love when writing d instead of d-1 causes hours of stress

Makefile_happysrcs

@@ -1,11 +1,10 @@
-GHC_VERSION = $(shell ghc --numeric-version)
 HAPPY = happy
 HAPPY_OPTS = -a -g -c -i/tmp/t.info
 ALEX = alex
 ALEX_OPTS = -g
 
 SRC = src
-CABAL_BUILD = $(shell ./find-build.cl)
+CABAL_BUILD = dist-newstyle/build/x86_64-osx/ghc-9.6.2/rlp-0.1.0.0/build
 
 all: parsers lexers
 

README.md

@@ -26,14 +26,12 @@ $ cabal test --test-show-details=direct
 #### TLDR
 
 ```sh
-# Compile and evaluate examples/rlp/QuickSort.rl
-$ rlpc examples/QuickSort.rl
+# Compile and evaluate examples/factorial.cr, with evaluation info dumped to stderr
+$ rlpc -ddump-eval examples/factorial.cr
 # Compile and evaluate t.cr, with evaluation info dumped to t.log
 $ rlpc -ddump-eval -l t.log t.cr
 # Compile and evaluate t.rl, dumping the desugared Core
 $ rlpc -ddump-desugared t.rl
-# Compile and evaluate t.rl with all compiler messages enabled
-$ rlpc -dALL t.rl
 ```
 
 #### Options
@@ -128,7 +126,7 @@ parsing remains.
     - [x] Garbage Collection
 - [ ] Stable documentation for the evaluation model
 
-### ~~February Release Plan~~
+### February Release Plan
 - [x] Beta rl' to Core
 - [x] UX improvements
     - [x] Actual compiler errors -- no more unexceptional `error` calls
@@ -136,14 +134,12 @@ parsing remains.
     - [x] Annotate the AST with token positions for errors (NOTE: As of Feb. 1,
       this has been done, but the locational info is not yet used in error messages)
 - [x] Compiler architecture diagram
-- [x] More examples
+- [ ] More examples
 
 ### March Release Plan
 - [ ] Tests
     - [ ] rl' parser
     - [ ] rl' lexer
-- [ ] Ditch TTG in favour of a simpler AST focusing on extendability via Fix, Free, 
-  Cofree, etc. rather than boilerplate-heavy type families
 
 ### Indefinite Release Plan
 
@@ -154,6 +150,8 @@ than the other release plans.
     - [ ] Complete all TODOs
     - [ ] Replace mtl with effectful
 - [ ] rl' type-checker
+- [ ] Ditch TTG in favour of a simpler AST focusing on extendability via Fix, Free, 
+  Cofree, etc. rather than boilerplate-heavy type families
 - [ ] Stable rl' to Core
 - [ ] Core polish
     - [ ] Better, stable parser
@@ -162,4 +160,3 @@ than the other release plans.
     - [ ] Less hacky pragmas
 - [ ] Choose a target. LLVM, JS, C, and WASM are currently top contenders
 - [ ] https://proglangdesign.net/wiki/challenges
-

app/CoreDriver.hs

@@ -6,7 +6,7 @@ module CoreDriver
 import Compiler.RLPC
 import Control.Monad
 import Data.Text                    qualified as T
-import Control.Lens.Combinators
+import Lens.Micro.Platform
 
 import Core.Lex
 import Core.Parse

app/Main.hs

@@ -19,7 +19,7 @@ import System.Exit              (exitSuccess)
 import Core
 import TI
 import GM
-import Control.Lens.Combinators hiding (argument)
+import Lens.Micro.Platform
 
 import CoreDriver               qualified
 import RlpDriver                qualified

cabal.project.local

@@ -0,0 +1,8 @@
+profiling: True
+ignore-project: False
+library-profiling: True
+executable-profiling: True
+profiling-detail: all-functions
+tests: True
+benchmarks: True
+

cabal.project.local~

@@ -0,0 +1,5 @@
+ignore-project: False
+library-profiling: True
+executable-profiling: True
+tests: True
+benchmarks: True

doc/src/commentary/gm.rst

@@ -63,13 +63,52 @@ an assembly target. The goal of our new G-Machine is to compile a *linear
 sequence of instructions* which, **when executed**, build up a graph
 representing the code.
 
-*************
-The G-Machine
-*************
+**************************
+Trees and Vines, in Theory
+**************************
+
+Rather than instantiating an expression at runtime -- traversing the AST and
+building a graph -- we want to compile all expressions at compile-time,
+generating a linear sequence of instructions which may be executed to build the
+graph.
+
+**************************
+Evaluation: Slurping Vines
+**************************
+
+WIP.
+
+Laziness
+--------
+
+WIP.
+
+* Instead of :code:`Slide (n+1); Unwind`, do :code:`Update n; Pop n; Unwind`
+
+****************************
+Compilation: Squashing Trees
+****************************
+
+WIP.
+
+Notice that we do not keep a (local) environment at run-time. The environment
+only exists at compile-time to map local names to stack indices. When compiling
+a supercombinator, the arguments are enumerated from zero (the top of the
+stack), and passed to :code:`compileR` as an environment.
 
 .. literalinclude:: /../../src/GM.hs
    :dedent:
-   :start-after: -- >> [ref/Instr]
-   :end-before: -- << [ref/Instr]
+   :start-after: -- >> [ref/compileSc]
+   :end-before: -- << [ref/compileSc]
+   :caption: src/GM.hs
+
+Of course, variables being indexed relative to the top of the stack means that
+they will become inaccurate the moment we push or pop the stack a single time.
+The way around this is quite simple: simply offset the stack when w
+
+.. literalinclude:: /../../src/GM.hs
+   :dedent:
+   :start-after: -- >> [ref/compileC]
+   :end-before: -- << [ref/compileC]
    :caption: src/GM.hs
 

doc/src/commentary/layout-lexing.rst

@@ -62,6 +62,159 @@ braces and semicolons. In developing our *layout* rules, we will follow in the
 pattern of translating the whitespace-sensitive source language to an explicitly
 sectioned language.
 
+But What About Haskell?
+***********************
+
+Parsing Haskell -- and thus rl' -- is only slightly more complex than Python,
+but the design is certainly more sensitive. 
+
+.. code-block:: haskell
+
+   -- line folds
+   something = this is a
+       single expression
+
+   -- an extremely common style found in haskell
+   data Some = Data
+       { is    :: Presented
+       , in    :: This
+       , silly :: Style
+       }
+
+   -- another style oddity
+   -- note that this is not a single
+   -- continued line! `look at`,
+   -- `this odd`, and `alignment` are all
+   -- discrete items!
+   anotherThing = do look at
+                     this odd
+                     alignment
+
+But enough fear, lets actually think about implementation. Firstly, some
+formality: what do we mean when we say layout? We will define layout as the
+rules we apply to an implicitly-sectioned language in order to yield one that is
+explicitly-sectioned. We will also define indentation of a lexeme as the column
+number of its first character.
+
+Thankfully for us, our entry point is quite clear; layouts only appear after a
+select few keywords, (with a minor exception; TODO: elaborate) being :code:`let`
+(followed by supercombinators), :code:`where` (followed by supercombinators),
+:code:`do` (followed by expressions), and :code:`of` (followed by alternatives)
+(TODO: all of these terms need linked glossary entries). In order to manage the
+cascade of layout contexts, our lexer will record a stack for which each element
+is either :math:`\varnothing`, denoting an explicit layout written with braces
+and semicolons, or a :math:`\langle n \rangle`, denoting an implicitly laid-out
+layout where the start of each item belonging to the layout is indented
+:math:`n` columns.
+
+.. code-block:: haskell
+
+    -- layout stack: []
+    module M where -- layout stack: [∅]
+
+    f x = let -- layout keyword; remember indentation of next token
+              y = w * w -- layout stack: [∅, <10>]
+              w = x + x
+              -- layout ends here
+          in do -- layout keyword; next token is a brace!
+              { -- layout stack: [∅]
+                  print y;
+                  print x;
+              }
+
+Finally, we also need the concept of "virtual" brace tokens, which as far as
+we're concerned at this moment are exactly like normal brace tokens, except
+implicitly inserted by the compiler. With the presented ideas in mind, we may
+begin to introduce a small set of informal rules describing the lexer's handling
+of layouts, the first being:
+
+1. If a layout keyword is followed by the token '{', push :math:`\varnothing`
+   onto the layout context stack. Otherwise, push :math:`\langle n \rangle` onto
+   the layout context stack where :math:`n` is the indentation of the token
+   following the layout keyword. Additionally, the lexer is to insert a virtual
+   opening brace after the token representing the layout keyword.
+
+Consider the following observations from that previous code sample:
+
+* Function definitions should belong to a layout, each of which may start at
+  column 1.
+
+* A layout can enclose multiple bodies, as seen in the :code:`let`-bindings and
+  the :code:`do`-expression.
+
+* Semicolons should *terminate* items, rather than *separate* them.
+
+Our current focus is the semicolons. In an implicit layout, items are on
+separate lines each aligned with the previous. A naïve implementation would be
+to insert the semicolon token when the EOL is reached, but this proves unideal
+when you consider the alignment requirement. In our implementation, our lexer
+will wait until the first token on a new line is reached, then compare
+indentation and insert a semicolon if appropriate. This comparison -- the
+nondescript measurement of "more, less, or equal indentation" rather than a
+numeric value -- is referred to as *offside* by myself internally and the
+Haskell report describing layouts. We informally formalise this rule as follows:
+
+2. When the first token on a line is preceeded only by whitespace, if the
+   token's first grapheme resides on a column number :math:`m` equal to the
+   indentation level of the enclosing context -- i.e. the :math:`\langle n
+   \rangle` on top of the layout stack. Should no such context exist on the
+   stack, assume :math:`m > n`.
+
+We have an idea of how to begin layouts, delimit the enclosed items, and last
+we'll need to end layouts. This is where the distinction between virtual and
+non-virtual brace tokens comes into play. The lexer needs only partial concern
+towards closing layouts; the complete responsibility is shared with the parser.
+This will be elaborated on in the next section. For now, we will be content with
+naïvely inserting a virtual closing brace when a token is indented right of the
+layout.
+
+3. Under the same conditions as rule 2., when :math:`m < n` the lexer shall
+   insert a virtual closing brace and pop the layout stack.
+
+This rule covers some cases including the top-level, however, consider
+tokenising the :code:`in` in a :code:`let`-expression. If our lexical analysis
+framework only allows for lexing a single token at a time, we cannot return both
+a virtual right-brace and a :code:`in`. Under this model, the lexer may simply
+pop the layout stack and return the :code:`in` token. As we'll see in the next
+section, as long as the lexer keeps track of its own context (i.e. the stack),
+the parser will cope just fine without the virtual end-brace.
+
+Parsing Lonely Braces
+*********************
+
+When viewed in the abstract, parsing and tokenising are near-identical tasks yet
+the two are very often decomposed into discrete systems with very different
+implementations. Lexers operate on streams of text and tokens, while parsers
+are typically far less linear, using a parse stack or recursing top-down. A
+big reason for this separation is state management: the parser aims to be as
+context-free as possible, while the lexer tends to burden the necessary
+statefulness. Still, the nature of a stream-oriented lexer makes backtracking
+difficult and quite inelegant.
+
+However, simply declaring a parse error to be not an error at all
+counterintuitively proves to be an elegant solution our layout problem which
+minimises backtracking and state in both the lexer and the parser. Consider the
+following definitions found in rlp's BNF:
+
+.. productionlist:: rlp
+   VOpen   : `vopen`
+   VClose  : `vclose` | `error`
+
+A parse error is recovered and treated as a closing brace. Another point of note
+in the BNF is the difference between virtual and non-virtual braces (TODO: i
+don't like that the BNF is formatted without newlines :/):
+
+.. productionlist:: rlp
+   LetExpr : `let` VOpen Bindings VClose `in` Expr | `let` `{` Bindings `}` `in` Expr
+
+This ensures that non-virtual braces are closed explicitly.
+
+This set of rules is adequete enough to satisfy our basic concerns about line
+continations and layout lists. For a more pedantic description of the layout
+system, see `chapter 10
+<https://www.haskell.org/onlinereport/haskell2010/haskellch10.html>`_ of the
+2010 Haskell Report, which I heavily referenced here.
+
 References
 ----------
 

examples/Core/factorial.cr

@@ -1,9 +1,7 @@
-fac : Int# -> Int#
 fac n = case (==#) n 0 of
     { <1> -> 1
     ; <0> -> *# n (fac (-# n 1))
     };
 
-main : IO ()
 main = fac 3;
 

examples/rlp/Help.rl

@@ -0,0 +1,10 @@
+id x = x
+
+thing = Identity 3
+
+data Identity a = Identity a
+
+main = case thing of
+    Identity x -> let y = x
+                  in y
+

examples/rlp/MapList.rl

@@ -0,0 +1,13 @@
+data List a = Nil | Cons a (List a)
+
+map :: (a -> b) -> List a -> List b
+map f l = case l of
+    Nil -> Nil
+    Cons a as -> Cons (f a) (map f as)
+
+list = Cons 1 (Cons 2 (Cons 3 Nil))
+
+lam x = *# x x
+
+main = print# (map lam list)
+

examples/rlp/QuickSort.rl

@@ -23,9 +23,18 @@ qsort l = case l of
             greater = filter (<# a) as
         in append (append (qsort lesser) (Cons a Nil)) (qsort greater)
 
-list :: List Int#
 list = Cons 9 (Cons 2 (Cons 3 (Cons 2
             (Cons 5 (Cons 2 (Cons 12 (Cons 89 Nil)))))))
 
