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-------------------------------------------------------------------------------
--
-- Copyright (C) 1999 FlightSafety International and Ted Dennison
--
-- This file is part of the OpenToken package.
--
-- The OpenToken package 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 3, or (at your option)
-- any later version. The OpenToken package 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 distributed with the OpenToken
-- package; see file GPL.txt. If not, write to the Free Software Foundation,
-- 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.
--
-- This software was originally developed by the following company, and was
-- released as open-source software as a service to the community:
--
-- FlightSafety International Simulation Systems Division
-- Broken Arrow, OK USA 918-259-4000
--
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
-- This package implements a token recognizer for a line comment. A line comment
-- is a comment that runs from the introducer to the end of the line
-------------------------------------------------------------------------------
package body OpenToken.Recognizer.Line_Comment is
----------------------------------------------------------------------------
-- This procedure will be called when analysis on a new candidate string
-- is started. The Token needs to clear its state (if any).
----------------------------------------------------------------------------
overriding procedure Clear (The_Token : in out Instance) is
begin
The_Token.State := Introducer;
The_Token.Introducer_Substate := 1;
end Clear;
----------------------------------------------------------------------------
-- This procedure will be called to perform further analysis on a token
-- based on the given next character.
----------------------------------------------------------------------------
overriding procedure Analyze
(The_Token : in out Instance;
Next_Char : in Character;
Verdict : out Analysis_Verdict)
is begin
case The_Token.State is
when Introducer =>
-- The character must match the comment introducer string
if Next_Char = The_Token.Introducer_Text (The_Token.Introducer_Substate) then
-- set the next state
if The_Token.Introducer_Substate = The_Token.Introducer_Length then
Verdict := Matches;
The_Token.State := Text;
else
Verdict := So_Far_So_Good;
The_Token.Introducer_Substate := The_Token.Introducer_Substate + 1;
end if;
else
Verdict := Failed;
The_Token.State := Done;
end if;
when Text =>
-- If we read an end of line, its no longer a comment. Fail and go to done
if Next_Char = EOL_Character or Next_Char = EOF_Character then
Verdict := Failed;
The_Token.State := Done;
else
Verdict := Matches;
end if;
when Done =>
-- We shouldn't get called from here.
Verdict := Failed;
end case;
end Analyze;
----------------------------------------------------------------------------
-- This procedure will be called to create a Line Comment token
----------------------------------------------------------------------------
function Get (Comment_Introducer : in String;
Reportable : in Boolean := False) return Instance is
New_Token : Instance;
begin
New_Token.Introducer_Text (1 .. Comment_Introducer'Length) := Comment_Introducer;
New_Token.Introducer_Length := Comment_Introducer'Length;
New_Token.Report := Reportable;
return New_Token;
end Get;
end OpenToken.Recognizer.Line_Comment;
|
