package core_extended
Extra components that are not as closely vetted or as stable as Core
Install
Dune Dependency
Authors
Maintainers
Sources
core_extended-v0.14.0.tar.gz
sha256=a7bf672f617891b10e405f1edb1c2ddc1db9e5b3169bd278bbb75b84d57d23ce
md5=00eb9b3ed6b0b02f74a2cf01e4d5827f
doc/src/core_extended.delimited_kernel/read.ml.html
Source file read.ml
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open Core_kernel open! Int.Replace_polymorphic_compare exception Bad_csv_formatting = Parse_state.Bad_csv_formatting module On_invalid_row = struct type 'a t = int String.Map.t -> string Append_only_buffer.t -> exn -> [ `Skip | `Yield of 'a | `Raise of exn ] let raise _ _ exn = `Raise exn let skip _ _ _ = `Skip let create = Fn.id end module Header = Header module Builder = struct type _ t = | Column : int -> string t | Header : string -> string t | Header_opt : string -> string option t | Return : 'a -> 'a t | Apply : ('b -> 'a) t * 'b t -> 'a t | Map : ('b -> 'a) * 'b t -> 'a t | Map2 : ('b -> 'c -> 'a) * 'b t * 'c t -> 'a t | Both : 'a t * 'b t -> ('a * 'b) t | Lambda : (int String.Map.t -> string Append_only_buffer.t -> 'a) -> 'a t module T = struct let return x = Return x let apply f x = match f with | Return f -> Map (f, x) | Map (f, w) -> Map2 (f, w, x) | _ -> Apply (f, x) ;; let map x ~f = match x with | Return x -> Return (f x) | _ -> Map (f, x) ;; let ( >>| ) t f = map t ~f let map2 x y ~f = match x, y with | Return x, Return y -> Return (f x y) | _ -> Map2 (f, x, y) ;; let map3 x y z ~f = match x, y, z with | Return x, Return y, Return z -> Return (f x y z) | _ -> Apply (Map2 (f, x, y), z) ;; let all ts = List.fold_right ts ~init:(return []) ~f:(map2 ~f:(fun x xs -> x :: xs)) let all_unit ts = map ~f:ignore (all ts) let both x y = Both (x, y) let ( <*> ) = apply let ( *> ) u v = return (fun () y -> y) <*> u <*> v let ( <* ) u v = return (fun x () -> x) <*> u <*> v module Applicative_infix = struct let ( <*> ) = ( <*> ) let ( *> ) = ( *> ) let ( <* ) = ( <* ) let ( >>| ) = ( >>| ) end end include T let at_index i ~f = Map (f, Column i) let at_header h ~f = Map (f, Header h) let at_header_opt h ~f = Map (f, Header_opt h) let lambda f = Lambda f module Open_on_rhs_intf = struct module type S = Read_intf.Open_on_rhs with type 'a t := 'a t end module Let_syntax = struct include T include Applicative_infix module Let_syntax = struct include T module Open_on_rhs = struct let at_index = at_index let at_header = at_header let at_header_opt = at_header_opt end end end module Without_headers = struct type 'a t = | Column : int -> string t | Return : 'a -> 'a t | Apply : ('b -> 'a) t * 'b t -> 'a t | Map : ('b -> 'a) * 'b t -> 'a t | Map2 : ('b -> 'c -> 'a) * 'b t * 'c t -> 'a t | Both : ('a t * 'b t) -> ('a * 'b) t | Lambda : (int String.Map.t -> string Append_only_buffer.t -> 'a) * int String.Map.t -> 'a t let get_fields_used t = let open Option.Let_syntax in let rec fields : type a. a t -> Int.Set.t option = function | Return _ -> Some Int.Set.empty | Column i -> Some (Int.Set.singleton i) | Apply (f, x) -> let%bind f = fields f in let%map x = fields x in Set.union f x | Map (_, x) -> fields x | Map2 (_, x, y) -> let%bind x = fields x in let%map y = fields y in Set.union x y | Both (x, y) -> let%bind x = fields x in let%map y = fields y in Set.union x y | Lambda _ -> None in fields t ;; let build t = let rec build' : type a. a t -> string Append_only_buffer.t -> a = fun t row -> match t with | Return x -> x | Column i -> Append_only_buffer.nth_exn row i | Apply (f, x) -> (build' f row) (build' x row) | Map (f, x) -> f (build' x row) | Map2 (f, x, y) -> f (build' x row) (build' y row) | Both (x, y) -> build' x row, build' y row | Lambda (f, header_map) -> f header_map row in let fields_used = get_fields_used t in match