Coccinelle release 1.0.0-rc3

[bpt/coccinelle.git] / parsing_cocci / ast0toast.ml

(*
 * Copyright 2010, INRIA, University of Copenhagen
 * Julia Lawall, Rene Rydhof Hansen, Gilles Muller, Nicolas Palix
 * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen
 * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix
 * This file is part of Coccinelle.
 *
 * Coccinelle is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, according to version 2 of the License.
 *
 * Coccinelle is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Coccinelle.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The authors reserve the right to distribute this or future versions of
 * Coccinelle under other licenses.
 *)


(* Arities matter for the minus slice, but not for the plus slice. *)

(* + only allowed on code in a nest (in_nest = true).  ? only allowed on
rule_elems, and on subterms if the context is ? also. *)

module Ast0 = Ast0_cocci
module Ast = Ast_cocci
module V0 = Visitor_ast0
module VT0 = Visitor_ast0_types

let unitary = Type_cocci.Unitary

let ctr = ref 0
let get_ctr _ =
  let c = !ctr in
  ctr := !ctr + 1;
  c

(* --------------------------------------------------------------------- *)
(* Move plus tokens from the MINUS and CONTEXT structured nodes to the
corresponding leftmost and rightmost mcodes *)

let inline_mcodes =
  let bind x y = () in
  let option_default = () in
  let mcode _ = () in
  let do_nothing r k e =
    k e;
    let einfo = Ast0.get_info e in
    match (Ast0.get_mcodekind e) with
      Ast0.MINUS(replacements) ->
	(match !replacements with
	  (Ast.NOREPLACEMENT,_) -> ()
	| replacements ->
	    let minus_try = function
		(true,mc) ->
		  if List.for_all
		      (function
			  Ast0.MINUS(mreplacements) -> true | _ -> false)
		      mc
		  then
		    (List.iter
		       (function
			   Ast0.MINUS(mreplacements) ->
			     mreplacements := replacements
			 | _ -> ())
		       mc;
		     true)
		  else false
	      | _ -> false in
	    if not (minus_try(einfo.Ast0.attachable_start,
			      einfo.Ast0.mcode_start)
		      or
    		    minus_try(einfo.Ast0.attachable_end,
			      einfo.Ast0.mcode_end))
	    then
	      failwith "minus tree should not have bad code on both sides")
    | Ast0.CONTEXT(befaft)
    | Ast0.MIXED(befaft) ->
	let concat starter startinfo ender endinfo =
	  let lst =
	    match (starter,ender) with
	      ([],_) -> ender
	    | (_,[]) -> starter
	    | _ ->
		if startinfo.Ast0.tline_end = endinfo.Ast0.tline_start
		then (* put them in the same inner list *)
		  let last = List.hd (List.rev starter) in
		  let butlast = List.rev(List.tl(List.rev starter)) in
		  butlast @ (last@(List.hd ender)) :: (List.tl ender)
		else starter @ ender in
	  (lst,
	   {endinfo with Ast0.tline_start = startinfo.Ast0.tline_start}) in
	let attach_bef bef beforeinfo befit = function
	    (true,mcl) ->
	      List.iter
		(function
		    Ast0.MINUS(mreplacements) ->
		      (match !mreplacements with
			(Ast.NOREPLACEMENT,tokeninfo) ->
			  mreplacements :=
			    (Ast.REPLACEMENT(bef,befit),beforeinfo)
		      |	(Ast.REPLACEMENT(anythings,it),tokeninfo) ->
			  let (newbef,newinfo) =
			    concat bef beforeinfo anythings tokeninfo in
			  let it = Ast.lub_count befit it in
			  mreplacements :=
			    (Ast.REPLACEMENT(newbef,it),newinfo))
		  | Ast0.CONTEXT(mbefaft) ->
		      (match !mbefaft with
			(Ast.BEFORE(mbef,it),mbeforeinfo,a) ->
			  let (newbef,newinfo) =
			    concat bef beforeinfo mbef mbeforeinfo in
			  let it = Ast.lub_count befit it in
			  mbefaft := (Ast.BEFORE(newbef,it),newinfo,a)
		      | (Ast.AFTER(maft,it),_,a) ->
			  let it = Ast.lub_count befit it in
			  mbefaft :=
			    (Ast.BEFOREAFTER(bef,maft,it),beforeinfo,a)
		      | (Ast.BEFOREAFTER(mbef,maft,it),mbeforeinfo,a) ->
			  let (newbef,newinfo) =
			    concat bef beforeinfo mbef mbeforeinfo in
			  let it = Ast.lub_count befit it in
			  mbefaft :=
			    (Ast.BEFOREAFTER(newbef,maft,it),newinfo,a)
		      | (Ast.NOTHING,_,a) ->
			  mbefaft :=
			    (Ast.BEFORE(bef,befit),beforeinfo,a))
		  |	_ -> failwith "unexpected annotation")
		mcl
	  | _ ->
	      Printf.printf "before %s\n" (Dumper.dump bef);
	      failwith
		"context tree should not have bad code before" in
	let attach_aft aft afterinfo aftit = function
	    (true,mcl) ->
	      List.iter
		(function
		    Ast0.MINUS(mreplacements) ->
		      (match !mreplacements with
			(Ast.NOREPLACEMENT,tokeninfo) ->
			  mreplacements :=
			    (Ast.REPLACEMENT(aft,aftit),afterinfo)
		      |	(Ast.REPLACEMENT(anythings,it),tokeninfo) ->
			  let (newaft,newinfo) =
			    concat anythings tokeninfo aft afterinfo in
			  let it = Ast.lub_count aftit it in
			  mreplacements :=
			    (Ast.REPLACEMENT(newaft,it),newinfo))
		  | Ast0.CONTEXT(mbefaft) ->
		      (match !mbefaft with
			(Ast.BEFORE(mbef,it),b,_) ->
			  let it = Ast.lub_count aftit it in
			  mbefaft :=
			    (Ast.BEFOREAFTER(mbef,aft,it),b,afterinfo)
		      | (Ast.AFTER(maft,it),b,mafterinfo) ->
			  let (newaft,newinfo) =
			    concat maft mafterinfo aft afterinfo in
			  let it = Ast.lub_count aftit it in
			  mbefaft := (Ast.AFTER(newaft,it),b,newinfo)
		      | (Ast.BEFOREAFTER(mbef,maft,it),b,mafterinfo) ->
			  let (newaft,newinfo) =
			    concat maft mafterinfo aft afterinfo in
			  let it = Ast.lub_count aftit it in
			  mbefaft :=
			    (Ast.BEFOREAFTER(mbef,newaft,it),b,newinfo)
		      | (Ast.NOTHING,b,_) ->
			  mbefaft := (Ast.AFTER(aft,aftit),b,afterinfo))
		  |	_ -> failwith "unexpected annotation")
		mcl
	  | _ ->
	      failwith
		"context tree should not have bad code after" in
	(match !befaft with
	  (Ast.BEFORE(bef,it),beforeinfo,_) ->
	    attach_bef bef beforeinfo it
	      (einfo.Ast0.attachable_start,einfo.Ast0.mcode_start)
	| (Ast.AFTER(aft,it),_,afterinfo) ->
	    attach_aft aft afterinfo it
	      (einfo.Ast0.attachable_end,einfo.Ast0.mcode_end)
	| (Ast.BEFOREAFTER(bef,aft,it),beforeinfo,afterinfo) ->
	    attach_bef bef beforeinfo it
	      (einfo.Ast0.attachable_start,einfo.Ast0.mcode_start);
	    attach_aft aft afterinfo it
	      (einfo.Ast0.attachable_end,einfo.Ast0.mcode_end)
	| (Ast.NOTHING,_,_) -> ())
    | Ast0.PLUS _ -> () in
  V0.flat_combiner bind option_default
    mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode
    mcode mcode
    do_nothing do_nothing do_nothing do_nothing do_nothing do_nothing
    do_nothing do_nothing do_nothing do_nothing do_nothing do_nothing
    do_nothing do_nothing do_nothing

