1 (* Copyright (C) 2005, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
30 module Ast = CicNotationPt
31 module Env = CicNotationEnv
33 exception Parse_error of string
34 exception Level_not_found of int
36 let min_precedence = 0
37 let max_precedence = 100
39 type ('a,'b,'c,'d) grammars = {
40 level1_pattern: 'a Grammar.Entry.e;
41 level2_ast: 'b Grammar.Entry.e;
42 level2_ast_grammar : Grammar.g;
43 term: 'b Grammar.Entry.e;
44 let_defs: 'c Grammar.Entry.e;
45 protected_binder_vars: 'd Grammar.Entry.e;
46 level2_meta: 'b Grammar.Entry.e;
49 let initial_grammars () =
50 let level1_pattern_grammar =
51 Grammar.gcreate (CicNotationLexer.level1_pattern_lexer ()) in
52 let level2_ast_grammar =
53 Grammar.gcreate (CicNotationLexer.level2_ast_lexer ()) in
54 let level2_meta_grammar =
55 Grammar.gcreate (CicNotationLexer.level2_meta_lexer ()) in
57 Grammar.Entry.create level1_pattern_grammar "level1_pattern" in
58 let level2_ast = Grammar.Entry.create level2_ast_grammar "level2_ast" in
59 let term = Grammar.Entry.create level2_ast_grammar "term" in
60 let let_defs = Grammar.Entry.create level2_ast_grammar "let_defs" in
61 let protected_binder_vars =
62 Grammar.Entry.create level2_ast_grammar "protected_binder_vars" in
63 let level2_meta = Grammar.Entry.create level2_meta_grammar "level2_meta" in
64 { level1_pattern=level1_pattern;
65 level2_ast=level2_ast;
68 protected_binder_vars=protected_binder_vars;
69 level2_meta=level2_meta;
70 level2_ast_grammar=level2_ast_grammar;
74 let grammars = ref (initial_grammars ());;
78 Pervasives.int_of_string s
80 failwith (sprintf "Lexer failure: string_of_int \"%s\" failed" s)
82 (** {2 Grammar extension} *)
84 let level_of precedence =
85 if precedence < min_precedence || precedence > max_precedence then
86 raise (Level_not_found precedence);
87 string_of_int precedence
89 let gram_symbol s = Gramext.Stoken ("SYMBOL", s)
90 let gram_ident s = Gramext.Stoken ("IDENT", s)
91 let gram_number s = Gramext.Stoken ("NUMBER", s)
92 let gram_keyword s = Gramext.Stoken ("", s)
93 let gram_term = function
94 | Ast.Self _ -> Gramext.Sself
95 | Ast.Level precedence ->
97 (Grammar.Entry.obj (!grammars.term: 'a Grammar.Entry.e),
101 let gram_of_literal =
103 | `Symbol s -> gram_symbol s
104 | `Keyword s -> gram_keyword s
105 | `Number s -> gram_number s
109 | Binding of string * Env.value_type
110 | Env of (string * Env.value_type) list
112 let make_action action bindings =
113 let rec aux (vl : CicNotationEnv.t) =
115 [] -> Gramext.action (fun (loc: Ast.location) -> action vl loc)
116 | NoBinding :: tl -> Gramext.action (fun _ -> aux vl tl)
117 (* LUCA: DEFCON 3 BEGIN *)
118 | Binding (name, Env.TermType l) :: tl ->
121 aux ((name, (Env.TermType l, Env.TermValue v))::vl) tl)
122 | Binding (name, Env.StringType) :: tl ->
125 aux ((name, (Env.StringType, Env.StringValue v)) :: vl) tl)
126 | Binding (name, Env.NumType) :: tl ->
129 aux ((name, (Env.NumType, Env.NumValue v)) :: vl) tl)
130 | Binding (name, Env.OptType t) :: tl ->
132 (fun (v:'a option) ->
