Add define module support

features/module.feature

@@ -0,0 +1,10 @@
+Feature: Module
+ Scenario: I can define a Module
+ When I execute ruby code:
+ """
+ module Generic
+ end
+ Generic
+ """
+ Then there should return object
+ And there should return module "Generic"

module.go

@@ -10,6 +10,10 @@ func (mrb *State) DefineModuleId(name Symbol) RClass {
  return defineModule(mrb, name, mrb.ObjectClass)
 }
 
+func (mrb *State) vmDefineModule(outer RClass, name Symbol) RClass {
+ return defineModule(mrb, name, outer)
+}
+
 func defineModule(mrb *State, name Symbol, outer RClass) *Module {
  module := mrb.AllocModule()
  module.mt = make(methodTable)

vm.go

@@ -318,6 +318,18 @@ func (mrb *State) VmExec(proc RProc, code *insn.Sequence) (ret Value, err error)
  }
 
  ctx.Set(int(a), NewObjectValue(class))
+ case op.Module:
+ a := code.ReadB()
+ b := code.ReadB()
+
+ id := rep.Symbol(b)
+ base, ok := ctx.Get(int(a)).(RClass)
+ if !ok {
+ base = mrb.ObjectClass
+ }
+
+ module := mrb.vmDefineModule(base, id)
+ ctx.Set(int(a), NewObjectValue(module))
  case op.Method:
  a := code.ReadB()
  b := code.ReadB()