(* --------------------------------------------------------------------- *)
(* For function declarations.  Can't use the mcode at the root, because that
might be mixed when the function contains ()s, where agglomeration of -s is
not possible. *)

let check_allminus =
  let donothing r k e = k e in
  let bind x y = x && y in
  let option_default = true in
  let mcode (_,_,_,mc,_,_) =
    match mc with
      Ast0.MINUS(r) -> let (plusses,_) = !r in plusses = Ast.NOREPLACEMENT
    | _ -> false in

  (* special case for disj *)
  let ident r k e =
    match Ast0.unwrap e with
      Ast0.DisjId(starter,id_list,mids,ender) ->
	List.for_all r.VT0.combiner_rec_ident id_list
    | _ -> k e in

  let expression r k e =
    match Ast0.unwrap e with
      Ast0.DisjExpr(starter,expr_list,mids,ender) ->
	List.for_all r.VT0.combiner_rec_expression expr_list
    | _ -> k e in

  let declaration r k e =
    match Ast0.unwrap e with
      Ast0.DisjDecl(starter,decls,mids,ender) ->
	List.for_all r.VT0.combiner_rec_declaration decls
    | _ -> k e in

  let typeC r k e =
    match Ast0.unwrap e with
      Ast0.DisjType(starter,decls,mids,ender) ->
	List.for_all r.VT0.combiner_rec_typeC decls
    | _ -> k e in

  let statement r k e =
    match Ast0.unwrap e with
      Ast0.Disj(starter,statement_dots_list,mids,ender) ->
	List.for_all r.VT0.combiner_rec_statement_dots statement_dots_list
    | _ -> k e in

  let case_line r k e =
    match Ast0.unwrap e with
      Ast0.DisjCase(starter,case_lines,mids,ender) ->
	List.for_all r.VT0.combiner_rec_case_line case_lines
    | _ -> k e in

  V0.flat_combiner bind option_default
    mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode
    mcode mcode
    donothing donothing donothing donothing donothing donothing
    ident expression typeC donothing donothing declaration
    statement case_line donothing

(* --------------------------------------------------------------------- *)
(* --------------------------------------------------------------------- *)

let get_option fn = function
    None -> None
  | Some x -> Some (fn x)

(* --------------------------------------------------------------------- *)
(* --------------------------------------------------------------------- *)
(* Mcode *)

let convert_info info =
  let strings_to_s l =
    List.map
      (function (s,info) -> (s,info.Ast0.line_start,info.Ast0.column))
      l in
  { Ast.line = info.Ast0.pos_info.Ast0.line_start;
    Ast.column = info.Ast0.pos_info.Ast0.column;
    Ast.strbef = strings_to_s info.Ast0.strings_before;
    Ast.straft = strings_to_s info.Ast0.strings_after;}

let convert_mcodekind adj = function
    Ast0.MINUS(replacements) ->
      let (replacements,_) = !replacements in
      Ast.MINUS(Ast.NoPos,[],Ast.ADJ adj,replacements)
  | Ast0.PLUS count -> Ast.PLUS count
  | Ast0.CONTEXT(befaft) ->
      let (befaft,_,_) = !befaft in
      Ast.CONTEXT(Ast.NoPos,befaft)
  | Ast0.MIXED(_) -> failwith "not possible for mcode"

let convert_allminus_mcodekind allminus = function
    Ast0.CONTEXT(befaft) ->
      let (befaft,_,_) = !befaft in
      if allminus
      then
	(match befaft with
	  Ast.NOTHING ->
	    Ast.MINUS(Ast.NoPos,[],Ast.ALLMINUS,Ast.NOREPLACEMENT)
	| Ast.BEFORE(a,ct) | Ast.AFTER(a,ct) ->
	    Ast.MINUS(Ast.NoPos,[],Ast.ALLMINUS,Ast.REPLACEMENT(a,ct))
	| Ast.BEFOREAFTER(b,a,ct) ->
	    Ast.MINUS(Ast.NoPos,[],Ast.ALLMINUS,Ast.REPLACEMENT(b@a,ct)))
      else Ast.CONTEXT(Ast.NoPos,befaft)
  | _ -> failwith "convert_allminus_mcodekind: unexpected mcodekind"

let pos_mcode(term,_,info,mcodekind,pos,adj) =
  (* avoids a recursion problem *)
  (term,convert_info info,convert_mcodekind adj mcodekind,[])

let mcode (term,_,info,mcodekind,pos,adj) =
  let pos =
    List.map
      (function Ast0.MetaPos(pos,constraints,per) ->
	Ast.MetaPos(pos_mcode pos,constraints,per,unitary,false))
      !pos in
  (term,convert_info info,convert_mcodekind adj mcodekind,pos)

