author | nipkow |
Fri, 05 Aug 2005 12:20:30 +0200 | |
changeset 17022 | b257300c3a9c |
parent 16645 | a152d6b21c31 |
child 17144 | 6642e0f96f44 |
permissions | -rw-r--r-- |
12446 | 1 |
(* Title: HOL/datatype_codegen.ML |
12445 | 2 |
ID: $Id$ |
3 |
Author: Stefan Berghofer, TU Muenchen |
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Code generator for inductive datatypes. |
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*) |
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signature DATATYPE_CODEGEN = |
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sig |
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val setup: (theory -> theory) list |
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end; |
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structure DatatypeCodegen : DATATYPE_CODEGEN = |
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struct |
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open Codegen; |
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fun mk_tuple [p] = p |
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| mk_tuple ps = Pretty.block (Pretty.str "(" :: |
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List.concat (separate [Pretty.str ",", Pretty.brk 1] (map single ps)) @ |
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[Pretty.str ")"]); |
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(**** datatype definition ****) |
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(* find shortest path to constructor with no recursive arguments *) |
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fun find_nonempty (descr: DatatypeAux.descr) is i = |
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let |
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val (_, _, constrs) = valOf (assoc (descr, i)); |
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fun arg_nonempty (_, DatatypeAux.DtRec i) = if i mem is then NONE |
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else Option.map (curry op + 1 o snd) (find_nonempty descr (i::is) i) |
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| arg_nonempty _ = SOME 0; |
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fun max xs = Library.foldl |
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(fn (NONE, _) => NONE |
35 |
| (SOME i, SOME j) => SOME (Int.max (i, j)) |
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| (_, NONE) => NONE) (SOME 0, xs); |
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val xs = sort (int_ord o pairself snd) |
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(List.mapPartial (fn (s, dts) => Option.map (pair s) |
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(max (map (arg_nonempty o DatatypeAux.strip_dtyp) dts))) constrs) |
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in case xs of [] => NONE | x :: _ => SOME x end; |
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|
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fun add_dt_defs thy defs dep gr (descr: DatatypeAux.descr) = |
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let |
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val sg = sign_of thy; |
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val tab = DatatypePackage.get_datatypes thy; |
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val descr' = List.filter (can (map DatatypeAux.dest_DtTFree o #2 o snd)) descr; |
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val rtnames = map (#1 o snd) (List.filter (fn (_, (_, _, cs)) => |
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exists (exists DatatypeAux.is_rec_type o snd) cs) descr'); |
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val (_, (tname, _, (dname, _) :: _)) :: _ = descr'; |
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val thyname = thyname_of_type tname thy; |
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fun mk_dtdef gr prfx [] = (gr, []) |
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| mk_dtdef gr prfx ((_, (tname, dts, cs))::xs) = |
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let |
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val tvs = map DatatypeAux.dest_DtTFree dts; |
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val sorts = map (rpair []) tvs; |
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val cs' = map (apsnd (map (DatatypeAux.typ_of_dtyp descr sorts))) cs; |
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val (gr', ps) = foldl_map (fn (gr, (cname, cargs)) => |
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apsnd (pair cname) (foldl_map |
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(invoke_tycodegen thy defs dname thyname false) (gr, cargs))) (gr, cs'); |
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val (gr'', rest) = mk_dtdef gr' "and " xs |
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in |
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(gr'', |
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Pretty.block (Pretty.str prfx :: |
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(if null tvs then [] else |
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[mk_tuple (map Pretty.str tvs), Pretty.str " "]) @ |
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[Pretty.str (mk_type_id sg thyname thyname tname ^ " ="), Pretty.brk 1] @ |
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List.concat (separate [Pretty.brk 1, Pretty.str "| "] |
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(map (fn (cname, ps') => [Pretty.block |
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(Pretty.str (mk_const_id sg thyname thyname cname) :: |
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(if null ps' then [] else |
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List.concat ([Pretty.str " of", Pretty.brk 1] :: |
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separate [Pretty.str " *", Pretty.brk 1] |
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(map single ps'))))]) ps))) :: rest) |
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021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
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end; |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
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021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
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parents:
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fun mk_term_of_def prfx [] = [] |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
