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74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
"""Flash-cards block – LLM-generated study cards.
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Returns ``cards: [{front, back, hint}]`` ready for the frontend
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``FlashCardsBlock`` component.
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Prompts live in ``deeptutor/book/prompts/{en,zh}/flash_cards.yaml``.
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"""
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from __future__ import annotations
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from typing import Any
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from ..models import BlockType, SourceAnchor
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from ._llm_writer import llm_json
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from ._prompts import get_book_prompt, load_book_prompts
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from .base import BlockContext, BlockGenerator, GenerationFailure
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class FlashCardsGenerator(BlockGenerator):
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block_type = BlockType.FLASH_CARDS
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async def _generate(
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self, ctx: BlockContext
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) -> tuple[dict[str, Any], list[SourceAnchor], dict[str, Any]]:
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params = ctx.block.params
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chapter_title = params.get("chapter_title", ctx.chapter.title)
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chapter_summary = params.get("chapter_summary", ctx.chapter.summary)
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objectives = params.get("objectives") or ctx.chapter.learning_objectives
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count = max(3, min(8, int(params.get("count") or 5)))
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prompts = load_book_prompts("flash_cards", ctx.language)
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none_label = "(无)" if ctx.language == "zh" else "(none)"
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system_prompt = get_book_prompt(prompts, "system_template").format(count=count)
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user_prompt = get_book_prompt(prompts, "user_template").format(
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chapter_title=chapter_title,
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chapter_summary=chapter_summary or none_label,
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objectives_inline="; ".join(objectives) or none_label,
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)
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data = await llm_json(
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user_prompt=user_prompt,
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system_prompt=system_prompt,
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max_tokens=900,
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temperature=0.4,
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language=ctx.language,
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expected_key="cards",
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)
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cards_raw = data.get("cards") if isinstance(data, dict) else None
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cards: list[dict[str, str]] = []
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if isinstance(cards_raw, list):
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for item in cards_raw[:count]:
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if not isinstance(item, dict):
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continue
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front = str(item.get("front") or "").strip()
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back = str(item.get("back") or "").strip()
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if not front or not back:
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continue
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cards.append(
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{
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"front": front[:300],
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"back": back[:600],
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"hint": str(item.get("hint") or "").strip()[:200],
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}
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)
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if not cards:
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raise GenerationFailure("LLM did not return any flashcards.")
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return (
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{"cards": cards},
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[],
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data.get("_metadata") if isinstance(data.get("_metadata"), dict) else {},
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)
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__all__ = ["FlashCardsGenerator"]
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