Add support for Before hooks (without tags)

examples/javascript/features/step_definitions/fib_steps.js

@@ -14,14 +14,21 @@ var fibonacciSeries = function(fibonacciLimit) {
   return "[" + result.join(", ") + "]";
 }
 
-var fibResult;
+function assert(expected, actual){
+  if(expected != actual){
+    throw 'Expected <' + expected + "> but got <" + actual + ">";
+  }
+}
+
+Before(function(n){
+  fibResult = 0;
+});
 
 When(/^I ask Javascript to calculate fibonacci up to (\d+)$/, function(n){
+  assert(0, fibResult)
   fibResult = fibonacciSeries(parseInt(n));
 });
 
 Then(/^it should give me (\[.*\])$/, function(expectedResult){
-  if(fibResult != expectedResult){
-    throw 'Expected <' + expectedResult + "> but got <" + fibResult + ">";
-  }
+  assert(expectedResult, fibResult)
 });

lib/cucumber/js_support/js_dsl.js

@@ -17,6 +17,13 @@ var registerStepDefinition = function(regexp, func) {
   jsLanguage.addStepDefinition(this, argumentsFrom, regexp, func);
 };
 
+var beforeHook = function(func){
+  jsLanguage.registerJsHook('before', func);
+}
+
 var Given = registerStepDefinition;
 var When = registerStepDefinition;
 var Then = registerStepDefinition;
+
+var Before = beforeHook;
+

lib/cucumber/js_support/js_language.rb

@@ -36,6 +36,20 @@ def arguments_from(step_name)
       end
     end
 
+    class JsHook
+      def initialize(js_language, tag_names, proc)
+        @js_language, @tag_names, @proc = js_language, tag_names, proc
+      end
+
+      def tag_expressions
+        @tag_names
+      end
+
+      def invoke(location, scenario)
+        @js_language.current_world.eval("var block = #{@proc.ToString}; block();")
+      end
+    end
+
     class JsArg
       def initialize(arg)
         @arg = arg
@@ -88,6 +102,12 @@ def addStepDefinition(this, argumentsFrom, regexp, func)
         @step_definitions << JsStepDefinition.new(self, regexp, func)
       end
 
+      #TODO support tag_names
+      def registerJsHook(phase, proc)
+        tag_names = []
+        add_hook(phase, JsHook.new(self, tag_names, proc))
+      end
+
       def current_world
         @world
       end