53 lines
2.2 KiB
OCaml
53 lines
2.2 KiB
OCaml
(****************************************************************************)
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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 2007 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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open Camlp4.PreCast;
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module CamlSyntax = Camlp4OCamlParser.Make (Camlp4OCamlRevisedParser.Make Syntax);
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value expr_of_string = CamlSyntax.Gram.parse_string CamlSyntax.expr_eoi;
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module LambdaGram = MakeGram Lexer;
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value term = LambdaGram.Entry.mk "term";
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value term_eoi = LambdaGram.Entry.mk "lambda term quotation";
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Camlp4_config.antiquotations.val := True;
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EXTEND LambdaGram
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GLOBAL: term term_eoi;
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term:
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[ "top"
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[ "fun"; v = var; "->"; t = term -> <:expr< `Lam $v$ $t$ >> ]
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| "app"
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[ t1 = SELF; t2 = SELF -> <:expr< `App $t1$ $t2$ >> ]
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| "simple"
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[ `ANTIQUOT (""|"term") a -> expr_of_string _loc a
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| v = var -> <:expr< `Var $v$ >>
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| "("; t = term; ")" -> t ]
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];
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var:
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[[ v = LIDENT -> <:expr< $str:v$ >>
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| `ANTIQUOT (""|"var") a -> expr_of_string _loc a
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]];
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term_eoi:
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[[ t = term; `EOI -> t ]];
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END;
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value expand_lambda_quot_expr loc _loc_name_opt quotation_contents =
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LambdaGram.parse_string term_eoi loc quotation_contents;
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Syntax.Quotation.add "lam" Syntax.Quotation.DynAst.expr_tag expand_lambda_quot_expr;
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Syntax.Quotation.default.val := "lam";
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