Validate International Securities Identification Number: Difference between revisions
Validate International Securities Identification Number (view source)
Revision as of 09:06, 1 June 2023
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AU0000VXGZA3 is valid
FR0000988040 is valid</pre>
=={{header|Delphi}}==
{{works with|Delphi|6.0}}
{{libheader|SysUtils,StdCtrls}}
<syntaxhighlight lang="Delphi">
function StrToBase10(S: string): TByteDynArray;
{Convert ASCII string to Base-10}
{ASCII Digits converted to integer 0..9 }
{ASCII Chars convert to bytes "A"=10, "B"=11, etc }
var I: Integer;
var B: byte;
procedure StoreByte(B: byte);
begin
SetLength(Result,Length(Result)+1);
Result[High(Result)]:=B;
end;
begin
SetLength(Result,0);
for I:=1 to Length(S) do
begin
if S[I] in ['0'..'9'] then StoreByte(Byte(S[I])-$30)
else
begin
B:=(Byte(S[I])-$41)+10;
StoreByte(B div 10);
StoreByte(B mod 10);
end;
end;
end;
{Simplifies cases where we have to sum a two digit number}
const DigitSum: array [0..18] of byte = (0,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9);
function LuhnTest(Nums: array of byte): boolean;
{Perform Luhn Test of byte array}
var I,J,Len,Sum,Sum1,Sum2: integer;
var Rev: array of byte;
begin
Sum1:=0; Sum2:=0;
Len:=High(Nums);
for I:=Len downto 0 do
if ((I-Len) and 1)=0 then Sum1:=Sum1 + Nums[I]
else Sum2:=Sum2 + DigitSum[Nums[I]*2];
Sum:=Sum1+Sum2;
Result:=(Sum mod 10)=0;
end;
{String error types}
type TStringErrors = (seNone,seLength,seCountry);
function ValidateStr(IDStr: string): TStringErrors;
{Validate string checking for incorrectly length}
{And invalid country code}
begin
if Length(IDStr)<>12 then Result:=seLength
else if not (IDStr[1] in ['a'..'z','A'..'Z']) or
not (IDStr[2] in ['a'..'z','A'..'Z']) then Result:=seCountry
else Result:=seNone;
end;
procedure ValidateID(Memo: TMemo; IDStr: string);
{Validate and display status of string}
var BA: TByteDynArray;
var LT: boolean;
var SE: TStringErrors;
var S: string;
begin
SE:=ValidateStr(IDStr);
BA:=StrToBase10(IDStr);
LT:=LuhnTest(BA);
if LT and (SE=seNone) then Memo.Lines.Add(IDStr+': Valid')
else
begin
S:=IDStr+': Invalid';
if not LT then S:=S+', Luhn Error';
case SE of
seLength: S:=S+', Length Error';
seCountry: S:=S+', Country Code Error';
end;
Memo.Lines.Add(S);
end;
end;
procedure ValidateSecuritiesID(Memo: TMemo);
var BA: TByteDynArray;
var I: integer;
var S: string;
begin
ValidateID(Memo,'US0378331005');
ValidateID(Memo,'US0373831005');
ValidateID(Memo,'U50378331005');
ValidateID(Memo,'US03378331005');
ValidateID(Memo,'AU0000XVGZA3');
ValidateID(Memo,'AU0000VXGZA3');
ValidateID(Memo,'FR0000988040');
end;
</syntaxhighlight>
{{out}}
<pre>
US0378331005: Valid
US0373831005: Invalid, Luhn Error
U50378331005: Invalid, Country Code Error
US03378331005: Invalid, Length Error
AU0000XVGZA3: Valid
AU0000VXGZA3: Valid
FR0000988040: Valid
Elapsed Time: 6.863 ms.
</pre>
=={{header|Elixir}}==
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