133 aux ((name, (Env.OptType t, Env.OptValue v)) :: vl) tl)
134 | Binding (name, Env.ListType t) :: tl ->
137 aux ((name, (Env.ListType t, Env.ListValue v)) :: vl) tl)
139 Gramext.action (fun (v:CicNotationEnv.t) -> aux (v @ vl) tl)
140 (* LUCA: DEFCON 3 END *)
142 aux [] (List.rev bindings)
148 | NoBinding :: tl -> aux acc tl
149 | Env names :: tl -> aux (List.rev names @ acc) tl
150 | Binding (name, ty) :: tl -> aux ((name, ty) :: acc) tl
154 (* given a level 1 pattern computes the new RHS of "term" grammar entry *)
155 let extract_term_production pattern =
156 let rec aux = function
157 | Ast.AttributedTerm (_, t) -> aux t
158 | Ast.Literal l -> aux_literal l
159 | Ast.Layout l -> aux_layout l
160 | Ast.Magic m -> aux_magic m
161 | Ast.Variable v -> aux_variable v
163 prerr_endline (CicNotationPp.pp_term t);
167 | `Symbol s -> [NoBinding, gram_symbol s]
169 (* assumption: s will be registered as a keyword with the lexer *)
170 [NoBinding, gram_keyword s]
171 | `Number s -> [NoBinding, gram_number s]
172 and aux_layout = function
173 | Ast.Sub (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\sub"] @ aux p2
174 | Ast.Sup (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\sup"] @ aux p2
175 | Ast.Below (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\below"] @ aux p2
176 | Ast.Above (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\above"] @ aux p2
177 | Ast.Frac (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\frac"] @ aux p2
178 | Ast.InfRule (p1, p2, p3) -> [NoBinding, gram_symbol "\\infrule"] @ aux p1 @ aux p2 @ aux p3
179 | Ast.Atop (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\atop"] @ aux p2
180 | Ast.Over (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\over"] @ aux p2
181 | Ast.Root (p1, p2) ->
182 [NoBinding, gram_symbol "\\root"] @ aux p2
183 @ [NoBinding, gram_symbol "\\of"] @ aux p1
184 | Ast.Sqrt p -> [NoBinding, gram_symbol "\\sqrt"] @ aux p
186 | Ast.Box (_, pl) -> List.flatten (List.map aux pl)
187 | Ast.Group pl -> List.flatten (List.map aux pl)
188 | Ast.Mstyle (_,pl) -> List.flatten (List.map aux pl)
189 | Ast.Mpadded (_,pl) -> List.flatten (List.map aux pl)
190 and aux_magic magic =
193 let p_bindings, p_atoms, p_names, p_action = inner_pattern p in
194 let action (env_opt : CicNotationEnv.t option) (loc : Ast.location) =
196 | Some env -> List.map Env.opt_binding_some env
197 | None -> List.map Env.opt_binding_of_name p_names
199 [ Env (List.map Env.opt_declaration p_names),
201 [ [ Gramext.Sopt (Gramext.srules [ p_atoms, p_action ]) ],
202 Gramext.action action ] ]
204 | Ast.List1 (p, _) ->
205 let p_bindings, p_atoms, p_names, p_action = inner_pattern p in
206 let action (env_list : CicNotationEnv.t list) (loc : Ast.location) =
207 CicNotationEnv.coalesce_env p_names env_list
211 | Ast.List0 (_, None) -> Gramext.Slist0 s
212 | Ast.List1 (_, None) -> Gramext.Slist1 s
213 | Ast.List0 (_, Some l) -> Gramext.Slist0sep (s, gram_of_literal l)
214 | Ast.List1 (_, Some l) -> Gramext.Slist1sep (s, gram_of_literal l)
