diagrams

app/Main.hs

@@ -74,6 +74,11 @@ options = RLPCOptions
         <> metavar "rlp|core"
         <> help "the language to be compiled -- see README"
         )
+    <*> flag False True
+        (  long "render"
+        <> short 'r'
+        <> help "render a diagram of each GM state"
+        )
     <*> some (argument str $ metavar "FILES...")
     where
         infixr 9 #

rlp.cabal

@@ -22,6 +22,9 @@ library
     exposed-modules:  Core
                     , TI
                     , GM
+                    , GM.Visual
+                    , GM.Types
+                    , GM.Print
                     , Compiler.RLPC
                     , Compiler.RlpcError
                     , Compiler.JustRun
@@ -32,8 +35,6 @@ library
                     , Core.HindleyMilner
                     , Control.Monad.Errorful
                     , Rlp.Syntax
-                    , Rlp.Syntax.Backstage
-                    , Rlp.Syntax.Types
                     -- , Rlp.Parse.Decls
                     , Rlp.Parse
                     , Rlp.Parse.Associate
@@ -75,7 +76,9 @@ library
                     , effectful-core ^>=2.3.0.0
                     , deriving-compat ^>=0.6.0
                     , these >=0.2 && <2.0
-                    , free >=5.2
+                    , diagrams
+                    , diagrams-lib
+                    , diagrams-cairo
 
     hs-source-dirs:   src
     default-language: GHC2021
@@ -119,10 +122,8 @@ test-suite rlp-test
                  , QuickCheck
                  , hspec            ==2.*
                  , microlens
-                 , lens >=5.2.3 && <6.0
     other-modules: Arith
                  , GMSpec
                  , Core.HindleyMilnerSpec
-                 , Compiler.TypesSpec
     build-tool-depends: hspec-discover:hspec-discover
 

src/Compiler/RLPC.hs

@@ -120,6 +120,7 @@ data RLPCOptions = RLPCOptions
     , _rlpcEvaluator   :: Evaluator
     , _rlpcHeapTrigger :: Int
     , _rlpcLanguage    :: Maybe Language
+    , _rlpcRender      :: Bool
     , _rlpcInputFiles  :: [FilePath]
     }
     deriving Show
@@ -141,6 +142,7 @@ instance Default RLPCOptions where
         , _rlpcHeapTrigger = 200
         , _rlpcInputFiles = []
         , _rlpcLanguage = Nothing
+        , _rlpcRender = False
         }
 
 -- debug flags are passed with -dFLAG
@@ -220,9 +222,9 @@ docRlpcErr msg = header
                 rule = repeat (ttext . Ansi.blue . Ansi.bold $ "|")
                 srclines = ["", "<problematic source code>", ""]
         filename = msgColour "<input>"
-        pos = msgColour $ tshow (msg ^. msgSpan . srcSpanLine)
+        pos = msgColour $ tshow (msg ^. msgSpan . srcspanLine)
                        <> ":"
-                       <> tshow (msg ^. msgSpan . srcSpanColumn)
+                       <> tshow (msg ^. msgSpan . srcspanColumn)
 
         header = ttext $ filename <> msgColour ":" <> pos <> msgColour ": "
                         <> errorColour "error" <> msgColour ":"

src/Compiler/Types.hs

@@ -1,81 +1,33 @@
 {-# LANGUAGE TemplateHaskell #-}
-{-# LANGUAGE FunctionalDependencies #-}
-{-# LANGUAGE UndecidableInstances, QuantifiedConstraints #-}
-{-# LANGUAGE PatternSynonyms #-}
 module Compiler.Types
     ( SrcSpan(..)
-    , srcSpanLine, srcSpanColumn, srcSpanAbs, srcSpanLen
+    , srcspanLine, srcspanColumn, srcspanAbs, srcspanLen
-    , pattern (:<$)
     , Located(..)
-    , HasLocation(..)
     , _Located
-    , nolo, nolo'
+    , located
-
+    , nolo
-    , (<~>), (~>), (~~>), (<~~)
+    , (<<~), (<~>), (<#>)
-
-    , comb2, comb3, comb4
-    , lochead
 
     -- * Re-exports
-    , Comonad(extract)
+    , Comonad
     , Apply
     , Bind
     )
     where
 --------------------------------------------------------------------------------
-import Language.Haskell.TH.Syntax   (Lift)
-
 import Control.Comonad
-import Control.Comonad.Cofree
-import Control.Comonad.Trans.Cofree qualified as Trans.Cofree
-import Control.Comonad.Trans.Cofree (CofreeF)
 import Data.Functor.Apply
 import Data.Functor.Bind
-import Data.Functor.Compose
+import Control.Lens             hiding ((<<~))
-import Data.Functor.Foldable
+import Language.Haskell.TH.Syntax   (Lift)
-import Data.Semigroup.Foldable
-import Data.Fix                     hiding (cata, ana)
-import Data.Kind
-import Control.Lens                 hiding ((<<~), (:<))
-
-import Data.List.NonEmpty           (NonEmpty)
-import Data.Function                (on)
 --------------------------------------------------------------------------------
 
 -- | Token wrapped with a span (line, column, absolute, length)
 data Located a = Located SrcSpan a
     deriving (Show, Lift, Functor)
 
-data Floc f = Floc SrcSpan (f (Floc f))
+located :: Lens (Located a) (Located b) a b
-
+located = lens extract ($>)
-pattern (:<$) :: a -> f b -> Trans.Cofree.CofreeF f a b
-pattern a :<$ b = a Trans.Cofree.:< b
-
-(<~>) :: a -> b -> SrcSpan
-(<~>) = undefined
-
-infixl 5 <~>
-
--- (~>) :: (CanGet k, CanSet k', HasLocation k a, HasLocation k' b)
---      => a -> b -> b
--- a ~> b = 
-(~>) = undefined
-
-infixl 4 ~>
-
--- (~~>) :: (CanGet k, HasLocation k a, CanSet k', HasLocation k' b)
---       => (a -> b) -> a -> b
--- (~~>) :: (f SrcSpan -> b) -> Cofree f SrcSpan -> Cofree f SrcSpan
--- f ~~> (ss :< as) = ss :< f as
-(~~>) = undefined
-
-infixl 3 ~~>
-
--- (<~~) :: (GetLocation a, HasLocation b) => (a -> b) -> a -> b
--- a <~~ b = a b & location <>~ srcspan b
-(<~~) = undefined
-
-infixr 2 <~~
 
 instance Apply Located where
     liftF2 f (Located sa p) (Located sb q)
@@ -95,136 +47,53 @@ data SrcSpan = SrcSpan
     !Int -- ^ Column
     !Int -- ^ Absolute
     !Int -- ^ Length
-    deriving (Show, Eq, Lift)
+    deriving (Show, Lift)
 
 tupling :: Iso' SrcSpan (Int, Int, Int, Int)
 tupling = iso (\ (SrcSpan a b c d) -> (a,b,c,d))
               (\ (a,b,c,d) -> SrcSpan a b c d)
 
-srcSpanLine, srcSpanColumn, srcSpanAbs, srcSpanLen :: Lens' SrcSpan Int
+srcspanLine, srcspanColumn, srcspanAbs, srcspanLen :: Lens' SrcSpan Int
-srcSpanLine = tupling . _1
+srcspanLine = tupling . _1
-srcSpanColumn = tupling . _2
+srcspanColumn = tupling . _2
-srcSpanAbs = tupling . _3
+srcspanAbs = tupling . _3
-srcSpanLen = tupling . _4
+srcspanLen = tupling . _4
 
 -- | debug tool
 nolo :: a -> Located a
 nolo = Located (SrcSpan 0 0 0 0)
 
-nolo' :: f (Cofree f SrcSpan) -> Cofree f SrcSpan
-nolo' as = SrcSpan 0 0 0 0 :< as
-
 instance Semigroup SrcSpan where
-    -- multiple identities? what are the consequences of this...?
-    SrcSpan _ _ _ 0 <> SrcSpan l c a s = SrcSpan l c a s
-    SrcSpan l c a s <> SrcSpan _ _ _ 0 = SrcSpan l c a s
-
     SrcSpan la ca aa sa <> SrcSpan lb cb ab sb = SrcSpan l c a s where
         l = min la lb
         c = min ca cb
         a = min aa ab
         s = case aa `compare` ab of
             EQ -> max sa sb
-            LT -> max sa (ab + sb - aa)
+            LT -> max sa (ab + lb - aa)
-            GT -> max sb (aa + sa - ab)
+            GT -> max sb (aa + la - ab)
 
---------------------------------------------------------------------------------
+-- | A synonym for '(<<=)' with a tighter precedence and left-associativity for
+-- use with '(<~>)' in a sort of, comonadic pseudo-applicative style.
 
-data GetOrSet = Get | Set | GetSet
+(<<~) :: (Comonad w) => (w a -> b) -> w a -> w b
+(<<~) = (<<=)
 
-class CanGet (k :: GetOrSet)
+infixl 4 <<~
-class CanSet (k :: GetOrSet) where
 
-instance CanGet Get
+-- | Similar to '(<*>)', but with a cokleisli arrow.
-instance CanGet GetSet
-instance CanSet Set
-instance CanSet GetSet
 
-data GetSetLens (k :: GetOrSet) s t a b :: Type where
+(<~>) :: (Comonad w, Bind w) => w (w a -> b) -> w a -> w b
-    Getter_      :: (s -> a)             -> GetSetLens Get s t a b
+mc <~> ma = mc >>- \f -> ma =>> f
-    Setter_      :: ((a -> b) -> s -> t) -> GetSetLens Set s t a b
-    GetterSetter :: (CanGet k', CanSet k')
-                 => (s -> a) -> (s -> b -> t) -> GetSetLens k' s t a b
 
-type GetSetLens' k s a = GetSetLens k s s a a
+infixl 4 <~>
 
-class HasLocation k s | s -> k where
+-- this is getting silly
-    -- location :: (Access k f, Functor f) => LensLike' f s SrcSpan
-    getSetLocation :: GetSetLens' k s SrcSpan
 
-type family Access (k :: GetOrSet) f where
+(<#>) :: (Functor f) => f (a -> b) -> a -> f b
-    Access GetSet f = Functor f
+fab <#> a = fmap ($ a) fab
-    Access Set f = Settable f
-    Access Get f = (Functor f, Contravariant f)
 
