Merge pull request #74 from haskell-servant/wip-whitespace-comment
servant: clean up some white spaces, add link explaining why Or works.
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commit
e59c03faa2
1 changed files with 24 additions and 22 deletions
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@ -138,15 +138,17 @@ data Link = Link
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-- | If either a or b produce an empty constraint, produce an empty constraint.
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type family Or (a :: Constraint) (b :: Constraint) :: Constraint where
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-- This works because of:
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-- https://ghc.haskell.org/trac/ghc/wiki/NewAxioms/CoincidentOverlap
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Or () b = ()
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Or a () = ()
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-- | If both a or b produce an empty constraint, produce an empty constraint.
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type family And (a :: Constraint) (b :: Constraint) :: Constraint where
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And () () = ()
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And () () = ()
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-- | You may use this type family to tell the type checker that your custom type
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-- may be skipped as part of a link. This is useful for things like
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-- | You may use this type family to tell the type checker that your custom
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-- type may be skipped as part of a link. This is useful for things like
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-- 'QueryParam' that are optional in a URI and do not affect them if they are
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-- omitted.
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--
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@ -162,30 +164,30 @@ type family IsElem' a s :: Constraint
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-- | Closed type family, check if endpoint is within api
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type family IsElem endpoint api :: Constraint where
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IsElem e (sa :<|> sb) = Or (IsElem e sa) (IsElem e sb)
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IsElem (e :> sa) (e :> sb) = IsElem sa sb
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IsElem sa (Header x :> sb) = IsElem sa sb
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IsElem sa (ReqBody y x :> sb) = IsElem sa sb
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IsElem (e :> sa) (Capture x y :> sb) = IsElem sa sb
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IsElem sa (QueryParam x y :> sb) = IsElem sa sb
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IsElem sa (QueryParams x y :> sb) = IsElem sa sb
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IsElem sa (QueryFlag x :> sb) = IsElem sa sb
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IsElem sa (MatrixParam x y :> sb) = IsElem sa sb
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IsElem sa (MatrixParams x y :> sb) = IsElem sa sb
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IsElem sa (MatrixFlag x :> sb) = IsElem sa sb
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IsElem (Get ct typ) (Get ct' typ) = IsSubList ct ct'
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IsElem (Post ct typ) (Post ct' typ) = IsSubList ct ct'
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IsElem (Put ct typ) (Put ct' typ) = IsSubList ct ct'
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IsElem (Delete ct typ) (Delete ct' typ) = IsSubList ct ct'
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IsElem e e = ()
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IsElem e a = IsElem' e a
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IsElem e (sa :<|> sb) = Or (IsElem e sa) (IsElem e sb)
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IsElem (e :> sa) (e :> sb) = IsElem sa sb
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IsElem sa (Header x :> sb) = IsElem sa sb
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IsElem sa (ReqBody y x :> sb) = IsElem sa sb
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IsElem (e :> sa) (Capture x y :> sb) = IsElem sa sb
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IsElem sa (QueryParam x y :> sb) = IsElem sa sb
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IsElem sa (QueryParams x y :> sb) = IsElem sa sb
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IsElem sa (QueryFlag x :> sb) = IsElem sa sb
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IsElem sa (MatrixParam x y :> sb) = IsElem sa sb
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IsElem sa (MatrixParams x y :> sb) = IsElem sa sb
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IsElem sa (MatrixFlag x :> sb) = IsElem sa sb
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IsElem (Get ct typ) (Get ct' typ) = IsSubList ct ct'
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IsElem (Post ct typ) (Post ct' typ) = IsSubList ct ct'
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IsElem (Put ct typ) (Put ct' typ) = IsSubList ct ct'
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IsElem (Delete ct typ) (Delete ct' typ) = IsSubList ct ct'
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IsElem e e = ()
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IsElem e a = IsElem' e a
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type family IsSubList a b :: Constraint where
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IsSubList '[] b = ()
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IsSubList '[] b = ()
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IsSubList '[x] (x ': xs) = ()
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IsSubList '[x] (y ': ys) = IsSubList '[x] ys
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IsSubList (x ': xs) y = IsSubList '[x] y `And` IsSubList xs y
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IsSubList (x ': xs) y = IsSubList '[x] y `And` IsSubList xs y
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-- Phantom types for Param
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data Matrix
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