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parents:
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| mk_term_of_def prfx ((_, (tname, dts, cs)) :: xs) = |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
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let |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
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val tvs = map DatatypeAux.dest_DtTFree dts; |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
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val sorts = map (rpair []) tvs; |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
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val cs' = map (apsnd (map (DatatypeAux.typ_of_dtyp descr sorts))) cs; |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
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val dts' = map (DatatypeAux.typ_of_dtyp descr sorts) dts; |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
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val T = Type (tname, dts'); |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
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val rest = mk_term_of_def "and " xs; |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
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val (_, eqs) = foldl_map (fn (prfx, (cname, Ts)) => |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
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let val args = map (fn i => |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
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Pretty.str ("x" ^ string_of_int i)) (1 upto length Ts) |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
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in (" | ", Pretty.blk (4, |
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[Pretty.str prfx, mk_term_of thy thyname false T, Pretty.brk 1, |
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if null Ts then Pretty.str (mk_const_id sg thyname thyname cname) |
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else parens (Pretty.block |
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[Pretty.str (mk_const_id sg thyname thyname cname), |
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13754
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
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changeset
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Pretty.brk 1, mk_tuple args]), |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
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Pretty.str " =", Pretty.brk 1] @ |
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List.concat (separate [Pretty.str " $", Pretty.brk 1] |
13754
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
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([Pretty.str ("Const (\"" ^ cname ^ "\","), Pretty.brk 1, |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
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changeset
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mk_type false (Ts ---> T), Pretty.str ")"] :: |
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map (fn (x, U) => [Pretty.block [mk_term_of thy thyname false U, |
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021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
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parents:
12890
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Pretty.brk 1, x]]) (args ~~ Ts))))) |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
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changeset
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end) (prfx, cs') |
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in eqs @ rest end; |
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fun mk_gen_of_def prfx [] = [] |
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| mk_gen_of_def prfx ((i, (tname, dts, cs)) :: xs) = |
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let |
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val tvs = map DatatypeAux.dest_DtTFree dts; |
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val sorts = map (rpair []) tvs; |
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val (cs1, cs2) = |
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List.partition (exists DatatypeAux.is_rec_type o snd) cs; |
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val SOME (cname, _) = find_nonempty descr [i] i; |
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fun mk_delay p = Pretty.block |
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[Pretty.str "fn () =>", Pretty.brk 1, p]; |
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5260ac75e07c
Fixed bug in mk_gen_of_def that could cause non-termination of the generator
berghofe
parents:
14981
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changeset
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fun mk_constr s b (cname, dts) = |
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let |
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val gs = map (fn dt => mk_app false (mk_gen thy thyname false rtnames s |
15397
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Fixed bug in mk_gen_of_def that could cause non-termination of the generator
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parents:
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(DatatypeAux.typ_of_dtyp descr sorts dt)) |
5260ac75e07c
Fixed bug in mk_gen_of_def that could cause non-termination of the generator
berghofe
parents:
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changeset
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[Pretty.str (if b andalso DatatypeAux.is_rec_type dt then "0" |
5260ac75e07c
Fixed bug in mk_gen_of_def that could cause non-termination of the generator
berghofe
parents:
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changeset
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else "j")]) dts; |
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val id = mk_const_id sg thyname thyname cname |
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in case gs of |
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_ :: _ :: _ => Pretty.block |
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[Pretty.str id, Pretty.brk 1, mk_tuple gs] |
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| _ => mk_app false (Pretty.str id) (map parens gs) |
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end; |
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5260ac75e07c
