더 간단한 신택스 annotations

doc/libraries.org

@@ -1,5 +1,7 @@
 #+title: on libraries
 
+* libraries and the file system
+
 R⁷RS leaves it unspecified how exactly libraries correspond to files:
 
 #+begin_quote
@@ -7,3 +9,11 @@ Programs and libraries are typically stored in files, although in some implement
 #+end_quote
 
 thus the implementation of ~define-library~ is open to much interpretation. we could possibly define libraries as first-class objects, or deal with them statically. the former case is appealing to me, as it could massively simplify interactive use.
+
+* semantics of declaration order
+
+mercifully, R⁷RS is similarly ambiguous when it comes to the significance of declaration order. the authors note explicitly example two equally acceptable approaches:
+
+#+begin_quote
+One possible implementation of libraries is as follows: _After all cond-expand library declarations are expanded, a new environment is constructed for the library consisting of all imported bindings._ The expressions from all begin, include and include-ci library declarations are expanded in that environment in the order in which they occur in the library. _Alternatively, cond-expand and import declarations may be processed in left to right order interspersed with the processing of other declarations_, with the environment growing as imported bindings are added to it by each import declaration.
+#+end_quote

flake.nix

@@ -55,7 +55,7 @@
                 nodejs
                 wasm-tools
                 wac-cli
-                guile
+                gauche
                 rust-analyzer
                 wasmtime
                 # bashInteractive is necessary to work around an

golden/print/begin-nonempty-thin

@@ -1,4 +1,4 @@
 (begin
-  책을
-  더
-  먹으세요~!)
+  책을
+  더
+  먹으세요~!)

golden/print/begin-nonempty-wide

@@ -1,4 +1,4 @@
 (begin
-  책을
-  더
-  먹으세요~!)
+  책을
+  더
+  먹으세요~!)

golden/print/lambda-thin

@@ -1,5 +1,5 @@
 (lambda
-    (어간
-     어미)
-  (display
-   꾸깃))
+    (어간
+     어미)
+  (display
+   꾸깃))

golden/print/lambda-wide

@@ -1,2 +1,2 @@
-(lambda (어간 어미)
-  (display 꾸깃))
+(lambda (어간 어미)
+  (display 꾸깃))

golden/print/simple-list-thin

@@ -1,4 +1,4 @@
-(가
- 나
- 다
- 라)
+(가
+ 나
+ 다
+ 라)

golden/print/simple-list-wide

@@ -1 +1 @@
-(가 나 다 라)
+(가 나 다 라)

golden/read/bool/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/bool/source.scm"
             , sourceLine = Pos 1
@@ -9,8 +8,7 @@
         )
     } :< SimpleF ( SimpleBoolean True )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/bool/source.scm"
             , sourceLine = Pos 1
@@ -19,8 +17,7 @@
         )
     } :< SimpleF ( SimpleBoolean True )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/bool/source.scm"
             , sourceLine = Pos 1
@@ -29,8 +26,7 @@
         )
     } :< SimpleF ( SimpleBoolean False )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/bool/source.scm"
             , sourceLine = Pos 1

golden/read/decimal/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/decimal/source.scm"
             , sourceLine = Pos 1
@@ -10,8 +9,7 @@
     } :< SimpleF
     ( SimpleNumber 45.0 )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/decimal/source.scm"
             , sourceLine = Pos 1
@@ -21,8 +19,7 @@
     } :< SimpleF
     ( SimpleNumber 5667.0 )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/decimal/source.scm"
             , sourceLine = Pos 1

golden/read/list-dot-flat/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/list-dot-flat/source.scm"
             , sourceLine = Pos 1
@@ -11,8 +10,7 @@
     ( DotListF
         (
             ( MkAnn
-                { syntax = SynNone
-                , position = Just
+                { position = Just
                     ( SourcePos
                         { sourceName = "golden/read/list-dot-flat/source.scm"
                         , sourceLine = Pos 1
@@ -23,8 +21,7 @@
                 ( SimpleSymbol "가" )
             ) :|
             [ MkAnn
-                { syntax = SynNone
-                , position = Just
+                { position = Just
                     ( SourcePos
                         { sourceName = "golden/read/list-dot-flat/source.scm"
                         , sourceLine = Pos 1
@@ -34,8 +31,7 @@
                 } :< SimpleF
                 ( SimpleSymbol "나" )
             , MkAnn
-                { syntax = SynNone
-                , position = Just
+                { position = Just
                     ( SourcePos
                         { sourceName = "golden/read/list-dot-flat/source.scm"
                         , sourceLine = Pos 1
@@ -47,8 +43,7 @@
             ]
         )
         ( MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-dot-flat/source.scm"
                     , sourceLine = Pos 1

golden/read/list-flat/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/list-flat/source.scm"
             , sourceLine = Pos 1
@@ -8,10 +7,9 @@
             }
         )
     } :< CompoundF
-    ( ListF Ordinary
+    ( ListF StyleData
         [ MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1
@@ -21,8 +19,7 @@
             } :< SimpleF
             ( SimpleSymbol "가" )
         , MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1
@@ -32,8 +29,7 @@
             } :< SimpleF
             ( SimpleSymbol "나" )
         , MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1
@@ -43,8 +39,7 @@
             } :< SimpleF
             ( SimpleSymbol "다" )
         , MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1
@@ -54,8 +49,7 @@
             } :< SimpleF
             ( SimpleSymbol "라" )
         , MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1
@@ -65,8 +59,7 @@
             } :< SimpleF
             ( SimpleNumber 1.0 )
         , MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1
@@ -76,8 +69,7 @@
             } :< SimpleF
             ( SimpleNumber 2.0 )
         , MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list-flat/source.scm"
                     , sourceLine = Pos 1

golden/read/list/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/list/source.scm"
             , sourceLine = Pos 1
@@ -11,8 +10,7 @@
     ( DotListF
         (
             ( MkAnn
-                { syntax = SynNone
-                , position = Just
+                { position = Just
                     ( SourcePos
                         { sourceName = "golden/read/list/source.scm"
                         , sourceLine = Pos 1
@@ -23,8 +21,7 @@
                 ( SimpleSymbol "a" )
             ) :|
             [ MkAnn
-                { syntax = SynNone
-                , position = Just
+                { position = Just
                     ( SourcePos
                         { sourceName = "golden/read/list/source.scm"
                         , sourceLine = Pos 1
@@ -34,8 +31,7 @@
                 } :< SimpleF
                 ( SimpleSymbol "b" )
             , MkAnn
-                { syntax = SynNone
-                , position = Just
+                { position = Just
                     ( SourcePos
                         { sourceName = "golden/read/list/source.scm"
                         , sourceLine = Pos 1
@@ -43,10 +39,9 @@
                         }
                     )
                 } :< CompoundF
-                ( ListF Ordinary
+                ( ListF StyleData
                     [ MkAnn
-                        { syntax = SynNone
-                        , position = Just
+                        { position = Just
                             ( SourcePos
                                 { sourceName = "golden/read/list/source.scm"
                                 , sourceLine = Pos 1
@@ -56,8 +51,7 @@
                         } :< SimpleF
                         ( SimpleSymbol "c" )
                     , MkAnn
-                        { syntax = SynNone
-                        , position = Just
+                        { position = Just
                             ( SourcePos
                                 { sourceName = "golden/read/list/source.scm"
                                 , sourceLine = Pos 1
@@ -71,8 +65,7 @@
             ]
         )
         ( MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/list/source.scm"
                     , sourceLine = Pos 1
@@ -80,10 +73,9 @@
                     }
                 )
             } :< CompoundF
-            ( ListF Ordinary
+            ( ListF StyleData
                 [ MkAnn
-                    { syntax = SynNone
-                    , position = Just
+                    { position = Just
                         ( SourcePos
                             { sourceName = "golden/read/list/source.scm"
                             , sourceLine = Pos 1
@@ -93,8 +85,7 @@
                     } :< SimpleF
                     ( SimpleSymbol "가" )
                 , MkAnn
-                    { syntax = SynNone
-                    , position = Just
+                    { position = Just
                         ( SourcePos
                             { sourceName = "golden/read/list/source.scm"
                             , sourceLine = Pos 1
@@ -105,8 +96,7 @@
                     ( DotListF
                         (
                             ( MkAnn
-                                { syntax = SynNone
-                                , position = Just
+                                { position = Just
                                     ( SourcePos
                                         { sourceName = "golden/read/list/source.scm"
                                         , sourceLine = Pos 1
@@ -118,8 +108,7 @@
                             ) :| []
                         )
                         ( MkAnn
-                            { syntax = SynNone
-                            , position = Just
+                            { position = Just
                                 ( SourcePos
                                     { sourceName = "golden/read/list/source.scm"
                                     , sourceLine = Pos 1
@@ -131,8 +120,7 @@
                         )
                     )
                 , MkAnn
-                    { syntax = SynNone
-                    , position = Just
+                    { position = Just
                         ( SourcePos
                             { sourceName = "golden/read/list/source.scm"
                             , sourceLine = Pos 1

golden/read/meta-expression/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/meta-expression/source.scm"
             , sourceLine = Pos 1

golden/read/meta-splice-expression/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/meta-splice-expression/source.scm"
             , sourceLine = Pos 1

golden/read/meta-splice-variable/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/meta-splice-variable/source.scm"
             , sourceLine = Pos 1

golden/read/meta-variable/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/meta-variable/source.scm"
             , sourceLine = Pos 1

golden/read/peculiar-identifier-dot/read

@@ -1,7 +1,61 @@
-[ SynNone :< SimpleF
+[ MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-dot/source.scm"
+            , sourceLine = Pos 1
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol "..." )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-dot/source.scm"
+            , sourceLine = Pos 2
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
     ( SimpleSymbol ".." )
-, SynNone :< SimpleF
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-dot/source.scm"
+            , sourceLine = Pos 3
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
     ( SimpleSymbol ".abc" )
-, SynNone :< SimpleF
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-dot/source.scm"
+            , sourceLine = Pos 4
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
     ( SimpleSymbol "....abcc" )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-dot/source.scm"
+            , sourceLine = Pos 5
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol ".++-" )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-dot/source.scm"
+            , sourceLine = Pos 6
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol ".-" )
 ]

golden/read/peculiar-identifier-dot/source.scm

@@ -1 +1,6 @@
-.. .abc ....abcc
+...
+..
+.abc
+....abcc
+.++-
+.-

golden/read/peculiar-identifier-sign/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
             , sourceLine = Pos 1
@@ -10,8 +9,7 @@
     } :< SimpleF
     ( SimpleSymbol "+" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
             , sourceLine = Pos 1
@@ -20,4 +18,54 @@
         )
     } :< SimpleF
     ( SimpleSymbol "-" )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
+            , sourceLine = Pos 3
+            , sourceColumn = Pos 1
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol "+." )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
+            , sourceLine = Pos 3
+            , sourceColumn = Pos 4
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol "+.." )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
+            , sourceLine = Pos 3
+            , sourceColumn = Pos 8
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol "-." )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
+            , sourceLine = Pos 3
+            , sourceColumn = Pos 11
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol "-...abc" )
+, MkAnn
+    { position = Just
+        ( SourcePos
+            { sourceName = "golden/read/peculiar-identifier-sign/source.scm"
+            , sourceLine = Pos 3
+            , sourceColumn = Pos 19
+            }
+        )
+    } :< SimpleF
+    ( SimpleSymbol "-abc.." )
 ]

golden/read/peculiar-identifier-sign/source.scm

@@ -1 +1,3 @@
 + -
+
++. +.. -. -...abc -abc..

golden/read/string/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/string/source.scm"
             , sourceLine = Pos 1

golden/read/typical-identifier-token/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier-token/source.scm"
             , sourceLine = Pos 1
@@ -10,8 +9,7 @@
     } :< SimpleF
     ( SimpleSymbol "abc" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier-token/source.scm"
             , sourceLine = Pos 1
@@ -21,8 +19,7 @@
     } :< SimpleF
     ( SimpleString "xyz" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier-token/source.scm"
             , sourceLine = Pos 2
@@ -32,8 +29,7 @@
     } :< SimpleF
     ( SimpleSymbol "수학" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier-token/source.scm"
             , sourceLine = Pos 2
@@ -41,10 +37,9 @@
             }
         )
     } :< CompoundF
-    ( ListF Ordinary
+    ( ListF StyleData
         [ MkAnn
-            { syntax = SynNone
-            , position = Just
+            { position = Just
                 ( SourcePos
                     { sourceName = "golden/read/typical-identifier-token/source.scm"
                     , sourceLine = Pos 2

golden/read/typical-identifier/read

@@ -1,6 +1,5 @@
 [ MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -10,8 +9,7 @@
     } :< SimpleF
     ( SimpleSymbol "abc" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -21,8 +19,7 @@
     } :< SimpleF
     ( SimpleSymbol "bala-hwa$" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -32,8 +29,7 @@
     } :< SimpleF
     ( SimpleSymbol "x!!!" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -43,8 +39,7 @@
     } :< SimpleF
     ( SimpleSymbol "z" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -54,8 +49,7 @@
     } :< SimpleF
     ( SimpleSymbol "z123" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -65,8 +59,7 @@
     } :< SimpleF
     ( SimpleSymbol "나는너무졸리다" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 1
@@ -76,8 +69,7 @@
     } :< SimpleF
     ( SimpleSymbol "學" )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 3
@@ -87,8 +79,7 @@
     } :< SimpleF
     ( SimpleSymbol "車室." )
 , MkAnn
-    { syntax = SynNone
-    , position = Just
+    { position = Just
         ( SourcePos
             { sourceName = "golden/read/typical-identifier/source.scm"
             , sourceLine = Pos 5

gyehoek.cabal

@@ -26,6 +26,7 @@ common ghcstuffs
   ghc-options:
     -Wall -fdefer-type-errors -fno-show-valid-hole-fits
     -fdefer-out-of-scope-variables -threaded
+    -Wno-name-shadowing -Wno-partial-type-signatures
 
   default-extensions:
     BlockArguments
@@ -54,6 +55,7 @@ executable gyehoek
 library
   import:           ghcstuffs, ghcstuffs-dev
   ghc-options:      -fplugin=Effectful.Plugin
+  -- build-tool-depends: retrie:retrie
 
