899 lines
30 KiB
OCaml
899 lines
30 KiB
OCaml
open Camlp4; (* -*- camlp4r -*- *)
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(****************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* INRIA Rocquencourt *)
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(* *)
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(* Copyright 2002-2006 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed under *)
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(* the terms of the GNU Library General Public License, with the special *)
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(* exception on linking described in LICENSE at the top of the OCaml *)
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(* source tree. *)
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(* *)
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(****************************************************************************)
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(* Authors:
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* - Daniel de Rauglaudre: initial version
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* - Nicolas Pouillard: refactoring
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*)
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module Id = struct
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value name = "Camlp4GrammarParser";
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value version = Sys.ocaml_version;
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end;
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module Make (Syntax : Sig.Camlp4Syntax) = struct
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open Sig;
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include Syntax;
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module MetaLoc = Ast.Meta.MetaGhostLoc;
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module MetaAst = Ast.Meta.Make MetaLoc;
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module PP = Camlp4.Printers.OCaml.Make Syntax;
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value pp = new PP.printer ~comments:False ();
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value string_of_patt patt =
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let buf = Buffer.create 42 in
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let () = Format.bprintf buf "%a@?" pp#patt patt in
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let str = Buffer.contents buf in
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if str = "" then assert False else str;
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value split_ext = ref False;
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type loc = Loc.t;
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type name 'e = { expr : 'e; tvar : string; loc : loc };
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type styp =
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[ STlid of loc and string
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| STapp of loc and styp and styp
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| STquo of loc and string
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| STself of loc and string
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| STtok of loc
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| STstring_tok of loc
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| STtyp of Ast.ctyp ]
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;
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type text 'e 'p =
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[ TXmeta of loc and string and list (text 'e 'p) and 'e and styp
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| TXlist of loc and bool and symbol 'e 'p and option (symbol 'e 'p)
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| TXnext of loc
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| TXnterm of loc and name 'e and option string
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| TXopt of loc and text 'e 'p
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| TXtry of loc and text 'e 'p
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| TXrules of loc and list (list (text 'e 'p) * 'e)
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| TXself of loc
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| TXkwd of loc and string
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| TXtok of loc and 'e and string
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(** The first is the match function expr,
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the second is the string description.
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The description string will be used for
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grammar insertion and left factoring.
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Keep this string normalized and well comparable. *) ]
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and entry 'e 'p =
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{ name : name 'e; pos : option 'e; levels : list (level 'e 'p) }
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and level 'e 'p =
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{ label : option string; assoc : option 'e; rules : list (rule 'e 'p) }
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and rule 'e 'p = { prod : list (symbol 'e 'p); action : option 'e }
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and symbol 'e 'p = { used : list string; text : text 'e 'p;
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styp : styp; pattern : option 'p }
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;
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type used = [ Unused | UsedScanned | UsedNotScanned ];
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value _loc = Loc.ghost;
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value gm = "Camlp4Grammar__";
