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instructions.py

@@ -1,24 +1,45 @@
 from abc import abstractmethod
-from typing import Dict
+from typing import Any, Dict, Optional
 
-from .artifact import Artifact
 from .collections import ListCollection
+from .dataclass import NonPositionalField
+from .operator import StreamInstanceOperator
 
 
-class Instruction(Artifact):
+class Instruction(StreamInstanceOperator):
+    """The role of instruction is to add instruction to every instance.
+
+    Meaning the instruction is taking the instance and generating instruction field for it.
+    """
+
+    skip_rendered_instance: bool = NonPositionalField(default=True)
+
+    def process(
+        self, instance: Dict[str, Any], stream_name: Optional[str] = None
+    ) -> Dict[str, Any]:
+        if self.skip_rendered_instance:
+            if "instruction" in instance:
+                return instance
+
+        instance["instruction"] = self.get_instruction(instance)
+
+        return instance
+
     @abstractmethod
-    def __call__(self) -> str:
+    def get_instruction(self, instance: Dict[str, object]) -> str:
         pass
 
 
 class TextualInstruction(Instruction):
     text: str
 
-    def __call__(self) -> str:
+    def get_instruction(self, instance: Dict[str, object]) -> str:
         return self.text
 
-    def __repr__(self):
-        return self.text
+
+class EmptyInstruction(Instruction):
+    def get_instruction(self, instance: Dict[str, object]) -> str:
+        return ""
 
 
 class InstructionsList(ListCollection):