217 [ Env (List.map Env.list_declaration p_names),
219 [ [ gram_of_list (Gramext.srules [ p_atoms, p_action ]) ],
220 Gramext.action action ] ]
224 | Ast.NumVar s -> [Binding (s, Env.NumType), gram_number ""]
225 | Ast.TermVar (s,(Ast.Self level|Ast.Level level as lv)) ->
226 [Binding (s, Env.TermType level), gram_term lv]
227 | Ast.IdentVar s -> [Binding (s, Env.StringType), gram_ident ""]
228 | Ast.Ascription (p, s) -> assert false (* TODO *)
229 | Ast.FreshVar _ -> assert false
230 and inner_pattern p =
231 let p_bindings, p_atoms = List.split (aux p) in
232 let p_names = flatten_opt p_bindings in
234 make_action (fun (env : CicNotationEnv.t) (loc : Ast.location) -> env)
237 p_bindings, p_atoms, p_names, action
241 type rule_id = Grammar.token Gramext.g_symbol list
243 let compare_rule_id x y =
244 let rec aux = function
248 | ((s1::tl1) as x),((s2::tl2) as y) ->
249 if Gramext.eq_symbol s1 s2 then aux (tl1,tl2)
250 else Pervasives.compare x y
254 (* mapping: rule_id -> owned keywords. (rule_id, string list) Hashtbl.t *)
255 let initial_owned_keywords () = Hashtbl.create 23
256 let owned_keywords = ref (initial_owned_keywords ())
258 type checked_l1_pattern = CL1P of CicNotationPt.term * int
260 let check_l1_pattern level1_pattern level associativity =
261 let variables = ref 0 in
262 let symbols = ref 0 in
263 let rec aux = function
264 | Ast.AttributedTerm (att, t) -> Ast.AttributedTerm (att,aux t)
265 | Ast.Literal _ as l -> incr symbols; l
266 | Ast.Layout l -> Ast.Layout (aux_layout l)
267 | Ast.Magic m -> Ast.Magic (aux_magic m)
268 | Ast.Variable v -> (aux_variable v)
270 and aux_layout = function
271 | Ast.Sub (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Sub (p1, p2)
272 | Ast.Sup (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Sup (p1, p2)
273 | Ast.Below (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Below (p1, p2)
274 | Ast.Above (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Above (p1, p2)
275 | Ast.Frac (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Frac (p1, p2)
276 | Ast.InfRule (p1, p2, p3) -> let p1 = aux p1 in let p2 = aux p2 in let p3 = aux p3 in Ast.InfRule (p1, p2, p3)
277 | Ast.Atop (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Atop (p1, p2)
278 | Ast.Over (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Over (p1, p2)
279 | Ast.Root (p1, p2) -> let p1 = aux p1 in let p2 = aux p2 in Ast.Root (p1, p2)
280 | Ast.Sqrt p -> Ast.Sqrt (aux p)
281 | Ast.Break as t -> t
282 | Ast.Box (b, pl) -> Ast.Box(b, List.map aux pl)
283 | Ast.Group pl -> Ast.Group (List.map aux pl)
284 | Ast.Mstyle (l,pl) -> Ast.Mstyle (l, List.map aux pl)
285 | Ast.Mpadded (l,pl) -> Ast.Mpadded (l, List.map aux pl)
286 and aux_magic magic =
288 | Ast.Opt p -> Ast.Opt (aux p)
289 | Ast.List0 (p, x) -> Ast.List0 (aux p, x)
290 | Ast.List1 (p, x) -> Ast.List1 (aux p, x)
294 | Ast.NumVar _ as t -> Ast.Variable t
295 | Ast.TermVar (s,Ast.Self _) when associativity <> Gramext.NonA ->
297 if !variables > 2 then
298 raise (Parse_error ("Exactly 2 variables must be specified in an "^