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value mark_used modif ht n =
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try
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let rll = Hashtbl.find_all ht n in
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List.iter
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(fun (r, _) ->
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if r.val == Unused then do {
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r.val := UsedNotScanned; modif.val := True;
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}
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else ())
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rll
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with
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[ Not_found -> () ]
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;
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value rec mark_symbol modif ht symb =
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List.iter (fun e -> mark_used modif ht e) symb.used
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;
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value check_use nl el =
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let ht = Hashtbl.create 301 in
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let modif = ref False in
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do {
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List.iter
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(fun e ->
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let u =
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match e.name.expr with
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[ <:expr< $lid:_$ >> -> Unused
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| _ -> UsedNotScanned ]
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in
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Hashtbl.add ht e.name.tvar (ref u, e))
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el;
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List.iter
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(fun n ->
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try
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let rll = Hashtbl.find_all ht n.tvar in
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List.iter (fun (r, _) -> r.val := UsedNotScanned) rll
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with _ ->
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())
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nl;
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modif.val := True;
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while modif.val do {
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modif.val := False;
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Hashtbl.iter
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(fun _ (r, e) ->
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if r.val = UsedNotScanned then do {
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r.val := UsedScanned;
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List.iter
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(fun level ->
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let rules = level.rules in
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List.iter
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(fun rule ->
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List.iter (fun s -> mark_symbol modif ht s)
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rule.prod)
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rules)
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e.levels
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}
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else ())
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ht
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};
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Hashtbl.iter
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(fun s (r, e) ->
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if r.val = Unused then
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print_warning e.name.loc ("Unused local entry \"" ^ s ^ "\"")
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else ())
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ht;
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}
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;
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value new_type_var =
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let i = ref 0 in fun () -> do { incr i; "e__" ^ string_of_int i.val }
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;
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value used_of_rule_list rl =
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List.fold_left
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(fun nl r -> List.fold_left (fun nl s -> s.used @ nl) nl r.prod) []
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rl
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;
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value retype_rule_list_without_patterns _loc rl =
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try
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List.map
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(fun
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(* ...; [ "foo" ]; ... ==> ...; (x = [ "foo" ] -> Gram.Token.extract_string x); ... *)
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[ {prod = [({pattern = None; styp = STtok _} as s)]; action = None} ->
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{prod = [{ (s) with pattern = Some <:patt< x >> }];
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action = Some <:expr< $uid:gm$.Token.extract_string x >>}
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(* ...; [ symb ]; ... ==> ...; (x = [ symb ] -> x); ... *)
