1 (* Title: Tools/Code/code_haskell.ML
2 Author: Florian Haftmann, TU Muenchen
4 Serializer for Haskell.
7 signature CODE_HASKELL =
10 val setup: theory -> theory
13 structure Code_Haskell : CODE_HASKELL =
16 val target = "Haskell";
18 open Basic_Code_Thingol;
25 (** Haskell serializer **)
27 fun print_haskell_stmt labelled_name class_syntax tyco_syntax const_syntax
28 reserved deresolve contr_classparam_typs deriving_show =
30 fun class_name class = case class_syntax class
31 of NONE => deresolve class
32 | SOME class => class;
33 fun print_typcontext tyvars vs = case maps (fn (v, sort) => map (pair v) sort) vs
35 | constraints => enum "," "(" ")" (
37 str (class_name class ^ " " ^ lookup_var tyvars v)) constraints)
39 fun print_typforall tyvars vs = case map fst vs
41 | vnames => str "forall " :: Pretty.breaks
42 (map (str o lookup_var tyvars) vnames) @ str "." @@ Pretty.brk 1;
43 fun print_tyco_expr tyvars fxy (tyco, tys) =
44 brackify fxy (str tyco :: map (print_typ tyvars BR) tys)
45 and print_typ tyvars fxy (tycoexpr as tyco `%% tys) = (case tyco_syntax tyco
46 of NONE => print_tyco_expr tyvars fxy (deresolve tyco, tys)
47 | SOME (i, print) => print (print_typ tyvars) fxy tys)
48 | print_typ tyvars fxy (ITyVar v) = (str o lookup_var tyvars) v;
49 fun print_typdecl tyvars (vs, tycoexpr) =
50 Pretty.block (print_typcontext tyvars vs @| print_tyco_expr tyvars NOBR tycoexpr);
51 fun print_typscheme tyvars (vs, ty) =
52 Pretty.block (print_typforall tyvars vs @ print_typcontext tyvars vs @| print_typ tyvars NOBR ty);
53 fun print_term tyvars some_thm vars fxy (IConst c) =
54 print_app tyvars some_thm vars fxy (c, [])
55 | print_term tyvars some_thm vars fxy (t as (t1 `$ t2)) =
56 (case Code_Thingol.unfold_const_app t
57 of SOME app => print_app tyvars some_thm vars fxy app
60 print_term tyvars some_thm vars NOBR t1,
61 print_term tyvars some_thm vars BR t2
63 | print_term tyvars some_thm vars fxy (IVar NONE) =
65 | print_term tyvars some_thm vars fxy (IVar (SOME v)) =
66 (str o lookup_var vars) v
67 | print_term tyvars some_thm vars fxy (t as _ `|=> _) =
69 val (binds, t') = Code_Thingol.unfold_pat_abs t;
70 val (ps, vars') = fold_map (print_bind tyvars some_thm BR o fst) binds vars;
71 in brackets (str "\\" :: ps @ str "->" @@ print_term tyvars some_thm vars' NOBR t') end
72 | print_term tyvars some_thm vars fxy (ICase (cases as (_, t0))) =
73 (case Code_Thingol.unfold_const_app t0
74 of SOME (c_ts as ((c, _), _)) => if is_none (const_syntax c)
75 then print_case tyvars some_thm vars fxy cases
76 else print_app tyvars some_thm vars fxy c_ts
77 | NONE => print_case tyvars some_thm vars fxy cases)
78 and print_app_expr tyvars some_thm vars ((c, (_, function_typs)), ts) = case contr_classparam_typs c
79 of [] => (str o deresolve) c :: map (print_term tyvars some_thm vars BR) ts
81 val ts_fingerprint = ts ~~ take (length ts) fingerprint;
82 val needs_annotation = forall (fn (_, NONE) => true | (t, SOME _) =>
83 (not o Code_Thingol.locally_monomorphic) t) ts_fingerprint;
84 fun print_term_anno (t, NONE) _ = print_term tyvars some_thm vars BR t
85 | print_term_anno (t, SOME _) ty =
86 brackets [print_term tyvars some_thm vars NOBR t, str "::", print_typ tyvars NOBR ty];
88 if needs_annotation then
89 (str o deresolve) c :: map2 print_term_anno ts_fingerprint (take (length ts) function_typs)
90 else (str o deresolve) c :: map (print_term tyvars some_thm vars BR) ts