fields_used with | None -> build' t, None | Some fields_used -> let fields_used = Set.to_list fields_used in let mapping = List.mapi fields_used ~f:(fun i field_index -> field_index, i) |> Int.Map.of_alist_exn in let rec remap : type a. a t -> a t = fun t -> match t with | Column i -> Column (Map.find_exn mapping i) | Return x -> Return x | Apply (f, x) -> Apply (remap f, remap x) | Map (f, x) -> Map (f, remap x) | Map2 (f, x, y) -> Map2 (f, remap x, remap y) | Both (x, y) -> Both (remap x, remap y) | Lambda _ -> t in build' (remap t), Some (Array.of_list fields_used) ;; end let build ~header_map t = let rec transform : type a. a t -> a Without_headers.t = function | Return x -> Without_headers.Return x | Column i -> Without_headers.Column i | Header column -> (match String.Map.find_exn header_map column with | index -> Without_headers.Column index | exception (Not_found_s _ | Caml.Not_found) -> raise_s [%message "Missing column in header" (column : string) (header_map : int String.Map.t)]) | Header_opt h -> (match String.Map.find_exn header_map h with | index -> Without_headers.Map (Option.some, Column index) | exception (Not_found_s _ | Caml.Not_found) -> Without_headers.Return None) | Apply (f, x) -> Without_headers.Apply (transform f, transform x) | Map (f, x) -> Without_headers.Map (f, transform x) | Map2 (f, x, y) -> Without_headers.Map2 (f, transform x, transform y) | Both (x, y) -> Without_headers.Both (transform x, transform y) | Lambda f -> Without_headers.Lambda (f, header_map) in let transformed = transform t in Without_headers.build transformed ;; end include Builder module Parse_header = struct (* This exception is used to return early from the parser, so we don't consume more input than necessary. This is almost [With_return], except declaring the exception at top-level so we can freely pass around a closure that raises it. *) exception Header_parsed of string array * int type t = { state : unit Parse_state.t ; transform : string array -> int String.Map.t } let header_map_opt header_row = Array.foldi header_row ~init:String.Map.empty ~f:(fun i map header -> match header with | None -> map | Some header -> Map.set map ~key:header ~data:i) ;; let header_map header_row = header_map_opt (Array.map ~f:Option.some header_row) let require_header required_headers' csv_headers' = let required_headers = String.Set.of_list required_headers' in let csv_headers = String.Set.of_array csv_headers' in let missing = Set.diff required_headers csv_headers in if not (Set.is_empty missing) then raise_s [%message "Header specified in `Require not present in csv document" (required_headers : String.Set.t) (csv_headers : String.Set.t) (missing : String.Set.t)]; header_map csv_headers' ;; let create' ?strip ?sep ?quote transform = let f offset () row = raise (Header_parsed (Append_only_buffer.to_array row, offset)) in { state = Parse_state.create ?strip ?sep ?quote ~fields_used:None ~init:() ~f () ; transform } ;; let create ?strip ?sep ?quote ?(header = `No) () = match header with | `No -> Second String.Map.empty | `Add headers -> Second (header_map (Array.of_list headers)) | `Yes -> let f headers = header_map headers in First (create' ?strip ?sep ?quote f) | `Require headers -> let f csv_headers = require_header headers csv_headers in First (create' ?strip ?sep ?quote f) | `Replace headers -> let f _ = header_map (Array.of_list headers) in First (create' ?strip ?sep ?quote f) | `Transform f -> let f headers = header_map (Array.of_list (f (Array.to_list headers))) in First (create' ?strip ?sep ?quote f) | `Filter_map f -> let f headers = header_map_opt (Array.of_list (f (Array.to_list headers))) in First (create' ?strip ?sep ?quote f) ;; let input_string t ~len input = try First { t with state = Parse_state.input_string t.state ~len input } with | Header_parsed (row, offset) -> Second (t.transform row, String.sub input ~pos:offset ~len:(len - offset)) ;; let input t ~len input = try First { t with state = Parse_state.input t.state ~len input } with | Header_parsed (row, offset) -> Second (t.transform row, Bytes.To_string.sub input ~pos:offset ~len:(len - offset)) ;; end module Expert = struct module Append_only_buffer = Append_only_buffer module Parse_state = Parse_state module Builder = Builder module Parse_header = Parse_header let create_parse_state ?strip ?sep ?quote ?