-instance HasLocation GetSet SrcSpan where
+infixl 4 <#>
-    getSetLocation = GetterSetter id (flip const)
-    -- location = fromGetSetLens getSetLocation
-
-instance (CanSet k, HasLocation k a) => HasLocation Set (r -> a) where
-    getSetLocation = Setter_ $ \ss ra r -> ra r & fromSet getSetLocation %~ ss
-    -- location = fromSet getSetLocation
-
-instance (HasLocation k a) => HasLocation k (Cofree f a) where
-    getSetLocation = case getSetLocation @_ @a of
-        Getter_ sa -> Getter_ $ \ (s :< _) -> sa s
-        Setter_ abst -> Setter_ $ \ss (s :< as) -> abst ss s :< as
-        GetterSetter sa sbt -> GetterSetter sa' sbt' where
-            sa' (s :< _) = sa s
-            sbt' (s :< as) b = sbt s b :< as
-
-location :: (Access k f, Functor f, HasLocation k s)
-         => LensLike' f s SrcSpan
-location = fromGetSetLens getSetLocation
-
-fromGetSetLens :: (Access k f, Functor f) => GetSetLens' k s a -> LensLike' f s a
-fromGetSetLens gsl = case gsl of
-    Getter_ sa          -> to sa
-    Setter_ abst        -> setting abst
-    GetterSetter sa sbt -> lens sa sbt
-
-fromGet :: (CanGet k) => GetSetLens k s t a b -> Getter s a
-fromGet (Getter_ sa)        = to sa
-fromGet (GetterSetter sa _) = to sa
-
-fromSet :: (CanSet k) => GetSetLens k s t a b -> Setter s t a b
-fromSet (Setter_ abst)        = setting abst
-fromSet (GetterSetter sa sbt) = lens sa sbt
-
-fromGetSet :: (CanGet k, CanSet k) => GetSetLens k s t a b -> Lens s t a b
-fromGetSet (GetterSetter sa sbt) = lens sa sbt
-
---------------------------------------------------------------------------------
-
-comb2 :: (Functor f, Semigroup m)
-      => (Cofree f m -> Cofree f m -> f (Cofree f m))
-      -> Cofree f m -> Cofree f m -> Cofree f m
-comb2 f a b = ss :< f a b
-    where ss = a `mextract` b
-
-comb3 :: (Functor f, Semigroup m)
-      => (Cofree f m -> Cofree f m -> Cofree f m -> f (Cofree f m))
-      -> Cofree f m -> Cofree f m -> Cofree f m -> Cofree f m
-comb3 f a b c = ss :< f a b c
-    where ss = a `mapply` b `mextract` c
-
-comb4 :: (Functor f, Semigroup m)
-      => (Cofree f m -> Cofree f m -> Cofree f m -> Cofree f m
-         -> f (Cofree f m))
-      -> Cofree f m -> Cofree f m -> Cofree f m -> Cofree f m -> Cofree f m
-comb4 f a b c d = ss :< f a b c d
-    where ss = a `mapply` b `mapply` c `mextract` d
-
-mextract :: (Comonad w, Semigroup m) => w m -> w m -> m
-mextract = (<>) `on` extract
-
-mapply :: (Comonad w, Semigroup m) => w m -> w m -> w m
-mapply a b = b <&> (<> extract a)
-
-lochead :: Functor f
-        => (f SrcSpan -> f SrcSpan) -> Located (f SrcSpan) -> Cofree f SrcSpan
-lochead afs (Located ss fss) = ss :< unwrap (lochead afs $ Located ss fss)
-
---------------------------------------------------------------------------------
 
 makePrisms ''Located
+

src/GM.hs

@@ -11,6 +11,11 @@ module GM
     , evalProgR
     , GmState(..)
     , gmCode, gmStack, gmDump, gmHeap, gmEnv, gmStats
+    , stsReductions
+    , stsPrimReductions
+    , stsAllocations
+    , stsDereferences
+    , stsGCCycles
     , Node(..)
     , showState
     , gmEvalProg
@@ -29,10 +34,9 @@ import Data.Tuple                   (swap)
 import Control.Lens
 import Data.Text.Lens               (IsText, packed, unpacked)
 import Text.Printf
-import Text.PrettyPrint             hiding ((<>))
-import Text.PrettyPrint.HughesPJ    (maybeParens)
 import Data.Foldable                (traverse_)
 import System.IO                    (Handle, hPutStrLn)
+import Text.PrettyPrint             (render)
 -- TODO: an actual output system
 -- TODO: an actual output system
 -- TODO: an actual output system
@@ -41,9 +45,12 @@ import System.IO.Unsafe             (unsafePerformIO)
 import Data.String                  (IsString)
 import Data.Heap
 import Debug.Trace
+
 import Compiler.RLPC
 import Core2Core
 import Core
+import GM.Types
+import GM.Print
 ----------------------------------------------------------------------------------
 
 tag_Unit_unit :: Int
@@ -55,105 +62,19 @@ tag_Bool_True = 1
 tag_Bool_False :: Int
 tag_Bool_False = 0
 
-{-}
-
-hdbgProg = undefined
-evalProg = undefined
-
-data Node = NNum Int
-          | NAp Addr Addr
-          | NInd Addr
-          | NUninitialised
-          | NConstr Tag [Addr] -- NConstr Tag Components
-          | NMarked Node
-          deriving (Show, Eq)
-
---}
-
-data GmState = GmState
-    { _gmCode   :: Code
-    , _gmStack  :: Stack
-    , _gmDump   :: Dump
-    , _gmHeap   :: GmHeap
-    , _gmEnv    :: Env
-    , _gmStats  :: Stats
-    }
-    deriving Show
-
-type Code = [Instr]
-type Stack = [Addr]
-type Dump = [(Code, Stack)]
-type Env = [(Key, Addr)]
-type GmHeap = Heap Node
-
-data Key = NameKey Name
-         | ConstrKey Tag Int
-         deriving (Show, Eq)
-
--- >> [ref/Instr]
-data Instr = Unwind
-           | PushGlobal Name
-           | PushConstr Tag Int
-           | PushInt Int
-           | Push Int
-           | MkAp
-           | Slide Int
-           | Update Int
-           | Pop Int
-           | Alloc Int
-           | Eval
-           -- arith
-           | Neg | Add | Sub | Mul | Div
-           -- comparison
-           | Equals | Lesser | GreaterEq
-           | Pack Tag Int -- Pack Tag Arity
-           | CaseJump [(Tag, Code)]
-           | Split Int
-           | Print
-           | Halt
-           deriving (Show, Eq)
--- << [ref/Instr]
-
-data Node = NNum Int
-          | NAp Addr Addr
-          -- NGlobal is the GM equivalent of NSupercomb. rather than storing a
-          -- template to be instantiated, NGlobal holds the global's arity and
-          -- the pre-compiled code :3
-          | NGlobal Int Code
-          | NInd Addr
-          | NUninitialised
-          | NConstr Tag [Addr] -- NConstr Tag Components
-          | NMarked Node
-          deriving (Show, Eq)
-
--- TODO: log executed instructions
-data Stats = Stats
-    { _stsReductions     :: Int
-    , _stsPrimReductions :: Int
-    , _stsAllocations    :: Int
-    , _stsDereferences   :: Int
-    , _stsGCCycles       :: Int
-    }
-    deriving Show
-
-instance Default Stats where
-    def = Stats 0 0 0 0 0
-
--- TODO: _gmGlobals should not have a setter
-makeLenses ''GmState
-makeLenses ''Stats
-pure []
-
 ----------------------------------------------------------------------------------
 
-evalProg :: Program' -> Maybe (Node, Stats)
+evalProg :: Program' -> [GmState]
-evalProg p = res <&> (,sts)
+evalProg = eval . compile
-    where
+
-        final = eval (compile p) & last
+-- evalProg :: Program' -> Maybe (Node, Stats)
-        h = final ^. gmHeap
+-- evalProg p = res <&> (,sts)
-        sts = final ^. gmStats
+--     where
-        resAddr = final ^. gmStack ^? _head
+--         final = eval (compile p) & last
-        res = resAddr >>= flip hLookup h
+--         h = final ^. gmHeap
+--         sts = final ^. gmStats
+--         resAddr = final ^. gmStack ^? _head
+--         res = resAddr >>= flip hLookup h
 
 hdbgProg :: Program' -> Handle -> IO GmState
 hdbgProg p hio = do
@@ -815,185 +736,8 @@ buildInitialHeap (view programScDefs -> ss) = mapAccumL allocateSc mempty compil
         argOffset :: Int -> Env -> Env
         argOffset n = each . _2 %~ (+n)
 
-showCon :: (IsText a) => Tag -> Int -> a
-showCon t n = printf "Pack{%d %d}" t n ^. packed
-
 ----------------------------------------------------------------------------------
 
-pprTabstop :: Int
-pprTabstop = 4
-
-qquotes :: Doc -> Doc
-qquotes d = "`" <> d <> "'"
-
-showStats :: Stats -> Doc
-showStats sts = "==== Stats ============" $$ stats
-    where
-        stats = text $ printf
-            "Reductions      : %5d\n\
-            \Prim Reductions : %5d\n\
-            \Allocations     : %5d\n\
-            \GC Cycles       : %5d"
-            (sts ^. stsReductions)
-            (sts ^. stsPrimReductions)
-            (sts ^. stsAllocations)
-            (sts ^. stsGCCycles)
-
-showState :: GmState -> Doc
-showState st = vcat
-        [ "==== GmState " <> int stnum <> " "
-            <> text (replicate (28 - 13 - 1 - digitalWidth stnum) '=')
-        , "-- Next instructions -------"
-        , info $ showCodeShort c
-        , "-- Stack -------------------"
-        , info $ showStack st
-        , "-- Heap --------------------"
-        , info $ showHeap st
-        , "-- Dump --------------------"
-        , info $ showDump st
-        ]
-    where
-        stnum = st ^. (gmStats . stsReductions)
-        c = st ^. gmCode
-
-        -- indent data
-        info = nest pprTabstop
-
-showCodeShort :: Code -> Doc
-showCodeShort c = braces c'
-    where
-        c' | length c > 3 = list (showInstr <$> take 3 c) <> "; ..."
-           | otherwise    = list (showInstr <$> c)
-        list = hcat . punctuate "; "
-
-showStackShort :: Stack -> Doc
-showStackShort s = brackets s'
-    where
-           -- no access to heap, otherwise we'd use showNodeAt
-        s' | length s > 3 = list (showEntry <$> take 3 s) <> ", ..."
-           | otherwise    = list (showEntry <$> s)
-        list = hcat . punctuate ", "
-        showEntry = text . show
-
-showStack :: GmState -> Doc
-showStack st = vcat $ uncurry showEntry <$> si
-    where
-        h = st ^. gmHeap
-        s = st ^. gmStack
-
-        -- stack with labeled indices
-        si = [0..] `zip` s
-
-        w = maxWidth (addresses h)
-        showIndex n = padInt w n <> ": "
-
-        showEntry :: Int -> Addr -> Doc
-        showEntry n a = showIndex n <> showNodeAt st a
-
-showDump :: GmState -> Doc
-showDump st = vcat $ uncurry showEntry <$> di
-    where
-        d = st ^. gmDump
-        di = [0..] `zip` d
-
-        showIndex n = padInt w n <> ": "
-        w = maxWidth (fst <$> di)
-
-        showEntry :: Int -> (Code, Stack) -> Doc
-        showEntry n (c,s) = showIndex n <> nest pprTabstop entry
-            where
-                entry = ("Stack : " <> showCodeShort c)
-                     $$ ("Code  : " <> showStackShort s)
-
-padInt :: Int -> Int -> Doc
-padInt m n = text (replicate (m - digitalWidth n) ' ') <> int n
-
-maxWidth :: [Int] -> Int
-maxWidth ns = digitalWidth $ maximum ns
-
-digitalWidth :: Int -> Int
-digitalWidth = length . show
-
-showHeap :: GmState -> Doc
-showHeap st = vcat $ showEntry <$> addrs
-    where
-        showAddr n = padInt w n <> ": "
-
-        w = maxWidth addrs
-        h = st ^. gmHeap
-        addrs = addresses h
-
-        showEntry :: Addr -> Doc
-        showEntry a = showAddr a <> showNodeAt st a
-
-showNodeAt :: GmState -> Addr -> Doc
-showNodeAt = showNodeAtP 0
-
-showNodeAtP :: Int -> GmState -> Addr -> Doc
-showNodeAtP p st a = case hLookup a h of
-    Just (NNum n)        -> int n <> "#"
-    Just (NGlobal _ _)   -> textt name
-        where
-            g = st ^. gmEnv
-            name = case lookup a (swap <$> g) of
-                Just (NameKey n)     -> n
-                Just (ConstrKey t n) -> showCon t n
-                _                    -> errTxtInvalidAddress
-    -- TODO: left-associativity
-    Just (NAp f x)       -> pprec $ showNodeAtP (p+1) st f
-                                <+> showNodeAtP (p+1) st x
-    Just (NInd a')       -> pprec $ "NInd -> " <> showNodeAtP (p+1) st a'
-    Just (NConstr t as)  -> pprec $ "NConstr"
-                                <+> int t
-                                <+> brackets (list $ showNodeAtP 0 st <$> as)
-        where list = hcat . punctuate ", "
-    Just NUninitialised  -> "<uninitialised>"
-    Nothing              -> errTxtInvalidAddress
-    where
-        h = st ^. gmHeap
-        pprec = maybeParens (p > 0)
-
-showSc :: GmState -> (Name, Addr) -> Doc
-showSc st (k,a) = "Supercomb " <> qquotes (textt k) <> colon
-               $$ code
-    where
-        code = case hLookup a (st ^. gmHeap) of
-            Just (NGlobal _ c) -> showCode c
-            Just _             -> errTxtInvalidObject
-            Nothing            -> errTxtInvalidAddress
-
-errTxtInvalidObject, errTxtInvalidAddress :: (IsString a) => a
-errTxtInvalidObject = "<invalid object>"
-errTxtInvalidAddress = "<invalid address>"
-
-showCode :: Code -> Doc
-showCode c = "Code" <+> braces instrs
-    where instrs = vcat $ showInstr <$> c
-
-showInstr :: Instr -> Doc
-showInstr (CaseJump alts) = "CaseJump" $$ nest pprTabstop alternatives
-    where
-        showAlt (t,c) = "<" <> int t <> ">" <> showCodeShort c
-        alternatives = foldr (\a acc -> showAlt a $$ acc) mempty alts
-showInstr i = text $ show i
-
-textt :: (IsText a) => a -> Doc
-textt t = t ^. unpacked & text
-
-----------------------------------------------------------------------------------
-
-lookupN :: Name -> Env -> Maybe Addr
-lookupN k = lookup (NameKey k)
-
-lookupC :: Tag -> Int -> Env -> Maybe Addr
-lookupC t n = lookup (ConstrKey t n)
-
-----------------------------------------------------------------------------------
-
-gc :: GmState -> GmState
-gc st = (sweepNodes . markNodes $ st)
-      & gmStats . stsGCCycles %~ succ
-
 markNodes :: GmState -> GmState
 markNodes st = st & gmHeap %~ thread (markFrom <$> roots)
     where
@@ -1036,6 +780,18 @@ sweepNodes st = st & gmHeap %~ thread (f <$> addresses h)
 thread :: [a -> a] -> (a -> a)
 thread = appEndo . foldMap Endo
 
