Move parser combinators shared by property and model parsing to separate file

1 files changed, 102 insertions, 0 deletions

diff --git a/src/parser_combinators.ml b/src/parser_combinators.ml
new file mode 100644
index 00000000..97ad1827
--- /dev/null
+++ b/src/parser_combinators.ml
@@ -0,0 +1,102 @@
+(**************************************************************************)
+(*     Sail                                                               *)
+(*                                                                        *)
+(*  Copyright (c) 2013-2017                                               *)
+(*    Kathyrn Gray                                                        *)
+(*    Shaked Flur                                                         *)
+(*    Stephen Kell                                                        *)
+(*    Gabriel Kerneis                                                     *)
+(*    Robert Norton-Wright                                                *)
+(*    Christopher Pulte                                                   *)
+(*    Peter Sewell                                                        *)
+(*    Alasdair Armstrong                                                  *)
+(*    Brian Campbell                                                      *)
+(*    Thomas Bauereiss                                                    *)
+(*    Anthony Fox                                                         *)
+(*    Jon French                                                          *)
+(*    Dominic Mulligan                                                    *)
+(*    Stephen Kell                                                        *)
+(*    Mark Wassell                                                        *)
+(*                                                                        *)
+(*  All rights reserved.                                                  *)
+(*                                                                        *)
+(*  This software was developed by the University of Cambridge Computer   *)
+(*  Laboratory as part of the Rigorous Engineering of Mainstream Systems  *)
+(*  (REMS) project, funded by EPSRC grant EP/K008528/1.                   *)
+(*                                                                        *)
+(*  Redistribution and use in source and binary forms, with or without    *)
+(*  modification, are permitted provided that the following conditions    *)
+(*  are met:                                                              *)
+(*  1. Redistributions of source code must retain the above copyright     *)
+(*     notice, this list of conditions and the following disclaimer.      *)
+(*  2. Redistributions in binary form must reproduce the above copyright  *)
+(*     notice, this list of conditions and the following disclaimer in    *)
+(*     the documentation and/or other materials provided with the         *)
+(*     distribution.                                                      *)
+(*                                                                        *)
+(*  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''    *)
+(*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED     *)
+(*  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A       *)
+(*  PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR   *)
+(*  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,          *)
+(*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      *)
+(*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF      *)
+(*  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND   *)
+(*  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,    *)
+(*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT    *)
+(*  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF    *)
+(*  SUCH DAMAGE.                                                          *)
+(**************************************************************************)
+
+type 'a parse_result =
+  | Ok of 'a * Str.split_result list
+  | Fail
+
+type 'a parser = Str.split_result list -> 'a parse_result
+
+let (>>=) (m : 'a parser) (f : 'a -> 'b parser) (toks : Str.split_result list) =
+  match m toks with
+  | Ok (r, toks) -> f r toks
+  | Fail -> Fail
+
+let pmap f m toks =
+  match m toks with
+  | Ok (r, toks) -> Ok (f r, toks)
+  | Fail -> Fail
+
+let token f = function
+  | tok :: toks ->
+     begin match f tok with
+     | Some x -> Ok (x, toks)
+     | None -> Fail
+     end
+  | [] -> Fail
+
+let preturn x toks = Ok (x, toks)
+
+let rec plist m toks =
+  match m toks with
+  | Ok (x, toks) ->
+     begin match plist m toks with
+     | Ok (xs, toks) -> Ok (x :: xs, toks)
+     | Fail -> Fail
+     end
+  | Fail -> Ok ([], toks)
+
+let pchoose m n toks =
+  match m toks with
+  | Fail -> n toks
+  | Ok (x, toks) -> Ok (x, toks)
+
+let parse p delim_regexp input =
+  let delim = Str.regexp delim_regexp in
+  let tokens = Str.full_split delim input in
+  let non_whitespace = function
+    | Str.Delim d when String.trim d = "" -> false
+    | _ -> true
+  in
+  let tokens = List.filter non_whitespace tokens in
+  match p tokens with
+  | Ok (result, []) -> Some result
+  | Ok (result, _) -> None
+  | Fail -> None