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| {prod = [({pattern = None} as s)]; action = None} ->
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{prod = [{ (s) with pattern = Some <:patt< x >> }];
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action = Some <:expr< x >>}
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(* ...; ([] -> a); ... *)
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| {prod = []; action = Some _} as r -> r
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| _ -> raise Exit ])
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rl
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with
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[ Exit -> rl ]
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;
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value meta_action = ref False;
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value mklistexp _loc =
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loop True where rec loop top =
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fun
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[ [] -> <:expr< [] >>
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| [e1 :: el] ->
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let _loc =
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if top then _loc else Loc.merge (Ast.loc_of_expr e1) _loc
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in
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<:expr< [$e1$ :: $loop False el$] >> ]
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;
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value mklistpat _loc =
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loop True where rec loop top =
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fun
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[ [] -> <:patt< [] >>
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| [p1 :: pl] ->
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let _loc =
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if top then _loc else Loc.merge (Ast.loc_of_patt p1) _loc
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in
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<:patt< [$p1$ :: $loop False pl$] >> ]
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;
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value rec expr_fa al =
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fun
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[ <:expr< $f$ $a$ >> -> expr_fa [a :: al] f
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| f -> (f, al) ]
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;
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value rec make_ctyp styp tvar =
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match styp with
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[ STlid _loc s -> <:ctyp< $lid:s$ >>
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| STapp _loc t1 t2 -> <:ctyp< $make_ctyp t1 tvar$ $make_ctyp t2 tvar$ >>
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| STquo _loc s -> <:ctyp< '$s$ >>
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| STself _loc x ->
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if tvar = "" then
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Loc.raise _loc
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(Stream.Error ("'" ^ x ^ "' illegal in anonymous entry level"))
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else <:ctyp< '$tvar$ >>
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| STtok _loc -> <:ctyp< $uid:gm$.Token.t >>
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| STstring_tok _loc -> <:ctyp< string >>
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| STtyp t -> t ]
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;
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value make_ctyp_patt styp tvar patt =
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let styp = match styp with [ STstring_tok _loc -> STtok _loc | t -> t ] in
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match make_ctyp styp tvar with
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[ <:ctyp< _ >> -> patt
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| t -> let _loc = Ast.loc_of_patt patt in <:patt< ($patt$ : $t$) >> ];
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value make_ctyp_expr styp tvar expr =
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match make_ctyp styp tvar with
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[ <:ctyp< _ >> -> expr
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| t -> let _loc = Ast.loc_of_expr expr in <:expr< ($expr$ : $t$) >> ];
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value text_of_action _loc psl rtvar act tvar =
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let locid = <:patt< $lid:Loc.name.val$ >> in
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let act =
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match act with
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[ Some act -> act
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| None -> <:expr< () >> ]
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in
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let (tok_match_pl, act, _) =
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List.fold_left
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(fun ((tok_match_pl, act, i) as accu) ->
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fun
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[ { pattern = None } -> accu
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| { pattern = Some p } when Ast.is_irrefut_patt p -> accu
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| { pattern = Some <:patt< ($_$ ($tup:<:patt< _ >>$) as $lid:s$) >> } ->
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(tok_match_pl,