   -- cabal-fmt: expand src
   exposed-modules:
@@ -66,9 +68,12 @@ library
     Gyehoek.GenSym
     Gyehoek.Jalmot
     Gyehoek.Language
+    Gyehoek.Language.Common
     Gyehoek.Lift1
     Gyehoek.Options
     Gyehoek.Prelude
+    Gyehoek.Scheme.Expand
+    Gyehoek.Scheme.Expand.Old
     Gyehoek.Scheme.Syntax
     Gyehoek.Sexp
     Gyehoek.Sexp.Grammar
@@ -109,14 +114,17 @@ library
     , process
     , recursion-schemes
     , scientific
+    , semialign
     , string-interpolate
+    , tardis
     , template-haskell
     , text
     , text-short
+    , these
     , typed-process
     , unordered-containers
     , vector
-    , tardis
+    , witherable
 
   hs-source-dirs:   src
   default-language: GHC2024

macroexpand.scm

@@ -0,0 +1,11 @@
+(define-syntax if-not
+  (syntax-rules ()
+    ((_ c t f) (if (not c) t f))
+    ((_ c t) (if (not c) t))))
+
+(write (macroexpand-1 '(if-not #t 123 456)))
+
+(define (main)
+  (let loop ((datum (read)))
+    (unless (eof-object? datum)
+      ())))

src/Gyehoek/CPS/Close.hs

@@ -18,7 +18,7 @@ genCodeName f = gensym' @Name $ f ^. _Wrapped' . to (<> "-code")
 
 bindEnv :: List Name -> Exp -> Exp
 bindEnv frees m = [cps|
-  (prim (get-env) (κ #{frees} #{m}))
+  (builtin (get-env) (κ #{frees} #{m}))
 |]
 
 close1 :: forall es. GenSym :> es => Exp -> Eff es Exp
@@ -41,7 +41,7 @@ close1 = \case
     let codes = bs' ^.. each . _1 . to MkLabel
     pure [cps|
       (letrec #{bs'}
-        (prim (make-shared-closure #{codes} #{frees})
+        (builtin (make-shared-closure #{codes} #{frees})
           (κ #{boundNames}
             #{e})))
     |]

src/Gyehoek/CPS/Convert.hs

@@ -46,18 +46,13 @@ convert (Scm.ExpLit l) k = k . one . ValImm $ case l of
   LitBool b -> ImmBool b
   _ -> _
 
-convert (Scm.ExpPrim p) k =
+convert (Scm.ExpBuiltin p) k =
   telescope (convert1 @es) p \p' -> do
     r_l <- gensym' "r"
-    -- k_l <- gensym' @Name "prim-k"
     m <- k [ValVar r_l]
     pure [cps|
-      (prim #{p'} (κ (#{r_l}) #{m}))
+      (builtin #{p'} (κ (#{r_l}) #{m}))
     |]
-    -- pure [cps|
-    --   (letrec ((#{k_l} (κ (#{r_l}) #{m})))
-    --     (prim #{p'} #{k_l}))
-    -- |]
 
 convert (Scm.ExpLambda xs e) k = do
   f <- gensym' "lambda-body"
@@ -78,7 +73,7 @@ convert (Scm.ExpApply f xs) k =
 
 convert (Scm.ExpBegin xs) k = telescope (convert @es) xs (k . NE.last)
 
-convert (Scm.ExpIf c t f) k =
+convert (Scm.ExpIf c t (Just f)) k =
   convert1 c \c' -> do
     t_l <- gensym' @Name "truthy-cont"
     f_l <- gensym' @Name "falsey-cont"

src/Gyehoek/CPS/Eval.hs

@@ -226,7 +226,7 @@ eval g dps (ExpLetRec bs e) = do
   traverse_ (uncurry assign) $ zip ls (bs' ^.. each . _2)
   eval g' dps e
 
-eval g dps (ExpPrim (PrimCallCC withcc) k) = do
+eval g dps (ExpBuiltin (BuiltinCallCC withcc) k) = do
   withcc' <- evalVal g withcc >>= orWrong #_EProcedure
     [i|call/cc: 함수가 아닌 것을 받았다|]
   k' <- evalKexp g k
@@ -236,8 +236,8 @@ eval g dps (ExpPrim (PrimCallCC withcc) k) = do
         Nothing -> wrong [i|call/cc: 잘못하는데!|]
   withcc' [cc,k'] dps
 
-eval g dps (ExpPrim p k) = do
-  p' <- evalPrim g dps =<< traverse (evalVal g) p
+eval g dps (ExpBuiltin p k) = do
+  p' <- evalBuiltin g dps =<< traverse (evalVal g) p
   evalKexp g k >>= \case
     EProcedure fp -> fp p' dps
     _ -> wrong [i|prim(#{p})의 계속을 나쁘다|]
@@ -251,20 +251,20 @@ eval g dps (ExpIf c t f) = do
 
 eval g dps e = error [i|unimplemented #{e}|]
 
-evalPrim :: Env -> DynPoints -> Prim E -> M Answer (List E)
-evalPrim g dps = \case
-  PrimAdd x y -> arith2 (+) x y
-  PrimMul x y -> arith2 (*) x y
-  PrimSub x y -> arith2 (-) x y
-  PrimDiv x y -> arith2 div x y
-  PrimZeroP x -> pure1 . EBool . isJust $ x ^? #EInt . only 0
-  PrimCons x y -> pcons x y >>= pure1
-  PrimCar p -> cr p _2
-  PrimCdr p -> cr p _3
-  PrimPairP p -> pure1 . EBool . maybe False (const True) $
+evalBuiltin :: Env -> DynPoints -> Builtin E -> M Answer (List E)
+evalBuiltin g dps = \case
+  BuiltinAdd x y -> arith2 (+) x y
+  BuiltinMul x y -> arith2 (*) x y
+  BuiltinSub x y -> arith2 (-) x y
+  BuiltinDiv x y -> arith2 div x y
+  BuiltinZeroP x -> pure1 . EBool . isJust $ x ^? #EInt . only 0
+  BuiltinCons x y -> pcons x y >>= pure1
+  BuiltinCar p -> cr p _2
+  BuiltinCdr p -> cr p _3
+  BuiltinPairP p -> pure1 . EBool . maybe False (const True) $
     p ^? #_EPair
-  PrimValues xs -> pure xs
-  PrimList xs -> foldrM pcons ENull xs >>= pure1
+  BuiltinValues xs -> pure xs
+  BuiltinList xs -> foldrM pcons ENull xs >>= pure1
   p -> wrong [i|prim(#{p})은 벌써 나지 않다|]
   where
     pure1 x = pure [x]

src/Gyehoek/CPS/Syntax.hs

@@ -5,6 +5,8 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE DeriveAnyClass #-}
+{- HLINT ignore "Avoid lambda using `infix`" -}
+{- HLINT ignore "Redundant $" -}
 module Gyehoek.CPS.Syntax
   ( Val(..)
   , Kappa(..)
@@ -13,7 +15,7 @@ module Gyehoek.CPS.Syntax
   , Kexp(..)
   , ExpF(..)
   , Name(..)
-  , Prim(..)
+  , Builtin(..)
   , Program(..)
   , HoistedProgram(..)
   , Lit(..)
@@ -25,7 +27,7 @@ module Gyehoek.CPS.Syntax
   , pattern Halt
   , pattern Halt1
   , _MkKappa
-  , _ExpPrim
+  , _ExpBuiltin
   , _ExpLetRec
   , _ExpApply
   , _AbsLambda'
@@ -50,7 +52,7 @@ module Gyehoek.CPS.Syntax
   )
   where
 
-import Gyehoek.Scheme.Syntax (Name (..), Prim(..), primDatumIso, Lit(..))
+import Gyehoek.Scheme.Syntax (Name (..), Builtin(..), builtinDatumIso, Lit(..))
 import Gyehoek.Sexp qualified as S
 import Control.Category
 import Prelude hiding ((.), id)
@@ -59,15 +61,12 @@ import Data.Monoid (Endo)
 import Data.Functor.Foldable.TH
 import Data.Data.Lens (uniplate)
 import Gyehoek.Prelude hiding (op)
-import Gyehoek.Sexp (Datum)
-import Gyehoek.Sexp (G, (:-)(..))
+import Gyehoek.Sexp (G, (:-)(..), Datum)
 import qualified Data.InvertibleGrammar.Base as IG
 import Gyehoek.GenSym (Gen)
 import Data.String (IsString)
 import Control.Applicative
 import qualified Data.HashMap.Strict as H
-import GHC.Records (HasField (..))
-import Data.Bifunctor
 
 -- Data types
 
@@ -103,6 +102,7 @@ data Obj
   deriving stock (Show, Generic, Data, Eq)
   deriving anyclass (NFData)
 
+pattern ObjLabel :: Label -> Obj
 pattern ObjLabel l = ObjImm (ImmLabel l)
 
 -- | a heap object.
@@ -163,7 +163,7 @@ pattern ExpJump f xs ktail <- (preview _ExpJump -> Just (f,xs,ktail))
   where ExpJump f xs ktail = review _ExpJump (f,xs,ktail)
 
 data Exp
-  = ExpPrim (Prim Val) Kexp
+  = ExpBuiltin (Builtin Val) Kexp
   | ExpLetRec { binders :: List (Name, Abs), body :: Exp }
   | ExpContinue Val (List Val)
   | ExpIf Val Name Name
@@ -188,7 +188,7 @@ pattern Halt1 x = ExpContinue (ValLabel "halt") [x]
 data Def = DefConstant Name Exp
   deriving (Show, Generic, Data)
 
-data Program = MkProgram
+newtype Program = MkProgram
   { body :: Lambda
   }
   deriving (Show, Generic, Data)
@@ -272,7 +272,7 @@ instance S.DatumIso Imm where
 
 instance S.DatumIso Label where
   datumIso = S.with \g -> S.coproduct
-    [ S.decorate S.SynConstant >>> S.datumIso @Name >>> S.prismIso
+    [ S.datumIso @Name >>> S.prismIso
           (S.expected "label")
           (prefixed @Name "$")
     , S.list $ S.el (S.sym "$") >>> S.el (S.datumIso @Name)
@@ -281,7 +281,7 @@ instance S.DatumIso Label where
 
 instance S.DatumIso Reg where
   datumIso = S.with \g ->
-    S.decorate S.SynVariable >>> S.datumIso @Name >>> S.prismIso
+    S.datumIso @Name >>> S.prismIso
       (S.expected "register")
       (prefixed @Name "%")
     >>> g
@@ -335,16 +335,16 @@ instance S.DatumIso Abs where
 
 instance S.DatumIso Exp where
   datumIso = S.match
-    $ S.With (. prim)
+    $ S.With (. builtin)
     $ S.With (. letrec)
     $ S.With (. continue)
     $ S.With (. if_)
     $ S.With (. app)
     $ S.End
     where
-      continue = S.list $
-        S.el (S.decorate S.SynBuiltin >>> S.sym "continue")
-        >>> S.el (S.decorate S.SynProcedure >>> S.datumIso)
+      continue = S.listWithStyle (S.StyleSyntax 1) $
+        S.el (S.sym "continue")
+        >>> S.el S.datumIso
         >>> S.rest S.datumIso
       letrec = S.letLike "letrec" S.datumIso S.datumIso S.datumIso
       if_ = S.ifLike "if"
@@ -365,9 +365,9 @@ instance S.DatumIso Exp where
         >>> S.el (S.datumIso @Kexp)
         >>> S.rest (S.datumIso @Val)
         >>> S.onTail S.swap
-      prim = S.list $
-        S.el (S.decorate S.SynBuiltin >>> S.sym "prim")
-        >>> S.el (primDatumIso id (S.datumIso @Val))
+      builtin = S.listWithStyle (S.StyleSyntax 1) $
+        S.el (S.sym "builtin")
+        >>> S.el (builtinDatumIso id (S.datumIso @Val))
         >>> S.el S.datumIso
 
 instance S.DatumIso Kexp where
@@ -414,15 +414,9 @@ cps = S.makeSx' [| toCPS |]
 
 
 
-deleteFrom :: (Foldable f, Hashable a) => f a -> HashSet a -> HashSet a
-deleteFrom = flip $ foldr HS.delete
-
 insertFrom :: (Foldable f, Hashable a) => f a -> HashSet a -> HashSet a
 insertFrom = flip $ foldr HS.insert
 
