src/Tools/code/code_haskell.ML
author haftmann
Fri Oct 24 17:48:40 2008 +0200 (2008-10-24)
changeset 28687 150a8a1eae1a
parent 28663 bd8438543bf2
child 28708 a1a436f09ec6
permissions -rw-r--r--
simplified syntax for class parameters
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(*  Title:      Tools/code/code_haskell.ML
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    ID:         $Id$
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    Author:     Florian Haftmann, TU Muenchen
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Serializer for Haskell.
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*)
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signature CODE_HASKELL =
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sig
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  val setup: theory -> theory
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end;
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structure Code_Haskell : CODE_HASKELL =
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struct
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val target = "Haskell";
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open Basic_Code_Thingol;
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open Code_Printer;
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infixr 5 @@;
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infixr 5 @|;
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(** Haskell serializer **)
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fun pr_haskell_bind pr_term =
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  let
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    fun pr_bind ((NONE, NONE), _) = str "_"
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      | pr_bind ((SOME v, NONE), _) = str v
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      | pr_bind ((NONE, SOME p), _) = p
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      | pr_bind ((SOME v, SOME p), _) = brackets [str v, str "@", p];
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  in gen_pr_bind pr_bind pr_term end;
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fun pr_haskell_stmt naming labelled_name syntax_class syntax_tyco syntax_const
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    init_syms deresolve is_cons contr_classparam_typs deriving_show =
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  let
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    val deresolve_base = NameSpace.base o deresolve;
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    fun class_name class = case syntax_class class
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     of NONE => deresolve class
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      | SOME class => class;
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    fun pr_typcontext tyvars vs = case maps (fn (v, sort) => map (pair v) sort) vs
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     of [] => []
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      | classbinds => Pretty.enum "," "(" ")" (
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          map (fn (v, class) =>
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            str (class_name class ^ " " ^ Code_Name.lookup_var tyvars v)) classbinds)
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          @@ str " => ";
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    fun pr_typforall tyvars vs = case map fst vs
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     of [] => []
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      | vnames => str "forall " :: Pretty.breaks
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          (map (str o Code_Name.lookup_var tyvars) vnames) @ str "." @@ Pretty.brk 1;
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    fun pr_tycoexpr tyvars fxy (tyco, tys) =
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      brackify fxy (str tyco :: map (pr_typ tyvars BR) tys)
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    and pr_typ tyvars fxy (tycoexpr as tyco `%% tys) = (case syntax_tyco tyco
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         of NONE => pr_tycoexpr tyvars fxy (deresolve tyco, tys)
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          | SOME (i, pr) => pr (pr_typ tyvars) fxy tys)
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      | pr_typ tyvars fxy (ITyVar v) = (str o Code_Name.lookup_var tyvars) v;
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    fun pr_typdecl tyvars (vs, tycoexpr) =
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      Pretty.block (pr_typcontext tyvars vs @| pr_tycoexpr tyvars NOBR tycoexpr);
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    fun pr_typscheme tyvars (vs, ty) =
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      Pretty.block (pr_typforall tyvars vs @ pr_typcontext tyvars vs @| pr_typ tyvars NOBR ty);
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    fun pr_term tyvars thm pat vars fxy (IConst c) =
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          pr_app tyvars thm pat vars fxy (c, [])
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      | pr_term tyvars thm pat vars fxy (t as (t1 `$ t2)) =
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          (case Code_Thingol.unfold_const_app t
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           of SOME app => pr_app tyvars thm pat vars fxy app
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            | _ =>
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                brackify fxy [
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                  pr_term tyvars thm pat vars NOBR t1,
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                  pr_term tyvars thm pat vars BR t2
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                ])