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<:expr< let $lid:s$ = $uid:gm$.Token.extract_string $lid:s$
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in $act$ >>, i)
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| { pattern = Some p; text=TXtok _ _ _ } ->
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let id = "__camlp4_"^string_of_int i in
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(Some (match (tok_match_pl) with
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[ None -> (<:expr< $lid:id$ >>, p)
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| Some (tok_pl, match_pl) ->
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(<:expr< $lid:id$, $tok_pl$ >>, <:patt< $p$, $match_pl$ >>)]),
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act, succ i)
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| _ -> accu ])
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(None, act, 0) psl
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in
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let e =
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let e1 = <:expr< ($act$ : '$rtvar$) >> in
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let e2 =
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match (tok_match_pl) with
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[ None -> e1
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| Some (<:expr< $t1$, $t2$ >>, <:patt< $p1$, $p2$ >>) ->
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<:expr< match ($t1$, $t2$) with
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[ ($p1$, $p2$) -> $e1$
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| _ -> assert False ] >>
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| Some (tok, match_) ->
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<:expr< match $tok$ with
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[ $pat:match_$ -> $e1$
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| _ -> assert False ] >> ] in
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<:expr< fun ($locid$ : $uid:gm$.Loc.t) -> $e2$ >> in
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let (txt, _) =
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List.fold_left
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(fun (txt, i) s ->
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match s.pattern with
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[ None | Some <:patt< _ >> -> (<:expr< fun _ -> $txt$ >>, i)
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| Some <:patt< ($_$ ($tup:<:patt< _ >>$) as $p$) >> ->
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let p = make_ctyp_patt s.styp tvar p in
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(<:expr< fun $p$ -> $txt$ >>, i)
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| Some p when Ast.is_irrefut_patt p ->
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let p = make_ctyp_patt s.styp tvar p in
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(<:expr< fun $p$ -> $txt$ >>, i)
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| Some _ ->
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let p = make_ctyp_patt s.styp tvar
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<:patt< $lid:"__camlp4_"^string_of_int i$ >> in
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(<:expr< fun $p$ -> $txt$ >>, succ i) ])
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(e, 0) psl
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in
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let txt =
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if meta_action.val then
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<:expr< Obj.magic $MetaAst.Expr.meta_expr _loc txt$ >>
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else txt
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in
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<:expr< $uid:gm$.Action.mk $txt$ >>
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;
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value srules loc t rl tvar =
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List.map
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(fun r ->
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let sl = [ s.text | s <- r.prod ] in
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let ac = text_of_action loc r.prod t r.action tvar in
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(sl, ac))
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rl
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;
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value rec make_expr entry tvar =
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fun
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[ TXmeta _loc n tl e t ->
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let el =
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List.fold_right
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(fun t el -> <:expr< [$make_expr entry "" t$ :: $el$] >>)
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tl <:expr< [] >>
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in
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<:expr<
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$uid:gm$.Smeta $str:n$ $el$ ($uid:gm$.Action.mk ($make_ctyp_expr t tvar e$)) >>
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| TXlist _loc min t ts ->
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let txt = make_expr entry "" t.text in
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match (min, ts) with
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[ (False, None) -> <:expr< $uid:gm$.Slist0 $txt$ >>
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| (True, None) -> <:expr< $uid:gm$.Slist1 $txt$ >>
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| (False, Some s) ->
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let x = make_expr entry tvar s.text in