(* --------------------------------------------------------------------- *)
(* Dots *)
let wrap ast line isos =
  {(Ast.make_term ast) with Ast.node_line = line;
    Ast.iso_info = isos}

let rewrap ast0 isos ast =
  wrap ast ((Ast0.get_info ast0).Ast0.pos_info.Ast0.line_start) isos

let no_isos = []

(* no isos on tokens *)
let tokenwrap (_,info,_,_) s ast = wrap ast info.Ast.line no_isos
let iso_tokenwrap (_,info,_,_) s ast iso = wrap ast info.Ast.line iso

let dots fn d =
  rewrap d no_isos
    (match Ast0.unwrap d with
      Ast0.DOTS(x) -> Ast.DOTS(List.map fn x)
    | Ast0.CIRCLES(x) -> Ast.CIRCLES(List.map fn x)
    | Ast0.STARS(x) -> Ast.STARS(List.map fn x))

(* commas in dotted lists, here due to polymorphism restrictions *)

let add_comma is_comma make_comma itemlist =
  match Ast0.unwrap itemlist with
    Ast0.DOTS(x) ->
      (match List.rev x with
	[] -> itemlist
      | e::es ->
	  if is_comma e
	  then itemlist
	  else
	    let comma =
	      match Ast0.get_mcodekind e with
		Ast0.MINUS(_) -> (Ast0.make_minus_mcode ",")
	      |	_ -> (Ast0.make_mcode ",") in
	    Ast0.rewrap itemlist
	      (Ast0.DOTS
		 (List.rev (Ast0.rewrap e (make_comma comma) :: (e::es)))))
  | _ -> failwith "not possible"

let add_exp_comma =
  add_comma
    (function x -> match Ast0.unwrap x with Ast0.EComma _ -> true | _ -> false)
    (function x -> Ast0.EComma x)

and add_init_comma =
  add_comma
    (function x -> match Ast0.unwrap x with Ast0.IComma _ -> true | _ -> false)
    (function x -> Ast0.IComma x)

(* --------------------------------------------------------------------- *)
(* Identifier *)

let rec do_isos l = List.map (function (nm,x) -> (nm,anything x)) l

and ident i =
  rewrap i (do_isos (Ast0.get_iso i))
    (match Ast0.unwrap i with
      Ast0.Id(name) -> Ast.Id(mcode name)
    | Ast0.DisjId(_,id_list,_,_) ->
	Ast.DisjId(List.map ident id_list)
    | Ast0.MetaId(name,constraints,_,_) ->
	Ast.MetaId(mcode name,constraints,unitary,false)
    | Ast0.MetaFunc(name,constraints,_) ->
	Ast.MetaFunc(mcode name,constraints,unitary,false)
    | Ast0.MetaLocalFunc(name,constraints,_) ->
	Ast.MetaLocalFunc(mcode name,constraints,unitary,false)
    | Ast0.OptIdent(id) -> Ast.OptIdent(ident id)
    | Ast0.UniqueIdent(id) -> Ast.UniqueIdent(ident id))

(* --------------------------------------------------------------------- *)
(* Expression *)

and expression e =
  let e1 =
  rewrap e (do_isos (Ast0.get_iso e))
    (match Ast0.unwrap e with
      Ast0.Ident(id) -> Ast.Ident(ident id)
    | Ast0.Constant(const) ->
	Ast.Constant(mcode const)
    | Ast0.FunCall(fn,lp,args,rp) ->
	let fn = expression fn in
	let lp = mcode lp in
	let args = dots expression args in
	let rp = mcode rp in
	Ast.FunCall(fn,lp,args,rp)
    | Ast0.Assignment(left,op,right,simple) ->
	Ast.Assignment(expression left,mcode op,expression right,simple)
    | Ast0.CondExpr(exp1,why,exp2,colon,exp3) ->
	let exp1 = expression exp1 in
	let why = mcode why in
	let exp2 = get_option expression exp2 in
	let colon = mcode colon in
	let exp3 = expression exp3 in
	Ast.CondExpr(exp1,why,exp2,colon,exp3)
    | Ast0.Postfix(exp,op) ->
	Ast.Postfix(expression exp,mcode op)
    | Ast0.Infix(exp,op) ->
	Ast.Infix(expression exp,mcode op)
    | Ast0.Unary(exp,op) ->
	Ast.Unary(expression exp,mcode op)
    | Ast0.Binary(left,op,right) ->
	Ast.Binary(expression left,mcode op,expression right)
    | Ast0.Nested(left,op,right) ->
	Ast.Nested(expression left,mcode op,expression right)
    | Ast0.Paren(lp,exp,rp) ->
	Ast.Paren(mcode lp,expression exp,mcode rp)
    | Ast0.ArrayAccess(exp1,lb,exp2,rb) ->
	Ast.ArrayAccess(expression exp1,mcode lb,expression exp2,mcode rb)
    | Ast0.RecordAccess(exp,pt,field) ->
	Ast.RecordAccess(expression exp,mcode pt,ident field)
    | Ast0.RecordPtAccess(exp,ar,field) ->
	Ast.RecordPtAccess(expression exp,mcode ar,ident field)
    | Ast0.Cast(lp,ty,rp,exp) ->
	Ast.Cast(mcode lp,typeC ty,mcode rp,expression exp)
    | Ast0.SizeOfExpr(szf,exp) ->
	Ast.SizeOfExpr(mcode szf,expression exp)
    | Ast0.SizeOfType(szf,lp,ty,rp) ->
	Ast.SizeOfType(mcode szf, mcode lp,typeC ty,mcode rp)
    | Ast0.TypeExp(ty) -> Ast.TypeExp(typeC ty)
    | Ast0.MetaErr(name,cstrts,_)  ->
	  Ast.MetaErr(mcode name,constraints cstrts,unitary,false)
    | Ast0.MetaExpr(name,cstrts,ty,form,_)  ->
	  Ast.MetaExpr(mcode name,constraints cstrts,unitary,ty,form,false)
    | Ast0.MetaExprList(name,lenname,_) ->
	Ast.MetaExprList(mcode name,do_lenname lenname,unitary,false)
    | Ast0.EComma(cm)         -> Ast.EComma(mcode cm)
    | Ast0.DisjExpr(_,exps,_,_)     ->
	Ast.DisjExpr(List.map expression exps)
    | Ast0.NestExpr(starter,exp_dots,ender,whencode,multi) ->
	let starter = mcode starter in
	let whencode = get_option expression whencode in
	let ender = mcode ender in
	Ast.NestExpr(starter,dots expression exp_dots,ender,whencode,multi)
    | Ast0.Edots(dots,whencode) ->
	let dots = mcode dots in
	let whencode = get_option expression whencode in
	Ast.Edots(dots,whencode)
    | Ast0.Ecircles(dots,whencode) ->
	let dots = mcode dots in
	let whencode = get_option expression whencode in
	Ast.Ecircles(dots,whencode)
    | Ast0.Estars(dots,whencode) ->
	let dots = mcode dots in
	let whencode = get_option expression whencode in
	Ast.Estars(dots,whencode)
    | Ast0.OptExp(exp) -> Ast.OptExp(expression exp)
    | Ast0.UniqueExp(exp) -> Ast.UniqueExp(expression exp)) in
  if Ast0.get_test_exp e then Ast.set_test_exp e1 else e1