92 and print_app tyvars = gen_print_app (print_app_expr tyvars) (print_term tyvars) const_syntax
93 and print_bind tyvars some_thm fxy p = gen_print_bind (print_term tyvars) some_thm fxy p
94 and print_case tyvars some_thm vars fxy (cases as ((_, [_]), _)) =
96 val (binds, body) = Code_Thingol.unfold_let (ICase cases);
97 fun print_match ((pat, ty), t) vars =
99 |> print_bind tyvars some_thm BR pat
100 |>> (fn p => semicolon [p, str "=", print_term tyvars some_thm vars NOBR t])
101 val (ps, vars') = fold_map print_match binds vars;
102 in brackify_block fxy (str "let {")
104 (concat [str "}", str "in", print_term tyvars some_thm vars' NOBR body])
106 | print_case tyvars some_thm vars fxy (((t, ty), clauses as _ :: _), _) =
108 fun print_select (pat, body) =
110 val (p, vars') = print_bind tyvars some_thm NOBR pat vars;
111 in semicolon [p, str "->", print_term tyvars some_thm vars' NOBR body] end;
112 in Pretty.block_enclose
113 (concat [str "(case", print_term tyvars some_thm vars NOBR t, str "of", str "{"], str "})")
114 (map print_select clauses)
116 | print_case tyvars some_thm vars fxy ((_, []), _) =
117 (brackify fxy o Pretty.breaks o map str) ["error", "\"empty case\""];
118 fun print_stmt (name, Code_Thingol.Fun (_, (((vs, ty), raw_eqs), _))) =
120 val tyvars = intro_vars (map fst vs) reserved;
123 (str o deresolve) name
124 :: map str (replicate n "_")
127 @@ (str o ML_Syntax.print_string
128 o Long_Name.base_name o Long_Name.qualifier) name
130 fun print_eqn ((ts, t), (some_thm, _)) =
132 val consts = fold Code_Thingol.add_constnames (t :: ts) [];
135 (is_none o const_syntax) deresolve consts
136 |> intro_vars ((fold o Code_Thingol.fold_varnames)
137 (insert (op =)) ts []);
140 (str o deresolve) name
141 :: map (print_term tyvars some_thm vars BR) ts
143 @@ print_term tyvars some_thm vars NOBR t
149 (str o suffix " ::" o deresolve) name,
150 print_typscheme tyvars (vs, ty)
152 :: (case filter (snd o snd) raw_eqs
153 of [] => [print_err ((length o fst o Code_Thingol.unfold_fun) ty)]
154 | eqs => map print_eqn eqs)
157 | print_stmt (name, Code_Thingol.Datatype (_, (vs, []))) =
159 val tyvars = intro_vars (map fst vs) reserved;
163 print_typdecl tyvars (vs, (deresolve name, map (ITyVar o fst) vs))
166 | print_stmt (name, Code_Thingol.Datatype (_, (vs, [((co, _), [ty])]))) =
168 val tyvars = intro_vars (map fst vs) reserved;
172 :: print_typdecl tyvars (vs, (deresolve name, map (ITyVar o fst) vs))
174 :: (str o deresolve) co
175 :: print_typ tyvars BR ty
176 :: (if deriving_show name then [str "deriving (Read, Show)"] else [])
179 | print_stmt (name, Code_Thingol.Datatype (_, (vs, co :: cos))) =
181 val tyvars = intro_vars (map fst vs) reserved;
182 fun print_co ((co, _), tys) =
185 :: map (print_typ tyvars BR) tys
190 :: print_typdecl tyvars (vs, (deresolve name, map (ITyVar o fst) vs))
193 :: map ((fn p => Pretty.block [str "| ", p]) o print_co) cos
194 @ (if deriving_show name then [str "deriving (Read, Show)"] else [])
197 | print_stmt (name, Code_Thingol.Class (_, (v, (super_classes, classparams)))) =
199 val tyvars = intro_vars [v] reserved;
200 fun print_classparam (classparam, ty) =
202 (str o deresolve) classparam,
204 print_typ tyvars NOBR ty
207 Pretty.block_enclose (
210 Pretty.block (print_typcontext tyvars [(v, map fst super_classes)]),
211 str (deresolve name ^ " " ^ lookup_var tyvars v),
215 ) (map print_classparam classparams)
217 | print_stmt (_, Code_Thingol.Classinst ((class, (tyco, vs)), (_, (classparam_instances, _)))) =
