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599 | pragma Ada_2022;
with Ada.Strings.Wide_Wide_Hash;
package body Cashe.Exchange is
-- TODO: looks promising: https://github.com/fawazahmed0/currency-api and
-- https://openexchangerates.org/
-- It will likely be moved into its own library like Cashe.Online_Exchange
-- For creating exchange rates.
-- Easiest just to do this.
function Create
(From : Currency_Handling.Currency_Data;
To : ISO.Currencies.Currency;
Rate : Decimal)
return Exchange_Rate is
((From => From,
To => (Currency_Handling.Type_ISO_Currency, To),
ExRate => Rate));
function Create
(From : Currency_Handling.Currency_Data;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
return Exchange_Rate is
((From => From,
To => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (To)),
ExRate => Rate));
function Create
(From : Currency_Handling.Currency_Data;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
return Exchange_Rate is
((From => From,
To => (Currency_Handling.Type_Custom_Currency, To),
ExRate => Rate));
function Create
(From : ISO.Currencies.Currency;
To : ISO.Currencies.Currency;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_ISO_Currency, From),
To => (Currency_Handling.Type_ISO_Currency, To),
ExRate => Rate));
function Create
(From : ISO.Currencies.Currency;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_ISO_Currency, From),
To => (Currency_Handling.Type_Custom_Currency, To),
ExRate => Rate));
function Create
(From : ISO.Currencies.Currency;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_ISO_Currency, From),
To => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (To)),
ExRate => Rate));
function Create
(From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (From)),
To => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (To)),
ExRate => Rate));
function Create
(From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Currency;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (From)),
To => (Currency_Handling.Type_ISO_Currency, To),
ExRate => Rate));
function Create
(From : ISO.Currencies.Alphabetic_Code;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (From)),
To => (Currency_Handling.Type_Custom_Currency, To),
ExRate => Rate));
function Create
(From : Currency_Handling.Custom_Currency;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_Custom_Currency, From),
To => (Currency_Handling.Type_Custom_Currency, To),
ExRate => Rate));
function Create
(From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Currency;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_Custom_Currency, From),
To => (Currency_Handling.Type_ISO_Currency, To),
ExRate => Rate));
function Create
(From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
return Exchange_Rate is
((From => (Currency_Handling.Type_Custom_Currency, From),
To => (Currency_Handling.Type_ISO_Currency,
ISO.Currencies.From_Code (To)),
ExRate => Rate));
-- Intemediate conversion function
-- Internal conversion function on exchange rate.
function Internal_Convert
(This : Exchange_Rate;
From : Money_Handling.Money)
return Money_Handling.Money is
use Money_Handling;
use Currency_Handling;
begin
-- If from is the same currency we need, return the inverse.
-- This shouldn't really happen, but it MIGHT.
if From.Get_Currency = This.From then
return From_Major (From.As_Major * This.ExRate, This.To);
elsif From.Get_Currency = This.To then
return From_Major
(From.As_Major * Decimal (1.0 / This.ExRate), This.From);
else
return From_Major (0.0, This.To);
end if;
end Internal_Convert;
-- Internal function
procedure Internal_Set_Base
(This : in out Currency_Exchange;
Base : Currency_Handling.Currency_Data) is
begin
This.Base := Base;
This.Base_Set := True;
end Internal_Set_Base;
procedure Set_Base
(This : in out Currency_Exchange;
