-
-
-%************************************************************************
-%* *
-\subsection{Collecting binders from @HsBinds@}
-%* *
-%************************************************************************
-
-Get all the binders in some @MonoBinds@, IN THE ORDER OF APPEARANCE.
-
-These functions are here, rather than in HsBinds, to avoid a loop between HsPat and HsBinds.
-
-\begin{verbatim}
-...
-where
- (x, y) = ...
- f i j = ...
- [a, b] = ...
-\end{verbatim}
-it should return @[x, y, f, a, b]@ (remember, order important).
-
-\begin{code}
-collectLocatedHsBinders :: HsBinds name -> [(name,SrcLoc)]
--- Used at top level only; so no need for an IPBinds case
-collectLocatedHsBinders EmptyBinds = []
-collectLocatedHsBinders (MonoBind b _ _)
- = collectLocatedMonoBinders b
-collectLocatedHsBinders (ThenBinds b1 b2)
- = collectLocatedHsBinders b1 ++ collectLocatedHsBinders b2
-
-collectHsBinders :: HsBinds name -> [name]
-collectHsBinders EmptyBinds = []
-collectHsBinders (IPBinds _) = [] -- Implicit parameters don't create
- -- ordinary bindings
-collectHsBinders (MonoBind b _ _) = collectMonoBinders b
-collectHsBinders (ThenBinds b1 b2) = collectHsBinders b1 ++ collectHsBinders b2
-
-collectLocatedMonoBinders :: MonoBinds name -> [(name,SrcLoc)]
-collectLocatedMonoBinders binds
- = go binds []
- where
- go EmptyMonoBinds acc = acc
- go (PatMonoBind pat _ loc) acc = map (\v->(v,loc)) (collectPatBinders pat) ++ acc
- go (FunMonoBind f _ _ loc) acc = (f,loc) : acc
- go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
-
-collectMonoBinders :: MonoBinds name -> [name]
-collectMonoBinders binds
- = go binds []
- where
- go EmptyMonoBinds acc = acc
- go (PatMonoBind pat _ loc) acc = collectPatBinders pat ++ acc
- go (FunMonoBind f _ _ loc) acc = f : acc
- go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
- go (VarMonoBind v _) acc = v : acc
- go (AbsBinds _ _ dbinds _ binds) acc
- = [dp | (_,dp,_) <- dbinds] ++ go binds acc
-\end{code}
-
-
-%************************************************************************
-%* *
-\subsection{Getting patterns out of bindings}
-%* *
-%************************************************************************
-
-Get all the pattern type signatures out of a bunch of bindings
-
-\begin{code}
-collectSigTysFromHsBinds :: HsBinds name -> [HsType name]
-collectSigTysFromHsBinds EmptyBinds = []
-collectSigTysFromHsBinds (IPBinds _) = []
-collectSigTysFromHsBinds (MonoBind b _ _) = collectSigTysFromMonoBinds b
-collectSigTysFromHsBinds (ThenBinds b1 b2) = collectSigTysFromHsBinds b1 ++
- collectSigTysFromHsBinds b2
-
-
-collectSigTysFromMonoBinds :: MonoBinds name -> [HsType name]
-collectSigTysFromMonoBinds bind
- = go bind []
- where
- go EmptyMonoBinds acc = acc
- go (PatMonoBind pat _ loc) acc = collectSigTysFromPat pat ++ acc
- go (FunMonoBind f _ ms loc) acc = go_matches ms acc
- go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
-
- -- A binding like x :: a = f y
- -- is parsed as FunMonoBind, but for this purpose we
- -- want to treat it as a pattern binding
- go_matches [] acc = acc
- go_matches (Match [] (Just sig) _ : matches) acc = sig : go_matches matches acc
- go_matches (match : matches) acc = go_matches matches acc
-\end{code}
-
-\begin{code}
-collectStmtsBinders :: [Stmt id] -> [id]
-collectStmtsBinders = concatMap collectStmtBinders
-
-collectStmtBinders :: Stmt id -> [id]
- -- Id Binders for a Stmt... [but what about pattern-sig type vars]?
-collectStmtBinders (BindStmt pat _ _) = collectPatBinders pat
-collectStmtBinders (LetStmt binds) = collectHsBinders binds
-collectStmtBinders (ExprStmt _ _ _) = []
-collectStmtBinders (ResultStmt _ _) = []
-collectStmtBinders (RecStmt ss _ _ _) = collectStmtsBinders ss
-collectStmtBinders other = panic "collectStmtBinders"
-\end{code}
-