4 files changed, 65 insertions, 0 deletions
diff --git a/lib/csv/csv.ml b/lib/csv/csv.ml
new file mode 100644
index 0000000..db7329d
--- /dev/null
+++ b/lib/csv/csv.ml
@@ -0,0 +1,30 @@
+open StdLabels
+
+type t = int
+
+let column_of_char = function
+  | 'A' .. 'Z' as c -> Char.code c - (Char.code 'A' - 1)
+  | 'a' .. 'z' as c -> Char.code c - (Char.code 'a' - 1)
+  | c -> raise (Invalid_argument ("column: " ^ Char.escaped c))
+
+let column_of_string : string -> int =
+ fun s ->
+  String.fold_left s ~init:0 ~f:(fun value c -> (value * 26) + column_of_char c)
+
+(** Accumulate the remaining for the successives divisions in a list. *)
+let rec _to_char ~b i =
+  if i > 0 then
+    let res = i mod 26 in
+    let res = if res = 0 then 26 else res in
+
+    let c = char_of_int @@ (res + 64) in
+    (* The modulo is accumulated in the list head, which is the expected
+       sequence *)
+    let b = c :: b in
+
+    _to_char ~b @@ ((i - res) / 26)
+  else b
+
+let column_to_string i =
+  let res = _to_char ~b:[] i in
+  List.to_seq res |> String.of_seq
diff --git a/lib/csv/dataType.ml b/lib/csv/dataType.ml
new file mode 100644
index 0000000..c582b9c
--- /dev/null
+++ b/lib/csv/dataType.ml
@@ -0,0 +1,21 @@
+let match_date = Re.Str.regexp {|[0-9]+/[0-9]+/[0-9]+|}
+
+type t =
+  | Null
+  | Error of string
+  | Content of string
+  | Integer of int
+  | Float of float
+
+let to_string = function
+  | Null -> ""
+  | Error s -> s
+  | Integer i -> string_of_int i
+  | Float f -> string_of_float f
+  | Content c -> (
+      match String.starts_with ~prefix:"0" c with
+      | false -> c
+      | true ->
+          (* If the string is a date, do not escape it *)
+          if Re.Str.string_match match_date c 0 then c
+          else String.concat "" [ "=\""; c; "\"" ])
diff --git a/lib/csv/dataType.mli b/lib/csv/dataType.mli
new file mode 100644
index 0000000..ebb8bc7
--- /dev/null
+++ b/lib/csv/dataType.mli
@@ -0,0 +1,8 @@
+type t =
+  | Null
+  | Error of string
+  | Content of string
+  | Integer of int
+  | Float of float
+
+val to_string : t -> string
diff --git a/lib/csv/dune b/lib/csv/dune
new file mode 100755
index 0000000..b0f4a72
--- /dev/null
+++ b/lib/csv/dune
@@ -0,0 +1,6 @@
+(library
+ (name importCSV)
+ (libraries 
+   re
+ )
+)