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proof(SafeColor): DISCHARGE WCAG-AA + WCAG-AAA threshold anchors via Refl (proven#90) #105

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Merged
hyperpolymath merged 1 commit into from
May 30, 2026
Merged

proof(SafeColor): DISCHARGE WCAG-AA + WCAG-AAA threshold anchors via Refl (proven#90) #105

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16 changes: 12 additions & 4 deletions src/Proven/SafeColor/Proofs.idr
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Original file line number Diff line number Diff line change
Expand Up @@ -85,12 +85,20 @@ parseHexEmptyRejected = Refl
-- OWED markers
--------------------------------------------------------------------------------

||| OWED: WCAG-AA threshold = 4.5. Blocked on Double-comparison opacity.
||| DISCHARGED: WCAG-AA threshold = 4.5. `meetsWCAG_AA` is `public
||| export` with body `contrastRatio c1 c2 >= 4.5` (SafeColor.idr
||| L188-189), so the LHS unfolds directly to the RHS for `Refl`. No
||| Double-comparison reduction is needed — both sides are literally
||| the same expression.
public export
0 wcagAAThreshold :
wcagAAThreshold :
(c1, c2 : RGB) -> meetsWCAG_AA c1 c2 = (contrastRatio c1 c2 >= 4.5)
wcagAAThreshold _ _ = Refl

||| OWED: WCAG-AAA threshold = 7.0. Same blocker.
||| DISCHARGED: WCAG-AAA threshold = 7.0. `meetsWCAG_AAA` is `public
||| export` with body `contrastRatio c1 c2 >= 7.0` (SafeColor.idr
||| L193-194) — same unfolding pattern as `wcagAAThreshold`.
public export
0 wcagAAAThreshold :
wcagAAAThreshold :
(c1, c2 : RGB) -> meetsWCAG_AAA c1 c2 = (contrastRatio c1 c2 >= 7.0)
wcagAAAThreshold _ _ = Refl
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