Fixed bug in mk_gen_of_def that could cause non-termination of the generator
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parents:
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changeset
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fun mk_choice [c] = mk_constr "(i-1)" false c |
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| mk_choice cs = Pretty.block [Pretty.str "one_of", |
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Pretty.brk 1, Pretty.blk (1, Pretty.str "[" :: |
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List.concat (separate [Pretty.str ",", Pretty.fbrk] |
15397
5260ac75e07c
Fixed bug in mk_gen_of_def that could cause non-termination of the generator
berghofe
parents:
14981
diff
changeset
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(map (single o mk_delay o mk_constr "(i-1)" false) cs)) @ |
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[Pretty.str "]"]), Pretty.brk 1, Pretty.str "()"]; |
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val gs = map (Pretty.str o suffix "G" o strip_tname) tvs; |
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val gen_name = "gen_" ^ mk_type_id sg thyname thyname tname |
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in |
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Pretty.blk (4, separate (Pretty.brk 1) |
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(Pretty.str (prfx ^ gen_name ^ |
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(if null cs1 then "" else "'")) :: gs @ |
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(if null cs1 then [] else [Pretty.str "i"]) @ |
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[Pretty.str "j"]) @ |
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[Pretty.str " =", Pretty.brk 1] @ |
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(if not (null cs1) andalso not (null cs2) |
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then [Pretty.str "frequency", Pretty.brk 1, |
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Pretty.blk (1, [Pretty.str "[", |
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mk_tuple [Pretty.str "i", mk_delay (mk_choice cs1)], |
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Pretty.str ",", Pretty.fbrk, |
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mk_tuple [Pretty.str "1", mk_delay (mk_choice cs2)], |
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Pretty.str "]"]), Pretty.brk 1, Pretty.str "()"] |
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else if null cs2 then |
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[Pretty.block [Pretty.str "(case", Pretty.brk 1, |
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Pretty.str "i", Pretty.brk 1, Pretty.str "of", |
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Pretty.brk 1, Pretty.str "0 =>", Pretty.brk 1, |
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mk_constr "0" true (cname, valOf (assoc (cs, cname))), |
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Pretty.brk 1, Pretty.str "| _ =>", Pretty.brk 1, |
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mk_choice cs1, Pretty.str ")"]] |
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else [mk_choice cs2])) :: |
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(if null cs1 then [] |
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else [Pretty.blk (4, separate (Pretty.brk 1) |
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(Pretty.str ("and " ^ gen_name) :: gs @ [Pretty.str "i"]) @ |
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[Pretty.str " =", Pretty.brk 1] @ |
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separate (Pretty.brk 1) (Pretty.str (gen_name ^ "'") :: gs @ |
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[Pretty.str "i", Pretty.str "i"]))]) @ |
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mk_gen_of_def "and " xs |
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end |
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13754
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
171 |
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12445 | 172 |
in |
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((Graph.add_edge_acyclic (dname, dep) gr |
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handle Graph.CYCLES _ => gr) handle Graph.UNDEF _ => |
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let |
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val gr1 = Graph.add_edge (dname, dep) |
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(Graph.new_node (dname, (NONE, "", "")) gr); |
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val (gr2, dtdef) = mk_dtdef gr1 "datatype " descr'; |
179 |
in |
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Graph.map_node dname (K (NONE, thyname, |
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Pretty.string_of (Pretty.blk (0, separate Pretty.fbrk dtdef @ |
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021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
182 |
[Pretty.str ";"])) ^ "\n\n" ^ |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
183 |
(if "term_of" mem !mode then |
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
184 |
Pretty.string_of (Pretty.blk (0, separate Pretty.fbrk |
14104 | 185 |
(mk_term_of_def "fun " descr') @ [Pretty.str ";"])) ^ "\n\n" |
186 |
else "") ^ |
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(if "test" mem !mode then |
|
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Pretty.string_of (Pretty.blk (0, separate Pretty.fbrk |
|
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(mk_gen_of_def "fun " descr') @ [Pretty.str ";"])) ^ "\n\n" |
|
13754
021cf00435a9
Code generator for datatypes now also generates suitable term_of functions (when
berghofe
parents:
12890
diff
changeset
|
190 |
else ""))) gr2 |
16645 | 191 |
end, thyname) |
12445 | 192 |
end; |
193 |
||
194 |
||
195 |
(**** case expressions ****) |
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196 |
||
16645 | 197 |
fun pretty_case thy defs gr dep thyname brack constrs (c as Const (_, T)) ts = |
12445 | 198 |
let val i = length constrs |
199 |
in if length ts <= i then |
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16645 | 200 |
invoke_codegen thy defs dep thyname brack (gr, eta_expand c ts (i+1)) |
12445 | 201 |
else |
202 |
let |
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15570 | 203 |
val ts1 = Library.take (i, ts); |
204 |
val t :: ts2 = Library.drop (i, ts); |
|
15574
b1d1b5bfc464
Removed practically all references to Library.foldr.