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      | pr_term tyvars thm pat vars fxy (IVar v) =
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          (str o Code_Name.lookup_var vars) v
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      | pr_term tyvars thm pat vars fxy (t as _ `|-> _) =
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          let
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            val (binds, t') = Code_Thingol.unfold_abs t;
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            fun pr ((v, pat), ty) = pr_bind tyvars thm BR ((SOME v, pat), ty);
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            val (ps, vars') = fold_map pr binds vars;
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          in brackets (str "\\" :: ps @ str "->" @@ pr_term tyvars thm pat vars' NOBR t') end
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      | pr_term tyvars thm pat vars fxy (ICase (cases as (_, t0))) =
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          (case Code_Thingol.unfold_const_app t0
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           of SOME (c_ts as ((c, _), _)) => if is_none (syntax_const c)
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                then pr_case tyvars thm vars fxy cases
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                else pr_app tyvars thm pat vars fxy c_ts
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            | NONE => pr_case tyvars thm vars fxy cases)
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    and pr_app' tyvars thm pat vars ((c, (_, tys)), ts) = case contr_classparam_typs c
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     of [] => (str o deresolve) c :: map (pr_term tyvars thm pat vars BR) ts
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      | fingerprint => let
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          val ts_fingerprint = ts ~~ curry Library.take (length ts) fingerprint;
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          val needs_annotation = forall (fn (_, NONE) => true | (t, SOME _) =>
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            (not o Code_Thingol.locally_monomorphic) t) ts_fingerprint;
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          fun pr_term_anno (t, NONE) _ = pr_term tyvars thm pat vars BR t
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            | pr_term_anno (t, SOME _) ty =
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                brackets [pr_term tyvars thm pat vars NOBR t, str "::", pr_typ tyvars NOBR ty];
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        in
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          if needs_annotation then
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            (str o deresolve) c :: map2 pr_term_anno ts_fingerprint (curry Library.take (length ts) tys)
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          else (str o deresolve) c :: map (pr_term tyvars thm pat vars BR) ts
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        end
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    and pr_app tyvars = gen_pr_app (pr_app' tyvars) (pr_term tyvars) syntax_const is_cons naming
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    and pr_bind tyvars = pr_haskell_bind (pr_term tyvars)
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    and pr_case tyvars thm vars fxy (cases as ((_, [_]), _)) =
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          let
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            val (binds, t) = Code_Thingol.unfold_let (ICase cases);
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            fun pr ((pat, ty), t) vars =
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              vars
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              |> pr_bind tyvars thm BR ((NONE, SOME pat), ty)
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              |>> (fn p => semicolon [p, str "=", pr_term tyvars thm false vars NOBR t])
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            val (ps, vars') = fold_map pr binds vars;
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          in
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            Pretty.block_enclose (
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              str "let {",
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              concat [str "}", str "in", pr_term tyvars thm false vars' NOBR t]
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            ) ps
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          end
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      | pr_case tyvars thm vars fxy (((td, ty), bs as _ :: _), _) =
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          let
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            fun pr (pat, t) =
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              let
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                val (p, vars') = pr_bind tyvars thm NOBR ((NONE, SOME pat), ty) vars;
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              in semicolon [p, str "->", pr_term tyvars thm false vars' NOBR t] end;
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          in
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            Pretty.block_enclose (
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              concat [str "(case", pr_term tyvars thm false vars NOBR td, str "of", str "{"],
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              str "})"
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            ) (map pr bs)
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          end
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      | pr_case tyvars thm vars fxy ((_, []), _) = str "error \"empty case\"";
