47 lines
1.5 KiB
OCaml
47 lines
1.5 KiB
OCaml
(* camlp4r pa_extend.cmo q_MLast.cmo *)
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(***********************************************************************)
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(* *)
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(* Camlp4 *)
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(* *)
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(* Daniel de Rauglaudre, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1998 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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open Pcaml;
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value o2b =
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fun
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[ Some _ -> True
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| None -> False ]
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;
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EXTEND
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GLOBAL: expr;
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expr: LEVEL "top"
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[ [ "do"; "{"; seq = sequence; "}" ->
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match seq with
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[ [e] -> e
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| _ -> <:expr< do { $list:seq$ } >> ] ] ]
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;
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sequence:
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[ [ "let"; o = OPT "rec"; l = LIST1 let_binding SEP "and"; [ "in" | ";" ];
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el = SELF ->
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let e =
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match el with
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[ [e] -> e
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| _ -> <:expr< do { $list:el$ } >> ]
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in
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[ <:expr< let $opt:o2b o$ $list:l$ in $e$ >> ]
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| e = expr; ";"; el = SELF ->
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let e = let _loc = MLast.loc_of_expr e in <:expr< ($e$ : unit) >> in
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[e :: el]
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| e = expr; ";" -> [e]
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| e = expr -> [e] ] ]
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;
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END;
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