/usr/share/ada/adainclude/gnatcoll/gnatcoll-tribooleans.adb is in libgnatcoll1.6-dev 1.6gpl2014-9.
This file is owned by root:root, with mode 0o644.
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-- G N A T C O L L --
-- --
-- Copyright (C) 2008-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, 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 MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
package body GNATCOLL.Tribooleans is
And_Truth_Table1 : constant array (Triboolean, Triboolean) of Triboolean :=
(True =>
(True => True,
False => False,
Indeterminate => Indeterminate),
False =>
(True => False,
False => False,
Indeterminate => False),
Indeterminate =>
(True => Indeterminate,
False => False,
Indeterminate => Indeterminate));
And_Truth_Table2 : constant array (Triboolean, Boolean) of Triboolean :=
(True => (True => True, False => False),
False => (True => False, False => False),
Indeterminate => (True => Indeterminate, False => False));
Or_Truth_Table1 : constant array (Triboolean, Triboolean) of Triboolean :=
(True =>
(True => True,
False => True,
Indeterminate => True),
False =>
(True => True,
False => False,
Indeterminate => Indeterminate),
Indeterminate =>
(True => True,
False => Indeterminate,
Indeterminate => Indeterminate));
Or_Truth_Table2 : constant array (Triboolean, Boolean) of Triboolean :=
(True => (True => True, False => True),
False => (True => True, False => False),
Indeterminate => (True => True, False => Indeterminate));
Xor_Truth_Table1 : constant array (Triboolean, Triboolean) of Triboolean :=
(True =>
(True => False,
False => True,
Indeterminate => Indeterminate),
False =>
(True => True,
False => False,
Indeterminate => Indeterminate),
Indeterminate =>
(True => Indeterminate,
False => Indeterminate,
Indeterminate => Indeterminate));
Xor_Truth_Table2 : constant array (Triboolean, Boolean) of Triboolean :=
(True => (True => False, False => True),
False => (True => True, False => False),
Indeterminate => (True => Indeterminate, False => Indeterminate));
Eq_Truth_Table1 : constant array (Triboolean, Triboolean) of Triboolean :=
(True =>
(True => True,
False => False,
Indeterminate => Indeterminate),
False =>
(True => False,
False => True,
Indeterminate => Indeterminate),
Indeterminate =>
(True => Indeterminate,
False => Indeterminate,
Indeterminate => Indeterminate));
Eq_Truth_Table2 : constant array (Triboolean, Boolean) of Triboolean :=
(True => (True => True, False => False),
False => (True => False, False => True),
Indeterminate => (True => Indeterminate, False => Indeterminate));
-------------------
-- To_TriBoolean --
-------------------
function To_TriBoolean (Value : Boolean) return Triboolean is
begin
if Value then
return Triboolean'(True);
else
return Triboolean'(False);
end if;
end To_TriBoolean;
----------------
-- To_Boolean --
----------------
function To_Boolean (Value : Triboolean) return Boolean is
begin
return Value = Triboolean'(True);
end To_Boolean;
-----------
-- "not" --
-----------
function "not" (Value : Triboolean) return Triboolean is
begin
case Value is
when Triboolean'(True) => return Triboolean'(False);
when Triboolean'(False) => return Triboolean'(True);
when Triboolean'(Indeterminate) => return Triboolean'(Indeterminate);
end case;
end "not";
-----------
-- "and" --
-----------
function "and" (Value1, Value2 : Triboolean) return Triboolean is
begin
return And_Truth_Table1 (Value1, Value2);
end "and";
function "and" (Value1 : Triboolean; Value2 : Boolean) return Triboolean is
begin
return And_Truth_Table2 (Value1, Value2);
end "and";
function "and" (Value1 : Boolean; Value2 : Triboolean) return Triboolean is
begin
return And_Truth_Table2 (Value2, Value1);
end "and";
----------
-- "or" --
----------
function "or" (Value1, Value2 : Triboolean) return Triboolean is
begin
return Or_Truth_Table1 (Value1, Value2);
end "or";
function "or" (Value1 : Triboolean; Value2 : Boolean) return Triboolean is
begin
return Or_Truth_Table2 (Value1, Value2);
end "or";
function "or" (Value1 : Boolean; Value2 : Triboolean) return Triboolean is
begin
return Or_Truth_Table2 (Value2, Value1);
end "or";
-----------
-- "xor" --
-----------
function "xor" (Value1, Value2 : Triboolean) return Triboolean is
begin
return Xor_Truth_Table1 (Value1, Value2);
end "xor";
function "xor" (Value1 : Triboolean; Value2 : Boolean) return Triboolean is
begin
return Xor_Truth_Table2 (Value1, Value2);
end "xor";
function "xor" (Value1 : Boolean; Value2 : Triboolean) return Triboolean is
begin
return Xor_Truth_Table2 (Value2, Value1);
end "xor";
---------
-- "=" --
---------
function "=" (Value1 : Boolean; Value2 : Triboolean) return Boolean is
begin
if Value1 then
return Value2 = Triboolean'(True);
else
return Value2 = Triboolean'(False);
end if;
end "=";
function "=" (Value1 : Triboolean; Value2 : Boolean) return Boolean is
begin
if Value2 then
return Value1 = Triboolean'(True);
else
return Value1 = Triboolean'(False);
end if;
end "=";
-----------
-- Equal --
-----------
function Equal (Value1 : Triboolean; Value2 : Boolean) return Triboolean is
begin
return Eq_Truth_Table2 (Value1, Value2);
end Equal;
-----------
-- Equal --
-----------
function Equal (Value1 : Boolean; Value2 : Triboolean) return Triboolean is
begin
return Eq_Truth_Table2 (Value2, Value1);
end Equal;
function Equal
(Value1 : Triboolean; Value2 : Triboolean) return Triboolean is
begin
return Eq_Truth_Table1 (Value1, Value2);
end Equal;
-----------
-- Image --
-----------
function Image (Value : Triboolean) return String is
begin
case Value is
when True => return "TRUE";
when False => return "FALSE";
when Indeterminate => return "INDETERMINATE";
end case;
end Image;
-----------
-- Value --
-----------
function Value (Str : String) return Triboolean is
begin
if Boolean'Value (Str) then
return True;
else
return False;
end if;
exception
when Constraint_Error =>
return Indeterminate;
end Value;
end GNATCOLL.Tribooleans;
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