-toHashSetOf :: Hashable a => Getting (Endo (HashSet a)) s a -> s -> HashSet a
-toHashSetOf l = foldrOf l HS.insert mempty
-
 class Free a where
   free :: a -> HashSet Name
   free = freeWithBound mempty
@@ -453,7 +447,7 @@ instance Free Kexp where
 
 instance Free Exp where
   freeWithBound' bound = \case
-    ExpPrim p k ->
+    ExpBuiltin p k ->
       (p ^.. folded . #ValVar . filtered (`notElem` bound))
       ++ freeWithBound' bound k
     ExpLetRec bs m ->

src/Gyehoek/Language/Common.hs

@@ -0,0 +1,62 @@
+{-# LANGUAGE DeriveAnyClass #-}
+module Gyehoek.Language.Common
+  (
+  -- * Syntax
+    Lib(..)
+  , LibName(..)
+  , Exports
+  , Imports
+  , ExternName(..)
+  , Name(..)
+  ) where
+
+import Gyehoek.Prelude
+import Data.String (IsString)
+import Gyehoek.GenSym (Gen)
+import qualified Gyehoek.Sexp as S
+
+
+-- | R⁷RS 라이프러리의 표현.
+data Lib name body = MkLib
+  { name :: LibName
+  , exports :: Exports name
+  , imports :: Imports name
+  }
+  deriving (Show)
+
+newtype LibName = MkLibName { getLibName :: NonEmpty Text }
+  deriving stock (Show, Generic, Data, Eq)
+  deriving anyclass (NFData, Hashable)
+
+-- | A map whose keys are names of library definitions and whose
+-- values are the names they are exported as. An @⟨identifier⟩@ @x@
+-- corresponds to an entry @(⟨identifier⟩, ⟨identifier⟩)@, while a
+-- @(rename ⟨identifier₁⟩ ⟨identifier₂⟩)@ form corresponds to an entry
+-- @(⟨identifier₁⟩, ⟨identifier₂⟩)@.
+type Exports name = HashMap name ExternName
+
+-- | A map whose keys are symbols to be brought into the library's
+-- environment and whose values are pairs of the library in which the
+-- symbol is defined and the name the symbol is exported as.
+type Imports name = HashMap name (LibName, ExternName)
+
+-- | Representation of an identifier at the library boundary. While
+-- 'Name's are used within a compilation unit and may be decorated
+-- with additional structure and metadata, they are exported as
+-- 'ExternName's, which are essentially just plain strings.
+newtype ExternName = MkExternName { getExternName :: Text }
+  deriving newtype (Show)
+
+newtype Name = MkName { inner :: Text }
+  deriving newtype (Show, Eq, Ord, IsString, Gen, Hashable)
+  deriving stock (Generic, Data)
+  deriving anyclass (Wrapped, NFData)
+
+instance Prefixed Name where
+  prefixed (MkName s) = _Wrapped' . prefixed @Text s . from _Wrapped'
+
+
+--- DatumIsos
+
+instance S.DatumIso Name where
+  datumIso = S.symbol >>> S.iso coerce coerce

src/Gyehoek/Scheme/Expand.hs

@@ -0,0 +1,536 @@
+{-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE TypeFamilies #-}
+module Gyehoek.Scheme.Expand
+  (
+  ) where
+
+import Gyehoek.Sexp.Syntax
+import Gyehoek.Sexp qualified as S
+import Gyehoek.Prelude
+import Gyehoek.Scheme.Syntax hiding (Prim(..))
+import Gyehoek.Scheme.Syntax qualified as Scm
+import qualified Data.HashSet as HS
+import qualified Data.HashMap.Strict as H
+import Data.Foldable
+import Data.These
+import Data.Zip
+import Prelude hiding (filter, zip, mapMaybe)
+import qualified Data.List.NonEmpty as NE
+import Data.Monoid (Ap(Ap, getAp))
+import Gyehoek.Sexp.Grammar.Base ((:-)(..))
+import Control.Lens.Extras (is)
+import Control.Applicative (Alternative(..))
+import Gyehoek.GenSym
+import Data.HashSet.Lens (setOf)
+import Data.List (sort)
+import GHC.Exts (IsList(..))
+import Gyehoek.Jalmot
+import Data.Maybe (isNothing)
+import Data.Kind (Type)
+import Data.Traversable (for, mapAccumR)
+import Effectful.State.Dynamic
+import Witherable
+import Data.Semigroup (Arg(..))
+import Data.Ord (Down(..))
+import qualified Data.Scientific as Sci
+
+
+data Bind
+  = BindLexical { symbol :: Name, identity :: Natural }
+  | BindGlobal { symbol :: Name }
+  deriving stock (Generic, Eq, Show)
+  deriving anyclass (Hashable)
+
+newtype Scope = MkScope { identity :: Natural }
+  deriving stock (Show, Generic, Eq, Ord)
+  deriving anyclass (Hashable)
+  deriving newtype (Gen)
+
+type ScopeSet = HashSet Scope
+
+data Formals
+  = FormalsFixed (List Name)
+  | FormalsRest (List Name) Name
+  deriving (Show, Generic)
+
+data PrimLambda e = MkPrimLambda Formals (List e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+data PrimLet e = MkPrimLet (Maybe Name) (List (Name, e)) (List e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+data PrimIf e = MkPrimIf e e (Maybe e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+data PrimLetSyntax e = MkPrimLetSyntax (List (Name, e)) (List e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+
+data Prim e
+  = PrimLambda (PrimLambda e)
+  | PrimLet (PrimLet e)
+  | PrimIf (PrimIf e)
+  | PrimLetSyntax (PrimLetSyntax e)
+  | PrimSyntaxRules Trans
+  deriving (Show, Generic)
+
+data Key = MkKey Name (HashSet Scope)
+  deriving stock (Show, Generic, Eq)
+  deriving anyclass (Hashable)
+
+
+
+instance S.DatumIso Scope where
+  datumIso = S.with (S.datumIso >>>)
+
+hashSetGrammar
+  :: forall a. (Hashable a, Ord a)
+  => S.DatumGrammar a -> S.DatumGrammar (HashSet a)
+hashSetGrammar g =
+  S.list (S.rest g)
+  >>> S.iso HS.fromList (sort . HS.toList)
+
+instance S.DatumIso Key where
+  datumIso = S.with \g ->
+    S.list
+      ( S.el (S.sym "@")
+      >>> S.el (S.datumIso @Name)
+      >>> S.el (hashSetGrammar S.datumIso)
+      )
+    >>> g
+
+instance S.DatumIso Formals where
+  datumIso = S.match
+    $ S.With (fixed >>>)
+    $ S.With (rest >>>)
+    $ S.End
+    where
+      fixed :: S.G (Datum :- t) (List Name :- t)
+      fixed = S.list $ S.rest $ S.datumIso @Name
+      rest :: S.G (Datum :- t) (Name :- List Name :- t)
+      rest = S.coproduct
+        [ S.dottedList (S.rest $ S.datumIso @Name) (S.datumIso @Name)
+        , S.datumIso @Name >>> S.onTail (S.push [] null (const mempty))
+        ]
+
+optEl
+  :: S.G (S.Datum :- t) (a :- t)
+  -> S.G (S.ListContext :- t) (S.ListContext :- Maybe a :- t)
+optEl g =
+  S.coproduct
+    [ S.el g >>> S.onTail (S.partialIso Just \case
+      Nothing -> Left mempty
+      Just x -> Right x)
+    , S.onTail $ S.push Nothing isNothing (const mempty)
+    ]
+
+anykw :: Text -> S.G (Datum :- t) t
+anykw s = S.Flip $ S.PartialIso
+  (\t -> adorn SynBuiltin (Symbol s) :- t)
+  \case
+    (Symbol _ :- t) -> Right t
+    _ -> Left $ S.expected "symbol"
+
+prim_if :: S.DatumIso e => S.DatumGrammar (PrimIf e)
+prim_if = S.with \g ->
+  S.listWithStyle (StyleSyntax 1)
+    (S.el (anykw "if")
+    >>> S.el S.datumIso
+    >>> S.el S.datumIso
+    >>> optEl S.datumIso)
+  >>> g
+
+prim_lambda :: S.DatumIso e => S.DatumGrammar (PrimLambda e)
+prim_lambda = S.with \g ->
+  S.lambdaLike (anykw "λ") (S.datumIso @Formals) (S.rest S.datumIso)
+  >>> g
+
+prim_let
+  :: forall e. S.DatumIso e => S.DatumGrammar (PrimLet e)
+prim_let = S.with \g ->
+  (S.listWithStyle (StyleSyntax 1) $
+    S.el (anykw "let")
+    >>> optEl (S.datumIso @Name)
+    >>> S.el (S.list $ S.rest $ S.datumIso @(Name,e))
+    >>> S.rest S.datumIso)
+  >>> g
+
+prim_let_syntax :: S.DatumIso e => S.DatumGrammar (PrimLetSyntax e)
+prim_let_syntax = S.with \g ->
+  (S.listWithStyle (StyleSyntax 1) $
+    S.el (anykw "let-syntax")
+    >>> S.el (S.list $ S.rest $ S.datumIso)
+    >>> S.rest S.datumIso)
+  >>> g
+
+instance S.DatumIso Bind where
+  datumIso = S.match
+    $ S.With (\g ->
+      S.list (S.el (S.sym "L") >>> S.el S.datumIso >>> S.el S.datumIso)
+      >>> g)
+    $ S.With (\g ->
+      S.list (S.el (S.sym "G") >>> S.el S.datumIso)
+      >>> g)
+    $ S.End
+
+
+
+{- |
+
+* Examples
+
+>>> :set -XTemplateHaskellQuotes
+>>> pat = S.makeSx [|| S.fromDatumUnsafe @Pat S.datumIso ||]
+>>> match [] [pat|(x . y)|] [S.sx|(1 2 . 2)|]
+Nothing
+>>> match [] [pat|(x . y)|] [S.sx|(1 . 2)|]
+Just
+...
+>>> match ["=>"] [pat|(x => y)|] [S.sx|(1 => 2)|]
+Just
+...
+>>> match ["=>"] [pat|(x => y)|] [S.sx|(1 -> 2)|]
+Nothing
+-}
+match :: Foldable f
+  => f Text
+  -- ^ Literal keywords
+  -> Pat
+  -> Datum
+  -> Maybe (HashMap Name Datum)
+match kws p = getAp . match' p where
+
+  match' :: Pat -> Datum -> Ap Maybe (HashMap Name Datum)
+  
+  match' PatWildcard _ = pure mempty
+  
+  match' (PatVar x) e
+    | coerce x `elem` kws = case e of
+      Symbol x' | coerce x == x' -> pure mempty
+      _                          -> empty
+    | otherwise = pure $ H.singleton x e
+  
+  match' (PatList ps Nothing Nothing) (List es) = matches ps es
+  
+  match' (PatList ps (Just []) Nothing) (List es) = do
+    let (ps',p) = ps ^?! _Snoc
+    (r,rest) <- fold $ alignWith f ps' es
+    rest' <- rest
+      & fmap (fmap (fmap (:[])) . match' p)
+      & foldr (liftA2 $ H.unionWith (<>)) mempty
+      & fmap (fmap List)
+    pure $ r <> rest'
+    where
+      f (These a b) = (,[]) <$> match' a b
+      f (This a) = empty
+      f (That b) = pure (mempty,[b])
+  
+  match' (PatList ps Nothing (Just p)) (DotList es e) =
+    matches (p:|ps) (NE.cons e es)
+  
+  match' _ _ = _
+  
+  matchPrefix
+    :: (Semialign f, Foldable f)
+    => f Pat -> f Datum -> Ap Maybe (HashMap Name Datum, List Datum)
+  matchPrefix ps es = fold $ alignWith f ps es
+    where
+      f (These a b) = (,[]) <$> match' a b
+      f (This a) = empty
