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58 lines
2.1 KiB
Python
58 lines
2.1 KiB
Python
"""String-keyed registry for chunking strategies.
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Mirrors ``RetrieverCreator``: features register new strategies (``recursive``,
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``markdown``, ``parent_child``, ...) without touching the dispatch site. The
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classic strategy is registered under ``classic_chunk`` by ``chunking.py``.
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"""
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from __future__ import annotations
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from typing import Type
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class ChunkerCreator:
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chunkers: dict[str, Type] = {}
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_strategies_loaded: bool = False
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@classmethod
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def _ensure_builtin(cls) -> None:
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"""Register built-in chunkers if they are not registered yet.
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Self-bootstraps so ``create_chunker`` works regardless of import order:
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``application.parser.chunking`` registers ``classic_chunk`` and
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``application.parser.chunking_strategies`` registers ``recursive`` /
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``markdown`` / ``parent_child``.
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"""
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if not cls.chunkers:
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import application.parser.chunking # noqa: F401 (registers classic_chunk)
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if not cls._strategies_loaded:
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cls._strategies_loaded = True
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import application.parser.chunking_strategies # noqa: F401
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@classmethod
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def create_chunker(cls, strategy: str, *args, **kwargs):
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"""Instantiate the chunker registered under ``strategy``.
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Args:
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strategy: Registry key (e.g. ``classic_chunk``).
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*args: Positional args forwarded to the chunker constructor.
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**kwargs: Keyword args forwarded to the chunker constructor.
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Returns:
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A chunker instance exposing ``chunk(documents) -> List[Document]``.
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Raises:
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ValueError: If no chunker is registered for ``strategy``.
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"""
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cls._ensure_builtin()
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key = (strategy or "classic_chunk").lower()
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chunker_class = cls.chunkers.get(key)
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if not chunker_class:
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raise ValueError(f"No chunker class found for strategy {strategy}")
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return chunker_class(*args, **kwargs)
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@classmethod
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def register(cls, key: str, chunker_class: Type) -> None:
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"""Register ``chunker_class`` under ``key`` (idempotent)."""
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cls.chunkers[key] = chunker_class
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