diff --git a/infer/src/backend/printer.ml b/infer/src/backend/printer.ml
index 40385a033..a2b10398b 100644
--- a/infer/src/backend/printer.ml
+++ b/infer/src/backend/printer.ml
@@ -14,56 +14,6 @@ module Hashtbl = Caml.Hashtbl
 module L = Logging
 module F = Format
 
-(** Module to read specific lines from files. The data from any file will stay in memory until the
-    handle is collected by the gc. *)
-module LineReader = struct
-  (** Map a file name to an array of string, one for each line in the file. *)
-  type t = (SourceFile.t, string array) Hashtbl.t
-
-  let create () = Hashtbl.create 1
-
-  let read_file fname =
-    let cin = In_channel.create fname in
-    let lines = ref [] in
-    try
-      while true do
-        let line_raw = In_channel.input_line_exn cin in
-        let line =
-          let len = String.length line_raw in
-          if len > 0 && Char.equal line_raw.[len - 1] '\r' then
-            String.sub line_raw ~pos:0 ~len:(len - 1)
-          else line_raw
-        in
-        lines := line :: !lines
-      done ;
-      assert false (* execution never reaches here *)
-    with End_of_file -> In_channel.close cin ; Array.of_list_rev !lines
-
-
-  let file_data (hash : t) fname =
-    try Some (Hashtbl.find hash fname)
-    with Caml.Not_found -> (
-      try
-        let lines_arr = read_file (SourceFile.to_abs_path fname) in
-        Hashtbl.add hash fname lines_arr ; Some lines_arr
-      with exn when SymOp.exn_not_failure exn -> None )
-
-
-  let from_file_linenum hash fname linenum =
-    match file_data hash fname with
-    | Some lines_arr when linenum > 0 && linenum <= Array.length lines_arr ->
-        Some lines_arr.(linenum - 1)
-    | _ ->
-        None
-
-
-  let from_loc hash loc = from_file_linenum hash loc.Location.file loc.Location.line
-
-  let iter hash fname ~f =
-    file_data hash fname
-    |> Option.iter ~f:(Array.iteri ~f:(fun linenum line -> f (linenum + 1) line))
-end
-
 (** Current formatter for the html output *)
 let curr_html_formatter = ref F.std_formatter
 
@@ -273,7 +223,7 @@ end = struct
           () ) ;
       F.fprintf fmt "</td></tr>@\n"
     in
-    LineReader.iter linereader filename ~f:print_one_line ;
+    LineReader.iteri linereader filename ~f:print_one_line ;
     F.fprintf fmt "</table>@\n" ;
     Errlog.pp_html filename [fname_encoding] fmt global_err_log ;
     Io_infer.Html.close (fd, fmt)
diff --git a/infer/src/backend/printer.mli b/infer/src/backend/printer.mli
index 7f4e3eb55..1bfd8a610 100644
--- a/infer/src/backend/printer.mli
+++ b/infer/src/backend/printer.mli
@@ -10,18 +10,6 @@ open! IStd
 
 (** Printers for the analysis results *)
 
-(** Module to read specific lines from files. The data from any file will stay in memory until the
-    handle is collected by the gc *)
-module LineReader : sig
-  type t
-
-  val create : unit -> t
-  (** create a line reader *)
-
-  val from_loc : t -> Location.t -> string option
-  (** get the line from a location looking for the copy of the file in the results dir *)
-end
-
 val curr_html_formatter : Format.formatter ref
 (** Current html formatter *)
 
diff --git a/infer/src/base/LineReader.ml b/infer/src/base/LineReader.ml
new file mode 100644
index 000000000..a7d4e6b44
--- /dev/null
+++ b/infer/src/base/LineReader.ml
@@ -0,0 +1,55 @@
+(*
+ * Copyright (c) 2009-2013, Monoidics ltd.
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
+
+open! IStd
+module Hashtbl = Caml.Hashtbl
+
+(** Map a file name to an array of string, one for each line in the file. *)
+type t = (SourceFile.t, string array) Hashtbl.t
+
+let create () = Hashtbl.create 1
+
+let read_file fname =
+  let cin = In_channel.create fname in
+  let lines = ref [] in
+  try
+    while true do
+      let line_raw = In_channel.input_line_exn cin in
+      let line =
+        let len = String.length line_raw in
+        if len > 0 && Char.equal line_raw.[len - 1] '\r' then
+          String.sub line_raw ~pos:0 ~len:(len - 1)
+        else line_raw
+      in
+      lines := line :: !lines
+    done ;
+    assert false (* execution never reaches here *)
+  with End_of_file -> In_channel.close cin ; Array.of_list_rev !lines
+
+
+let file_data (hash : t) fname =
+  try Some (Hashtbl.find hash fname)
+  with Caml.Not_found -> (
+    try
+      let lines_arr = read_file (SourceFile.to_abs_path fname) in
+      Hashtbl.add hash fname lines_arr ; Some lines_arr
+    with exn when SymOp.exn_not_failure exn -> None )
+
+
+let from_file_linenum hash fname linenum =
+  match file_data hash fname with
+  | Some lines_arr when linenum > 0 && linenum <= Array.length lines_arr ->
+      Some lines_arr.(linenum - 1)
+  | _ ->
+      None
+
+
+let from_loc hash loc = from_file_linenum hash loc.Location.file loc.Location.line
+
+let iteri hash fname ~f =
+  file_data hash fname |> Option.iter ~f:(Array.iteri ~f:(fun linenum line -> f (linenum + 1) line))
diff --git a/infer/src/base/LineReader.mli b/infer/src/base/LineReader.mli
new file mode 100644
index 000000000..d0b011ee1
--- /dev/null
+++ b/infer/src/base/LineReader.mli
@@ -0,0 +1,22 @@
+(*
+ * Copyright (c) 2009-2013, Monoidics ltd.
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
+
+open! IStd
+
+(** Module to read specific lines from files. The data from any file will stay in memory until the
+    handle is collected by the gc *)
+
+type t
+
+val create : unit -> t
+
+val from_loc : t -> Location.t -> string option
+(** get the line from a location looking for the copy of the file in the results dir *)
+
+val iteri : t -> SourceFile.t -> f:(int -> string -> unit) -> unit
+(** iterate on the lines of the file, with line numbers *)
diff --git a/infer/src/integration/JsonReports.ml b/infer/src/integration/JsonReports.ml
index e1772a90e..97e8926f1 100644
--- a/infer/src/integration/JsonReports.ml
+++ b/infer/src/integration/JsonReports.ml
@@ -307,7 +307,7 @@ let process_summary ~costs_outf summary issues_acc =
 