+      f (That b) = pure (mempty,[b])
+  
+  matches
+    :: (Semialign f, Foldable f)
+    => f Pat -> f Datum -> Ap Maybe (HashMap Name Datum)
+  matches ps es = fold $ alignWith matchThese ps es
+  
+  matchThese (These a b) = match' a b
+  matchThese _ = empty
+
+
+
+-- | this hashmap is "curried" since we often want to traverse the
+-- entire set of scopes associated with a given symbol.
+newtype SymTable = MkSymTable
+  { curried :: HashMap Name (HashMap (HashSet Scope) Bind) }
+  deriving (Show, Generic)
+
+type instance Index SymTable = Name
+type instance IxValue SymTable = HashMap (HashSet Scope) Bind
+instance Ixed SymTable where ix j = #curried . ix j
+instance At SymTable where at j = #curried . at j
+
+instance Semigroup SymTable where
+  MkSymTable c1 <> MkSymTable c2 = MkSymTable $ H.unionWith (<>) c1 c2
+
+instance Monoid SymTable where mempty = MkSymTable mempty
+
+type Expand es = (State SymTable :> es, GenSym :> es)
+
+runExpand :: SymTable -> Eff (State SymTable : GenSym : es) a -> Eff es (a, SymTable)
+runExpand tab = runGenSym . runStateLocal tab
+
+testExpand :: Datum -> IO (CommandOrDef, SymTable)
+testExpand = runJalmotIO . runExpand (symTableOfEnv env_scheme_base)
+  . expand env_scheme_base mempty
+
+-- | denotations
+data Denot
+  = DenotVar
+  | DenotMacro Trans
+  | DenotPrim Name
+  | DenotSyntax Datum
+  | DenotKeyword Name
+  deriving stock (Show, Generic)
+
+newtype Env = MkEnv { names :: HashMap Bind Denot }
+  deriving stock (Show, Generic)
+  deriving newtype (Semigroup, Monoid)
+
+-- | @(environment '(scheme base))@
+env_scheme_base :: Env
+env_scheme_base = MkEnv . fromList . fold $
+  [ [ (BindGlobal p, DenotPrim p) | p <- prims ]
+  , [ (BindGlobal "λ", DenotPrim "lambda")
+    ]
+  ]
+  where
+    prims =
+      [ "if"
+      , "lambda"
+      , "let"
+      , "let-syntax"
+      ]
+
+symTableOfEnv :: Env -> SymTable
+symTableOfEnv = ifoldMapOf (#names . itraversed) \cases
+  b@(BindGlobal n) d -> binding n mempty b
+
+type instance IxValue Env = Denot
+type instance Index Env = Bind
+
+instance Ixed Env where ix j = #names . ix j
+instance At Env where at j = #names . at j
+
+err :: Jalmot :> es => Text -> Eff es a
+err = throwError . EvalError
+
+run :: S.DatumGrammar a -> Datum -> Maybe a
+run g = preview #_Right . runPureEff . runJalmot . S.fromDatum g
+
+parsePrim :: S.DatumIso e => Name -> Datum -> Maybe (Prim e)
+parsePrim primname d = case primname of
+  "let" -> PrimLet <$> run prim_let d
+  "let-syntax" -> PrimLetSyntax <$> run prim_let_syntax d
+  "lambda" -> PrimLambda <$> run prim_lambda d
+  "if" -> PrimIf <$> run prim_if d
+
+emit :: (Monoid m, State m :> es) => m -> Eff es ()
+emit x = modify (<> x)
+
+binding :: Name -> HashSet Scope -> Bind -> SymTable
+binding sym scopes = MkSymTable . H.singleton sym . H.singleton scopes
+
+envOfVar :: Bind -> Env
+envOfVar = MkEnv . flip H.singleton DenotVar
+
+gensymLexical :: GenSym :> es => Name -> Eff es Bind
+gensymLexical symbol = do
+  identity <- gensym
+  pure $ BindLexical {symbol,identity}
+
+lookupSymbol
+  :: forall es. (State SymTable :> es, Jalmot :> es)
+  => Env -> HashSet Scope -> Name -> Eff es (Bind, Denot)
+lookupSymbol g scopes x = do
+  ss <- fmap fold . preuse @SymTable @(Eff es) $ ix x
+  case nearest (MkKey x scopes) (H.keys ss) of
+    [] -> err [i|심벌 #{x}는 정의되지 않다|]
+    (_:_:_) -> err [i|심벌 #{x}는 모호하다|]
+    [s] | Just b <- ss ^? ix s
+        , Just d <- g ^? ix b -> pure (b,d)
+        | otherwise -> error "unreachable"
+
+{- | Given a 'Key' and a collection of 'ScopeSet's, filter that
+collection down to the largest subsets of the 'Key'\'s scope set.
+This is our analogue of the lexical scoping rule which chooses the
+"nearest" binding of a variable when shadowing occurs.
+
+  - If no qualifying subsets are found, the name is not in scope.
+  - If one subset is found, we're on the happy path!
+  - If more than one subset is found, we're on the rarest and
+    saddest path: the reference is ambiguous.
+
+* Examples
+
+> (let ((x {A} 123))
+>   (λ (x {A,B})
+>     (let ((y {A,B,C} 456))
+>       x {A,B,C})))
+    
+>>> :seti -XOverloadedLists
+>>> :{
+nearest
+  (MkKey "x" [MkScope 0, MkScope 1, MkScope 2])
+  [ [MkScope 0]
+  , [MkScope 0, MkScope 1] ]
+:}
+-}
+nearest :: (Traversable f, Filterable f) => Key -> f ScopeSet -> List ScopeSet
+nearest (MkKey symbol scopes) =
+  mapMaybe (\x ->
+    if x `HS.isSubsetOf` scopes
+    then Just . Down $ Arg (length x) x
+    else Nothing)
+  -- 나쁨. 안 좋다. 안 좋아하야.
+  >>> Data.Foldable.toList >>> sort
+  >>> foldr (\cases
+    x [] -> [x]
+    x acc@(y:_) -> case x `compare` y of
+      LT -> acc
+      EQ -> x:acc
+      GT -> [x])
+    []
+  >>> fmap (\(Down (Arg _ x)) -> x)
+
+expand
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Datum -> Eff es CommandOrDef
+
+expand g scopes datum@(List (Symbol s : es)) = do
+  let s' = MkName s
+  (_,denot) <- lookupSymbol g scopes s'
+  case denot of
+    DenotVar -> Command . ExpApply (ExpVar s')
+      <$> traverse (expandAsExp g scopes) es
+    DenotPrim x -> expandPrim g scopes x datum
+    DenotMacro trans -> expandMacro g scopes trans datum
+
+-- 신기하지 않은 경우들
+expand g scopes datum = case datum of
+  List (x:xs) -> Command <$> (ExpApply <$> go x <*> traverse go xs)
+  Symbol s -> pure . Command . ExpVar . MkName $ s
+  Boolean b -> lit $ LitBool b
+  Number (Sci.floatingOrInteger -> Right n) -> lit $ LitInt n
+  where
+    go = expandAsExp g scopes
+    lit = pure . Command . ExpLit
+
+expandMacro
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Trans -> Datum -> Eff es CommandOrDef
+expandMacro g scopes trans datum = _
+
+expandPrim 
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Name -> Datum -> Eff es CommandOrDef
+expandPrim g scopes primName datum
+  | Just prim <- parsePrim @Datum primName datum
+  = case prim of
+    PrimLetSyntax (MkPrimLetSyntax bs [body]) -> do
+      scopes' <- flip HS.insert scopes <$> gensym
+      (rhss,g') <- (_2 %~ (g<>) . fold) . Prelude.unzip <$> for bs \(x,trans) ->
+        expandAsExp g scopes trans >>= \case
+          ExpSyntaxRules trans' ->
+            (trans',) <$> bindLexical scopes' x (DenotMacro trans')
+          e -> err [i|syntax-rules를 원하는데 이것 받는다: #{e}|]
+      Command <$> (ExpLetSyntax
+        (zip (bs ^.. each . _1) rhss)
+        <$> expandAsExp g' scopes' body
+        )
+    PrimLet (MkPrimLet Nothing bs [body]) -> do
+      scopes' <- flip HS.insert scopes <$> gensym
+      g' <- (g<>) . fold <$> for (bs ^.. each . _1) \x ->
+        bindLexical scopes' x DenotVar
+      Command <$> (ExpLet
+        <$> traverseOf (each . _2) (expandAsExp g scopes) bs
+        <*> expandAsExp g scopes' body)
+    PrimLambda (MkPrimLambda (FormalsFixed xs) [body]) -> do
+      scopes' <- flip HS.insert scopes <$> gensym
+      g' <- (g<>) . fold <$> for xs \x -> bindLexical scopes' x DenotVar
+      Command . ExpLambda xs <$> expandAsExp g' scopes' body
+    PrimIf (MkPrimIf c t f) ->
+      Command <$> (ExpIf
+        <$> expandAsExp g scopes c
+        <*> expandAsExp g scopes t
+        <*> traverse (expandAsExp g scopes) f
+        )
+  | otherwise = err [i|prim #{primName}에 잘못한 신택스: #{datum}|]
+
+expandAsExp
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Datum -> Eff es Exp
+expandAsExp g scopes d = expand g scopes d >>= intoExp
+
+bindLexical :: Expand es => ScopeSet -> Name -> Denot -> Eff es Env
+bindLexical scopes symbol denot = do
+  identity <- gensym
+  let bind = BindLexical {symbol,identity}
+  modify (<> binding symbol scopes bind)
+  pure $ MkEnv (H.singleton bind denot)
+
+intoExp :: Jalmot :> es => CommandOrDef -> Eff es Exp
+intoExp (Command e) = pure e
+intoExp (Begin es) = traverse intoExp es >>= \case
+  [] -> err "begin expression은 빔"
+  (x:xs) -> pure . ExpBegin $ x NE.:| xs
+
+
+
+trans_when :: Trans
+trans_when = MkTrans
+  { ellipsis = "..."
+  , keywords = []
+  , rules =
+    [ MkRule
+      (PatList
+        [ PatVar "when"
+        , PatVar "test"
+        , PatVar "body" ]
+        (Just [])
+        Nothing)
+      (TemList
+        [ El $ TemVar "if"
+        , El $ TemVar "test"
+        , El $ TemList
+          [ El $ TemVar "begin"
+          , Ellipsis $ TemVar "body"
+          ]
+          Nothing
+        ]
+        Nothing)
+    ]
+  }
+
+trans_and :: Trans
+trans_and = MkTrans
+  { ellipsis = "..."
+  , keywords = []
+  , rules =
+    [ MkRule
+        (PatList
+          [PatVar "and"]
+          Nothing
+          Nothing)
+        (TemLit (LitBool True))
+    , MkRule
+        (PatList
+          [PatVar "and", PatVar "x"]
+          Nothing
+          Nothing)
+        (TemVar "x")
+    , MkRule
+        (PatList
+          [PatVar "and", PatVar "x", PatVar "y"]
+          (Just [])
+          Nothing)
+        (TemList
+          [ El (TemVar "if")
+          , El (TemVar "x")
+          , El (TemList
+              [ El (TemVar "and")
+              , Ellipsis (TemVar "y")
+              ]
+              Nothing)
+          , El . TemLit . LitBool $ False
+          ]
+          Nothing)
+    ]
+  }