and expression_dots ed = dots expression ed

and constraints c =
  match c with
      Ast0.NoConstraint        -> Ast.NoConstraint
    | Ast0.NotIdCstrt   idctrt -> Ast.NotIdCstrt idctrt
    | Ast0.NotExpCstrt  exps   -> Ast.NotExpCstrt (List.map expression exps)
    | Ast0.SubExpCstrt  ids    -> Ast.SubExpCstrt ids

and do_lenname = function
    Ast0.MetaListLen(nm) -> Ast.MetaListLen(mcode nm,unitary,false)
  | Ast0.CstListLen n -> Ast.CstListLen n
  | Ast0.AnyListLen -> Ast.AnyListLen

(* --------------------------------------------------------------------- *)
(* Types *)

and rewrap_iso t t1 = rewrap t (do_isos (Ast0.get_iso t)) t1

and typeC t =
  rewrap t (do_isos (Ast0.get_iso t))
    (match Ast0.unwrap t with
      Ast0.ConstVol(cv,ty) ->
	let rec collect_disjs t =
	  match Ast0.unwrap t with
	    Ast0.DisjType(_,types,_,_) ->
	      if Ast0.get_iso t = []
	      then List.concat (List.map collect_disjs types)
	      else failwith "unexpected iso on a disjtype"
	  | _ -> [t] in
	let res =
	  List.map
	    (function ty ->
	      Ast.Type
		(Some (mcode cv),rewrap_iso ty (base_typeC ty)))
	    (collect_disjs ty) in
	(* one could worry that isos are lost because we flatten the
	   disjunctions.  but there should not be isos on the disjunctions
	   themselves. *)
	(match res with
	  [ty] -> ty
	| types -> Ast.DisjType(List.map (rewrap t no_isos) types))
    | Ast0.BaseType(_) | Ast0.Signed(_,_) | Ast0.Pointer(_,_)
    | Ast0.FunctionPointer(_,_,_,_,_,_,_) | Ast0.FunctionType(_,_,_,_)
    | Ast0.Array(_,_,_,_) | Ast0.EnumName(_,_) | Ast0.StructUnionName(_,_)
    | Ast0.StructUnionDef(_,_,_,_) | Ast0.EnumDef(_,_,_,_)
    | Ast0.TypeName(_) | Ast0.MetaType(_,_) ->
	Ast.Type(None,rewrap t no_isos (base_typeC t))
    | Ast0.DisjType(_,types,_,_) -> Ast.DisjType(List.map typeC types)
    | Ast0.OptType(ty) -> Ast.OptType(typeC ty)
    | Ast0.UniqueType(ty) -> Ast.UniqueType(typeC ty))

and base_typeC t =
  match Ast0.unwrap t with
    Ast0.BaseType(ty,strings) -> Ast.BaseType(ty,List.map mcode strings)
  | Ast0.Signed(sgn,ty) ->
      Ast.SignedT(mcode sgn,
		  get_option (function x -> rewrap_iso x (base_typeC x)) ty)
  | Ast0.Pointer(ty,star) -> Ast.Pointer(typeC ty,mcode star)
  | Ast0.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
      Ast.FunctionPointer
	(typeC ty,mcode lp1,mcode star,mcode rp1,
	 mcode lp2,parameter_list params,mcode rp2)
  | Ast0.FunctionType(ret,lp,params,rp) ->
      let allminus = check_allminus.VT0.combiner_rec_typeC t in
      Ast.FunctionType
	(allminus,get_option typeC ret,mcode lp,
	 parameter_list params,mcode rp)
  | Ast0.Array(ty,lb,size,rb) ->
      Ast.Array(typeC ty,mcode lb,get_option expression size,mcode rb)
  | Ast0.EnumName(kind,name) ->
      Ast.EnumName(mcode kind,get_option ident name)
  | Ast0.EnumDef(ty,lb,ids,rb) ->
      let ids = add_exp_comma ids in
      Ast.EnumDef(typeC ty,mcode lb,dots expression ids,mcode rb)
  | Ast0.StructUnionName(kind,name) ->
      Ast.StructUnionName(mcode kind,get_option ident name)
  | Ast0.StructUnionDef(ty,lb,decls,rb) ->
      Ast.StructUnionDef(typeC ty,mcode lb,
			 dots declaration decls,
			 mcode rb)
  | Ast0.TypeName(name) -> Ast.TypeName(mcode name)
  | Ast0.MetaType(name,_) ->
      Ast.MetaType(mcode name,unitary,false)
  | _ -> failwith "ast0toast: unexpected type"

(* --------------------------------------------------------------------- *)
(* Variable declaration *)
(* Even if the Cocci program specifies a list of declarations, they are
   split out into multiple declarations of a single variable each. *)