+gc :: GmState -> GmState
+gc st = (sweepNodes . markNodes $ st)
+      & gmStats . stsGCCycles %~ succ
+
+--------------------------------------------------------------------------------
+
+lookupN :: Name -> Env -> Maybe Addr
+lookupN k = lookup (NameKey k)
+
+lookupC :: Tag -> Int -> Env -> Maybe Addr
+lookupC t n = lookup (ConstrKey t n)
+
 ----------------------------------------------------------------------------------
 
 gmEvalProg :: Program' -> GmState
@@ -1047,8 +803,7 @@ finalStateOf f = f . gmEvalProg
 resultOf :: Program' -> Maybe Node
 resultOf p = do
     a <- res
-    n <- hLookup a h
+    hLookup a h
-    pure n
   where
     res = st ^? gmStack . _head
     st = gmEvalProg p

src/GM/Print.hs

@@ -0,0 +1,186 @@
+module GM.Print
+    ( showState
+    , showStats
+    , showNodeAt
+    )
+    where
+--------------------------------------------------------------------------------
+import Data.Monoid
+import Data.String              (IsString(..))
+import Data.Text.Lens           (IsText, packed, unpacked)
+import Text.Printf
+
+import Text.PrettyPrint             hiding ((<>))
+import Text.PrettyPrint.HughesPJ    (maybeParens)
+import Control.Lens
+
+import Data.Heap
+import Core.Syntax
+import GM.Types
+--------------------------------------------------------------------------------
+
+pprTabstop :: Int
+pprTabstop = 4
+
+qquotes :: Doc -> Doc
+qquotes d = "`" <> d <> "'"
+
+showStats :: Stats -> Doc
+showStats sts = "==== Stats ============" $$ stats
+    where
+        stats = text $ printf
+            "Reductions      : %5d\n\
+            \Prim Reductions : %5d\n\
+            \Allocations     : %5d\n\
+            \GC Cycles       : %5d"
+            (sts ^. stsReductions)
+            (sts ^. stsPrimReductions)
+            (sts ^. stsAllocations)
+            (sts ^. stsGCCycles)
+
+showState :: GmState -> Doc
+showState st = vcat
+        [ "==== GmState " <> int stnum <> " "
+            <> text (replicate (28 - 13 - 1 - digitalWidth stnum) '=')
+        , "-- Next instructions -------"
+        , info $ showCodeShort c
+        , "-- Stack -------------------"
+        , info $ showStack st
+        , "-- Heap --------------------"
+        , info $ showHeap st
+        , "-- Dump --------------------"
+        , info $ showDump st
+        ]
+    where
+        stnum = st ^. (gmStats . stsReductions)
+        c = st ^. gmCode
+
+        -- indent data
+        info = nest pprTabstop
+
+showCodeShort :: Code -> Doc
+showCodeShort c = braces c'
+    where
+        c' | length c > 3 = list (showInstr <$> take 3 c) <> "; ..."
+           | otherwise    = list (showInstr <$> c)
+        list = hcat . punctuate "; "
+
+showStackShort :: Stack -> Doc
+showStackShort s = brackets s'
+    where
+           -- no access to heap, otherwise we'd use showNodeAt
+        s' | length s > 3 = list (showEntry <$> take 3 s) <> ", ..."
+           | otherwise    = list (showEntry <$> s)
+        list = hcat . punctuate ", "
+        showEntry = text . show
+
+showStack :: GmState -> Doc
+showStack st = vcat $ uncurry showEntry <$> si
+    where
+        h = st ^. gmHeap
+        s = st ^. gmStack
+
+        -- stack with labeled indices
+        si = [0..] `zip` s
+
+        w = maxWidth (addresses h)
+        showIndex n = padInt w n <> ": "
+
+        showEntry :: Int -> Addr -> Doc
+        showEntry n a = showIndex n <> showNodeAt st a
+
+showDump :: GmState -> Doc
+showDump st = vcat $ uncurry showEntry <$> di
+    where
+        d = st ^. gmDump
+        di = [0..] `zip` d
+
+        showIndex n = padInt w n <> ": "
+        w = maxWidth (fst <$> di)
+
+        showEntry :: Int -> (Code, Stack) -> Doc
+        showEntry n (c,s) = showIndex n <> nest pprTabstop entry
+            where
+                entry = ("Stack : " <> showCodeShort c)
+                     $$ ("Code  : " <> showStackShort s)
+
+padInt :: Int -> Int -> Doc
+padInt m n = text (replicate (m - digitalWidth n) ' ') <> int n
+
+maxWidth :: [Int] -> Int
+maxWidth ns = digitalWidth $ maximum ns
+
+digitalWidth :: Int -> Int
+digitalWidth = length . show
+
+showHeap :: GmState -> Doc
+showHeap st = vcat $ showEntry <$> addrs
+    where
+        showAddr n = padInt w n <> ": "
+
+        w = maxWidth addrs
+        h = st ^. gmHeap
+        addrs = addresses h
+
+        showEntry :: Addr -> Doc
+        showEntry a = showAddr a <> showNodeAt st a
+
+showNodeAt :: GmState -> Addr -> Doc
+showNodeAt = showNodeAtP 0
+
+showNodeAtP :: Int -> GmState -> Addr -> Doc
+showNodeAtP p st a = case hLookup a h of
+    Just (NNum n)        -> int n <> "#"
+    Just (NGlobal _ _)   -> textt name
+        where
+            g = st ^. gmEnv
+            name = case lookup a (view swapped <$> g) of
+                Just (NameKey n)     -> n
+                Just (ConstrKey t n) -> showCon t n
+                _                    -> errTxtInvalidAddress
+    -- TODO: left-associativity
+    Just (NAp f x)       -> pprec $ showNodeAtP (p+1) st f
+                                <+> showNodeAtP (p+1) st x
+    Just (NInd a')       -> pprec $ "NInd -> " <> showNodeAtP (p+1) st a'
+    Just (NConstr t as)  -> pprec $ "NConstr"
+                                <+> int t
+                                <+> brackets (list $ showNodeAtP 0 st <$> as)
+        where list = hcat . punctuate ", "
+    Just NUninitialised  -> "<uninitialised>"
+    Nothing              -> errTxtInvalidAddress
+    where
+        h = st ^. gmHeap
+        pprec = maybeParens (p > 0)
+
+showSc :: GmState -> (Name, Addr) -> Doc
+showSc st (k,a) = "Supercomb " <> qquotes (textt k) <> colon
+               $$ code
+    where
+        code = case hLookup a (st ^. gmHeap) of
+            Just (NGlobal _ c) -> showCode c
+            Just _             -> errTxtInvalidObject
+            Nothing            -> errTxtInvalidAddress
+
+errTxtInvalidObject, errTxtInvalidAddress :: (IsString a) => a
+errTxtInvalidObject = "<invalid object>"
+errTxtInvalidAddress = "<invalid address>"
+
+showCode :: Code -> Doc
+showCode c = "Code" <+> braces instrs
+    where instrs = vcat $ showInstr <$> c
+
+showInstr :: Instr -> Doc
+showInstr (CaseJump alts) = "CaseJump" $$ nest pprTabstop alternatives
+    where
+        showAlt (t,c) = "<" <> int t <> ">" <> showCodeShort c
+        alternatives = foldr (\a acc -> showAlt a $$ acc) mempty alts
+showInstr i = text $ show i
+
+textt :: (IsText a) => a -> Doc
+textt t = t ^. unpacked & text
+
+----------------------------------------------------------------------------------
+
+showCon :: (IsText a) => Tag -> Int -> a
+showCon t n = printf "Pack{%d %d}" t n ^. packed
+