src/Gyehoek/Scheme/Expand/Old.hs

@@ -0,0 +1,536 @@
+{-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE TypeFamilies #-}
+module Gyehoek.Scheme.Expand.Old
+  (
+  ) where
+
+import Gyehoek.Sexp.Syntax
+import Gyehoek.Sexp qualified as S
+import Gyehoek.Prelude
+import Gyehoek.Scheme.Syntax hiding (Prim(..))
+import Gyehoek.Scheme.Syntax qualified as Scm
+import qualified Data.HashSet as HS
+import qualified Data.HashMap.Strict as H
+import Data.Foldable
+import Data.These
+import Data.Zip
+import Prelude hiding (filter, zip, mapMaybe)
+import qualified Data.List.NonEmpty as NE
+import Data.Monoid (Ap(Ap, getAp))
+import Gyehoek.Sexp.Grammar.Base ((:-)(..))
+import Control.Lens.Extras (is)
+import Control.Applicative (Alternative(..))
+import Gyehoek.GenSym
+import Data.HashSet.Lens (setOf)
+import Data.List (sort)
+import GHC.Exts (IsList(..))
+import Gyehoek.Jalmot
+import Data.Maybe (isNothing)
+import Data.Kind (Type)
+import Data.Traversable (for, mapAccumR)
+import Effectful.State.Dynamic
+import Witherable
+import Data.Semigroup (Arg(..))
+import Data.Ord (Down(..))
+import qualified Data.Scientific as Sci
+
+
+data Bind
+  = BindLexical { symbol :: Name, identity :: Natural }
+  | BindGlobal { symbol :: Name }
+  deriving stock (Generic, Eq, Show)
+  deriving anyclass (Hashable)
+
+newtype Scope = MkScope { identity :: Natural }
+  deriving stock (Show, Generic, Eq, Ord)
+  deriving anyclass (Hashable)
+  deriving newtype (Gen)
+
+type ScopeSet = HashSet Scope
+
+data Formals
+  = FormalsFixed (List Name)
+  | FormalsRest (List Name) Name
+  deriving (Show, Generic)
+
+data PrimLambda e = MkPrimLambda Formals (List e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+data PrimLet e = MkPrimLet (Maybe Name) (List (Name, e)) (List e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+data PrimIf e = MkPrimIf e e (Maybe e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+data PrimLetSyntax e = MkPrimLetSyntax (List (Name, e)) (List e)
+  deriving (Show, Generic, Functor, Foldable, Traversable)
+
+data Prim e
+  = PrimLambda (PrimLambda e)
+  | PrimLet (PrimLet e)
+  | PrimIf (PrimIf e)
+  | PrimLetSyntax (PrimLetSyntax e)
+  | PrimSyntaxRules Trans
+  deriving (Show, Generic)
+
+data Key = MkKey Name (HashSet Scope)
+  deriving stock (Show, Generic, Eq)
+  deriving anyclass (Hashable)
+
+
+
+instance S.DatumIso Scope where
+  datumIso = S.with (S.datumIso >>>)
+
+hashSetGrammar
+  :: forall a. (Hashable a, Ord a)
+  => S.DatumGrammar a -> S.DatumGrammar (HashSet a)
+hashSetGrammar g =
+  S.list (S.rest g)
+  >>> S.iso HS.fromList (sort . HS.toList)
+
+instance S.DatumIso Key where
+  datumIso = S.with \g ->
+    S.list
+      ( S.el (S.sym "@")
+      >>> S.el (S.datumIso @Name)
+      >>> S.el (hashSetGrammar S.datumIso)
+      )
+    >>> g
+
+instance S.DatumIso Formals where
+  datumIso = S.match
+    $ S.With (fixed >>>)
+    $ S.With (rest >>>)
+    $ S.End
+    where
+      fixed :: S.G (Datum :- t) (List Name :- t)
+      fixed = S.list $ S.rest $ S.datumIso @Name
+      rest :: S.G (Datum :- t) (Name :- List Name :- t)
+      rest = S.coproduct
+        [ S.dottedList (S.rest $ S.datumIso @Name) (S.datumIso @Name)
+        , S.datumIso @Name >>> S.onTail (S.push [] null (const mempty))
+        ]
+
+optEl
+  :: S.G (S.Datum :- t) (a :- t)
+  -> S.G (S.ListContext :- t) (S.ListContext :- Maybe a :- t)
+optEl g =
+  S.coproduct
+    [ S.el g >>> S.onTail (S.partialIso Just \case
+      Nothing -> Left mempty
+      Just x -> Right x)
+    , S.onTail $ S.push Nothing isNothing (const mempty)
+    ]
+
+anykw :: Text -> S.G (Datum :- t) t
+anykw s = S.Flip $ S.PartialIso
+  (\t -> adorn SynBuiltin (Symbol s) :- t)
+  \case
+    (Symbol _ :- t) -> Right t
+    _ -> Left $ S.expected "symbol"
+
+prim_if :: S.DatumIso e => S.DatumGrammar (PrimIf e)
+prim_if = S.with \g ->
+  S.listWithStyle (StyleSyntax 1)
+    (S.el (anykw "if")
+    >>> S.el S.datumIso
+    >>> S.el S.datumIso
+    >>> optEl S.datumIso)
+  >>> g
+
+prim_lambda :: S.DatumIso e => S.DatumGrammar (PrimLambda e)
+prim_lambda = S.with \g ->
+  S.lambdaLike (anykw "λ") (S.datumIso @Formals) (S.rest S.datumIso)
+  >>> g
+
+prim_let
+  :: forall e. S.DatumIso e => S.DatumGrammar (PrimLet e)
+prim_let = S.with \g ->
+  (S.listWithStyle (StyleSyntax 1) $
+    S.el (anykw "let")
+    >>> optEl (S.datumIso @Name)
+    >>> S.el (S.list $ S.rest $ S.datumIso @(Name,e))
+    >>> S.rest S.datumIso)
+  >>> g
+
+prim_let_syntax :: S.DatumIso e => S.DatumGrammar (PrimLetSyntax e)
+prim_let_syntax = S.with \g ->
+  (S.listWithStyle (StyleSyntax 1) $
+    S.el (anykw "let-syntax")
+    >>> S.el (S.list $ S.rest $ S.datumIso)
+    >>> S.rest S.datumIso)
+  >>> g
+
+instance S.DatumIso Bind where
+  datumIso = S.match
+    $ S.With (\g ->
+      S.list (S.el (S.sym "L") >>> S.el S.datumIso >>> S.el S.datumIso)
+      >>> g)
+    $ S.With (\g ->
+      S.list (S.el (S.sym "G") >>> S.el S.datumIso)
+      >>> g)
+    $ S.End
+
+
+
+{- |
+
+* Examples
+
+>>> :set -XTemplateHaskellQuotes
+>>> pat = S.makeSx [|| S.fromDatumUnsafe @Pat S.datumIso ||]
+>>> match [] [pat|(x . y)|] [S.sx|(1 2 . 2)|]
+Nothing
+>>> match [] [pat|(x . y)|] [S.sx|(1 . 2)|]
+Just
+...
+>>> match ["=>"] [pat|(x => y)|] [S.sx|(1 => 2)|]
+Just
+...
+>>> match ["=>"] [pat|(x => y)|] [S.sx|(1 -> 2)|]
+Nothing
+-}
+match :: Foldable f
+  => f Text
+  -- ^ Literal keywords
+  -> Pat
+  -> Datum
+  -> Maybe (HashMap Name Datum)
+match kws p = getAp . match' p where
+
+  match' :: Pat -> Datum -> Ap Maybe (HashMap Name Datum)
+  
+  match' PatWildcard _ = pure mempty
+  
+  match' (PatVar x) e
+    | coerce x `elem` kws = case e of
+      Symbol x' | coerce x == x' -> pure mempty
+      _                          -> empty
+    | otherwise = pure $ H.singleton x e
+  
+  match' (PatList ps Nothing Nothing) (List es) = matches ps es
+  
+  match' (PatList ps (Just []) Nothing) (List es) = do
+    let (ps',p) = ps ^?! _Snoc
+    (r,rest) <- fold $ alignWith f ps' es
+    rest' <- rest
+      & fmap (fmap (fmap (:[])) . match' p)
+      & foldr (liftA2 $ H.unionWith (<>)) mempty
+      & fmap (fmap List)
+    pure $ r <> rest'
+    where
+      f (These a b) = (,[]) <$> match' a b
+      f (This a) = empty
+      f (That b) = pure (mempty,[b])
+  
+  match' (PatList ps Nothing (Just p)) (DotList es e) =
+    matches (p:|ps) (NE.cons e es)
+  
+  match' _ _ = _
+  
+  matchPrefix
+    :: (Semialign f, Foldable f)
+    => f Pat -> f Datum -> Ap Maybe (HashMap Name Datum, List Datum)
+  matchPrefix ps es = fold $ alignWith f ps es
+    where
+      f (These a b) = (,[]) <$> match' a b
+      f (This a) = empty
+      f (That b) = pure (mempty,[b])
+  
+  matches
+    :: (Semialign f, Foldable f)
+    => f Pat -> f Datum -> Ap Maybe (HashMap Name Datum)
+  matches ps es = fold $ alignWith matchThese ps es
+  
+  matchThese (These a b) = match' a b
+  matchThese _ = empty
+
+
+
+-- | this hashmap is "curried" since we often want to traverse the
+-- entire set of scopes associated with a given symbol.
+newtype SymTable = MkSymTable
+  { curried :: HashMap Name (HashMap (HashSet Scope) Bind) }
+  deriving (Show, Generic)
+
+type instance Index SymTable = Name
+type instance IxValue SymTable = HashMap (HashSet Scope) Bind
+instance Ixed SymTable where ix j = #curried . ix j
+instance At SymTable where at j = #curried . at j
+
+instance Semigroup SymTable where
+  MkSymTable c1 <> MkSymTable c2 = MkSymTable $ H.unionWith (<>) c1 c2
+
+instance Monoid SymTable where mempty = MkSymTable mempty
+
+type Expand es = (State SymTable :> es, GenSym :> es)
+
+runExpand :: SymTable -> Eff (State SymTable : GenSym : es) a -> Eff es (a, SymTable)
+runExpand tab = runGenSym . runStateLocal tab
+
+testExpand :: Datum -> IO (CommandOrDef, SymTable)
+testExpand = runJalmotIO . runExpand (symTableOfEnv env_scheme_base)
+  . expand env_scheme_base mempty
+
+-- | denotations
+data Denot
+  = DenotVar
+  | DenotMacro Trans
+  | DenotPrim Name
+  | DenotSyntax Datum
+  | DenotKeyword Name
+  deriving stock (Show, Generic)
+
+newtype Env = MkEnv { names :: HashMap Bind Denot }
+  deriving stock (Show, Generic)
+  deriving newtype (Semigroup, Monoid)
+
+-- | @(environment '(scheme base))@
+env_scheme_base :: Env
+env_scheme_base = MkEnv . fromList . fold $
+  [ [ (BindGlobal p, DenotPrim p) | p <- prims ]
+  , [ (BindGlobal "λ", DenotPrim "lambda")
+    ]
+  ]
+  where
+    prims =
+      [ "if"
+      , "lambda"
+      , "let"
+      , "let-syntax"
+      ]
+
+symTableOfEnv :: Env -> SymTable
+symTableOfEnv = ifoldMapOf (#names . itraversed) \cases
+  b@(BindGlobal n) d -> binding n mempty b
+
+type instance IxValue Env = Denot
+type instance Index Env = Bind
+
+instance Ixed Env where ix j = #names . ix j
+instance At Env where at j = #names . at j
+
+err :: Jalmot :> es => Text -> Eff es a
+err = throwError . EvalError
+
+run :: S.DatumGrammar a -> Datum -> Maybe a
+run g = preview #_Right . runPureEff . runJalmot . S.fromDatum g
+
+parsePrim :: S.DatumIso e => Name -> Datum -> Maybe (Prim e)
+parsePrim primname d = case primname of
+  "let" -> PrimLet <$> run prim_let d
+  "let-syntax" -> PrimLetSyntax <$> run prim_let_syntax d
+  "lambda" -> PrimLambda <$> run prim_lambda d
+  "if" -> PrimIf <$> run prim_if d
+
+emit :: (Monoid m, State m :> es) => m -> Eff es ()
+emit x = modify (<> x)
+
+binding :: Name -> HashSet Scope -> Bind -> SymTable
+binding sym scopes = MkSymTable . H.singleton sym . H.singleton scopes
+
+envOfVar :: Bind -> Env
+envOfVar = MkEnv . flip H.singleton DenotVar
+
+gensymLexical :: GenSym :> es => Name -> Eff es Bind
+gensymLexical symbol = do
+  identity <- gensym
+  pure $ BindLexical {symbol,identity}
+
+lookupSymbol
+  :: forall es. (State SymTable :> es, Jalmot :> es)
+  => Env -> HashSet Scope -> Name -> Eff es (Bind, Denot)
+lookupSymbol g scopes x = do
+  ss <- fmap fold . preuse @SymTable @(Eff es) $ ix x
+  case nearest (MkKey x scopes) (H.keys ss) of
+    [] -> err [i|심벌 #{x}는 정의되지 않다|]
+    (_:_:_) -> err [i|심벌 #{x}는 모호하다|]
+    [s] | Just b <- ss ^? ix s
+        , Just d <- g ^? ix b -> pure (b,d)
+        | otherwise -> error "unreachable"
+
+{- | Given a 'Key' and a collection of 'ScopeSet's, filter that
+collection down to the largest subsets of the 'Key'\'s scope set.
+This is our analogue of the lexical scoping rule which chooses the
+"nearest" binding of a variable when shadowing occurs.
+
+  - If no qualifying subsets are found, the name is not in scope.
+  - If one subset is found, we're on the happy path!
+  - If more than one subset is found, we're on the rarest and
+    saddest path: the reference is ambiguous.
+
+* Examples
+
+> (let ((x {A} 123))
+>   (λ (x {A,B})
+>     (let ((y {A,B,C} 456))
+>       x {A,B,C})))
+    
+>>> :seti -XOverloadedLists
+>>> :{
+nearest
+  (MkKey "x" [MkScope 0, MkScope 1, MkScope 2])
+  [ [MkScope 0]
+  , [MkScope 0, MkScope 1] ]
+:}
+-}
+nearest :: (Traversable f, Filterable f) => Key -> f ScopeSet -> List ScopeSet
+nearest (MkKey symbol scopes) =
+  mapMaybe (\x ->
+    if x `HS.isSubsetOf` scopes
+    then Just . Down $ Arg (length x) x
+    else Nothing)
+  -- 나쁨. 안 좋다. 안 좋아하야.
+  >>> Data.Foldable.toList >>> sort
+  >>> foldr (\cases
+    x [] -> [x]
+    x acc@(y:_) -> case x `compare` y of
+      LT -> acc
+      EQ -> x:acc
+      GT -> [x])
+    []
+  >>> fmap (\(Down (Arg _ x)) -> x)
+
+expand
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Datum -> Eff es CommandOrDef
+
+expand g scopes datum@(List (Symbol s : es)) = do
+  let s' = MkName s
+  (_,denot) <- lookupSymbol g scopes s'
+  case denot of
+    DenotVar -> Command . ExpApply (ExpVar s')
+      <$> traverse (expandAsExp g scopes) es
+    DenotPrim x -> expandPrim g scopes x datum
+    DenotMacro trans -> expandMacro g scopes trans datum
+
+-- 신기하지 않은 경우들
+expand g scopes datum = case datum of
+  List (x:xs) -> Command <$> (ExpApply <$> go x <*> traverse go xs)
+  Symbol s -> pure . Command . ExpVar . MkName $ s
+  Boolean b -> lit $ LitBool b
+  Number (Sci.floatingOrInteger -> Right n) -> lit $ LitInt n
+  where
+    go = expandAsExp g scopes
+    lit = pure . Command . ExpLit
+
+expandMacro
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Trans -> Datum -> Eff es CommandOrDef
+expandMacro g scopes trans datum = _
+
+expandPrim 
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Name -> Datum -> Eff es CommandOrDef
+expandPrim g scopes primName datum
+  | Just prim <- parsePrim @Datum primName datum
+  = case prim of
+    PrimLetSyntax (MkPrimLetSyntax bs [body]) -> do
+      scopes' <- flip HS.insert scopes <$> gensym
+      (rhss,g') <- (_2 %~ (g<>) . fold) . Prelude.unzip <$> for bs \(x,trans) ->
+        expandAsExp g scopes trans >>= \case
+          ExpSyntaxRules trans' ->
+            (trans',) <$> bindLexical scopes' x (DenotMacro trans')
+          e -> err [i|syntax-rules를 원하는데 이것 받는다: #{e}|]
+      Command <$> (ExpLetSyntax
+        (zip (bs ^.. each . _1) rhss)
+        <$> expandAsExp g' scopes' body
+        )
+    PrimLet (MkPrimLet Nothing bs [body]) -> do
+      scopes' <- flip HS.insert scopes <$> gensym
+      g' <- (g<>) . fold <$> for (bs ^.. each . _1) \x ->
+        bindLexical scopes' x DenotVar
+      Command <$> (ExpLet
+        <$> traverseOf (each . _2) (expandAsExp g scopes) bs
+        <*> expandAsExp g scopes' body)
+    PrimLambda (MkPrimLambda (FormalsFixed xs) [body]) -> do
+      scopes' <- flip HS.insert scopes <$> gensym
+      g' <- (g<>) . fold <$> for xs \x -> bindLexical scopes' x DenotVar
+      Command . ExpLambda xs <$> expandAsExp g' scopes' body
+    PrimIf (MkPrimIf c t f) ->
+      Command <$> (ExpIf
+        <$> expandAsExp g scopes c
+        <*> expandAsExp g scopes t
+        <*> traverse (expandAsExp g scopes) f
+        )
+  | otherwise = err [i|prim #{primName}에 잘못한 신택스: #{datum}|]
+
+expandAsExp
+  :: (Expand es, Jalmot :> es)
+  => Env -> ScopeSet -> Datum -> Eff es Exp
+expandAsExp g scopes d = expand g scopes d >>= intoExp
+
+bindLexical :: Expand es => ScopeSet -> Name -> Denot -> Eff es Env
+bindLexical scopes symbol denot = do
+  identity <- gensym
+  let bind = BindLexical {symbol,identity}
+  modify (<> binding symbol scopes bind)
+  pure $ MkEnv (H.singleton bind denot)
+
+intoExp :: Jalmot :> es => CommandOrDef -> Eff es Exp
+intoExp (Command e) = pure e
+intoExp (Begin es) = traverse intoExp es >>= \case
+  [] -> err "begin expression은 빔"
+  (x:xs) -> pure . ExpBegin $ x NE.:| xs
+
+
+
+trans_when :: Trans
+trans_when = MkTrans
+  { ellipsis = "..."
+  , keywords = []
+  , rules =
+    [ MkRule
+      (PatList
+        [ PatVar "when"
+        , PatVar "test"
+        , PatVar "body" ]
+        (Just [])
+        Nothing)
+      (TemList
+        [ El $ TemVar "if"
+        , El $ TemVar "test"
+        , El $ TemList
+          [ El $ TemVar "begin"
+          , Ellipsis $ TemVar "body"
+          ]
+          Nothing
+        ]
+        Nothing)
+    ]
+  }
+
+trans_and :: Trans
+trans_and = MkTrans
+  { ellipsis = "..."
+  , keywords = []
+  , rules =
+    [ MkRule
+        (PatList
+          [PatVar "and"]
+          Nothing
+          Nothing)
+        (TemLit (LitBool True))
+    , MkRule
+        (PatList
+          [PatVar "and", PatVar "x"]
+          Nothing
+          Nothing)
+        (TemVar "x")
+    , MkRule
+        (PatList
+          [PatVar "and", PatVar "x", PatVar "y"]
+          (Just [])
+          Nothing)
+        (TemList
+          [ El (TemVar "if")
+          , El (TemVar "x")
+          , El (TemList
+              [ El (TemVar "and")
+              , Ellipsis (TemVar "y")
+              ]
+              Nothing)
+          , El . TemLit . LitBool $ False
+          ]
+          Nothing)
+    ]
+  }

src/Gyehoek/Scheme/Syntax.hs

@@ -11,16 +11,23 @@
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE ViewPatterns #-}
+{- HLINT ignore "Avoid lambda using `infix`" -}
+{- HLINT ignore "Redundant $" -}
 module Gyehoek.Scheme.Syntax
   ( Name(..)
-  , Prim(..)
+  , Builtin(..)
   , Lit(..)
   , Def(..)
   , Exp(..)
   , ExpF(..)
   , Program(..)
   , CommandOrDef(..)
-  , primDatumIso
+  , Trans(..)
+  , Rule(..)
+  , Pat(..)
+  , Tem(..)
+  , El(..)
+  , builtinDatumIso
   , free
   , subst
   , getName
@@ -31,8 +38,6 @@ module Gyehoek.Scheme.Syntax
   )
   where
 