219 val tyvars = intro_vars (map fst vs) reserved;
220 fun requires_args classparam = case const_syntax classparam
222 | SOME (Code_Printer.Plain_const_syntax _) => SOME 0
223 | SOME (Code_Printer.Complex_const_syntax (k,_ )) => SOME k;
224 fun print_classparam_instance ((classparam, const), (thm, _)) =
225 case requires_args classparam
226 of NONE => semicolon [
227 (str o Long_Name.base_name o deresolve) classparam,
229 print_app tyvars (SOME thm) reserved NOBR (const, [])
233 val (c, (_, tys)) = const;
234 val (vs, rhs) = (apfst o map) fst
235 (Code_Thingol.unfold_abs (Code_Thingol.eta_expand k (const, [])));
236 val s = if (is_some o const_syntax) c
237 then NONE else (SOME o Long_Name.base_name o deresolve) c;
239 |> intro_vars (map_filter I (s :: vs));
240 val lhs = IConst (classparam, (([], []), tys)) `$$ map IVar vs;
241 (*dictionaries are not relevant at this late stage*)
244 print_term tyvars (SOME thm) vars NOBR lhs,
246 print_term tyvars (SOME thm) vars NOBR rhs
250 Pretty.block_enclose (
253 Pretty.block (print_typcontext tyvars vs),
254 str (class_name class ^ " "),
255 print_typ tyvars BR (tyco `%% map (ITyVar o fst) vs),
259 ) (map print_classparam_instance classparam_instances)
263 fun haskell_program_of_program labelled_name module_alias module_prefix reserved =
265 fun namify_fun upper base (nsp_fun, nsp_typ) =
267 val (base', nsp_fun') =
268 Name.variant (if upper then first_upper base else base) nsp_fun;
269 in (base', (nsp_fun', nsp_typ)) end;
270 fun namify_typ base (nsp_fun, nsp_typ) =
272 val (base', nsp_typ') = Name.variant (first_upper base) nsp_typ;
273 in (base', (nsp_fun, nsp_typ')) end;
274 fun namify_stmt (Code_Thingol.Fun (_, (_, SOME _))) = pair
275 | namify_stmt (Code_Thingol.Fun _) = namify_fun false
276 | namify_stmt (Code_Thingol.Datatype _) = namify_typ
277 | namify_stmt (Code_Thingol.Datatypecons _) = namify_fun true
278 | namify_stmt (Code_Thingol.Class _) = namify_typ
279 | namify_stmt (Code_Thingol.Classrel _) = pair
280 | namify_stmt (Code_Thingol.Classparam _) = namify_fun false
281 | namify_stmt (Code_Thingol.Classinst _) = pair;
282 fun select_stmt (Code_Thingol.Fun (_, (_, SOME _))) = false
283 | select_stmt (Code_Thingol.Fun _) = true
284 | select_stmt (Code_Thingol.Datatype _) = true
285 | select_stmt (Code_Thingol.Datatypecons _) = false
286 | select_stmt (Code_Thingol.Class _) = true
287 | select_stmt (Code_Thingol.Classrel _) = false
288 | select_stmt (Code_Thingol.Classparam _) = false
289 | select_stmt (Code_Thingol.Classinst _) = true;
291 Code_Namespace.flat_program labelled_name
292 { module_alias = module_alias, module_prefix = module_prefix,
293 reserved = reserved, empty_nsp = (reserved, reserved), namify_stmt = namify_stmt,
294 modify_stmt = fn stmt => if select_stmt stmt then SOME stmt else NONE }
297 fun serialize_haskell module_prefix string_classes { labelled_name, reserved_syms,
298 includes, module_alias, class_syntax, tyco_syntax, const_syntax } program =
302 val reserved = fold (insert (op =) o fst) includes reserved_syms;
303 val { deresolver, flat_program = haskell_program } = haskell_program_of_program
304 labelled_name module_alias module_prefix (Name.make_context reserved) program;
306 (* print statements *)
307 val contr_classparam_typs = Code_Thingol.contr_classparam_typs program;
308 fun deriving_show tyco =
310 fun deriv _ "fun" = false
