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(*
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* Firebird Interface (fbintf). The fbintf components provide a set of
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* Pascal language bindings for the Firebird API. Although predominantly
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* a new development they include source code taken from IBX and may be
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* considered a derived product. This software thus also includes the copyright
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* notice and license conditions from IBX.
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*
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* Except for those parts dervied from IBX, contents of this file are subject
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* to the Initial Developer's Public License Version 1.0 (the "License"); you
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* may not use this file except in compliance with the License. You may obtain a
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* copy of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2021 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit FBNumeric;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBActivityMonitor, FmtBCD;
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{ The IFBNumeric interface is a managed type to hold a fixed point integer
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as a 64-bit signed integer plus a scale factor. i.e. the scale factor is
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the base 10 exponent in
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Fixed Point Value = <64-bit signed integer> * 10^<scale factor>
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}
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function NewNumeric(aValue: AnsiString): IFBNumeric; overload;
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function NewNumeric(aValue: double; aScale: integer): IFBNumeric; overload;
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function NewNumeric(aValue: TBCD): IFBNumeric; overload;
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function NewNumeric(aValue: currency): IFBNumeric; overload;
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function NewNumeric(aValue: Int64): IFBNumeric; overload;
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function NumericFromRawValues(aValue: Int64; aScale: integer): IFBNumeric;
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function TryStrToNumeric(S: Ansistring; out Value: int64; out scale: integer): boolean;
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function NumericToDouble(aValue: Int64; aScale: integer): double;
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function SafeSmallInt(aValue: Int64): Smallint;
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function SafeInteger(aValue: Int64): integer;
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implementation
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uses IBUtils, FBMessages, Math;
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type
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{ TIBNumeric }
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{ TFBNumeric }
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TFBNumeric = class(TFBInterfacedObject,IFBNumeric)
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private
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FValue: Int64;
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FScale: integer;
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// function AdjustScaleFromCurrency(Value: Currency; aScale: Integer): Int64;
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public
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constructor Create(aValue: Int64; aScale: integer); overload;
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constructor Create(aValue: Int64); overload;
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constructor Create(aValue: AnsiString); overload;
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constructor Create(aValue: double; aScale: integer); overload;
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constructor Create(aValue: Currency); overload;
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constructor Create(aValue: TBCD); overload;
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public
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{IFBNumeric}
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function getRawValue: Int64;
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function getScale: integer;
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function clone(aNewScale: integer): IFBNumeric;
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function getAsString: AnsiString;
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function getAsDouble: double;
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function getAsCurrency: Currency;
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function getAsBCD: TBCD;
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function getAsInt64: Int64; {scaled}
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function getAsInteger: integer; {scaled - may be truncated}
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function getAsSmallInt: SmallInt; {scaled - may be truncated}
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end;
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function NewNumeric(aValue: AnsiString): IFBNumeric;
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begin
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Result := TFBNumeric.Create(aValue);
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end;
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function NewNumeric(aValue: double; aScale: integer): IFBNumeric;
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begin
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Result := TFBNumeric.Create(aValue,aScale);
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end;
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function NewNumeric(aValue: TBCD): IFBNumeric;
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begin
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Result := TFBNumeric.Create(aValue);
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end;
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function NewNumeric(aValue: currency): IFBNumeric;
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begin
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Result := TFBNumeric.Create(aValue);
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end;
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function NewNumeric(aValue: Int64): IFBNumeric;
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begin
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Result := TFBNumeric.Create(aValue);
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end;
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function NumericFromRawValues(aValue: Int64; aScale: integer): IFBNumeric;
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begin
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Result := TFBNumeric.Create(aValue,aScale);
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end;
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function TryStrToNumeric(S: Ansistring; out Value: int64; out scale: integer): boolean;
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var i: integer;
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ds: integer;
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exponent: integer;
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begin
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Result := false;
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ds := 0;
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exponent := 0;
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S := Trim(S);
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Value := 0;
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scale := 0;
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if Length(S) = 0 then
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Exit;
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{$IF declared(DefaultFormatSettings)}
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with DefaultFormatSettings do
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{$ELSE}
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{$IF declared(FormatSettings)}
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with FormatSettings do
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{$IFEND}
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{$IFEND}
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begin
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for i := length(S) downto 1 do
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begin
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if S[i] = AnsiChar(DecimalSeparator) then
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begin
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if ds <> 0 then Exit; {only one allowed}
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ds := i;
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dec(exponent);
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system.Delete(S,i,1);