-import Data.List (intersperse)
-import Effectful
 import Prelude hiding ((.), id)
 import Control.Category
 import Gyehoek.Sexp qualified as GS
@@ -45,12 +50,7 @@ import Data.Functor.Foldable hiding (fold)
 import qualified Data.HashSet as HS
 import Data.Foldable (fold, toList)
 import Language.Haskell.TH.Quote (QuasiQuoter)
-import Effectful.FileSystem (runFileSystem)
-import qualified Effectful.FileSystem.IO as FS
-import qualified Data.Text.Encoding as T
-import qualified Effectful.FileSystem.IO.ByteString as FB
 import qualified Data.Set.Ordered as O
-import Gyehoek.Sexp.Grammar qualified as Sexp
 import Gyehoek.Sexp.Grammar qualified as S
 import Gyehoek.Sexp.Grammar (DatumIso, G, DataIso, (:-)((:-)))
 import Gyehoek.Prelude
@@ -69,36 +69,36 @@ instance Prefixed Name where
 getName :: Name -> Text
 getName (MkName x) = x
 
-data Prim e
-  = PrimAdd e e
-  | PrimSub e e
-  | PrimMul e e
-  | PrimDiv e e
-  | PrimCons e e
-  | PrimCar e
-  | PrimCdr e
-  | PrimImmediateP e
-  | PrimConsP e
-  | PrimIntegerP e
-  | PrimWrite e
-  | PrimZeroP e
-  | PrimNewline
-  | PrimMakeClosure { code :: e, env :: List e }
-  | PrimMakeSharedClosure { codes :: List e, env :: List e }
-  | PrimGetEnv
-  | PrimEnv
-  | PrimEnvRef Int
-  | PrimCallCC e
-  | PrimCaptureCC
-  | PrimInvokeCC e (List e)
-  | PrimValues (List e)
-  | PrimCallWithValues e e
-  | PrimPairP e
-  | PrimList (List e)
+data Builtin e
+  = BuiltinAdd e e
+  | BuiltinSub e e
+  | BuiltinMul e e
+  | BuiltinDiv e e
+  | BuiltinCons e e
+  | BuiltinCar e
+  | BuiltinCdr e
+  | BuiltinImmediateP e
+  | BuiltinConsP e
+  | BuiltinIntegerP e
+  | BuiltinWrite e
+  | BuiltinZeroP e
+  | BuiltinNewline
+  | BuiltinMakeClosure { code :: e, env :: List e }
+  | BuiltinMakeSharedClosure { codes :: List e, env :: List e }
+  | BuiltinGetEnv
+  | BuiltinEnv
+  | BuiltinEnvRef Int
+  | BuiltinCallCC e
+  | BuiltinCaptureCC
+  | BuiltinInvokeCC e (List e)
+  | BuiltinValues (List e)
+  | BuiltinCallWithValues e e
+  | BuiltinPairP e
+  | BuiltinList (List e)
   deriving stock (Show, Generic, Functor, Foldable, Traversable, Data, Eq)
   deriving anyclass (NFData)
 
-instance Each (Prim e) (Prim e') e e'
+instance Each (Builtin e) (Builtin e') e e'
 
 data Lit
   = LitInt Int
@@ -113,19 +113,79 @@ data Def
   deriving stock (Show, Generic, Data)
   deriving anyclass (NFData)
 
+data Formals a
+  = FormalsFixed (List a)
+  | FormalsVar (List a) a
+  deriving stock (Show, Generic, Data, Functor, Foldable, Traversable)
+  deriving anyclass (NFData)
+
 data Exp
   = ExpLet (List (Name, Exp)) Exp
+  | ExpLetSyntax (List (Name, Trans)) Exp
   | ExpLetRec (List (Name, Exp)) Exp
-  | ExpPrim (Prim Exp)
+  | ExpBuiltin (Builtin Exp)
   | ExpBegin (NonEmpty Exp)
-  | ExpIf Exp Exp Exp
+  | ExpIf Exp Exp (Maybe Exp)
   | ExpLit Lit
   | ExpLambda (List Name) Exp
   | ExpVar Name
+  | ExpSyntaxRules Trans
   | ExpApply Exp (List Exp)
   deriving stock (Show, Generic, Data)
   deriving anyclass (NFData)
 
+data Trans = MkTrans
+  { ellipsis :: Name
+  , keywords :: List Name
+  , rules :: List Rule
+  }
+  deriving stock (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Rule = MkRule
+  { rhs :: Pat
+  , lhs :: Tem
+  }
+  deriving (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Pat
+  = PatWildcard
+  | PatVar Name
+  | PatList
+    { init :: List Pat
+    , ellipsis :: Maybe (List Pat)
+    , tail :: Maybe Pat
+    }
+  -- | PatVec
+  --   { init :: List Pat
+  --   , ellipsis :: Maybe (List Pat)
+  --   }
+  deriving (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Tem
+  -- | @(⟨element⟩ …)@
+  -- @(⟨element⟩ ⟨element⟩ … . ⟨element⟩)@
+  = TemList
+    { init :: List El
+    , tail :: Maybe Tem
+    }
+  -- | @(⟨ellipsis⟩ ⟨template⟩)@
+  | TemTrail Tem
+  | TemLit Lit
+  | TemVar Name
+  deriving (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data El
+  -- | @⟨template⟩ ⟨ellipsis⟩@
+  = Ellipsis Tem
+  -- | @⟨template⟩@
+  | El Tem
+  deriving (Show, Generic, Data)
+  deriving anyclass (NFData)
+
 data CommandOrDef
   = Command Exp
   | Definition Def
@@ -182,14 +242,12 @@ makeBaseFunctor ''Exp
 
 
 instance DatumIso Name where
-  datumIso = S.decorate S.SynVariable
-    >>> S.symbol
-    >>> S.iso coerce coerce
+  datumIso = S.symbol >>> S.iso coerce coerce
 
-primDatumIso
+builtinDatumIso
   :: (Text -> Text)
-  -> S.DatumGrammar a -> S.DatumGrammar (Prim a)
-primDatumIso namefn a = S.match
+  -> S.DatumGrammar a -> S.DatumGrammar (Builtin a)
+builtinDatumIso namefn a = S.match
     $ S.With (. ht2 "+")
     $ S.With (. ht2 "-")
     $ S.With (. ht2 "*")
@@ -226,8 +284,8 @@ primDatumIso namefn a = S.match
       ht1' s = S.headTagged1' (namefn s) a a
       ht0' s = S.headTagged0' (namefn s) a
 
-instance DatumIso a => DatumIso (Prim a) where
-  datumIso = primDatumIso id S.datumIso
+instance DatumIso a => DatumIso (Builtin a) where
+  datumIso = builtinDatumIso id S.datumIso
 
 instance DatumIso Lit where
   datumIso = S.match
@@ -248,20 +306,42 @@ instance DatumIso Def where
         >>> S.el args >>> S.rest S.datumIso
       args = S.list $ S.el S.datumIso >>> S.rest S.datumIso
   
+instance DatumIso Trans where
+  datumIso = S.with \g ->
+    S.listWithStyle
+      (S.StyleSyntax 1)
+      ( S.el (S.sym "syntax-rules")
+      >>> S.Iso (\(ctx:-t) -> ctx:-"...":-t) (\(ctx:-_:-t) -> ctx:-t)
+      >>> S.el (S.list $ S.rest (S.datumIso @Name))
+      >>> S.rest (S.datumIso @Rule)
+      )
+    >>> g
+
 instance DatumIso Exp where
   datumIso = S.match
     $ S.With (. S.letLike "let" S.datumIso S.datumIso S.datumIso)
+    $ S.With (letsyntax >>>)
     $ S.With (. S.letLike "letrec" S.datumIso S.datumIso S.datumIso)
     $ S.With (. S.datumIso)
     $ S.With (. begin)
-    $ S.With (. S.ifLike "if" S.datumIso S.datumIso S.datumIso)
+    $ S.With (. if_)
     $ S.With (. S.datumIso)
     $ S.With (. lam)
     $ S.With (. S.datumIso)
+    $ S.With (. S.datumIso)
     $ S.With (\app -> app . S.list (S.el S.datumIso >>> S.rest S.datumIso))
     $ S.End
     where
+      letsyntax = S.listWithStyle (S.StyleSyntax 1) $
+        S.el (S.sym "let-syntax")
+        >>> S.el (S.list $ S.rest $ S.datumIso)
+        >>> S.el S.datumIso
       lam = S.lambdaLike S.lambdaKeyword S.datumIso (S.el S.datumIso)
+      if_ = S.ifLike "if" S.datumIso S.datumIso $ S.datumIso @Exp >>> S.iso
+        Just
+        \case
+          Just x -> x
+          Nothing -> error "안 괜찮다ㅠㅠ"
       begin :: forall t. G (S.Datum :- t) (NonEmpty Exp :- t)
       begin = S.beginLike "begin" $
         S.el (S.datumIso @Exp) >>> S.rest (S.datumIso @Exp)
@@ -269,6 +349,101 @@ instance DatumIso Exp where
           (\(xs:-x:-t) -> (x:|xs):-t)
           (\((x:|xs):-t) -> xs:-x:-t))
 
+instance S.DatumIso Rule where
+  datumIso = S.with \g ->
+    S.list (S.el S.datumIso >>> S.el S.datumIso) >>> g
+
+instance S.DatumIso Pat where
+  datumIso = S.match
+    $ S.With (S.sym "_" >>>)
+    $ S.With (S.datumIso >>>)
+    $ S.With (lst >>>)
+    $ S.End
+    where
+      lst :: S.G (S.Datum :- t) (Maybe Pat :- Maybe (List Pat) :- List Pat :- t)
+      lst = S.coproduct
+        [ S.list $
+            ellipsis
+            >>> S.onTail (S.push Nothing (is _Nothing) (const mempty))
+        , S.dottedList
+            ellipsis
+            ( S.datumIso @Pat
+              >>> S.partialIso Just (maybe (Left mempty) Right) )
+        ]
+      ellipsis =
+        S.restData split
+            >>> S.onTail
+              ( S.onHead (S.traversed . S.traversed . S.sealed $
+                S.datumIso @Pat)
+              >>> S.onTail (S.onHead . S.traversed . S.sealed $
+                S.datumIso @Pat)
+              )
+      split
+        :: forall t. S.G (List S.Datum :- t)
+            (Maybe (List S.Datum) :- List S.Datum :- t)
+      split = S.Iso
+        (\(ps0:-t) ->
+          let (ps,ell) = splitEllipsis ps0
+          in ell :- ps :- t)
+        (\(ell:-ps:-t) -> (ps ++ foldMap ([S.Symbol "..."]++) ell) :- t)
+
+splitEllipsis :: List S.Datum -> (List S.Datum, Maybe (List S.Datum))
+splitEllipsis [] = ([], Nothing)
+splitEllipsis (S.Symbol "..." : xs) = ([], Just xs)
+splitEllipsis (x:xs) = splitEllipsis xs & _1 %~ (x:)
+
+instance S.DataIso El where
+  dataIso = S.match
+    $ S.With (ellipsis >>>)
+    $ S.With (noellipsis >>>)
+    $ S.End
+    where
+      ellipsis = S.recontextualise $
+        S.el (S.datumIso @Tem) >>> S.el (S.sym "...")
+      noellipsis = S.recontextualise $ S.el (S.datumIso @Tem)
+
+instance S.DatumIso Tem where
+  datumIso = S.match
+    $ S.With (lst >>>)
+    $ S.With (trail >>>)
+    $ S.With (S.datumIso @Lit >>>)
+    $ S.With (S.datumIso @Name >>>)
+    $ S.End
+    where
+      trail = S.list $ S.el (S.sym "...") >>> S.el (S.datumIso @Tem)
+
+      lst :: S.G (S.Datum :- t) (Maybe Tem :- List El :- t)
+      lst = S.coproduct
+        [ S.list els
+          >>> (S.push Nothing (is _Nothing) (const mempty))
+        , S.dottedList els $
+            S.datumIso @Tem
+            >>> S.partialIso Just (maybe (Left mempty) Right)
+        ]
+      els :: S.G (S.ListContext :- t) (S.ListContext :- List El :- t)
+      els =
+        S.iso
+          (\(S.MkListContext ds) -> affixEllipses ds)
+          (S.MkListContext . foldMap \(d,b) ->
+            d : if b then [S.Symbol "..."] else [])
+        >>> S.onHead (S.traversed . S.sealed $
+          S.flipped S.pair
+          >>> S.onTail (S.datumIso @Tem)
+          >>> S.pair
+          >>> S.iso
+            (\(t,b) -> if b then Ellipsis t else El t)
+            (\case
+              Ellipsis t -> (t,True)
+              El t -> (t,False)))
+        >>> S.push (S.MkListContext [])
+          (\(S.MkListContext xs) -> null xs)
+          (const mempty)
+      affixEllipses :: List S.Datum -> List (S.Datum, Bool)
+      affixEllipses (x : S.Symbol "..." : xs) = (x,True) : affixEllipses xs
+      affixEllipses (x : xs) = (x,False) : affixEllipses xs
+      affixEllipses [] = []
+
+
 instance DatumIso CommandOrDef where
   datumIso = S.match
     $ S.With (\_Command -> _Command . S.datumIso)
@@ -299,16 +474,16 @@ instance DatumIso ImportSet where
     $ S.With (imp "rename" >>>)
     $ S.End
     where
-      imp s = S.list $ S.el (S.symBuiltin s)
+      imp s = S.list $ S.el (S.sym s)
         >>> S.el S.datumIso >>> S.restData S.dataIso
       imp' s = S.list $
-        S.el (S.symBuiltin s)
+        S.el (S.sym s)
         >>> S.el S.datumIso
         >>> S.el S.datumIso
 
 instance DatumIso ImportDecl where
   datumIso = S.with \decl ->
-    S.list (S.el (S.symBuiltin "import") >>> S.restData S.dataIso)
+    S.list (S.el (S.sym "import") >>> S.restData S.dataIso)
     >>> decl
 
