SlotLanguage reborn in the Machine

Just added the compiler, that can parse Slot directly into SlotMachine code (no language layer in between)
Still unclear wheather the Maker is a thing, but since it was in the Language layer i did not remove it (yet)
Otherwise just the compiler and all the tests, moved from the slot_language.

test/slot_machine/compiler/test_equal_goto.rb

@@ -0,0 +1,83 @@
+require_relative "../helper"
+
+module SlotMachine
+  class TestEqualGoto < MiniTest::Test
+    include SlotHelper
+
+    def do_check(code)
+      check = compile(code)
+      assert_equal SameCheck , check.class
+      assert_equal Label , check.false_label.class
+      assert check.left.is_a?(Slotted)
+      assert check.right.is_a?(Slotted)
+      check
+    end
+    def test_equal_local
+      check = do_check("goto(exit_label) if(a == b)")
+      assert_equal "message.a" , check.left.to_s
+      assert_equal "message.b" , check.right.to_s
+    end
+    def test_equal_inst_left
+      check = do_check("goto(exit_label) if(@a == b)")
+      assert_equal "message.receiver.a" , check.left.to_s
+      assert_equal "message.b" , check.right.to_s
+    end
+    def test_equal_inst_right
+      check = do_check("goto(exit_label) if(a == @b)")
+      assert_equal "message.a" , check.left.to_s
+      assert_equal "message.receiver.b" , check.right.to_s
+    end
+  end
+
+  class TestEqualGotoFull < MiniTest::Test
+    include SlotHelper
+    def setup
+      @expr = compile("start_label;goto(start_label) if( b == c)")
+    end
+    def test_label
+      assert_equal SlotMachine::Label , @expr.class
+      assert_equal :start_label , @expr.name
+    end
+    def test_conditional
+      assert_equal SameCheck , @expr.last.class
+      assert_equal :start_label , @expr.last.false_label.name
+    end
+    def test_same_label
+      assert_equal @expr.object_id , @expr.next.false_label.object_id
+    end
+    def test_expression_left
+      assert_equal SlottedMessage , @expr.last.left.class
+      assert_equal "message.b" , @expr.last.left.to_s
+    end
+    def test_expression_right
+      assert_equal SlottedMessage , @expr.last.right.class
+      assert_equal "message.c" , @expr.last.right.to_s
+    end
+  end
+  class TestEqualGotoChain < MiniTest::Test
+    include SlotHelper
+    def setup
+      @expr = compile("goto(start_label) if( a.b == c)")
+    end
+    def test_eq
+      assert_equal SameCheck , @expr.class
+    end
+    def test_left
+      assert_equal SlottedMessage , @expr.left.class
+      assert_equal "message.a.b" , @expr.left.to_s
+    end
+  end
+  class TestEqualGotoChain2 < MiniTest::Test
+    include SlotHelper
+    def setup
+      @expr = compile("goto(start_label) if( a == @b.c)")
+    end
+    def test_eq
+      assert_equal SameCheck , @expr.class
+    end
+    def test_right
+      assert_equal SlottedMessage , @expr.right.class
+      assert_equal "message.receiver.b.c" , @expr.right.to_s
+    end
+  end
+end