src/GM/Types.hs

@@ -0,0 +1,83 @@
+{-# LANGUAGE TemplateHaskell #-}
+module GM.Types where
+--------------------------------------------------------------------------------
+import Control.Lens.Combinators
+import Data.Heap
+import Data.Default
+
+import Core.Syntax
+--------------------------------------------------------------------------------
+
+data GmState = GmState
+    { _gmCode   :: Code
+    , _gmStack  :: Stack
+    , _gmDump   :: Dump
+    , _gmHeap   :: GmHeap
+    , _gmEnv    :: Env
+    , _gmStats  :: Stats
+    }
+    deriving Show
+
+type Code = [Instr]
+type Stack = [Addr]
+type Dump = [(Code, Stack)]
+type Env = [(Key, Addr)]
+type GmHeap = Heap Node
+
+data Key = NameKey Name
+         | ConstrKey Tag Int
+         deriving (Show, Eq)
+
+-- >> [ref/Instr]
+data Instr = Unwind
+           | PushGlobal Name
+           | PushConstr Tag Int
+           | PushInt Int
+           | Push Int
+           | MkAp
+           | Slide Int
+           | Update Int
+           | Pop Int
+           | Alloc Int
+           | Eval
+           -- arith
+           | Neg | Add | Sub | Mul | Div
+           -- comparison
+           | Equals | Lesser | GreaterEq
+           | Pack Tag Int -- Pack Tag Arity
+           | CaseJump [(Tag, Code)]
+           | Split Int
+           | Print
+           | Halt
+           deriving (Show, Eq)
+-- << [ref/Instr]
+
+data Node = NNum Int
+          | NAp Addr Addr
+          -- NGlobal is the GM equivalent of NSupercomb. rather than storing a
+          -- template to be instantiated, NGlobal holds the global's arity and
+          -- the pre-compiled code :3
+          | NGlobal Int Code
+          | NInd Addr
+          | NUninitialised
+          | NConstr Tag [Addr] -- NConstr Tag Components
+          | NMarked Node
+          deriving (Show, Eq)
+
+-- TODO: log executed instructions
+data Stats = Stats
+    { _stsReductions     :: Int
+    , _stsPrimReductions :: Int
+    , _stsAllocations    :: Int
+    , _stsDereferences   :: Int
+    , _stsGCCycles       :: Int
+    }
+    deriving Show
+
+instance Default Stats where
+    def = Stats 0 0 0 0 0
+
+-- TODO: _gmGlobals should not have a setter
+makeLenses ''GmState
+makeLenses ''Stats
+

src/GM/Visual.hs

@@ -0,0 +1,54 @@
+{-# LANGUAGE NoMonomorphismRestriction #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE UndecidableInstances #-}
+module GM.Visual
+    ( renderGmState
+    )
+    where
+--------------------------------------------------------------------------------
+import Text.Printf
+import Data.Function            ((&), on)
+import Text.PrettyPrint         qualified as P
+
+import Diagrams.Prelude
+import Diagrams.Backend.Cairo
+
+import GM.Types
+import GM.Print
+--------------------------------------------------------------------------------
+
+renderGmState :: GmState -> IO ()
+renderGmState st = renderCairo path size (drawState st)
+    where
+        size = mkSizeSpec2D (Just 1000) (Just 1000)
+        path = printf "/tmp/render/%04d.png" n
+        n = st ^. gmStats . stsReductions
+
+drawState :: GmState -> Diagram B
+drawState = drawStack
+
+drawStack :: GmState -> Diagram B
+drawStack st = st & vcatOf (gmStack . each . to cell)
+    where
+        cell a = rect 10 5
+              <> text (printf "%04x: %s" a (P.render . showNodeAt st $ a))
+
+vcatOf :: (InSpace V2 n a, Floating n, Juxtaposable a, HasOrigin a, Monoid' a)
+       => Getting (Endo [a]) s a -> s -> a
+vcatOf l = vcat . (^.. l)
+
+newtype Vap a = Vap { getVap :: a }
+
+instance (InSpace V2 n a, Juxtaposable a, Semigroup a)
+         => Semigroup (Vap a) where (<>) = (Vap .) . ((===) `on` getVap)
+instance (InSpace V2 n a, Juxtaposable a, Monoid a)
+         => Monoid (Vap a) where mempty = Vap mempty
+
+newtype Hap a = Hap { getHap :: a }
+
+instance (InSpace V2 n a, Juxtaposable a, Semigroup a)
+         => Semigroup (Hap a) where (<>) = (Hap .) . ((|||) `on` getHap)
+instance (InSpace V2 n a, Juxtaposable a, Monoid a)
+         => Monoid (Hap a) where mempty = Hap mempty
+

src/Rlp/Lex.x

@@ -8,7 +8,6 @@ module Rlp.Lex
     , Located(..)
     , lexToken
     , lexStream
-    , lexStream'
     , lexDebug
     , lexCont
     , popLexState
@@ -30,7 +29,6 @@ import Data.Word
 import Data.Default
 import Control.Lens
 
-import Compiler.Types
 import Debug.Trace
 import Rlp.Parse.Types
 }
@@ -276,12 +274,11 @@ lexCont :: (Located RlpToken -> P a) -> P a
 lexCont = (lexToken >>=)
 
 lexStream :: P [RlpToken]
-lexStream = fmap extract <$> lexStream'
+lexStream = do
-
+    t <- lexToken
-lexStream' :: P [Located RlpToken]
+    case t of
-lexStream' = lexToken >>= \case
+        Located _ TokenEOF -> pure [TokenEOF]
-    t@(Located _ TokenEOF) -> pure [t]
+        Located _ t        -> (t:) <$> lexStream
-    t        -> (t:) <$> lexStream'
 
 lexDebug :: (Located RlpToken -> P a) -> P a
 lexDebug k = do

src/Rlp/Parse.y

@@ -5,17 +5,15 @@ module Rlp.Parse
     , parseRlpProgR
     , parseRlpExpr
     , parseRlpExprR
-    , runP'
     )
     where
 import Compiler.RlpcError
 import Compiler.RLPC
-import Control.Comonad.Cofree
 import Rlp.Lex
 import Rlp.Syntax
 import Rlp.Parse.Types
 import Rlp.Parse.Associate
-import Control.Lens                 hiding (snoc, (.>), (<.), (<<~), (:<))
+import Control.Lens                 hiding (snoc, (.>), (<.), (<<~))
 import Data.List.Extra
 import Data.Fix
 import Data.Functor.Const
@@ -73,11 +71,12 @@ import Compiler.Types
 
 %%
 
-StandaloneProgram   :: { Program RlpcPs SrcSpan }
+StandaloneProgram   :: { RlpProgram RlpcPs }
-StandaloneProgram   : layout0(Decl)         {% mkProgram $1 }
+StandaloneProgram   : '{' Decls  '}'        {% mkProgram $2 }
+                    | VL  DeclsV VR         {% mkProgram $2 }
 
-StandaloneExpr      :: { Expr' RlpcPs SrcSpan }
+StandaloneExpr      :: { RlpExpr RlpcPs }
-                    : VL Expr VR            { $2 }
+                    : VL Expr VR            { extract $2 }
 
 VL  :: { () }
 VL  : vlbrace       { () }
@@ -86,105 +85,125 @@ VR  :: { () }
 VR  : vrbrace       { () }
     | error         { () }
 
-VS                  :: { () }
+Decls               :: { [Decl' RlpcPs] }
-VS                  : ';'                   { () }
+Decls               : Decl ';' Decls        { $1 : $3 }
-                    | vsemi                 { () }
+                    | Decl ';'              { [$1] }
+                    | Decl                  { [$1] }
 
-Decl        :: { Decl RlpcPs SrcSpan }
+DeclsV              :: { [Decl' RlpcPs] }
+DeclsV              : Decl VS DeclsV        { $1 : $3 }
+                    | Decl VS               { [$1] }
+                    | Decl                  { [$1] }
+
+VS                  :: { Located RlpToken }
+VS                  : ';'                   { $1 }
+                    | vsemi                 { $1 }
+
+Decl        :: { Decl' RlpcPs }
             : FunDecl                   { $1 }
             | TySigDecl                 { $1 }
             | DataDecl                  { $1 }
             | InfixDecl                 { $1 }
 
-TySigDecl   :: { Decl RlpcPs SrcSpan }
+TySigDecl   :: { Decl' RlpcPs }
-            : Var '::' Type             { TySigD [$1] $3 }
+            : Var '::' Type             { (\e -> TySigD [extract e]) <<~ $1 <~> $3 }
 
-InfixDecl   :: { Decl RlpcPs SrcSpan }
+InfixDecl   :: { Decl' RlpcPs }
-            : InfixWord litint InfixOp  {% mkInfixD $1 ($2 ^. _litint) $3 }
+            : InfixWord litint InfixOp  { $1 =>> \w ->
+                                          InfixD (extract $1) (extractInt $ extract $2)
+                                          (extract $3) }
 
-InfixWord   :: { Assoc }
+InfixWord   :: { Located Assoc }
-            : infixl                    { InfixL }
+            : infixl                    { $1 \$> InfixL }
-            | infixr                    { InfixR }
+            | infixr                    { $1 \$> InfixR }
-            | infix                     { Infix }
+            | infix                     { $1 \$> Infix  }
 
-DataDecl    :: { Decl RlpcPs SrcSpan }
+DataDecl    :: { Decl' RlpcPs }
-            : data Con TyParams '=' DataCons    { DataD $2 $3 $5 }
+            : data Con TyParams '=' DataCons    { $1 \$> DataD (extract $2) $3 $5 }
 
 TyParams    :: { [PsName] }
             : {- epsilon -}             { [] }
-            | TyParams varname          { $1 `snoc` extractName $2 }
+            | TyParams varname          { $1 `snoc` (extractName . extract $ $2) }
 
 DataCons    :: { [ConAlt RlpcPs] }
             : DataCons '|' DataCon      { $1 `snoc` $3 }
             | DataCon                   { [$1] }
 
 DataCon     :: { ConAlt RlpcPs }
-            : Con Type1s                { ConAlt $1 $2 }
+            : Con Type1s                { ConAlt (extract $1) $2 }
 
-Type1s      :: { [Ty RlpcPs] }
+Type1s      :: { [RlpType' RlpcPs] }
             : {- epsilon -}             { [] }
             | Type1s Type1              { $1 `snoc` $2 }
 
-Type1       :: { Ty RlpcPs }
+Type1       :: { RlpType' RlpcPs }
             : '(' Type ')'              { $2 }
-            | conname                   { ConT (extractName $1) }
+            | conname                   { fmap ConT (mkPsName $1) }
-            | varname                   { VarT (extractName $1) }
+            | varname                   { fmap VarT (mkPsName $1) }
 
-Type        :: { Ty RlpcPs }
+Type        :: { RlpType' RlpcPs }
-            : Type '->' Type            { FunT $1 $3 }
+            : Type '->' Type            { FunT <<~ $1 <~> $3 }
             | TypeApp                   { $1 }
 
-TypeApp     :: { Ty RlpcPs }
+TypeApp     :: { RlpType' RlpcPs }
             : Type1                     { $1 }
-            | TypeApp Type1             { AppT $1 $2 }
+            | TypeApp Type1             { AppT <<~ $1 <~> $2 }
 
-FunDecl     :: { Decl RlpcPs SrcSpan }
+FunDecl     :: { Decl' RlpcPs }
-FunDecl     : Var Params '=' Expr       { FunD $1 $2 $4 Nothing }
+FunDecl     : Var Params '=' Expr       { $4 =>> \e ->
+                                          FunD (extract $1) $2 e Nothing }
 
