with Ada.Text_IO;
with Ada.Text_IO.Unbounded_IO;
with Ada.Strings.Unbounded;      use Ada.Strings.Unbounded;
with Ada.Containers.Vectors;     use Ada.Containers;
 
procedure Quotes is
   package IO renames Ada.Text_IO;
   package SUIO renames Ada.Text_IO.Unbounded_IO;
   package Quote_Container is new Vectors (Natural, Unbounded_String);
   use Quote_Container;
   Quotes    : Vector;
   Input     : IO.File_Type;
   Needle    : Unbounded_String;
   Pos       : Cursor;
begin
   IO.Open (File => Input,
            Mode => IO.In_File,
            Name => "quotes.txt");
   while not IO.End_Of_File (File => Input) loop
      Quotes.Append (New_Item => SUIO.Get_Line (File => Input));
   end loop;
   IO.Close (Input);
 
   --  First search. This will fail because we have no FooBar quote.
   Needle := To_Unbounded_String ("FooBar");
   Pos := Quotes.Find (Item  => Needle);
 
   if Pos = No_Element then
      IO.Put_Line ("No_Element");
   else
      IO.Put_Line (To_Index (Position => Pos)'Img);
   end if;
 
   --  Second search. This will succeed, finding the quote at index 7.
   Needle := To_Unbounded_String 
     ("Most days I wake up thinking I'm the luckiest bastard alive.");
   Pos := Quotes.Find (Item  => Needle);
 
   if Pos = No_Element then
      IO.Put_Line ("No_Element");
   else
      IO.Put_Line (To_Index (Position => Pos)'Img);
   end if;
 
   --  Third search. This will fail, because we start the search at index 8.
   Needle := To_Unbounded_String 
     ("Most days I wake up thinking I'm the luckiest bastard alive.");
   Pos := Quotes.To_Cursor (Index => 8);
   Pos := Quotes.Find (Item  => Needle,
                       Position => Pos);
 
   if Pos = No_Element then
      IO.Put_Line ("No_Element");
   else
      IO.Put_Line (To_Index (Position => Pos)'Img);
   end if;
end Quotes;

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