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<:expr< $uid:gm$.Slist0sep $txt$ $x$ >>
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| (True, Some s) ->
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let x = make_expr entry tvar s.text in
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<:expr< $uid:gm$.Slist1sep $txt$ $x$ >> ]
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| TXnext _loc -> <:expr< $uid:gm$.Snext >>
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| TXnterm _loc n lev ->
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match lev with
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[ Some lab ->
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<:expr<
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$uid:gm$.Snterml
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($uid:gm$.Entry.obj ($n.expr$ : $uid:gm$.Entry.t '$n.tvar$))
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$str:lab$ >>
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| None ->
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if n.tvar = tvar then <:expr< $uid:gm$.Sself >>
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else
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<:expr<
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$uid:gm$.Snterm
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($uid:gm$.Entry.obj ($n.expr$ : $uid:gm$.Entry.t '$n.tvar$)) >> ]
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| TXopt _loc t -> <:expr< $uid:gm$.Sopt $make_expr entry "" t$ >>
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| TXtry _loc t -> <:expr< $uid:gm$.Stry $make_expr entry "" t$ >>
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| TXrules _loc rl ->
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<:expr< $uid:gm$.srules $entry.expr$ $make_expr_rules _loc entry rl ""$ >>
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| TXself _loc -> <:expr< $uid:gm$.Sself >>
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| TXkwd _loc kwd -> <:expr< $uid:gm$.Skeyword $str:kwd$ >>
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| TXtok _loc match_fun descr ->
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<:expr< $uid:gm$.Stoken ($match_fun$, $`str:descr$) >> ]
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and make_expr_rules _loc n rl tvar =
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List.fold_left
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(fun txt (sl, ac) ->
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let sl =
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List.fold_right
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(fun t txt ->
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let x = make_expr n tvar t in
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<:expr< [$x$ :: $txt$] >>)
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sl <:expr< [] >>
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in
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<:expr< [($sl$, $ac$) :: $txt$] >>)
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<:expr< [] >> rl
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;
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value expr_of_delete_rule _loc n sl =
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let sl =
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List.fold_right
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(fun s e -> <:expr< [$make_expr n "" s.text$ :: $e$] >>) sl
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<:expr< [] >>
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in
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(<:expr< $n.expr$ >>, sl)
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;
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value rec tvar_of_ident =
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fun
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[ <:ident< $lid:x$ >> | <:ident< $uid:x$ >> -> x
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| <:ident< $uid:x$.$xs$ >> -> x ^ "__" ^ tvar_of_ident xs
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| _ -> failwith "internal error in the Grammar extension" ]
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;
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value mk_name _loc i =
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{expr = <:expr< $id:i$ >>; tvar = tvar_of_ident i; loc = _loc};
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value slist loc min sep symb =
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TXlist loc min symb sep
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;
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(*
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value sstoken _loc s =
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let n = mk_name _loc <:ident< $lid:"a_" ^ s$ >> in
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TXnterm _loc n None
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;
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value mk_symbol p s t =
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{used = []; text = s; styp = t; pattern=Some p};
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value sslist _loc min sep s =
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let rl =
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let r1 =
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let prod =
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let n = mk_name _loc <:ident< a_list >> in
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[mk_symbol <:patt< a >> (TXnterm _loc n None) (STquo _loc "a_list")]
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in
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let act = <:expr< a >> in
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{prod = prod; action = Some act}
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in
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let r2 =