-Params      :: { [Pat RlpcPs] }
+Params      :: { [Pat' RlpcPs] }
 Params      : {- epsilon -}             { [] }
             | Params Pat1               { $1 `snoc` $2 }
 
-Pat         :: { Pat RlpcPs }
+Pat         :: { Pat' RlpcPs }
-            : Con Pat1s                 { ConP $1 $2 }
+            : Con Pat1s                 { $1 =>> \cn ->
+                                          ConP (extract $1) $2 }
             | Pat1                      { $1 }
 
-Pat1s       :: { [Pat RlpcPs] }
+Pat1s       :: { [Pat' RlpcPs] }
             : Pat1s Pat1                { $1 `snoc` $2 }
             | Pat1                      { [$1] }
 
-Pat1        :: { Pat RlpcPs }
+Pat1        :: { Pat' RlpcPs }
-            : Con                       { ConP $1 [] }
+            : Con                       { fmap (`ConP` []) $1 }
-            | Var                       { VarP $1 }
+            | Var                       { fmap VarP $1 }
-            | Lit                       { LitP $1 }
+            | Lit                       { LitP <<= $1 }
-            | '(' Pat ')'               { $2 }
+            | '(' Pat ')'               { $1 .> $2 <. $3 }
 
-Expr        :: { Expr' RlpcPs SrcSpan }
+Expr        :: { RlpExpr' RlpcPs }
             -- infixities delayed till next release :(
-            -- : Expr1 InfixOp Expr        { undefined }
+            -- : Expr1 InfixOp Expr        { $2 =>> \o ->
-            : AppExpr                   { $1 }
+            --                              OAppE (extract o) $1 $3 }
-            | TempInfixExpr             { $1 }
+            : TempInfixExpr             { $1 }
             | LetExpr                   { $1 }
             | CaseExpr                  { $1 }
+            | AppExpr                   { $1 }
 
-TempInfixExpr :: { Expr' RlpcPs SrcSpan }
+TempInfixExpr :: { RlpExpr' RlpcPs }
 TempInfixExpr : Expr1 InfixOp TempInfixExpr {% tempInfixExprErr $1 $3 }
-              | Expr1 InfixOp Expr1         { nolo' $ InfixEF $2 $1 $3 }
+              | Expr1 InfixOp Expr1 { $2 =>> \o ->
+                                      OAppE (extract o) $1 $3 }
 
-AppExpr     :: { Expr' RlpcPs SrcSpan }
+AppExpr     :: { RlpExpr' RlpcPs }
             : Expr1                     { $1 }
-            | AppExpr Expr1             { comb2 AppEF $1 $2 }
+            | AppExpr Expr1             { AppE <<~ $1 <~> $2 }
 
-LetExpr     :: { Expr' RlpcPs SrcSpan }
+LetExpr     :: { RlpExpr' RlpcPs }
-            : let layout1(Binding) in Expr      { nolo' $ LetEF NonRec $2 $4 }
+            : let layout1(Binding) in Expr      { $1 \$> LetE $2 $4 }
-            | letrec layout1(Binding) in Expr   { nolo' $ LetEF Rec $2 $4 }
+            | letrec layout1(Binding) in Expr   { $1 \$> LetrecE $2 $4 }
 
-CaseExpr    :: { Expr' RlpcPs SrcSpan }
+CaseExpr    :: { RlpExpr' RlpcPs }
-            : case Expr of layout0(Alt)     { nolo' $ CaseEF $2 $4 }
+            : case Expr of layout0(CaseAlt)
+                { CaseE <<~ $2 <#> $4 }
 
 -- TODO: where-binds
-Alt         :: { Alt' RlpcPs SrcSpan }
+CaseAlt     :: { (Alt RlpcPs, Where RlpcPs) }
-            : Pat '->' Expr                 { AltA $1 (view _unwrap $3) Nothing }
+            : Alt                           { ($1, []) }
+
+Alt         :: { Alt RlpcPs }
+            : Pat '->' Expr                 { AltA $1 $3 }
 
 -- layout0(p : β) :: [β]
 layout0(p)  : '{' layout_list0(';',p) '}'   { $2 }
@@ -203,68 +222,38 @@ layout1(p)  : '{' layout_list1(';',p) '}'   { $2 }
 layout_list1(sep,p) : p                          { [$1] }
                     | layout_list1(sep,p) sep p  { $1 `snoc` $3 }
 
-Binding     :: { Binding' RlpcPs SrcSpan }
+Binding     :: { Binding' RlpcPs }
-            : Pat '=' Expr              { PatB $1 (view _unwrap $3) }
+            : Pat '=' Expr              { PatB <<~ $1 <~> $3 }
 
-Expr1       :: { Expr' RlpcPs SrcSpan }
+Expr1       :: { RlpExpr' RlpcPs }
-            : '(' Expr ')'              { $2 }
+            : '(' Expr ')'              { $1 .> $2 <. $3 }
-            | Lit                       { nolo' $ LitEF $1 }
+            | Lit                       { fmap LitE $1 }
-            | Var                       { case $1 of Located ss _ -> ss :< VarEF $1 }
+            | Var                       { fmap VarE $1 }
-            | Con                       { case $1 of Located ss _ -> ss :< VarEF $1 }
+            | Con                       { fmap VarE $1 }
 
-InfixOp     :: { PsName }
+InfixOp     :: { Located PsName }
-            : consym                    { extractName $1 }
+            : consym                    { mkPsName $1 }
-            | varsym                    { extractName $1 }
+            | varsym                    { mkPsName $1 }
 
 -- TODO: microlens-pro save me microlens-pro (rewrite this with prisms)
-Lit         :: { Lit RlpcPs }
+Lit         :: { Lit' RlpcPs }
-            : litint                    { $1 ^. to extract
+            : litint                    { $1 <&> (IntL . (\ (TokenLitInt n) -> n)) }
-                                              . singular _TokenLitInt
-                                              . to IntL }
 
-Var         :: { PsName }
+Var         :: { Located PsName }
-Var         : varname                   { $1 <&> view (singular _TokenVarName) }
+Var         : varname                   { mkPsName $1 }
-            | varsym                    { $1 <&> view (singular _TokenVarSym) }
+            | varsym                    { mkPsName $1 }
 
-Con         :: { PsName }
+Con         :: { Located PsName }
-            : conname                   { $1 <&> view (singular _TokenConName) }
+            : conname                   { mkPsName $1 }
 
 {
 
-parseRlpProgR :: (Monad m) => Text -> RLPCT m (Program RlpcPs SrcSpan)
+parseRlpExprR :: (Monad m) => Text -> RLPCT m (RlpExpr RlpcPs)
-parseRlpProgR s = do
-    a <- liftErrorful $ pToErrorful parseRlpProg st
-    addDebugMsg @_ @String "dump-parsed" $ show a
-    pure a
-  where
-    st = programInitState s
-
-parseRlpExprR :: (Monad m) => Text -> RLPCT m (Expr' RlpcPs SrcSpan)
 parseRlpExprR s = liftErrorful $ pToErrorful parseRlpExpr st
     where
         st = programInitState s
 
-mkInfixD :: Assoc -> Int -> PsName -> P (Decl RlpcPs SrcSpan)
+parseRlpProgR :: (Monad m) => Text -> RLPCT m (RlpProgram RlpcPs)
-mkInfixD a p ln@(Located ss n) = do
-    let opl :: Lens' ParseState (Maybe OpInfo)
-        opl = psOpTable . at n
-    opl <~ (use opl >>= \case
-        Just o  -> addWoundHere l e >> pure (Just o) where
-            e = RlpParErrDuplicateInfixD n
-            l = T.length n
-        Nothing -> pure (Just (a,p))
-        )
-    pos <- use (psInput . aiPos)
-    pure $ InfixD a p ln
-
-{--
-
-parseRlpExprR :: (Monad m) => Text -> RLPCT m (Expr RlpcPs)
-parseRlpExprR s = liftErrorful $ pToErrorful parseRlpExpr st
-    where
-        st = programInitState s
-
-parseRlpProgR :: (Monad m) => Text -> RLPCT m (Program RlpcPs)
 parseRlpProgR s = do
     a <- liftErrorful $ pToErrorful parseRlpProg st
     addDebugMsg @_ @String "dump-parsed" $ show a
@@ -287,48 +276,37 @@ extractInt :: RlpToken -> Int
 extractInt (TokenLitInt n) = n
 extractInt _ = error "extractInt: ugh"
 
-mkProgram :: [Decl RlpcPs SrcSpan] -> P (Program RlpcPs SrcSpan)
+mkProgram :: [Decl' RlpcPs] -> P (RlpProgram RlpcPs)
 mkProgram ds = do
     pt <- use psOpTable
-    pure $ Program (associate pt <$> ds)
+    pure $ RlpProgram (associate pt <$> ds)
+
+parseError :: (Located RlpToken, [String]) -> P a
+parseError ((Located ss t), exp) = addFatal $
+    errorMsg ss (RlpParErrUnexpectedToken t exp)
+
+mkInfixD :: Assoc -> Int -> PsName -> P (Decl' RlpcPs)
+mkInfixD a p n = do
+    let opl :: Lens' ParseState (Maybe OpInfo)
+        opl = psOpTable . at n
+    opl <~ (use opl >>= \case
+        Just o  -> addWoundHere l e >> pure (Just o) where
+            e = RlpParErrDuplicateInfixD n
+            l = T.length n
+        Nothing -> pure (Just (a,p))
+        )
+    pos <- use (psInput . aiPos)
+    pure $ Located (spanFromPos pos 0) (InfixD a p n)
 
 intOfToken :: Located RlpToken -> Int
 intOfToken (Located _ (TokenLitInt n)) = n
 
-tempInfixExprErr :: Expr RlpcPs -> Expr RlpcPs -> P a
+tempInfixExprErr :: RlpExpr' RlpcPs -> RlpExpr' RlpcPs -> P a
 tempInfixExprErr (Located a _) (Located b _) =
     addFatal $ errorMsg (a <> b) $ RlpParErrOther
         [ "The rl' frontend is currently in beta. Support for infix expressions is minimal, sorry! :("
         , "In the mean time, don't mix any infix operators."
         ]
 
---}
-
-_litint :: Getter (Located RlpToken) Int
-_litint = to extract
-        . singular _TokenLitInt
-
-tempInfixExprErr :: Expr' RlpcPs SrcSpan -> Expr' RlpcPs SrcSpan -> P a
-tempInfixExprErr (a :< _) (b :< _) =
-    addFatal $ errorMsg (a <> b) $ RlpParErrOther
-        [ "The rl' frontend is currently in beta. Support for infix expressions is minimal, sorry! :("
-        , "In the mean time, don't mix any infix operators."
-        ]
-
-mkProgram :: [Decl RlpcPs SrcSpan] -> P (Program RlpcPs SrcSpan)
-mkProgram ds = do
-    pt <- use psOpTable
-    pure $ Program (associate pt <$> ds)
-
-extractName :: Located RlpToken -> PsName
-extractName (Located ss (TokenVarSym n)) = Located ss n
-extractName (Located ss (TokenVarName n)) = Located ss n
-extractName (Located ss (TokenConName n)) = Located ss n
-extractName (Located ss (TokenConSym n)) = Located ss n
-
-parseError :: (Located RlpToken, [String]) -> P a
-parseError ((Located ss t), exp) = addFatal $
-    errorMsg ss (RlpParErrUnexpectedToken t exp)
-
 }
 

src/Rlp/Parse/Associate.hs

@@ -16,7 +16,7 @@ import Rlp.Parse.Types
 import Rlp.Syntax
 --------------------------------------------------------------------------------
 
