-- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Parsers.Multiline_Source.Stream_IO Luebeck --
-- Implementation Spring, 2010 --
-- --
-- Last revision : 13:13 14 Sep 2019 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with Ada.IO_Exceptions; use Ada.IO_Exceptions;
package body Parsers.Multiline_Source.Stream_IO is
Increment : constant Integer := 512;
function Default_Delimiters return Map is
Result : Map;
begin
Add (Result, Character'Val (4), Text_End);
Add (Result, Character'Val (10), Line_End);
Add (Result, Character'Val (13), Line_Trailer);
return Result;
end Default_Delimiters;
procedure Get_Line (Code : in out Source) is
Item : Character;
Index : Integer;
begin
if Code.Terminated or else Code.Buffer = null then
raise End_Error;
end if;
Code.Length := 0;
begin
loop
Character'Read (Code.Stream, Item);
Index := Find (Code.Delimiters, Item);
if Index > 0 then
case Get (Code.Delimiters, Index) is
when Line_End =>
exit;
when Text_End =>
raise End_Error;
when Line_Trailer =>
null;
end case;
end if;
if Code.Length = Code.Buffer'Length then
declare
Old_Line : String_Ptr := Code.Buffer;
begin
Code.Buffer :=
new String (1..Old_Line'Length + Increment);
Code.Buffer (1..Old_Line'Length) := Old_Line.all;
Free (Old_Line);
end;
end if;
Code.Length := Code.Length + 1;
Code.Buffer (Code.Length) := Item;
end loop;
exception
when End_Error =>
Code.Terminated := True;
if Code.Length = 0 then
raise;
end if;
end;
while ( Code.Length > 0
and then
Find (Code.Delimiters, Code.Buffer (Code.Length)) > 0
)
loop
Code.Length := Code.Length - 1;
end loop;
exception
when others =>
Free (Code.Buffer);
raise;
end Get_Line;
end Parsers.Multiline_Source.Stream_IO;