--- /dev/null
+(* 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<Assign>> (* ≔ *); 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<Pi>> (* Π *) -> `Pi
+(* | SYMBOL <:unicode<exists>> |+ ∃ +| -> `Exists *)
+ | SYMBOL <:unicode<forall>> (* ∀ *) -> `Forall
+ | SYMBOL <:unicode<lambda>> (* 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<def>> (* ≝ *); 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<def>> (* ≝ *);
+ 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<exists>> (* ∃ *);
+ (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<Rightarrow>> (* ⇒ *);
+ 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: *)
projects / helm.git / blobdiff