299 "associative notation"));
300 (match !variables, associativity with
302 Ast.Variable (Ast.TermVar (s, Ast.Self level))
303 | 1,Gramext.RightA ->
304 Ast.Variable (Ast.TermVar (s, Ast.Self (level+1)))
306 Ast.Variable (Ast.TermVar (s, Ast.Self (level+1)))
307 | 2,Gramext.RightA ->
308 Ast.Variable (Ast.TermVar (s, Ast.Level (level-1)))
310 | Ast.TermVar (s,Ast.Level _) when associativity <> Gramext.NonA ->
311 raise (Parse_error ("Variables can not be declared with a " ^
312 "precedence in an associative notation"))
313 (*avoid camlp5 divergence due to non-Sself recursion at the same level *)
314 | Ast.TermVar (s,Ast.Level l) when l<=level && !variables=0 && !symbols=0->
315 raise(Parse_error("Left recursive rule with precedence not greater " ^
316 "than " ^ string_of_int level ^ " is not allowed to avoid divergence"))
317 | Ast.TermVar _ as t -> incr variables; Ast.Variable t
318 | Ast.IdentVar _ as t -> Ast.Variable t
319 | Ast.Ascription _ -> assert false (* TODO *)
320 | Ast.FreshVar _ -> assert false
322 if associativity <> Gramext.NonA && level = min_precedence then
323 raise (Parse_error ("You can not specify an associative notation " ^
324 "at level "^string_of_int min_precedence ^ "; increase it"));
325 let cp = aux level1_pattern in
326 (* prerr_endline ("checked_pattern: " ^ CicNotationPp.pp_term cp); *)
327 if !variables <> 2 && associativity <> Gramext.NonA then
328 raise (Parse_error ("Exactly 2 variables must be specified in an "^
329 "associative notation"));
333 let extend (CL1P (level1_pattern,precedence)) action =
334 let p_bindings, p_atoms =
335 List.split (extract_term_production level1_pattern)
337 let level = level_of precedence in
340 [ Grammar.Entry.obj (!grammars.term: 'a Grammar.Entry.e),
341 Some (Gramext.Level level),
343 Some (*Gramext.NonA*) Gramext.NonA,
346 (fun (env: CicNotationEnv.t) (loc: Ast.location) ->
350 let keywords = CicNotationUtil.keywords_of_term level1_pattern in
351 let rule_id = p_atoms in
352 List.iter CicNotationLexer.add_level2_ast_keyword keywords;
353 Hashtbl.add !owned_keywords rule_id keywords; (* keywords may be [] *)
357 let atoms = rule_id in
359 let keywords = Hashtbl.find !owned_keywords rule_id in
360 List.iter CicNotationLexer.remove_level2_ast_keyword keywords
361 with Not_found -> assert false);
362 Grammar.delete_rule !grammars.term atoms
366 let parse_level1_pattern_ref = ref (fun _ _ -> assert false)
367 let parse_level2_ast_ref = ref (fun _ -> assert false)
368 let parse_level2_meta_ref = ref (fun _ -> assert false)
370 let fold_cluster binder terms ty body =
372 (fun term body -> Ast.Binder (binder, (term, ty), body))
373 terms body (* terms are names: either Ident or FreshVar *)
375 let fold_exists terms ty body =
378 let lambda = Ast.Binder (`Lambda, (term, ty), body) in
379 Ast.Appl [ Ast.Symbol ("exists", 0); lambda ])
382 let fold_binder binder pt_names body =
384 (fun (names, ty) body -> fold_cluster binder names ty body)
387 let return_term loc term = Ast.AttributedTerm (`Loc loc, term)
