| Safe Haskell | None |
|---|---|
| Language | Haskell98 |
VarEnv
Contents
- type VarEnv elt = UniqFM elt
- type IdEnv elt = VarEnv elt
- type TyVarEnv elt = VarEnv elt
- type CoVarEnv elt = VarEnv elt
- emptyVarEnv :: VarEnv a
- unitVarEnv :: Var -> a -> VarEnv a
- mkVarEnv :: [(Var, a)] -> VarEnv a
- elemVarEnv :: Var -> VarEnv a -> Bool
- varEnvElts :: VarEnv a -> [a]
- varEnvKeys :: VarEnv a -> [Unique]
- extendVarEnv :: VarEnv a -> Var -> a -> VarEnv a
- extendVarEnv_C :: (a -> a -> a) -> VarEnv a -> Var -> a -> VarEnv a
- extendVarEnv_Acc :: (a -> b -> b) -> (a -> b) -> VarEnv b -> Var -> a -> VarEnv b
- extendVarEnvList :: VarEnv a -> [(Var, a)] -> VarEnv a
- plusVarEnv :: VarEnv a -> VarEnv a -> VarEnv a
- plusVarEnv_C :: (a -> a -> a) -> VarEnv a -> VarEnv a -> VarEnv a
- plusVarEnv_CD :: (a -> a -> a) -> VarEnv a -> a -> VarEnv a -> a -> VarEnv a
- alterVarEnv :: (Maybe a -> Maybe a) -> VarEnv a -> Var -> VarEnv a
- delVarEnvList :: VarEnv a -> [Var] -> VarEnv a
- delVarEnv :: VarEnv a -> Var -> VarEnv a
- minusVarEnv :: VarEnv a -> VarEnv b -> VarEnv a
- intersectsVarEnv :: VarEnv a -> VarEnv a -> Bool
- lookupVarEnv :: VarEnv a -> Var -> Maybe a
- lookupVarEnv_NF :: VarEnv a -> Var -> a
- lookupWithDefaultVarEnv :: VarEnv a -> a -> Var -> a
- mapVarEnv :: (a -> b) -> VarEnv a -> VarEnv b
- zipVarEnv :: [Var] -> [a] -> VarEnv a
- modifyVarEnv :: (a -> a) -> VarEnv a -> Var -> VarEnv a
- modifyVarEnv_Directly :: (a -> a) -> UniqFM a -> Unique -> UniqFM a
- isEmptyVarEnv :: VarEnv a -> Bool
- foldVarEnv :: (a -> b -> b) -> b -> VarEnv a -> b
- elemVarEnvByKey :: Unique -> VarEnv a -> Bool
- lookupVarEnv_Directly :: VarEnv a -> Unique -> Maybe a
- filterVarEnv :: (a -> Bool) -> VarEnv a -> VarEnv a
- filterVarEnv_Directly :: (Unique -> a -> Bool) -> VarEnv a -> VarEnv a
- restrictVarEnv :: VarEnv a -> VarSet -> VarEnv a
- partitionVarEnv :: (a -> Bool) -> VarEnv a -> (VarEnv a, VarEnv a)
- data InScopeSet
- emptyInScopeSet :: InScopeSet
- mkInScopeSet :: VarEnv Var -> InScopeSet
- delInScopeSet :: InScopeSet -> Var -> InScopeSet
- extendInScopeSet :: InScopeSet -> Var -> InScopeSet
- extendInScopeSetList :: InScopeSet -> [Var] -> InScopeSet
- extendInScopeSetSet :: InScopeSet -> VarEnv Var -> InScopeSet
- getInScopeVars :: InScopeSet -> VarEnv Var
- lookupInScope :: InScopeSet -> Var -> Maybe Var
- lookupInScope_Directly :: InScopeSet -> Unique -> Maybe Var
- unionInScope :: InScopeSet -> InScopeSet -> InScopeSet
- elemInScopeSet :: Var -> InScopeSet -> Bool
- uniqAway :: InScopeSet -> Var -> Var
- data RnEnv2
- mkRnEnv2 :: InScopeSet -> RnEnv2
- rnBndr2 :: RnEnv2 -> Var -> Var -> RnEnv2
- rnBndrs2 :: RnEnv2 -> [Var] -> [Var] -> RnEnv2
- rnOccL :: RnEnv2 -> Var -> Var