-associate :: OpTable -> Decl RlpcPs a -> Decl RlpcPs a
+associate :: OpTable -> Decl' RlpcPs -> Decl' RlpcPs
 associate _ p = p
 
 {-# WARNING associate "unimplemented" #-}

src/Rlp/Parse/Types.hs

@@ -1,7 +1,6 @@
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE ImplicitParams, ViewPatterns, PatternSynonyms #-}
 {-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE UndecidableInstances #-}
 module Rlp.Parse.Types
     (
     -- * Trees That Grow
@@ -18,9 +17,10 @@ module Rlp.Parse.Types
     , RlpToken(..), AlexInput(..), Position(..), spanFromPos, LexerAction
     , Located(..), PsName
     -- ** Lenses
-    , _TokenLitInt, _TokenVarName, _TokenConName, _TokenVarSym
     , aiPrevChar, aiSource, aiBytes, aiPos, posLine, posColumn
 
+    , (<<~), (<~>)
+
     -- * Error handling
     , MsgEnvelope(..), RlpcError(..), RlpParseError(..)
     , addFatal, addWound, addFatalHere, addWoundHere
@@ -28,7 +28,6 @@ module Rlp.Parse.Types
     where
 --------------------------------------------------------------------------------
 import Core.Syntax                  (Name)
-import Text.Show.Deriving
 import Control.Monad
 import Control.Monad.State.Strict
 import Control.Monad.Errorful
@@ -54,9 +53,34 @@ import Compiler.Types
 
 data RlpcPs
 
-type instance NameP RlpcPs = PsName
+type instance XRec RlpcPs a = Located a
+type instance IdP RlpcPs = PsName
 
-type PsName = Located Text
+type instance XFunD RlpcPs = ()
+type instance XDataD RlpcPs = ()
+type instance XInfixD RlpcPs = ()
+type instance XTySigD RlpcPs = ()
+type instance XXDeclD RlpcPs = ()
+
+type instance XLetE RlpcPs = ()
+type instance XLetrecE RlpcPs = ()
+type instance XVarE RlpcPs = ()
+type instance XLamE RlpcPs = ()
+type instance XCaseE RlpcPs = ()
+type instance XIfE RlpcPs = ()
+type instance XAppE RlpcPs = ()
+type instance XLitE RlpcPs = ()
+type instance XParE RlpcPs = ()
+type instance XOAppE RlpcPs = ()
+type instance XXRlpExprE RlpcPs = ()
+
+type PsName = Text
+
+instance MapXRec RlpcPs where
+    mapXRec = fmap
+
+instance UnXRec RlpcPs where
+    unXRec = extract
 
 --------------------------------------------------------------------------------
 
@@ -94,10 +118,10 @@ data RlpToken
     -- literals
     = TokenLitInt Int
     -- identifiers
-    | TokenVarName Text
+    | TokenVarName Name
-    | TokenConName Text
+    | TokenConName Name
-    | TokenVarSym Text
+    | TokenVarSym Name
-    | TokenConSym Text
+    | TokenConSym Name
     -- reserved words
     | TokenData
     | TokenCase
@@ -128,31 +152,6 @@ data RlpToken
     | TokenEOF
     deriving (Show)
 
-_TokenLitInt :: Prism' RlpToken Int
-_TokenLitInt = prism TokenLitInt $ \case
-    TokenLitInt n -> Right n
-    x             -> Left x
-
-_TokenVarName :: Prism' RlpToken Text
-_TokenVarName = prism TokenVarName $ \case
-    TokenVarName n -> Right n
-    x              -> Left x
-
-_TokenVarSym :: Prism' RlpToken Text
-_TokenVarSym = prism TokenVarSym $ \case
-    TokenVarSym n -> Right n
-    x              -> Left x
-
-_TokenConName :: Prism' RlpToken Text
-_TokenConName = prism TokenConName $ \case
-    TokenConName n -> Right n
-    x              -> Left x
-
-_TokenConSym :: Prism' RlpToken Text
-_TokenConSym = prism TokenConSym $ \case
-    TokenConSym n -> Right n
-    x              -> Left x
-
 newtype P a = P {
         runP :: ParseState
              -> (ParseState, [MsgEnvelope RlpParseError], Maybe a)
@@ -282,14 +281,13 @@ initAlexInput s = AlexInput
 
 --------------------------------------------------------------------------------
 
-
+deriving instance Lift (RlpProgram RlpcPs)
--- deriving instance Lift (Program RlpcPs)
+deriving instance Lift (Decl RlpcPs)
--- deriving instance Lift (Decl RlpcPs)
+deriving instance Lift (Pat RlpcPs)
--- deriving instance Lift (Pat RlpcPs)
+deriving instance Lift (Lit RlpcPs)
--- deriving instance Lift (Lit RlpcPs)
+deriving instance Lift (RlpExpr RlpcPs)
--- deriving instance Lift (Expr RlpcPs)
+deriving instance Lift (Binding RlpcPs)
--- deriving instance Lift (Binding RlpcPs)
+deriving instance Lift (RlpType RlpcPs)
--- deriving instance Lift (Ty RlpcPs)
+deriving instance Lift (Alt RlpcPs)
--- deriving instance Lift (Alt RlpcPs)
+deriving instance Lift (ConAlt RlpcPs)
--- deriving instance Lift (ConAlt RlpcPs)
 