388 let return_term_of_level loc term l =
389 Ast.AttributedTerm (`Loc loc, term l)
391 (* create empty precedence level for "term" *)
392 let initialize_grammars () =
394 Gramext.action (fun _ ->
395 failwith "internal error, lexer generated a dummy token")
397 (* Needed since campl4 on "delete_rule" remove the precedence level if it gets
398 * empty after the deletion. The lexer never generate the Stoken below. *)
399 let dummy_prod = [ [ Gramext.Stoken ("DUMMY", "") ], dummy_action ] in
400 let mk_level_list first last =
401 let rec aux acc = function
402 | i when i < first -> acc
405 ((Some (level_of i), Some Gramext.NonA, dummy_prod)
412 [ Grammar.Entry.obj (!grammars.term: 'a Grammar.Entry.e),
414 mk_level_list min_precedence max_precedence ];
415 (* {{{ Grammar for concrete syntax patterns, notation level 1 *)
417 let level1_pattern = !grammars.level1_pattern in
419 GLOBAL: level1_pattern;
422 [ p = l1_pattern; EOI -> fun l -> CicNotationUtil.boxify (p l) ]
425 [ p = LIST1 l1_simple_pattern ->
426 fun l -> List.map (fun x -> x l) p ]
429 [ s = SYMBOL -> `Symbol s
430 | k = QKEYWORD -> `Keyword k
431 | n = NUMBER -> `Number n
434 sep: [ [ "sep"; sep = literal -> sep ] ];
436 [ "list0"; p = l1_simple_pattern; sep = OPT sep ->
437 fun l -> Ast.List0 (p l, sep)
438 | "list1"; p = l1_simple_pattern; sep = OPT sep ->
439 fun l -> Ast.List1 (p l, sep)
440 | "opt"; p = l1_simple_pattern -> fun l -> Ast.Opt (p l)
443 l1_pattern_variable: [
444 [ "term"; precedence = NUMBER; id = IDENT ->
445 Ast.TermVar (id, Ast.Level (int_of_string precedence))
446 | "number"; id = IDENT -> Ast.NumVar id
447 | "ident"; id = IDENT -> Ast.IdentVar id
452 v = [ IDENT | NUMBER | COLOR | FLOATWITHUNIT ] -> id, v]];
455 v = [ PERCENTAGE ] -> id, v]];
458 [ p1 = SELF; SYMBOL "\\sub"; p2 = SELF ->
459 return_term_of_level loc
460 (fun l -> Ast.Layout (Ast.Sub (p1 l, p2 l)))
461 | p1 = SELF; SYMBOL "\\sup"; p2 = SELF ->
462 return_term_of_level loc
463 (fun l -> Ast.Layout (Ast.Sup (p1 l, p2 l)))
464 | p1 = SELF; SYMBOL "\\below"; p2 = SELF ->
465 return_term_of_level loc
466 (fun l -> Ast.Layout (Ast.Below (p1 l, p2 l)))
467 | p1 = SELF; SYMBOL "\\above"; p2 = SELF ->
468 return_term_of_level loc
469 (fun l -> Ast.Layout (Ast.Above (p1 l, p2 l)))
470 | p1 = SELF; SYMBOL "\\over"; p2 = SELF ->
471 return_term_of_level loc
472 (fun l -> Ast.Layout (Ast.Over (p1 l, p2 l)))
473 | p1 = SELF; SYMBOL "\\atop"; p2 = SELF ->
474 return_term_of_level loc
475 (fun l -> Ast.Layout (Ast.Atop (p1 l, p2 l)))
476 | p1 = SELF; SYMBOL "\\frac"; p2 = SELF ->
477 return_term_of_level loc
478 (fun l -> Ast.Layout (Ast.Frac (p1 l, p2 l)))
479 | SYMBOL "\\infrule"; p1 = SELF; p2 = SELF; p3 = SELF ->
480 return_term_of_level loc
481 (fun l -> Ast.Layout (Ast.InfRule (p1 l, p2 l, p3 l)))
482 | SYMBOL "\\sqrt"; p = SELF ->
483 return_term_of_level loc (fun l -> Ast.Layout (Ast.Sqrt p l))
484 | SYMBOL "\\root"; index = SELF; SYMBOL "\\of"; arg = SELF ->
485 return_term_of_level loc
486 (fun l -> Ast.Layout (Ast.Root (arg l, index l)))