Base : ISO.Currencies.Currency)
is
use Currency_Handling;
Setter : constant Currency_Data := (Type_ISO_Currency, Base);
begin
Internal_Set_Base (This, Setter);
end Set_Base;
procedure Set_Base
(This : in out Currency_Exchange;
Base : ISO.Currencies.Alphabetic_Code) is
use Currency_Handling;
use ISO.Currencies;
Setter : constant Currency_Data := (Type_ISO_Currency, From_Code (Base));
begin
Internal_Set_Base (This, Setter);
end Set_Base;
procedure Set_Base
(This : in out Currency_Exchange;
Base : Currency_Handling.Custom_Currency)
is
use Currency_Handling;
Setter : constant Currency_Data := (Type_Custom_Currency, Base);
begin
Internal_Set_Base (This, Setter);
end Set_Base;
function Base_Is_Set (This : Currency_Exchange) return Boolean is
(This.Base_Set);
-- Internal version
procedure Internal_Set_Rate
(This : in out Currency_Exchange;
Item : Exchange_Rate)
is
Inverse : constant Exchange_Rate :=
(From => Item.To,
To => Item.From,
ExRate => Decimal (1.0 / (if Item.ExRate /= 0.0 then
Item.ExRate else 1.0)));
begin
-- Insert the current item
if This.Exchange.Contains (Item.From) then
This.Exchange (Item.From).Include (Item.To, Item);
else
declare
Initial_Map : To_Map.Map;
begin
Initial_Map.Include (Item.To, Item);
This.Exchange.Include (Item.From, Initial_Map);
end;
end if;
-- Insert the inverse if a record does not already exist
if This.Exchange.Contains (Inverse.From) then
if not This.Exchange (Inverse.From).Contains (Inverse.To) then
This.Exchange (Inverse.From).Include (Inverse.To, Inverse);
end if;
else
declare
Initial_Map : To_Map.Map;
begin
Initial_Map.Include (Inverse.To, Inverse);
This.Exchange.Include (Inverse.From, Initial_Map);
end;
end if;
end Internal_Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : ISO.Currencies.Currency;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : ISO.Currencies.Currency;
To : ISO.Currencies.Currency;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : ISO.Currencies.Currency;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Currency;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Currency;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
is
Setter : constant Exchange_Rate := Create (From, To, Rate);
begin
Internal_Set_Rate (This, Setter);
end Set_Rate;
-- These can be used if the base is enabled.
procedure Set_Rate
(This : in out Currency_Exchange;
To : Currency_Handling.Custom_Currency;
Rate : Decimal)
is
use Currency_Handling;
begin
case This.Base.Which_Currency_Type is
when Type_Custom_Currency =>
Internal_Set_Rate (This, Create (This.Base.Custom_Code, To, Rate));
when Type_ISO_Currency =>
Internal_Set_Rate (This, Create (This.Base.ISO_Code, To, Rate));
end case;
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
To : ISO.Currencies.Currency;
Rate : Decimal)
is
use Currency_Handling;
begin
case This.Base.Which_Currency_Type is
when Type_Custom_Currency =>
Internal_Set_Rate (This, Create (This.Base.Custom_Code, To, Rate));
when Type_ISO_Currency =>
Internal_Set_Rate (This, Create (This.Base.ISO_Code, To, Rate));
end case;
end Set_Rate;
procedure Set_Rate
(This : in out Currency_Exchange;
To : ISO.Currencies.Alphabetic_Code;
Rate : Decimal)
is
use Currency_Handling;
begin
case This.Base.Which_Currency_Type is
when Type_Custom_Currency =>
Internal_Set_Rate (This, Create (This.Base.Custom_Code, To, Rate));
when Type_ISO_Currency =>
Internal_Set_Rate (This, Create (This.Base.ISO_Code, To, Rate));
end case;
end Set_Rate;
function Internal_Search_Rate
(This : Currency_Exchange;
Search : Exchange_Rate)
return Exchange_Rate is begin
if This.Exchange.Contains (Search.From) and then
This.Exchange (Search.From).Contains (Search.To)
then
-- Return the found exchange rate.
return This.Exchange (Search.From).Element (Search.To);
else
-- Return an empty exchange rate.
