+  {
+    type: 'linear-gradient',
+    orientation: {
+      type: 'directional',
+      value: 'right'
+    },
+    colorStops: [
+      {
+        type: 'literal',
+        value: 'transparent',
+        length: {
+          value: '10',
+          type: 'px'
+        }
+      },
+      {
+        type: 'hex',
+        value: 'c2c2c2',
+        length: {
+          value: '10',
+          type: 'px'
+        }
+      }
+    ]
+  }]) {
+  console.log('Done!');
+} else {
+  console.log('Keep working...');
+}