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    fun pr_stmt (name, Code_Thingol.Fun (_, ((vs, ty), []))) =
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          let
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            val tyvars = Code_Name.intro_vars (map fst vs) init_syms;
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            val n = (length o fst o Code_Thingol.unfold_fun) ty;
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          in
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            Pretty.chunks [
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              Pretty.block [
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                (str o suffix " ::" o deresolve_base) name,
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                Pretty.brk 1,
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                pr_typscheme tyvars (vs, ty),
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                str ";"
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              ],
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              concat (
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                (str o deresolve_base) name
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                :: map str (replicate n "_")
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                @ str "="
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                :: str "error"
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                @@ (str o (fn s => s ^ ";") o ML_Syntax.print_string
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                    o NameSpace.base o NameSpace.qualifier) name
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              )
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            ]
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          end
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      | pr_stmt (name, Code_Thingol.Fun (_, ((vs, ty), raw_eqs))) =
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          let
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            val eqs = filter (snd o snd) raw_eqs;
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            val tyvars = Code_Name.intro_vars (map fst vs) init_syms;
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            fun pr_eq ((ts, t), (thm, _)) =
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              let
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                val consts = map_filter
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                  (fn c => if (is_some o syntax_const) c
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                    then NONE else (SOME o NameSpace.base o deresolve) c)
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                    ((fold o Code_Thingol.fold_constnames) (insert (op =)) (t :: ts) []);
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                val vars = init_syms
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                  |> Code_Name.intro_vars consts
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                  |> Code_Name.intro_vars ((fold o Code_Thingol.fold_unbound_varnames)
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                       (insert (op =)) ts []);
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              in
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                semicolon (
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                  (str o deresolve_base) name
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                  :: map (pr_term tyvars thm true vars BR) ts
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                  @ str "="
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                  @@ pr_term tyvars thm false vars NOBR t
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                )
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              end;
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          in
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            Pretty.chunks (
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              Pretty.block [
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                (str o suffix " ::" o deresolve_base) name,
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                Pretty.brk 1,
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                pr_typscheme tyvars (vs, ty),
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                str ";"
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              ]
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              :: map pr_eq eqs
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            )
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          end
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      | pr_stmt (name, Code_Thingol.Datatype (_, (vs, []))) =
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          let
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            val tyvars = Code_Name.intro_vars (map fst vs) init_syms;
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          in
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            semicolon [
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              str "data",
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              pr_typdecl tyvars (vs, (deresolve_base name, map (ITyVar o fst) vs))
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            ]
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          end
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      | pr_stmt (name, Code_Thingol.Datatype (_, (vs, [(co, [ty])]))) =
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          let
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            val tyvars = Code_Name.intro_vars (map fst vs) init_syms;