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end
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else
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if S[i] in ['+','-'] then
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begin
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if (i > 1) and not (S[i-1] in ['e','E']) then
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Exit; {malformed}
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end
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else
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if S[i] in ['e','E'] then {scientific notation}
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begin
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if ds <> 0 then Exit; {not permitted in exponent}
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if exponent <> 0 then Exit; {only one allowed}
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exponent := i;
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end
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else
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if not (S[i] in ['0'..'9']) then
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{Note: ThousandSeparator not allowed by Delphi specs}
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Exit; {bad character}
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end;
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if exponent > 0 then
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begin
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Result := TryStrToInt(system.copy(S,exponent+1,maxint),Scale);
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if Result then
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begin
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{adjust scale for decimal point}
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if ds <> 0 then
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Scale := Scale - (exponent - ds);
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Result := TryStrToInt64(system.copy(S,1,exponent-1),Value);
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end;
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end
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else
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begin
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if ds > 0 then
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begin
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{remove trailing zeroes}
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while (ds < length(S)) and (S[length(S)] = '0') do {no need to check length as ds > 0}
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system.delete(S,Length(S),1);
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scale := ds - Length(S) - 1;
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end;
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Result := TryStrToInt64(S,Value);
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end;
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end;
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end;
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function NumericToDouble(aValue: Int64; aScale: integer): double;
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begin
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Result := aValue * IntPower(10,aScale);
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end;
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function SafeSmallInt(aValue: Int64): Smallint;
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begin
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if aValue > High(smallint) then
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IBError(ibxeIntegerOverflow,[]);
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if aValue < Low(smallint) then
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IBError(ibxIntegerUnderflow,[]);
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Result := aValue;
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end;
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function SafeInteger(aValue: Int64): integer;
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begin
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if aValue > High(integer) then
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IBError(ibxeIntegerOverflow,[]);
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if aValue < Low(integer) then
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IBError(ibxIntegerUnderflow,[]);
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Result := aValue;
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end;
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{ TFBNumeric }
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(*function TFBNumeric.AdjustScaleFromCurrency(Value: Currency; aScale: Integer
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): Int64;
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var
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Scaling : Int64;
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i : Integer;
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begin
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Result := 0;
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Scaling := 1;
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if aScale < 0 then
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begin
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for i := -1 downto aScale do
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Scaling := Scaling * 10;
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result := trunc(Value * Scaling);
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end
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else
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if aScale > 0 then
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begin
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for i := 1 to aScale do
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Scaling := Scaling * 10;
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result := trunc(Value / Scaling);
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end
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else
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result := trunc(Value);
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end;*)
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constructor TFBNumeric.Create(aValue: Int64; aScale: integer);
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begin
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inherited Create;
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FValue := aValue;
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FScale := aScale;
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end;
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constructor TFBNumeric.Create(aValue: Int64);
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begin
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inherited Create;
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FValue := aValue;
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FScale := 0;
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end;
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constructor TFBNumeric.Create(aValue: AnsiString);
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begin
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inherited Create;
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if not TryStrToNumeric(aValue,FValue,FScale) then
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IBError(ibxeInvalidDataConversion,[aValue]);
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end;
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constructor TFBNumeric.Create(aValue: double; aScale: integer);
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var
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Scaling : Int64;
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i : Integer;
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begin
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inherited Create;
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FScale := aScale;
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FValue := 0;
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Scaling := 1;
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if aScale < 0 then
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begin
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for i := -1 downto aScale do
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Scaling := Scaling * 10;
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FValue := trunc(aValue * Scaling);
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end
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else
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if aScale > 0 then
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begin
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for i := 1 to aScale do
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Scaling := Scaling * 10;
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FValue := trunc(aValue / Scaling);
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end
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else
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FValue := trunc(aValue);
