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system_prompts.py

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+from abc import abstractmethod
+from typing import Any, Dict, Optional
+
+from .dataclass import NonPositionalField
+from .operator import StreamInstanceOperator
+
+
+class SystemPrompt(StreamInstanceOperator):
+    """The role of SystemPrompt is to add task-independent opening-text to every instance."""
+
+    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 "system_prompt" in instance:
+                return instance
+
+        instance["system_prompt"] = self.get_system_prompt(instance)
+
+        return instance
+
+    @abstractmethod
+    def get_system_prompt(self, instance: Dict[str, object]) -> str:
+        pass
+
+
+class TextualSystemPrompt(SystemPrompt):
+    """Specifies the system prompt as a totally independent string."""
+
+    text: str
+
+    def get_system_prompt(self, instance: Dict[str, object]) -> str:
+        return self.text
+
+
+class EmptySystemPrompt(SystemPrompt):
+    def get_system_prompt(self, instance: Dict[str, object]) -> str:
+        return ""