package email_message
E-mail message parser
Install
Dune Dependency
Authors
Maintainers
Sources
v0.17.0.tar.gz
sha256=3aa5c85da8530c277cf9e72e18861b235b3b872f08c87f118c04478433320ebb
doc/src/email_message.kernel/headers.ml.html
Source file headers.ml
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module Stable = struct open Core.Core_stable module Name = struct module V1 = struct type t = string [@@deriving bin_io, compare, hash, sexp, equal] end end module Value = struct module V1 = struct type t = string [@@deriving bin_io, compare, hash, sexp] end end module V1 = struct type t = (Name.V1.t * string) list [@@deriving bin_io, compare, hash, sexp, equal] end end open Core module Normalize = struct type encode = [ `None (* Leave whitespace unchanged *) | `Whitespace (* Cleanup leading and trailing whitespace on each line *) ] [@@deriving sexp_of] type decode = [ encode | `Whitespace_and_encoded_words ] [@@deriving sexp_of] let default : [> `Whitespace ] = `Whitespace end module Name : sig type t = string [@@deriving sexp_of, compare, hash, equal] val of_string : string -> t val to_string : t -> string include Comparable.S_plain with type t := t include Hashable.S_plain with type t := t val is : t -> string -> bool end = struct include Mimestring.Case_insensitive let to_string str = str let is = equal_string end module Value : sig type t = string [@@deriving sexp_of, compare, hash] val of_string : ?normalize:Normalize.decode -> string -> t val to_string : ?normalize:Normalize.encode -> t -> string val to_string' : ?normalize:Normalize.decode -> t -> string include Comparable.S_plain with type t := t include Hashable.S_plain with type t := t end = struct include String let normalize_string str = (* From the RFC (https://datatracker.ietf.org/doc/html/rfc822#section-3.1.1), newlines followed by whitespace should be replace by just the whitespace character. Stripping the lines isn't quite obeying the standard but matches what we've done historically and some emails probably have excessive whitespace. *) String.split_lines str |> List.map ~f:String.strip |> String.concat ~sep:" " ;; let of_string ?(normalize = Normalize.default) str = match normalize with | `None -> str | `Whitespace -> normalize_string str | `Whitespace_and_encoded_words -> let normalized = normalize_string str in (match Encoded_word.decode normalized with | Ok str -> str | Error _ -> normalized) ;; let to_string ?(normalize = Normalize.default) str = match normalize with | `None -> str | `Whitespace -> " " ^ (String.split_lines str |> List.map ~f:String.strip |> String.concat ~sep:"\n ") ;; let to_string' ?(normalize = Normalize.default) str = match normalize with | #Normalize.encode as normalize -> to_string ~normalize str | `Whitespace_and_encoded_words -> to_string ~normalize:`Whitespace str ;; end module Common = struct let subject = "Subject" let to_ = "To" let cc = "Cc" let bcc = "Bcc" let from = "From" let date = "Date" let message_id = "Message-ID" let list_id = "list-Id" end type t = (Name.t * string) list [@@deriving sexp_of, compare, hash, equal] let to_string_monoid ?(eol = `LF) t = List.map t ~f:(fun (name, value) -> String_monoid.concat_string [ (name :> string); ":"; value; Lf_or_crlf.to_string eol ]) |> String_monoid.concat ;; let to_string ?eol t = String_monoid.to_string (to_string_monoid ?eol t) let empty = [] let append = List.append (* Accessors *) let last ?normalize t name = let name = Name.of_string name in List.fold t ~init:None ~f:(fun r (k, v) -> if Name.equal name k then Some v else r) |> Option.map ~f:(Value.of_string ?normalize) ;; let any ?normalize t name = let name = Name.of_string name in List.Assoc.find t name ~equal:Name.equal |> Option.map ~f:(Value.of_string ?normalize) ;; let find_all ?normalize t name = let name = Name.of_string name in List.filter_map t ~f:(fun (name', value) -> if Name.equal name name' then Some (Value.of_string ?normalize value) else None) ;; (* Modify *) let of_list ~normalize : _ -> t = List.map ~f:(fun (name, value) -> let name = Name.of_string name in let value = Value.to_string ~normalize value in name, value) ;; let to_list ?normalize : t -> _ = List.map ~f:(fun (name, value) -> name, Value.of_string ?normalize value) ;; let add ?normalize t ~name ~value = let name = Name.of_string name in let value = Value.to_string ?normalize value