92 lines
3.2 KiB
OCaml
92 lines
3.2 KiB
OCaml
(* camlp4r pa_extend.cmo q_MLast.cmo *)
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(* $Id$ *)
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(* This module is deprecated since version 3.07; use pa_macro.ml instead *)
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value _ =
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prerr_endline "Warning: pa_ifdef is deprecated since OCaml 3.07. Use pa_macro instead."
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;
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type item_or_def 'a =
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[ SdStr of 'a | SdDef of string | SdUnd of string | SdNop ]
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;
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value list_remove x l =
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List.fold_right (fun e l -> if e = x then l else [e :: l]) l []
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;
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value defined = ref ["OCAML_308"; "OCAML_307"; "OCAML_305"; "CAMLP4_300"; "NEWSEQ"];
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value define x = defined.val := [x :: defined.val];
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value undef x = defined.val := list_remove x defined.val;
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EXTEND
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GLOBAL: Pcaml.expr Pcaml.str_item Pcaml.sig_item;
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Pcaml.expr: LEVEL "top"
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[ [ "ifdef"; c = UIDENT; "then"; e1 = Pcaml.expr; "else";
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e2 = Pcaml.expr ->
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if List.mem c defined.val then e1 else e2
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| "ifndef"; c = UIDENT; "then"; e1 = Pcaml.expr; "else";
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e2 = Pcaml.expr ->
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if List.mem c defined.val then e2 else e1 ] ]
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;
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Pcaml.str_item: FIRST
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[ [ x = def_undef_str ->
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match x with
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[ SdStr si -> si
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| SdDef x -> do { define x; <:str_item< declare end >> }
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| SdUnd x -> do { undef x; <:str_item< declare end >> }
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| SdNop -> <:str_item< declare end >> ] ] ]
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;
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def_undef_str:
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[ [ "ifdef"; c = UIDENT; "then"; e1 = str_item_def_undef;
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"else"; e2 = str_item_def_undef ->
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if List.mem c defined.val then e1 else e2
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| "ifdef"; c = UIDENT; "then"; e1 = str_item_def_undef ->
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if List.mem c defined.val then e1 else SdNop
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| "ifndef"; c = UIDENT; "then"; e1 = str_item_def_undef;
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"else"; e2 = str_item_def_undef ->
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if List.mem c defined.val then e2 else e1
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| "ifndef"; c = UIDENT; "then"; e1 = str_item_def_undef ->
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if List.mem c defined.val then SdNop else e1
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| "define"; c = UIDENT -> SdDef c
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| "undef"; c = UIDENT -> SdUnd c ] ]
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;
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str_item_def_undef:
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[ [ d = def_undef_str -> d
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| si = Pcaml.str_item -> SdStr si ] ]
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;
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Pcaml.sig_item: FIRST
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[ [ x = def_undef_sig ->
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match x with
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[ SdStr si -> si
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| SdDef x -> do { define x; <:sig_item< declare end >> }
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| SdUnd x -> do { undef x; <:sig_item< declare end >> }
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| SdNop -> <:sig_item< declare end >> ] ] ]
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;
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def_undef_sig:
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[ [ "ifdef"; c = UIDENT; "then"; e1 = sig_item_def_undef;
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"else"; e2 = sig_item_def_undef ->
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if List.mem c defined.val then e1 else e2
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| "ifdef"; c = UIDENT; "then"; e1 = sig_item_def_undef ->
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if List.mem c defined.val then e1 else SdNop
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| "ifndef"; c = UIDENT; "then"; e1 = sig_item_def_undef;
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"else"; e2 = sig_item_def_undef ->
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if List.mem c defined.val then e2 else e1
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| "ifndef"; c = UIDENT; "then"; e1 = sig_item_def_undef ->
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if List.mem c defined.val then SdNop else e1
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| "define"; c = UIDENT -> SdDef c
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| "undef"; c = UIDENT -> SdUnd c ] ]
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;
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sig_item_def_undef:
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[ [ d = def_undef_sig -> d
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| si = Pcaml.sig_item -> SdStr si ] ]
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;
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END;
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Pcaml.add_option "-D" (Arg.String define)
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"<string> Define for ifdef instruction."
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;
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Pcaml.add_option "-U" (Arg.String undef)
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"<string> Undefine for ifdef instruction."
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;
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