[api] Overloaded kyuri.compile to take an AST or source Gherkin text

lib/kyuri.js

@@ -13,7 +13,6 @@ var kyuri = exports;
 kyuri.version = '0.0.1';
 kyuri.compile     = require('kyuri/core').compile;
 kyuri.parse       = require('kyuri/core').parse;
-kyuri.parseAST    = require('kyuri/core').parseAST;
 kyuri.tokens      = require('kyuri/core').tokens;
 kyuri.nodes       = require('kyuri/core').nodes;
 kyuri.setLanguage = require('kyuri/core').setLanguage;

lib/kyuri/core.js

@@ -11,16 +11,20 @@
 
 var i18n = require('./i18n').i18n,
     Lexer = require('./lexer').Lexer,
-    Parser = require('./parser').Parser;
+    Parser = require('./parser').Parser,
+    Generator = require('./generator').Generator;
 
 var core = exports,
     parser = new Parser(),
     lexer = new Lexer('en', i18n);
 
 exports.compile = function (code, options) {
+  var isText = typeof code === 'string', generator;
   options = options || {};
+
   try {
-    return (parser.parse(lexer.tokenize(code))).compile(options);
+    generator = isText ? parser.parse(lexer.tokenize(code)) : new (Generator)(code);
+    return generator.compile(options);
   }
   catch (err) {
     if (options.fileName) {
@@ -30,10 +34,6 @@ exports.compile = function (code, options) {
   }
 };
 
-exports.parseAST = function (ast) {
-  return parser.parse(ast);
-};
-
 exports.parse = function (code) {
   return parser.parse(lexer.tokenize(code));
 };