in let rec add acc = function | (name', _) :: _ as fields when Name.equal name name' -> List.rev acc @ [ name, value ] @ fields | field :: fields -> add (field :: acc) fields | [] -> (name, value) :: t in add [] t ;; let add_if_missing ?normalize t ~name ~value = if List.Assoc.mem t ~equal:Name.equal name then t else add ?normalize t ~name ~value ;; let set ?normalize t ~name ~value = let name = Name.of_string name in let value = Value.to_string ?normalize value in let rec set acc = function | (name', _) :: fields when Name.equal name name' -> List.rev acc @ [ name, value ] @ fields | field :: fields -> set (field :: acc) fields | [] -> (name, value) :: t in set [] t ;; let add_at_bottom ?normalize t ~name ~value = List.rev (add ?normalize (List.rev t) ~name ~value) ;; let add_at_bottom_if_missing ?normalize t ~name ~value = if List.Assoc.mem t ~equal:Name.equal name then t else add_at_bottom ?normalize t ~name ~value ;; let set_at_bottom ?normalize t ~name ~value = List.rev (set ?normalize (List.rev t) ~name ~value) ;; let add_all ?normalize t ts : t = List.fold ~init:t ~f:(fun t (name, value) -> add ?normalize t ~name ~value) (List.rev ts) ;; let add_all_at_bottom ?normalize t ts = List.fold ~init:t ~f:(fun t (name, value) -> add_at_bottom ?normalize t ~name ~value) ts ;; let filter ?normalize t ~f = List.filter t ~f:(fun (name, value) -> f ~name ~value:(Value.of_string ?normalize value)) ;; let map' ?normalize t ~f = List.map t ~f:(fun ((name : Name.t), (value_raw : string)) -> let value = Value.of_string ?normalize value_raw in let name', value' = f ~name ~value in let value = if String.equal (value :> string) value' then value_raw else Value.to_string' ?normalize value' in name', value) ;; let map ?normalize t ~f = map' ?normalize t ~f:(fun ~name ~value -> name, f ~name ~value) let smash_and_add ?normalize t ~name ~value = let values = find_all ?normalize:((normalize : Normalize.encode option) :> Normalize.decode option) t name in let t = filter t ~f:(fun ~name:name' ~value:_ -> Name.(name <> name')) in let value = String.concat (values @ [ value ]) ~sep:", " in add_at_bottom ?normalize t ~name ~value ;; let names = List.map ~f:fst let%test_module _ = (module struct let t = of_list ~normalize:`None [ "A", "a1"; "B", "b1"; "B", "b2" ] let%test_unit _ = [%test_result: string] (to_string t) ~expect:"A:a1\nB:b1\nB:b2\n" let%test_unit _ = [%test_result: string] (add ~normalize:`None t ~name:"B" ~value:"b3" |> to_string) ~expect:"A:a1\nB:b3\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (add ~normalize:`None t ~name:"B" ~value:"b3\nb3" |> to_string) ~expect:"A:a1\nB:b3\nb3\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (add t ~name:"B" ~value:"b3" |> to_string) ~expect:"A:a1\nB: b3\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (add t ~name:"B" ~value:"b3\nb3" |> to_string) ~expect:"A:a1\nB: b3\n b3\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (add ~normalize:`None t ~name:"C" ~value:"c1" |> to_string) ~expect:"C:c1\nA:a1\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (set ~normalize:`None t ~name:"B" ~value:"b3" |> to_string) ~expect:"A:a1\nB:b3\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (set ~normalize:`None t ~name:"b" ~value:"b3" |> to_string) ~expect:"A:a1\nb:b3\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (set ~normalize:`None t ~name:"C" ~value:"c1" |> to_string) ~expect:"C:c1\nA:a1\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (set ~normalize:`None t ~name:"c" ~value:"c1" |> to_string) ~expect:"c:c1\nA:a1\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (add_at_bottom ~normalize:`None t ~name:"A" ~value:"a2" |> to_string) ~expect:"A:a1\nA:a2\nB:b1\nB:b2\n" ;; let%test_unit _ = [%test_result: string] (add_at_bottom ~normalize:`None t ~name:"B" ~value:"b3" |> to_string) ~expect:"A:a1\nB:b1\nB:b2\nB:b3\n" ;; let%test_unit _ = [%test_result: string] (add_at_bottom ~normalize:`None t ~name:"C" ~value:"c1" |> to_string) ~expect:"A:a1\nB:b1\nB:b2\nC:c1\n" ;; let%test_unit _ = [%test_result: string] (set_at_bottom ~normalize:`None t ~name:"B" ~value:"b3" |> to_string) ~expect:"A:a1\nB:b1\nB:b3\n" ;; let%test_unit _ = [%test_result: string] (set_at_bottom ~normalize:`None t ~name:"C" ~value:"c1" |> to_string) ~expect:"A:a1\nB:b1\nB:b2\nC:c1\n" ;; end) ;;
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