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          in
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            semicolon (
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              str "newtype"
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              :: pr_typdecl tyvars (vs, (deresolve_base name, map (ITyVar o fst) vs))
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              :: str "="
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              :: (str o deresolve_base) co
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              :: pr_typ tyvars BR ty
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              :: (if deriving_show name then [str "deriving (Read, Show)"] else [])
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            )
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          end
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      | pr_stmt (name, Code_Thingol.Datatype (_, (vs, co :: cos))) =
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          let
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            val tyvars = Code_Name.intro_vars (map fst vs) init_syms;
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            fun pr_co (co, tys) =
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              concat (
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                (str o deresolve_base) co
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                :: map (pr_typ tyvars BR) tys
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              )
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          in
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            semicolon (
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              str "data"
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              :: pr_typdecl tyvars (vs, (deresolve_base name, map (ITyVar o fst) vs))
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              :: str "="
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              :: pr_co co
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              :: map ((fn p => Pretty.block [str "| ", p]) o pr_co) cos
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              @ (if deriving_show name then [str "deriving (Read, Show)"] else [])
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            )
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          end
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      | pr_stmt (name, Code_Thingol.Class (_, (v, (superclasses, classparams)))) =
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          let
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            val tyvars = Code_Name.intro_vars [v] init_syms;
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            fun pr_classparam (classparam, ty) =
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              semicolon [
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                (str o deresolve_base) classparam,
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                str "::",
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                pr_typ tyvars NOBR ty
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              ]
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          in
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            Pretty.block_enclose (
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              Pretty.block [
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                str "class ",
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                Pretty.block (pr_typcontext tyvars [(v, map fst superclasses)]),
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                str (deresolve_base name ^ " " ^ Code_Name.lookup_var tyvars v),
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                str " where {"
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              ],
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              str "};"
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            ) (map pr_classparam classparams)
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          end
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      | pr_stmt (_, Code_Thingol.Classinst ((class, (tyco, vs)), (_, classparam_insts))) =
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          let
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            val split_abs_pure = (fn (v, _) `|-> t => SOME (v, t) | _ => NONE);
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            val unfold_abs_pure = Code_Thingol.unfoldr split_abs_pure;
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            val tyvars = Code_Name.intro_vars (map fst vs) init_syms;
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            fun pr_instdef ((classparam, c_inst), (thm, _)) = case syntax_const classparam
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             of NONE => semicolon [
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                    (str o deresolve_base) classparam,
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                    str "=",
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                    pr_app tyvars thm false init_syms NOBR (c_inst, [])
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                  ]
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              | SOME (k, pr) =>
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                  let
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                    val (c_inst_name, (_, tys)) = c_inst;
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                    val const = if (is_some o syntax_const) c_inst_name
