X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=components%2Fcontent_pres%2FcicNotationParser.ml;fp=components%2Fcontent_pres%2FcicNotationParser.ml;h=461e2fc9f755e9b0f868188ac4b535accd4b996d;hp=0000000000000000000000000000000000000000;hb=f61af501fb4608cc4fb062a0864c774e677f0d76;hpb=58ae1809c352e71e7b5530dc41e2bfc834e1aef1 diff --git a/components/content_pres/cicNotationParser.ml b/components/content_pres/cicNotationParser.ml new file mode 100644 index 000000000..461e2fc9f --- /dev/null +++ b/components/content_pres/cicNotationParser.ml @@ -0,0 +1,661 @@ +(* Copyright (C) 2005, HELM Team. + * + * This file is part of HELM, an Hypertextual, Electronic + * Library of Mathematics, developed at the Computer Science + * Department, University of Bologna, Italy. + * + * HELM is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * HELM is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with HELM; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, + * MA 02111-1307, USA. + * + * For details, see the HELM World-Wide-Web page, + * http://helm.cs.unibo.it/ + *) + +(* $Id$ *) + +open Printf + +module Ast = CicNotationPt +module Env = CicNotationEnv + +exception Parse_error of string +exception Level_not_found of int + +let level1_pattern_grammar = + Grammar.gcreate CicNotationLexer.level1_pattern_lexer +let level2_ast_grammar = Grammar.gcreate CicNotationLexer.level2_ast_lexer +let level2_meta_grammar = Grammar.gcreate CicNotationLexer.level2_meta_lexer + +let min_precedence = 0 +let max_precedence = 100 + +let level1_pattern = + Grammar.Entry.create level1_pattern_grammar "level1_pattern" +let level2_ast = Grammar.Entry.create level2_ast_grammar "level2_ast" +let term = Grammar.Entry.create level2_ast_grammar "term" +let let_defs = Grammar.Entry.create level2_ast_grammar "let_defs" +let protected_binder_vars = Grammar.Entry.create level2_ast_grammar "protected_binder_vars" +let level2_meta = Grammar.Entry.create level2_meta_grammar "level2_meta" + +let int_of_string s = + try + Pervasives.int_of_string s + with Failure _ -> + failwith (sprintf "Lexer failure: string_of_int \"%s\" failed" s) + +(** {2 Grammar extension} *) + +let gram_symbol s = Gramext.Stoken ("SYMBOL", s) +let gram_ident s = Gramext.Stoken ("IDENT", s) +let gram_number s = Gramext.Stoken ("NUMBER", s) +let gram_keyword s = Gramext.Stoken ("", s) +let gram_term = Gramext.Sself + +let gram_of_literal = + function + | `Symbol s -> gram_symbol s + | `Keyword s -> gram_keyword s + | `Number s -> gram_number s + +type binding = + | NoBinding + | Binding of string * Env.value_type + | Env of (string * Env.value_type) list + +let make_action action bindings = + let rec aux (vl : CicNotationEnv.t) = + function + [] -> Gramext.action (fun (loc: Ast.location) -> action vl loc) + | NoBinding :: tl -> Gramext.action (fun _ -> aux vl tl) + (* LUCA: DEFCON 3 BEGIN *) + | Binding (name, Env.TermType) :: tl -> + Gramext.action + (fun (v:Ast.term) -> + aux ((name, (Env.TermType, Env.TermValue v))::vl) tl) + | Binding (name, Env.StringType) :: tl -> + Gramext.action + (fun (v:string) -> + aux ((name, (Env.StringType, Env.StringValue v)) :: vl) tl) + | Binding (name, Env.NumType) :: tl -> + Gramext.action + (fun (v:string) -> + aux ((name, (Env.NumType, Env.NumValue v)) :: vl) tl) + | Binding (name, Env.OptType t) :: tl -> + Gramext.action + (fun (v:'a option) -> + aux ((name, (Env.OptType t, Env.OptValue v)) :: vl) tl) + | Binding (name, Env.ListType t) :: tl -> + Gramext.action + (fun (v:'a list) -> + aux ((name, (Env.ListType t, Env.ListValue v)) :: vl) tl) + | Env _ :: tl -> + Gramext.action (fun (v:CicNotationEnv.t) -> aux (v @ vl) tl) + (* LUCA: DEFCON 3 END *) + in + aux [] (List.rev bindings) + +let flatten_opt = + let rec aux acc = + function + [] -> List.rev acc + | NoBinding :: tl -> aux acc tl + | Env names :: tl -> aux (List.rev names @ acc) tl + | Binding (name, ty) :: tl -> aux ((name, ty) :: acc) tl + in + aux [] + + (* given a level 1 pattern computes the new RHS of "term" grammar entry *) +let extract_term_production pattern = + let rec aux = function + | Ast.AttributedTerm (_, t) -> aux t + | Ast.Literal l -> aux_literal l + | Ast.Layout l -> aux_layout l + | Ast.Magic m -> aux_magic m + | Ast.Variable v -> aux_variable v + | t -> + prerr_endline (CicNotationPp.pp_term t); + assert false + and aux_literal = + function + | `Symbol s -> [NoBinding, gram_symbol s] + | `Keyword s -> + (* assumption: s will be registered as a keyword with the lexer *) + [NoBinding, gram_keyword s] + | `Number s -> [NoBinding, gram_number s] + and aux_layout = function + | Ast.Sub (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\sub"] @ aux p2 + | Ast.Sup (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\sup"] @ aux p2 + | Ast.Below (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\below"] @ aux p2 + | Ast.Above (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\above"] @ aux p2 + | Ast.Frac (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\frac"] @ aux p2 + | Ast.Atop (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\atop"] @ aux p2 + | Ast.Over (p1, p2) -> aux p1 @ [NoBinding, gram_symbol "\\over"] @ aux p2 + | Ast.Root (p1, p2) -> + [NoBinding, gram_symbol "\\root"] @ aux p2 + @ [NoBinding, gram_symbol "\\of"] @ aux p1 + | Ast.Sqrt p -> [NoBinding, gram_symbol "\\sqrt"] @ aux p + | Ast.Break -> [] + | Ast.Box (_, pl) -> List.flatten (List.map aux pl) + | Ast.Group pl -> List.flatten (List.map aux pl) + and aux_magic magic = + match magic with + | Ast.Opt p -> + let p_bindings, p_atoms, p_names, p_action = inner_pattern p in + let action (env_opt : CicNotationEnv.t option) (loc : Ast.location) = + match env_opt with + | Some env -> List.map Env.opt_binding_some env + | None -> List.map Env.opt_binding_of_name p_names + in + [ Env (List.map Env.opt_declaration p_names), + Gramext.srules + [ [ Gramext.Sopt (Gramext.srules [ p_atoms, p_action ]) ], + Gramext.action action ] ] + | Ast.List0 (p, _) + | Ast.List1 (p, _) -> + let p_bindings, p_atoms, p_names, p_action = inner_pattern p in +(* let env0 = List.map list_binding_of_name p_names in + let grow_env_entry env n v = + List.map + (function + | (n', (ty, ListValue vl)) as entry -> + if n' = n then n', (ty, ListValue (v :: vl)) else entry + | _ -> assert false) + env + in + let grow_env env_i env = + List.fold_left + (fun env (n, (_, v)) -> grow_env_entry env n v) + env env_i + in *) + let action (env_list : CicNotationEnv.t list) (loc : Ast.location) = + CicNotationEnv.coalesce_env p_names env_list + in + let gram_of_list s = + match magic with + | Ast.List0 (_, None) -> Gramext.Slist0 s + | Ast.List1 (_, None) -> Gramext.Slist1 s + | Ast.List0 (_, Some l) -> Gramext.Slist0sep (s, gram_of_literal l) + | Ast.List1 (_, Some l) -> Gramext.Slist1sep (s, gram_of_literal l) + | _ -> assert false + in + [ Env (List.map Env.list_declaration p_names), + Gramext.srules + [ [ gram_of_list (Gramext.srules [ p_atoms, p_action ]) ], + Gramext.action action ] ] + | _ -> assert false + and aux_variable = + function + | Ast.NumVar s -> [Binding (s, Env.NumType), gram_number ""] + | Ast.TermVar s -> [Binding (s, Env.TermType), gram_term] + | Ast.IdentVar s -> [Binding (s, Env.StringType), gram_ident ""] + | Ast.Ascription (p, s) -> assert false (* TODO *) + | Ast.FreshVar _ -> assert false + and inner_pattern p = + let p_bindings, p_atoms = List.split (aux p) in + let p_names = flatten_opt p_bindings in + let action = + make_action (fun (env : CicNotationEnv.t) (loc : Ast.location) -> env) + p_bindings + in + p_bindings, p_atoms, p_names, action + in + aux pattern + +let level_of precedence associativity = + if precedence < min_precedence || precedence > max_precedence then + raise (Level_not_found precedence); + let assoc_string = + match associativity with + | Gramext.NonA -> "N" + | Gramext.LeftA -> "L" + | Gramext.RightA -> "R" + in + string_of_int precedence ^ assoc_string + +type rule_id = Grammar.token Gramext.g_symbol list + + (* mapping: rule_id -> owned keywords. (rule_id, string list) Hashtbl.t *) +let owned_keywords = Hashtbl.create 23 + +let extend level1_pattern ~precedence ~associativity action = + let p_bindings, p_atoms = + List.split (extract_term_production level1_pattern) + in + let level = level_of precedence associativity in +(* let p_names = flatten_opt p_bindings in *) + let _ = + Grammar.extend + [ Grammar.Entry.obj (term: 'a Grammar.Entry.e), + Some (Gramext.Level level), + [ None, + Some associativity, + [ p_atoms, + (make_action + (fun (env: CicNotationEnv.t) (loc: Ast.location) -> + (action env loc)) + p_bindings) ]]] + in + let keywords = CicNotationUtil.keywords_of_term level1_pattern in + let rule_id = p_atoms in + List.iter CicNotationLexer.add_level2_ast_keyword keywords; + Hashtbl.add owned_keywords rule_id keywords; (* keywords may be [] *) + rule_id + +let delete rule_id = + let atoms = rule_id in + (try + let keywords = Hashtbl.find owned_keywords rule_id in + List.iter CicNotationLexer.remove_level2_ast_keyword keywords + with Not_found -> assert false); + Grammar.delete_rule term atoms + +(** {2 Grammar} *) + +let parse_level1_pattern_ref = ref (fun _ -> assert false) +let parse_level2_ast_ref = ref (fun _ -> assert false) +let parse_level2_meta_ref = ref (fun _ -> assert false) + +let fold_cluster binder terms ty body = + List.fold_right + (fun term body -> Ast.Binder (binder, (term, ty), body)) + terms body (* terms are names: either Ident or FreshVar *) + +let fold_exists terms ty body = + List.fold_right + (fun term body -> + let lambda = Ast.Binder (`Lambda, (term, ty), body) in + Ast.Appl [ Ast.Symbol ("exists", 0); lambda ]) + terms body + +let fold_binder binder pt_names body = + List.fold_right + (fun (names, ty) body -> fold_cluster binder names ty body) + pt_names body + +let return_term loc term = Ast.AttributedTerm (`Loc loc, term) + + (* create empty precedence level for "term" *) +let _ = + let dummy_action = + Gramext.action (fun _ -> + failwith "internal error, lexer generated a dummy token") + in + (* Needed since campl4 on "delete_rule" remove the precedence level if it gets + * empty after the deletion. The lexer never generate the Stoken below. *) + let dummy_prod = [ [ Gramext.Stoken ("DUMMY", "") ], dummy_action ] in + let mk_level_list first last = + let rec aux acc = function + | i when i < first -> acc + | i -> + aux + ((Some (string_of_int i ^ "N"), Some Gramext.NonA, dummy_prod) + :: (Some (string_of_int i ^ "L"), Some Gramext.LeftA, dummy_prod) + :: (Some (string_of_int i ^ "R"), Some Gramext.RightA, dummy_prod) + :: acc) + (i - 1) + in + aux [] last + in + Grammar.extend + [ Grammar.Entry.obj (term: 'a Grammar.Entry.e), + None, + mk_level_list min_precedence max_precedence ] + +(* {{{ Grammar for concrete syntax patterns, notation level 1 *) +EXTEND + GLOBAL: level1_pattern; + + level1_pattern: [ [ p = l1_pattern; EOI -> CicNotationUtil.boxify p ] ]; + l1_pattern: [ [ p = LIST1 l1_simple_pattern -> p ] ]; + literal: [ + [ s = SYMBOL -> `Symbol s + | k = QKEYWORD -> `Keyword k + | n = NUMBER -> `Number n + ] + ]; + sep: [ [ "sep"; sep = literal -> sep ] ]; +(* row_sep: [ [ "rowsep"; sep = literal -> sep ] ]; + field_sep: [ [ "fieldsep"; sep = literal -> sep ] ]; *) + l1_magic_pattern: [ + [ "list0"; p = l1_simple_pattern; sep = OPT sep -> Ast.List0 (p, sep) + | "list1"; p = l1_simple_pattern; sep = OPT sep -> Ast.List1 (p, sep) + | "opt"; p = l1_simple_pattern -> Ast.Opt p + ] + ]; + l1_pattern_variable: [ + [ "term"; id = IDENT -> Ast.TermVar id + | "number"; id = IDENT -> Ast.NumVar id + | "ident"; id = IDENT -> Ast.IdentVar id + ] + ]; + l1_simple_pattern: + [ "layout" LEFTA + [ p1 = SELF; SYMBOL "\\sub"; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Sub (p1, p2))) + | p1 = SELF; SYMBOL "\\sup"; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Sup (p1, p2))) + | p1 = SELF; SYMBOL "\\below"; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Below (p1, p2))) + | p1 = SELF; SYMBOL "\\above"; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Above (p1, p2))) + | p1 = SELF; SYMBOL "\\over"; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Over (p1, p2))) + | p1 = SELF; SYMBOL "\\atop"; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Atop (p1, p2))) +(* | "array"; p = SELF; csep = OPT field_sep; rsep = OPT row_sep -> + return_term loc (Array (p, csep, rsep)) *) + | SYMBOL "\\frac"; p1 = SELF; p2 = SELF -> + return_term loc (Ast.Layout (Ast.Frac (p1, p2))) + | SYMBOL "\\sqrt"; p = SELF -> return_term loc (Ast.Layout (Ast.Sqrt p)) + | SYMBOL "\\root"; index = SELF; SYMBOL "\\of"; arg = SELF -> + return_term loc (Ast.Layout (Ast.Root (arg, index))) + | "hbox"; LPAREN; p = l1_pattern; RPAREN -> + return_term loc (Ast.Layout (Ast.Box ((Ast.H, false, false), p))) + | "vbox"; LPAREN; p = l1_pattern; RPAREN -> + return_term loc (Ast.Layout (Ast.Box ((Ast.V, false, false), p))) + | "hvbox"; LPAREN; p = l1_pattern; RPAREN -> + return_term loc (Ast.Layout (Ast.Box ((Ast.HV, false, false), p))) + | "hovbox"; LPAREN; p = l1_pattern; RPAREN -> + return_term loc (Ast.Layout (Ast.Box ((Ast.HOV, false, false), p))) + | "break" -> return_term loc (Ast.Layout Ast.Break) +(* | SYMBOL "\\SPACE" -> return_term loc (Layout Space) *) + | LPAREN; p = l1_pattern; RPAREN -> + return_term loc (CicNotationUtil.group p) + ] + | "simple" NONA + [ i = IDENT -> return_term loc (Ast.Variable (Ast.TermVar i)) + | m = l1_magic_pattern -> return_term loc (Ast.Magic m) + | v = l1_pattern_variable -> return_term loc (Ast.Variable v) + | l = literal -> return_term loc (Ast.Literal l) + ] + ]; + END +(* }}} *) + +(* {{{ Grammar for ast magics, notation level 2 *) +EXTEND + GLOBAL: level2_meta; + l2_variable: [ + [ "term"; id = IDENT -> Ast.TermVar id + | "number"; id = IDENT -> Ast.NumVar id + | "ident"; id = IDENT -> Ast.IdentVar id + | "fresh"; id = IDENT -> Ast.FreshVar id + | "anonymous" -> Ast.TermVar "_" + | id = IDENT -> Ast.TermVar id + ] + ]; + l2_magic: [ + [ "fold"; kind = [ "left" -> `Left | "right" -> `Right ]; + base = level2_meta; "rec"; id = IDENT; recursive = level2_meta -> + Ast.Fold (kind, base, [id], recursive) + | "default"; some = level2_meta; none = level2_meta -> + Ast.Default (some, none) + | "if"; p_test = level2_meta; + "then"; p_true = level2_meta; + "else"; p_false = level2_meta -> + Ast.If (p_test, p_true, p_false) + | "fail" -> Ast.Fail + ] + ]; + level2_meta: [ + [ magic = l2_magic -> Ast.Magic magic + | var = l2_variable -> Ast.Variable var + | blob = UNPARSED_AST -> + !parse_level2_ast_ref (Ulexing.from_utf8_string blob) + ] + ]; +END +(* }}} *) + +(* {{{ Grammar for ast patterns, notation level 2 *) +EXTEND + GLOBAL: level2_ast term let_defs protected_binder_vars; + level2_ast: [ [ p = term -> p ] ]; + sort: [ + [ "Prop" -> `Prop + | "Set" -> `Set + | "Type" -> `Type (CicUniv.fresh ()) + | "CProp" -> `CProp + ] + ]; + explicit_subst: [ + [ SYMBOL "\\subst"; (* to avoid catching frequent "a [1]" cases *) + SYMBOL "["; + substs = LIST1 [ + i = IDENT; SYMBOL <:unicode> (* ≔ *); t = term -> (i, t) + ] SEP SYMBOL ";"; + SYMBOL "]" -> + substs + ] + ]; + meta_subst: [ + [ s = SYMBOL "_" -> None + | p = term -> Some p ] + ]; + meta_substs: [ + [ SYMBOL "["; substs = LIST0 meta_subst; SYMBOL "]" -> substs ] + ]; + possibly_typed_name: [ + [ LPAREN; id = single_arg; SYMBOL ":"; typ = term; RPAREN -> + id, Some typ + | arg = single_arg -> arg, None + | SYMBOL "_" -> Ast.Ident ("_", None), None + | LPAREN; SYMBOL "_"; SYMBOL ":"; typ = term; RPAREN -> + Ast.Ident ("_", None), Some typ + ] + ]; + match_pattern: [ + [ id = IDENT -> Ast.Pattern (id, None, []) + | LPAREN; id = IDENT; vars = LIST1 possibly_typed_name; RPAREN -> + Ast.Pattern (id, None, vars) + | id = IDENT; vars = LIST1 possibly_typed_name -> + Ast.Pattern (id, None, vars) + | SYMBOL "_" -> Ast.Wildcard + ] + ]; + binder: [ + [ SYMBOL <:unicode> (* Π *) -> `Pi +(* | SYMBOL <:unicode> |+ ∃ +| -> `Exists *) + | SYMBOL <:unicode> (* ∀ *) -> `Forall + | SYMBOL <:unicode> (* λ *) -> `Lambda + ] + ]; + arg: [ + [ LPAREN; names = LIST1 IDENT SEP SYMBOL ","; + SYMBOL ":"; ty = term; RPAREN -> + List.map (fun n -> Ast.Ident (n, None)) names, Some ty + | name = IDENT -> [Ast.Ident (name, None)], None + | blob = UNPARSED_META -> + let meta = !parse_level2_meta_ref (Ulexing.from_utf8_string blob) in + match meta with + | Ast.Variable (Ast.FreshVar _) -> [meta], None + | Ast.Variable (Ast.TermVar "_") -> [Ast.Ident ("_", None)], None + | _ -> failwith "Invalid bound name." + ] + ]; + single_arg: [ + [ name = IDENT -> Ast.Ident (name, None) + | blob = UNPARSED_META -> + let meta = !parse_level2_meta_ref (Ulexing.from_utf8_string blob) in + match meta with + | Ast.Variable (Ast.FreshVar _) + | Ast.Variable (Ast.IdentVar _) -> meta + | Ast.Variable (Ast.TermVar "_") -> Ast.Ident ("_", None) + | _ -> failwith "Invalid index name." + ] + ]; + induction_kind: [ + [ "rec" -> `Inductive + | "corec" -> `CoInductive + ] + ]; + let_defs: [ + [ defs = LIST1 [ + name = single_arg; + args = LIST1 arg; + index_name = OPT [ "on"; id = single_arg -> id ]; + ty = OPT [ SYMBOL ":" ; p = term -> p ]; + SYMBOL <:unicode> (* ≝ *); body = term -> + let rec position_of name p = function + | [] -> None, p + | n :: _ when n = name -> Some p, p + | _ :: tl -> position_of name (p + 1) tl + in + let rec find_arg name n = function + | [] -> + Ast.fail loc (sprintf "Argument %s not found" + (CicNotationPp.pp_term name)) + | (l,_) :: tl -> + (match position_of name 0 l with + | None, len -> find_arg name (n + len) tl + | Some where, len -> n + where) + in + let index = + match index_name with + | None -> 0 + | Some index_name -> find_arg index_name 0 args + in + let args = + List.concat + (List.map + (function (names,ty) -> List.map (function x -> x,ty) names + ) args) + in + args, (name, ty), body, index + ] SEP "and" -> + defs + ] + ]; + binder_vars: [ + [ vars = [ + l = LIST1 