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(* camlp4r *)
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(****************************************************************************)
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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 2006 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 Camlp4 *)
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(* source tree. *)
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(* *)
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(****************************************************************************)
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(* Authors:
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* - Nicolas Pouillard: initial version
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*)
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module Make (Ast : Sig.Camlp4Ast) = struct
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module S = Set.Make String;
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class c_fold_pattern_vars ['accu] f init =
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object
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inherit Ast.fold as super;
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value acc = init;
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method acc : 'accu = acc;
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method patt =
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fun
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[ <:patt< $lid:s$ >> | <:patt< ~ $s$ >> | <:patt< ? $s$ >> ->
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{< acc = f s acc >}
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| p -> super#patt p ];
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end;
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value fold_pattern_vars f p init = ((new c_fold_pattern_vars f init)#patt p)#acc;
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value rec fold_binding_vars f bi acc =
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match bi with
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[ <:binding< $bi1$ and $bi2$ >> ->
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fold_binding_vars f bi1 (fold_binding_vars f bi2 acc)
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| <:binding< $p$ = $_$ >> -> fold_pattern_vars f p acc
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| <:binding<>> -> acc
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| <:binding< $anti:_$ >> -> assert False ];
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class fold_free_vars ['accu] (f : string -> 'accu -> 'accu) ?(env_init = S.empty) free_init =
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object (o)
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inherit Ast.fold as super;
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value free : 'accu = free_init;
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value env : S.t = env_init;
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method free = free;
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method set_env env = {< env = env >};
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method add_atom s = {< env = S.add s env >};
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method add_patt p = {< env = fold_pattern_vars S.add p env >};
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method add_binding bi = {< env = fold_binding_vars S.add bi env >};
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method expr =
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fun
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[ <:expr< $lid:s$ >> | <:expr< ~ $s$ >> | <:expr< ? $s$ >> ->
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if S.mem s env then o else {< free = f s free >}
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| <:expr< let $bi$ in $e$ >> ->
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(((o#add_binding bi)#expr e)#set_env env)#binding bi
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| <:expr< let rec $bi$ in $e$ >> ->
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(((o#add_binding bi)#expr e)#binding bi)#set_env env
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| <:expr< for $p$ = $e1$ $to:_$ $e2$ do { $e3$ } >> ->
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((((o#expr e1)#expr e2)#patt p)#expr e3)#set_env env
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| <:expr< $id:_$ >> | <:expr< new $_$ >> -> o
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| <:expr< object ($p$) $cst$ end >> ->
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((o#add_patt p)#class_str_item cst)#set_env env
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| e -> super#expr e ];
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method match_case =
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fun
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[ <:match_case< $p$ when $e1$ -> $e2$ >> ->
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(((o#add_patt p)#expr e1)#expr e2)#set_env env
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| m -> super#match_case m ];
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method str_item =
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fun
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[ <:str_item< external $s$ : $t$ = $_$ >> ->
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(o#ctyp t)#add_atom s
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| <:str_item< value $bi$ >> ->
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(o#binding bi)#add_binding bi
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| <:str_item< value rec $bi$ >> ->
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(o#add_binding bi)#binding bi
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| st -> super#str_item st ];
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method class_expr =
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fun
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[ <:class_expr< fun $p$ -> $ce$ >> ->
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((o#add_patt p)#class_expr ce)#set_env env
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| <:class_expr< let $bi$ in $ce$ >> ->
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(((o#binding bi)#add_binding bi)#class_expr ce)#set_env env
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| <:class_expr< let rec $bi$ in $ce$ >> ->
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(((o#add_binding bi)#binding bi)#class_expr ce)#set_env env
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| <:class_expr< object ($p$) $cst$ end >> ->
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((o#add_patt p)#class_str_item cst)#set_env env
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| ce -> super#class_expr ce ];
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method class_str_item =
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fun
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[ <:class_str_item< inherit $override:_$ $_$ >> as cst -> super#class_str_item cst
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| <:class_str_item< inherit $override:_$ $ce$ as $s$ >> ->
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(o#class_expr ce)#add_atom s
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| <:class_str_item< value $override:_$ $mutable:_$ $s$ = $e$ >> ->
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(o#expr e)#add_atom s
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| <:class_str_item< value virtual $mutable:_$ $s$ : $t$ >> ->
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(o#ctyp t)#add_atom s
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| cst -> super#class_str_item cst ];
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method module_expr = fun
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[ <:module_expr< struct $st$ end >> ->
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(o#str_item st)#set_env env
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| me -> super#module_expr me ];
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end;
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value free_vars env_init e =
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let fold = new fold_free_vars S.add ~env_init S.empty in (fold#expr e)#free;
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end;
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