diff options
Diffstat (limited to 'lib/compat.ml4')
| -rw-r--r-- | lib/compat.ml4 | 222 |
1 files changed, 212 insertions, 10 deletions
diff --git a/lib/compat.ml4 b/lib/compat.ml4 index c37758152..aba272045 100644 --- a/lib/compat.ml4 +++ b/lib/compat.ml4 @@ -8,19 +8,221 @@ (** Compatibility file depending on ocaml/camlp4 version *) +(** Locations *) + +IFDEF CAMLP5 THEN + +module Loc = struct + include Ploc + exception Exc_located = Exc + let ghost = dummy + let merge = encl +end + +let make_loc = Loc.make_unlined +let unloc loc = (Loc.first_pos loc, Loc.last_pos loc) + +ELSE + +module Loc = Camlp4.PreCast.Loc + +let make_loc (start,stop) = + Loc.of_tuple ("", 0, 0, start, 0, 0, stop, false) +let unloc loc = (Loc.start_off loc, Loc.stop_off loc) + +END + +(** Misc module emulation *) + IFDEF CAMLP5 THEN -type loc = Stdpp.location -let dummy_loc = Stdpp.dummy_loc -let make_loc = Stdpp.make_loc -let unloc loc = Stdpp.first_pos loc, Stdpp.last_pos loc -let join_loc loc1 loc2 = - if loc1 = dummy_loc or loc2 = dummy_loc then dummy_loc - else Stdpp.encl_loc loc1 loc2 -type lexer = Tok.t Token.glexer +module PcamlSig = struct end + +ELSE + +module PcamlSig = Camlp4.Sig +module Ast = Camlp4.PreCast.Ast +module Pcaml = Camlp4.PreCast.Syntax +module MLast = Ast +module Token = struct exception Error of string end + +END + -ELSE (* official camlp4 of ocaml >= 3.10 *) +(** Grammar auxiliary types *) + +IFDEF CAMLP5 THEN +type gram_assoc = Gramext.g_assoc = NonA | RightA | LeftA +type gram_position = Gramext.position = + | First + | Last + | Before of string + | After of string + | Like of string (** dont use it, not in camlp4 *) + | Level of string +ELSE +type gram_assoc = PcamlSig.Grammar.assoc = NonA | RightA | LeftA +type gram_position = PcamlSig.Grammar.position = + | First + | Last + | Before of string + | After of string + | Level of string +END + + +(** Signature of Lexer *) + +IFDEF CAMLP5 THEN + +module type LexerSig = sig + include Grammar.GLexerType with type te = Tok.t + module Error : sig + type t + exception E of t + end +end + +ELSE + +module type LexerSig = + Camlp4.Sig.Lexer with module Loc = Loc and type Token.t = Tok.t + +END + +(** Signature and implementation of grammars *) + +IFDEF CAMLP5 THEN -TODO +module type GrammarSig = sig + include Grammar.S with type te = Tok.t + type 'a entry = 'a Entry.e + type internal_entry = Tok.t Gramext.g_entry + type symbol = Tok.t Gramext.g_symbol + type action = Gramext.g_action + type production_rule = symbol list * action + type single_extend_statment = + string option * gram_assoc option * production_rule list + type extend_statment = + gram_position option * single_extend_statment list + val action : 'a -> action + val entry_create : string -> 'a entry + val entry_parse : 'a entry -> parsable -> 'a + val entry_print : 'a entry -> unit + val srules' : production_rule list -> symbol + val parse_tokens_after_filter : 'a entry -> Tok.t Stream.t -> 'a +end +module GrammarMake (L:LexerSig) : GrammarSig = struct + include Grammar.GMake (L) + type 'a entry = 'a Entry.e + type internal_entry = Tok.t Gramext.g_entry + type symbol = Tok.t Gramext.g_symbol + type action = Gramext.g_action + type production_rule = symbol list * action + type single_extend_statment = + string option * gram_assoc option * production_rule list + type extend_statment = + gram_position option * single_extend_statment list + let action = Gramext.action + let entry_create = Entry.create + let entry_parse = Entry.parse + let entry_print = Entry.print + let srules' = Gramext.srules + let parse_tokens_after_filter = Entry.parse_token +end + +ELSE + +module type GrammarSig = sig + include Camlp4.Sig.Grammar.Static + with module Loc = Loc and type Token.t = Tok.t + type 'a entry = 'a Entry.t + type action = Action.t + type parsable + val parsable : char Stream.t -> parsable + val action : 'a -> action + val entry_create : string -> 'a entry + val entry_parse : 'a entry -> parsable -> 'a + val entry_print : 'a entry -> unit + val srules' : production_rule list -> symbol +end + +module GrammarMake (L:LexerSig) : GrammarSig = struct + include Camlp4.Struct.Grammar.Static.Make (L) + type 'a entry = 'a Entry.t + type action = Action.t + type parsable = char Stream.t + let parsable s = s + let action = Action.mk + let entry_create = Entry.mk + let entry_parse e s = parse e (*FIXME*)Loc.ghost s + let entry_print x = Entry.print Format.std_formatter x + let srules' = srules (entry_create "dummy") +end + +END + + +(** Misc functional adjustments *) + +(** - The lexer produces streams made of pairs in camlp4 *) + +let get_tok = IFDEF CAMLP5 THEN fun x -> x ELSE fst END + +(** - Gram.extend is more currified in camlp5 than in camlp4 *) + +IFDEF CAMLP5 THEN +let maybe_curry f x y = f (x,y) +let maybe_uncurry f (x,y) = f x y +ELSE +let maybe_curry f = f +let maybe_uncurry f = f +END + + +(** Fix a quotation difference in [str_item] *) + +let declare_str_items loc l = + let l' = <:str_item< open Pcoq >> :: <:str_item< open Extrawit >> :: l in +IFDEF CAMLP5 THEN + MLast.StDcl (loc,l') (* correspond to <:str_item< declare $list:l'$ end >> *) +ELSE + Ast.stSem_of_list l' +END + +(** Quotation difference for match clauses *) + +let default_patt loc = + (<:patt< _ >>, None, <:expr< failwith "Extension: cannot occur" >>) + +IFDEF CAMLP5 THEN + +let make_fun loc cl = + let l = cl @ [default_patt loc] in + MLast.ExFun (loc,l) (* correspond to <:expr< fun [ $list:l$ ] >> *) + +ELSE + +let make_fun loc cl = + let mk_when = function + | Some w -> w + | None -> Ast.ExNil loc + in + let mk_clause (patt,optwhen,expr) = + (* correspond to <:match_case< ... when ... -> ... >> *) + Ast.McArr (loc, patt, mk_when optwhen, expr) in + let init = mk_clause (default_patt loc) in + let add_clause x acc = Ast.McOr (loc, mk_clause x, acc) in + let l = List.fold_right add_clause cl init in + Ast.ExFun (loc,l) (* correspond to <:expr< fun [ $l$ ] >> *) + +END + +(** Explicit antiquotation $anti:... $ *) + +IFDEF CAMLP5 THEN +let expl_anti loc e = <:expr< $anti:e$ >> +ELSE +let expl_anti _loc e = e (* FIXME: understand someday if we can do better *) END |