-main = print# (qsort list)
+list2 = Cons 2 (Cons 3 Nil)
+
+lt :: Int# -> Int# -> Bool
+lt a = (>=# a)
+
+id x = x
+
+main = case list of
+    Nil -> Nil
+    Cons a as -> let lesser = filter (lt a) as
+                 in lesser
 

find-build.cl

@@ -1,8 +0,0 @@
-#!/usr/bin/env sbcl --script
-
-(let* ((paths (directory "dist-newstyle/build/*/*/rlp-*/build/"))
-       (n (length paths)))
-  (cond ((< 1 n) (error ">1 build directories found. run `cabal clean`."))
-        ((< n 1) (error "no build directories found. this shouldn't happen lol"))
-        (t       (format t "~A" (car paths)))))
-

rlp.cabal

@@ -32,8 +32,6 @@ library
                     , Core.HindleyMilner
                     , Control.Monad.Errorful
                     , Rlp.Syntax
-                    , Rlp.Syntax.Backstage
-                    , Rlp.Syntax.Types
                     -- , Rlp.Parse.Decls
                     , Rlp.Parse
                     , Rlp.Parse.Associate
@@ -44,14 +42,10 @@ library
                     , Data.Heap
                     , Data.Pretty
                     , Core.Parse
-                    , Core.Parse.Types
                     , Core.Lex
                     , Core2Core
                     , Rlp2Core
                     , Control.Monad.Utils
-                    , Misc
-                    , Misc.Lift1
-                    , Core.SystemF
 
     build-tool-depends: happy:happy, alex:alex
 
@@ -66,21 +60,28 @@ library
                     , data-default-class >= 0.1.2 && < 0.2
                     , hashable >= 1.4.3 && < 1.5
                     , mtl >= 2.3.1 && < 2.4
-                    , text >= 2.0.2 && < 2.2
+                    , text >= 2.0.2 && < 2.1
+                    , megaparsec >= 9.6.1 && < 9.7
+                    , microlens >= 0.4.13 && < 0.5
+                    , microlens-mtl >= 0.2.0 && < 0.3
+                    , microlens-platform >= 0.4.3 && < 0.5
+                    , microlens-th >= 0.4.3 && < 0.5
                     , unordered-containers >= 0.2.20 && < 0.3
                     , recursion-schemes >= 5.2.2 && < 5.3
                     , data-fix >= 0.3.2 && < 0.4
                     , utf8-string >= 1.0.2 && < 1.1
-                    , extra >= 1.7.0 && <2
-                    , semigroupoids >=6.0 && <6.1
-                    , comonad >=5.0.0 && <6
-                    , lens >=5.2.3 && <6.0
-                    , text-ansi >=0.2.0 && <0.4
+                    , extra >= 1.7.0 && < 2
+                    , semigroupoids
+                    , comonad
+                    , lens
+                    , text-ansi
+                    , microlens-pro ^>=0.2.0
                     , effectful-core ^>=2.3.0.0
                     , deriving-compat ^>=0.6.0
                     , these >=0.2 && <2.0
-                    , free >=5.2
-                    , bifunctors >=5.2
+
+    ghc-options:
+        -fprof-auto
 
     hs-source-dirs:   src
     default-language: GHC2021
@@ -94,7 +95,6 @@ library
         DerivingVia
         StandaloneDeriving
         DerivingStrategies
-        BlockArguments
 
 executable rlpc
     import:           warnings
@@ -105,10 +105,10 @@ executable rlpc
     build-depends: base >=4.17.0.0 && <4.20.0.0
                  , rlp
                  , optparse-applicative >= 0.18.1 && < 0.19
+                 , microlens-platform
                  , mtl >= 2.3.1 && < 2.4
                  , unordered-containers >= 0.2.20 && < 0.3
-                 , lens >=5.2.3 && <6.0
-                 , text >= 2.0.2 && < 2.2
+                 , text >= 2.0.2 && < 2.1
 
     hs-source-dirs:   app
     default-language: GHC2021
@@ -125,10 +125,8 @@ 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/JustRun.hs

@@ -11,55 +11,38 @@ module Compiler.JustRun
     ( justLexCore
     , justParseCore
     , justTypeCheckCore
-    , justHdbg
-    , makeItPretty, makeItPretty'
     )
     where
 ----------------------------------------------------------------------------------
 import Core.Lex
 import Core.Parse
 import Core.HindleyMilner
-import Core.Syntax
+import Core.Syntax                      (Program')
 import Compiler.RLPC
 import Control.Arrow                    ((>>>))
-import Control.Monad                    ((>=>), void)
+import Control.Monad                    ((>=>))
 import Control.Comonad
 import Control.Lens
 import Data.Text                        qualified as T
 import Data.Function                    ((&))
-import System.IO
 import GM
-import Rlp.Parse
-import Rlp2Core
-import Data.Pretty
 ----------------------------------------------------------------------------------
 
-justHdbg :: String -> IO GmState
-justHdbg s = do
-    p <- evalRLPCIO def (parseRlpProgR >=> desugarRlpProgR $ T.pack s)
-    withFile "/tmp/t.log" WriteMode $ hdbgProg p
-
 justLexCore :: String -> Either [MsgEnvelope RlpcError] [CoreToken]
 justLexCore s = lexCoreR (T.pack s)
               & mapped . each %~ extract
               & rlpcToEither
 
-justParseCore :: String -> Either [MsgEnvelope RlpcError] (Program Var)
+justParseCore :: String -> Either [MsgEnvelope RlpcError] Program'
 justParseCore s = parse (T.pack s)
                 & rlpcToEither
-    where parse = lexCoreR @Identity >=> parseCoreProgR
+    where parse = lexCoreR >=> parseCoreProgR
 
 justTypeCheckCore :: String -> Either [MsgEnvelope RlpcError] Program'
 justTypeCheckCore s = typechk (T.pack s)
                     & rlpcToEither
     where typechk = lexCoreR >=> parseCoreProgR >=> checkCoreProgR
 
-makeItPretty :: (Pretty a) => Either e a -> Either e Doc
-makeItPretty = fmap pretty
-
-makeItPretty' :: (Pretty (WithTerseBinds a)) => Either e a -> Either e Doc
-makeItPretty' = fmap (pretty . WithTerseBinds)
-
 rlpcToEither :: RLPC a -> Either [MsgEnvelope RlpcError] a
 rlpcToEither r = case evalRLPC def r of
     (Just a,   _) -> Right a

src/Compiler/RLPC.hs

@@ -27,7 +27,7 @@ module Compiler.RLPC
     -- ** Lenses
     , rlpcLogFile, rlpcDFlags, rlpcEvaluator, rlpcInputFiles, rlpcLanguage
     -- * Misc. MTL-style functions
-    , liftErrorful, liftMaybe, hoistRlpcT
+    , liftErrorful, hoistRlpcT
     -- * Misc. Rlpc Monad -related types
     , RLPCOptions(RLPCOptions), IsRlpcError(..), RlpcError(..)
     , MsgEnvelope(..), Severity(..)
@@ -64,8 +64,8 @@ import Data.Text.IO             qualified as T
 import System.IO
 import Text.ANSI                qualified as Ansi
 import Text.PrettyPrint         hiding ((<>))
-import Control.Lens
-import Data.Text.Lens           (packed, unpacked, IsText)
+import Lens.Micro.Platform
+import Lens.Micro.Platform.Internal
 import System.Exit
 ----------------------------------------------------------------------------------
 
@@ -108,9 +108,6 @@ evalRLPCT opt r = runRLPCT r
 liftErrorful :: (Monad m, IsRlpcError e) => ErrorfulT (MsgEnvelope e) m a -> RLPCT m a
 liftErrorful e = RLPCT $ lift (fmap liftRlpcError `mapErrorful` e)
 
-liftMaybe :: (Monad m) => Maybe a -> RLPCT m a
-liftMaybe m = RLPCT . lift . ErrorfulT . pure $ (m, [])
-
 hoistRlpcT :: (forall a. m a -> n a)
          -> RLPCT m a -> RLPCT n a
 hoistRlpcT f rma = RLPCT $ ReaderT $ \opt ->
@@ -223,9 +220,9 @@ 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/RlpcError.hs

@@ -14,9 +14,6 @@ module Compiler.RlpcError
     -- * Located Comonad
     , Located(..)
     , SrcSpan(..)
-
-    -- * Common error messages
-    , undefinedVariableErr
     )
     where
 ----------------------------------------------------------------------------------
@@ -24,7 +21,8 @@ import Control.Monad.Errorful
 import Data.Text                (Text)
 import Data.Text                qualified as T
 import GHC.Exts                 (IsString(..))
-import Control.Lens
+import Lens.Micro.Platform
+import Lens.Micro.Platform.Internal
 import Compiler.Types
 ----------------------------------------------------------------------------------
 
@@ -77,8 +75,3 @@ debugMsg tag e = MsgEnvelope
     , _msgSeverity = SevDebug tag
     }
 
-undefinedVariableErr :: Text -> RlpcError
-undefinedVariableErr n = Text
-    [ "Variable not in scope: `" <> n <> "'."
-    ]
-

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
-    , pattern (:<$)
+    , srcspanLine, srcspanColumn, srcspanAbs, srcspanLen
     , Located(..)
-    , HasLocation(..)
     , _Located
-    , nolo, nolo'
-
-    , (<~>), (~>), (~~>), (<~~)
-
-    , comb2, comb3, comb4
-    , lochead
+    , located
+    , nolo
+    , (<<~), (<~>), (<#>)
 
     -- * 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 Data.Functor.Foldable
-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)
+import Control.Lens             hiding ((<<~))
+import Language.Haskell.TH.Syntax   (Lift)
 --------------------------------------------------------------------------------
 
 -- | 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))
-
-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 <~~
+located :: Lens (Located a) (Located b) a b
+located = lens extract ($>)
 
 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 = tupling . _1
-srcSpanColumn = tupling . _2
-srcSpanAbs = tupling . _3
-srcSpanLen = tupling . _4
+srcspanLine, srcspanColumn, srcspanAbs, srcspanLen :: Lens' SrcSpan Int
+srcspanLine = tupling . _1
+srcspanColumn = tupling . _2
+srcspanAbs = tupling . _3
+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)
-            GT -> max sb (aa + sa - ab)
+            LT -> max sa (ab + lb - aa)
+            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)
-class CanSet (k :: GetOrSet) where
+infixl 4 <<~
 
-instance CanGet Get
-instance CanGet GetSet
-instance CanSet Set
-instance CanSet GetSet
+-- | Similar to '(<*>)', but with a cokleisli arrow.
 
-data GetSetLens (k :: GetOrSet) s t a b :: Type where
-    Getter_      :: (s -> a)             -> GetSetLens Get s t a b
-    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
+(<~>) :: (Comonad w, Bind w) => w (w a -> b) -> w a -> w b
+mc <~> ma = mc >>- \f -> ma =>> f
 
-type GetSetLens' k s a = GetSetLens k s s a a
+infixl 4 <~>
 
-class HasLocation k s | s -> k where
-    -- location :: (Access k f, Functor f) => LensLike' f s SrcSpan
-    getSetLocation :: GetSetLens' k s SrcSpan
+-- this is getting silly
 
-type family Access (k :: GetOrSet) f where
-    Access GetSet f = Functor f
-    Access Set f = Settable f
-    Access Get f = (Functor f, Contravariant f)
+(<#>) :: (Functor f) => f (a -> b) -> a -> f b
+fab <#> a = fmap ($ a) fab
 
-instance HasLocation GetSet SrcSpan where
-    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)
-
---------------------------------------------------------------------------------
+infixl 4 <#>
 
 makePrisms ''Located
+

src/Control/Monad/Errorful.hs

@@ -20,7 +20,7 @@ import Data.Functor.Identity
 import Data.Coerce
 import Data.HashSet                 (HashSet)
 import Data.HashSet                 qualified as H
-import Control.Lens
+import Lens.Micro
 ----------------------------------------------------------------------------------
 
 newtype ErrorfulT e m a = ErrorfulT { runErrorfulT :: m (Maybe a, [e]) }

src/Core.hs

@@ -1,5 +1,6 @@
 module Core
     ( module Core.Syntax
+    , parseCore
     , parseCoreProg
     , parseCoreExpr
     , lexCore

src/Core/Examples.hs

@@ -8,11 +8,15 @@ module Core.Examples where
 ----------------------------------------------------------------------------------
 import Core.Syntax
 import Core.TH
+import Rlp.TH
 ----------------------------------------------------------------------------------
 
-letRecExample = undefined
+-- fac3 = undefined
+-- sumList = undefined
+-- constDivZero = undefined
+-- idCase = undefined
 
-{--
+---
 
 letrecExample :: Program'
 letrecExample = [coreProg|
@@ -241,3 +245,17 @@ namedConsCase = [coreProg|
 
 --}
 
+qsort = [rlpProg|
+    data List a = Nil | Cons a (List a)
+
+    list = Cons 9 (Cons 2 (Cons 3 (Cons 2
+                (Cons 5 (Cons 2 (Cons 12 (Cons 89 Nil)))))))
+
+    id x = x
+
+    main = case list of
+        Nil -> Nil
+        Cons a as -> let lesser = as
+                     in print# lesser
+|]
+

src/Core/HindleyMilner.hs

@@ -16,7 +16,9 @@ module Core.HindleyMilner
     )
     where
 ----------------------------------------------------------------------------------
-import Control.Lens             hiding (Context', Context)
+import Lens.Micro
+import Lens.Micro.Mtl
+import Lens.Micro.Platform
 import Data.Maybe               (fromMaybe)
 import Data.Text                qualified as T
 import Data.Pretty              (rpretty)
@@ -35,12 +37,6 @@ import Text.Printf
 import Core.Syntax
 ----------------------------------------------------------------------------------
 
-infer = undefined
-check = undefined
-checkCoreProg = undefined
-checkCoreProgR = undefined
-checkCoreExprR = undefined
-
 -- | Annotated typing context -- I have a feeling we're going to want this in the
 -- future.
 type Context b = [(b, Type)]
@@ -80,8 +76,6 @@ instance IsRlpcError TypeError where
 -- throw any number of fatal or nonfatal errors. Run with @runErrorful@.
 type HMError = Errorful TypeError
 
-{--
-
 -- | Assert that an expression unifies with a given type
 --
 -- >>> let e = [coreProg|3|]
@@ -284,4 +278,3 @@ demoContext =
     , ("False", TyCon "Bool")
     ]
 
---}

src/Core/Lex.x

@@ -26,7 +26,8 @@ import Compiler.RLPC
 import Compiler.Types
 -- TODO: unify Located definitions
 import Compiler.RlpcError
-import Control.Lens
+import Lens.Micro
+import Lens.Micro.TH
 }
 
 %wrapper "monad-strict-text"
@@ -78,7 +79,7 @@ rlp :-
     "{"                     { constTok TokenLBrace }
     "}"                     { constTok TokenRBrace }
     ";"                     { constTok TokenSemicolon }
-    ":"                     { constTok TokenHasType }
+    "::"                    { constTok TokenHasType }
     "@"                     { constTok TokenTypeApp }
     "{-#"                   { constTok TokenLPragma `andBegin` pragma }
 

src/Core/Parse.y

@@ -5,12 +5,14 @@ Description : Parser for the Core language
 -}
 {-# LANGUAGE OverloadedStrings, ViewPatterns #-}
 module Core.Parse
-    ( parseCoreExpr
+    ( parseCore
+    , parseCoreExpr
     , parseCoreExprR
     , parseCoreProg
     , parseCoreProgR
     , module Core.Lex -- temp convenience
     , SrcError
+    , Module
     )
     where
 
@@ -22,7 +24,7 @@ import Core.Syntax
 import Core.Lex
 import Compiler.RLPC
 import Control.Monad
-import Control.Lens         hiding (snoc)
+import Lens.Micro
 import Data.Default.Class   (def)
 import Data.Hashable        (Hashable)
 import Data.List.Extra
@@ -30,19 +32,19 @@ import Data.Text.IO         qualified as TIO
 import Data.Text            (Text)
 import Data.Text            qualified as T
 import Data.HashMap.Strict  qualified as H
-
-import Core.Parse.Types
 }
 
+%name parseCore Module
 %name parseCoreExpr StandaloneExpr
 %name parseCoreProg StandaloneProgram
 %tokentype { Located CoreToken }
 %error { parseError }
-%monad { P }
+%monad { RLPC } { happyBind } { happyPure }
 