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                      then NONE else (SOME o NameSpace.base o deresolve) c_inst_name;
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                    val proto_rhs = Code_Thingol.eta_expand k (c_inst, []);
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                    val (vs, rhs) = unfold_abs_pure proto_rhs;
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                    val vars = init_syms
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                      |> Code_Name.intro_vars (the_list const)
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                      |> Code_Name.intro_vars vs;
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                    val lhs = IConst (classparam, ([], tys)) `$$ map IVar vs;
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                      (*dictionaries are not relevant at this late stage*)
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                  in
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                    semicolon [
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                      pr_term tyvars thm false vars NOBR lhs,
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                      str "=",
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                      pr_term tyvars thm false vars NOBR rhs
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                    ]
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                  end;
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          in
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            Pretty.block_enclose (
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              Pretty.block [
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                str "instance ",
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                Pretty.block (pr_typcontext tyvars vs),
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                str (class_name class ^ " "),
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                pr_typ tyvars BR (tyco `%% map (ITyVar o fst) vs),
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                str " where {"
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              ],
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              str "};"
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            ) (map pr_instdef classparam_insts)
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          end;
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  in pr_stmt end;
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fun haskell_program_of_program labelled_name module_name module_prefix reserved_names raw_module_alias program =
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  let
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    val module_alias = if is_some module_name then K module_name else raw_module_alias;
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    val reserved_names = Name.make_context reserved_names;
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    val mk_name_module = Code_Name.mk_name_module reserved_names module_prefix module_alias program;
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    fun add_stmt (name, (stmt, deps)) =
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      let
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        val (module_name, base) = Code_Name.dest_name name;
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        val module_name' = mk_name_module module_name;
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        val mk_name_stmt = yield_singleton Name.variants;
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        fun add_fun upper (nsp_fun, nsp_typ) =
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          let
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            val (base', nsp_fun') =
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              mk_name_stmt (if upper then Code_Name.first_upper base else base) nsp_fun
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          in (base', (nsp_fun', nsp_typ)) end;
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        fun add_typ (nsp_fun, nsp_typ) =
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          let
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            val (base', nsp_typ') = mk_name_stmt (Code_Name.first_upper base) nsp_typ
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          in (base', (nsp_fun, nsp_typ')) end;
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        val add_name = case stmt
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         of Code_Thingol.Fun _ => add_fun false
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          | Code_Thingol.Datatype _ => add_typ
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   310
          | Code_Thingol.Datatypecons _ => add_fun true
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   311
          | Code_Thingol.Class _ => add_typ
haftmann@28054
   312
          | Code_Thingol.Classrel _ => pair base
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   313
          | Code_Thingol.Classparam _ => add_fun false
haftmann@28054
   314
          | Code_Thingol.Classinst _ => pair base;
haftmann@28054
   315
        fun add_stmt' base' = case stmt
haftmann@28054
   316
         of Code_Thingol.Datatypecons _ =>
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   317
              cons (name, (NameSpace.append module_name' base', NONE))
haftmann@28054
   318
          | Code_Thingol.Classrel _ => I
haftmann@28054
   319
          | Code_Thingol.Classparam _ =>
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   320
              cons (name, (NameSpace.append module_name' base', NONE))
haftmann@28054
   321
          | _ => cons (name, (NameSpace.append module_name' base', SOME stmt));