487 | "hbox"; LPAREN; p = l1_pattern; RPAREN ->
488 return_term_of_level loc
489 (fun l -> Ast.Layout (Ast.Box ((Ast.H, false, false), p l)))
490 | "vbox"; LPAREN; p = l1_pattern; RPAREN ->
491 return_term_of_level loc
492 (fun l -> Ast.Layout (Ast.Box ((Ast.V, false, false), p l)))
493 | "hvbox"; LPAREN; p = l1_pattern; RPAREN ->
494 return_term_of_level loc
495 (fun l -> Ast.Layout (Ast.Box ((Ast.HV, false, false), p l)))
496 | "hovbox"; LPAREN; p = l1_pattern; RPAREN ->
497 return_term_of_level loc
498 (fun l -> Ast.Layout (Ast.Box ((Ast.HOV, false, false), p l)))
499 | "break" -> return_term_of_level loc (fun _ -> Ast.Layout Ast.Break)
500 | "mstyle"; m = LIST1 mstyle ; LPAREN; t = l1_pattern; RPAREN ->
501 return_term_of_level loc
503 Ast.Layout (Ast.Mstyle (m, t l)))
504 | "mpadded"; m = LIST1 mpadded ; LPAREN; t = l1_pattern; RPAREN ->
505 return_term_of_level loc
507 Ast.Layout (Ast.Mpadded (m, t l)))
508 | LPAREN; p = l1_pattern; RPAREN ->
509 return_term_of_level loc (fun l -> CicNotationUtil.group (p l))
513 return_term_of_level loc
514 (fun l -> Ast.Variable (Ast.TermVar (i,Ast.Self l)))
515 | m = l1_magic_pattern ->
516 return_term_of_level loc (fun l -> Ast.Magic (m l))
517 | v = l1_pattern_variable ->
518 return_term_of_level loc (fun _ -> Ast.Variable v)
519 | l = literal -> return_term_of_level loc (fun _ -> Ast.Literal l)
525 (* {{{ Grammar for ast magics, notation level 2 *)
527 let level2_meta = !grammars.level2_meta in
531 [ "term"; precedence = NUMBER; id = IDENT ->
532 Ast.TermVar (id,Ast.Level (int_of_string precedence))
533 | "number"; id = IDENT -> Ast.NumVar id
534 | "ident"; id = IDENT -> Ast.IdentVar id
535 | "fresh"; id = IDENT -> Ast.FreshVar id
536 | "anonymous" -> Ast.TermVar ("_",Ast.Self 0) (* is the level relevant?*)
537 | id = IDENT -> Ast.TermVar (id,Ast.Self 0)
541 [ "fold"; kind = [ "left" -> `Left | "right" -> `Right ];
542 base = level2_meta; "rec"; id = IDENT; recursive = level2_meta ->
543 Ast.Fold (kind, base, [id], recursive)
544 | "default"; some = level2_meta; none = level2_meta ->
545 Ast.Default (some, none)
546 | "if"; p_test = level2_meta;
547 "then"; p_true = level2_meta;
548 "else"; p_false = level2_meta ->
549 Ast.If (p_test, p_true, p_false)
554 [ magic = l2_magic -> Ast.Magic magic
555 | var = l2_variable -> Ast.Variable var
556 | blob = UNPARSED_AST ->
557 !parse_level2_ast_ref (Ulexing.from_utf8_string blob)
563 (* {{{ Grammar for ast patterns, notation level 2 *)
565 let level2_ast = !grammars.level2_ast in
566 let term = !grammars.term in
567 let let_defs = !grammars.let_defs in
568 let protected_binder_vars = !grammars.protected_binder_vars in
570 GLOBAL: level2_ast term let_defs protected_binder_vars;
571 level2_ast: [ [ p = term -> p ] ];
575 | "Type"; SYMBOL "["; n = NUMBER; SYMBOL "]" -> `NType n
576 | "Type" -> `Type (CicUniv.fresh ())
577 | "CProp" -> `CProp (CicUniv.fresh ())
581 [ SYMBOL "\\subst"; (* to avoid catching frequent "a [1]" cases *)
584 i = IDENT; SYMBOL <:unicode<Assign>> (* ≔ *); t = term -> (i, t)
591 [ s = SYMBOL "_" -> None
