------------------------------------------------------------------------------
-- Copyright (c) 2014, Natacha Porté --
-- --
-- Permission to use, copy, modify, and distribute this software for any --
-- purpose with or without fee is hereby granted, provided that the above --
-- copyright notice and this permission notice appear in all copies. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES --
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF --
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR --
-- ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES --
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN --
-- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF --
-- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. --
------------------------------------------------------------------------------
package body Natools.S_Expressions.File_Readers is
package Stream_IO renames Ada.Streams.Stream_IO;
overriding procedure Finalize (Object : in out Autoclose) is
begin
if Stream_IO.Is_Open (Object.File) then
Stream_IO.Close (Object.File);
end if;
end Finalize;
-------------------------
-- S-Expression Reader --
-------------------------
function Reader (Name : String) return S_Reader is
begin
return Object : S_Reader do
Stream_IO.Open (Object.Holder.File, Stream_IO.In_File, Name);
Object.Next;
end return;
end Reader;
procedure Set_Filename (Object : in out S_Reader; Name : in String) is
begin
if Stream_IO.Is_Open (Object.Holder.File) then
Stream_IO.Close (Object.Holder.File);
end if;
Stream_IO.Open (Object.Holder.File, Stream_IO.In_File, Name);
Object.Rewind;
end Set_Filename;
procedure Rewind (Object : in out S_Reader) is
begin
Stream_IO.Set_Index (Object.Holder.File, 1);
Object.Reset;
Object.Next;
end Rewind;
overriding procedure Read_More
(Object : in out S_Reader;
Buffer : out Atom_Buffers.Atom_Buffer)
is
Data : Ada.Streams.Stream_Element_Array (0 .. 127);
Last : Ada.Streams.Stream_Element_Offset;
begin
Stream_IO.Read (Object.Holder.File, Data, Last);
if Last in Data'Range then
Buffer.Append (Data (Data'First .. Last));
end if;
end Read_More;
-----------------
-- Atom Reader --
-----------------
function Reader (Name : String) return Atom_Reader is
begin
return Object : Atom_Reader do
Stream_IO.Open (Object.File, Stream_IO.In_File, Name);
end return;
end Reader;
procedure Set_Filename (Object : in out Atom_Reader; Name : in String) is
begin
if Stream_IO.Is_Open (Object.File) then
Stream_IO.Close (Object.File);
end if;
Stream_IO.Open (Object.File, Stream_IO.In_File, Name);
end Set_Filename;
function Length (Object : Atom_Reader) return Count is
begin
return Count (Stream_IO.Size (Object.File));
end Length;
function Read (Object : Atom_Reader) return Atom is
Result : Atom (1 .. Object.Length);
Last : Count;
begin
Stream_IO.Set_Index (Object.File, 1);
Stream_IO.Read (Object.File, Result, Last);
pragma Assert (Last = Result'Last);
return Result;
end Read;
procedure Read
(Object : in Atom_Reader;
Data : out Atom;
Length : out Count) is
begin
Stream_IO.Set_Index (Object.File, 1);
Stream_IO.Read (Object.File, Data, Length);
Length := Object.Length;
end Read;
procedure Read
(Object : in Atom_Reader;
Buffer : out Atom_Buffers.Atom_Buffer;
Block_Size : in Count := 1024)
is
Block : Atom (1 .. Block_Size);
Last : Count;
begin
Buffer.Soft_Reset;
Stream_IO.Set_Index (Object.File, 1);
loop
Stream_IO.Read (Object.File, Block, Last);
exit when Last not in Block'Range;
Buffer.Append (Block (Block'First .. Last));
end loop;
end Read;
procedure Query
(Object : in Atom_Reader;
Process : not null access procedure (Data : in Atom))
is
Buffer : Atom_Access := null;
Last : Count;
begin
Buffer := new Atom (1 .. Object.Length);
Stream_IO.Set_Index (Object.File, 1);
Stream_IO.Read (Object.File, Buffer.all, Last);
pragma Assert (Last = Buffer'Last);
Process (Buffer.all);
Unchecked_Deallocation (Buffer);
exception
when others =>
Unchecked_Deallocation (Buffer);
raise;
end Query;
procedure Block_Query
(Object : in Atom_Reader;
Block_Size : in Count;
Process : not null access procedure (Block : in Atom))
is
Block : Atom (1 .. Block_Size);
Last : Count;
begin
Stream_IO.Set_Index (Object.File, 1);
loop
Stream_IO.Read (Object.File, Block, Last);
exit when Last not in Block'Range;
Process.all (Block (Block'First .. Last));
end loop;
end Block_Query;
overriding procedure Finalize (Object : in out Atom_Reader) is
begin
if Stream_IO.Is_Open (Object.File) then
Stream_IO.Close (Object.File);
end if;
end Finalize;
end Natools.S_Expressions.File_Readers;