 
 let process_all_summaries_and_issues ~issues_outf ~costs_outf =
-  let linereader = Printer.LineReader.create () in
+  let linereader = LineReader.create () in
   let filters = Inferconfig.create_filters () in
   let all_issues = ref [] in
   SpecsFiles.iter_from_config ~f:(fun summary ->
diff --git a/infer/src/java/jTrans.ml b/infer/src/java/jTrans.ml
index 2b1ce8a18..c1aa1b909 100644
--- a/infer/src/java/jTrans.ml
+++ b/infer/src/java/jTrans.ml
@@ -39,11 +39,11 @@ let get_start_location_heuristics =
           match line.[next_char_idx] with ' ' | '<' | '(' -> true | _ -> false
         else false )
   in
-  let line_reader = lazy (Printer.LineReader.create ()) in
+  let line_reader = lazy (LineReader.create ()) in
   let rec find_proc_loc_backward name ~lines_to_find loc =
     if lines_to_find <= 0 || loc.Location.line <= 0 then None
     else
-      match Printer.LineReader.from_loc (Lazy.force_val line_reader) loc with
+      match LineReader.from_loc (Lazy.force_val line_reader) loc with
       | None ->
           None
       | Some line when is_proc_line line ~name ->
diff --git a/infer/src/nullsafe/eradicate.ml b/infer/src/nullsafe/eradicate.ml
index 8b135efab..ae69b455c 100644
--- a/infer/src/nullsafe/eradicate.ml
+++ b/infer/src/nullsafe/eradicate.ml
@@ -210,7 +210,7 @@ let analyze checks ({IntraproceduralAnalysis.proc_desc; tenv; _} as analysis_dat
       L.debug Analysis Medium "Signature: %a@\n" (AnnotatedSignature.pp proc_name)
         annotated_signature ;
       let loc = Procdesc.get_loc proc_desc in
-      let linereader = Printer.LineReader.create () in
+      let linereader = LineReader.create () in
       (* Initializing TypeErr signleton. *)
       TypeErr.reset () ;
       (* The main method - during this the actual analysis will happen and TypeErr will be populated with
diff --git a/infer/src/nullsafe/eradicateChecks.ml b/infer/src/nullsafe/eradicateChecks.ml
index 60782b467..6d4a414e4 100644
--- a/infer/src/nullsafe/eradicateChecks.ml
+++ b/infer/src/nullsafe/eradicateChecks.ml
@@ -79,7 +79,7 @@ let check_condition_for_redundancy
   in
   let from_try_with_resources () : bool =
     (* heuristic to check if the condition is the translation of try-with-resources *)
-    match Printer.LineReader.from_loc linereader loc with
+    match LineReader.from_loc linereader loc with
     | Some line ->
         (not (String.is_substring ~substring:"==" line || String.is_substring ~substring:"!=" line))
         && String.is_substring ~substring:"}" line
diff --git a/infer/src/nullsafe/typeCheck.mli b/infer/src/nullsafe/typeCheck.mli
index a4e865206..44ff8ba97 100644
--- a/infer/src/nullsafe/typeCheck.mli
+++ b/infer/src/nullsafe/typeCheck.mli
@@ -34,6 +34,6 @@ val typecheck_node :
   -> AnnotatedSignature.t
   -> TypeState.t
   -> Procdesc.Node.t
-  -> Printer.LineReader.t
+  -> LineReader.t
   -> typecheck_result
 (** Main entry point. Typecheck the CFG node given input typestate, and report issues, if found *)