 %token
       let             { Located _ TokenLet }
       letrec          { Located _ TokenLetrec }
+      module          { Located _ TokenModule }
       where           { Located _ TokenWhere }
       case            { Located _ TokenCase }
       of              { Located _ TokenOf }
@@ -66,27 +68,29 @@ import Core.Parse.Types
       '{-#'           { Located _ TokenLPragma }
       '#-}'           { Located _ TokenRPragma }
       ';'             { Located _ TokenSemicolon }
-      ':'             { Located _ TokenHasType }
+      '::'            { Located _ TokenHasType }
       eof             { Located _ TokenEOF }
 
-%right '->'
-
 %%
 
+Module          :: { Module Name }
+Module          : module conname where Program Eof { Module (Just ($2, [])) $4 }
+                | Program Eof                      { Module Nothing $1 }
+
 Eof             :: { () }
 Eof             : eof           { () }
                 | error         { () }
 
-StandaloneProgram :: { Program Var }
+StandaloneProgram :: { Program Name }
 StandaloneProgram : Program eof                 { $1 }
 
-Program         :: { Program Var }
-                : TypedScDef ';' Program    { $3 & insTypeSig (fst $1)
-                                                 & insScDef (snd $1) }
-                | TypedScDef OptSemi        { mempty & insTypeSig (fst $1)
-                                                     & insScDef (snd $1) }
-                | TLPragma Program          {% doTLPragma $1 $2 }
-                | TLPragma                  {% doTLPragma $1 mempty }
+Program         :: { Program Name }
+Program         : ScTypeSig ';' Program         { insTypeSig $1 $3 }
+                | ScTypeSig OptSemi             { singletonTypeSig $1 }
+                | ScDef     ';' Program         { insScDef $1 $3 }
+                | ScDef     OptSemi             { singletonScDef $1 }
+                | TLPragma  Program             {% doTLPragma $1 $2 }
+                | TLPragma                      {% doTLPragma $1 mempty }
 
 TLPragma        :: { Pragma }
                 : '{-#' Words '#-}'             { Pragma $2 }
@@ -100,152 +104,140 @@ OptSemi         : ';'                           { () }
                 | {- epsilon -}                 { () }
 
 ScTypeSig       :: { (Name, Type) }
-ScTypeSig       : Id ':' Type                   { ($1, $3) }
+ScTypeSig       : Var '::' Type                 { ($1,$3) }
 
-TypedScDef      :: { (Var, ScDef Var) }
-                : Id ':' Type ';' Id ParList '=' Expr
-                            { (MkVar $1 $3, mkTypedScDef $1 $3 $5 $6 $8) }
+ScDefs          :: { [ScDef Name] }
+ScDefs          : ScDef ';' ScDefs              { $1 : $3 }
+                | ScDef ';'                     { [$1] }
+                | ScDef                         { [$1] }
 
--- ScDefs          :: { [ScDef PsName] }
--- ScDefs          : ScDef ';' ScDefs              { $1 : $3 }
---                 | ScDef ';'                     { [$1] }
---                 | ScDef                         { [$1] }
--- 
--- ScDef           :: { ScDef PsName }
--- ScDef           : Id ParList '=' Expr   { ScDef (Left $1) $2
---                                                 ($4 & binders %~ Right) }
+ScDef           :: { ScDef Name }
+ScDef           : Var ParList '=' Expr          { ScDef $1 $2 $4 }
+                -- hack to allow constructors to be compiled into scs
+                | Con ParList '=' Expr          { ScDef $1 $2 $4 }
 
 Type            :: { Type }
-                : TypeApp '->' TypeApp              { $1 :-> $3 }
-                | TypeApp                         { $1 }
-
-TypeApp         :: { Type }
-                : TypeApp Type1                 { TyApp $1 $2 }
-                | Type1                         { $1 }
-
--- do we want to allow symbolic names for tyvars and tycons?
+Type            : Type1                         { $1 }
 
 Type1           :: { Type }
 Type1           : '(' Type ')'                  { $2 }
+                | Type1 '->' Type               { $1 :-> $3 }
+                -- do we want to allow symbolic names for tyvars and tycons?
                 | varname                       { TyVar $1 }
-                | conname                       { if $1 == "Type"
-                                                    then TyKindType else TyCon $1 }
+                | conname                       { TyCon $1 }
 
-ParList      :: { [Name] }
-ParList      : varname ParList            { $1 : $2 }
-             | {- epsilon -}                 { [] }
+ParList         :: { [Name] }
+ParList         : Var ParList                   { $1 : $2 }
+                | {- epsilon -}                 { [] }
 
-StandaloneExpr  :: { Expr Var }
+StandaloneExpr  :: { Expr Name }
 StandaloneExpr  : Expr eof                      { $1 }
 
-Expr            :: { Expr Var }
+Expr            :: { Expr Name }
 Expr            : LetExpr                       { $1 }
                 | 'λ' Binders '->' Expr         { Lam $2 $4 }
                 | Application                   { $1 }
                 | CaseExpr                      { $1 }
                 | Expr1                         { $1 }
 
-LetExpr         :: { Expr Var }
+LetExpr         :: { Expr Name }
 LetExpr         : let    '{'   Bindings '}'    in Expr { Let NonRec $3 $6 }
                 | letrec '{'   Bindings '}'    in Expr { Let Rec $3 $6 }
 
-Binders         :: { [Var] }
+Binders         :: { [Name] }
 Binders         : Var Binders                  { $1 : $2 }
                 | Var                          { [$1] }
 
-Application     :: { Expr Var }
-Application     : Application AppArg           { App $1 $2 }
-                | Expr1       AppArg           { App $1 $2 }
+Application     :: { Expr Name }
+Application     : Expr1 AppArgs                { foldl' App $1 $2 }
 
-AppArg          :: { Expr Var }
-                : '@' Type1                     { Type $2 }
-                | Expr1                         { $1 }
+AppArgs         :: { [Expr Name] }
+AppArgs         : Expr1 AppArgs                 { $1 : $2 }
+                | Expr1                         { [$1] }
 
-CaseExpr        :: { Expr Var }
+CaseExpr        :: { Expr Name }
 CaseExpr        : case Expr of '{' Alters '}'   { Case $2 $5 }
 
-Alters          :: { [Alter Var] }
+Alters          :: { [Alter Name] }
 Alters          : Alter ';' Alters              { $1 : $3 }
                 | Alter ';'                     { [$1] }
                 | Alter                         { [$1] }
 
-Alter           :: { Alter Var }
-Alter           : alttag  AltParList '->' Expr     { Alter (AltTag  $1) $2 $4 }
-                | conname AltParList '->' Expr     { Alter (AltData $1) $2 $4 }
+Alter           :: { Alter Name }
+Alter           : alttag ParList '->' Expr      { Alter (AltTag  $1) $2 $4 }
+                | Con    ParList '->' Expr      { Alter (AltData $1) $2 $4 }
 
-AltParList      :: { [Var] }
-                : Var AltParList                { $1 : $2 }
-                | {- epsilon -}                 { [] }
-
-Expr1           :: { Expr Var }
+Expr1           :: { Expr Name }
 Expr1           : litint                        { Lit $ IntL $1 }
                 | Id                            { Var $1 }
                 | PackCon                       { $1 }
                 | '(' Expr ')'                  { $2 }
 
-PackCon         :: { Expr Var }
+PackCon         :: { Expr Name }
 PackCon         : pack '{' litint litint '}'    { Con $3 $4 }
 
-Bindings        :: { [Binding Var] }
+Bindings        :: { [Binding Name] }
 Bindings        : Binding ';' Bindings          { $1 : $3 }
                 | Binding ';'                   { [$1] }
                 | Binding                       { [$1] }
 
-Binding         :: { Binding Var }
+Binding         :: { Binding Name }
 Binding         : Var '=' Expr                  { $1 := $3 }
 
 Id              :: { Name }
-                : varname                           { $1 }
-                | conname                           { $1 }
+Id              : Var                                { $1 }
+                | Con                                { $1 }
 
-Var             :: { Var }
-Var             : '(' varname ':' Type ')'          { MkVar $2 $4 }
+Var             :: { Name }
+Var             : varname                           { $1 }
+                | varsym                            { $1 }
+
+Con             :: { Name }
+Con             : conname                           { $1 }
+                | consym                            { $1 }
 
 {
 
-parseError :: [Located CoreToken] -> P a
+parseError :: [Located CoreToken] -> RLPC a
 parseError (Located _ t : _) =
     error $ "<line>" <> ":" <> "<col>"
          <> ": parse error at token `" <> show t <> "'"
 
-exprPragma :: [String] -> RLPC (Expr Var)
+{-# WARNING parseError "unimpl" #-}
+
+exprPragma :: [String] -> RLPC (Expr Name)
 exprPragma ("AST" : e) = undefined
 exprPragma _           = undefined
 
-astPragma :: [String] -> RLPC (Expr Var)
+{-# WARNING exprPragma "unimpl" #-}
+
+astPragma :: [String] -> RLPC (Expr Name)
 astPragma _ = undefined
 
--- insTypeSig :: (Hashable b) => (b, Type) -> Program b -> Program b
--- insTypeSig ts = programTypeSigs %~ uncurry H.insert ts
+{-# WARNING astPragma "unimpl" #-}
 
-insTypeSig :: Var -> Program Var -> Program Var
-insTypeSig w@(MkVar _ t) = programTypeSigs %~ H.insert w t
+insTypeSig :: (Hashable b) => (b, Type) -> Program b -> Program b
+insTypeSig ts = programTypeSigs %~ uncurry H.insert ts
 
--- singletonTypeSig :: (Hashable b) => (b, Type) -> Program b
--- singletonTypeSig ts = insTypeSig ts mempty
+singletonTypeSig :: (Hashable b) => (b, Type) -> Program b
+singletonTypeSig ts = insTypeSig ts mempty
 
 insScDef :: (Hashable b) => ScDef b -> Program b -> Program b
 insScDef sc = programScDefs %~ (sc:)
 
--- singletonScDef :: (Hashable b) => ScDef b -> Program b
--- singletonScDef sc = insScDef sc mempty
+singletonScDef :: (Hashable b) => ScDef b -> Program b
+singletonScDef sc = insScDef sc mempty
 
-parseCoreExprR :: (Monad m) => [Located CoreToken] -> RLPCT m (Expr Var)
-parseCoreExprR = liftMaybe . snd . flip runP def . parseCoreExpr
+parseCoreExprR :: (Monad m) => [Located CoreToken] -> RLPCT m Expr'
+parseCoreExprR = hoistRlpcT generalise . parseCoreExpr
 
-parseCoreProgR :: forall m. (Monad m)
-               => [Located CoreToken] -> RLPCT m (Program Var)
-parseCoreProgR s = do
-    let p = runP (parseCoreProg s) def
-    case p of
-        (st, Just a) -> do
-            ddumpast a
-            pure a
-  where
-    ddumpast :: Show a => Program a -> RLPCT m (Program a)
-    ddumpast p = do
-        addDebugMsg "dump-parsed-core" . show $ p
-        pure p
+parseCoreProgR :: forall m. (Monad m) => [Located CoreToken] -> RLPCT m Program'
+parseCoreProgR = ddumpast <=< (hoistRlpcT generalise . parseCoreProg)
+    where
+        ddumpast :: Program' -> RLPCT m Program'
+        ddumpast p = do
+            addDebugMsg "dump-parsed-core" . show $ p
+            pure p
 
 happyBind :: RLPC a -> (a -> RLPC b) -> RLPC b
 happyBind m k = m >>= k
@@ -253,7 +245,7 @@ happyBind m k = m >>= k
 happyPure :: a -> RLPC a
 happyPure a = pure a
 
-doTLPragma :: Pragma -> Program Var -> P (Program Var)
+doTLPragma :: Pragma -> Program' -> RLPC Program'
 -- TODO: warn unrecognised pragma
 doTLPragma (Pragma []) p = pure p
 

src/Core/Parse/Types.hs

@@ -1,62 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-module Core.Parse.Types
-    ( P(..)
-    , psTyVars
-    , def
-    , PsName
-    , mkTypedScDef
-    )
-    where
---------------------------------------------------------------------------------
-import Control.Applicative
-import Control.Monad
-import Control.Monad.State
-import Data.Default
-import Data.Maybe
-import Data.Tuple               (swap)
-
-import Control.Lens
-
-import Core.Syntax
---------------------------------------------------------------------------------
-
-newtype P a = P { runP :: PState -> (PState, Maybe a) }
-    deriving Functor
-
-data PState = PState
-    { _psTyVars :: [(Name, Kind)]
-    }
-
-instance Applicative P where
-    pure a = P (, Just a)
-
-    P pf <*> P pa = P \st ->
-        let (st',mf) = pf st
-            (st'',ma) = pa st'
-        in (st'', mf <*> ma)
-
-instance Monad P where
-    P pa >>= k = P \st ->
-        let (st',ma) = pa st
-        in case ma of
-            Just a -> runP (k a) st'
-            Nothing -> (st', Nothing)
-
-instance MonadState PState P where
-    state = P . fmap ((_2 %~ Just) . review swapped)
-
-instance Default PState where
-    def = undefined
-
-makeLenses ''PState
-
-type PsName = Either Name Var
-
---------------------------------------------------------------------------------
-
-mkTypedScDef :: Name -> Type -> Name -> [Name] -> Expr Var -> ScDef Var
-mkTypedScDef nt tt n as e | nt == n = ScDef n' as' e
-    where
-        n' = MkVar n tt
-        as' = zipWith MkVar as (tt ^.. arrowStops)
-

