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Resolve a measured sloping-ceiling depth to its ladder member 🟩

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-07-23 13:48:50 +00:00
parent a717ff7a99
commit 02a71feae1
1 changed files with 48 additions and 2 deletions
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50
domain/epc/property_overrides/roof_sloping_ceiling_guard.py
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@ -11,19 +11,65 @@ from domain.epc.property_overrides.roof_type import RoofType
# family, never the loft ladder (ADR-0066).
_SLOPING_CEILING_TOKEN = "pitchedwithslopingceiling"
# The measured-depth ladder (Table 17 col (1a) tabulated thicknesses), ascending.
# A lodged depth snaps to the nearest tabulated depth ≤ N — mirroring the
# calculator's `_ROOF_BY_THICKNESS` picker — so an off-ladder value never leaks
# back to the loft LLM route. `400+` / any depth > 400 is the top member.
_DEPTH_LADDER: list[tuple[int, RoofType]] = [
(12, RoofType.PITCHED_SLOPING_CEILING_12MM),
(25, RoofType.PITCHED_SLOPING_CEILING_25MM),
(50, RoofType.PITCHED_SLOPING_CEILING_50MM),
(75, RoofType.PITCHED_SLOPING_CEILING_75MM),
(100, RoofType.PITCHED_SLOPING_CEILING_100MM),
(125, RoofType.PITCHED_SLOPING_CEILING_125MM),
(150, RoofType.PITCHED_SLOPING_CEILING_150MM),
(175, RoofType.PITCHED_SLOPING_CEILING_175MM),
(200, RoofType.PITCHED_SLOPING_CEILING_200MM),
(225, RoofType.PITCHED_SLOPING_CEILING_225MM),
(250, RoofType.PITCHED_SLOPING_CEILING_250MM),
(270, RoofType.PITCHED_SLOPING_CEILING_270MM),
(300, RoofType.PITCHED_SLOPING_CEILING_300MM),
(350, RoofType.PITCHED_SLOPING_CEILING_350MM),
(400, RoofType.PITCHED_SLOPING_CEILING_400MM),
]
_TOP_TABULATED_MM = 400
def _normalise_roof_token(description: str) -> str:
token = description.split(":", 1)[0]
return re.sub(r"[^a-z0-9]", "", token.lower())
def _member_for_depth(insulation: str) -> Optional[RoofType]:
"""The ladder member for a lodged insulation suffix, or None when it carries
no measured depth (`As Built` / `Unknown` / empty) so the caller folds it to
`as built`. An explicit `+` or any depth above 400 mm → the 400+ member; an
off-ladder depth snaps to the nearest tabulated depth ≤ N; a depth below the
ladder (< 12 mm) has no member and also folds to `as built`."""
digits = re.search(r"\d+", insulation)
if digits is None:
return None
depth_mm = int(digits.group())
if "+" in insulation or depth_mm > _TOP_TABULATED_MM:
return RoofType.PITCHED_SLOPING_CEILING_400_PLUS
member: Optional[RoofType] = None
for tabulated_mm, ladder_member in _DEPTH_LADDER:
if depth_mm >= tabulated_mm:
member = ladder_member
return member
def roof_sloping_ceiling_guard(description: str) -> Optional[RoofType]:
"""Deterministically resolve a `PitchedWithSlopingCeiling` roof description to
its `Pitched, sloping ceiling, …` RoofType member (ADR-0066).
Returns None for anything that is not a sloping-ceiling marker, so the
A measured depth resolves to its ladder member (nearest tabulated depth ≤ N;
`400+` / above-400 → the 400+ member); `As Built` / `Unknown` / a sub-ladder
depth / no suffix fold to `as built`, which defers the U-value to the age
band. Returns None for anything that is not a sloping-ceiling marker, so the
party-ceiling guard and the LLM classifier still handle the rest.
"""
if _normalise_roof_token(description) != _SLOPING_CEILING_TOKEN:
return None
return RoofType.PITCHED_SLOPING_CEILING_AS_BUILT
_, _, insulation = description.partition(":")
return _member_for_depth(insulation) or RoofType.PITCHED_SLOPING_CEILING_AS_BUILT