and declaration d =
  rewrap d (do_isos (Ast0.get_iso d))
    (match Ast0.unwrap d with
      Ast0.MetaDecl(name,_) -> Ast.MetaDecl(mcode name,unitary,false)
    | Ast0.MetaField(name,_) -> Ast.MetaField(mcode name,unitary,false)
    | Ast0.MetaFieldList(name,lenname,_) ->
	Ast.MetaFieldList(mcode name,do_lenname lenname,unitary,false)
    | Ast0.Init(stg,ty,id,eq,ini,sem) ->
	let stg = get_option mcode stg in
	let ty = typeC ty in
	let id = ident id in
	let eq = mcode eq in
	let ini = initialiser ini in
	let sem = mcode sem in
	Ast.Init(stg,ty,id,eq,ini,sem)
    | Ast0.UnInit(stg,ty,id,sem) ->
	(match Ast0.unwrap ty with
	  Ast0.FunctionType(tyx,lp1,params,rp1) ->
	    let allminus = check_allminus.VT0.combiner_rec_declaration d in
	    Ast.UnInit(get_option mcode stg,
		       rewrap ty (do_isos (Ast0.get_iso ty))
			 (Ast.Type
			    (None,
			     rewrap ty no_isos
			       (Ast.FunctionType
				  (allminus,get_option typeC tyx,mcode lp1,
				   parameter_list params,mcode rp1)))),
		       ident id,mcode sem)
	| _ -> Ast.UnInit(get_option mcode stg,typeC ty,ident id,mcode sem))
    | Ast0.MacroDecl(name,lp,args,rp,sem) ->
	let name = ident name in
	let lp = mcode lp in
	let args = dots expression args in
	let rp = mcode rp in
	let sem = mcode sem in
	Ast.MacroDecl(name,lp,args,rp,sem)
    | Ast0.TyDecl(ty,sem) -> Ast.TyDecl(typeC ty,mcode sem)
    | Ast0.Typedef(stg,ty,id,sem) ->
	let id = typeC id in
	(match Ast.unwrap id with
	  Ast.Type(None,id) -> (* only MetaType or Id *)
	    Ast.Typedef(mcode stg,typeC ty,id,mcode sem)
	| _ -> failwith "bad typedef")
    | Ast0.DisjDecl(_,decls,_,_) -> Ast.DisjDecl(List.map declaration decls)
    | Ast0.Ddots(dots,whencode) ->
	let dots = mcode dots in
	let whencode = get_option declaration whencode in
	Ast.Ddots(dots,whencode)
    | Ast0.OptDecl(decl) -> Ast.OptDecl(declaration decl)
    | Ast0.UniqueDecl(decl) -> Ast.UniqueDecl(declaration decl))

and declaration_dots l = dots declaration l

(* --------------------------------------------------------------------- *)
(* Initialiser *)

and strip_idots initlist =
  let isminus mc =
    match Ast0.get_mcode_mcodekind mc with
      Ast0.MINUS _ -> true
    | _ -> false in
  match Ast0.unwrap initlist with
    Ast0.DOTS(l) ->
      let l =
	match List.rev l with
	  [] | [_] -> l
	| x::y::xs ->
	    (match (Ast0.unwrap x,Ast0.unwrap y) with
	      (Ast0.IComma _,Ast0.Idots _) ->
		(* drop comma that was added by add_comma *)
		List.rev (y::xs)
	    | _ -> l) in
      let (whencode,init,dotinfo) =
	let rec loop = function
	    [] -> ([],[],[])
	  | x::rest ->
	      (match Ast0.unwrap x with
		Ast0.Idots(dots,Some whencode) ->
		  let (restwhen,restinit,dotinfo) = loop rest in
		  (whencode :: restwhen, restinit,
		    (isminus dots)::dotinfo)
	      |	Ast0.Idots(dots,None) ->
		  let (restwhen,restinit,dotinfo) = loop rest in
		  (restwhen, restinit, (isminus dots)::dotinfo)
	      |	_ -> 
		  let (restwhen,restinit,dotinfo) = loop rest in
		  (restwhen,x::restinit,dotinfo)) in
	loop l in
      let allminus =
	if List.for_all (function x -> not x) dotinfo
	then false (* false if no dots *)
	else
	  if List.for_all (function x -> x) dotinfo
	  then true
	  else failwith "inconsistent annotations on initialiser list dots" in
      (whencode, init, allminus)
  | Ast0.CIRCLES(x) | Ast0.STARS(x) -> failwith "not possible for an initlist"

and initialiser i =
  rewrap i no_isos
    (match Ast0.unwrap i with
      Ast0.MetaInit(name,_) -> Ast.MetaInit(mcode name,unitary,false)
    | Ast0.MetaInitList(name,lenname,_) ->
	Ast.MetaInitList(mcode name,do_lenname lenname,unitary,false)
    | Ast0.InitExpr(exp) -> Ast.InitExpr(expression exp)
    | Ast0.InitList(lb,initlist,rb,true) ->
	let initlist = add_init_comma initlist in
	Ast.ArInitList(mcode lb,dots initialiser initlist,mcode rb)
    | Ast0.InitList(lb,initlist,rb,false) ->
	let initlist = add_init_comma initlist in
	let (whencode,initlist,allminus) = strip_idots initlist in
	Ast.StrInitList
	  (allminus,mcode lb,List.map initialiser initlist,mcode rb,
	   List.map initialiser whencode)
    | Ast0.InitGccExt(designators,eq,ini) ->
	Ast.InitGccExt(List.map designator designators,mcode eq,
		       initialiser ini)
    | Ast0.InitGccName(name,eq,ini) ->
	Ast.InitGccName(ident name,mcode eq,initialiser ini)
    | Ast0.IComma(comma) -> Ast.IComma(mcode comma)
    | Ast0.Idots(dots,whencode) ->
	let dots = mcode dots in
	let whencode = get_option initialiser whencode in
	Ast.Idots(dots,whencode)
    | Ast0.OptIni(ini) -> Ast.OptIni(initialiser ini)
    | Ast0.UniqueIni(ini) -> Ast.UniqueIni(initialiser ini))

and designator = function
    Ast0.DesignatorField(dot,id) -> Ast.DesignatorField(mcode dot,ident id)
  | Ast0.DesignatorIndex(lb,exp,rb) ->
      Ast.DesignatorIndex(mcode lb, expression exp, mcode rb)
  | Ast0.DesignatorRange(lb,min,dots,max,rb) ->
      Ast.DesignatorRange(mcode lb,expression min,mcode dots,expression max,
			  mcode rb)