(on_invalid_row = On_invalid_row.raise) ~header_map builder ~init ~f = let row_to_'a, fields_used = Builder.build ~header_map builder in let f _offset init row = try f init (row_to_'a row) with | exn -> (match on_invalid_row header_map row exn with | `Yield x -> f init x | `Skip -> init | `Raise exn -> raise exn) in Parse_state.create ?strip ?sep ?quote ~fields_used ~init ~f () ;; let manual_parse_state ?strip ?sep ?quote header_map = Parse_state.create ?strip ?sep ?quote ~fields_used:None ~init:(Append_only_buffer.create ()) ~f:(fun _ queue row -> Append_only_buffer.append queue (Row.Expert.of_buffer header_map row); queue) () ;; let manual_parse_data parse_state input = let parse_state = match input with | `Eof -> Parse_state.finish parse_state | `Data s -> Parse_state.input_string parse_state s in let queue = Parse_state.acc parse_state in let result = Append_only_buffer.to_list queue in Append_only_buffer.lax_clear queue; Second parse_state, result ;; let manual_parse_header ?strip ?sep ?quote header_state input = let input = match input with | `Eof -> "" | `Data s -> s in match Parse_header.input_string header_state ~len:(String.length input) input with | First header_state -> First header_state, [] | Second (header_map, input) -> let state = manual_parse_state ?strip ?sep ?quote header_map in manual_parse_data state (`Data input) ;; let create_partial ?strip ?sep ?quote ?header () = let state = Parse_header.create ?strip ?sep ?quote ?header () |> Either.Second.map ~f:(manual_parse_state ?strip ?sep ?quote) |> ref in let parse_chunk input = let state', results = match !state with | First state -> manual_parse_header ?strip ?sep state input | Second state -> manual_parse_data state input in state := state'; results in stage parse_chunk ;; end let fold_string ?strip ?sep ?quote ?header ?on_invalid_row builder ~init ~f csv_string = match match Parse_header.create ?strip ?sep ?quote ?header () with | Second header_map -> Some (header_map, csv_string) | First header_parse -> (match Parse_header.input_string header_parse ~len:(String.length csv_string) csv_string with | First _ -> if String.is_empty csv_string then None else raise_s [%message "String ended mid-header row" (csv_string : string) (sep : char option) (header : Header.t option)] | Second (header_map, csv_string) -> Some (header_map, csv_string)) with | None -> init | Some (header_map, csv_string) -> Parse_state.input_string (Expert.create_parse_state ?strip ?sep ?quote ?on_invalid_row ~header_map builder ~init ~f) csv_string |> Parse_state.finish |> Parse_state.acc ;; let list_of_string ?strip ?sep ?quote ?header ?on_invalid_row builder csv_string = fold_string ?strip ?sep ?quote ?header ?on_invalid_row builder csv_string ~init:(Append_only_buffer.create ()) ~f:(fun queue row -> Append_only_buffer.append queue row; queue) |> Append_only_buffer.to_list ;; let read_lines ?strip ?sep ?quote ?header ?on_invalid_row builder in_channel = let contents = In_channel.input_all in_channel in list_of_string ?strip ?sep ?quote ?header ?on_invalid_row builder contents ;; module Row = struct type 'a builder_t = 'a t include Row let builder = lambda Row.Expert.of_buffer end
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