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// writeln('Adjusted ',Value,' to ',Result);
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end;
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constructor TFBNumeric.Create(aValue: Currency);
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begin
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inherited Create;
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Move(aValue,FValue,sizeof(Int64));
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FScale := -4;
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end;
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constructor TFBNumeric.Create(aValue: TBCD);
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var ScaledBCD: TBCD;
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begin
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inherited Create;
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FScale := -BCDScale(aValue);
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BCDMultiply(aValue,Power(10,-FScale),ScaledBCD);
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FValue := BCDToInteger(ScaledBCD,true);
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end;
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function TFBNumeric.getRawValue: Int64;
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begin
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Result := FValue;
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end;
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function TFBNumeric.getScale: integer;
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begin
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Result := FScale;
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end;
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function TFBNumeric.clone(aNewScale: integer): IFBNumeric;
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begin
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Result := TFBNumeric.Create(Round(FValue * IntPower(10,FScale-aNewScale)),aNewScale);
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end;
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function TFBNumeric.getAsString: AnsiString;
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var Scaling : AnsiString;
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i: Integer;
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begin
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Result := IntToStr(FValue);
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Scaling := '';
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if FScale > 0 then
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begin
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for i := 1 to FScale do
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Result := Result + '0';
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end
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else
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if FScale < 0 then
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{$IF declared(DefaultFormatSettings)}
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with DefaultFormatSettings do
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{$ELSE}
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{$IF declared(FormatSettings)}
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with FormatSettings do
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{$IFEND}
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{$IFEND}
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begin
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if Length(Result) > -FScale then
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system.Insert(DecimalSeparator,Result,Length(Result) + FScale+1)
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else
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begin
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Scaling := '0' + DecimalSeparator;
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for i := -1 downto FScale + Length(Result) do
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Scaling := Scaling + '0';
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if FValue < 0 then
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system.insert(Scaling,Result,2)
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else
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Result := Scaling + Result;
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end;
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end;
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end;
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function TFBNumeric.getAsDouble: double;
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begin
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Result := NumericToDouble(FValue,FScale);
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end;
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function TFBNumeric.getAsCurrency: Currency;
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var value: int64;
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begin
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if FScale <> -4 then
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begin
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value := clone(-4).GetRawValue;
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Move(value,Result,sizeof(Currency));
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end
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else
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Move(FValue,Result,sizeof(Currency));
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end;
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(*var
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Scaling : Int64;
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i : Integer;
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FractionText, PadText, CurrText: AnsiString;
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begin
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Result := 0;
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Scaling := 1;
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PadText := '';
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if FScale > 0 then
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begin
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for i := 1 to FScale do
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Scaling := Scaling * 10;
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result := FValue * Scaling;
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end
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else
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if FScale < 0 then
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begin
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for i := -1 downto FScale do
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Scaling := Scaling * 10;
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FractionText := IntToStr(abs(FValue mod Scaling));
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for i := Length(FractionText) to -FScale -1 do
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PadText := '0' + PadText;
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413 |
{$IF declared(DefaultFormatSettings)}
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414 |
with DefaultFormatSettings do
|
415 |
{$ELSE}
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416 |
{$IF declared(FormatSettings)}
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417 |
with FormatSettings do
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418 |
{$IFEND}
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419 |
{$IFEND}
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420 |
if FValue < 0 then
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421 |
CurrText := '-' + IntToStr(Abs(FValue div Scaling)) + DecimalSeparator + PadText + FractionText
|
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else
|
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CurrText := IntToStr(Abs(FValue div Scaling)) + DecimalSeparator + PadText + FractionText;
|
424 |
try
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425 |
result := StrToCurr(CurrText);
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426 |
except
|
427 |
on E: Exception do
|
428 |
IBError(ibxeInvalidDataConversion, [nil]);
|
429 |
end;
|
430 |
end
|
431 |
else
|
432 |
result := FValue;
|
433 |
end; *)
|
434 |
|
435 |
function TFBNumeric.getAsBCD: TBCD;
|
436 |
begin
|
437 |
Result := DoubleToBCD(getAsDouble);
|
438 |
end;
|
439 |
|
440 |
function TFBNumeric.getAsInt64: Int64;
|
441 |
var
|
442 |
Scaling : Int64;
|
443 |
i: Integer;
|
444 |
Val: Int64;
|
445 |
begin
|
446 |
Scaling := 1;
|
447 |
Val := FValue;
|
448 |
if FScale > 0 then begin
|
449 |
for i := 1 to FScale do Scaling := Scaling * 10;
|
450 |
result := Val * Scaling;
|
451 |
end else if FScale < 0 then begin
|
452 |
for i := -1 downto FScale do Scaling := Scaling * 10;
|
453 |
result := Val div Scaling;
|
454 |
end else
|
455 |
result := Val;
|
456 |
end;
|
457 |
|
458 |
function TFBNumeric.getAsInteger: integer;
|
459 |
begin
|
460 |
Result := SafeInteger(getAsInt64);
|
461 |
end;
|
462 |
|
463 |
function TFBNumeric.getAsSmallInt: SmallInt;
|
464 |
begin
|
465 |
Result := SafeSmallInt(getAsInt64);
|
466 |
end;
|
467 |
|
468 |
end.
|
469 |
|