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let prod =
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[mk_symbol <:patt< a >> (slist _loc min sep s)
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(STapp _loc (STlid _loc "list") s.styp)]
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in
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let act = <:expr< Qast.List a >> in
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{prod = prod; action = Some act}
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in
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[r1; r2]
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in
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let used =
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match sep with
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[ Some symb -> symb.used @ s.used
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| None -> s.used ]
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in
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let used = ["a_list" :: used] in
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let text = TXrules _loc (srules _loc "a_list" rl "") in
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let styp = STquo _loc "a_list" in
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{used = used; text = text; styp = styp; pattern = None}
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;
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|
|
value ssopt _loc s =
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let rl =
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let r1 =
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let prod =
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let n = mk_name _loc <:ident< a_opt >> in
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[mk_symbol <:patt< a >> (TXnterm _loc n None) (STquo _loc "a_opt")]
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in
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let act = <:expr< a >> in
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{prod = prod; action = Some act}
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in
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let r2 =
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let s =
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match s.text with
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[ TXkwd _loc _ | TXtok _loc _ _ ->
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let rl =
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[{prod = [{ (s) with pattern = Some <:patt< x >> }];
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action = Some <:expr< Qast.Str (Token.extract_string x) >>}]
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in
|
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let t = new_type_var () in
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{used = []; text = TXrules _loc (srules _loc t rl "");
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styp = STquo _loc t; pattern = None}
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| _ -> s ]
|
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in
|
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let prod =
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[mk_symbol <:patt< a >> (TXopt _loc s.text)
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(STapp _loc (STlid _loc "option") s.styp)]
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in
|
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let act = <:expr< Qast.Option a >> in
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{prod = prod; action = Some act}
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in
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[r1; r2]
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in
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let used = ["a_opt" :: s.used] in
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let text = TXrules _loc (srules _loc "a_opt" rl "") in
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let styp = STquo _loc "a_opt" in
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{used = used; text = text; styp = styp; pattern = None}
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|
;
|
|
*)
|
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|
|
value text_of_entry _loc e =
|
|
let ent =
|
|
let x = e.name in
|
|
let _loc = e.name.loc in
|
|
<:expr< ($x.expr$ : $uid:gm$.Entry.t '$x.tvar$) >>
|
|
in
|
|
let pos =
|
|
match e.pos with
|
|
[ Some pos -> <:expr< Some $pos$ >>
|
|
| None -> <:expr< None >> ]
|
|
in
|
|
let txt =
|
|
List.fold_right
|
|
(fun level txt ->
|
|
let lab =
|
|
match level.label with
|
|
[ Some lab -> <:expr< Some $str:lab$ >>
|
|
| None -> <:expr< None >> ]
|
|
in
|
|
let ass =
|
|
match level.assoc with
|
|
[ Some ass -> <:expr< Some $ass$ >>
|
|
| None -> <:expr< None >> ]
|
|
in
|
|
let txt =
|
|
let rl = srules _loc e.name.tvar level.rules e.name.tvar in
|
|
let e = make_expr_rules _loc e.name rl e.name.tvar in
|
|
<:expr< [($lab$, $ass$, $e$) :: $txt$] >>
|
|
in
|
|
txt)
|
|
e.levels <:expr< [] >>
|
|
in
|
|
(ent, pos, txt)
|
|
;
|
|
|
|
value let_in_of_extend _loc gram gl el args =
|
|
match gl with
|
|
[ None -> args
|
|
| Some nl ->
|
|
do {
|
|
check_use nl el;
|
|
let ll =
|
|
let same_tvar e n = e.name.tvar = n.tvar in
|
|
List.fold_right
|
|
(fun e ll ->
|
|
match e.name.expr with
|
|
[ <:expr< $lid:_$ >> ->
|
|
if List.exists (same_tvar e) nl then ll
|
|
else if List.exists (same_tvar e) ll then ll
|
|
else [e.name :: ll]
|
|
| _ -> ll ])
|
|
el []
|
|
in
|
|
let local_binding_of_name {expr = e; tvar = x; loc = _loc} =
|
|
let i =
|
|
match e with
|
|
[ <:expr< $lid:i$ >> -> i
|
|
| _ -> failwith "internal error in the Grammar extension" ]
|
|
in <:binding< $lid:i$ =
|
|
(grammar_entry_create $str:i$ : $uid:gm$.Entry.t '$x$) >> in
|
|
let expr_of_name {expr = e; tvar = x; loc = _loc} =