src/Core/Syntax.hs

@@ -7,38 +7,39 @@ Description : Core ASTs and the like
 {-# LANGUAGE TemplateHaskell #-}
 -- for recursion-schemes
 {-# LANGUAGE DeriveTraversable, TypeFamilies #-}
-{-# LANGUAGE UndecidableInstances #-}
-{-# LANGUAGE QuantifiedConstraints #-}
 module Core.Syntax
-    (
-    -- * Core AST
-      ExprF(..), ExprF'
-    , ScDef(..), ScDef'
-    , Program(..), Program'
-    , Type(..), Kind, pattern (:->), pattern TyInt
-    , AlterF(..), Alter(..), Alter', AltCon(..)
-    , pattern Binding, pattern Alter
-    , Rec(..), Lit(..)
+    ( Expr(..)
+    , ExprF(..)
+    , ExprF'(..)
+    , Type(..)
+    , pattern TyInt
+    , Lit(..)
+    , pattern (:$)
+    , pattern (:@)
+    , pattern (:->)
+    , Binding(..)
+    , AltCon(..)
+    , pattern (:=)
+    , Rec(..)
+    , Alter(..)
+    , Name
+    , Tag
+    , ScDef(..)
+    , Module(..)
+    , Program(..)
+    , Program'
     , Pragma(..)
-    -- ** Variables and identifiers
-    , Name, Var(..), Tag, pattern (:^)
-    , Binding, BindingF(..), pattern (:=), pattern (:$)
-    , type Binding'
-    -- ** Working with the fixed point of ExprF
-    , Expr, Expr'
-    , pattern Con, pattern Var, pattern App, pattern Lam, pattern Let
-    , pattern Case, pattern Type, pattern Lit
-
-    -- * Pretty-printing
-    , Pretty(pretty), WithTerseBinds(..)
-
-    -- * Optics
-    , programScDefs, programTypeSigs, programDataTags
-    , formalising
-    , HasRHS(_rhs), HasLHS(_lhs)
-    , _BindingF, _MkVar
-    -- ** Classy optics
-    , HasBinders(..), HasArrowStops(..), HasApplicants1(..), HasApplicants(..)
+    , unliftScDef
+    , programScDefs
+    , programTypeSigs
+    , programDataTags
+    , Expr'
+    , ScDef'
+    , Alter'
+    , Binding'
+    , HasRHS(_rhs)
+    , HasLHS(_lhs)
+    , Pretty(pretty)
     )
     where
 ----------------------------------------------------------------------------------
@@ -46,183 +47,111 @@ import Data.Coerce
 import Data.Pretty
 import Data.List                    (intersperse)
 import Data.Function                ((&))
+import Data.Functor.Foldable
+import Data.Functor.Foldable.TH     (makeBaseFunctor)
 import Data.String
 import Data.HashMap.Strict          (HashMap)
 import Data.HashMap.Strict          qualified as H
 import Data.Hashable
-import Data.Foldable                (traverse_)
-import Data.Functor
-import Data.Monoid
-import Data.Functor.Classes
 import Data.Text                    qualified as T
 import Data.Char
 import Data.These
+import Data.Bifoldable              (bifoldr)
 import GHC.Generics                 (Generic, Generically(..))
-import Text.Show.Deriving
-import Data.Eq.Deriving
-import Data.Kind                    qualified
-
-import Data.Fix                     hiding (cata, ana)
-import Data.Bifunctor               (Bifunctor(..))
-import Data.Bifoldable              (bifoldr, Bifoldable(..))
-import Data.Bifunctor.TH
-import Data.Bitraversable
-import Data.Functor.Foldable
-import Data.Functor.Foldable.TH     (makeBaseFunctor)
-
 -- Lift instances for the Core quasiquoters
-import Misc
-import Misc.Lift1
+import Language.Haskell.TH.Syntax   (Lift)
+-- import Lens.Micro.TH                (makeLenses)
+-- import Lens.Micro
 import Control.Lens
 ----------------------------------------------------------------------------------
 
-data ExprF b a = VarF Name
-               | ConF Tag Int -- ^ Con Tag Arity
-               | CaseF a [AlterF b a]
-               | LamF [b] a
-               | LetF Rec [BindingF b a] a
-               | AppF a a
-               | LitF Lit
-               | TypeF Type
-               deriving (Functor, Foldable, Traversable)
+data Expr b = Var Name
+            | Con Tag Int -- ^ Con Tag Arity
+            | Case (Expr b) [Alter b]
+            | Lam [b] (Expr b)
+            | Let Rec [Binding b] (Expr b)
+            | App (Expr b) (Expr b)
+            | Lit Lit
+            deriving (Show, Read, Lift)
 
-type Expr b = Fix (ExprF b)
-
-instance IsString (ExprF b a) where
-    fromString = VarF . fromString
-
-instance (IsString (f (Fix f))) => IsString (Fix f) where
-    fromString = Fix . fromString
+deriving instance (Eq b) => Eq (Expr b)
 
 data Type = TyFun
           | TyVar Name
           | TyApp Type Type
           | TyCon Name
-          | TyForall Var Type
-          | TyKindType
-          deriving (Show, Eq, Lift)
-
-type Kind = Type
-
--- data TyCon = MkTyCon Name Kind
---     deriving (Eq, Show, Lift)
-
-data Var = MkVar Name Type
-    deriving (Eq, Show, Lift)
-
-pattern (:^) :: Name -> Type -> Var
-pattern n :^ t = MkVar n t
-
-instance Hashable Var where
-    hashWithSalt s (MkVar n _) = hashWithSalt s n
-
-pattern Con :: Tag -> Int -> Expr b
-pattern Con t a = Fix (ConF t a)
-
-pattern Var :: Name -> Expr b
-pattern Var b = Fix (VarF b)
-
-pattern App :: Expr b -> Expr b -> Expr b
-pattern App f x = Fix (AppF f x)
-
-pattern Lam :: [b] -> Expr b -> Expr b
-pattern Lam bs e = Fix (LamF bs e)
-
-pattern Let :: Rec -> [Binding b] -> Expr b -> Expr b
-pattern Let r bs e = Fix (LetF r bs e)
-
-pattern Case :: Expr b -> [Alter b] -> Expr b
-pattern Case e as = Fix (CaseF e as)
-
-pattern Type :: Type -> Expr b
-pattern Type t = Fix (TypeF t)
-
-pattern Lit :: Lit -> Expr b
-pattern Lit t = Fix (LitF t)
+          deriving (Show, Read, Lift, Eq)
 
 pattern TyInt :: Type
 pattern TyInt = TyCon "Int#"
 
+infixl 2 :$
+pattern (:$) :: Expr b -> Expr b -> Expr b 
+pattern f :$ x = App f x
+
+infixl 2 :@
+pattern (:@) :: Type -> Type -> Type
+pattern f :@ x = TyApp f x
+
 infixr 1 :->
 pattern (:->) :: Type -> Type -> Type
 pattern a :-> b = TyApp (TyApp TyFun a) b
 
-data BindingF b a = BindingF b (ExprF b a)
-    deriving (Functor, Foldable, Traversable)
+{-# COMPLETE Binding :: Binding #-}
+{-# COMPLETE (:=) :: Binding #-}
+data Binding b = Binding b (Expr b)
+    deriving (Show, Read, Lift)
 
-type Binding b = BindingF b (Fix (ExprF b))
-
-type Binding' = Binding Name
-
--- collapse = foldFix embed
-
-pattern Binding :: b -> Expr b -> Binding b
-pattern Binding k v <- BindingF k (wrapFix -> v)
-    where Binding k v = BindingF k (unwrapFix v)
-
-{-# COMPLETE (:=) #-}
-{-# COMPLETE Binding #-}
+deriving instance (Eq b) => Eq (Binding b)
 
 infixl 1 :=
 pattern (:=) :: b -> Expr b -> Binding b
 pattern k := v = Binding k v
 
-infixl 2 :$
-pattern (:$) :: Expr b -> Expr b -> Expr b
-pattern f :$ x = App f x
+data Alter b = Alter AltCon [b] (Expr b)
+    deriving (Show, Read, Lift)
 
-data AlterF b a = AlterF AltCon [b] (ExprF b a)
-    deriving (Functor, Foldable, Traversable)
-
-pattern Alter :: AltCon -> [b] -> Expr b -> Alter b
-pattern Alter con bs e <- AlterF con bs (wrapFix -> e)
-    where Alter con bs e = AlterF con bs (unwrapFix e)
-
-type Alter b = AlterF b (Fix (ExprF b))
-
-type Alter' = Alter Name
-
--- pattern Alter :: AltCon -> [b] -> Expr b -> Alter b
--- pattern Alter con bs e <- Fix (AlterF con bs (undefined -> e))
---     where Alter con bs e = Fix (AlterF con bs undefined)
+deriving instance (Eq b) => Eq (Alter b)
 
 newtype Pragma = Pragma [T.Text]
 
 data Rec = Rec
          | NonRec
-         deriving (Show, Eq, Lift)
+         deriving (Show, Read, Eq, Lift)
 
 data AltCon = AltData Name
             | AltTag Tag
             | AltLit Lit
             | AltDefault
-            deriving (Show, Eq, Lift)
+            deriving (Show, Read, Eq, Lift)
 
 newtype Lit = IntL Int
-    deriving (Show, Eq, Lift)
+    deriving (Show, Read, Eq, Lift)
 
 type Name = T.Text
 type Tag = Int
 
 data ScDef b = ScDef b [b] (Expr b)
+    deriving (Show, Lift)
 
--- unliftScDef :: ScDef b -> Expr b
--- unliftScDef (ScDef _ as e) = Lam as e
+unliftScDef :: ScDef b -> Expr b
+unliftScDef (ScDef _ as e) = Lam as e
 
 data Module b = Module (Maybe (Name, [Name])) (Program b)
+    deriving (Show, Lift)
 
 data Program b = Program
     { _programScDefs   :: [ScDef b]
     , _programTypeSigs :: HashMap b Type
-    , _programDataTags :: HashMap Name (Tag, Int)
+    , _programDataTags :: HashMap b (Tag, Int)
     -- ^ map constructors to their tag and arity
     }
-    deriving (Generic)
+    deriving (Show, Lift, Generic)
     deriving (Semigroup, Monoid)
         via Generically (Program b)
 
 makeLenses ''Program
--- makeBaseFunctor ''Expr
+makeBaseFunctor ''Expr
 pure []
 
 -- this is a weird optic, stronger than Lens and Prism, but weaker than Iso.
@@ -236,115 +165,65 @@ type ExprF' = ExprF Name
 type Program' = Program Name
 type Expr' = Expr Name
 type ScDef' = ScDef Name
--- type Alter' = Alter Name
--- type Binding' = Binding Name
+type Alter' = Alter Name
+type Binding' = Binding Name
 
--- instance IsString (Expr b) where
---     fromString = Var . fromString
+instance IsString (Expr b) where
+    fromString = Var . fromString
+
+instance IsString Type where
+    fromString "" = error "IsString Type string may not be empty"
+    fromString s
+        | isUpper c     = TyCon . fromString $ s
+        | otherwise     = TyVar . fromString $ s
+        where (c:_) = s
 
 ----------------------------------------------------------------------------------
 
 class HasRHS s t a b | s -> a, t -> b, s b -> t, t a -> s where
     _rhs :: Lens s t a b
 
-instance HasRHS (AlterF b a) (AlterF b a') (ExprF b a) (ExprF b a') where
+instance HasRHS (Alter b) (Alter b) (Expr b) (Expr b) where
     _rhs = lens
-        (\ (AlterF _ _ e) -> e)
-        (\ (AlterF t as _) e' -> AlterF t as e')
+        (\ (Alter _ _ e) -> e)
+        (\ (Alter t as _) e' -> Alter t as e')
 
 instance HasRHS (ScDef b) (ScDef b) (Expr b) (Expr b) where
     _rhs = lens
         (\ (ScDef _ _ e) -> e)
         (\ (ScDef n as _) e' -> ScDef n as e')
 
-instance HasRHS (BindingF b a) (BindingF b' a') (ExprF b a) (ExprF b' a')
+instance HasRHS (Binding b) (Binding b) (Expr b) (Expr b) where
+    _rhs = lens
+        (\ (_ := e) -> e)
+        (\ (k := _) e' -> k := e')
 
 class HasLHS s t a b | s -> a, t -> b, s b -> t, t a -> s where
     _lhs :: Lens s t a b
 
+instance HasLHS (Alter b) (Alter b) (AltCon, [b]) (AltCon, [b]) where
+    _lhs = lens
+        (\ (Alter a bs _) -> (a,bs))
+        (\ (Alter _ _ e) (a',bs') -> Alter a' bs' e)
+
 instance HasLHS (ScDef b) (ScDef b) (b, [b]) (b, [b]) where
     _lhs = lens
         (\ (ScDef n as _) -> (n,as))
         (\ (ScDef _ _ e) (n',as') -> ScDef n' as' e)
 
--- instance HasLHS (Binding b) (Binding b) b b where
-    -- _lhs = lens
-    --     (\ (k := _) -> k)
-    --     (\ (_ := e) k' -> k' := e)
-
--- | This is not a valid isomorphism for expressions containing lambdas whose
--- bodies are themselves lambdas with multiple arguments:
---
--- >>> [coreExpr|\x -> \y z -> x|] ^. from (from formalising)
--- Lam ["x"] (Lam ["y"] (Lam ["z"] (Var "x")))
--- >>> [coreExpr|\x -> \y z -> x|]
--- Lam ["x"] (Lam ["y","z"] (Var "x"))
---
--- For this reason, it's best to consider 'formalising' as if it were two
--- unrelated unidirectional getters.
-
-formalising :: Iso (Expr a) (Expr b) (Expr a) (Expr b)
-formalising = iso sa bt where
-    sa :: Expr a -> Expr a
-    sa = ana \case
-        Lam [b] e      -> LamF [b] e
-        Lam (b:bs) e   -> LamF [b] (Lam bs e)
-        Let r (b:bs) e -> LetF r [b] (Let r bs e)
-        x              -> project x
-
-    bt :: Expr b -> Expr b
-    bt = cata \case
-        LamF [b] (Lam bs e)                -> Lam (b:bs) e
-        LetF r [b] (Let r' bs e) | r == r' -> Let r (b:bs) e
-        x                                  -> embed x
+instance HasLHS (Binding b) (Binding b) b b where
+    _lhs = lens
+        (\ (k := _) -> k)
+        (\ (_ := e) k' -> k' := e)
 
