Source file String_util.ml

let index_of_first_ascii_char word =
  let rx = Str.regexp "\\([A-za-z]\\)" in
  try Option.some @@ Str.search_forward rx word 0 with _ -> None

let title_case_word ix word =
  if ix = 0 then
    begin
      match index_of_first_ascii_char word with
      | None -> word
      | Some i ->
        word |> String.mapi @@ fun j c ->
        if i = j then Char.uppercase_ascii c else c
    end
  else
    word

let sentence_case str =
  let words = String.split_on_char ' ' str in
  String.concat " " @@ List.mapi title_case_word words

let trim_newlines str =
  let rec process_lines lines =
    match lines with
    | [] -> []
    | "" :: lines -> process_lines lines
    | _ -> lines
  in

  let lines = String.split_on_char '\n' str in
  String.concat "\n" @@ List.rev @@ process_lines @@ List.rev @@ process_lines lines

let trim_trailing_whitespace str =
  let rec process_chars rstr =
    match rstr with
    | '\n' :: rstr -> process_chars rstr
    | ' ' :: rstr -> process_chars rstr
    | '\t' :: rstr -> process_chars rstr
    | _ -> List.rev rstr
  in
  let n = String.length str in
  let chars = List.rev @@ List.init n (String.get str) in
  String.of_seq @@ List.to_seq @@ process_chars @@ chars