24 lines
828 B
Python
24 lines
828 B
Python
"""The rung vocabulary, sourced from the bible's disposition-ladder entry. The
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bible owns rung names/order; band NUMBERS live in client code and never here."""
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from .errors import BuildError
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from .model import Entry
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LADDER_ID = "rule.disposition-ladder"
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NEVER = "never"
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def ladder_rungs(entries: list[Entry]) -> list[str]:
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ladders = [e for e in entries if e.id == LADDER_ID]
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if len(ladders) != 1:
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raise BuildError(
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f"exactly one '{LADDER_ID}' entry required, found {len(ladders)}")
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if not ladders[0].rungs:
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raise BuildError("disposition-ladder needs a non-empty 'rungs:' list",
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source=ladders[0].source, entry_id=LADDER_ID)
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return list(ladders[0].rungs)
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def legal_gates(entries: list[Entry]) -> set[str]:
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return set(ladder_rungs(entries)) | {NEVER}
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