haftmann@28054
   322
      in
haftmann@28054
   323
        Symtab.map_default (module_name', ([], ([], (reserved_names, reserved_names))))
haftmann@28054
   324
              (apfst (fold (insert (op = : string * string -> bool)) deps))
haftmann@28054
   325
        #> `(fn program => add_name ((snd o snd o the o Symtab.lookup program) module_name'))
haftmann@28054
   326
        #-> (fn (base', names) =>
haftmann@28054
   327
              (Symtab.map_entry module_name' o apsnd) (fn (stmts, _) =>
haftmann@28054
   328
              (add_stmt' base' stmts, names)))
haftmann@28054
   329
      end;
haftmann@28054
   330
    val hs_program = fold add_stmt (AList.make (fn name =>
haftmann@28054
   331
      (Graph.get_node program name, Graph.imm_succs program name))
haftmann@28054
   332
      (Graph.strong_conn program |> flat)) Symtab.empty;
haftmann@28663
   333
    fun deresolver name = (fst o the o AList.lookup (op =) ((fst o snd o the
haftmann@28663
   334
      o Symtab.lookup hs_program) ((mk_name_module o fst o Code_Name.dest_name) name))) name
haftmann@28663
   335
      handle Option => error ("Unknown statement name: " ^ labelled_name name);
haftmann@28054
   336
  in (deresolver, hs_program) end;
haftmann@28054
   337
haftmann@28054
   338
fun serialize_haskell module_prefix raw_module_name string_classes labelled_name
haftmann@28054
   339
    reserved_names includes raw_module_alias
haftmann@28663
   340
    syntax_class syntax_tyco syntax_const naming program cs destination =
haftmann@28054
   341
  let
haftmann@28054
   342
    val stmt_names = Code_Target.stmt_names_of_destination destination;
haftmann@28054
   343
    val module_name = if null stmt_names then raw_module_name else SOME "Code";
haftmann@28054
   344
    val (deresolver, hs_program) = haskell_program_of_program labelled_name
haftmann@28054
   345
      module_name module_prefix reserved_names raw_module_alias program;
haftmann@28054
   346
    val is_cons = Code_Thingol.is_cons program;
haftmann@28054
   347
    val contr_classparam_typs = Code_Thingol.contr_classparam_typs program;
haftmann@28054
   348
    fun deriving_show tyco =
haftmann@28054
   349
      let
haftmann@28054
   350
        fun deriv _ "fun" = false
haftmann@28054
   351
          | deriv tycos tyco = member (op =) tycos tyco orelse
haftmann@28054
   352
              case try (Graph.get_node program) tyco
haftmann@28663
   353
                of SOME (Code_Thingol.Datatype (_, (_, cs))) => forall (deriv' (tyco :: tycos))
haftmann@28054
   354
                    (maps snd cs)
haftmann@28054
   355
                 | NONE => true
haftmann@28054
   356
        and deriv' tycos (tyco `%% tys) = deriv tycos tyco
haftmann@28054
   357
              andalso forall (deriv' tycos) tys
haftmann@28054
   358
          | deriv' _ (ITyVar _) = true
haftmann@28054
   359
      in deriv [] tyco end;
haftmann@28663
   360
    val reserved_names = Code_Name.make_vars reserved_names;
haftmann@28663
   361
    fun pr_stmt qualified = pr_haskell_stmt naming labelled_name
haftmann@28663
   362
      syntax_class syntax_tyco syntax_const reserved_names
haftmann@28054
   363
      (if qualified then deresolver else NameSpace.base o deresolver)
haftmann@28054
   364
      is_cons contr_classparam_typs
haftmann@28054
   365
      (if string_classes then deriving_show else K false);
haftmann@28054
   366
    fun pr_module name content =
haftmann@28054
   367
      (name, Pretty.chunks [
haftmann@28054
   368
        str ("module " ^ name ^ " where {"),
haftmann@28054
   369
        str "",
haftmann@28054
   370
        content,
haftmann@28054
   371
        str "",
haftmann@28054
   372
        str "}"
haftmann@28054
   373
      ]);
haftmann@28054
   374
    fun serialize_module1 (module_name', (deps, (stmts, _))) =
haftmann@28054
   375
      let
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   376
        val stmt_names = map fst stmts;
haftmann@28054
   377
        val deps' = subtract (op =) stmt_names deps
haftmann@28054
   378
          |> distinct (op =)
haftmann@28054
   379
          |> map_filter (try deresolver);
haftmann@28054
   380
        val qualified = is_none module_name andalso
haftmann@28054
   381
          map deresolver stmt_names @ deps'
haftmann@28054
   382
          |> map NameSpace.base
haftmann@28054
   383
          |> has_duplicates (op =);
haftmann@28054
   384
        val imports = deps'
haftmann@28054
   385
          |> map NameSpace.qualifier
haftmann@28054
   386
          |> distinct (op =);
haftmann@28054
   387
        fun pr_import_include (name, _) = str ("import " ^ name ^ ";");
haftmann@28054
   388
        val pr_import_module = str o (if qualified
haftmann@28054
   389
          then prefix "import qualified "
haftmann@28054
   390
          else prefix "import ") o suffix ";";
haftmann@28054
   391
        val content = Pretty.chunks (
haftmann@28054
   392
            map pr_import_include includes
haftmann@28054
   393
            @ map pr_import_module imports
haftmann@28054
   394
            @ str ""
haftmann@28054
   395
            :: separate (str "") (map_filter
haftmann@28054
   396
              (fn (name, (_, SOME stmt)) => SOME (pr_stmt qualified (name, stmt))
haftmann@28054
   397
                | (_, (_, NONE)) => NONE) stmts)
haftmann@28054
   398
          )
haftmann@28054
   399
      in pr_module module_name' content end;
haftmann@28054
   400
    fun serialize_module2 (_, (_, (stmts, _))) = Pretty.chunks (
haftmann@28054
   401
      separate (str "") (map_filter
haftmann@28054
   402
        (fn (name, (_, SOME stmt)) => if null stmt_names
haftmann@28054
   403
              orelse member (op =) stmt_names name
haftmann@28054
   404
              then SOME (pr_stmt false (name, stmt))
haftmann@28054
   405
              else NONE
haftmann@28054
   406
          | (_, (_, NONE)) => NONE) stmts));
haftmann@28054
   407
    val serialize_module =
haftmann@28054
   408