(* --------------------------------------------------------------------- *)
(* Parameter *)

and parameterTypeDef p =
  rewrap p no_isos
    (match Ast0.unwrap p with
      Ast0.VoidParam(ty) -> Ast.VoidParam(typeC ty)
    | Ast0.Param(ty,id) -> Ast.Param(typeC ty,get_option ident id)
    | Ast0.MetaParam(name,_) ->
	Ast.MetaParam(mcode name,unitary,false)
    | Ast0.MetaParamList(name,lenname,_) ->
	Ast.MetaParamList(mcode name,do_lenname lenname,unitary,false)
    | Ast0.PComma(cm) -> Ast.PComma(mcode cm)
    | Ast0.Pdots(dots) -> Ast.Pdots(mcode dots)
    | Ast0.Pcircles(dots) -> Ast.Pcircles(mcode dots)
    | Ast0.OptParam(param) -> Ast.OptParam(parameterTypeDef param)
    | Ast0.UniqueParam(param) -> Ast.UniqueParam(parameterTypeDef param))

and parameter_list l = dots parameterTypeDef l

(* --------------------------------------------------------------------- *)
(* Top-level code *)

and statement s =
  let rec statement seqible s =
    let rewrap_stmt ast0 ast =
      let befaft =
	match Ast0.get_dots_bef_aft s with
	  Ast0.NoDots -> Ast.NoDots
	| Ast0.DroppingBetweenDots s ->
	    Ast.DroppingBetweenDots (statement seqible s,get_ctr())
	| Ast0.AddingBetweenDots s ->
	    Ast.AddingBetweenDots (statement seqible s,get_ctr()) in
      Ast.set_dots_bef_aft befaft (rewrap ast0 no_isos ast) in
    let rewrap_rule_elem ast0 ast =
      rewrap ast0 (do_isos (Ast0.get_iso ast0)) ast in
    rewrap_stmt s
      (match Ast0.unwrap s with
	Ast0.Decl((_,bef),decl) ->
	  let allminus = check_allminus.VT0.combiner_rec_statement s in
	  Ast.Atomic(rewrap_rule_elem s
		       (Ast.Decl(convert_allminus_mcodekind allminus bef,
				 allminus,declaration decl)))
      | Ast0.Seq(lbrace,body,rbrace) ->
	  let lbrace = mcode lbrace in
	  let body = dots (statement seqible) body in
	  let rbrace = mcode rbrace in
	  Ast.Seq(iso_tokenwrap lbrace s (Ast.SeqStart(lbrace))
		    (do_isos (Ast0.get_iso s)),
		  body,
		  tokenwrap rbrace s (Ast.SeqEnd(rbrace)))
      | Ast0.ExprStatement(exp,sem) ->
	  Ast.Atomic(rewrap_rule_elem s
		       (Ast.ExprStatement(get_option expression exp,mcode sem)))
      | Ast0.IfThen(iff,lp,exp,rp,branch,(_,aft)) ->
	  Ast.IfThen
	    (rewrap_rule_elem s
	       (Ast.IfHeader(mcode iff,mcode lp,expression exp,mcode rp)),
	     statement Ast.NotSequencible branch,
	     ([],[],[],convert_mcodekind (-1) aft))
      | Ast0.IfThenElse(iff,lp,exp,rp,branch1,els,branch2,(_,aft)) ->
	  let els = mcode els in
	  Ast.IfThenElse
	    (rewrap_rule_elem s
	       (Ast.IfHeader(mcode iff,mcode lp,expression exp,mcode rp)),
	     statement Ast.NotSequencible branch1,
	     tokenwrap els s (Ast.Else(els)),
	     statement Ast.NotSequencible branch2,
	     ([],[],[],convert_mcodekind (-1) aft))
      | Ast0.While(wh,lp,exp,rp,body,(_,aft)) ->
	  Ast.While(rewrap_rule_elem s
		      (Ast.WhileHeader
			 (mcode wh,mcode lp,expression exp,mcode rp)),
		    statement Ast.NotSequencible body,
		    ([],[],[],convert_mcodekind (-1) aft))
      | Ast0.Do(d,body,wh,lp,exp,rp,sem) ->
	  let wh = mcode wh in
	  Ast.Do(rewrap_rule_elem s (Ast.DoHeader(mcode d)),
		 statement Ast.NotSequencible body,
		 tokenwrap wh s
		   (Ast.WhileTail(wh,mcode lp,expression exp,mcode rp,
				  mcode sem)))
      | Ast0.For(fr,lp,exp1,sem1,exp2,sem2,exp3,rp,body,(_,aft)) ->
	  let fr = mcode fr in
	  let lp = mcode lp in
	  let exp1 = get_option expression exp1 in
	  let sem1 = mcode sem1 in
	  let exp2 = get_option expression exp2 in
	  let sem2= mcode sem2 in
	  let exp3 = get_option expression exp3 in
	  let rp = mcode rp in
	  let body = statement Ast.NotSequencible body in
	  Ast.For(rewrap_rule_elem s
		    (Ast.ForHeader(fr,lp,exp1,sem1,exp2,sem2,exp3,rp)),
		  body,([],[],[],convert_mcodekind (-1) aft))
      | Ast0.Iterator(nm,lp,args,rp,body,(_,aft)) ->
	  Ast.Iterator(rewrap_rule_elem s
		      (Ast.IteratorHeader
			 (ident nm,mcode lp,
			  dots expression args,
			  mcode rp)),
		    statement Ast.NotSequencible body,
		    ([],[],[],convert_mcodekind (-1) aft))
      |	Ast0.Switch(switch,lp,exp,rp,lb,decls,cases,rb) ->
	  let switch = mcode switch in
	  let lp = mcode lp in
	  let exp = expression exp in
	  let rp = mcode rp in
	  let lb = mcode lb in
	  let decls = dots (statement seqible) decls in
	  let cases = List.map case_line (Ast0.undots cases) in
	  let rb = mcode rb in
	  Ast.Switch(rewrap_rule_elem s (Ast.SwitchHeader(switch,lp,exp,rp)),
		     tokenwrap lb s (Ast.SeqStart(lb)),
		     decls,cases,
		     tokenwrap rb s (Ast.SeqEnd(rb)))
      | Ast0.Break(br,sem) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Break(mcode br,mcode sem)))
      | Ast0.Continue(cont,sem) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Continue(mcode cont,mcode sem)))
      |	Ast0.Label(l,dd) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Label(ident l,mcode dd)))
      |	Ast0.Goto(goto,l,sem) ->
	  Ast.Atomic
	    (rewrap_rule_elem s (Ast.Goto(mcode goto,ident l,mcode sem)))
      | Ast0.Return(ret,sem) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Return(mcode ret,mcode sem)))
      | Ast0.ReturnExpr(ret,exp,sem) ->
	  Ast.Atomic
	    (rewrap_rule_elem s
	       (Ast.ReturnExpr(mcode ret,expression exp,mcode sem)))
      | Ast0.MetaStmt(name,_) ->
	  Ast.Atomic(rewrap_rule_elem s
		       (Ast.MetaStmt(mcode name,unitary,seqible,false)))
      | Ast0.MetaStmtList(name,_) ->
	  Ast.Atomic(rewrap_rule_elem s
		       (Ast.MetaStmtList(mcode name,unitary,false)))
      | Ast0.TopExp(exp) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.TopExp(expression exp)))
      | Ast0.Exp(exp) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Exp(expression exp)))
      | Ast0.TopInit(init) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.TopInit(initialiser init)))
      | Ast0.Ty(ty) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Ty(typeC ty)))
      | Ast0.Disj(_,rule_elem_dots_list,_,_) ->
	  Ast.Disj(List.map (function x -> statement_dots seqible x)
		     rule_elem_dots_list)
      | Ast0.Nest(starter,rule_elem_dots,ender,whn,multi) ->
	  Ast.Nest
	    (mcode starter,statement_dots Ast.Sequencible rule_elem_dots,
	     mcode ender,
	     List.map
	       (whencode (statement_dots Ast.Sequencible)
		 (statement Ast.NotSequencible))
	       whn,
	     multi,[],[])
      | Ast0.Dots(d,whn) ->
	  let d = mcode d in
	  let whn =
	    List.map
	      (whencode (statement_dots Ast.Sequencible)
		 (statement Ast.NotSequencible))
	      whn in
	  Ast.Dots(d,whn,[],[])
      | Ast0.Circles(d,whn) ->
	  let d = mcode d in
	  let whn =
	    List.map
	      (whencode (statement_dots Ast.Sequencible)
		 (statement Ast.NotSequencible))
	      whn in
	  Ast.Circles(d,whn,[],[])
      | Ast0.Stars(d,whn) ->
	  let d = mcode d in
	  let whn =
	    List.map
	      (whencode (statement_dots Ast.Sequencible)
		 (statement Ast.NotSequencible))
	      whn in
	  Ast.Stars(d,whn,[],[])
      | Ast0.FunDecl((_,bef),fi,name,lp,params,rp,lbrace,body,rbrace) ->
	  let fi = List.map fninfo fi in
	  let name = ident name in
	  let lp = mcode lp in
	  let params = parameter_list params in
	  let rp = mcode rp in
	  let lbrace = mcode lbrace in
	  let body = dots (statement seqible) body in
	  let rbrace = mcode rbrace in
	  let allminus = check_allminus.VT0.combiner_rec_statement s in
	  Ast.FunDecl(rewrap_rule_elem s
			(Ast.FunHeader
			   (convert_allminus_mcodekind allminus bef,
			    allminus,fi,name,lp,params,rp)),
		      tokenwrap lbrace s (Ast.SeqStart(lbrace)),
		      body,
		      tokenwrap rbrace s (Ast.SeqEnd(rbrace)))
      |	Ast0.Include(inc,str) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Include(mcode inc,mcode str)))
      |	Ast0.Undef(def,id) ->
	  Ast.Atomic(rewrap_rule_elem s (Ast.Undef(mcode def,ident id)))
      | Ast0.Define(def,id,params,body) ->
	  Ast.Define
	    (rewrap_rule_elem s
	       (Ast.DefineHeader
		  (mcode def,ident id, define_parameters params)),
	     statement_dots Ast.NotSequencible (*not sure*) body)
      | Ast0.OptStm(stm) -> Ast.OptStm(statement seqible stm)
      | Ast0.UniqueStm(stm) -> Ast.UniqueStm(statement seqible stm))

