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284 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Parsers.Multiline_Source Luebeck --
-- Implementation Winter, 2004 --
-- --
-- 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;
with Strings_Edit.Integers; use Strings_Edit.Integers;
package body Parsers.Multiline_Source is
Initial_Size : constant Integer := 512;
function "<" (Left, Right : Position) return Boolean is
begin
return
( Left.Line < Right.Line
or else
( Left.Line = Right.Line
and then
Left.Column < Right.Column
) );
end "<";
procedure Finalize (Code : in out Source) is
begin
Free (Code.Buffer);
end Finalize;
function End_Of (Code : Source'Class) return Boolean is
begin
return Code.Buffer = null;
end End_Of;
function Get_Line (Code : Source'Class) return String is
begin
if Code.Buffer = null then
raise End_Error;
else
return Code.Buffer (1..Code.Length);
end if;
end Get_Line;
procedure Get_Line
( Code : Source'Class;
Line : out Line_Ptr;
Pointer : out Integer;
Last : out Integer
) is
begin
if Code.Buffer = null then
raise End_Error;
else
Line := Code.Buffer.all'Unchecked_Access;
Pointer := Code.Pointer;
Last := Code.Length;
end if;
end Get_Line;
function Get_Backup_Pointer (Code : Source'Class) return Integer is
begin
return Code.Last;
end Get_Backup_Pointer;
function Get_Location
( Message : String;
Prefix : String := "at "
) return Location is
Pointer : Integer := Message'Last;
Result : Location := ((0, 0), (0, 0));
begin
loop -- An occurence of Prefix
loop -- Searching backwards Message for Prefix
if Pointer < Message'First + Prefix'Length - 1 then
return Result;
end if;
exit when
Message (Pointer - Prefix'Length + 1..Pointer) = Prefix;
Pointer := Pointer - 1;
end loop;
Pointer := Pointer + 1;
-- After the prefix
begin
Get (Message, Pointer, Integer (Result.First.Line));
Result.Next.Line := Result.First.Line;
if ( Pointer >= Message'Last
or else
Message (Pointer) /= ':'
)
then
return Result;
end if;
-- Line:
Pointer := Pointer + 1;
begin
Get (Message, Pointer, Result.First.Column, First => 1);
exception
when others =>
return Result;
end;
-- Line:Column
Result.Next.Column := Result.First.Column;
if ( Pointer + 1 >= Message'Last
or else
Message (Pointer..Pointer + 1) /= ".."
)
then
return Result;
end if;
Pointer := Pointer + 2;
-- Line:Column..
begin
Get (Message, Pointer, Integer (Result.Next.Line));
exception
when others =>
return Result;
end;
-- Line:Column..Line
if ( Pointer >= Message'Last
or else
Message (Pointer) /= ':'
)
then
Result.Next.Column := Integer (Result.Next.Line);
Result.Next.Line := Result.First.Line;
return Result;
end if;
Pointer := Pointer + 1;
-- Line:Column..Line:
begin
Get (Message, Pointer, Result.Next.Column);
-- Line:Column..Line:Column
return Result;
exception
when others =>
Result.Next.Column := Integer (Result.Next.Line);
Result.Next.Line := Result.First.Line;
return Result;
end;
exception
when others =>
return Result;
end;
end loop;
end Get_Location;
function Get_Pointer (Code : Source'Class) return Integer is
begin
return Code.Pointer;
end Get_Pointer;
function Image (Link : Location) return String is
begin
if Link.First = Link.Next then
return
( Image (Integer (Link.First.Line))
& ":"
& Image (Link.First.Column)
);
elsif Link.First.Line = Link.Next.Line then
return
( Image (Integer (Link.First.Line))
& ":"
& Image (Link.First.Column)
& ".."
& Image (Link.Next.Column - 1)
);
else
return
( Image (Integer (Link.First.Line))
& ":"
& Image (Link.First.Column)
& ".."
& Image (Integer (Link.Next.Line))
& ":"
& Image (Link.Next.Column - 1)
);
end if;
end Image;
procedure Initialize (Code : in out Source) is
begin
Code.Buffer := new String (1..Initial_Size);
Next_Line (Code);
exception
when Storage_Error =>
raise;
when others =>
null;
end Initialize;
function Link (Code : Source'Class) return Location is
begin
return ((Code.Line, Code.Last), (Code.Line, Code.Pointer));
end Link;
function "&" (Left, Right : Location) return Location is
Result : Location;
begin
if Left.First < Right.First then
Result.First := Left.First;
else
Result.First := Right.First;
end if;
if Left.Next < Right.Next then
Result.Next := Right.Next;
else
Result.Next := Left.Next;
end if;
return Result;
end "&";
procedure Next_Line (Code : in out Source'Class) is
begin
Code.Pointer := 1;
Code.Last := 1;
Get_Line (Code);
Code.Line := Code.Line + 1;
exception
when End_Error =>
Free (Code.Buffer);
raise;
end Next_Line;
procedure Reset_Pointer (Code : in out Source'Class) is
begin
Code.Pointer := Code.Last;
end Reset_Pointer;
procedure Set_Pointer
( Code : in out Source'Class;
Pointer : Integer
) is
begin
if Code.Buffer = null then
if Pointer /= 1 then
raise Ada.IO_Exceptions.Layout_Error;
end if;
else
if Pointer not in Code.Last..Code.Length + 1 then
raise Ada.IO_Exceptions.Layout_Error;
end if;
end if;
Code.Last := Code.Pointer;
Code.Pointer := Pointer;
end Set_Pointer;
procedure Skip (Code : in out Source'Class; Link : Location) is
begin
if Code.Line > Link.First.Line then
raise Ada.IO_Exceptions.Layout_Error;
end if;
while Code.Line < Link.First.Line loop
Next_Line (Code);
end loop;
Set_Pointer (Code, Link.First.Column);
while Code.Line < Link.Next.Line loop
Next_Line (Code);
end loop;
Set_Pointer (Code, Link.Next.Column);
end Skip;
end Parsers.Multiline_Source;
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