118 lines
4.5 KiB
Python
118 lines
4.5 KiB
Python
from typing import Any
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class VariableRepository:
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"""
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Unified repository for system, user, and echoed prompt variables.
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System variables (underscore-prefixed names like ``_model``) are populated
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once per processing session and are read-only during prompt evaluation.
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User variables are created and mutated by set/echo constructs in the prompt.
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Echoed variables record which user variables have already been output and
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with what resolved string value.
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"""
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def __init__(self) -> None:
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self._system: dict[str, Any] = {}
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self._user: dict[str, Any] = {}
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self._echoed: dict[str, str] = {}
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def name_is_system(self, name: str) -> bool:
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"""Return True if *name* is a system variable (i.e. starts with an underscore)."""
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return name.startswith("_")
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# ---- System variables ----
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def get_system(self, name: str, default: Any = None) -> Any:
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"""Return the value of a system variable, or *default* if absent."""
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return self._system.get(name, default)
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def set_system(self, name: str, value: Any) -> None:
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"""Set a system variable."""
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if not self.name_is_system(name):
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raise ValueError(f"invalid system variable name '{name}': must start with an underscore")
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self._system[name] = value
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def update_system(self, mapping: dict[str, Any]) -> None:
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"""Bulk-update system variables from *mapping*."""
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for name in mapping:
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if not self.name_is_system(name):
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raise ValueError(f"invalid system variable name '{name}': must start with an underscore")
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self._system.update(mapping)
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def clear_system(self) -> None:
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"""Remove all system variables."""
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self._system.clear()
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def get_all_system(self) -> dict[str, Any]:
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"""Return a shallow copy of all system variables."""
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return self._system.copy()
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# ---- User variables ----
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def get_user(self, name: str, default: Any = None) -> Any:
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"""Return the value of a user variable, or *default* if absent."""
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return self._user.get(name, default)
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def set_user(self, name: str, value: Any) -> None:
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"""Set a user variable."""
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if self.name_is_system(name):
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raise ValueError(f"invalid user variable name '{name}': must not start with an underscore")
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self._user[name] = value
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def delete_user(self, name: str) -> None:
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"""Remove a user variable (no-op if it does not exist)."""
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self._user.pop(name, None)
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def clear_user(self) -> None:
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"""Remove all user variables."""
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self._user.clear()
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# ---- Echoed variables ----
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def get_echoed_value(self, name: str, default: str | None = None) -> str | None:
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"""Return the echoed string value for *name*, or *default* if not echoed."""
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return self._echoed.get(name, default)
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def echo(self, name: str, value: str) -> None:
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"""Record that *name* was echoed with *value*."""
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self._echoed[name] = value
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def clear_echoed(self) -> None:
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"""Remove all echoed-variable records."""
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self._echoed.clear()
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# ---- Combined queries ----
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def get(self, name: str, default: Any = None) -> Any:
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"""
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Return the value of a variable, checking system variables first, then user variables.
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Args:
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name (str): The name of the variable.
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default (Any): The value to return if the variable is not found.
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"""
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if name in self._system:
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return self._system.get(name, default)
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return self._user.get(name, default)
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def all_user_or_echoed_keys(self) -> set[str]:
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"""Return the union of user-variable and echoed-variable keys."""
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return set(self._user.keys()) | set(self._echoed.keys())
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# ---- State backup / restore ----
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def backup_user_and_echoed(self) -> tuple[dict[str, Any], dict[str, str]]:
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"""Return shallow-copy snapshots of user and echoed variables for rollback."""
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return self._user.copy(), self._echoed.copy()
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def restore_user_and_echoed(self, backup: tuple[dict[str, Any], dict[str, str]]) -> None:
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"""Restore user and echoed variables from a snapshot made by :meth:`backup_user_and_echoed`."""
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user_backup, echoed_backup = backup
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self._user.clear()
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self._user.update(user_backup)
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self._echoed.clear()
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self._echoed.update(echoed_backup)
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