311 | deriv tycos tyco = not (tyco = Code_Thingol.fun_tyco)
312 andalso (member (op =) tycos tyco
313 orelse case try (Graph.get_node program) tyco
314 of SOME (Code_Thingol.Datatype (_, (_, cs))) => forall (deriv' (tyco :: tycos))
317 and deriv' tycos (tyco `%% tys) = deriv tycos tyco
318 andalso forall (deriv' tycos) tys
319 | deriv' _ (ITyVar _) = true
320 in deriv [] tyco end;
321 fun print_stmt deresolve = print_haskell_stmt labelled_name
322 class_syntax tyco_syntax const_syntax (make_vars reserved)
323 deresolve contr_classparam_typs
324 (if string_classes then deriving_show else K false);
327 val import_includes_ps =
328 map (fn (name, _) => str ("import qualified " ^ name ^ ";")) includes;
329 fun print_module_frame module_name ps =
330 (module_name, Pretty.chunks2 (
331 str ("module " ^ module_name ^ " where {")
335 fun print_module module_name (gr, imports) =
337 val deresolve = deresolver module_name
338 fun print_import module_name = (semicolon o map str) ["import qualified", module_name];
339 val import_ps = import_includes_ps @ map (print_import o fst) imports;
340 fun print_stmt' gr name = case Graph.get_node gr name
342 | (_, SOME stmt) => SOME (markup_stmt name (print_stmt deresolve (name, stmt)));
343 val body_ps = map_filter (print_stmt' gr) ((flat o rev o Graph.strong_conn) gr);
345 print_module_frame module_name
346 ((if null import_ps then [] else [Pretty.chunks import_ps]) @ body_ps)
350 fun write_module width (SOME destination) (module_name, content) =
352 val _ = File.check_dir destination;
353 val filepath = (Path.append destination o Path.ext "hs" o Path.explode o implode
354 o separate "/" o Long_Name.explode) module_name;
355 val _ = Isabelle_System.mkdirs (Path.dir filepath);
357 (File.write filepath o format [] width o Pretty.chunks2)
358 [str "{-# LANGUAGE ScopedTypeVariables #-}", content]
360 | write_module width NONE (_, content) = writeln (format [] width content);
362 Code_Target.serialization
363 (fn width => fn destination => K () o map (write_module width destination))
364 (fn present => fn width => rpair (try (deresolver ""))
365 o format present width o Pretty.chunks o map snd)
366 (map (uncurry print_module_frame o apsnd single) includes
367 @ map (fn module_name => print_module module_name (Graph.get_node haskell_program module_name))
368 ((flat o rev o Graph.strong_conn) haskell_program))
371 val serializer : Code_Target.serializer =
372 Code_Target.parse_args (Scan.optional (Args.$$$ "root" -- Args.colon |-- Args.name) ""
373 -- Scan.optional (Args.$$$ "string_classes" >> K true) false
374 >> (fn (module_prefix, string_classes) =>
375 serialize_haskell module_prefix string_classes));
380 val s = ML_Syntax.print_char c;
381 in if s = "'" then "\\'" else s end;
382 fun numeral_haskell k = if k >= 0 then string_of_int k
383 else Library.enclose "(" ")" (signed_string_of_int k);
385 literal_char = Library.enclose "'" "'" o char_haskell,
386 literal_string = quote o translate_string char_haskell,
387 literal_numeral = numeral_haskell,
388 literal_positive_numeral = numeral_haskell,
389 literal_alternative_numeral = numeral_haskell,
390 literal_naive_numeral = numeral_haskell,
391 literal_list = enum "," "[" "]",
392 infix_cons = (5, ":")
396 (** optional monad syntax **)
398 fun pretty_haskell_monad c_bind =
400 fun dest_bind t1 t2 = case Code_Thingol.split_pat_abs t2
401 of SOME ((pat, ty), t') =>
402 SOME ((SOME ((pat, ty), true), t1), t')
