# publicMLstate/opalang

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278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 `open SurfaceAstlet identity = Base.identitymodule Fixpoint =struct  (* used for removing nodes *)  let rec repeat f e =    let e' = f e in    if e == e' then e' else repeat f e'  (* could avoid some comparisons by saying * let rec repeats fs e_o = * let rec aux ... = * match ... with * | [] -> it e == e_0 then e else repeats fs e *)  let repeats fs e =    let rec aux e l did_something =      match l with        | [] -> if did_something then init e else e        | h :: t ->          let e' = repeat h e in          aux e' t (did_something || e != e')    and init e = aux e fs false in    init e  (* used for removing nodes and getting the context *)  let rec repeat' f (e,recombiner) =    let e', recombiner' = f e in    let recombiner'' = if recombiner' == identity then recombiner else fun e -> recombiner (recombiner' e) in    if e == e' then      e, recombiner''    else      repeat' f (e',recombiner'')  let repeats' fs e =    let rec aux e l did_something =      match l with        | [] -> if did_something then init e else e        | h :: t ->          let e' = repeat' h e in          aux e' t (did_something || fst e != fst e')    and init e = aux e fs false in    init eendmodule Remove =struct  type ('a,'b) through = ('a, 'b) expr -> ('a, 'b) expr  let fail label = failwith (Printf.sprintf "SurfaceAstDecons.Remove.fail: %s" (FilePos.to_string label.QmlLoc.pos))  module Basic =  struct    let access_directive = function      | (Directive (#access_directive,[e],_),_) -> e      | (Directive (#access_directive,_,_),_) -> assert false      | e -> e    let access_not_public = function      | (Directive (`public,_,_),_) as e -> e      | (Directive (#access_directive,[e],_),_) -> e      | (Directive (#access_directive,_,_),_) -> assert false      | e -> e    let async = function      | (Directive (`async, [e], _),_) -> e      | (Directive (`async, _, _),_) -> assert false      | e -> e    let binding_directive = function      | (Directive (#binding_directive, [e], _),_) -> e      | (Directive (#binding_directive, _, _),_) -> assert false      | e -> e    let coerce = function      | (Directive (`coerce,[e],_),_) -> e      | (Directive (`coerce,_,_),_) -> assert false      | e -> e    let deprecated = function      | Directive (`deprecated, [ _ ; e ], _), _ -> e      | Directive (`deprecated, _, _), _ -> assert false      | e -> e    let directive = function      | (Directive (_,[e],_),_) -> e      | e -> e    let doctype = function      | (Directive (`doctype _,[e],_),_) -> e      | (Directive (`doctype _,_,_),_) -> assert false      | e -> e    let expand = function      | (Directive (`expand _, [e], _), _) -> e      | (Directive (`expand _, _, _), _) -> assert false      | e -> e    let magic_directive = function      | Directive (`specialize _, e::_, _), _ -> e      | Directive (#magic_directive, [e], _), _ -> e      | Directive (#magic_directive, _, _), _ -> assert false      | e -> e    let lambda = function      | (Lambda (_,e),_) -> e      | e -> e    let letin = function      | (LetIn (_,_,e),_) -> e      | e -> e    let opacapi = function      | (Directive (`opacapi, [e], _), _) -> e      | (Directive (`opacapi, _, _),_) -> assert false      | e -> e    let opavalue_directive = function      | (Directive (#opavalue_directive, [e], _), _) -> e      | (Directive (#opavalue_directive, _, _),_) -> assert false      | e -> e    let open_ = function      | (Directive (`open_, [_;e], _),_) -> e      | (Directive (`open_, _, _),_) -> assert false      | e -> e    let private_ = function      | (Directive (`private_, [e], _),_) -> e      | (Directive (`private_, _, _),_) -> assert false      | e -> e    let slicer_directive = function      | (Directive (#distribution_directive,[e],_),_) -> e      | (Directive (#distribution_directive,_,_),_) -> assert false      | e -> e    let side_annotation = function      | (Directive (`side_annotation _,[e],_),_) -> e      | (Directive (`side_annotation _,_,_),_) -> assert false      | e -> e    let visibility_annotation = function      | (Directive (`visibility_annotation _,[e],_),_) -> e      | (Directive (`visibility_annotation _,_,_),_) -> assert false      | e -> e  end  let remove ~through e = Fixpoint.repeats through e  let coerce e = Fixpoint.repeat Basic.coerce e  (* with conjunctive types, this could be well typed * but then you would need `coerce None; `wrap None *)  (* let rec translate = function | `coerce -> [Basic.coerce] and translates v = List.concat_map translate v let general ~through e = let through = translates through in Fixpoint.repeats ~through e *)endmodule Look =struct  type ('a,'b) through = ('a,'b) Remove.through  let default_removals = []  let apply ?(through=default_removals) e =    match Fixpoint.repeats through e with      | (Apply _,_) -> true      | _ -> false  let lambda ?(through=default_removals) e =    match Fixpoint.repeats through e with    | (Lambda _,_) -> true    | _ -> false  let module_ ?(through=default_removals) e =    match Fixpoint.repeats through e with    | (Directive (`module_,_,_),_) -> true    | _ -> false  let private_ ?