module Language.Fortran.Vars.Equivalence
  ( processEquivalence
  )
where

import           Data.Data                      ( Data )
import           Data.List                      ( foldl' )
import           Language.Fortran.Analysis      ( Analysis )
import           Language.Fortran.AST           ( AList
                                                , aStrip
                                                , Expression
                                                , Statement(..)
                                                )

import           Language.Fortran.Vars.MemoryLocation
                                                ( getLocation )
import           Language.Fortran.Vars.Types
                                                ( Location
                                                , ProgramUnitModel
                                                )
import           Language.Fortran.Vars.Union
                                                ( union )

associate :: ProgramUnitModel -> [Location] -> ProgramUnitModel
associate :: ProgramUnitModel -> [Location] -> ProgramUnitModel
associate ProgramUnitModel
puModel [Location]
locations =
  let Location
firstLoc : [Location]
restLocs = [Location]
locations
      f :: (ProgramUnitModel, Location)
-> Location -> (ProgramUnitModel, Location)
f (ProgramUnitModel
model, Location
loc) = ProgramUnitModel
-> Location -> Location -> (ProgramUnitModel, Location)
union ProgramUnitModel
model Location
loc
      (ProgramUnitModel
puModel', Location
_) = ((ProgramUnitModel, Location)
 -> Location -> (ProgramUnitModel, Location))
-> (ProgramUnitModel, Location)
-> [Location]
-> (ProgramUnitModel, Location)
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' (ProgramUnitModel, Location)
-> Location -> (ProgramUnitModel, Location)
f (ProgramUnitModel
puModel, Location
firstLoc) [Location]
restLocs
  in  ProgramUnitModel
puModel'

equivalence
  :: Data a => ProgramUnitModel -> Statement (Analysis a) -> ProgramUnitModel
equivalence :: ProgramUnitModel -> Statement (Analysis a) -> ProgramUnitModel
equivalence ProgramUnitModel
puModel0 (StEquivalence Analysis a
_ SrcSpan
_ AList (AList Expression) (Analysis a)
equivsList) = (ProgramUnitModel
 -> AList Expression (Analysis a) -> ProgramUnitModel)
-> ProgramUnitModel
-> [AList Expression (Analysis a)]
-> ProgramUnitModel
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl'
  ProgramUnitModel
-> AList Expression (Analysis a) -> ProgramUnitModel
forall a.
Data a =>
ProgramUnitModel
-> AList Expression (Analysis a) -> ProgramUnitModel
f
  ProgramUnitModel
puModel0
  (AList (AList Expression) (Analysis a)
-> [AList Expression (Analysis a)]
forall (t :: * -> *) a. AList t a -> [t a]
aStrip AList (AList Expression) (Analysis a)
equivsList)
 where
  f
    :: Data a
    => ProgramUnitModel
    -> AList Expression (Analysis a)
    -> ProgramUnitModel
  f :: ProgramUnitModel
-> AList Expression (Analysis a) -> ProgramUnitModel
f model :: ProgramUnitModel
model@(SymbolTable
symTable, StorageTable
_) AList Expression (Analysis a)
equivs =
    let locations :: [Location]
locations = (Expression (Analysis a) -> Location)
-> [Expression (Analysis a)] -> [Location]
forall a b. (a -> b) -> [a] -> [b]
map (SymbolTable -> Expression (Analysis a) -> Location
forall a.
Data a =>
SymbolTable -> Expression (Analysis a) -> Location
getLocation SymbolTable
symTable) (AList Expression (Analysis a) -> [Expression (Analysis a)]
forall (t :: * -> *) a. AList t a -> [t a]
aStrip AList Expression (Analysis a)
equivs)
    in  ProgramUnitModel -> [Location] -> ProgramUnitModel
associate ProgramUnitModel
model [Location]
locations
equivalence ProgramUnitModel
model Statement (Analysis a)
_ = ProgramUnitModel
model

-- | Given a list of all the 'Statement's in the program and a 'ProgramUnitModel', produce a new
-- 'ProgramUnitModel' that accounts for any of the FORTRAN equivalences that were found in the
-- 'Language.Fortran.AST.ProgramUnit'
processEquivalence
  :: Data a => [Statement (Analysis a)] -> ProgramUnitModel -> ProgramUnitModel
processEquivalence :: [Statement (Analysis a)] -> ProgramUnitModel -> ProgramUnitModel
processEquivalence [Statement (Analysis a)]
stmts ProgramUnitModel
puModel = (ProgramUnitModel -> Statement (Analysis a) -> ProgramUnitModel)
-> ProgramUnitModel -> [Statement (Analysis a)] -> ProgramUnitModel
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' ProgramUnitModel -> Statement (Analysis a) -> ProgramUnitModel
forall a.
Data a =>
ProgramUnitModel -> Statement (Analysis a) -> ProgramUnitModel
equivalence ProgramUnitModel
puModel [Statement (Analysis a)]
eqvStmts
  where eqvStmts :: [Statement (Analysis a)]
eqvStmts = [ Statement (Analysis a)
s | s :: Statement (Analysis a)
s@StEquivalence{} <- [Statement (Analysis a)]
stmts ]