|
|
<:expr< ($e$ : $uid:gm$.Entry.t '$x$) >> in
|
|
let e =
|
|
match ll with
|
|
[ [] -> args
|
|
| [x::xs] ->
|
|
let locals =
|
|
List.fold_right
|
|
(fun name acc ->
|
|
<:binding< $acc$ and $local_binding_of_name name$ >>)
|
|
xs (local_binding_of_name x)
|
|
in
|
|
let entry_mk =
|
|
match gram with
|
|
[ Some g -> <:expr< $uid:gm$.Entry.mk $id:g$ >>
|
|
| None -> <:expr< $uid:gm$.Entry.mk >> ]
|
|
in <:expr<
|
|
let grammar_entry_create = $entry_mk$ in
|
|
let $locals$ in $args$ >> ]
|
|
in
|
|
match nl with
|
|
[ [] -> e
|
|
| [x::xs] ->
|
|
let globals =
|
|
List.fold_right
|
|
(fun name acc ->
|
|
<:binding< $acc$ and _ = $expr_of_name name$ >>)
|
|
xs <:binding< _ = $expr_of_name x$ >>
|
|
in <:expr< let $globals$ in $e$ >> ]
|
|
} ]
|
|
;
|
|
|
|
class subst gmod =
|
|
object
|
|
inherit Ast.map as super;
|
|
method ident =
|
|
fun
|
|
[ <:ident< $uid:x$ >> when x = gm -> gmod
|
|
| x -> super#ident x ];
|
|
end;
|
|
|
|
value subst_gmod ast gmod = (new subst gmod)#expr ast;
|
|
|
|
value text_of_functorial_extend _loc gmod gram gl el =
|
|
let args =
|
|
let el =
|
|
List.map
|
|
(fun e ->
|
|
let (ent, pos, txt) = text_of_entry e.name.loc e in
|
|
let e = <:expr< $uid:gm$.extend $ent$ ((fun () -> ($pos$, $txt$)) ()) >> in
|
|
if split_ext.val then <:expr< let aux () = $e$ in aux () >> else e)
|
|
el
|
|
in
|
|
match el with
|
|
[ [] -> <:expr< () >>
|
|
| [e] -> e
|
|
| [e::el] ->
|
|
<:expr< do { $List.fold_left
|
|
(fun acc x -> <:expr< $acc$; $x$ >>) e el$ } >> ]
|
|
in
|
|
subst_gmod (let_in_of_extend _loc gram gl el args) gmod;
|
|
|
|
value wildcarder = object (self)
|
|
inherit Ast.map as super;
|
|
method patt =
|
|
fun
|
|
[ <:patt@_loc< $lid:_$ >> -> <:patt< _ >>
|
|
| <:patt< ($p$ as $_$) >> -> self#patt p
|
|
| p -> super#patt p ];
|
|
end;
|
|
|
|
value mk_tok _loc p t =
|
|
let p' = wildcarder#patt p in
|
|
let match_fun =
|
|
if Ast.is_irrefut_patt p' then
|
|
<:expr< fun [ $pat:p'$ -> True ] >>
|
|
else
|
|
<:expr< fun [ $pat:p'$ -> True | _ -> False ] >> in
|
|
let descr = string_of_patt p' in
|
|
let text = TXtok _loc match_fun descr in
|
|
{used = []; text = text; styp = t; pattern = Some p };
|
|
|
|
value symbol = Gram.Entry.mk "symbol";
|
|
|
|
value check_not_tok s =
|
|
match s with
|
|
[ {text = TXtok _loc _ _ } ->
|
|
Loc.raise _loc (Stream.Error
|
|
("Deprecated syntax, use a sub rule. "^
|
|
"LIST0 STRING becomes LIST0 [ x = STRING -> x ]"))
|
|
| _ -> () ];
|
|
|
|
Camlp4_config.antiquotations.val := True;
|
|
|
|
EXTEND Gram
|
|
GLOBAL: expr symbol;
|
|
expr: AFTER "top"
|
|
[ [ "EXTEND"; e = extend_body; "END" -> e
|
|
| "DELETE_RULE"; e = delete_rule_body; "END" -> e
|
|
| "GDELETE_RULE" ->
|
|
Loc.raise _loc (Stream.Error
|
|
"Deprecated syntax, use DELETE_RULE MyGramModule ... END instead")
|
|
| "GEXTEND" ->
|
|
Loc.raise _loc (Stream.Error
|
|
"Deprecated syntax, use EXTEND MyGramModule ... END instead") ] ]
|
|
;
|
|
extend_header:
|
|
[ [ "("; i = qualid; ":"; t = t_qualid; ")" -> (Some i, t)
|
|
| g = qualuid -> (None, g) ] ]
|
|
;
|
|
extend_body:
|
|
[ [ (gram, g) = extend_header; global_list = OPT global;
|
|
el = LIST1 [ e = entry; semi_sep -> e ] ->
|
|
text_of_functorial_extend _loc g gram global_list el ] ]
|
|
;
|
|
delete_rule_body:
|
|
[ [ g = qualuid; n = name; ":"; sl = LIST0 symbol SEP semi_sep ->
|
|
let (e, b) = expr_of_delete_rule _loc n sl in
|
|
subst_gmod <:expr< $uid:gm$.delete_rule $e$ $b$ >> g ] ]
|
|
;
|
|
qualuid:
|
|
[ [ [ LIDENT | UIDENT "GLOBAL" ] ->
|
|
Loc.raise _loc
|
|
(Stream.Error
|
|
"Deprecated syntax, the grammar module is expected") ]
|
|
| [ x = UIDENT; "."; xs = SELF -> <:ident< $uid:x$.$xs$ >>
|
|
| i = UIDENT -> <:ident< $uid:i$ >> ] ]
|
|
;
|
|
qualuid:
|
|
[ [ [ LIDENT | UIDENT "GLOBAL" ] ->
|
|
Loc.raise _loc
|
|
(Stream.Error
|
|
"Deprecated syntax, the grammar module is expected") ]
|
|
| [ x = UIDENT; "."; xs = SELF -> <:ident< $uid:x$.$xs$ >>
|
|
| i = UIDENT -> <:ident< $uid:i$ >> ] ]
|
|
;
|
|
qualid:
|
|
[ [ x = UIDENT; "."; xs = SELF -> <:ident< $uid:x$.$xs$ >>
|
|
| i = UIDENT -> <:ident< $uid:i$ >>
|
|
| i = LIDENT -> <:ident< $lid:i$ >>
|
|
] ]
|
|
;
|
|
t_qualid:
|
|
[ [ x = UIDENT; "."; xs = SELF -> <:ident< $uid:x$.$xs$ >>
|
|
| x = UIDENT; "."; `LIDENT "t" -> <:ident< $uid:x$ >>
|
|
| `(LIDENT _ | UIDENT _) ->
|
|
Loc.raise _loc (Stream.Error
|
|
("Wrong EXTEND header, the grammar type must finish by 't', "^
|
|
"like in EXTEND (g : Gram.t) ... END")) ] ]
|
|
;
|
|
global:
|
|
[ [ UIDENT "GLOBAL"; ":"; sl = LIST1 name; semi_sep -> sl ] ]
|
|
;
|
|
entry:
|
|
[ [ n = name; ":"; pos = OPT position; ll = level_list ->
|
|
{name = n; pos = pos; levels = ll} ] ]
|
|
;
|
|
position:
|
|
[ [ UIDENT "FIRST" -> <:expr< Camlp4.Sig.Grammar.First >>
|
|
| UIDENT "LAST" -> <:expr< Camlp4.Sig.Grammar.Last >>
|
|
| UIDENT "BEFORE"; n = string -> <:expr< Camlp4.Sig.Grammar.Before $n$ >>
|
|
| UIDENT "AFTER"; n = string -> <:expr< Camlp4.Sig.Grammar.After $n$ >>
|
|
| UIDENT "LEVEL"; n = string -> <:expr< Camlp4.Sig.Grammar.Level $n$ >> ] ]
|
|
;
|
|
level_list:
|
|
[ [ "["; ll = LIST0 level SEP "|"; "]" -> ll ] ]
|
|
;
|
|
level:
|
|
[ [ lab = OPT [ x = STRING -> x ]; ass = OPT assoc; rules = rule_list ->
|
|
{label = lab; assoc = ass; rules = rules} ] ]
|
|
;
|
|
assoc:
|
|
[ [ UIDENT "LEFTA" -> <:expr< Camlp4.Sig.Grammar.LeftA >>
|
|
| UIDENT "RIGHTA" -> <:expr< Camlp4.Sig.Grammar.RightA >>
|
|
| UIDENT "NONA" -> <:expr< Camlp4.Sig.Grammar.NonA >> ] ]
|
|
;
|
|
rule_list:
|
|
[ [ "["; "]" -> []
|
|
| "["; rules = LIST1 rule SEP "|"; "]" ->
|
|
retype_rule_list_without_patterns _loc rules ] ]
|
|
;
|
|
rule:
|
|
[ [ psl = LIST0 psymbol SEP semi_sep; "->"; act = expr ->
|
|
{prod = psl; action = Some act}
|
|
| psl = LIST0 psymbol SEP semi_sep ->
|
|
{prod = psl; action = None} ] ]
|
|
;
|
|
psymbol:
|
|
[ [ p = LIDENT; "="; s = symbol ->
|
|
match s.pattern with
|
|
[ Some (<:patt< $uid:u$ ($tup:<:patt< _ >>$) >> as p') ->
|
|
let match_fun = <:expr< fun [ $pat:p'$ -> True | _ -> False ] >> in
|
|
let p' = <:patt< ($p'$ as $lid:p$) >> in
