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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 keywords. To match,
-- the token has to match the keyword EXACTLY. There is, however a
-- global switch for case-sensitivity.
-----------------------------------------------------------------------------
package OpenToken.Recognizer.Keyword is
-- It is usually a lot easier on the user if keywords are not
-- case-sensitive, so that's our default.
Default_Case_Sensitivity : Boolean := False;
type Instance is new OpenToken.Recognizer.Instance with private;
--------------------------------------------------------------------------
-- This procedure will be called to create a keyword token.
-- Setting Case_Sensitive to false allows the token to match
-- keywords typed in upper or lower case.
--------------------------------------------------------------------------
function Get (Keyword_Literal : in String;
Case_Sensitive : in Boolean := Default_Case_Sensitivity;
Reportable : in Boolean := True) return Instance;
private
type State_ID is (Text, Done);
type Instance is new OpenToken.Recognizer.Instance with record
-- The keyword definition
Literal : Buffers.Bounded_String;
Case_Sensitive : Boolean;
-- The finite state machine state
State : State_ID := Text;
Substate : Integer := 1;
end record;
overriding procedure Clear (The_Token : in out Instance);
overriding procedure Analyze
(The_Token : in out Instance;
Next_Char : in Character;
Verdict : out Analysis_Verdict);
end OpenToken.Recognizer.Keyword;
|