- rnOccR :: RnEnv2 -> Var -> Var
- inRnEnvL :: RnEnv2 -> Var -> Bool
- inRnEnvR :: RnEnv2 -> Var -> Bool
- rnOccL_maybe :: RnEnv2 -> Var -> Maybe Var
- rnOccR_maybe :: RnEnv2 -> Var -> Maybe Var
- rnBndrL :: RnEnv2 -> Var -> (RnEnv2, Var)
- rnBndrR :: RnEnv2 -> Var -> (RnEnv2, Var)
- nukeRnEnvL :: RnEnv2 -> RnEnv2
- nukeRnEnvR :: RnEnv2 -> RnEnv2
- delBndrL :: RnEnv2 -> Var -> RnEnv2
- delBndrR :: RnEnv2 -> Var -> RnEnv2
- delBndrsL :: RnEnv2 -> [Var] -> RnEnv2
- delBndrsR :: RnEnv2 -> [Var] -> RnEnv2
- addRnInScopeSet :: RnEnv2 -> VarEnv Var -> RnEnv2
- rnEtaL :: RnEnv2 -> Var -> (RnEnv2, Var)
- rnEtaR :: RnEnv2 -> Var -> (RnEnv2, Var)
- rnInScope :: Var -> RnEnv2 -> Bool
- rnInScopeSet :: RnEnv2 -> InScopeSet
- lookupRnInScope :: RnEnv2 -> Var -> Var
- type TidyEnv = (TidyOccEnv, VarEnv Var)
- emptyTidyEnv :: TidyEnv
Var, Id and TyVar environments (maps)
Manipulating these environments
emptyVarEnv :: VarEnv aSource
unitVarEnv :: Var -> a -> VarEnv aSource
elemVarEnv :: Var -> VarEnv a -> BoolSource
varEnvElts :: VarEnv a -> [a]Source
varEnvKeys :: VarEnv a -> [Unique]Source
extendVarEnv :: VarEnv a -> Var -> a -> VarEnv aSource
extendVarEnv_C :: (a -> a -> a) -> VarEnv a -> Var -> a -> VarEnv aSource
extendVarEnv_Acc :: (a -> b -> b) -> (a -> b) -> VarEnv b -> Var -> a -> VarEnv bSource
extendVarEnvList :: VarEnv a -> [(Var, a)] -> VarEnv aSource
plusVarEnv :: VarEnv a -> VarEnv a -> VarEnv aSource
plusVarEnv_C :: (a -> a -> a) -> VarEnv a -> VarEnv a -> VarEnv aSource
plusVarEnv_CD :: (a -> a -> a) -> VarEnv a -> a -> VarEnv a -> a -> VarEnv aSource
delVarEnvList :: VarEnv a -> [Var] -> VarEnv aSource
minusVarEnv :: VarEnv a -> VarEnv b -> VarEnv aSource
intersectsVarEnv :: VarEnv a -> VarEnv a -> BoolSource
lookupVarEnv :: VarEnv a -> Var -> Maybe aSource
lookupVarEnv_NF :: VarEnv a -> Var -> aSource
lookupWithDefaultVarEnv :: VarEnv a -> a -> Var -> aSource
modifyVarEnv :: (a -> a) -> VarEnv a -> Var -> VarEnv aSource
modifyVarEnv_Directly :: (a -> a) -> UniqFM a -> Unique -> UniqFM aSource
isEmptyVarEnv :: VarEnv a -> BoolSource
foldVarEnv :: (a -> b -> b) -> b -> VarEnv a -> bSource
elemVarEnvByKey :: Unique -> VarEnv a -> BoolSource
lookupVarEnv_Directly :: VarEnv a -> Unique -> Maybe aSource
filterVarEnv :: (a -> Bool) -> VarEnv a -> VarEnv aSource
restrictVarEnv :: VarEnv a -> VarSet -> VarEnv aSource
The InScopeSet type
Operations on InScopeSets
delInScopeSet :: InScopeSet -> Var -> InScopeSetSource
extendInScopeSet :: InScopeSet -> Var -> InScopeSetSource
extendInScopeSetList :: InScopeSet -> [Var] -> InScopeSetSource
lookupInScope :: InScopeSet -> Var -> Maybe VarSource
Look up a variable the InScopeSet. This lets you map from
the variable's identity (unique) to its full value.