single_arg SEP SYMBOL "," -> l + | SYMBOL "_" -> [Ast.Ident ("_", None)] ]; + typ = OPT [ SYMBOL ":"; t = term -> t ] -> (vars, typ) + ] + ]; + protected_binder_vars: [ + [ LPAREN; vars = binder_vars; RPAREN -> vars + ] + ]; + maybe_protected_binder_vars: [ + [ vars = binder_vars -> vars + | vars = protected_binder_vars -> vars + ] + ]; + term: LEVEL "10N" [ (* let in *) + [ "let"; var = possibly_typed_name; SYMBOL <:unicode> (* ≝ *); + p1 = term; "in"; p2 = term -> + return_term loc (Ast.LetIn (var, p1, p2)) + | "let"; k = induction_kind; defs = let_defs; "in"; + body = term -> + return_term loc (Ast.LetRec (k, defs, body)) + ] + ]; + term: LEVEL "20R" (* binder *) + [ + [ b = binder; (vars, typ) = maybe_protected_binder_vars; SYMBOL "."; body = term -> + return_term loc (fold_cluster b vars typ body) + | SYMBOL <:unicode> (* ∃ *); + (vars, typ) = maybe_protected_binder_vars; SYMBOL "."; body = term -> + return_term loc (fold_exists vars typ body) + ] + ]; + term: LEVEL "70L" (* apply *) + [ + [ p1 = term; p2 = term -> + let rec aux = function + | Ast.Appl (hd :: tl) + | Ast.AttributedTerm (_, Ast.Appl (hd :: tl)) -> + aux hd @ tl + | term -> [term] + in + return_term loc (Ast.Appl (aux p1 @ [p2])) + ] + ]; + term: LEVEL "90N" (* simple *) + [ + [ id = IDENT -> return_term loc (Ast.Ident (id, None)) + | id = IDENT; s = explicit_subst -> + return_term loc (Ast.Ident (id, Some s)) + | s = CSYMBOL -> return_term loc (Ast.Symbol (s, 0)) + | u = URI -> return_term loc (Ast.Uri (u, None)) + | n = NUMBER -> return_term loc (Ast.Num (n, 0)) + | IMPLICIT -> return_term loc (Ast.Implicit) + | PLACEHOLDER -> return_term loc Ast.UserInput + | m = META -> return_term loc (Ast.Meta (int_of_string m, [])) + | m = META; s = meta_substs -> + return_term loc (Ast.Meta (int_of_string m, s)) + | s = sort -> return_term loc (Ast.Sort s) + | "match"; t = term; + indty_ident = OPT [ "in"; id = IDENT -> id, None ]; + outtyp = OPT [ "return"; ty = term -> ty ]; + "with"; SYMBOL "["; + patterns = LIST0 [ + lhs = match_pattern; SYMBOL <:unicode> (* ⇒ *); + rhs = term -> + lhs, rhs + ] SEP SYMBOL "|"; + SYMBOL "]" -> + return_term loc (Ast.Case (t, indty_ident, outtyp, patterns)) + | LPAREN; p1 = term; SYMBOL ":"; p2 = term; RPAREN -> + return_term loc (Ast.Cast (p1, p2)) + | LPAREN; p = term; RPAREN -> p + | blob = UNPARSED_META -> + !parse_level2_meta_ref (Ulexing.from_utf8_string blob) + ] + ]; +END +(* }}} *) + +(** {2 API implementation} *) + +let exc_located_wrapper f = + try + f () + with + | Stdpp.Exc_located (floc, Stream.Error msg) -> + raise (HExtlib.Localized (floc, Parse_error msg)) + | Stdpp.Exc_located (floc, exn) -> + raise (HExtlib.Localized (floc, (Parse_error (Printexc.to_string exn)))) + +let parse_level1_pattern lexbuf = + exc_located_wrapper + (fun () -> Grammar.Entry.parse level1_pattern (Obj.magic lexbuf)) + +let parse_level2_ast lexbuf = + exc_located_wrapper + (fun () -> Grammar.Entry.parse level2_ast (Obj.magic lexbuf)) + +let parse_level2_meta lexbuf = + exc_located_wrapper + (fun () -> Grammar.Entry.parse level2_meta (Obj.magic lexbuf)) + +let _ = + parse_level1_pattern_ref := parse_level1_pattern; + parse_level2_ast_ref := parse_level2_ast; + parse_level2_meta_ref := parse_level2_meta + +let parse_term lexbuf = + exc_located_wrapper + (fun () -> (Grammar.Entry.parse term (Obj.magic lexbuf))) + +(** {2 Debugging} *) + +let print_l2_pattern () = + Grammar.print_entry Format.std_formatter (Grammar.Entry.obj term); + Format.pp_print_flush Format.std_formatter (); + flush stdout + +(* vim:set encoding=utf8 foldmethod=marker: *)