592 | p = term -> Some p ]
595 [ SYMBOL "["; substs = LIST0 meta_subst; SYMBOL "]" -> substs ]
597 possibly_typed_name: [
598 [ LPAREN; id = single_arg; SYMBOL ":"; typ = term; RPAREN ->
600 | arg = single_arg -> arg, None
601 | SYMBOL "_" -> Ast.Ident ("_", None), None
602 | LPAREN; SYMBOL "_"; SYMBOL ":"; typ = term; RPAREN ->
603 Ast.Ident ("_", None), Some typ
607 [ id = IDENT -> Ast.Pattern (id, None, [])
608 | LPAREN; id = IDENT; vars = LIST1 possibly_typed_name; RPAREN ->
609 Ast.Pattern (id, None, vars)
610 | id = IDENT; vars = LIST1 possibly_typed_name ->
611 Ast.Pattern (id, None, vars)
612 | SYMBOL "_" -> Ast.Wildcard
616 [ SYMBOL <:unicode<Pi>> (* Π *) -> `Pi
617 | SYMBOL <:unicode<forall>> (* ∀ *) -> `Forall
618 | SYMBOL <:unicode<lambda>> (* λ *) -> `Lambda
622 [ LPAREN; names = LIST1 IDENT SEP SYMBOL ",";
623 SYMBOL ":"; ty = term; RPAREN ->
624 List.map (fun n -> Ast.Ident (n, None)) names, Some ty
625 | name = IDENT -> [Ast.Ident (name, None)], None
626 | blob = UNPARSED_META ->
627 let meta = !parse_level2_meta_ref (Ulexing.from_utf8_string blob) in
629 | Ast.Variable (Ast.FreshVar _) -> [meta], None
630 | Ast.Variable (Ast.TermVar ("_",_)) -> [Ast.Ident ("_", None)], None
631 | _ -> failwith "Invalid bound name."
635 [ name = IDENT -> Ast.Ident (name, None)
636 | blob = UNPARSED_META ->
637 let meta = !parse_level2_meta_ref (Ulexing.from_utf8_string blob) in
639 | Ast.Variable (Ast.FreshVar _)
640 | Ast.Variable (Ast.IdentVar _) -> meta
641 | Ast.Variable (Ast.TermVar ("_",_)) -> Ast.Ident ("_", None)
642 | _ -> failwith "Invalid index name."
649 index_name = OPT [ "on"; id = single_arg -> id ];
650 ty = OPT [ SYMBOL ":" ; p = term -> p ];
651 SYMBOL <:unicode<def>> (* ≝ *); body = term ->
652 let rec position_of name p = function
654 | n :: _ when n = name -> Some p, p
655 | _ :: tl -> position_of name (p + 1) tl
657 let rec find_arg name n = function
659 Ast.fail loc (sprintf "Argument %s not found"
660 (CicNotationPp.pp_term name))
662 (match position_of name 0 l with
663 | None, len -> find_arg name (n + len) tl
664 | Some where, len -> n + where)
667 match index_name with
669 | Some index_name -> find_arg index_name 0 args
674 (function (names,ty) -> List.map (function x -> x,ty) names
677 args, (name, ty), body, index
684 l = LIST1 single_arg SEP SYMBOL "," -> l
685 | SYMBOL "_" -> [Ast.Ident ("_", None)] ];
686 typ = OPT [ SYMBOL ":"; t = term -> t ] -> (vars, typ)
689 protected_binder_vars: [
690 [ LPAREN; vars = binder_vars; RPAREN -> vars
693 maybe_protected_binder_vars: [
694 [ vars = binder_vars -> vars
695 | vars = protected_binder_vars -> vars
700 [ "let"; var = possibly_typed_name; SYMBOL <:unicode<def>> (* ≝ *);
701 p1 = term; "in"; p2 = term ->
702 return_term loc (Ast.LetIn (var, p1, p2))
703 | LETCOREC; defs = let_defs; "in";
705 return_term loc (Ast.LetRec (`CoInductive, defs, body))
706 | LETREC; defs = let_defs; "in";
708 return_term loc (Ast.LetRec (`Inductive, defs, body))
713 [ b = binder; (vars, typ) = maybe_protected_binder_vars; SYMBOL "."; body = term LEVEL "19" ->