 instance DataIso Program where

src/Gyehoek/Sexp/Grammar.hs

@@ -179,6 +179,14 @@ instance DatumIso Bool where datumIso = boolean
 
 instance DatumIso Int where datumIso = int
 
+instance DatumIso Natural where
+  datumIso = int
+    >>> partialOsi
+      (\x -> if x < 0
+        then Left $ expected "non-negative integer" <> unexpected [i|#{x}|]
+        else Right $ fromIntegral x)
+      fromIntegral
+
 instance DatumIso Datum where datumIso = Control.Category.id
 
 instance DatumIso a => DataIso (List a) where

src/Gyehoek/Sexp/Grammar/Base.hs

@@ -1,3 +1,4 @@
+{- HLINT ignore "Avoid lambda" -}
 -- | cribbed from sexp-grammar:Language.SexpGrammar.Base
 module Gyehoek.Sexp.Grammar.Base
   ( module Gyehoek.Sexp.Syntax
@@ -8,12 +9,11 @@ module Gyehoek.Sexp.Grammar.Base
   , Grammar(..)
   , DatumGrammar
   , DataGrammar
-  , Grammar
   , ListContext(..)
   , (:-)((:-))
   -- * lists
   , list
-  , listWithIndentation
+  , listWithStyle
   , el
   , rest
   , restData
@@ -23,6 +23,7 @@ module Gyehoek.Sexp.Grammar.Base
   , headTagged1'
   , headTagged1
   , headTagged2
+  , headTagged2'
   -- * atoms
   , simple
   , string
@@ -33,32 +34,29 @@ module Gyehoek.Sexp.Grammar.Base
   , integer
   , int
   , unreadable
-  -- ** symbols
-  , symBuiltin
   -- * TODO: sort lol
   , prismIso
-  , isoIso, decorate
+  , isoIso
   , snoced
   , letLike
   , ifLike
   , lambdaLike
   , lambdaKeyword
   , kappaKeyword
-  , beginLike, headTagged2', dottedList
+  , beginLike
+  , dottedList
+  , reifyContext, recontextualise, decontextualise, redecorate
   ) where
 
 import Data.InvertibleGrammar
 import Data.InvertibleGrammar.Base
-import Data.InvertibleGrammar.Base as Re
-  ( Grammar(..))
 import Data.InvertibleGrammar.Combinators
-import Gyehoek.Prelude hiding (traversed, iso, cons, coerced, Iso, Simple, simple)
+import Gyehoek.Prelude hiding (flipped, traversed, iso, cons, coerced, Iso, Simple, simple)
 import Gyehoek.Sexp.Syntax hiding (position)
 import Gyehoek.Sexp.Print (printDatum')
 import Data.Scientific (Scientific)
 import qualified Data.Scientific as Sci
 import qualified Data.Text as T
-import Control.Monad.RWS (modify)
 import qualified Data.List.NonEmpty as NE
 import Data.Foldable (toList)
 
@@ -89,14 +87,6 @@ locate =
     (\(_ :- t) -> t)
     (\t -> noAnn :- t)
 
-modifyAnn :: (Ann -> Ann) -> G (Datum :- t) (Datum :- t)
-modifyAnn f = Iso
-  (\(d:-t) -> (d & ann %~ f) :- t)
-  (\(d:-t) -> (d & ann %~ f) :- t)
-
-decorate :: Syn -> G (Datum :- t) (Datum :- t)
-decorate s = modifyAnn $ #syntax .~ s
-
 newtype ListContext = MkListContext { inner :: List Datum }
 
 unexpectedSimple :: Simple -> Mismatch
@@ -108,7 +98,7 @@ unexpectedDatum = unexpected . printDatum'
 list
   :: G (ListContext :- t) (ListContext :- t')
   -> G (Datum :- t) t'
-list = listWithIndentation Ordinary
+list = listWithStyle StyleData
 
 -- |
 -- >>> let grammar = with \g -> dottedList (el int) int >>> g
@@ -143,11 +133,11 @@ dottedList g final = begin >>> Dive (onTail (g >>> end) >>> final)
            [] -> Right t
            d:_ -> Left $ unexpectedDatum d)
 
-listWithIndentation
-  :: Indentation
+listWithStyle
+  :: Style
   -> G (ListContext :- t) (ListContext :- t')
   -> G (Datum :- t) t'
-listWithIndentation ind g = begin >>> Dive (g >>> end)
+listWithStyle ind g = begin >>> Dive (g >>> end)
   where
     begin = locate >>> partialOsi
       (\case
@@ -169,6 +159,33 @@ el
   -> G (ListContext :- t) (ListContext :- t')
 el g = coerced (Flip cons >>> onTail g >>> Step)
 
+reifyContext :: G (ListContext :- t) (List Datum :- t)
+reifyContext = iso coerce coerce
+
+decontextualise
+  :: G (List Datum :- t) (List Datum :- t')
+  -> G (ListContext :- t) t'
+decontextualise g = reifyContext >>> g >>> end
+  where
+    end = Flip $ PartialIso
+      (\t -> [] :- t)
+      (\(lst :- t) ->
+         case lst of
+           [] -> Right t
+           d:_ -> Left $ unexpectedDatum d)
+
+recontextualise
+  :: G (ListContext :- t) (ListContext :- t')
+  -> G (List Datum :- t) t'
+recontextualise g = flipped reifyContext >>> g >>> end
+  where
+    end = Flip $ PartialIso
+      (\t -> MkListContext [] :- t)
+      (\(MkListContext lst :- t) ->
+         case lst of
+           [] -> Right t
+           d:_ -> Left $ unexpectedDatum d)
+
 -- | matches the remainder of a list as repetition of a given
 -- grammar.
 --
@@ -235,8 +252,8 @@ rest g =
 -- >>> encodeTest dataRestGrammar $ MkExample [1,2,3] "end"
 -- (1 2 3 end)
 restData
-  :: G (List Datum :- t) (a :- t)
-  -> G (ListContext :- t) (ListContext :- a :- t)
+  :: G (List Datum :- t) t'
+  -> G (ListContext :- t) (ListContext :- t')
 restData g =
   iso coerce coerce
   >>> g
@@ -351,33 +368,36 @@ int = integer >>> iso fromIntegral fromIntegral
 
 -- high-level combinators
 
+redecorate :: Style -> G (Datum :- t) t' -> G (Datum :- t) t'
+redecorate sty g = iso (styleWith sty) (styleWith sty) >>> g
+
 headTagged0 :: Text -> G (Datum :- t) t
-headTagged0 s = list $ el (symProcedure s)
+headTagged0 s = listWithStyle StyleCode $ el (sym s)
 
 headTagged0' :: Text -> DatumGrammar a -> G (Datum :- t) (List a :- t)
-headTagged0' s gt = list $ el (symProcedure s) >>> rest gt
+headTagged0' s gt = listWithStyle StyleCode $ el (sym s) >>> rest gt
 
 headTagged1 :: Text -> DatumGrammar a -> G (Datum :- t) (a :- t)
-headTagged1 s g1 = list $ el (symProcedure s) >>> el g1
+headTagged1 s g1 = listWithStyle StyleCode $ el (sym s) >>> el g1
 
 headTagged1'
   :: Text
   -> DatumGrammar a -> DatumGrammar b
   -> G (Datum :- t) (List b :- a :- t)
-headTagged1' s g1 gt = list $ el (symProcedure s) >>> el g1 >>> rest gt
+headTagged1' s g1 gt = list $ el (sym s) >>> el g1 >>> rest gt
 
 headTagged2
   :: Text
   -> DatumGrammar a -> DatumGrammar b
   -> G (Datum :- t) (b :- a :- t)
-headTagged2 s g1 g2 = list $ el (symProcedure s) >>> el g1 >>> el g2
+headTagged2 s g1 g2 = listWithStyle StyleCode $ el (sym s) >>> el g1 >>> el g2
 
 headTagged2'
   :: Text
   -> DatumGrammar a -> DatumGrammar b -> DatumGrammar c
   -> G (Datum :- t) (List c :- b :- a :- t)
 headTagged2' s g1 g2 gt =
-  list $ el (symProcedure s) >>> el g1 >>> el g2 >>> rest gt
+  listWithStyle StyleCode $ el (sym s) >>> el g1 >>> el g2 >>> rest gt
 
 ifLike
   -- | keyword
@@ -390,21 +410,17 @@ ifLike
   -> DatumGrammar c
   -> G (Datum :- t) (c :- b :- a :- t)
 ifLike kw c t f =
-  listWithIndentation (NSpecial 1) $
-    el (symBuiltin kw) >>> el c >>> el t >>> el f
-
-symBuiltin, symProcedure :: Text -> G (Datum :- t) t
-symBuiltin s = decorate SynBuiltin >>> sym s
-symProcedure s = decorate SynProcedure >>> sym s
+  listWithStyle (StyleSyntax 1) $
+    el (sym kw) >>> el c >>> el t >>> el f
 
 letLike
   :: Text
   -> (forall t. G (Datum :- t) (a :- t))
   -> (forall t. G (Datum :- t) (b :- t))
-  -> G (Datum :- (List (a, b) :- t1)) t2
+  -> G (Datum :- List (a, b) :- t1) t2
   -> G (Datum :- t1) t2
-letLike kw name rhs e = listWithIndentation (NSpecial 1) $
-  el (symBuiltin kw) >>> el bindings >>> el e
+letLike kw name rhs e = listWithStyle (StyleSyntax 1) $
+  el (sym kw) >>> el bindings >>> el e
   where
     bindings = list $ rest binding
     binding :: G (Datum :- t) ((_, _) :- t)
@@ -415,8 +431,8 @@ lambdaLike
   -> G (Datum :- t1) (a :- t2)
   -> G (ListContext :- a :- t2) (ListContext :- t3)
   -> G (Datum :- t1) t3
-lambdaLike kw formals body = listWithIndentation (NSpecial 1) $
-  el (decorate SynBuiltin >>> kw)
+lambdaLike kw formals body = listWithStyle (StyleSyntax 1) $
+  el kw
   >>> el formals
   >>> body
 
@@ -431,8 +447,8 @@ beginLike
   -> G (ListContext :- t) (ListContext :- t')
   -> G (Datum :- t) t'
 beginLike kw g =
-  listWithIndentation (NSpecial 0) $
-    el (symBuiltin kw) >>> g
+  listWithStyle (StyleSyntax 0) $
+    el (sym kw) >>> g
 
 -- | define a printed syntax for an object which cannot be read.
 unreadable

src/Gyehoek/Sexp/Print.hs

@@ -1,3 +1,4 @@
+{-# OPTIONS_GHC -Wno-incomplete-patterns #-}
 module Gyehoek.Sexp.Print
   ( printDatum
   , printDatumW
@@ -6,26 +7,34 @@ module Gyehoek.Sexp.Print
   , printData'
   , htmlDatum
   , htmlData
+  , putDoc
   ) where
 
 import Gyehoek.Sexp.Syntax
 import Prettyprinter
-import Data.Functor.Foldable
-import qualified Control.Comonad.Trans.Cofree as F
-import Prettyprinter.Util
-import Gyehoek.Prelude hiding (Simple, (:<))
-import Data.Foldable (traverse_, toList)
+import Gyehoek.Prelude hiding (Simple)
 import qualified Prettyprinter.Render.Terminal as ANSI
 import System.IO (stdout)
 import Prettyprinter.Render.Terminal (Color(..), color, italicized, AnsiStyle, bold, colorDull)
 import Prettyprinter.Render.Text (renderStrict)
-import qualified Data.Scientific as Sci
 import Data.List (intersperse)
 import Lucid
 import Prettyprinter.Render.Util.SimpleDocTree (treeForm)
 import Prettyprinter.Lucid (renderHtml)
+import Data.Foldable (toList)
+import qualified Data.Scientific as Sci
 
 
+data Syn
+  = SynSyntax
+  | SynProcedure
+  | SynParen Int
+  | SynString
+  | SynConstant
+  | SynVariable
+  | SynNone
+  deriving (Show, Read, Data, Generic, Eq)
+
 printDatum' :: Datum -> Text
 printDatum' =
   prettyDatum 0
@@ -83,7 +92,7 @@ printDatumW w =
 
 prettyDatum :: Int -> Datum -> Doc Syn
 prettyDatum depth datum = case datum of
-  Simple simp -> annotate (datum ^. syntax) $ prettySimple depth simp
+  Simple simp -> prettySimple depth simp
   DotList xs x ->
     pparen depth . group . align $
       vsep [ vsep (prettyDatum (depth+1) <$> toList xs)
@@ -91,35 +100,33 @@ prettyDatum depth datum = case datum of
            , prettyDatum (depth+1) x
            ]
       
-  List' indent xs ->
-    case indent of
-      NSpecial n | keyword:args <- xs ->
-        let (specialArgs,body) = splitAt n args
-        in pparen depth . nest 2 . vsep $
-            [ group . nest 2 . hcat $
-              [ prettyDatum (depth+1) keyword
-              , if null specialArgs then mempty else softline
-              , hsep $ prettyDatum (depth+1) <$> specialArgs
-              ]
-            , vsep $ prettyDatum (depth+1) <$> body
+  List' sty xs -> case sty of
+    StyleSyntax n | keyword:args <- xs ->
+      let (specialArgs,body) = splitAt n args
+      in pparen depth . nest 2 . vsep $
+          [ group . nest 2 . hcat $
+            [ annotate SynSyntax $ prettyDatum (depth+1) keyword
+            , if null specialArgs then mempty else softline
+            , hsep $ prettyDatum (depth+1) <$> specialArgs
             ]
-      Ordinary; NSpecial _ -> pparen depth $
-        group . align . vsep $
-          prettyDatum (depth+1) <$> xs
+          , vsep $ prettyDatum (depth+1) <$> body
+          ]
+    StyleCode | f:args <- xs -> pparen depth $
+      group . align . vsep . (_head %~ annotate SynProcedure) $
+        prettyDatum (depth+1) <$> xs
+    StyleData; StyleSyntax _; StyleCode -> pparen depth $
+      group . align . vsep $
+        prettyDatum (depth+1) <$> xs
   _ -> error [i|unimplemented: #{datum}|]
 
 pparen depth = enclose (delim depth "(") (delim depth ")")
 delim depth = annotate (SynParen depth)
 