 --------------------------------------------------------------------------------
 
-newtype WithTerseBinds a = WithTerseBinds a
-
-class MakeTerse a where
-    type AsTerse a :: Data.Kind.Type
-    asTerse :: a -> AsTerse a
-
-instance MakeTerse Var where
-    type AsTerse Var = Name
-    asTerse (MkVar n _) = n
-
-instance (Hashable b, Pretty b, Pretty (AsTerse b), MakeTerse b)
-      => Pretty (WithTerseBinds (Program b)) where
-    pretty (WithTerseBinds p)
-            = (datatags <> "\n")
-          $+$ defs
-        where
-            datatags = ifoldrOf (programDataTags . ifolded) cataDataTag mempty p
-            defs = vlinesOf (programJoinedDefs . to prettyGroup) p
-
-            programJoinedDefs :: Fold (Program b) (These (b, Type) (ScDef b))
-            programJoinedDefs = folding $ \p ->
-                foldMapOf programTypeSigs thisTs p
-                `u` foldMapOf programScDefs thatSc p
-              where u = H.unionWith unionThese
-
-            thisTs = ifoldMap @b @(HashMap b)
-                (\n t -> H.singleton n (This (n,t)))
-            thatSc = foldMap $ \sc ->
-                H.singleton (sc ^. _lhs . _1) (That sc)
-
-            prettyGroup :: These (b, Type) (ScDef b) -> Doc
-            prettyGroup = bifoldr vs vs mempty
-                        . bimap (uncurry prettyTySig')
-                                (pretty . WithTerseBinds)
-                where vs = vsepTerm ";"
-
-            cataDataTag n (t,a) acc = prettyDataTag n t a $+$ acc
-
+-- TODO: print type sigs with corresponding scdefs
+-- TODO: emit pragmas for datatags
 instance (Hashable b, Pretty b) => Pretty (Program b) where
-    pretty p = (datatags <> "\n")
-           $+$ defs
+    pretty p = ifoldrOf (programDataTags . ifolded) cataDataTag mempty p
+           $+$ vlinesOf (programJoinedDefs . to prettyGroup) p
         where
-            datatags = ifoldrOf (programDataTags . ifolded) cataDataTag mempty p
-            defs = vlinesOf (programJoinedDefs . to prettyGroup) p
-
             programJoinedDefs :: Fold (Program b) (These (b, Type) (ScDef b))
             programJoinedDefs = folding $ \p ->
                 foldMapOf programTypeSigs thisTs p
@@ -357,339 +236,67 @@ instance (Hashable b, Pretty b) => Pretty (Program b) where
                 H.singleton (sc ^. _lhs . _1) (That sc)
 
             prettyGroup :: These (b, Type) (ScDef b) -> Doc
-            prettyGroup = bifoldr vs vs mempty
-                        . bimap (uncurry prettyTySig) pretty
-                where vs = vsepTerm ";"
+            prettyGroup = bifoldr ($$) ($$) mempty . bimap prettyTySig pretty
+
+            prettyTySig (n,t) = hsep [ttext n, "::", pretty t]
+
+            unionThese (This a) (That b) = These a b
+            unionThese (That b) (This a) = These a b
+            unionThese (These a b) _     = These a b
 
             cataDataTag n (t,a) acc = prettyDataTag n t a $+$ acc
 
-unionThese :: These a b -> These a b -> These a b
-unionThese (This a) (That b) = These a b
-unionThese (That b) (This a) = These a b
-unionThese (These a b) _     = These a b
-
-prettyDataTag :: (Pretty n, Pretty t, Pretty a)
-              => n -> t -> a -> Doc
-prettyDataTag n t a =
-    hsep ["{-#", "PackData", ttext n, ttext t, ttext a, "#-}"]
-
-prettyTySig :: (Pretty n, Pretty t) => n -> t -> Doc
-prettyTySig n t = hsep [ttext n, ":", pretty t]
-
-prettyTySig' :: (MakeTerse n, Pretty (AsTerse n), Pretty t) => n -> t -> Doc
-prettyTySig' n t = hsep [ttext (asTerse n), ":", pretty t]
-
--- Pretty Type
--- TyApp | appPrec   | left
--- (:->) | appPrec-1 | right
+            prettyDataTag n t a =
+                hsep ["{-#", "PackData", ttext n, ttext t, ttext a, "#-}"]
 
 instance Pretty Type where
-    prettyPrec _ (TyVar n)   = ttext n
-    prettyPrec _ TyFun       = "(->)"
-    prettyPrec _ (TyCon n)   = ttext n
-    prettyPrec p (a :-> b)   = maybeParens (p>appPrec-1) $
-        hsep [prettyPrec appPrec a, "->", prettyPrec (appPrec-1) b]
-    prettyPrec p (TyApp f x) = maybeParens (p>appPrec) $
-        prettyPrec appPrec f <+> prettyPrec appPrec1 x
-    prettyPrec p (TyForall a m) = maybeParens (p>appPrec-2) $
-        "∀" <+> (prettyPrec appPrec1 a <> ".") <+> pretty m
-    prettyPrec _ TyKindType = "Type"
-
-instance (Pretty b, Pretty (AsTerse b), MakeTerse b)
-      => Pretty (WithTerseBinds (ScDef b)) where
-    pretty (WithTerseBinds sc) = hsep [name, as, "=", hang empty 1 e]
-        where
-            name = ttext $ sc ^. _lhs . _1 . to asTerse
-            as = sc & hsepOf (_lhs . _2 . each . to asTerse . to ttext)
-            e = pretty $ sc ^. _rhs
+    prettyPrec _ (TyVar n) = ttext n
+    prettyPrec _ TyFun = "(->)"
+    prettyPrec _ (TyCon n) = ttext n
+    prettyPrec p (a :-> b) = maybeParens (p>0) $
+        hsep [prettyPrec 1 a, "->", prettyPrec 0 b]
+    prettyPrec p (TyApp f x) = maybeParens (p>1) $
+        prettyPrec 1 f <+> prettyPrec 2 x
 
 instance (Pretty b) => Pretty (ScDef b) where
-    pretty sc = hsep [name, as, "=", hang empty 1 e]
+    pretty sc = hsep [name, as, "=", hang empty 1 e, ";"]
         where
             name = ttext $ sc ^. _lhs . _1
             as = sc & hsepOf (_lhs . _2 . each . to ttext)
             e = pretty $ sc ^. _rhs
 
-instance (Pretty (f (Fix f))) => Pretty (Fix f) where
-    prettyPrec d (Fix f) = prettyPrec d f
-
--- Pretty Expr
--- LamF | appPrec1 | right
--- AppF | appPrec  | left
-
-instance (Pretty b, Pretty a) => Pretty (ExprF b a) where
-    prettyPrec _ (VarF n) = ttext n
-    prettyPrec _ (ConF t a) = "Pack{" <> (ttext t <+> ttext a) <> "}"
-    prettyPrec p (LamF bs e) = maybeParens (p>0) $
-        hsep ["λ", hsep (prettyPrec appPrec1 <$> bs), "->", pretty e]
-    prettyPrec p (LetF r bs e) = maybeParens (p>0)
-                               $ hsep [pretty r, explicitLayout bs]
-                             $+$ hsep ["in", pretty e]
-    prettyPrec p (AppF f x) = maybeParens (p>appPrec) $
-        prettyPrec appPrec f <+> prettyPrec appPrec1 x
-    prettyPrec p (LitF l) = prettyPrec p l
-    prettyPrec p (CaseF e as) = maybeParens (p>0) $
+instance (Pretty b) => Pretty (Expr b) where
+    prettyPrec _ (Var n)      = ttext n
+    prettyPrec _ (Con t a)    = "Pack{" <> (ttext t <+> ttext a) <> "}"
+    prettyPrec _ (Lam bs e)   = hsep ["λ", hsep (prettyPrec 1 <$> bs), "->", pretty e]
+    prettyPrec _ (Let r bs e) = hsep [word, explicitLayout bs]
+                            $+$ hsep ["in", pretty e]
+        where word = if r == Rec then "letrec" else "let"
+    prettyPrec p (App f x)    = maybeParens (p>0) $
+        prettyPrec 0 f <+> prettyPrec 1 x
+    prettyPrec _ (Lit l)      = pretty l
+    prettyPrec p (Case e as)  = maybeParens (p>0) $
         "case" <+> pretty e <+> "of"
         $+$ nest 2 (explicitLayout as)
-    prettyPrec p (TypeF t) = "@" <> prettyPrec appPrec1 t
 
-instance Pretty Rec where
-    pretty Rec = "letrec"
-    pretty NonRec = "let"
-
-instance (Pretty b, Pretty a) => Pretty (AlterF b a) where
-    pretty (AlterF c as e) =
+instance (Pretty b) => Pretty (Alter b) where
+    pretty (Alter c as e) =
         hsep [pretty c, hsep (pretty <$> as), "->", pretty e]
 
 instance Pretty AltCon where
     pretty (AltData n) = ttext n
     pretty (AltLit l) = pretty l
-    pretty (AltTag t) = "<" <> ttext t <> ">"
+    pretty (AltTag t) = ttext t
     pretty AltDefault = "_"
 
 instance Pretty Lit where
     pretty (IntL n) = ttext n
 
-instance (Pretty b, Pretty a) => Pretty (BindingF b a) where
-    pretty (BindingF k v) = hsep [pretty k, "=", pretty v]
+instance (Pretty b) => Pretty (Binding b) where
+    pretty (k := v) = hsep [pretty k, "=", pretty v]
 
 explicitLayout :: (Pretty a) => [a] -> Doc
 explicitLayout as = vcat inner <+> "}" where
     inner = zipWith (<+>) delims (pretty <$> as)
     delims = "{" : repeat ";"
 
-instance Pretty Var where
-    prettyPrec p (MkVar n t) = maybeParens (p>0) $
-        hsep [pretty n, ":", pretty t]
-
---------------------------------------------------------------------------------
-
--- instance Functor Alter where
---     fmap f (Alter con bs e) = Alter con (f <$> bs) e'
---         where
---             e' = foldFix (embed . bimap' f id) e
---             bimap' = $(makeBimap ''ExprF)
-
--- instance Foldable Alter where
--- instance Traversable Alter where
--- instance Functor Binding where
--- instance Foldable Binding where
--- instance Traversable Binding where
-
-liftShowsPrecExpr :: (Show b)
-                  => (Int -> a -> ShowS)
-                  -> ([a] -> ShowS)
-                  -> Int -> ExprF b a -> ShowS
-liftShowsPrecExpr = $(makeLiftShowsPrec ''ExprF)
-
-showsPrec1Expr :: (Show b, Show a)
-               => Int -> ExprF b a -> ShowS
-showsPrec1Expr = $(makeShowsPrec1 ''ExprF)
-
-instance (Show b) => Show1 (AlterF b) where
-    liftShowsPrec sp spl d (AlterF con bs e) =
-        showsTernaryWith showsPrec showsPrec (liftShowsPrecExpr sp spl)
-                         "AlterF" d con bs e
-
-instance (Show b) => Show1 (BindingF b) where
-    liftShowsPrec sp spl d (BindingF k v) =
-        showsBinaryWith showsPrec (liftShowsPrecExpr sp spl)
-                        "BindingF" d k v
-
-instance (Show b, Show a) => Show (BindingF b a) where
-    showsPrec d (BindingF k v)
-        = showParen (d > 10)
-        $ showString "BindingF" . showChar ' '
-        . showsPrec 11 k . showChar ' '
-        . showsPrec1Expr 11 v
-
-instance (Show b, Show a) => Show (AlterF b a) where
-    showsPrec d (AlterF con bs e)
-        = showParen (d > 10)
-        $ showString "AlterF" . showChar ' '
-        . showsPrec 11 con . showChar ' '
-        . showsPrec 11 bs . showChar ' '
-        . showsPrec1Expr 11 e
-
-deriveShow1 ''ExprF
-
-deriving instance (Show b, Show a) => Show (ExprF b a)
--- deriving instance (Show b, Show a) => Show (BindingF b a)
--- deriving instance (Show b, Show a) => Show (AlterF b a)
-deriving instance Show b => Show (ScDef b)
-deriving instance Show b => Show (Program b)
-
-bimapExpr :: (b -> b') -> (a -> a')
-          -> ExprF b a -> ExprF b' a'
-bimapExpr = $(makeBimap ''ExprF)
-
-bifoldrExpr :: (b -> c -> c)
-            -> (a -> c -> c)
-            -> c -> ExprF b a -> c
-bifoldrExpr = $(makeBifoldr ''ExprF)
-
-bitraverseExpr :: Applicative f
-               => (b -> f b')
-               -> (a -> f a')
-               -> ExprF b a -> f (ExprF b' a')
-bitraverseExpr = $(makeBitraverse ''ExprF)
-
-instance Bifunctor AlterF where
-    bimap f g (AlterF con bs e) = AlterF con (f <$> bs) (bimapExpr f g e)
-
-instance Bifunctor BindingF where
-    bimap f g (BindingF k v) = BindingF (f k) (bimapExpr f g v)
-
-instance Bifoldable AlterF where
-    bifoldr f g z (AlterF con bs e) = bifoldrExpr f g z' e where
-        z' = foldr f z bs
-
-instance Bitraversable AlterF where
-    bitraverse f g (AlterF con bs e) =
-        AlterF con <$> traverse f bs <*> bitraverseExpr f g e
-
-instance Bifoldable BindingF where
-    bifoldr f g z (BindingF k v) = bifoldrExpr f g (f k z) v
-
-instance Bitraversable BindingF where
-    bitraverse f g (BindingF k v) =
-        BindingF <$> f k <*> bitraverseExpr f g v
-
-deriveBifunctor ''ExprF
-deriveBifoldable ''ExprF
-deriveBitraversable ''ExprF
-
-instance Lift b => Lift1 (ExprF b) where
-    lift1 (VarF k)      = liftCon 'VarF (lift k)
-    lift1 (AppF f x)    = liftCon2 'AppF (lift f) (lift x)
-    lift1 (LamF b e)    = liftCon2 'LamF (lift b) (lift e)
-    lift1 (LetF r bs e) = liftCon3 'LetF (lift r) (lift bs) (lift e)
-    lift1 (CaseF e as)  = liftCon2 'CaseF (lift e) (lift as)
-    lift1 (TypeF t)     = liftCon 'TypeF (lift t)
-    lift1 (LitF l)      = liftCon 'LitF (lift l)
-    lift1 (ConF t a)    = liftCon2 'ConF (lift t) (lift a)
-
-deriving instance (Lift b, Lift a) => Lift (ExprF b a)
-deriving instance (Lift b, Lift a) => Lift (BindingF b a)
-deriving instance (Lift b, Lift a) => Lift (AlterF b a)
-deriving instance Lift b => Lift (ScDef b)
-deriving instance Lift b => Lift (Program b)
-
---------------------------------------------------------------------------------
-
-class HasApplicants1 s t a b | s -> a, t -> b, s b -> t, t a -> s where
-    applicants1 :: Traversal s t a b
-
-class HasApplicants s t a b | s -> a, t -> b, s b -> t, t a -> s where
-    applicants :: Traversal s t a b
-
-instance HasApplicants1 Type Type Type Type where
-    applicants1 k (TyApp f x) = TyApp <$> applicants1 k f <*> k x
-    applicants1 k x           = k x
-
-instance HasApplicants Type Type Type Type where
-    applicants k (TyApp f x) = TyApp <$> applicants k f <*> k x
-    applicants k x           = pure x
-
--- instance HasArguments (ExprF b (Fix (ExprF b))) (ExprF b (Fix (ExprF b)))
---                        (Fix (ExprF b)) (Fix (ExprF b)) where
---     arguments k (AppF f x) = AppF <$> arguments k f <*> k x
---     arguments k x          = unwrapFix <$> k (wrapFix x)
-
--- instance HasArguments (f (Fix f)) (f (Fix f)) (Fix f) (Fix f)
---       => HasArguments (Fix f) (Fix f) (Fix f) (Fix f) where
---     arguments :: forall g. Applicative g
---                => LensLike' g (Fix f) (Fix f)
---     arguments k (Fix f) = Fix <$> arguments k f
-
--- arguments :: Traversal' (Expr b) (Expr b)
--- arguments k (App f x) = App <$> arguments k f <*> k x
--- arguments k x         = k x
-
-class HasBinders s t a b | s -> a, t -> b, s b -> t, t a -> s where
-    binders :: Traversal s t a b
-
-instance HasBinders (ScDef b) (ScDef b') b b' where
-    binders k (ScDef b as e) = ScDef <$> k b <*> traverse k as <*> binders k e
-
-instance (Hashable b, Hashable b')
-      => HasBinders (Program b) (Program b') b b' where
-    binders :: forall f. (Applicative f)
-            => LensLike f (Program b) (Program b') b b'
-    binders k p
-        = Program
-        <$> traverse (binders k) (_programScDefs p)
-        <*> (getAp . ifoldMap toSingleton $ _programTypeSigs p)
-        <*> pure (_programDataTags p)
-      where
-        toSingleton :: b -> Type -> Ap f (HashMap b' Type)
-        toSingleton b t = Ap $ (`H.singleton` t) <$> k b
-
-instance HasBinders a a' b b'
-    => HasBinders (ExprF b a) (ExprF b' a') b b' where
-    binders :: forall f. (Applicative f)
-                    => LensLike f (ExprF b a) (ExprF b' a') b b'
-    binders k = go where
-        go :: ExprF b a -> f (ExprF b' a')
-        go (LamF bs e)   = LamF <$> traverse k bs <*> binders k e
-        go (CaseF e as)  = CaseF <$> binders k e <*> eachbind as
-        go (LetF r bs e) = LetF r <$> eachbind bs <*> binders k e
-        go f             = bitraverse k (binders k) f
-
-        eachbind :: forall p. Bitraversable p => [p b a] -> f [p b' a']
-        eachbind bs = bitraverse k (binders k) `traverse` bs
-
-instance HasBinders a a b b'
-      => HasBinders (AlterF b a) (AlterF b' a) b b' where
-    binders k (AlterF con bs e) =
-        AlterF con <$> traverse k bs <*> traverseOf binders k e
-
-instance HasBinders a a b b'
-      => HasBinders (BindingF b a) (BindingF b' a) b b' where
-    binders k (BindingF b v) = BindingF <$> k b <*> binders k v
-
-instance (HasBinders (f b (Fix (f b))) (f b' (Fix (f b'))) b b')
-      => HasBinders (Fix (f b)) (Fix (f b')) b b' where
-    binders k (Fix f) = Fix <$> binders k f
-
-class HasArrowStops s t a b | s -> a, t -> b, s b -> t, t a -> s where
-    arrowStops :: Traversal s t a b
-
-instance HasArrowStops Type Type Type Type where
-    arrowStops k (s :-> t) = (:->) <$> k s <*> arrowStops k t
-    arrowStops k t = k t
-
---------------------------------------------------------------------------------
-
-liftEqExpr :: (Eq b)
-           => (a -> a' -> Bool)
-           -> ExprF b a -> ExprF b a' -> Bool
-liftEqExpr = $(makeLiftEq ''ExprF)
-
-instance (Eq b, Eq a) => Eq (BindingF b a) where
-    BindingF ka va == BindingF kb vb =
-        ka == kb && va `eq` vb
-      where eq = liftEqExpr (==)
-
-instance (Eq b, Eq a) => Eq (AlterF b a) where
-    AlterF cona bsa ea == AlterF conb bsb eb =
-        cona == conb && bsa == bsb && ea `eq` eb
-      where eq = liftEqExpr (==)
-
-instance (Eq b) => Eq1 (AlterF b) where
-    liftEq f (AlterF cona bsa ea) (AlterF conb bsb eb) =
-        cona == conb && bsa == bsb && ea `eq` eb
-      where eq = liftEqExpr f
-
-instance (Eq b) => Eq1 (BindingF b) where
-    liftEq f (BindingF ka va) (BindingF kb vb) =
-        ka == kb && va `eq` vb
-      where eq = liftEqExpr f
-
-deriveEq1 ''ExprF
-
-deriving instance (Eq b, Eq a) => Eq (ExprF b a)
-
-makePrisms ''BindingF
-makePrisms ''Var
-