return (Search.From, Search.To, 0.0);
end if;
end Internal_Search_Rate;
function Rate
(This : Currency_Exchange;
From : ISO.Currencies.Currency;
To : ISO.Currencies.Currency)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : ISO.Currencies.Currency;
To : Currency_Handling.Custom_Currency)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : ISO.Currencies.Currency;
To : ISO.Currencies.Alphabetic_Code)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Alphabetic_Code)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Currency)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : Currency_Handling.Custom_Currency)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : Currency_Handling.Custom_Currency)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Currency)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Alphabetic_Code)
return Decimal is
Search : constant Exchange_Rate := Create (From, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
To : Currency_Handling.Custom_Currency)
return Decimal is
Search : constant Exchange_Rate := Create (This.Base, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
To : ISO.Currencies.Currency)
return Decimal is
Search : constant Exchange_Rate := Create (This.Base, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
function Rate
(This : Currency_Exchange;
To : ISO.Currencies.Alphabetic_Code)
return Decimal is
Search : constant Exchange_Rate := Create (This.Base, To, 0.0);
begin
return Internal_Search_Rate (This, Search).ExRate;
end Rate;
-- Validate if a conversion is in the exchange
function Contains
(This : Currency_Exchange;
From : ISO.Currencies.Currency;
To : ISO.Currencies.Currency)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : ISO.Currencies.Currency;
To : Currency_Handling.Custom_Currency)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : ISO.Currencies.Currency;
To : ISO.Currencies.Alphabetic_Code)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Alphabetic_Code)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : ISO.Currencies.Currency)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : ISO.Currencies.Alphabetic_Code;
To : Currency_Handling.Custom_Currency)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : Currency_Handling.Custom_Currency)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Currency)
return Boolean is (This.Rate (From, To) > 0.0);
function Contains
(This : Currency_Exchange;
From : Currency_Handling.Custom_Currency;
To : ISO.Currencies.Alphabetic_Code)
return Boolean is (This.Rate (From, To) > 0.0);
function Convert
(This : Currency_Exchange;
From : Money_Handling.Money;
To : ISO.Currencies.Currency)
return Money_Handling.Money
is
use Currency_Handling;
ExRate : constant Exchange_Rate :=
(case From.Get_Currency.Which_Currency_Type is
when Type_Custom_Currency =>
Internal_Search_Rate
(This, Create (From.Get_Currency.Custom_Code,
To, 0.0)),
when Type_ISO_Currency =>
Internal_Search_Rate
(This, Create (From.Get_Currency.ISO_Code,
To, 0.0)));
begin
return Internal_Convert (ExRate, From);
end Convert;
function Convert
(This : Currency_Exchange;
From : Money_Handling.Money;
To : ISO.Currencies.Alphabetic_Code)
return Money_Handling.Money
is
use Currency_Handling;
ExRate : constant Exchange_Rate :=
(case From.Get_Currency.Which_Currency_Type is
when Type_Custom_Currency =>
Internal_Search_Rate
(This, Create (From.Get_Currency.Custom_Code,
To, 0.0)),
when Type_ISO_Currency =>
Internal_Search_Rate
(This, Create (From.Get_Currency.ISO_Code,
To, 0.0)));
begin
return Internal_Convert (ExRate, From);
end Convert;
function Convert
(This : Currency_Exchange;
From : Money_Handling.Money;
To : Currency_Handling.Custom_Currency)
return Money_Handling.Money
is
use Currency_Handling;
ExRate : constant Exchange_Rate :=
(case From.Get_Currency.Which_Currency_Type is
when Type_Custom_Currency =>
Internal_Search_Rate
(This, Create (From.Get_Currency.Custom_Code,
To, 0.0)),
when Type_ISO_Currency =>
Internal_Search_Rate
(This, Create (From.Get_Currency.ISO_Code,
To, 0.0)));
begin
return Internal_Convert (ExRate, From);
end Convert;
function Exchange_Hashed (Item : Currency_Handling.Currency_Data)
return Ada.Containers.Hash_Type
is
use Currency_Handling;
use Ada.Containers;
use ISO.Currencies;
begin
case Item.Which_Currency_Type is
when Type_ISO_Currency =>
return Hash_Type (Currency_Key'Pos (Item.ISO_Code.Key));
when Type_Custom_Currency =>
return Ada.Strings.Wide_Wide_Hash
(Item.Custom_Code.Code &
Item.Custom_Code.Name &
Item.Custom_Code.Symbol &
Item.Custom_Code.Unit'Wide_Wide_Image);
end case;
end Exchange_Hashed;
end Cashe.Exchange;
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