  and define_parameters p =
    rewrap p no_isos
      (match Ast0.unwrap p with
	Ast0.NoParams -> Ast.NoParams
      | Ast0.DParams(lp,params,rp) ->
	  Ast.DParams(mcode lp,
		      dots define_param params,
		      mcode rp))

  and define_param p =
    rewrap p no_isos
      (match Ast0.unwrap p with
	Ast0.DParam(id) -> Ast.DParam(ident id)
      | Ast0.DPComma(comma) -> Ast.DPComma(mcode comma)
      | Ast0.DPdots(d) -> Ast.DPdots(mcode d)
      | Ast0.DPcircles(c) -> Ast.DPcircles(mcode c)
      | Ast0.OptDParam(dp) -> Ast.OptDParam(define_param dp)
      | Ast0.UniqueDParam(dp) -> Ast.UniqueDParam(define_param dp))

  and whencode notfn alwaysfn = function
      Ast0.WhenNot a -> Ast.WhenNot (notfn a)
    | Ast0.WhenAlways a -> Ast.WhenAlways (alwaysfn a)
    | Ast0.WhenModifier(x) -> Ast.WhenModifier(x)
    | x ->
	let rewrap_rule_elem ast0 ast =
	  rewrap ast0 (do_isos (Ast0.get_iso ast0)) ast in
	match x with
	  Ast0.WhenNotTrue(e) ->
	    Ast.WhenNotTrue(rewrap_rule_elem e (Ast.Exp(expression e)))
	| Ast0.WhenNotFalse(e) ->
	    Ast.WhenNotFalse(rewrap_rule_elem e (Ast.Exp(expression e)))
	| _ -> failwith "not possible"

  and process_list seqible isos = function
      [] -> []
    | x::rest ->
	let first = statement seqible x in
	let first =
	  if !Flag.track_iso_usage
	  then Ast.set_isos first (isos@(Ast.get_isos first))
	  else first in
	(match Ast0.unwrap x with
	  Ast0.Dots(_,_) | Ast0.Nest(_) ->
	    first::(process_list (Ast.SequencibleAfterDots []) no_isos rest)
	| _ ->
	    first::(process_list Ast.Sequencible no_isos rest))

  and statement_dots seqible d =
    let isos = do_isos (Ast0.get_iso d) in
    rewrap d no_isos
      (match Ast0.unwrap d with
	Ast0.DOTS(x) -> Ast.DOTS(process_list seqible isos x)
      | Ast0.CIRCLES(x) -> Ast.CIRCLES(process_list seqible isos x)
      | Ast0.STARS(x) -> Ast.STARS(process_list seqible isos x))