404 fun dest_monad c_bind_name (IConst (c, _) `$ t1 `$ t2) =
405 if c = c_bind_name then dest_bind t1 t2
407 | dest_monad _ t = case Code_Thingol.split_let t
408 of SOME (((pat, ty), tbind), t') =>
409 SOME ((SOME ((pat, ty), false), tbind), t')
411 fun implode_monad c_bind_name = Code_Thingol.unfoldr (dest_monad c_bind_name);
412 fun print_monad print_bind print_term (NONE, t) vars =
413 (semicolon [print_term vars NOBR t], vars)
414 | print_monad print_bind print_term (SOME ((bind, _), true), t) vars = vars
415 |> print_bind NOBR bind
416 |>> (fn p => semicolon [p, str "<-", print_term vars NOBR t])
417 | print_monad print_bind print_term (SOME ((bind, _), false), t) vars = vars
418 |> print_bind NOBR bind
419 |>> (fn p => semicolon [str "let", str "{", p, str "=", print_term vars NOBR t, str "}"]);
420 fun pretty _ [c_bind'] print_term thm vars fxy [(t1, _), (t2, _)] = case dest_bind t1 t2
421 of SOME (bind, t') => let
422 val (binds, t'') = implode_monad c_bind' t'
423 val (ps, vars') = fold_map (print_monad (gen_print_bind (K print_term) thm) print_term)
424 (bind :: binds) vars;
426 (brackify fxy o single o enclose "do { " " }" o Pretty.breaks)
427 (ps @| print_term vars' NOBR t'')
429 | NONE => brackify_infix (1, L) fxy
430 (print_term vars (INFX (1, L)) t1, str ">>=", print_term vars (INFX (1, X)) t2)
431 in (2, ([c_bind], pretty)) end;
433 fun add_monad target' raw_c_bind thy =
435 val c_bind = Code.read_const thy raw_c_bind;
436 in if target = target' then
438 |> Code_Target.add_const_syntax target c_bind
439 (SOME (Code_Printer.complex_const_syntax (pretty_haskell_monad c_bind)))
440 else error "Only Haskell target allows for monad syntax" end;
446 Outer_Syntax.command "code_monad" "define code syntax for monads" Keyword.thy_decl (
447 Parse.term_group -- Parse.name >> (fn (raw_bind, target) =>
448 Toplevel.theory (add_monad target raw_bind))
452 Code_Target.add_target
453 (target, { serializer = serializer, literals = literals,
454 check = { env_var = "ISABELLE_GHC", make_destination = I,
455 make_command = fn module_name =>
456 "\"$ISABELLE_GHC\" -fglasgow-exts -odir build -hidir build -stubdir build -e \"\" " ^
457 module_name ^ ".hs" } })
458 #> Code_Target.add_tyco_syntax target "fun" (SOME (2, fn print_typ => fn fxy => fn [ty1, ty2] =>
459 brackify_infix (1, R) fxy (
460 print_typ (INFX (1, X)) ty1,
462 print_typ (INFX (1, R)) ty2
464 #> fold (Code_Target.add_reserved target) [
465 "hiding", "deriving", "where", "case", "of", "infix", "infixl", "infixr",
466 "import", "default", "forall", "let", "in", "class", "qualified", "data",
467 "newtype", "instance", "if", "then", "else", "type", "as", "do", "module"
469 #> fold (Code_Target.add_reserved target) [
470 "Prelude", "Main", "Bool", "Maybe", "Either", "Ordering", "Char", "String", "Int",
471 "Integer", "Float", "Double", "Rational", "IO", "Eq", "Ord", "Enum", "Bounded",
472 "Num", "Real", "Integral", "Fractional", "Floating", "RealFloat", "Monad", "Functor",
473 "AlreadyExists", "ArithException", "ArrayException", "AssertionFailed", "AsyncException",
474 "BlockedOnDeadMVar", "Deadlock", "Denormal", "DivideByZero", "DotNetException", "DynException",
475 "Dynamic", "EOF", "EQ", "EmptyRec", "ErrorCall", "ExitException", "ExitFailure",
476 "ExitSuccess", "False", "GT", "HeapOverflow",
477 "IOError", "IOException", "IllegalOperation",
478 "IndexOutOfBounds", "Just", "Key", "LT", "Left", "LossOfPrecision", "NoMethodError",