lookupInScope_Directly :: InScopeSet -> Unique -> Maybe VarSource
unionInScope :: InScopeSet -> InScopeSet -> InScopeSetSource
elemInScopeSet :: Var -> InScopeSet -> BoolSource
uniqAway :: InScopeSet -> Var -> VarSource
uniqAway in_scope v finds a unique that is not used in the
in-scope set, and gives that to v.
The RnEnv2 type
When we are comparing (or matching) types or terms, we are faced with "going under" corresponding binders. E.g. when comparing:
\x. e1 ~ \y. e2
Basically we want to rename [x -> y] or [y -> x], but there are lots of
things we must be careful of. In particular, x might be free in e2, or
y in e1. So the idea is that we come up with a fresh binder that is free
in neither, and rename x and y respectively. That means we must maintain:
- A renaming for the left-hand expression
- A renaming for the right-hand expressions
- An in-scope set
Furthermore, when matching, we want to be able to have an 'occurs check', to prevent:
\x. f ~ \y. y
matching with [f -> y]. So for each expression we want to know that set of
locally-bound variables. That is precisely the domain of the mappings 1.
and 2., but we must ensure that we always extend the mappings as we go in.
All of this information is bundled up in the RnEnv2
Operations on RnEnv2s
mkRnEnv2 :: InScopeSet -> RnEnv2Source
rnBndr2 :: RnEnv2 -> Var -> Var -> RnEnv2Source
rnBndr2 env bL bR goes under a binder bL in the Left term,
and binder bR in the Right term.
It finds a new binder, new_b,
and returns an environment mapping bL -> new_b and bR -> new_b
rnBndrs2 :: RnEnv2 -> [Var] -> [Var] -> RnEnv2Source
Applies rnBndr2 to several variables: the two variable lists must be of equal length
rnOccL_maybe :: RnEnv2 -> Var -> Maybe VarSource
Look up the renaming of an occurrence in the left or right term
rnOccR_maybe :: RnEnv2 -> Var -> Maybe VarSource
Look up the renaming of an occurrence in the left or right term
rnBndrL :: RnEnv2 -> Var -> (RnEnv2, Var)Source
Similar to rnBndr2 but used when there's a binder on the left
side only.
rnBndrR :: RnEnv2 -> Var -> (RnEnv2, Var)Source
Similar to rnBndr2 but used when there's a binder on the right
side only.
nukeRnEnvL :: RnEnv2 -> RnEnv2Source
Wipe the left or right side renaming
nukeRnEnvR :: RnEnv2 -> RnEnv2Source
Wipe the left or right side renaming
rnEtaL :: RnEnv2 -> Var -> (RnEnv2, Var)Source
Similar to rnBndrL but used for eta expansion
See Note [Eta expansion]
rnEtaR :: RnEnv2 -> Var -> (RnEnv2, Var)Source
Similar to rnBndr2 but used for eta expansion
See Note [Eta expansion]
lookupRnInScope :: RnEnv2 -> Var -> VarSource
TidyEnv and its operation
type TidyEnv = (TidyOccEnv, VarEnv Var)Source
When tidying up print names, we keep a mapping of in-scope occ-names
(the TidyOccEnv) and a Var-to-Var of the current renamings