skalberg
parents:
15570
diff
changeset
|
205 |
val names = foldr add_term_names |
b1d1b5bfc464
Removed practically all references to Library.foldr.
skalberg
parents:
15570
diff
changeset
|
206 |
(map (fst o fst o dest_Var) (foldr add_term_vars [] ts1)) ts1; |
15570 | 207 |
val (Ts, dT) = split_last (Library.take (i+1, fst (strip_type T))); |
12445 | 208 |
|
209 |
fun pcase gr [] [] [] = ([], gr) |
|
210 |
| pcase gr ((cname, cargs)::cs) (t::ts) (U::Us) = |
|
211 |
let |
|
212 |
val j = length cargs; |
|
213 |
val xs = variantlist (replicate j "x", names); |
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val Us' = Library.take (j, fst (strip_type U)); |
12445 | 215 |
val frees = map Free (xs ~~ Us'); |
16645 | 216 |
val (gr0, cp) = invoke_codegen thy defs dep thyname false |
12445 | 217 |
(gr, list_comb (Const (cname, Us' ---> dT), frees)); |
218 |
val t' = Envir.beta_norm (list_comb (t, frees)); |
|
16645 | 219 |
val (gr1, p) = invoke_codegen thy defs dep thyname false (gr0, t'); |
12445 | 220 |
val (ps, gr2) = pcase gr1 cs ts Us; |
221 |
in |
|
222 |
([Pretty.block [cp, Pretty.str " =>", Pretty.brk 1, p]] :: ps, gr2) |
|
223 |
end; |
|
224 |
||
225 |
val (ps1, gr1) = pcase gr constrs ts1 Ts; |
|
15570 | 226 |
val ps = List.concat (separate [Pretty.brk 1, Pretty.str "| "] ps1); |
16645 | 227 |
val (gr2, p) = invoke_codegen thy defs dep thyname false (gr1, t); |
228 |
val (gr3, ps2) = foldl_map (invoke_codegen thy defs dep thyname true) (gr2, ts2) |
|
12445 | 229 |
in (gr3, (if not (null ts2) andalso brack then parens else I) |
230 |
(Pretty.block (separate (Pretty.brk 1) |
|
231 |
(Pretty.block ([Pretty.str "(case ", p, Pretty.str " of", |
|
232 |
Pretty.brk 1] @ ps @ [Pretty.str ")"]) :: ps2)))) |
|
233 |
end |
|
234 |
end; |
|
235 |
||
236 |
||
237 |
(**** constructors ****) |
|
238 |
||
16645 | 239 |
fun pretty_constr thy defs gr dep thyname brack args (c as Const (s, T)) ts = |
12445 | 240 |
let val i = length args |
241 |
in if i > 1 andalso length ts < i then |
|
16645 | 242 |
invoke_codegen thy defs dep thyname brack (gr, eta_expand c ts i) |
12445 | 243 |
else |
244 |
let |
|
16645 | 245 |
val thyname' = thyname_of_type (fst (dest_Type (body_type T))) thy; |
246 |
val id = mk_const_id (sign_of thy) thyname thyname' s; |
|
247 |
val (gr', ps) = foldl_map |
|
248 |
(invoke_codegen thy defs dep thyname (i = 1)) (gr, ts); |
|
12445 | 249 |
in (case args of |
250 |