src/Core/SystemF.hs

@@ -1,235 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-{-# LANGUAGE OverloadedLists #-}
-module Core.SystemF
-    ( lintCoreProgR
-    )
-    where
---------------------------------------------------------------------------------
-import GHC.Generics                 (Generic, Generically(..))
-import Data.HashMap.Strict          (HashMap)
-import Data.HashMap.Strict          qualified as H
-import Data.Function                (on)
-import Data.Traversable
-import Data.Foldable
-import Data.List.Extra
-import Control.Monad.Utils
-import Control.Monad
-import Data.Text                    qualified as T
-import Data.Pretty
-import Text.Printf
-
-import Control.Comonad
-import Control.Comonad.Cofree
-import Data.Fix
-import Data.Functor
-
-import Control.Lens                 hiding ((:<))
-import Control.Lens.Unsound
-
-import Compiler.RLPC
-import Compiler.RlpcError
-import Core
---------------------------------------------------------------------------------
-
-data Gamma = Gamma
-    { _gammaVars   :: HashMap Name Type
-    , _gammaTyVars :: HashMap Name Kind
-    , _gammaTyCons :: HashMap Name Kind
-    }
-    deriving (Generic)
-    deriving (Semigroup, Monoid)
-        via (Generically Gamma)
-
-makeLenses ''Gamma
-
-lintCoreProgR :: (Monad m) => Program Var -> RLPCT m (Program Name)
-lintCoreProgR = undefined
-
-lint :: Program Var -> Program Name
-lint = undefined
-
-type ET = Cofree (ExprF Var) Type
-
-type SysF = Either SystemFError
-
-data SystemFError = SystemFErrorUndefinedVariable Name
-                  | SystemFErrorKindMismatch Kind Kind
-                  | SystemFErrorCouldNotMatch Type Type
-                  deriving Show
-
-instance IsRlpcError SystemFError where
-    liftRlpcError = \case
-        SystemFErrorUndefinedVariable n ->
-            undefinedVariableErr n
-        SystemFErrorKindMismatch k k' ->
-            Text [ T.pack $ printf "Could not match kind `%s' with `%s'"
-                                   (pretty k) (pretty k')
-                 ]
-        SystemFErrorCouldNotMatch t t' ->
-            Text [ T.pack $ printf "Could not match type `%s' with `%s'"
-                                   (pretty t) (pretty t')
-                 ]
-
-justLintCoreExpr = fmap (fmap (prettyPrec appPrec1)) . lintE demoContext
-
-lintE :: Gamma -> Expr Var -> SysF ET
-lintE g = \case
-    Var n -> lookupVar g n <&> (:< VarF n)
-    Lit (IntL n) -> pure $ TyInt :< LitF (IntL n)
-
-    Type t -> kindOf g t <&> (:< TypeF t)
-
-    App f x
-        -- type application
-        | Right (TyForall (a :^ k) m :< f') <- lintE g f
-        , Right (k' :< TypeF t) <- lintE g x
-        , k == k'
-        -> pure $ subst a t m :< f'
-
-        -- value application
-        | Right fw@((s :-> t) :< _) <- lintE g f
-        , Right xw@(s' :< _) <- lintE g x
-        , s == s'
-        -> pure $ t :< AppF fw xw
-
-    Lam bs e -> do
-        e'@(t :< _) <- lintE g' e
-        pure $ foldr arrowify t bs :< LamF bs e'
-      where
-        g' = foldMap suppl bs <> g
-
-        suppl (MkVar n t)
-            | isKind t  = mempty & gammaTyVars %~ H.insert n t
-            | otherwise = mempty & gammaVars %~ H.insert n t
-
-        arrowify (MkVar n s) s'
-            | isKind s  = TyForall (n :^ s) s'
-            | otherwise = s :-> s'
-
-    Let Rec bs e -> do
-        e'@(t :< _) <- lintE g' e
-        bs' <- (uncurry checkBind . (_2 %~ wrapFix)) `traverse` binds
-        pure $ t :< LetF Rec bs' e'
-      where
-        binds = bs ^.. each . _BindingF
-        vs = binds ^.. each . _1 . _MkVar
-        g' = supplementVars vs g
-        checkBind v@(MkVar n t) e = case lintE g' e of
-            Right (t' :< e') | t == t'   -> Right (BindingF v e')
-                             | otherwise -> Left (SystemFErrorCouldNotMatch t t')
-            Left e -> Left e
-    Let NonRec bs e -> do
-        (g',bs') <- mapAccumLM checkBind g bs
-        e'@(t :< _) <- lintE g' e
-        pure $ t :< LetF NonRec bs' e'
-      where
-        checkBind :: Gamma -> BindingF Var (Expr Var)
-                  -> SysF (Gamma, BindingF Var ET)
-        checkBind g (BindingF v@(n :^ t) e) = case lintE g (wrapFix e) of
-            Right (t' :< e')
-                | t == t'   -> Right (supplementVar n t g, BindingF v e')
-                | otherwise -> Left (SystemFErrorCouldNotMatch t t')
-            Left e -> Left e
-
-    Case e as -> do
-        e'@(et :< _) <- lintE g e
-        (ts,as') <- unzip <$> checkAlt et `traverse` as
-        case allUnify ts of
-            Just err -> Left err
-            Nothing  -> pure $ head ts  :< CaseF e' as'
-      where
-        checkAlt :: Type -> Alter Var -> SysF (Type, AlterF Var ET)
-        checkAlt scrutineeType (AlterF (AltData con) bs e) = do
-            ct <- lookupVar g con
-            ct' <- foldrMOf applicants (elimForall g) ct scrutineeType
-            zipWithM_ fzip bs (ct' ^.. arrowStops)
-            (t :< e') <- lintE (supplementVars (varsToPairs bs) g) (wrapFix e)
-            pure (t, AlterF (AltData con) bs e')
-          where
-            fzip (MkVar _ t) t'
-                | t == t'   = Right ()
-                | otherwise = Left (SystemFErrorCouldNotMatch t t')
-
-allUnify :: [Type] -> Maybe SystemFError
-allUnify [] = Nothing
-allUnify [t] = Nothing
-allUnify (t:t':ts)
-    | t == t'   = allUnify ts
-    | otherwise = Just (SystemFErrorCouldNotMatch t t')
-
-elimForall :: Gamma -> Type -> Type -> SysF Type
-elimForall g t (TyForall (n :^ k) m) = do
-    k' <- kindOf g t
-    case k == k' of
-        True -> pure $ subst n t m
-        False -> Left $ SystemFErrorKindMismatch k k'
-elimForall _ m _ = pure m
- 
-varsToPairs :: [Var] -> [(Name, Type)]
-varsToPairs = toListOf (each . _MkVar)
-
-checkAgainst :: Gamma -> Var -> Expr Var -> SysF ET
-checkAgainst g v@(MkVar n t) e = case lintE g e of
-    Right e'@(t' :< _) | t == t'      -> Right e'
-                       | otherwise    -> Left (SystemFErrorCouldNotMatch t t')
-    Left a -> Left a
-
-supplementVars :: [(Name, Type)] -> Gamma -> Gamma
-supplementVars vs = gammaVars <>~ H.fromList vs
-
-supplementVar :: Name -> Type -> Gamma -> Gamma
-supplementVar n t = gammaVars %~ H.insert n t
-
-supplementTyVar :: Name -> Kind -> Gamma -> Gamma
-supplementTyVar n t = gammaTyVars %~ H.insert n t
-
-subst :: Name -> Type -> Type -> Type
-subst k v (TyVar n) | k == n = v
-subst k v (TyForall (MkVar n k') t)
-    | k /= n                 = TyForall (MkVar n k') (subst k v t)
-    | otherwise              = TyForall (MkVar n k') t
-subst k v (TyApp f x)        = (TyApp `on` subst k v) f x
-subst _ _ x                  = x
-
-isKind :: Type -> Bool
-isKind (s :-> t)  = isKind s && isKind t
-isKind TyKindType = True
-isKind _          = False
-
-kindOf :: Gamma -> Type -> SysF Kind
-kindOf g (TyVar n)  = lookupTyVar g n
-kindOf _ TyKindType = pure TyKindType
-kindOf g (TyCon n)  = lookupCon g n
-kindOf _ e          = error (show e)
-
-lookupCon :: Gamma -> Name -> SysF Kind
-lookupCon g n = case g ^. gammaTyCons . at n of
-    Just k  -> Right k
-    Nothing -> Left (SystemFErrorUndefinedVariable n)
-
-lookupVar :: Gamma -> Name -> SysF Type
-lookupVar g n = case g ^. gammaVars . at n of
-    Just t -> Right t
-    Nothing -> Left (SystemFErrorUndefinedVariable n)
-
-lookupTyVar :: Gamma -> Name -> SysF Kind
-lookupTyVar g n = case g ^. gammaTyVars . at n of
-    Just k -> Right k
-    Nothing -> Left (SystemFErrorUndefinedVariable n)
-
-demoContext :: Gamma
-demoContext = Gamma
-    { _gammaVars =
-        [ ("id", TyForall ("a" :^ TyKindType) $ TyVar "a" :-> TyVar "a")
-        , ("Just", TyForall ("a" :^ TyKindType) $
-            TyVar "a" :-> (TyCon "Maybe" `TyApp` TyVar "a"))
-        , ("Nothing", TyForall ("a" :^ TyKindType) $
-            TyCon "Maybe" `TyApp` TyVar "a")
-        ]
-    , _gammaTyVars = []
-    , _gammaTyCons =
-        [ ("Int#", TyKindType)
-        , ("Maybe", TyKindType :-> TyKindType)
-        ]
-    }
-

src/Core/TH.hs

@@ -5,8 +5,8 @@ Description : Core quasiquoters
 module Core.TH
     ( coreExpr
     , coreProg
-    -- , coreExprT
-    -- , coreProgT
+    , coreExprT
+    , coreProgT
     )
     where
 ----------------------------------------------------------------------------------
@@ -33,18 +33,16 @@ coreExpr :: QuasiQuoter
 coreExpr = mkqq $ lexCoreR >=> parseCoreExprR
 
 -- | Type-checked @coreProg@
--- coreProgT :: QuasiQuoter
--- coreProgT = mkqq $ lexCoreR >=> parseCoreProgR >=> checkCoreProgR
+coreProgT :: QuasiQuoter
+coreProgT = mkqq $ lexCoreR >=> parseCoreProgR >=> checkCoreProgR
 
--- coreExprT :: QuasiQuoter
--- coreExprT = mkqq $ lexCoreR >=> parseCoreExprR >=> checkCoreExprR g
---     where
---         g = [ ("+#", TyInt :-> TyInt :-> TyInt)
---             , ("id", TyForall (MkVar "a" TyKindType) $
---                     TyVar "a" :-> TyVar "a")
---             , ("fix", TyForall (MkVar "a" TyKindType) $
---                     (TyVar "a" :-> TyVar "a") :-> TyVar "a")
---             ]
+coreExprT :: QuasiQuoter
+coreExprT = mkqq $ lexCoreR >=> parseCoreExprR >=> checkCoreExprR g
+    where
+        g = [ ("+#", TyCon "Int#" :-> TyCon "Int#" :-> TyCon "Int#")
+            , ("id", TyCon "a" :-> TyCon "a")
+            , ("fix", (TyCon "a" :-> TyCon "a") :-> TyCon "a")
+            ]
 
 mkqq :: (Lift a) => (Text -> RLPCIO a) -> QuasiQuoter
 mkqq p = QuasiQuoter

src/Core/Utils.hs

@@ -2,6 +2,8 @@ module Core.Utils
     ( programRhss
     , programGlobals
     , isAtomic
+    -- , insertModule
+    , extractProgram
     , freeVariables
     )
     where
@@ -11,7 +13,7 @@ import Data.Functor.Foldable
 import Data.Set                     (Set)
 import Data.Set                     qualified as S
 import Core.Syntax
-import Control.Lens
+import Lens.Micro
 import GHC.Exts                     (IsList(..))
 ----------------------------------------------------------------------------------
 
