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314 | with Ada.Strings.Fixed;
package body WL.Generic_Quantities is
Local_Random_Unit_Real : Random_Unit_Real;
function Significant_Digits_Image
(Item : Real;
Sig : Positive)
return String;
Real_To_Quantity_Scale : constant Real := 10.0 ** Decimal_Places;
Quantity_To_Real_Scale : constant Real := 1.0 / Real_To_Quantity_Scale;
---------
-- "*" --
---------
overriding function "*"
(Left, Right : Quantity_Type)
return Quantity_Type
is
begin
return To_Quantity (To_Real (Left) * To_Real (Right));
end "*";
---------
-- "/" --
---------
overriding function "/"
(Left, Right : Quantity_Type)
return Quantity_Type
is
begin
return To_Quantity (To_Real (Left) / To_Real (Right));
end "/";
------------
-- Around --
------------
function Around (X : Quantity_Type;
Inflection : Unit_Real := 0.1;
Shape : Distribution_Type := Linear)
return Quantity_Type
is
Factor : Unit_Real := 1.0;
begin
if Local_Random_Unit_Real = null then
return X;
end if;
case Shape is
when Linear =>
Factor :=
1.0 - Inflection + Local_Random_Unit_Real.all * 2.0 * Factor;
when Quadratic =>
Factor :=
1.0 - Inflection + Local_Random_Unit_Real.all * 2.0 * Factor;
when Normal =>
Factor :=
1.0 - Inflection + Local_Random_Unit_Real.all * 2.0 * Factor;
end case;
return To_Quantity (To_Real (X) * Factor);
end Around;
-----------
-- Image --
-----------
function Image (Item : Quantity_Type) return String is
begin
return Ada.Strings.Fixed.Trim
(Quantity_Type'Image (Item), Ada.Strings.Left);
end Image;
---------
-- Max --
---------
function Max (Left, Right : Quantity_Type) return Quantity_Type is
begin
return Quantity_Type'Max (Left, Right);
end Max;
---------
-- Min --
---------
function Min (Left, Right : Quantity_Type) return Quantity_Type is
begin
return Quantity_Type'Min (Left, Right);
end Min;
-----------
-- Scale --
-----------
function Scale
(X : Quantity_Type;
Factor : Real)
return Quantity_Type
is
begin
return To_Quantity (To_Real (X) * Factor);
end Scale;
----------------
-- Scale_Down --
----------------
function Scale_Down
(Value : Quantity_Type;
Numerator : Quantity_Type;
Denominator : Quantity_Type)
return Quantity_Type
is
begin
return Value * Numerator / Denominator;
end Scale_Down;
---------------------------
-- Set_Random_Unit_Real --
---------------------------
procedure Set_Random_Unit_Real
(Fn : Random_Unit_Real)
is
begin
Local_Random_Unit_Real := Fn;
end Set_Random_Unit_Real;
----------
-- Show --
----------
function Show (Item : Quantity_Type) return String is
Factors : constant array (1 .. 3) of Real :=
(1.0E9, 1.0E6, 1.0E3);
Extensions : constant String := "GMK";
R : constant Real := To_Real (Item);
begin
if R = 0.0 then
return "0";
elsif R < 1.0 then
declare
Img : constant String :=
Natural'Image
(Natural
(Real_To_Quantity_Scale * R)
+ Natural (Real_To_Quantity_Scale * 10.0));
Last : Natural := Img'Last;
begin
while Last > 0 and then Img (Last) = '0' loop
Last := Last - 1;
end loop;
if Last = 0 or else Img (Last) not in '0' .. '9' then
return "0.0";
else
return "0." & Img (Img'First + 3 .. Last);
end if;
end;
else
for I in Factors'Range loop
if R > Factors (I) then
return Significant_Digits_Image (R / Factors (I), 3) &
(1 => Extensions (I));
end if;
end loop;
return Ada.Strings.Fixed.Trim
(Natural'Image (Natural (R)), Ada.Strings.Left);
end if;
end Show;
------------------------------
-- Significant_Digits_Image --
------------------------------
function Significant_Digits_Image (Item : Real;
Sig : Positive)
return String
is
Result : String (1 .. Sig);
Point : Natural := 0;
Acc : Real := Item;
Boundary : constant Real := 10.0**Sig;
begin
if Item < 1.0 / Boundary then
return "0.00";
end if;
if abs Item >= Boundary then
return Ada.Strings.Fixed.Trim (Integer'Image (Integer (Item)),
Ada.Strings.Left);
else
while abs Acc * 10.0 < Boundary loop
Acc := Acc * 10.0;
Point := Point + 1;
end loop;
Result :=
Ada.Strings.Fixed.Trim (Integer'Image (Integer (Acc - 0.5)),
Ada.Strings.Left);
if Point < Sig then
if Point = 0 then
return Result;
else
declare
Before : constant String :=
Result (1 .. Result'Last - Point);
After : constant String :=
Result (Result'Last - Point + 1 .. Result'Last);
begin
if (for all Ch of After => Ch = '0') then
return Before;
else
return Before & "." & After;
end if;
end;
end if;
else
declare
Zeroes : constant String (1 .. Point - Sig) :=
(others => '0');
begin
return "0." & Zeroes & Result;
end;
end if;
end if;
end Significant_Digits_Image;
----------------
-- To_Natural --
----------------
function To_Natural (Value : Quantity_Type) return Natural is
begin
return Natural (To_Real (Value));
end To_Natural;
-----------------
-- To_Quantity --
-----------------
function To_Quantity (Value : Real) return Quantity_Type is
begin
return Quantity_Type (Real (Value * Real_To_Quantity_Scale));
end To_Quantity;
-----------------
-- To_Quantity --
-----------------
function To_Quantity (Value : Natural) return Quantity_Type is
begin
return To_Quantity (Real (Value));
end To_Quantity;
--------------
-- To_Real --
--------------
function To_Real (Value : Quantity_Type) return Real is
begin
return Real (Value) * Quantity_To_Real_Scale;
end To_Real;
----------
-- Unit --
----------
function Unit return Quantity_Type is
begin
return To_Quantity (1.0);
end Unit;
-----------
-- Value --
-----------
function Value (Image : String) return Quantity_Type is
R : Real;
begin
if Image = "" then
R := 0.0;
elsif Image (Image'First) = '~' then
return Around (Value (Image (Image'First + 1 .. Image'Last)));
elsif Image (Image'Last) = 'K' then
R := Real'Value (Image (Image'First .. Image'Last - 1)) * 1.0E3;
elsif Image (Image'Last) = 'M' then
R := Real'Value (Image (Image'First .. Image'Last - 1)) * 1.0E6;
elsif Image (Image'Last) = 'G' then
R := Real'Value (Image (Image'First .. Image'Last - 1)) * 1.0E9;
else
R := Real'Value (Image);
end if;
return To_Quantity (R);
end Value;
----------
-- Zero --
----------
function Zero return Quantity_Type is
begin
return 0;
end Zero;
end WL.Generic_Quantities;
|