src/Rlp/Syntax.hs

@@ -1,10 +1,362 @@
+-- recursion-schemes
+{-# LANGUAGE DeriveFunctor, DeriveFoldable, DeriveTraversable
+  , TemplateHaskell, TypeFamilies #-}
+{-# LANGUAGE OverloadedStrings, PatternSynonyms, ViewPatterns #-}
+{-# LANGUAGE TypeFamilies, TypeFamilyDependencies #-}
+{-# LANGUAGE UndecidableInstances, ImpredicativeTypes #-}
 module Rlp.Syntax
-    ( module Rlp.Syntax.Backstage
+    (
-    , module Rlp.Syntax.Types
+    -- * AST
+      RlpProgram(..)
+    , progDecls
+    , Decl(..), Decl', RlpExpr(..), RlpExpr', RlpExprF(..)
+    , Pat(..), Pat'
+    , Alt(..), Where
+    , Assoc(..)
+    , Lit(..), Lit'
+    , RlpType(..), RlpType'
+    , ConAlt(..)
+    , Binding(..), Binding'
+
+    , _PatB, _FunB
+    , _VarP, _LitP, _ConP
+
+    -- * Trees That Grow boilerplate
+    -- ** Extension points
+    , IdP, IdP', XRec, UnXRec(..), MapXRec(..)
+    -- *** Decl
+    , XFunD, XTySigD, XInfixD, XDataD, XXDeclD
+    -- *** RlpExpr
+    , XLetE, XLetrecE, XVarE, XLamE, XCaseE, XIfE, XAppE, XLitE
+    , XParE, XOAppE, XXRlpExprE
+    -- ** Pattern synonyms
+    -- *** Decl
+    , pattern FunD, pattern TySigD, pattern InfixD, pattern DataD
+    , pattern FunD'', pattern TySigD'', pattern InfixD'', pattern DataD''
+    -- *** RlpExpr
+    , pattern LetE, pattern LetrecE, pattern VarE, pattern LamE, pattern CaseE
+    , pattern IfE , pattern AppE, pattern LitE, pattern ParE, pattern OAppE
+    , pattern XRlpExprE
+    -- *** RlpType
+    , pattern FunConT'', pattern FunT'', pattern AppT'', pattern VarT''
+    , pattern ConT''
+    -- *** Pat
+    , pattern VarP'', pattern LitP'', pattern ConP''
+    -- *** Binding
+    , pattern PatB''
     )
     where
---------------------------------------------------------------------------------
+----------------------------------------------------------------------------------
-import Rlp.Syntax.Backstage
+import Data.Text                    (Text)
-import Rlp.Syntax.Types
+import Data.Text                    qualified as T
+import Data.String                  (IsString(..))
+import Data.Functor.Foldable
+import Data.Functor.Foldable.TH     (makeBaseFunctor)
+import Data.Functor.Classes
+import Data.Functor.Identity
+import Data.Kind                    (Type)
+import GHC.Generics
+import Language.Haskell.TH.Syntax   (Lift)
+import Control.Lens
+import Core.Syntax                  hiding (Lit, Type, Binding, Binding')
+import Core                         (HasRHS(..), HasLHS(..))
+----------------------------------------------------------------------------------
+
+data RlpModule p = RlpModule
+    { _rlpmodName       :: Text
+    , _rlpmodProgram    :: RlpProgram p
+    }
+
+-- | dear god.
+type PhaseShow p =
+    ( Show (XRec p (Pat p)), Show (XRec p (RlpExpr p))
+    , Show (XRec p (Lit p)), Show (IdP p)
+    , Show (XRec p (RlpType p))
+    , Show (XRec p (Binding p))
+    )
+
+newtype RlpProgram p = RlpProgram [Decl' p]
+
+progDecls :: Lens' (RlpProgram p) [Decl' p]
+progDecls = lens
+    (\ (RlpProgram ds) -> ds)
+    (const RlpProgram)
+
+deriving instance (PhaseShow p, Show (XRec p (Decl p))) => Show (RlpProgram p)
+
+data RlpType p = FunConT
+               | FunT (RlpType' p) (RlpType' p)
+               | AppT (RlpType' p) (RlpType' p)
+               | VarT (IdP p)
+               | ConT (IdP p)
+
+type RlpType' p = XRec p (RlpType p)
+
+pattern FunConT'' :: (UnXRec p) => RlpType' p
+pattern FunT''    :: (UnXRec p) => RlpType' p -> RlpType' p -> RlpType' p
+pattern AppT''    :: (UnXRec p) => RlpType' p -> RlpType' p -> RlpType' p
+pattern VarT''    :: (UnXRec p) => IdP p -> RlpType' p
+pattern ConT''    :: (UnXRec p) => IdP p -> RlpType' p
+
+pattern FunConT''     <- (unXRec -> FunConT)
+pattern FunT''    s t <- (unXRec -> FunT s t)
+pattern AppT''    s t <- (unXRec -> AppT s t)
+pattern VarT''    n   <- (unXRec -> VarT n)
+pattern ConT''    n   <- (unXRec -> ConT n)
+
+deriving instance (PhaseShow p)
+                  => Show (RlpType p)
+
+data Decl p = FunD'   (XFunD p)    (IdP p) [Pat' p] (RlpExpr' p) (Maybe (Where p))
+            | TySigD' (XTySigD p)  [IdP p] (RlpType' p)
+            | DataD'  (XDataD p)   (IdP p) [IdP p] [ConAlt p]
+            | InfixD' (XInfixD p)  Assoc Int (IdP p)
+            | XDeclD' !(XXDeclD p)
+
+deriving instance
+    ( Show (XFunD p), Show (XTySigD p)
+    , Show (XDataD p), Show (XInfixD p)
+    , Show (XXDeclD p)
+    , PhaseShow p
+    ) 
+    => Show (Decl p)
+
+type family XFunD p
+type family XTySigD p
+type family XDataD p
+type family XInfixD p
+type family XXDeclD p
+
+pattern FunD   :: (XFunD p ~ ())
+               => IdP p -> [Pat' p] -> RlpExpr' p -> Maybe (Where p)
+               -> Decl p
+pattern TySigD :: (XTySigD p ~ ()) => [IdP p] -> RlpType' p -> Decl p
+pattern DataD  :: (XDataD p ~ ()) => IdP p -> [IdP p] -> [ConAlt p] -> Decl p
+pattern InfixD :: (XInfixD p ~ ()) => Assoc -> Int -> IdP p -> Decl p
+pattern XDeclD :: (XXDeclD p ~ ()) => Decl p
+
+pattern FunD n as e wh = FunD' () n as e wh
+pattern TySigD ns t    = TySigD' () ns t
+pattern DataD n as cs  = DataD' () n as cs
+pattern InfixD a p n   = InfixD' () a p n
+pattern XDeclD         = XDeclD' ()
+
+pattern FunD''   :: (UnXRec p)
+                 => IdP p -> [Pat' p] -> RlpExpr' p -> Maybe (Where p)
+                 -> Decl' p
+pattern TySigD'' :: (UnXRec p)
+                 => [IdP p] -> RlpType' p -> Decl' p
+pattern DataD''  :: (UnXRec p)
+                 => IdP p -> [IdP p] -> [ConAlt p] -> Decl' p
+pattern InfixD'' :: (UnXRec p)
+                 => Assoc -> Int -> IdP p -> Decl' p
+
+pattern FunD''   n as e wh <- (unXRec -> FunD' _ n as e wh)
+pattern TySigD'' ns t      <- (unXRec -> TySigD' _ ns t)
+pattern DataD''  n as ds   <- (unXRec -> DataD' _ n as ds)
+pattern InfixD'' a p n     <- (unXRec -> InfixD' _ a p n)
+
+type Decl' p = XRec p (Decl p)
+
+data Assoc = InfixL
+           | InfixR
+           | Infix
+           deriving (Show, Lift)
+
+data ConAlt p = ConAlt (IdP p) [RlpType' p]
+
+deriving instance (Show (IdP p), Show (XRec p (RlpType p))) => Show (ConAlt p)
+
+data RlpExpr p = LetE'      (XLetE p) [Binding' p] (RlpExpr' p)
+               | LetrecE'   (XLetrecE p) [Binding' p] (RlpExpr' p)
+               | VarE'      (XVarE p) (IdP p)
+               | LamE'      (XLamE p) [Pat p] (RlpExpr' p)
+               | CaseE'     (XCaseE p) (RlpExpr' p) [(Alt p, Where p)]
+               | IfE'       (XIfE p) (RlpExpr' p) (RlpExpr' p) (RlpExpr' p)
+               | AppE'      (XAppE p) (RlpExpr' p) (RlpExpr' p)
+               | LitE'      (XLitE p) (Lit p)
+               | ParE'      (XParE p) (RlpExpr' p)
+               | OAppE'     (XOAppE p) (IdP p) (RlpExpr' p) (RlpExpr' p)
+               | XRlpExprE' !(XXRlpExprE p)
+               deriving (Generic)
+
+type family XLetE p
+type family XLetrecE p
+type family XVarE p
+type family XLamE p
+type family XCaseE p
+type family XIfE p
+type family XAppE p
+type family XLitE p
+type family XParE p
+type family XOAppE p
+type family XXRlpExprE p
+
+pattern LetE :: (XLetE p ~ ()) => [Binding' p] -> RlpExpr' p -> RlpExpr p
+pattern LetrecE :: (XLetrecE p ~ ()) => [Binding' p] -> RlpExpr' p -> RlpExpr p
+pattern VarE :: (XVarE p ~ ()) => IdP p -> RlpExpr p
+pattern LamE :: (XLamE p ~ ()) => [Pat p] -> RlpExpr' p -> RlpExpr p
+pattern CaseE :: (XCaseE p ~ ()) => RlpExpr' p -> [(Alt p, Where p)] -> RlpExpr p
+pattern IfE :: (XIfE p ~ ()) => RlpExpr' p -> RlpExpr' p -> RlpExpr' p -> RlpExpr p
+pattern AppE :: (XAppE p ~ ()) => RlpExpr' p -> RlpExpr' p -> RlpExpr p
+pattern LitE :: (XLitE p ~ ()) => Lit p -> RlpExpr p
+pattern ParE :: (XParE p ~ ()) => RlpExpr' p -> RlpExpr p
+pattern OAppE :: (XOAppE p ~ ()) => IdP p -> RlpExpr' p -> RlpExpr' p -> RlpExpr p
+pattern XRlpExprE :: (XXRlpExprE p ~ ()) => RlpExpr p
+
+pattern LetE bs e = LetE' () bs e
+pattern LetrecE bs e = LetrecE' () bs e
+pattern VarE n = VarE' () n
+pattern LamE as e = LamE' () as e
+pattern CaseE e as = CaseE' () e as
+pattern IfE c a b = IfE' () c a b
+pattern AppE f x = AppE' () f x
+pattern LitE l = LitE' () l
+pattern ParE e = ParE' () e
+pattern OAppE n a b = OAppE' () n a b
+pattern XRlpExprE = XRlpExprE' ()
+
+deriving instance
+    ( Show (XLetE p), Show (XLetrecE p), Show (XVarE p)
+    , Show (XLamE p), Show (XCaseE p), Show (XIfE p)
+    , Show (XAppE p), Show (XLitE p), Show (XParE p)
+    , Show (XOAppE p), Show (XXRlpExprE p)
+    , PhaseShow p
+    ) => Show (RlpExpr p)
+
+type RlpExpr' p = XRec p (RlpExpr p)
+
+class UnXRec p where
+    unXRec :: XRec p a -> a
+
+class WrapXRec p where
+    wrapXRec :: a -> XRec p a
+
+class MapXRec p where
+    mapXRec :: (a -> b) -> XRec p a -> XRec p b
+
+-- old definition:
+-- type family XRec p (f :: Type -> Type) = (r :: Type) | r -> p f
+type family XRec p a = (r :: Type) | r -> p a
+
+type family IdP p
+
+type IdP' p = XRec p (IdP p)
+
+type Where p = [Binding p]
+
+-- do we want guards?
+data Alt p = AltA (Pat' p) (RlpExpr' p)
+
+deriving instance (PhaseShow p) => Show (Alt p)
+
+data Binding p = PatB (Pat' p) (RlpExpr' p)
+               | FunB (IdP p) [Pat' p] (RlpExpr' p)
+
+type Binding' p = XRec p (Binding p)
+
+pattern PatB'' :: (UnXRec p) => Pat' p -> RlpExpr' p -> Binding' p
+pattern PatB'' p e <- (unXRec -> PatB p e)
+
+deriving instance (Show (XRec p (Pat p)), Show (XRec p (RlpExpr p)), Show (IdP p)
+                  ) => Show (Binding p)
+
+data Pat p = VarP (IdP p)
+           | LitP (Lit' p)
+           | ConP (IdP p) [Pat' p]
+
+pattern VarP'' :: (UnXRec p) => IdP p -> Pat' p
+pattern LitP'' :: (UnXRec p) => Lit' p -> Pat' p
+pattern ConP'' :: (UnXRec p) => IdP p -> [Pat' p] -> Pat' p
+
+pattern VarP'' n    <- (unXRec -> VarP n)
+pattern LitP'' l    <- (unXRec -> LitP l)
+pattern ConP'' c as <- (unXRec -> ConP c as)
+
+deriving instance (PhaseShow p) => Show (Pat p)
+
+type Pat' p = XRec p (Pat p)
+
+data Lit p = IntL Int
+           | CharL Char
+           | ListL [RlpExpr' p]
+
+deriving instance (PhaseShow p) => Show (Lit p)
+
+type Lit' p = XRec p (Lit p)
+
+-- instance HasLHS Alt Alt Pat Pat where
+--     _lhs = lens
+--         (\ (AltA p _) -> p)
+--         (\ (AltA _ e) p' -> AltA p' e)
+
+-- instance HasRHS Alt Alt RlpExpr RlpExpr where
+--     _rhs = lens
+--         (\ (AltA _ e) -> e)
+--         (\ (AltA p _) e' -> AltA p e')
+
+-- makeBaseFunctor ''RlpExpr
+
+-- showsTernaryWith :: (Int -> x -> ShowS)
+--                  -> (Int -> y -> ShowS)
+--                  -> (Int -> z -> ShowS)
+--                  -> String -> Int
+--                  -> x -> y -> z
+--                  -> ShowS
+-- showsTernaryWith sa sb sc name p a b c = showParen (p > 10)
+--     $ showString name
+--     . showChar ' ' . sa 11 a 
+--     . showChar ' ' . sb 11 b
+--     . showChar ' ' . sc 11 c
+
 --------------------------------------------------------------------------------
 
+makeLenses ''RlpModule
+makePrisms ''Pat
+makePrisms ''Binding
+
+--------------------------------------------------------------------------------
+
+data RlpExprF p a = LetE'F  (XLetE p) [Binding' p] a
+                  | LetrecE'F  (XLetrecE p) [Binding' p] a
+                  | VarE'F  (XVarE p) (IdP p)
+                  | LamE'F  (XLamE p) [Pat p] a
+                  | CaseE'F (XCaseE p) a [(Alt p, Where p)]
+                  | IfE'F   (XIfE p) a a a
+                  | AppE'F  (XAppE p) a a
+                  | LitE'F  (XLitE p) (Lit p)
+                  | ParE'F  (XParE p) a
+                  | OAppE'F (XOAppE p) (IdP p) a a
+                  | XRlpExprE'F !(XXRlpExprE p)
+                  deriving (Functor, Foldable, Traversable, Generic)
+
+type instance Base (RlpExpr p) = RlpExprF p
+
+instance (UnXRec p) => Recursive (RlpExpr p) where
+    project = \case
+        LetE' xx bs e   -> LetE'F xx bs (unXRec e)
+        LetrecE' xx bs e   -> LetrecE'F xx bs (unXRec e)
+        VarE' xx n      -> VarE'F xx n
+        LamE' xx ps e   -> LamE'F xx ps (unXRec e)
+        CaseE' xx e as  -> CaseE'F xx (unXRec e) as
+        IfE' xx a b c   -> IfE'F xx (unXRec a) (unXRec b) (unXRec c)
+        AppE' xx f x    -> AppE'F xx (unXRec f) (unXRec x)
+        LitE' xx l      -> LitE'F xx l
+        ParE' xx e      -> ParE'F xx (unXRec e)
+        OAppE' xx f a b -> OAppE'F xx f (unXRec a) (unXRec b)
+        XRlpExprE' xx   -> XRlpExprE'F xx
+
+instance (WrapXRec p) => Corecursive (RlpExpr p) where
+    embed = \case
+        LetE'F xx bs e   -> LetE' xx bs (wrapXRec e)
+        LetrecE'F xx bs e   -> LetrecE' xx bs (wrapXRec e)
+        VarE'F xx n      -> VarE' xx n
+        LamE'F xx ps e   -> LamE' xx ps (wrapXRec e)
+        CaseE'F xx e as  -> CaseE' xx (wrapXRec e) as
+        IfE'F xx a b c   -> IfE' xx (wrapXRec a) (wrapXRec b) (wrapXRec c)
+        AppE'F xx f x    -> AppE' xx (wrapXRec f) (wrapXRec x)
+        LitE'F xx l      -> LitE' xx l
+        ParE'F xx e      -> ParE' xx (wrapXRec e)
+        OAppE'F xx f a b -> OAppE' xx f (wrapXRec a) (wrapXRec b)
+        XRlpExprE'F xx   -> XRlpExprE' xx
+

