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-------------------------------------------------------------------------------
--
-- Copyright (C) 2009 Stephe Leake
-- Copyright (C) 1999 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.
-------------------------------------------------------------------------------
with Ada.Text_IO;
package body Simple_Integer_Token is
function Get (ID : in Token.Token_ID;
Value : in Integer := 0) return Instance'Class is
begin
return Instance'Class (Instance'(Nonterminal.Instance (Nonterminal.Get (ID)) with Value => Value));
end Get;
function Value (Subject : in Instance) return Integer is
begin
return Subject.Value;
end Value;
overriding procedure Synthesize_By_Copying
(New_Token : out Instance;
Source : in Token.Instance'Class;
To_ID : in Token.Token_ID)
is begin
if Source in Integer_Literal.Class then
New_Token := (Nonterminal.Instance (Nonterminal.Get (To_ID)) with Integer_Literal.Class (Source).Value);
elsif Source in Class then
New_Token := (Nonterminal.Instance (Nonterminal.Get (To_ID)) with Instance (Source).Value);
else
raise Nonterminal.Invalid_Synth_Argument with
"Token " & Token.Token_ID'Image (To_ID) & " cannot be synthesized " &
"solely from a " & Token.Token_ID'Image (Token.ID (Source)) & ".";
end if;
end Synthesize_By_Copying;
procedure Synthesize_Add
(New_Token : out Nonterminal.Class;
Source : in Token_List.Instance'Class;
To_ID : in Token.Token_ID)
is
use Token_List;
Left : constant List_Iterator := Initial_Iterator (Source);
Right : List_Iterator := Initial_Iterator (Source);
begin
-- Move "Right" over to the third item;
Next_Token (Right);
Next_Token (Right);
New_Token := Class
(Instance'
(Token.Instance (Token.Get (To_ID)) with
(Value (Class (Token_Handle (Left).all)) +
Value (Class (Token_Handle (Right).all)))));
exception
when Constraint_Error =>
raise Nonterminal.Invalid_Synth_Argument with
"Token " & Token.Token_ID'Image (To_ID) & " cannot be synthesized " &
"from a " &
Token.Token_ID'Image (Token.ID (Token_Handle (Left).all)) &
" and a " &
Token.Token_ID'Image (Token.ID (Token_Handle (Right).all)) &
".";
end Synthesize_Add;
procedure Synthesize_Multiply
(New_Token : out Nonterminal.Class;
Source : in Token_List.Instance'Class;
To_ID : in Token.Token_ID)
is
use Token_List;
Left : constant List_Iterator := Initial_Iterator (Source);
Right : List_Iterator := Initial_Iterator (Source);
begin
-- Move "Right" over to the third item;
Next_Token (Right);
Next_Token (Right);
New_Token := Class
(Instance'
(Token.Instance (Token.Get (To_ID)) with
(Value (Class (Token_Handle (Left).all)) *
Value (Class (Token_Handle (Right).all)))));
exception
when Constraint_Error =>
raise Nonterminal.Invalid_Synth_Argument with
"Token " & Token.Token_ID'Image (To_ID) & " cannot be synthesized " &
"from a " &
Token.Token_ID'Image (Token.ID (Token_Handle (Left).all)) &
" and a " &
Token.Token_ID'Image (Token.ID (Token_Handle (Right).all)) &
".";
end Synthesize_Multiply;
procedure Synthesize_From_Second_Argument
(New_Token : out Nonterminal.Class;
Source : in Token_List.Instance'Class;
To_ID : in Token.Token_ID)
is
use Token_List;
Second : List_Iterator := Initial_Iterator (Source);
begin
-- Move "Second" over to the second item;
Next_Token (Second);
New_Token := Class
(Instance'(Nonterminal.Instance (Nonterminal.Get (To_ID)) with
Class (Token_Handle (Second).all).Value));
exception
when Constraint_Error =>
raise Nonterminal.Invalid_Synth_Argument with
"Token " & Token.Token_ID'Image (To_ID) & " cannot be synthesized " &
"solely from a " &
Token.Token_ID'Image
(Token.ID (Token_Handle (Second).all)) & ".";
end Synthesize_From_Second_Argument;
procedure Print_Value
(New_Token : out Nonterminal.Class;
Source : in Token_List.Instance'Class;
To_ID : in Token.Token_ID)
is begin
Ada.Text_IO.Put_Line
(Integer'Image (Value (Class (Token_List.Token_Handle (Token_List.Initial_Iterator (Source)).all))));
Nonterminal.Synthesize_Self (New_Token, Source, To_ID);
end Print_Value;
end Simple_Integer_Token;
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