479 "NoSuchThing", "NonTermination", "Nothing", "Obj", "OtherError", "Overflow",
480 "PatternMatchFail", "PermissionDenied", "ProtocolError", "RecConError", "RecSelError",
481 "RecUpdError", "ResourceBusy", "ResourceExhausted", "Right", "StackOverflow",
482 "ThreadKilled", "True", "TyCon", "TypeRep", "UndefinedElement", "Underflow",
483 "UnsupportedOperation", "UserError", "abs", "absReal", "acos", "acosh", "all",
484 "and", "any", "appendFile", "asTypeOf", "asciiTab", "asin", "asinh", "atan",
485 "atan2", "atanh", "basicIORun", "blockIO", "boundedEnumFrom", "boundedEnumFromThen",
486 "boundedEnumFromThenTo", "boundedEnumFromTo", "boundedPred", "boundedSucc", "break",
487 "catch", "catchException", "ceiling", "compare", "concat", "concatMap", "const",
488 "cos", "cosh", "curry", "cycle", "decodeFloat", "denominator", "div", "divMod",
489 "doubleToRatio", "doubleToRational", "drop", "dropWhile", "either", "elem",
490 "emptyRec", "encodeFloat", "enumFrom", "enumFromThen", "enumFromThenTo",
491 "enumFromTo", "error", "even", "exp", "exponent", "fail", "filter", "flip",
492 "floatDigits", "floatProperFraction", "floatRadix", "floatRange", "floatToRational",
493 "floor", "fmap", "foldl", "foldl'", "foldl1", "foldr", "foldr1", "fromDouble",
494 "fromEnum", "fromEnum_0", "fromInt", "fromInteger", "fromIntegral", "fromObj",
495 "fromRational", "fst", "gcd", "getChar", "getContents", "getLine", "head",
496 "id", "inRange", "index", "init", "intToRatio", "interact", "ioError", "isAlpha",
497 "isAlphaNum", "isDenormalized", "isDigit", "isHexDigit", "isIEEE", "isInfinite",
498 "isLower", "isNaN", "isNegativeZero", "isOctDigit", "isSpace", "isUpper", "iterate", "iterate'",
499 "last", "lcm", "length", "lex", "lexDigits", "lexLitChar", "lexmatch", "lines", "log",
500 "logBase", "lookup", "loop", "map", "mapM", "mapM_", "max", "maxBound", "maximum",
501 "maybe", "min", "minBound", "minimum", "mod", "negate", "nonnull", "not", "notElem",
502 "null", "numerator", "numericEnumFrom", "numericEnumFromThen", "numericEnumFromThenTo",
503 "numericEnumFromTo", "odd", "or", "otherwise", "pi", "pred",
504 "print", "product", "properFraction", "protectEsc", "putChar", "putStr", "putStrLn",
505 "quot", "quotRem", "range", "rangeSize", "rationalToDouble", "rationalToFloat",
506 "rationalToRealFloat", "read", "readDec", "readField", "readFieldName", "readFile",
507 "readFloat", "readHex", "readIO", "readInt", "readList", "readLitChar", "readLn",
508 "readOct", "readParen", "readSigned", "reads", "readsPrec", "realFloatToRational",
509 "realToFrac", "recip", "reduce", "rem", "repeat", "replicate", "return", "reverse",
510 "round", "scaleFloat", "scanl", "scanl1", "scanr", "scanr1", "seq", "sequence",
511 "sequence_", "show", "showChar", "showException", "showField", "showList",
512 "showLitChar", "showParen", "showString", "shows", "showsPrec", "significand",
513 "signum", "signumReal", "sin", "sinh", "snd", "span", "splitAt", "sqrt", "subtract",
514 "succ", "sum", "tail", "take", "takeWhile", "takeWhile1", "tan", "tanh", "threadToIOResult",
515 "throw", "toEnum", "toInt", "toInteger", "toObj", "toRational", "truncate", "uncurry",
516 "undefined", "unlines", "unsafeCoerce", "unsafeIndex", "unsafeRangeSize", "until", "unwords",
517 "unzip", "unzip3", "userError", "words", "writeFile", "zip", "zip3", "zipWith", "zipWith3"
518 ] (*due to weird handling of ':', we can't do anything else than to import *all* prelude symbols*);