CheckDigits::M10_008(3) compute check digits for Sedol (GB)

## SYNOPSIS

use Algorithm::CheckDigits;
\$sedol = CheckDigits('sedol');
if (\$sedol->is_valid('0123457')) {
# do something
}
\$cn = \$sedol->complete('012345');
# \$cn = '0123457'
\$cd = \$sedol->checkdigit('0123457');
# \$cd = '7'
\$bn = \$sedol->basenumber('0123457');
# \$bn = '012345'

## ALGORITHM

1.
Beginning left all numbers are weighted with 1,3,1,7,3,9 and 1 (checkdigit)
2.
3.
The check digit is the difference of the sum from step 3 to the next multiple of 10.

## METHODS

is_valid(\$number)
Returns true only if \$number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.

Returns false otherwise,

complete(\$number)
The check digit for \$number is computed and concatenated to the end of \$number.

Returns the complete number with check digit or '' if \$number does not consist solely of digits and spaces.

basenumber(\$number)
Returns the basenumber of \$number if \$number has a valid check digit.

Return '' otherwise.

checkdigit(\$number)
Returns the checkdigit of \$number if \$number has a valid check digit.

Return '' otherwise.

None by default.

## AUTHOR

Mathias Weidner, <[email protected]>