(through=default_removals) e =    match Fixpoint.repeats through e with    | (Directive (`private_,_,_),_) -> true    | _ -> false  let record ?(through=default_removals) e =    match Fixpoint.repeats through e with    | (Record _,_) -> true    | _ -> false  (* assume that the module has local directive, not that it is a local module *)  let module_local ?(through=default_removals) e =    match Fixpoint.repeats through e with      | (Directive (`module_,[(Record ((_,(Directive (`local _,_,_),_))::_),_)],_),_) -> true      | _ -> false  let at ?(through=default_removals) ~at e =    let e = Fixpoint.repeats through e in    let e' = Fixpoint.repeats at e in    e != e'endmodule Context =struct  type ('a,'b,'c) through_with_context = ('a,'b) expr -> ('a, 'b) expr * (('a, 'c) expr -> ('a, 'c) expr)  (* put them in alphabetical order *)  module Basic =  struct    let coerce = function      | (Directive (`coerce,[e],b),c) -> e, (fun e -> (Directive (`coerce,[e],b),c))      | (Directive (`coerce,_,_),_) -> assert false      | e -> e, identity    let directive = function      | (Directive (a,[e],c),d) -> e, (fun e -> (Directive (a,[e],c),d))      | e -> e, identity    let lambda = function      | (Lambda (a,e),b) -> e, (fun e -> (Lambda (a,e),b))      | e -> e, identity    let letin = function      | (LetIn (rec_,a,e),b) -> e, (fun e -> (LetIn (rec_,a,e),b))      | e -> e, identity    let opavalue_directive = function      | (Directive (#opavalue_directive as v,[e],b),c) ->          e, (fun e -> (Directive (v,[e],b),c))      | (Directive (#opavalue_directive,_,_),_) -> assert false      | e -> e, identity    let opacapi = function      | (Directive (`opacapi,[e],c),d) -> e, (fun e -> (Directive (`opacapi,[e],c),d))      | (Directive (`opacapi, _, _),_) -> assert false      | e -> e, identity    let open_ = function      | (Directive (`open_,[b;e],c),d) -> e, (fun e -> (Directive (`open_,[b;e],c),d))      | (Directive (`open_, _, _),_) -> assert false      | e -> e, identity    let doctype = function      | (Directive (`doctype arg,[e],b),c) -> e, (fun e -> (Directive (`doctype arg,[e],b),c))      | (Directive (`doctype _,_,_),_) -> assert false      | e -> e, identity    let slicer_directive = function      | (Directive (#distribution_directive as v,[e],b),c) ->          e, (fun e -> (Directive (v,[e],b),c))      | (Directive (#distribution_directive,_,_),_) -> assert false      | e -> e, identity    let binding_directive = function      | (Directive (#binding_directive as v,[e],b),c) ->          e, (fun e -> (Directive (v,[e],b),c))      | (Directive (#binding_directive,_,_),_) -> assert false      | e -> e, identity    let side_annotation = function      | (Directive (`side_annotation _ as v,[e],b),c) ->          e, (fun e -> (Directive (v,[e],b),c))      | (Directive (`side_annotation _,_,_),_) -> assert false      | e -> e, identity    let visibility_annotation = function      | (Directive (`visibility_annotation _ as v,[e],b),c) ->          e, (fun e -> (Directive (v,[e],b),c))      | (Directive (`visibility_annotation _,_,_),_) -> assert false      | e -> e, identity  end  let remove ~through e = Fixpoint.repeats' (through : (_,_,_) through_with_context list) (e,identity)  let filter      ~(keep:('a, 'b, 'c) through_with_context list)      ~(throw:('a, 'b) Remove.through list) e      : ('a, 'b) SurfaceAst.expr * (('a, 'c) SurfaceAst.expr -> ('a, 'c) SurfaceAst.expr) =    let rec aux acc e =      let e' = Fixpoint.repeats throw e in      let e'',acc = Fixpoint.repeats' keep (e',acc) in      if e == e'' then        e, acc      else        aux acc e'' in    aux identity e  let filter2 ~keep1 ~keep2 ~throw e =    let rec aux acc1 acc2 e =      let e' = Fixpoint.repeats throw e in      let e'',acc1 = Fixpoint.repeats' keep1 (e',acc1) in      let e''',acc2 = Fixpoint.repeats' keep2 (e'',acc2) in      if e == e''' then        e, acc1, acc2      else        aux acc1 acc2 e''' in    aux identity identity e  let uncoerce e = Fixpoint.repeat' Basic.coerce (e,identity)  let unletin e = Fixpoint.repeat' Basic.letin (e,identity)endmodule FoldThrough =struct  (* faire une contrepartie dans surfaceAstCons *)  let default_removals = Look.default_removals  let dot ?(through=default_removals) e =    let rec aux acc e =      match Fixpoint.repeats through e with        | (Dot (e,s),lab) -> aux ((s,lab)::acc) e        | e -> e, acc in    aux [] e  let arity ?(through=default_removals) e =    match Fixpoint.repeats through e with      | (Lambda (r,_),_) -> Some (List.length r)      | _ -> None  let fields ?(through=default_removals) e =    match Fixpoint.repeats through e with      | (Record r,_)      | (Directive (`module_, [(Record r, _)], _),_) -> Some r      | _ -> Noneendmodule FoldContext =struct  let default_removals = Look.default_removals  let letin ?(through=default_removals) e =    let rec aux acc e =      match Fixpoint.repeats' through e with        (* BEWARE: dropping the rec_ flag *)        | ((LetIn (_,bindings,e),_),recombiner) -> aux (List.rev_append bindings acc) (e,recombiner)        | (e,recombiner) -> e, acc, recombiner in    aux [] (e,identity)end`
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