fix the if syntax and branches

lib/interpreter/interpreter.rb

@@ -103,14 +103,16 @@ module Interpreter
     end
 
     def execute_IsZero
-      #puts @instruction.inspect
-      if( @flags[:zero] )
-        target = @instruction.block
-        set_block target
-        return false
-      else
-        return true
-      end
+       @flags[:zero] ?  execute_Branch : true
+    end
+    def execute_IsNotzero
+       @flags[:zero] ? true : execute_Branch
+    end
+    def execute_IsPlus
+       @flags[:plus] ?  execute_Branch : true
+    end
+    def execute_IsMinus
+       @flags[:minus] ?  execute_Branch : true
     end
 
     def execute_LoadConstant

lib/phisol/compiler/if_statement.rb

@@ -13,9 +13,8 @@ module Phisol
       false_block = @method.source.new_block "if_false"    # directly next in order, ie if we don't jump we land here
 
       is = process(condition)
-      # TODO should/will use different branches for different conditions.
-      # just a scetch : cond_val = cond_val.is_true?(method) unless cond_val.is_a? BranchCondition
-      @method.source.add_code Register::IsZero.new( condition , true_block )
+      branch_class = Object.const_get "Register::Is#{branch_type.capitalize}"
+      @method.source.add_code branch_class.new( condition , true_block )
 
       # compile the true block (as we think of it first, even it is second in sequential order)
       @method.source.current true_block