-delimited :: Int -> Doc Syn -> Doc Syn -> List (Doc Syn) -> Doc Syn
-delimited depth open close =
-  encloseSep (delim depth open) (delim depth close) softline
-
 prettySimple :: Int -> Simple -> Doc Syn
 prettySimple depth = \case
   SimpleBoolean b -> annotate SynConstant $ if b then "#t" else "#f"
-  SimpleNumber n ->
-    Sci.floatingOrInteger n
+  SimpleNumber n -> n
+    & Sci.floatingOrInteger @Double @Integer
     & either viaShow viaShow
     & annotate SynConstant
   SimpleString s -> annotate SynString $ viaShow s
@@ -132,7 +139,7 @@ putDoc = ANSI.renderIO stdout
 
 highlightAnsi :: Syn -> AnsiStyle
 highlightAnsi = \case
-  (SynBuiltin; SynMacro) -> color Magenta <> italicized <> bold
+  SynSyntax -> color Magenta <> italicized <> bold
   SynProcedure -> color Blue
   SynConstant -> color Yellow
   SynParen n -> colorDull $ rainbow ^?! ix n
@@ -144,8 +151,7 @@ highlightHtml :: Syn -> Html () -> Html ()
 highlightHtml syn = span_ [class_ synClass]
   where
     synClass = case syn of
-      SynBuiltin -> "syn-builtin"
-      SynMacro -> "syn-macro"
+      SynSyntax -> "syn-builtin"
       SynConstant -> "syn-constant"
       SynString -> "syn-string"
       SynProcedure -> "syn-procedure"

src/Gyehoek/Sexp/Read.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE ApplicativeDo #-}
 module Gyehoek.Sexp.Read
   ( readFile
   , readString
@@ -20,6 +21,7 @@ import qualified Data.Text as T
 import Data.Char (GeneralCategory(..), generalCategory)
 import Data.Scientific (Scientific)
 import Gyehoek.Jalmot
+import Data.Foldable
 
 
 readFile :: (Jalmot :> es, IOE :> es) => FilePath -> Eff es (List Datum)
@@ -104,18 +106,51 @@ verb = L.symbol sc
 
 identifier :: P Text
 identifier = label "identifier" . lexeme . choice $
-  [ typical-- , delimited, peculiar
+  [ typical
+  -- , delimited
+  , peculiar
   ]
   where
     typical = T.cons <$> initial <*> subsequent
-      where
-        subsequent = takeWhileP Nothing \c ->
-          isInitial c ||
-          c `hasCategory` [SpacingCombiningMark, EnclosingMark, DecimalNumber]
-          || c == '.' || c == '@' || c == '+' || c == '-'
-        initial = satisfy isInitial
+    subsequent = takeWhileP Nothing \c ->
+      isInitial c ||
+      c `hasCategory` [SpacingCombiningMark, EnclosingMark, DecimalNumber]
+      || c == '.' || c == '@' || c == '+' || c == '-'
+    initial = satisfy isInitial
     delimited = _
-    peculiar = _
+    peculiar = peculiarSign <|> peculiarDot
+
+    -- peculiarSign과 R⁷RS의 이 production 새 개들은 같음:
+    --   ⟨explicit sign⟩
+    --   ⟨explicit sign⟩ ⟨sign subsequent⟩ ⟨subsequent⟩*
+    --   ⟨explicit sign⟩ . ⟨dot subsequent⟩ ⟨subsequent⟩*
+    -- 같음:
+    --   ⟨explicit sign⟩
+    --     ((⟨sign subsequent⟩ | . ⟨dot subsequent⟩) ⟨subsequent⟩*)?
+    peculiarSign = do
+      sign <- explicitSign
+      r <- fold <$> optional do
+        neck <- choice
+          [ T.singleton <$> signSubsequent
+          , T.cons <$> single '.' <*> (T.singleton <$> dotSubsequent)
+          ]
+        subs <- subsequent
+        pure $ neck <> subs
+      pure $ T.cons sign r
+
+    -- . ⟨dot subsequent⟩ ⟨subsequent⟩*
+    peculiarDot = do
+      dot <- single '.'
+      dotSub <- dotSubsequent
+      subs <- subsequent
+      pure $ T.cons dot $ T.cons dotSub subs
+
+    dotSubsequent = single '.' <|> signSubsequent
+      <?> "dot subsequent"
+    explicitSign = (satisfy \c -> c == '+' || c == '-')
+      <?> "explicit sign"
+    signSubsequent = initial <|> explicitSign <|> satisfy (=='@')
+      <?> "sign subsequent"
 
     hasCategory c xs = generalCategory c `elem` xs
     isInitial c = (c `hasCategory`
@@ -207,7 +242,7 @@ simpleDatum = choice
   , SimpleNumber <$> try number
   -- , SimpleCharacter <$> character
   , SimpleString <$> string
-  , SimpleSymbol <$> symbol
+  , SimpleSymbol <$> try symbol
   -- , SimpleBytevector <$> bytevector
   ]
 
@@ -219,9 +254,9 @@ compoundDatum = choice
 list :: P Compound
 list = label "list" . between lparen rparen $ do
   optional datum >>= \case
-    Nothing -> pure $ ListF Ordinary []
+    Nothing -> pure $ ListF StyleData []
     Just x -> do
       xs <- many datum
       optional (dot *> datum) >>= \case
-        Nothing -> pure $ ListF Ordinary (x:xs)
+        Nothing -> pure $ ListF StyleData (x:xs)
         Just y -> pure $ DotListF (x:|xs) y

src/Gyehoek/Sexp/Syntax.hs

@@ -1,6 +1,7 @@
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE ApplicativeDo #-}
+{- HLINT ignore "Use newtype instead of data" -}
 module Gyehoek.Sexp.Syntax
   ( DatumF(..)
   , Simple(..)
@@ -13,8 +14,7 @@ module Gyehoek.Sexp.Syntax
   , Cofree((:<))
   , Fix(..)
   , Compound
-  , Indentation(..)
-  , Syn(..)
+  , Style(..)
   , pattern Simple
   , pattern Compound
   , pattern Labeled
@@ -25,10 +25,8 @@ module Gyehoek.Sexp.Syntax
   , pattern Vector
   , pattern DotList
   , pattern Gyehoek.Sexp.Syntax.List
-  , syntax
-  , indentation
-  , adorn
-  , indentWith
+  , style
+  , styleWith
   , pattern Unreadable
   , pattern Bytevector
   , pattern Symbol
@@ -39,15 +37,16 @@ module Gyehoek.Sexp.Syntax
   , Ann(..)
   , noAnn
   , ann
+  , dat
   , pattern List'
   , position
   , stripAnn
   ) where
 
-import Language.Haskell.TH.Syntax (Lift (lift), liftData)
+import Language.Haskell.TH.Syntax (Lift (lift))
 import Data.Scientific (Scientific)
 import Data.ByteString (ByteString)
-import Gyehoek.Prelude hiding ((:<), Simple)
+import Gyehoek.Prelude hiding (Simple)
 import Text.Megaparsec.Pos (SourcePos(..), sourcePosPretty)
 import Control.Comonad.Cofree (Cofree((:<)), _extract, _unwrap)
 import Data.Fix (Fix (..))
@@ -68,7 +67,9 @@ data DatumF a
   | CompoundF (CompoundF a)
   | LabeledF Label a
   | LabelRefF Label
+  -- | Should not be used outside of the "Gyehoek.Sexp.QQ" implementation.
   | MetaF Text
+  -- | Should not be used outside of the "Gyehoek.Sexp.QQ" implementation.
   | MetaSpliceF Text
   deriving stock (Show, Eq, Data, Generic, Lift, Functor, Foldable, Traversable)
   deriving anyclass (NFData)
@@ -85,7 +86,7 @@ data Simple
   deriving anyclass (NFData)
 
 data CompoundF a
-  = ListF Indentation (List a)
+  = ListF Style (List a)
   | DotListF (NonEmpty a) a
   | VectorF (List a)
   | AbbrevF Prefix a
@@ -93,7 +94,12 @@ data CompoundF a
   deriving anyclass (NFData)
 
 data Prefix
-  = Quote | Backtick | Comma | CommaAt
+  = Quote -- ^ @'@
+  | Backtick -- ^ @`@
+  | Comma -- ^ @,@
+  | CommaAt -- ^ @,\@@
+  | PoundQuote -- ^ @#'@
+  | PoundBacktick -- ^ @#`@
   deriving stock (Show, Eq, Data, Generic, Lift)
   deriving anyclass (NFData)
 
@@ -114,33 +120,21 @@ newtype Label = MkLabel Natural
 type Datum = Cofree DatumF Ann
 type Compound = CompoundF Datum
 
-data Indentation
-  = NSpecial Int
-  | Ordinary
+data Style
+  = StyleSyntax Int
+  | StyleCode
+  | StyleData
   deriving stock (Data, Eq, Generic, Show, Lift, Read)
   deriving anyclass (NFData)
 
-data Syn
-  = SynMacro
-  | SynBuiltin
-  | SynProcedure
-  | SynParen Int
-  | SynString
-  | SynConstant
-  | SynVariable
-  | SynNone
-  deriving (Show, Read, Data, Generic, Eq, Lift)
-
 data Ann = MkAnn
-  { syntax :: Syn
-  , position :: Maybe SourcePos
+  { position :: Maybe SourcePos
   }
   deriving (Show, Data, Eq, Generic)
 
 noAnn :: Ann
 noAnn = MkAnn
-  { syntax = SynNone
-  , position = Nothing
+  { position = Nothing
   }
 
 -- requisite of the Pretty instance for invertible-grammar's error type.
@@ -158,23 +152,21 @@ deriveEq1 ''DatumF
 ann :: Lens' Datum Ann
 ann = _extract
 
-syntax :: Lens' Datum Syn
-syntax = ann . #syntax
+dat :: Lens' Datum (DatumF Datum)
+dat = _unwrap
 
 position :: Lens' Datum (Maybe SourcePos)
 position = ann . #position
 
-indentation :: Traversal' Datum Indentation
-indentation k (syn :< CompoundF (ListF ind xs)) = do
+-- affine
+style :: Traversal' Datum Style
+style k (syn :< CompoundF (ListF ind xs)) = do
   ind' <- k ind
   pure $ syn :< CompoundF (ListF ind' xs)
-indentation k a = pure a
+style k a = pure a
 
-adorn :: Syn -> Datum -> Datum
-adorn = set syntax
-
-indentWith :: Indentation -> Datum -> Datum
-indentWith = set indentation
+styleWith :: Style -> Datum -> Datum
+styleWith = set style
 
 stripAnn :: Datum -> Fix DatumF
 stripAnn = hoist tailF
@@ -208,9 +200,9 @@ pattern Meta x <- _ :< MetaF x
 
 pattern List :: List Datum -> Datum
 pattern List a <- _ :< CompoundF (ListF _ a)
-  where List a = noAnn :< CompoundF (ListF Ordinary a)
+  where List a = noAnn :< CompoundF (ListF StyleData a)
 
-pattern List' :: Indentation -> List Datum -> Datum
+pattern List' :: Style -> List Datum -> Datum
 pattern List' ind a <- _ :< CompoundF (ListF ind a)
   where List' ind a = noAnn :< CompoundF (ListF ind a)
 
@@ -226,12 +218,25 @@ pattern Abbrev :: Prefix -> Datum -> Datum
 pattern Abbrev p a <- _ :< CompoundF (AbbrevF p a)
   where Abbrev p a = noAnn :< CompoundF (AbbrevF p a)
 
+pattern Boolean :: Bool -> Datum
 pattern Boolean a = Simple (SimpleBoolean a)
+
+pattern Number :: Scientific -> Datum
 pattern Number a = Simple (SimpleNumber a)
+
+pattern Character :: Char -> Datum
 pattern Character a = Simple (SimpleCharacter a)
+
+pattern String :: Text -> Datum
 pattern String a = Simple (SimpleString a)
+
+pattern Symbol :: Text -> Datum
 pattern Symbol a = Simple (SimpleSymbol a)
+
+pattern Bytevector :: ByteString -> Datum
 pattern Bytevector a = Simple (SimpleBytevector a)
+
+pattern Unreadable :: Text -> Datum
 pattern Unreadable a = Simple (SimpleUnreadable a)
 
 

t.scm

@@ -1,5 +1,4 @@
-((λ ()
-   (* 2 (call/cc
-         (λ (k)
-           (begin (k 6)
-                  3))))))
+(import (scheme eval))
+
+(eval '(λ (x) x)
+      (environment))

test/Gyehoek/Test/Sexp/Print.hs

@@ -24,19 +24,19 @@ thinWide name x = testGroup name
   , tcaseW 4 (name <> "-thin") x
   ]
 
-datumBegin xs = S.indentWith (S.NSpecial 0) . S.List $
-  (S.adorn S.SynBuiltin . S.Symbol $ "begin") : xs
+datumBegin xs = S.styleWith (S.StyleSyntax 0) . S.List $
+  S.Symbol "begin" : xs
 
 datumLambda formals body =
-  S.indentWith (S.NSpecial 1) . S.List $
-  (S.adorn S.SynBuiltin . S.Symbol $ "lambda") : formals : body
+  S.styleWith (S.StyleSyntax 1) . S.List $
+  S.Symbol "lambda" : formals : body
 
-test_print = testGroup "sexp pretty printer" $
+test_print = testGroup "sexp pretty printer"
   [ tcase "null" $ S.List []
   , thinWide "simple-list" $
     S.List [ S.Symbol s | s <- ["가","나","다","라"] ]
   , thinWide "begin-nonempty" $
-    S.indentWith (S.NSpecial 0) $
+    S.styleWith (S.StyleSyntax 0) $
     datumBegin [ S.Symbol "책을"
            , S.Symbol "더"
            , S.Symbol "먹으세요~!"

test/Gyehoek/Test/Sexp/Read.hs

@@ -20,7 +20,6 @@ brokenReaderTests :: List String
 brokenReaderTests =
   [ "delimited-identifier"
   , "string-line-continuation"
-  , "peculiar-identifier-dot"
   , "meta-splice-expression-interior-brace"
   , "datum-comment"
   ]