  (* the following is no longer used.
   the goal was to let one put a statement at the very beginning of a function
   pattern and have it skip over the declarations in the C code.
   that feature was removed a long time ago, however, in favor of
   ... when != S, which also causes whatever comes after it to match the
   first real statement.
   the separation of declarations from the rest of the body means that the
   quantifier of any variable shared between them comes out too high, posing
   problems when there is ... decl ... stmt, as the quantifier of any shared
   variable will be around the whole thing, making variables not free enough
   in the first ..., and thus not implementing the expected shortest path
   condition.  example: f() { ... int A; ... foo(A); }.
   the quantifier for A should start just before int A, not at the top of the
   function.
  and separate_decls seqible d =
    let rec collect_decls = function
	[] -> ([],[])
      | (x::xs) as l ->
	  (match Ast0.unwrap x with
	    Ast0.Decl(_) ->
	      let (decls,other) = collect_decls xs in
	      (x :: decls,other)
	  | Ast0.Dots(_,_) | Ast0.Nest(_,_,_,_,_) ->
	      let (decls,other) = collect_decls xs in
	      (match decls with
		[] -> ([],x::other)
	      | _ -> (x :: decls,other))
	  | Ast0.Disj(starter,stmt_dots_list,mids,ender) ->
	      let disjs = List.map collect_dot_decls stmt_dots_list in
	      let all_decls = List.for_all (function (_,s) -> s=[]) disjs in
	      if all_decls
	      then
		let (decls,other) = collect_decls xs in
		(x :: decls,other)
	      else ([],l)
	  | _ -> ([],l))

    and collect_dot_decls d =
      match Ast0.unwrap d with
	Ast0.DOTS(x) -> collect_decls x
      | Ast0.CIRCLES(x) -> collect_decls x
      | Ast0.STARS(x) -> collect_decls x in

    let process l d fn =
      let (decls,other) = collect_decls l in
      (rewrap d no_isos (fn (List.map (statement seqible) decls)),
       rewrap d no_isos
	 (fn (process_list seqible (do_isos (Ast0.get_iso d)) other))) in
    match Ast0.unwrap d with
      Ast0.DOTS(x) -> process x d (function x -> Ast.DOTS x)
    | Ast0.CIRCLES(x) -> process x d (function x -> Ast.CIRCLES x)
    | Ast0.STARS(x) -> process x d (function x -> Ast.STARS x) *) in

  statement Ast.Sequencible s

and fninfo = function
    Ast0.FStorage(stg) -> Ast.FStorage(mcode stg)
  | Ast0.FType(ty) -> Ast.FType(typeC ty)
  | Ast0.FInline(inline) -> Ast.FInline(mcode inline)
  | Ast0.FAttr(attr) -> Ast.FAttr(mcode attr)

and option_to_list = function
    Some x -> [x]
  | None -> []

and case_line c =
  rewrap c no_isos
    (match Ast0.unwrap c with
      Ast0.Default(def,colon,code) ->
	let def = mcode def in
	let colon = mcode colon in
	let code = dots statement code in
	Ast.CaseLine(rewrap c no_isos (Ast.Default(def,colon)),code)
    | Ast0.Case(case,exp,colon,code) ->
	let case = mcode case in
	let exp = expression exp in
	let colon = mcode colon in
	let code = dots statement code in
	Ast.CaseLine(rewrap c no_isos (Ast.Case(case,exp,colon)),code)
    | Ast0.DisjCase(_,case_lines,_,_) ->
	failwith "not supported"
	(*Ast.CaseLine(Ast.DisjRuleElem(List.map case_line case_lines))*)

    | Ast0.OptCase(case) -> Ast.OptCase(case_line case))

and statement_dots l = dots statement l

(* --------------------------------------------------------------------- *)

(* what is possible is only what is at the top level in an iso *)
and anything = function
    Ast0.DotsExprTag(d) -> Ast.ExprDotsTag(expression_dots d)
  | Ast0.DotsParamTag(d) -> Ast.ParamDotsTag(parameter_list d)
  | Ast0.DotsInitTag(d) -> failwith "not possible"
  | Ast0.DotsStmtTag(d) -> Ast.StmtDotsTag(statement_dots d)
  | Ast0.DotsDeclTag(d) -> Ast.DeclDotsTag(declaration_dots d)
  | Ast0.DotsCaseTag(d) -> failwith "not possible"
  | Ast0.IdentTag(d) -> Ast.IdentTag(ident d)
  | Ast0.ExprTag(d) -> Ast.ExpressionTag(expression d)
  | Ast0.ArgExprTag(d) | Ast0.TestExprTag(d) ->
     failwith "only in isos, not converted to ast"
  | Ast0.TypeCTag(d) -> Ast.FullTypeTag(typeC d)
  | Ast0.ParamTag(d) -> Ast.ParamTag(parameterTypeDef d)
  | Ast0.InitTag(d) -> Ast.InitTag(initialiser d)
  | Ast0.DeclTag(d) -> Ast.DeclarationTag(declaration d)
  | Ast0.StmtTag(d) -> Ast.StatementTag(statement d)
  | Ast0.CaseLineTag(d) -> Ast.CaseLineTag(case_line d)
  | Ast0.TopTag(d) -> Ast.Code(top_level d)
  | Ast0.IsoWhenTag(_) -> failwith "not possible"
  | Ast0.IsoWhenTTag(_) -> failwith "not possible"
  | Ast0.IsoWhenFTag(_) -> failwith "not possible"
  | Ast0.MetaPosTag _ -> failwith "not possible"

(* --------------------------------------------------------------------- *)
(* Function declaration *)
(* top level isos are probably lost to tracking *)

and top_level t =
  rewrap t no_isos
    (match Ast0.unwrap t with
      Ast0.FILEINFO(old_file,new_file) ->
	Ast.FILEINFO(mcode old_file,mcode new_file)
    | Ast0.NONDECL(stmt) -> Ast.NONDECL(statement stmt)
    | Ast0.CODE(rule_elem_dots) -> Ast.CODE(statement_dots rule_elem_dots)
    | Ast0.ERRORWORDS(exps) -> Ast.ERRORWORDS(List.map expression exps)
    | Ast0.OTHER(_) | Ast0.TOPCODE(_) -> failwith "eliminated by top_level")

(* --------------------------------------------------------------------- *)
(* Entry point for minus code *)

(* Inline_mcodes is very important - sends + code attached to the - code
down to the mcodes.  The functions above can only be used when there is no
attached + code, eg in + code itself. *)
let ast0toast_toplevel x =
  inline_mcodes.VT0.combiner_rec_top_level x;
  top_level x

let ast0toast name deps dropped exists x is_exp ruletype =
  List.iter inline_mcodes.VT0.combiner_rec_top_level x;
  Ast.CocciRule
    (name,(deps,dropped,exists),List.map top_level x,is_exp,ruletype)