      if null stmt_names then serialize_module1 else pair "" o serialize_module2;
haftmann@28054
   409
    fun write_module destination (modlname, content) =
haftmann@28054
   410
      let
haftmann@28054
   411
        val filename = case modlname
haftmann@28054
   412
         of "" => Path.explode "Main.hs"
haftmann@28054
   413
          | _ => (Path.ext "hs" o Path.explode o implode o separate "/"
haftmann@28054
   414
                o NameSpace.explode) modlname;
haftmann@28054
   415
        val pathname = Path.append destination filename;
haftmann@28054
   416
        val _ = File.mkdir (Path.dir pathname);
haftmann@28054
   417
      in File.write pathname (Code_Target.code_of_pretty content) end
haftmann@28054
   418
  in
haftmann@28054
   419
    Code_Target.mk_serialization target NONE
haftmann@28054
   420
      (fn NONE => K () o map (Code_Target.code_writeln o snd) | SOME file => K () o map (write_module file))
haftmann@28054
   421
      (rpair [] o cat_lines o map (Code_Target.code_of_pretty o snd))
haftmann@28054
   422
      (map (uncurry pr_module) includes
haftmann@28054
   423
        @ map serialize_module (Symtab.dest hs_program))
haftmann@28054
   424
      destination
haftmann@28054
   425
  end;
haftmann@28054
   426
haftmann@28064
   427
val literals = let
haftmann@28064
   428
  fun char_haskell c =
haftmann@28064
   429
    let
haftmann@28064
   430
      val s = ML_Syntax.print_char c;
haftmann@28064
   431
    in if s = "'" then "\\'" else s end;
haftmann@28064
   432
in Literals {
haftmann@28064
   433
  literal_char = enclose "'" "'" o char_haskell,
haftmann@28064
   434
  literal_string = quote o translate_string char_haskell,
haftmann@28064
   435
  literal_numeral = fn unbounded => fn k => if k >= 0 then string_of_int k
haftmann@28064
   436
    else enclose "(" ")" (signed_string_of_int k),
haftmann@28064
   437
  literal_list = Pretty.enum "," "[" "]",
haftmann@28064
   438
  infix_cons = (5, ":")
haftmann@28064
   439
} end;
haftmann@28064
   440
haftmann@28054
   441
haftmann@28054
   442
(** optional monad syntax **)
haftmann@28054
   443
haftmann@28054
   444
fun pretty_haskell_monad c_bind =
haftmann@28054
   445
  let
haftmann@28145
   446
    fun dest_bind t1 t2 = case Code_Thingol.split_abs t2
haftmann@28145
   447
     of SOME (((v, pat), ty), t') =>
haftmann@28145
   448
          SOME ((SOME (((SOME v, pat), ty), true), t1), t')
haftmann@28145
   449
      | NONE => NONE;
haftmann@28663
   450
    fun dest_monad c_bind_name (IConst (c, _) `$ t1 `$ t2) =
haftmann@28663
   451
          if c = c_bind_name then dest_bind t1 t2
haftmann@28145
   452
          else NONE
haftmann@28663
   453
      | dest_monad _ t = case Code_Thingol.split_let t
haftmann@28145
   454
         of SOME (((pat, ty), tbind), t') =>
haftmann@28145
   455
              SOME ((SOME (((NONE, SOME pat), ty), false), tbind), t')
haftmann@28145
   456
          | NONE => NONE;
haftmann@28663
   457
    fun implode_monad c_bind_name = Code_Thingol.unfoldr (dest_monad c_bind_name);
haftmann@28145
   458
    fun pr_monad pr_bind pr (NONE, t) vars =
haftmann@28145
   459
          (semicolon [pr vars NOBR t], vars)
haftmann@28145
   460
      | pr_monad pr_bind pr (SOME (bind, true), t) vars = vars
haftmann@28145
   461
          |> pr_bind NOBR bind
haftmann@28145
   462
          |>> (fn p => semicolon [p, str "<-", pr vars NOBR t])
haftmann@28145
   463
      | pr_monad pr_bind pr (SOME (bind, false), t) vars = vars
haftmann@28145
   464
          |> pr_bind NOBR bind
haftmann@28145
   465
          |>> (fn p => semicolon [str "let", p, str "=", pr vars NOBR t]);
haftmann@28663
   466
    fun pretty pr naming thm pat vars fxy [(t1, _), (t2, _)] = case dest_bind t1 t2
haftmann@28145
   467
     of SOME (bind, t') => let
haftmann@28663
   468
          val (binds, t'') = implode_monad ((the o Code_Thingol.lookup_const naming) c_bind) t'
haftmann@28145
   469
          val (ps, vars') = fold_map (pr_monad (pr_haskell_bind (K (K pr)) thm) pr) (bind :: binds) vars;
haftmann@28145
   470
        in (brackify fxy o single o Pretty.enclose "do {" "}" o Pretty.breaks) (ps @| pr vars' NOBR t'') end
haftmann@28145
   471
      | NONE => brackify_infix (1, L) fxy
haftmann@28145
   472
          [pr vars (INFX (1, L)) t1, str ">>=", pr vars (INFX (1, X)) t2]
haftmann@28145
   473
  in (2, pretty) end;
haftmann@28054
   474
haftmann@28145
   475
fun add_monad target' raw_c_bind thy =
haftmann@28054
   476
  let
haftmann@28054
   477
    val c_bind = Code_Unit.read_const thy raw_c_bind;
haftmann@28054
   478
  in if target = target' then
haftmann@28054
   479
    thy
haftmann@28145
   480
    |> Code_Target.add_syntax_const target c_bind
haftmann@28663
   481
        (SOME (pretty_haskell_monad c_bind))
haftmann@28054
   482
  else error "Only Haskell target allows for monad syntax" end;
haftmann@28054
   483
haftmann@28054
   484
haftmann@28054
   485
(** Isar setup **)
haftmann@28054
   486
haftmann@28054
   487
fun isar_seri_haskell module =
haftmann@28054
   488
  Code_Target.parse_args (Scan.option (Args.$$$ "root" -- Args.colon |-- Args.name)
haftmann@28054
   489
    -- Scan.optional (Args.$$$ "string_classes" >> K true) false
haftmann@28054
   490
    >> (fn (module_prefix, string_classes) =>
haftmann@28054
   491
      serialize_haskell module_prefix module string_classes));
haftmann@28054
   492
haftmann@28054
   493
val _ =
haftmann@28054
   494
  OuterSyntax.command "code_monad" "define code syntax for monads" OuterKeyword.thy_decl (
haftmann@28145
   495
    OuterParse.term_group -- OuterParse.name >> (fn (raw_bind, target) =>
haftmann@28145
   496
      Toplevel.theory  (add_monad target raw_bind))
haftmann@28054
   497
  );
haftmann@28054
   498
haftmann@28054
   499
val setup =
haftmann@28064
   500
  Code_Target.add_target (target, (isar_seri_haskell, literals))
haftmann@28054
   501
  #> Code_Target.add_syntax_tyco target "fun" (SOME (2, fn pr_typ => fn fxy => fn [ty1, ty2] =>
haftmann@28054
   502
      brackify_infix (1, R) fxy [
haftmann@28054
   503