@@ -28,29 +30,34 @@ isAtomic _        = False
 
 ----------------------------------------------------------------------------------
 
-freeVariables :: Expr b -> Set b
-freeVariables = undefined
+-- TODO: export list awareness
+-- insertModule :: Module b -> Program b -> Program b
+-- insertModule (Module _ p) = programScDefs %~ (<>m)
 
--- freeVariables :: Expr' -> Set Name
--- freeVariables = cata go
---     where
---         go :: ExprF Name (Set Name) -> Set Name
---         go (VarF k)         = S.singleton k
---         -- TODO: collect free vars in rhss of bs
---         go (LetF _ bs e)    = (e `S.union` esFree) `S.difference` ns
---             where
---                 es = bs ^.. each . _rhs :: [Expr']
---                 ns = S.fromList $ bs ^.. each . _lhs
---                 -- TODO: this feels a little wrong. maybe a different scheme is
---                 -- appropriate
---                 esFree = foldMap id $ freeVariables <$> es
+extractProgram :: Module b -> Program b
+extractProgram (Module _ p) = p
 
---         go (CaseF e as)     = e `S.union` asFree
---             where
---                 -- asFree = foldMap id $ freeVariables <$> (fmap altToLam as)
---                 asFree = foldMap (freeVariables . altToLam) as
---                 -- we map alts to lambdas to avoid writing a 'freeVariablesAlt'
---                 altToLam (Alter _ ns e) = Lam ns e
---         go (LamF bs e)      = e `S.difference` (S.fromList bs)
---         go e                = foldMap id e
+----------------------------------------------------------------------------------
+
+freeVariables :: Expr' -> Set Name
+freeVariables = cata go
+    where
+        go :: ExprF Name (Set Name) -> Set Name
+        go (VarF k)         = S.singleton k
+        -- TODO: collect free vars in rhss of bs
+        go (LetF _ bs e)    = (e `S.union` esFree) `S.difference` ns
+            where
+                es = bs ^.. each . _rhs :: [Expr']
+                ns = S.fromList $ bs ^.. each . _lhs
+                -- TODO: this feels a little wrong. maybe a different scheme is
+                -- appropriate
+                esFree = foldMap id $ freeVariables <$> es
+
+        go (CaseF e as)     = e `S.union` asFree
+            where
+                asFree = foldMap id $ freeVariables <$> (fmap altToLam as)
+                -- we map alts to lambdas to avoid writing a 'freeVariablesAlt'
+                altToLam (Alter _ ns e) = Lam ns e
+        go (LamF bs e)      = e `S.difference` (S.fromList bs)
+        go e                = foldMap id e
 

src/Core2Core.hs

@@ -20,10 +20,12 @@ import Control.Monad.State.Lazy
 import Control.Arrow            ((>>>))
 import Data.Text                qualified as T
 import Data.HashMap.Strict      (HashMap)
+import Debug.Trace
 import Numeric                  (showHex)
 
 import Data.Pretty
 import Compiler.RLPC
+-- import Lens.Micro.Platform
 import Control.Lens
 import Core.Syntax
 import Core.Utils
@@ -116,7 +118,7 @@ floatNonStrictCases g = goE
             goE e
             traverse_ goE altBodies
             pure e'
-        goC (App f x)           = App <$> goC f <*> goC x
+        goC (f :$ x)            = (:$) <$> goC f <*> goC x
         goC (Let r bs e)        = Let r <$> bs' <*> goE e
             where bs' = travBs goC bs
         goC (Lit l)             = pure (Lit l)
@@ -128,9 +130,10 @@ floatNonStrictCases g = goE
         -- extract the right-hand sides of a list of bindings, traverse each
         -- one, and return the original list of bindings
         travBs :: (Expr' -> Floater Expr') -> [Binding'] -> Floater [Binding']
-        travBs c bs = undefined
+        travBs c bs = bs ^.. each . _rhs
+                    & traverse goC
+                    & const (pure bs)
         -- ^ ??? what the fuck?
-        -- ^ 24/02/22: what is this shit lol?
 
 -- when provided with a case expr, floatCase will float the case into a
 -- supercombinator of its free variables. the sc is returned along with an

src/Data/Heap.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE ImplicitParams #-}
 {-
 Module : Data.Heap
 Description : A model heap used by abstract machine
@@ -26,7 +27,10 @@ import Data.Map                     (Map, (!?))
 import Debug.Trace
 import Data.Map.Strict              qualified as M
 import Data.List                    (intersect)
-import GHC.Stack                    (HasCallStack)
+import Data.IORef
+import System.IO.Unsafe
+import Control.Monad
+import GHC.Stack
 import Control.Lens
 ----------------------------------------------------------------------------------
 
@@ -74,13 +78,19 @@ instance Traversable Heap where
 
 ----------------------------------------------------------------------------------
 
-alloc :: Heap a -> a -> (Heap a, Addr)
-alloc (Heap (u:us) m) v = (Heap us (M.insert u v m), u)
+godhelpme :: IORef Int
+godhelpme = unsafePerformIO $ newIORef 0
+
+alloc :: HasCallStack => Heap a -> a -> (Heap a, Addr)
+alloc (Heap (u:us) m) v = unsafePerformIO $ do
+    -- i <- readIORef godhelpme
+    -- when (i >= 60000) $ error "fuck"
+    -- modifyIORef godhelpme succ
+    pure (Heap us (M.insert u v m), u)
 alloc (Heap [] _)     _ = error "heap model ran out of memory..."
 
-update :: Addr -> a -> Heap a -> Heap a
+update :: HasCallStack => Addr -> a -> Heap a -> Heap a
 update k v (Heap u m) = Heap u (M.adjust (const v) k m)
--- update k v (Heap u m) = Heap u (M.adjust (undefined) k m)
 
 adjust :: Addr -> (a -> a) -> Heap a -> Heap a
 adjust k f (Heap u m) = Heap u (M.adjust f k m)

src/Data/Pretty.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE QuantifiedConstraints #-}
 module Data.Pretty
     ( Pretty(..)
     , rpretty
@@ -7,11 +6,8 @@ module Data.Pretty
     , hsepOf, vsepOf
     , vcatOf
     , vlinesOf
-    , vsepTerm
     , module Text.PrettyPrint
     , maybeParens
-    , appPrec
-    , appPrec1
     )
     where
 ----------------------------------------------------------------------------------
@@ -19,13 +15,10 @@ import Text.PrettyPrint             hiding ((<>))
 import Text.PrettyPrint.HughesPJ    hiding ((<>))
 import Text.Printf
 import Data.String                  (IsString(..))
-import Data.Text.Lens               hiding ((:<))
+import Data.Text.Lens
 import Data.Monoid
-import Control.Lens
-
--- instances
-import Control.Comonad.Cofree
 import Data.Text                    qualified as T
+import Control.Lens
 ----------------------------------------------------------------------------------
 
 class Pretty a where
@@ -34,7 +27,7 @@ class Pretty a where
 
     {-# MINIMAL pretty | prettyPrec #-}
     pretty = prettyPrec 0
-    prettyPrec = const pretty
+    prettyPrec a _ = pretty a
 
 rpretty :: (IsString s, Pretty a) => a -> s
 rpretty = fromString . render . pretty
@@ -52,9 +45,6 @@ instance (Show a) => Pretty (Showing a) where
 
 deriving via Showing Int instance Pretty Int
 
-class (forall a. Pretty a => Pretty (f a)) => Pretty1 f where
-    liftPrettyPrec :: (Int -> a -> Doc) -> f a -> Doc
-
 --------------------------------------------------------------------------------
 
 ttext :: Pretty t => t -> Doc
@@ -73,19 +63,3 @@ vlinesOf :: Getting (Endo Doc) s Doc -> s -> Doc
 vlinesOf l = foldrOf l (\a b -> a $+$ "" $+$ b) mempty
 -- hack(?) to separate chunks with a blankline
 
-vsepTerm :: Doc -> Doc -> Doc -> Doc
-vsepTerm term a b = (a <> term) $+$ b
-
---------------------------------------------------------------------------------
-
-appPrec, appPrec1 :: Int
-appPrec  = 10
-appPrec1 = 11
-
-instance PrintfArg Doc where
-    formatArg d fmt
-        | fmtChar (vFmt 'D' fmt) == 'D' = formatString (render d) fmt'
-        | otherwise                     = errorBadFormat $ fmtChar fmt
-      where
-        fmt' = fmt { fmtChar = 's', fmtPrecision = Nothing }
-

src/GM.hs

@@ -9,12 +9,8 @@ module GM
     ( hdbgProg
     , evalProg
     , evalProgR
-    , GmState(..)
-    , gmCode, gmStack, gmDump, gmHeap, gmEnv, gmStats
     , Node(..)
-    , showState
     , gmEvalProg
-    , Stats(..)
     , finalStateOf
     , resultOf
     , resultOfExpr
@@ -26,13 +22,18 @@ import Data.List                    (mapAccumL)
 import Data.Maybe                   (fromMaybe, mapMaybe)
 import Data.Monoid                  (Endo(..))
 import Data.Tuple                   (swap)
-import Control.Lens
-import Data.Text.Lens               (IsText, packed, unpacked)
+import Lens.Micro
+import Lens.Micro.Extras            (view)
+import Lens.Micro.TH
+import Lens.Micro.Platform          (packed, unpacked)
+import Lens.Micro.Platform.Internal (IsText(..))
 import Text.Printf
 import Text.PrettyPrint             hiding ((<>))
 import Text.PrettyPrint.HughesPJ    (maybeParens)
 import Data.Foldable                (traverse_)
-import System.IO                    (Handle, hPutStrLn)
+import Control.Concurrent
+import System.Exit
+import System.IO                    (Handle, hPutStrLn, stderr)
 -- TODO: an actual output system
 -- TODO: an actual output system
 -- TODO: an actual output system
@@ -90,7 +91,6 @@ data Key = NameKey Name
          | ConstrKey Tag Int
          deriving (Show, Eq)
 
--- >> [ref/Instr]
 data Instr = Unwind
            | PushGlobal Name
            | PushConstr Tag Int
@@ -112,7 +112,6 @@ data Instr = Unwind
            | Print
            | Halt
            deriving (Show, Eq)
--- << [ref/Instr]
 
 data Node = NNum Int
           | NAp Addr Addr
@@ -155,7 +154,7 @@ evalProg p = res <&> (,sts)
         resAddr = final ^. gmStack ^? _head
         res = resAddr >>= flip hLookup h
 
-hdbgProg :: Program' -> Handle -> IO GmState
+hdbgProg :: Program' -> Handle -> IO (Node, Stats)
 hdbgProg p hio = do
     (renderOut . showState) `traverse_` states
     -- TODO: i'd like the statistics to be at the top of the file, but `sts`
@@ -163,7 +162,7 @@ hdbgProg p hio = do
     -- *can't* get partial logs in the case of a crash. this is in opposition to
     -- the above traversal which *will* produce partial logs. i love laziness :3
     renderOut . showStats $ sts
-    pure final
+    pure (res, sts)
     where
         renderOut r = hPutStrLn hio $ render r ++ "\n"
 
@@ -176,8 +175,11 @@ hdbgProg p hio = do
         [resAddr] = final ^. gmStack
         res = hLookupUnsafe resAddr h
 
-evalProgR :: (Monad m) => Program' -> RLPCT m (Node, Stats)
+evalProgR :: Program' -> RLPCIO (Node, Stats)
 evalProgR p = do
+    -- me <- liftIO myThreadId
+    -- liftIO $ forkIO $ threadDelay (5 * 10^6) *> throwTo me ExitSuccess *> exitSuccess
+    -- states & traverseOf_ (each . gmCode) (liftIO . print)
     (renderOut . showState) `traverse_` states
     renderOut . showStats $ sts
     pure (res, sts)
@@ -196,11 +198,11 @@ eval st = st : rest
     where
         rest | isFinal st   = []
              | otherwise    = eval next
-        next = doAdmin (step st)
+        next = doAdmin (step . (\a -> (unsafePerformIO . hPutStrLn stderr . ('\n':) . render . showState $ a) `seq` a) $ st)
 
 doAdmin :: GmState -> GmState
 doAdmin st = st & gmStats . stsReductions %~ succ
-                & doGC
+                -- & doGC
     where
         -- TODO: use heapTrigger option in RLPCOptions
         heapTrigger = 50
@@ -410,7 +412,8 @@ step st = case head (st ^. gmCode) of
                 (e:s) = st ^. gmStack
                 an = s !! n
                 h = st ^. gmHeap
-                h' = h `seq` update an (NInd e) h
+                -- PROBLEM HERE:
+                h' = update an (NInd e) h
 
         popI :: Int -> GmState
         popI n = st
@@ -645,7 +648,7 @@ compiledPrims =
     , binop "<#" Lesser
     , binop ">=#" GreaterEq
     , ("print#", 1, [ Push 0, Eval, Print, Pack tag_Unit_unit 0, Update 1, Pop 1
-                    , Unwind ])
+                    , Unwind])
     ]
     where
         unop k i = (k, 1, [Push 0, Eval, i, Update 1, Pop 1, Unwind])
@@ -659,7 +662,7 @@ buildInitialHeap (view programScDefs -> ss) = mapAccumL allocateSc mempty compil
 
         -- note that we don't count sc allocations in the stats
         allocateSc :: GmHeap -> CompiledSC -> (GmHeap, (Key, Addr))
-        allocateSc h (n,d,c) = (h', (NameKey n, a))
+        allocateSc h (n,d,c) = traceShow a (h', (NameKey n, a))
             where (h',a) = alloc h $ NGlobal d c
 
         -- >> [ref/compileSc]
@@ -746,17 +749,19 @@ buildInitialHeap (view programScDefs -> ss) = mapAccumL allocateSc mempty compil
         compileE _ (Lit l) = compileEL l
         compileE g (Let NonRec bs e) =
                 -- we use compileE instead of compileC
-                mconcat binders <> compileE g' e <> [Slide d]
+                traceShowId $ mconcat binders <> compileE g' e <> [Slide d]
             where
                 d = length bs
-                (g',binders) = mapAccumL compileBinder g bs
+                (g',binders) = mapAccumL compileBinder (argOffset (d-1) g) addressed
+                -- kinda gross. revisit this
+                addressed = bs `zip` reverse [0 .. d-1]
 