714 return_term loc (fold_cluster b vars typ body)
719 [ p1 = term; p2 = term LEVEL "71" ->
720 let rec aux = function
721 | Ast.Appl (hd :: tl)
722 | Ast.AttributedTerm (_, Ast.Appl (hd :: tl)) ->
726 return_term loc (Ast.Appl (aux p1 @ [p2]))
731 [ id = IDENT -> return_term loc (Ast.Ident (id, None))
732 | id = IDENT; s = explicit_subst ->
733 return_term loc (Ast.Ident (id, Some s))
734 | s = CSYMBOL -> return_term loc (Ast.Symbol (s, 0))
735 | u = URI -> return_term loc (Ast.Uri (u, None))
736 | n = NUMBER -> return_term loc (Ast.Num (n, 0))
737 | IMPLICIT -> return_term loc (Ast.Implicit)
738 | PLACEHOLDER -> return_term loc Ast.UserInput
739 | m = META -> return_term loc (Ast.Meta (int_of_string m, []))
740 | m = META; s = meta_substs ->
741 return_term loc (Ast.Meta (int_of_string m, s))
742 | s = sort -> return_term loc (Ast.Sort s)
744 indty_ident = OPT [ "in"; id = IDENT -> id, None ];
745 outtyp = OPT [ "return"; ty = term -> ty ];
748 lhs = match_pattern; SYMBOL <:unicode<Rightarrow>> (* ⇒ *);
753 return_term loc (Ast.Case (t, indty_ident, outtyp, patterns))
754 | LPAREN; p1 = term; SYMBOL ":"; p2 = term; RPAREN ->
755 return_term loc (Ast.Cast (p1, p2))
756 | LPAREN; p = term; RPAREN -> p
757 | blob = UNPARSED_META ->
758 !parse_level2_meta_ref (Ulexing.from_utf8_string blob)
766 let _ = initialize_grammars ();;
768 let history = ref [];;
771 CicNotationLexer.push ();
772 history := (!owned_keywords,!grammars) :: !history;
773 owned_keywords := (initial_owned_keywords ());
774 grammars := initial_grammars ();
775 initialize_grammars ()
779 CicNotationLexer.pop ();
782 | (kw,gram) :: old_history ->
783 owned_keywords := kw;
785 history := old_history
788 (** {2 API implementation} *)
790 let exc_located_wrapper f =
794 | Stdpp.Exc_located (floc, Stream.Error msg) ->
795 raise (HExtlib.Localized (floc, Parse_error msg))
796 | Stdpp.Exc_located (floc, exn) ->
797 raise (HExtlib.Localized (floc, (Parse_error (Printexc.to_string exn))))
799 let parse_level1_pattern precedence lexbuf =
801 (fun () -> Grammar.Entry.parse !grammars.level1_pattern (Obj.magic lexbuf) precedence)
803 let parse_level2_ast lexbuf =
805 (fun () -> Grammar.Entry.parse !grammars.level2_ast (Obj.magic lexbuf))
807 let parse_level2_meta lexbuf =
809 (fun () -> Grammar.Entry.parse !grammars.level2_meta (Obj.magic lexbuf))
812 parse_level1_pattern_ref := parse_level1_pattern;
813 parse_level2_ast_ref := parse_level2_ast;
814 parse_level2_meta_ref := parse_level2_meta
816 let parse_term lexbuf =
818 (fun () -> (Grammar.Entry.parse !grammars.term (Obj.magic lexbuf)))
820 let level2_ast_grammar () = !grammars.level2_ast_grammar
821 let term () = !grammars.term
822 let let_defs () = !grammars.let_defs
823 let protected_binder_vars () = !grammars.protected_binder_vars
828 let print_l2_pattern () =
829 Grammar.print_entry Format.std_formatter (Grammar.Entry.obj !grammars.term);
830 Format.pp_print_flush Format.std_formatter ();
833 (* vim:set encoding=utf8 foldmethod=marker: *)