68 lines
2.0 KiB
OCaml
68 lines
2.0 KiB
OCaml
open Camlp4.PreCast;;
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let foldr_funs = ref [];;
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let foldl_funs = ref [];;
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AstFilters.register_str_item_filter begin
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Ast.map_expr begin function
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| <:expr@loc< def_foldr $lid:name$ $e$ >> ->
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foldr_funs := (name, e) :: !foldr_funs; <:expr@loc<()>>
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| <:expr@loc< def_foldl $lid:name$ $e$ >> ->
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foldl_funs := (name, e) :: !foldl_funs; <:expr@loc<()>>
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| e -> e
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end
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end#str_item;;
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AstFilters.register_str_item_filter begin
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Ast.map_expr begin function
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| <:expr@loc< $lid:name$($tup:e$) >> when List.mem_assoc name !foldl_funs ->
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let op = List.assoc name !foldl_funs in
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let rec foldl =
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function
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| [] -> assert false
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| [x] -> x
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| x :: xs -> <:expr@loc< $op$ $foldl xs$ $x$ >>
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in foldl (List.rev (Ast.list_of_expr e []))
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| <:expr@loc< $lid:name$($tup:e$) >> when List.mem_assoc name !foldr_funs ->
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let op = List.assoc name !foldr_funs in
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let rec foldr =
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function
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| [] -> assert false
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| [x] -> x
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| x :: xs -> <:expr@loc< $op$ $x$ $foldr xs$ >>
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in foldr (Ast.list_of_expr e [])
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| e -> e
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end
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end#str_item;;
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(*
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AstFilters.register_str_item_filter begin
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Ast.map_expr begin function
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| <:expr@loc< foldl($lid:op$, $e$) >> ->
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let rec foldl =
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function
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| [] -> assert false
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| [x] -> x
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| x :: xs -> <:expr@loc< $lid:op$ $foldl xs$ $x$ >>
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in foldl (List.rev (Ast.list_of_expr e []))
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| <:expr@loc< foldr($lid:op$, $e$) >> ->
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let rec foldr =
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function
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| [] -> assert false
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| [x] -> x
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| x :: xs -> <:expr@loc< $lid:op$ $x$ $foldr xs$ >>
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in foldr (Ast.list_of_expr e [])
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| e -> e
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end
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end#str_item;;
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AstFilters.register_str_item_filter begin
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Ast.map_expr begin function
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| <:expr@loc< \!+ ($tup:e$) >> ->
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begin match Ast.list_of_expr e [] with
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| [] | [_] -> assert false
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| x :: xs -> List.fold_left (fun acc x -> <:expr@loc< $acc$ + $x$ >>) x xs
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end
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| <:expr< \!+ $e$ >> -> e
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| e -> e
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end
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end#str_item;;
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*)
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