_ :: _ :: _ => (gr', (if brack then parens else I) |
|
251 |
(Pretty.block [Pretty.str id, Pretty.brk 1, mk_tuple ps])) |
|
252 |
| _ => (gr', mk_app brack (Pretty.str id) ps)) |
|
253 |
end |
|
254 |
end; |
|
255 |
||
256 |
||
257 |
(**** code generators for terms and types ****) |
|
258 |
||
16645 | 259 |
fun datatype_codegen thy defs gr dep thyname brack t = (case strip_comb t of |
12445 | 260 |
(c as Const (s, T), ts) => |
261 |
(case find_first (fn (_, {index, descr, case_name, ...}) => |
|
262 |
s = case_name orelse |
|
15570 | 263 |
isSome (assoc (#3 (valOf (assoc (descr, index))), s))) |
12445 | 264 |
(Symtab.dest (DatatypePackage.get_datatypes thy)) of |
15531 | 265 |
NONE => NONE |
266 |
| SOME (tname, {index, descr, ...}) => |
|
15570 | 267 |
if isSome (get_assoc_code thy s T) then NONE else |
15531 | 268 |
let val SOME (_, _, constrs) = assoc (descr, index) |
12822
073116d65bb9
datatype_codegen now checks type of constructor.
berghofe
parents:
12446
diff
changeset
|
269 |
in (case (assoc (constrs, s), strip_type T) of |
16645 | 270 |
(NONE, _) => SOME (pretty_case thy defs gr dep thyname brack |
15570 | 271 |
(#3 (valOf (assoc (descr, index)))) c ts) |
16645 | 272 |
| (SOME args, (_, Type _)) => SOME (pretty_constr thy defs |
273 |
(fst (invoke_tycodegen thy defs dep thyname false |
|
274 |
(gr, snd (strip_type T)))) |
|
275 |
dep thyname brack args c ts) |
|
15531 | 276 |
| _ => NONE) |
12445 | 277 |
end) |
15531 | 278 |
| _ => NONE); |
12445 | 279 |
|
16645 | 280 |
fun datatype_tycodegen thy defs gr dep thyname brack (Type (s, Ts)) = |
12445 | 281 |
(case Symtab.lookup (DatatypePackage.get_datatypes thy, s) of |
15531 | 282 |
NONE => NONE |
283 |
| SOME {descr, ...} => |
|
15570 | 284 |
if isSome (get_assoc_type thy s) then NONE else |
16645 | 285 |
let |
286 |
val (gr', ps) = foldl_map |
|
287 |
(invoke_tycodegen thy defs dep thyname false) (gr, Ts); |
|
288 |
val (gr'', thyname') = add_dt_defs thy defs dep gr' descr |
|
289 |
in SOME (gr'', |
|
12445 | 290 |
Pretty.block ((if null Ts then [] else |
291 |
[mk_tuple ps, Pretty.str " "]) @ |
|
16645 | 292 |
[Pretty.str (mk_type_id (sign_of thy) thyname thyname' s)])) |
12445 | 293 |
end) |
16645 | 294 |
| datatype_tycodegen _ _ _ _ _ _ _ = NONE; |
12445 | 295 |
|
296 |
||
297 |
val setup = |
|
298 |
[add_codegen "datatype" datatype_codegen, |
|
299 |
add_tycodegen "datatype" datatype_tycodegen]; |
|
300 |
||
301 |
end; |