|
|
let descr = u ^ " _" in
|
|
let text = TXtok _loc match_fun descr in
|
|
{ (s) with text = text; pattern = Some p' }
|
|
| _ -> { (s) with pattern = Some <:patt< $lid:p$ >> } ]
|
|
| i = LIDENT; lev = OPT [ UIDENT "LEVEL"; s = STRING -> s ] ->
|
|
let name = mk_name _loc <:ident< $lid:i$ >> in
|
|
let text = TXnterm _loc name lev in
|
|
let styp = STquo _loc i in
|
|
{used = [i]; text = text; styp = styp; pattern = None}
|
|
| p = pattern; "="; s = symbol ->
|
|
match s.pattern with
|
|
[ Some <:patt< $uid:u$ ($tup:<:patt< _ >>$) >> ->
|
|
mk_tok _loc <:patt< $uid:u$ $p$ >> s.styp
|
|
| _ -> { (s) with pattern = Some p } ]
|
|
| s = symbol -> s ] ]
|
|
;
|
|
symbol:
|
|
[ "top" NONA
|
|
[ UIDENT "LIST0"; s = SELF;
|
|
sep = OPT [ UIDENT "SEP"; t = symbol -> t ] ->
|
|
let () = check_not_tok s in
|
|
let used =
|
|
match sep with
|
|
[ Some symb -> symb.used @ s.used
|
|
| None -> s.used ]
|
|
in
|
|
let styp = STapp _loc (STlid _loc "list") s.styp in
|
|
let text = slist _loc False sep s in
|
|
{used = used; text = text; styp = styp; pattern = None}
|
|
| UIDENT "LIST1"; s = SELF;
|
|
sep = OPT [ UIDENT "SEP"; t = symbol -> t ] ->
|
|
let () = check_not_tok s in
|
|
let used =
|
|
match sep with
|
|
[ Some symb -> symb.used @ s.used
|
|
| None -> s.used ]
|
|
in
|
|
let styp = STapp _loc (STlid _loc "list") s.styp in
|
|
let text = slist _loc True sep s in
|
|
{used = used; text = text; styp = styp; pattern = None}
|
|
| UIDENT "OPT"; s = SELF ->
|
|
let () = check_not_tok s in
|
|
let styp = STapp _loc (STlid _loc "option") s.styp in
|
|
let text = TXopt _loc s.text in
|
|
{used = s.used; text = text; styp = styp; pattern = None}
|
|
| UIDENT "TRY"; s = SELF ->
|
|
let text = TXtry _loc s.text in
|
|
{used = s.used; text = text; styp = s.styp; pattern = None} ]
|
|
| [ UIDENT "SELF" ->
|
|
{used = []; text = TXself _loc; styp = STself _loc "SELF"; pattern = None}
|
|
| UIDENT "NEXT" ->
|
|
{used = []; text = TXnext _loc; styp = STself _loc "NEXT"; pattern = None}
|
|
| "["; rl = LIST0 rule SEP "|"; "]" ->
|
|
let rl = retype_rule_list_without_patterns _loc rl in
|
|
let t = new_type_var () in
|
|
{used = used_of_rule_list rl;
|
|
text = TXrules _loc (srules _loc t rl "");
|
|
styp = STquo _loc t; pattern = None}
|
|
| "`"; p = patt -> mk_tok _loc p (STtok _loc)
|
|
| x = UIDENT -> mk_tok _loc <:patt< $uid:x$ ($tup:<:patt< _ >>$) >>
|
|
(STstring_tok _loc)
|
|
| x = UIDENT; s = STRING -> mk_tok _loc <:patt< $uid:x$ $str:s$ >> (STtok _loc)
|
|
| x = UIDENT; `ANTIQUOT "" s ->
|
|
let e = AntiquotSyntax.parse_expr _loc s in
|
|
let match_fun = <:expr< fun [ $uid:x$ camlp4_x when camlp4_x = $e$ -> True | _ -> False ] >> in
|
|
let descr = "$" ^ x ^ " " ^ s in
|
|
let text = TXtok _loc match_fun descr in
|
|
let p = <:patt< $uid:x$ ($tup:<:patt< _ >>$) >> in
|
|
{used = []; text = text; styp = STtok _loc; pattern = Some p }
|
|
| s = STRING ->
|
|
{used = []; text = TXkwd _loc s;
|
|
styp = STtok _loc; pattern = None }
|
|
| i = UIDENT; "."; il = qualid;
|
|
lev = OPT [ UIDENT "LEVEL"; s = STRING -> s ] ->
|
|
let n = mk_name _loc <:ident< $uid:i$.$il$ >> in
|
|
{used = [n.tvar]; text = TXnterm _loc n lev;
|
|
styp = STquo _loc n.tvar; pattern = None}
|
|
| n = name; lev = OPT [ UIDENT "LEVEL"; s = STRING -> s ] ->
|
|
{used = [n.tvar]; text = TXnterm _loc n lev;
|
|
styp = STquo _loc n.tvar; pattern = None}
|
|
| "("; s_t = SELF; ")" -> s_t ] ]
|
|
;
|
|
pattern:
|
|
[ [ i = LIDENT -> <:patt< $lid:i$ >>
|
|
| "_" -> <:patt< _ >>
|
|
| "("; p = pattern; ")" -> <:patt< $p$ >>
|
|
| "("; p1 = pattern; ","; p2 = comma_patt; ")" -> <:patt< ( $p1$, $p2$ ) >>
|
|
] ]
|
|
;
|
|
comma_patt:
|
|
[ [ p1 = SELF; ","; p2 = SELF -> <:patt< $p1$, $p2$ >>
|
|
| p = pattern -> p
|
|
] ]
|
|
;
|
|
name:
|
|
[ [ il = qualid -> mk_name _loc il ] ]
|
|
;
|
|
string:
|
|
[ [ s = STRING -> <:expr< $str:s$ >>
|
|
| `ANTIQUOT "" s -> AntiquotSyntax.parse_expr _loc s ] ]
|
|
;
|
|
semi_sep:
|
|
[ [ ";" -> () ] ]
|
|
;
|
|
END;
|
|
|
|
|
|
(*
|
|
EXTEND Gram
|
|
symbol: LEVEL "top"
|
|
[ NONA
|
|
[ min = [ UIDENT "SLIST0" -> False | UIDENT "SLIST1" -> True ];
|
|
s = SELF; sep = OPT [ UIDENT "SEP"; t = symbol -> t ] ->
|
|
sslist _loc min sep s
|
|
| UIDENT "SOPT"; s = SELF ->
|
|
ssopt _loc s ] ]
|
|
;
|
|
END;
|
|
*)
|
|
|
|
value sfold _loc n foldfun f e s =
|
|
let styp = STquo _loc (new_type_var ()) in
|
|
let e = <:expr< $uid:gm$.$lid:foldfun$ $f$ $e$ >> in
|
|
let t = STapp _loc (STapp _loc (STtyp <:ctyp< $uid:gm$.fold _ >>) s.styp) styp in
|
|
{used = s.used; text = TXmeta _loc n [s.text] e t; styp = styp; pattern = None }
|
|
;
|
|
|
|
value sfoldsep _loc n foldfun f e s sep =
|
|
let styp = STquo _loc (new_type_var ()) in
|
|
let e = <:expr< $uid:gm$.$lid:foldfun$ $f$ $e$ >> in
|
|
let t =
|
|
STapp _loc (STapp _loc (STtyp <:ctyp< $uid:gm$.foldsep _ >>) s.styp) styp
|
|
in
|
|
{used = s.used @ sep.used; text = TXmeta _loc n [s.text; sep.text] e t;
|
|
styp = styp; pattern = None}
|
|
;
|
|
|
|
EXTEND Gram
|
|
GLOBAL: symbol;
|
|
symbol: LEVEL "top"
|
|
[ [ UIDENT "FOLD0"; f = simple_expr; e = simple_expr; s = SELF ->
|
|
sfold _loc "FOLD0" "sfold0" f e s
|
|
| UIDENT "FOLD1"; f = simple_expr; e = simple_expr; s = SELF ->
|
|
sfold _loc "FOLD1" "sfold1" f e s
|
|
| UIDENT "FOLD0"; f = simple_expr; e = simple_expr; s = SELF;
|
|
UIDENT "SEP"; sep = symbol ->
|
|
sfoldsep _loc "FOLD0 SEP" "sfold0sep" f e s sep
|
|
| UIDENT "FOLD1"; f = simple_expr; e = simple_expr; s = SELF;
|
|
UIDENT "SEP"; sep = symbol ->
|
|
sfoldsep _loc "FOLD1 SEP" "sfold1sep" f e s sep ] ]
|
|
;
|
|
simple_expr:
|
|
[ [ i = a_LIDENT -> <:expr< $lid:i$ >>
|
|
| "("; e = expr; ")" -> e ] ]
|
|
;
|
|
END;
|
|
|
|
Options.add "-split_ext" (Arg.Set split_ext)
|
|
"Split EXTEND by functions to turn around a PowerPC problem.";
|
|
|
|
Options.add "-split_gext" (Arg.Set split_ext)
|
|
"Old name for the option -split_ext.";
|
|
|
|
Options.add "-meta_action" (Arg.Set meta_action)
|
|
"Undocumented"; (* FIXME *)
|
|
|
|
end;
|
|
|
|
module M = Register.OCamlSyntaxExtension Id Make;
|