-                compileBinder :: Env -> Binding' -> (Env, Code)
-                compileBinder m (k := v) = (m',c)
+                compileBinder :: Env -> (Binding', Int) -> (Env, Code)
+                compileBinder m (k := v, a) = (m',c)
                     where
-                        m' = (NameKey k, 0) : argOffset 1 m
+                        m' = (NameKey k, a) : m
                         -- make note that we use m rather than m'!
-                        c = compileC m v
+                        c = trace (printf "compileC %s %s" (show m) (show v)) $ compileC m v
 
         compileE g (Let Rec bs e) =
                 Alloc d : initialisers <> body <> [Slide d]
@@ -783,7 +788,6 @@ buildInitialHeap (view programScDefs -> ss) = mapAccumL allocateSc mempty compil
         compileE g ("/#" :$ a :$ b)  = inlineOp2 g Div    a b
         compileE g ("==#" :$ a :$ b) = inlineOp2 g Equals a b
         compileE g ("<#" :$ a :$ b)  = inlineOp2 g Lesser a b
-        compileE g (">=#" :$ a :$ b)  = inlineOp2 g GreaterEq a b
 
         compileE g (Case e as) = compileE g e <> [CaseJump (compileD g as)]
 

src/Misc.hs

@@ -1,17 +0,0 @@
-module Misc where
---------------------------------------------------------------------------------
-import Data.Functor.Classes
---------------------------------------------------------------------------------
-
-
-showsTernaryWith :: (Int -> a -> ShowS)
-                 -> (Int -> b -> ShowS)
-                 -> (Int -> c -> ShowS)
-                 -> String -> Int -> a -> b -> c -> ShowS
-showsTernaryWith sp1 sp2 sp3 name d x y z
-    = showParen (d > 10)
-    $ showString name . showChar ' '
-    . sp1 11 x . showChar ' '
-    . sp2 11 y . showChar ' '
-    . sp3 11 z
-

src/Misc/Lift1.hs

@@ -1,41 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-module Misc.Lift1
-    ( Lift1(..)
-    , liftCon, liftCon2, liftCon3
-    , Lift(..)
-    )
-    where
---------------------------------------------------------------------------------
-import Language.Haskell.TH              hiding (Type, Name)
-import Language.Haskell.TH.Syntax       hiding (Type, Name)
-import Language.Haskell.TH.Syntax       qualified as TH
-import Language.Haskell.TH.Quote
-import Data.Kind                        qualified
-import GHC.Generics
-
-import Data.Fix
---------------------------------------------------------------------------------
-
-class Lift1 (f :: Data.Kind.Type -> Data.Kind.Type) where
-    lift1 :: (Quote m, Lift t) => f t -> m Exp
-
-liftCon :: Quote m => TH.Name -> m Exp -> m Exp
-liftCon n = fmap (AppE (ConE n))
-
-liftCon2 :: Quote m => TH.Name -> m Exp -> m Exp -> m Exp
-liftCon2 n a b = do
-    a' <- a
-    b' <- b
-    pure $ ConE n `AppE` a' `AppE` b'
-
-liftCon3 :: Quote m => TH.Name -> m Exp -> m Exp -> m Exp -> m Exp
-liftCon3 n a b c = do
-    a' <- a
-    b' <- b
-    c' <- c
-    pure $ ConE n `AppE` a' `AppE` b' `AppE` c'
-
-instance Lift1 f => Lift (Fix f) where
-    lift (Fix f) = AppE (ConE 'Fix) <$> lift1 f
-
-

src/Rlp/Lex.x

@@ -8,7 +8,6 @@ module Rlp.Lex
     , Located(..)
     , lexToken
     , lexStream
-    , lexStream'
     , lexDebug
     , lexCont
     , popLexState
@@ -28,9 +27,9 @@ import Data.Text                (Text)
 import Data.Text                qualified as T
 import Data.Word
 import Data.Default
-import Control.Lens
+import Lens.Micro.Mtl
+import Lens.Micro
 
-import Compiler.Types
 import Debug.Trace
 import Rlp.Parse.Types
 }
@@ -276,12 +275,11 @@ lexCont :: (Located RlpToken -> P a) -> P a
 lexCont = (lexToken >>=)
 
 lexStream :: P [RlpToken]
-lexStream = fmap extract <$> lexStream'
-
-lexStream' :: P [Located RlpToken]
-lexStream' = lexToken >>= \case
-    t@(Located _ TokenEOF) -> pure [t]
-    t        -> (t:) <$> lexStream'
+lexStream = do
+    t <- lexToken
+    case t of
+        Located _ TokenEOF -> pure [TokenEOF]
+        Located _ 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 Lens.Micro.Platform
 import Data.List.Extra
 import Data.Fix
 import Data.Functor.Const
@@ -73,11 +71,12 @@ import Compiler.Types
 
 %%
 
-StandaloneProgram   :: { Program RlpcPs SrcSpan }
-StandaloneProgram   : layout0(Decl)         {% mkProgram $1 }
+StandaloneProgram   :: { RlpProgram RlpcPs }
+StandaloneProgram   : '{' Decls  '}'        {% mkProgram $2 }
+                    | VL  DeclsV VR         {% mkProgram $2 }
 
-StandaloneExpr      :: { Expr' RlpcPs SrcSpan }
-                    : VL Expr VR            { $2 }
+StandaloneExpr      :: { RlpExpr RlpcPs }
+                    : VL Expr VR            { extract $2 }
 
 VL  :: { () }
 VL  : vlbrace       { () }
@@ -86,105 +85,125 @@ VR  :: { () }
 VR  : vrbrace       { () }
     | error         { () }
 
-VS                  :: { () }
-VS                  : ';'                   { () }
-                    | vsemi                 { () }
+Decls               :: { [Decl' RlpcPs] }
+Decls               : Decl ';' Decls        { $1 : $3 }
+                    | 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 }
-            : Var '::' Type             { TySigD [$1] $3 }
+TySigDecl   :: { Decl' RlpcPs }
+            : Var '::' Type             { (\e -> TySigD [extract e]) <<~ $1 <~> $3 }
 
-InfixDecl   :: { Decl RlpcPs SrcSpan }
-            : InfixWord litint InfixOp  {% mkInfixD $1 ($2 ^. _litint) $3 }
+InfixDecl   :: { Decl' RlpcPs }
+            : InfixWord litint InfixOp  { $1 =>> \w ->
+                                          InfixD (extract $1) (extractInt $ extract $2)
+                                          (extract $3) }
 
-InfixWord   :: { Assoc }
-            : infixl                    { InfixL }
-            | infixr                    { InfixR }
-            | infix                     { Infix }
+InfixWord   :: { Located Assoc }
+            : infixl                    { $1 \$> InfixL }
+            | infixr                    { $1 \$> InfixR }
+            | infix                     { $1 \$> Infix  }
 
-DataDecl    :: { Decl RlpcPs SrcSpan }
-            : data Con TyParams '=' DataCons    { DataD $2 $3 $5 }
+DataDecl    :: { Decl' RlpcPs }
+            : 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) }
-            | varname                   { VarT (extractName $1) }
+            | conname                   { fmap ConT (mkPsName $1) }
+            | varname                   { fmap VarT (mkPsName $1) }
 
-Type        :: { Ty RlpcPs }
-            : Type '->' Type            { FunT $1 $3 }
+Type        :: { RlpType' RlpcPs }
+            : 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     : Var Params '=' Expr       { FunD $1 $2 $4 Nothing }
+FunDecl     :: { Decl' RlpcPs }
+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 }
-            : Con Pat1s                 { ConP $1 $2 }
+Pat         :: { Pat' RlpcPs }
+            : 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 }
-            : Con                       { ConP $1 [] }
-            | Var                       { VarP $1 }
-            | Lit                       { LitP $1 }
-            | '(' Pat ')'               { $2 }
+Pat1        :: { Pat' RlpcPs }
+            : Con                       { fmap (`ConP` []) $1 }
+            | Var                       { fmap VarP $1 }
+            | Lit                       { LitP <<= $1 }
+            | '(' Pat ')'               { $1 .> $2 <. $3 }
 
-Expr        :: { Expr' RlpcPs SrcSpan }
+Expr        :: { RlpExpr' RlpcPs }
             -- infixities delayed till next release :(
-            -- : Expr1 InfixOp Expr        { undefined }
-            : AppExpr                   { $1 }
-            | TempInfixExpr             { $1 }
+            -- : Expr1 InfixOp Expr        { $2 =>> \o ->
+            --                              OAppE (extract o) $1 $3 }
+            : 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 }
-            : let layout1(Binding) in Expr      { nolo' $ LetEF NonRec $2 $4 }
-            | letrec layout1(Binding) in Expr   { nolo' $ LetEF Rec $2 $4 }
+LetExpr     :: { RlpExpr' RlpcPs }
+            : let layout1(Binding) in Expr      { $1 \$> LetE $2 $4 }
+            | letrec layout1(Binding) in Expr   { $1 \$> LetrecE $2 $4 }
 
-CaseExpr    :: { Expr' RlpcPs SrcSpan }
-            : case Expr of layout0(Alt)     { nolo' $ CaseEF $2 $4 }
+CaseExpr    :: { RlpExpr' RlpcPs }
+            : case Expr of layout0(CaseAlt)
+                { CaseE <<~ $2 <#> $4 }
 
 -- TODO: where-binds
-Alt         :: { Alt' RlpcPs SrcSpan }
-            : Pat '->' Expr                 { AltA $1 (view _unwrap $3) Nothing }
+CaseAlt     :: { (Alt RlpcPs, Where RlpcPs) }
+            : 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 }
-            : Pat '=' Expr              { PatB $1 (view _unwrap $3) }
+Binding     :: { Binding' RlpcPs }
+            : Pat '=' Expr              { PatB <<~ $1 <~> $3 }
 
-Expr1       :: { Expr' RlpcPs SrcSpan }
-            : '(' Expr ')'              { $2 }
-            | Lit                       { nolo' $ LitEF $1 }
-            | Var                       { case $1 of Located ss _ -> ss :< VarEF $1 }
-            | Con                       { case $1 of Located ss _ -> ss :< VarEF $1 }
+Expr1       :: { RlpExpr' RlpcPs }
+            : '(' Expr ')'              { $1 .> $2 <. $3 }
+            | Lit                       { fmap LitE $1 }
+            | Var                       { fmap VarE $1 }
+            | Con                       { fmap VarE $1 }
 
-InfixOp     :: { PsName }
-            : consym                    { extractName $1 }
-            | varsym                    { extractName $1 }
+InfixOp     :: { Located PsName }
+            : consym                    { mkPsName $1 }
+            | varsym                    { mkPsName $1 }
 
 -- TODO: microlens-pro save me microlens-pro (rewrite this with prisms)
-Lit         :: { Lit RlpcPs }
-            : litint                    { $1 ^. to extract
-                                              . singular _TokenLitInt
-                                              . to IntL }
+Lit         :: { Lit' RlpcPs }
+            : litint                    { $1 <&> (IntL . (\ (TokenLitInt n) -> n)) }
 
-Var         :: { PsName }
-Var         : varname                   { $1 <&> view (singular _TokenVarName) }
-            | varsym                    { $1 <&> view (singular _TokenVarSym) }
+Var         :: { Located PsName }
+Var         : varname                   { mkPsName $1 }
+            | varsym                    { mkPsName $1 }
 
-Con         :: { PsName }
-            : conname                   { $1 <&> view (singular _TokenConName) }
+Con         :: { Located PsName }
+            : conname                   { mkPsName $1 }
 
 {
 
-parseRlpProgR :: (Monad m) => Text -> RLPCT m (Program RlpcPs SrcSpan)
-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 :: (Monad m) => Text -> RLPCT m (RlpExpr RlpcPs)
 parseRlpExprR s = liftErrorful $ pToErrorful parseRlpExpr st
     where
         st = programInitState s
 
-mkInfixD :: Assoc -> Int -> PsName -> P (Decl RlpcPs SrcSpan)
-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 :: (Monad m) => Text -> RLPCT m (RlpProgram 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

@@ -11,12 +11,12 @@ import Data.Functor.Const
 import Data.Functor
 import Data.Text                        qualified as T
 import Text.Printf
-import Control.Lens
+import Lens.Micro
 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
@@ -45,7 +44,8 @@ import Data.HashMap.Strict          qualified as H
 import Data.Void
 import Data.Word                    (Word8)
 import Data.Text                    qualified as T
-import Control.Lens                 hiding ((<<~))
+import Lens.Micro.TH
+import Lens.Micro
 import Rlp.Syntax
 import Compiler.Types
 --------------------------------------------------------------------------------
@@ -54,9 +54,34 @@ 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 +119,10 @@ data RlpToken
     -- literals
     = TokenLitInt Int
     -- identifiers
-    | TokenVarName Text
-    | TokenConName Text
-    | TokenVarSym Text
-    | TokenConSym Text
+    | TokenVarName Name
+    | TokenConName Name
+    | TokenVarSym Name
+    | TokenConSym Name
     -- reserved words
     | TokenData
     | TokenCase
@@ -128,31 +153,6 @@ 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 +282,13 @@ initAlexInput s = AlexInput
 
 --------------------------------------------------------------------------------
 
-
--- deriving instance Lift (Program RlpcPs)
--- deriving instance Lift (Decl RlpcPs)
--- deriving instance Lift (Pat RlpcPs)
--- deriving instance Lift (Lit RlpcPs)
--- deriving instance Lift (Expr RlpcPs)
--- deriving instance Lift (Binding RlpcPs)
--- deriving instance Lift (Ty RlpcPs)
--- deriving instance Lift (Alt RlpcPs)
--- deriving instance Lift (ConAlt RlpcPs)
+deriving instance Lift (RlpProgram RlpcPs)
+deriving instance Lift (Decl RlpcPs)
+deriving instance Lift (Pat RlpcPs)
+deriving instance Lift (Lit RlpcPs)
+deriving instance Lift (RlpExpr RlpcPs)
+deriving instance Lift (Binding RlpcPs)
+deriving instance Lift (RlpType RlpcPs)
+deriving instance Lift (Alt RlpcPs)
+deriving instance Lift (ConAlt RlpcPs)
 

src/Rlp/Syntax.hs

@@ -1,10 +1,363 @@
+-- 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 Rlp.Syntax.Types
+----------------------------------------------------------------------------------
+import Data.Text                    (Text)
+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 Lens.Micro.Pro
+import Lens.Micro.Pro.TH
+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

@@ -13,6 +13,8 @@ import Control.Monad.Utils
 import Control.Arrow
 import Control.Applicative
 import Control.Comonad
+-- import Lens.Micro
+-- import Lens.Micro.Internal
 import Control.Lens
 import Compiler.RLPC
 import Data.List                        (mapAccumL, partition)
@@ -41,12 +43,6 @@ 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 +236,3 @@ typeToCore (VarT'' x)   = TyVar (dsNameToName x)
 dsNameToName :: IdP RlpcPs -> Name
 dsNameToName = id
 
--}
-

src/TI.hs

@@ -20,7 +20,8 @@ import System.IO                (Handle, hPutStr)
 import Text.Printf              (printf, hPrintf)
 import Data.Proxy               (Proxy(..))
 import Data.Monoid              (Endo(..))
-import Control.Lens
+import Lens.Micro
+import Lens.Micro.TH
 import Data.Pretty
 import Data.Heap
 import Core.Examples

tst/Arith.hs

@@ -41,7 +41,6 @@ evalArith (a ::* b)   = evalArith a * evalArith b
 evalArith (a ::- b)   = evalArith a - evalArith b
 
 instance Arbitrary ArithExpr where
-    -- TODO: implement shrink
     arbitrary = gen 4
         where
             gen :: Int -> Gen ArithExpr

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
-            ]
-