src/Rlp/Syntax/Backstage.hs

@@ -1,35 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-{-# LANGUAGE UndecidableInstances #-}
-module Rlp.Syntax.Backstage
-    ( strip
-    )
-    where
---------------------------------------------------------------------------------
-import Data.Fix                     hiding (cata)
-import Data.Functor.Classes
-import Data.Functor.Foldable
-import Rlp.Syntax.Types
-import Text.Show.Deriving
-import Language.Haskell.TH.Syntax   (Lift)
---------------------------------------------------------------------------------
-
--- oprhan instances because TH
-
-instance (Show (NameP p)) => Show1 (Alt p) where
-    liftShowsPrec = $(makeLiftShowsPrec ''Alt)
-
-instance (Show (NameP p)) => Show1 (Binding p) where
-    liftShowsPrec = $(makeLiftShowsPrec ''Binding)
-
-instance (Show (NameP p)) => Show1 (ExprF p) where
-    liftShowsPrec = $(makeLiftShowsPrec ''ExprF)
-
-deriving instance (Lift (NameP p), Lift a) => Lift (Expr' p a)
-deriving instance (Lift (NameP p), Lift a) => Lift (Decl p a)
-deriving instance (Show (NameP p), Show a) => Show (Decl p a)
-
-deriving instance (Show (NameP p), Show a) => Show (Program p a)
-
-strip :: Functor f => Cofree f a -> Fix f
-strip (_ :< as) = Fix $ strip <$> as
-

src/Rlp/Syntax/Types.hs

@@ -1,143 +0,0 @@
--- recursion-schemes
-{-# LANGUAGE DeriveTraversable, TemplateHaskell, TypeFamilies #-}
-{-# LANGUAGE OverloadedStrings, PatternSynonyms, ViewPatterns #-}
-{-# LANGUAGE UndecidableInstances, ImpredicativeTypes #-}
-module Rlp.Syntax.Types
-    (
-      NameP
-    , SimpleP
-    , Assoc(..)
-    , ConAlt(..)
-    , Alt(..), Alt'
-    , Ty(..)
-    , Binding(..), Binding'
-    , Expr', ExprF(..)
-    , Rec(..)
-    , Lit(..)
-    , Pat(..)
-    , Decl(..)
-    , Program(..)
-    , Where
-
-    -- * Re-exports
-    , Cofree(..)
-    , Trans.Cofree.CofreeF
-    , SrcSpan(..)
-    )
-    where
-----------------------------------------------------------------------------------
-import Data.Text                    (Text)
-import Data.Text                    qualified as T
-import Data.String                  (IsString(..))
-import Data.Functor.Classes
-import Data.Functor.Identity
-import Data.Functor.Compose
-import Data.Fix
-import Data.Kind                    (Type)
-import GHC.Generics
-import Language.Haskell.TH.Syntax   (Lift)
-import Control.Lens                 hiding ((:<))
-
-import Control.Comonad.Trans.Cofree qualified as Trans.Cofree
-import Control.Comonad.Cofree
-import Data.Functor.Foldable
-import Data.Functor.Foldable.TH     (makeBaseFunctor)
-
-import Compiler.Types               (SrcSpan(..), Located(..))
-import Core.Syntax                  qualified as Core
-import Core                         (Rec(..), HasRHS(..), HasLHS(..))
-----------------------------------------------------------------------------------
-
-data SimpleP
-
-type instance NameP SimpleP = String
-
-type family NameP p
-
-data ExprF p a = LetEF   Rec [Binding p a] a
-               | VarEF   (NameP p)
-               | LamEF   [Pat p] a
-               | CaseEF  a [Alt p a]
-               | IfEF    a a a
-               | AppEF   a a
-               | LitEF   (Lit p)
-               | ParEF   a
-               | InfixEF (NameP p) a a
-               deriving (Functor, Foldable, Traversable)
-
-data ConAlt p = ConAlt (NameP p) [Ty p]
-
-deriving instance (Lift (NameP p)) => Lift (ConAlt p)
-deriving instance (Show (NameP p)) => Show (ConAlt p)
-
-data Ty p = ConT (NameP p)
-          | VarT (NameP p)
-          | FunT (Ty p) (Ty p)
-          | AppT (Ty p) (Ty p)
-
-deriving instance (Show (NameP p)) => Show (Ty p)
-deriving instance (Lift (NameP p)) => Lift (Ty p)
-
-data Pat p = VarP (NameP p)
-           | LitP (Lit p)
-           | ConP (NameP p) [Pat p]
-
-deriving instance (Lift (NameP p)) => Lift (Pat p)
-deriving instance (Show (NameP p)) => Show (Pat p)
-
-data Lit p = IntL Int
-    deriving Show
-
-deriving instance (Lift (NameP p)) => Lift (Lit p)
-
-data Assoc = InfixL | InfixR | Infix
-    deriving (Lift, Show)
-
-deriving instance (Show (NameP p), Show a) => Show (ExprF p a)
-deriving instance (Lift (NameP p), Lift a) => Lift (ExprF p a)
-
-data Binding p a = PatB (Pat p) (ExprF p a)
-    deriving (Functor, Foldable, Traversable)
-
-deriving instance (Lift (NameP p), Lift a) => Lift (Binding p a)
-deriving instance (Show (NameP p), Show a) => Show (Binding p a)
-
-type Binding' p a = Binding p (Cofree (ExprF p) a)
-
-type Where p a = [Binding p a]
-
-data Alt p a = AltA (Pat p) (ExprF p a) (Maybe (Where p a))
-    deriving (Functor, Foldable, Traversable)
-
-deriving instance (Show (NameP p), Show a) => Show (Alt p a)
-deriving instance (Lift (NameP p), Lift a) => Lift (Alt p a)
-
-type Expr p = Fix (ExprF p)
-
-type Alt' p a = Alt p (Cofree (ExprF p) a)
-
---------------------------------------------------------------------------------
-
-data Program p a = Program
-    { _programDecls :: [Decl p a]
-    }
-
-data Decl p a = FunD   (NameP p) [Pat p] (Expr' p a) (Maybe (Where p a))
-              | TySigD [NameP p] (Ty p)
-              | DataD  (NameP p) [NameP p] [ConAlt p]
-              | InfixD Assoc Int (NameP p)
-
-type Decl' p a = Decl p (Cofree (ExprF p) a)
-
-type Expr' p = Cofree (ExprF p)
-
-makeLenses ''Program
-
-loccof :: Iso' (Cofree f SrcSpan) (Located (f (Cofree f SrcSpan)))
-loccof = iso sa bt where
-    sa :: Cofree f SrcSpan -> Located (f (Cofree f SrcSpan))
-    sa (ss :< as) = Located ss as
-
-    bt :: Located (f (Cofree f SrcSpan)) -> Cofree f SrcSpan
-    bt (Located ss as) = ss :< as
-

src/Rlp/TH.hs

@@ -17,12 +17,10 @@ import Rlp.Parse
 --------------------------------------------------------------------------------
 
 rlpProg :: QuasiQuoter
-rlpProg = undefined
+rlpProg = mkqq parseRlpProgR
--- rlpProg = mkqq parseRlpProgR
 
 rlpExpr :: QuasiQuoter
-rlpExpr = undefined
+rlpExpr = mkqq parseRlpExprR
--- rlpExpr = mkqq parseRlpExprR
 
 mkq :: (Lift a) => (Text -> RLPCIO a) -> String -> Q Exp
 mkq parse = evalAndParse >=> lift where

src/Rlp2Core.hs

@@ -41,12 +41,6 @@ import Rlp.Syntax                       as Rlp
 import Rlp.Parse.Types                  (RlpcPs, PsName)
 --------------------------------------------------------------------------------
 
-desugarRlpProgR = undefined
-desugarRlpProg = undefined
-desugarRlpExpr = undefined
-
-{--
-
 type Tree a = Either Name (Name, Branch a)
 
 -- | Rose tree branch representing "nested" "patterns" in the Core language. That
@@ -240,5 +234,3 @@ typeToCore (VarT'' x)   = TyVar (dsNameToName x)
 dsNameToName :: IdP RlpcPs -> Name
 dsNameToName = id
 
--}
-

tst/Compiler/TypesSpec.hs

@@ -1,67 +0,0 @@
-{-# LANGUAGE ParallelListComp #-}
-module Compiler.TypesSpec
-    ( spec
-    )
-    where
---------------------------------------------------------------------------------
-import Control.Lens.Combinators
-import Data.Function            ((&))
-
-import Test.QuickCheck
-import Test.Hspec
-
-import Compiler.Types           (SrcSpan(..), srcSpanAbs, srcSpanLen)
---------------------------------------------------------------------------------
-
-spec :: Spec
-spec = do
-    describe "SrcSpan" $ do
-        -- it "associates under closure"
-        --     prop_SrcSpan_mul_associative
-        it "commutes under closure"
-            prop_SrcSpan_mul_commutative
-        it "equals itself when squared"
-            prop_SrcSpan_mul_square_eq
-
-prop_SrcSpan_mul_associative :: Property
-prop_SrcSpan_mul_associative = property $ \a b c ->
-    -- very crudely approximate when overflow will occur; bail we think it
-    -- will
-    (([a,b,c] :: [SrcSpan]) & allOf (each . (srcSpanAbs <> srcSpanLen))
-                                    (< (maxBound @Int `div` 3)))
-    ==> (a <> b) <> c === a <> (b <> c :: SrcSpan)
-
-prop_SrcSpan_mul_commutative :: Property
-prop_SrcSpan_mul_commutative = property $ \a b ->
-    a <> b === (b <> a :: SrcSpan)
-
-prop_SrcSpan_mul_square_eq :: Property
-prop_SrcSpan_mul_square_eq = property $ \a ->
-    a <> a === (a :: SrcSpan)
-
-instance Arbitrary SrcSpan where
-    arbitrary = do
-        l <- chooseInt (1, maxBound)
-        c <- chooseInt (1, maxBound)
-        a <- chooseInt (0, maxBound)
-            `suchThat` (\n -> n >= pred l + pred c)
-        s <- chooseInt (0, maxBound)
-        pure $ SrcSpan l c a s
-
-    shrink (SrcSpan l c a s) =
-        [ SrcSpan l' c' a' s'
-        | (l',c',a',s') <- shrinkParts
-        , l' >= 1
-        , c' >= 1
-        , a' >= pred l' + pred c'
-        ]
-      where
-        -- shfl as = unsafePerformIO (generate $ shuffle as)
-        shrinkParts = 
-            [ (l',c',a',s')
-            | l' <- shrinkIntegral l
-            | c' <- shrinkIntegral c
-            | a' <- shrinkIntegral a
-            | s' <- shrinkIntegral s
-            ]
-