36 lines
1.2 KiB
OCaml
36 lines
1.2 KiB
OCaml
open Ppxlib
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let extend_list_by name = object
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inherit Ast_traverse.map as super
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method! expression e =
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match e.pexp_desc with
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| Pexp_construct ({txt = Lident "[]"; _}, None) -> Ast_builder.Default.elist ~loc:e.pexp_loc [Ast_builder.Default.estring ~loc:e.pexp_loc name]
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| _ -> super#expression e
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end
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[%%expect{|
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val extend_list_by : string -> Ast_traverse.map = <fun>
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|}]
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let () =
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let name = "a: instr pos=Before" in
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let transform = extend_list_by name in
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Driver.(register_transformation ~instrument:(Instrument.make ~position:Before transform#structure) name)
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let () =
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let name = "b: instr pos=After" in
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let transform = extend_list_by name in
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Driver.(register_transformation ~instrument:(Instrument.make ~position:After transform#structure) name)
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let () =
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let name = "c: impl" in
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let transform = extend_list_by name in
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Driver.register_transformation ~impl:transform#structure name
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(* The order of the list should only depend on how the rewriters got registered,
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not on the alphabetic order of the names they got registered with. *)
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let x = []
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[%%expect{|
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val x : string list =
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["a: instr pos=Before"; "c: impl"; "b: instr pos=After"]
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|}]
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