Introduce gin_shell

gin/modules/module_registry.h

Index: gin/modules/module_registry.h
diff --git a/gin/modules/module_registry.h b/gin/modules/module_registry.h
index 7cff355963725107010cdf99994ed8e85ec32bd6..a7732c8091854261dcda24501b0362514cfb3ac8 100644
--- a/gin/modules/module_registry.h
+++ b/gin/modules/module_registry.h
@@ -6,8 +6,11 @@
 #define GIN_MODULES_MODULE_REGISTRY_H_
 
 #include <list>
+#include <set>
 #include <string>
+
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
 #include "gin/per_context_data.h"
 
 namespace gin {
@@ -27,6 +30,8 @@ struct PendingModule;
 //
 class ModuleRegistry : public ContextSupplement {
  public:
+  virtual ~ModuleRegistry();
+
   static ModuleRegistry* From(v8::Handle<v8::Context> context);
 
   static void RegisterGlobals(v8::Isolate* isolate,
@@ -37,25 +42,42 @@ class ModuleRegistry : public ContextSupplement {
                         const std::string& id,
                         v8::Handle<v8::ObjectTemplate> templ);
 
-  // Takes ownership of |pending|. The caller must have already entered
-  // our context.
-  void AddPendingModule(v8::Isolate* isolate, PendingModule* pending);
+  // The caller must have already entered our context.
+  void AddPendingModule(v8::Isolate* isolate,
+                        scoped_ptr<PendingModule> pending);
+
+  // The caller must have already entered our context.
+  void AttemptToLoadMoreModules(v8::Isolate* isolate);
+
+  const std::set<std::string>& available_modules() const {
+    return available_modules_;
+  }
+
+  const std::set<std::string>& unsatisfied_dependencies() const {
+    return unsatisfied_dependencies_;
+  }
 
  private:
-  typedef std::list<PendingModule*> PendingModuleList;  // Owning reference.
+  typedef ScopedVector<PendingModule> PendingModuleVector;
 
   explicit ModuleRegistry(v8::Isolate* isolate);
-  virtual ~ModuleRegistry();
 
   // From ContextSupplement:
   virtual void Detach(v8::Handle<v8::Context> context) OVERRIDE;
 
-  // Takes ownership of |pending|.
-  bool AttemptToLoad(v8::Isolate* isolate, PendingModule* pending);
-  void AttemptToLoadPendingModules(v8::Isolate* isolate);
+  void Load(v8::Isolate* isolate, scoped_ptr<PendingModule> pending);
+  void RegisterModule(v8::Isolate* isolate,
+                      const std::string& id,
+                      v8::Handle<v8::Value> module);
+
+  bool CheckDependencies(PendingModule* pending);
+  bool AttemptToLoad(v8::Isolate* isolate, scoped_ptr<PendingModule> pending);
+
+  std::set<std::string> available_modules_;
+  std::set<std::string> unsatisfied_dependencies_;
 
+  PendingModuleVector pending_modules_;
   v8::Persistent<v8::Object> modules_;
-  PendingModuleList pending_modules_;
 
   DISALLOW_COPY_AND_ASSIGN(ModuleRegistry);
 };