        pr_typ (INFX (1, X)) ty1,
haftmann@28054
   504
        str "->",
haftmann@28054
   505
        pr_typ (INFX (1, R)) ty2
haftmann@28054
   506
      ]))
haftmann@28054
   507
  #> fold (Code_Target.add_reserved target) [
haftmann@28054
   508
      "hiding", "deriving", "where", "case", "of", "infix", "infixl", "infixr",
haftmann@28054
   509
      "import", "default", "forall", "let", "in", "class", "qualified", "data",
haftmann@28054
   510
      "newtype", "instance", "if", "then", "else", "type", "as", "do", "module"
haftmann@28054
   511
    ]
haftmann@28054
   512
  #> fold (Code_Target.add_reserved target) [
haftmann@28054
   513
      "Prelude", "Main", "Bool", "Maybe", "Either", "Ordering", "Char", "String", "Int",
haftmann@28054
   514
      "Integer", "Float", "Double", "Rational", "IO", "Eq", "Ord", "Enum", "Bounded",
haftmann@28054
   515
      "Num", "Real", "Integral", "Fractional", "Floating", "RealFloat", "Monad", "Functor",
haftmann@28054
   516
      "AlreadyExists", "ArithException", "ArrayException", "AssertionFailed", "AsyncException",
haftmann@28054
   517
      "BlockedOnDeadMVar", "Deadlock", "Denormal", "DivideByZero", "DotNetException", "DynException",
haftmann@28054
   518
      "Dynamic", "EOF", "EQ", "EmptyRec", "ErrorCall", "ExitException", "ExitFailure",
haftmann@28054
   519
      "ExitSuccess", "False", "GT", "HeapOverflow",
haftmann@28054
   520
      "IOError", "IOException", "IllegalOperation",
haftmann@28054
   521
      "IndexOutOfBounds", "Just", "Key", "LT", "Left", "LossOfPrecision", "NoMethodError",
haftmann@28054
   522
      "NoSuchThing", "NonTermination", "Nothing", "Obj", "OtherError", "Overflow",
haftmann@28054
   523
      "PatternMatchFail", "PermissionDenied", "ProtocolError", "RecConError", "RecSelError",
haftmann@28054
   524
      "RecUpdError", "ResourceBusy", "ResourceExhausted", "Right", "StackOverflow",
haftmann@28054
   525
      "ThreadKilled", "True", "TyCon", "TypeRep", "UndefinedElement", "Underflow",
haftmann@28054
   526
      "UnsupportedOperation", "UserError", "abs", "absReal", "acos", "acosh", "all",
haftmann@28054
   527
      "and", "any", "appendFile", "asTypeOf", "asciiTab", "asin", "asinh", "atan",
haftmann@28054
   528
      "atan2", "atanh", "basicIORun", "blockIO", "boundedEnumFrom", "boundedEnumFromThen",
haftmann@28054
   529
      "boundedEnumFromThenTo", "boundedEnumFromTo", "boundedPred", "boundedSucc", "break",
haftmann@28054
   530
      "catch", "catchException", "ceiling", "compare", "concat", "concatMap", "const",
haftmann@28054
   531
      "cos", "cosh", "curry", "cycle", "decodeFloat", "denominator", "div", "divMod",
haftmann@28054
   532
      "doubleToRatio", "doubleToRational", "drop", "dropWhile", "either", "elem",
haftmann@28054
   533
      "emptyRec", "encodeFloat", "enumFrom", "enumFromThen", "enumFromThenTo",
haftmann@28054
   534
      "enumFromTo", "error", "even", "exp", "exponent", "fail", "filter", "flip",
haftmann@28054
   535
      "floatDigits", "floatProperFraction", "floatRadix", "floatRange", "floatToRational",
haftmann@28054
   536
      "floor", "fmap", "foldl", "foldl'", "foldl1", "foldr", "foldr1", "fromDouble",
haftmann@28054
   537
      "fromEnum", "fromEnum_0", "fromInt", "fromInteger", "fromIntegral", "fromObj",
haftmann@28054
   538
      "fromRational", "fst", "gcd", "getChar", "getContents", "getLine", "head",
haftmann@28054
   539
      "id", "inRange", "index", "init", "intToRatio", "interact", "ioError", "isAlpha",
haftmann@28054
   540
      "isAlphaNum", "isDenormalized", "isDigit", "isHexDigit", "isIEEE", "isInfinite",
haftmann@28054
   541
      "isLower", "isNaN", "isNegativeZero", "isOctDigit", "isSpace", "isUpper", "iterate", "iterate'",
haftmann@28054
   542
      "last", "lcm", "length", "lex", "lexDigits", "lexLitChar", "lexmatch", "lines", "log",
haftmann@28054
   543
      "logBase", "lookup", "loop", "map", "mapM", "mapM_", "max", "maxBound", "maximum",
haftmann@28054
   544
      "maybe", "min", "minBound", "minimum", "mod", "negate", "nonnull", "not", "notElem",
haftmann@28054
   545
      "null", "numerator", "numericEnumFrom", "numericEnumFromThen", "numericEnumFromThenTo",
haftmann@28054
   546
      "numericEnumFromTo", "odd", "or", "otherwise", "pi", "pred", 
haftmann@28054
   547
      "print", "product", "properFraction", "protectEsc", "putChar", "putStr", "putStrLn",
haftmann@28054
   548
      "quot", "quotRem", "range", "rangeSize", "rationalToDouble", "rationalToFloat",
haftmann@28054
   549
      "rationalToRealFloat", "read", "readDec", "readField", "readFieldName", "readFile",
haftmann@28054
   550
      "readFloat", "readHex", "readIO", "readInt", "readList", "readLitChar", "readLn",
haftmann@28054
   551
      "readOct", "readParen", "readSigned", "reads", "readsPrec", "realFloatToRational",
haftmann@28054
   552
      "realToFrac", "recip", "reduce", "rem", "repeat", "replicate", "return", "reverse",
haftmann@28054
   553
      "round", "scaleFloat", "scanl", "scanl1", "scanr", "scanr1", "seq", "sequence",
haftmann@28054
   554
      "sequence_", "show", "showChar", "showException", "showField", "showList",
haftmann@28054
   555
      "showLitChar", "showParen", "showString", "shows", "showsPrec", "significand",
haftmann@28054
   556
      "signum", "signumReal", "sin", "sinh", "snd", "span", "splitAt", "sqrt", "subtract",
haftmann@28054
   557
      "succ", "sum", "tail", "take", "takeWhile", "takeWhile1", "tan", "tanh", "threadToIOResult",
haftmann@28054
   558
      "throw", "toEnum", "toInt", "toInteger", "toObj", "toRational", "truncate", "uncurry",
haftmann@28054
   559
      "undefined", "unlines", "unsafeCoerce", "unsafeIndex", "unsafeRangeSize", "until", "unwords",
haftmann@28054
   560
      "unzip", "unzip3", "userError", "words", "writeFile", "zip", "zip3", "zipWith", "zipWith3"
haftmann@28054
   561
    ] (*due to weird handling of ':', we can't do anything else than to import *all* prelude symbols*);
haftmann@28054
   562
haftmann@28054
   563
end; (*struct*)