129 lines
2.6 KiB
Go
129 lines
2.6 KiB
Go
package gofakeit
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import (
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"math/rand"
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"strconv"
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"unicode"
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)
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const cusipStr = upperStr + numericStr
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// CUSIP
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func Cusip() string {
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return cusip(globalFaker.Rand)
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}
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func (f *Faker) Cusip() string {
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return cusip(f.Rand)
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}
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func cusip(r *rand.Rand) string {
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cusipBytes := make([]byte, 8)
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for i := 0; i < len(cusipBytes); i++ {
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cusipBytes[i] = byte(cusipStr[r.Intn(len(cusipStr))])
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}
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baseCusip := string(cusipBytes)
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chkDigit := cusipChecksumDigit(baseCusip)
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return baseCusip + chkDigit
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}
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// ISIN
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func Isin() string {
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return isin(globalFaker.Rand)
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}
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func (f *Faker) Isin() string {
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return isin(f.Rand)
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}
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func isin(r *rand.Rand) string {
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countryCode := CountryAbr()
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nsin := cusip(r)
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isinChkDig := isinChecksumDigit(countryCode + nsin)
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return countryCode + nsin + isinChkDig
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}
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// cusipChecksumDigit returns the checksum digit for a CUSIP
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func cusipChecksumDigit(cusip string) string {
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sum := 0
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for i, c := range cusip {
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v := 0
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if unicode.IsDigit(c) {
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v = int(c - '0')
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}
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if unicode.IsLetter(c) {
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//0-indexed ordinal position of Letter + 10
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v = int(c-'A') + 10
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}
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if i%2 != 0 {
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// Multiply odd digits by two
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v = v * 2
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}
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sum = sum + int(v/10) + v%10
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}
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return strconv.Itoa((10 - (sum % 10)) % 10)
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}
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// isinChecksumDigit returns the checksum digit for an ISIN
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func isinChecksumDigit(isin string) string {
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isinDigits := make([]int, 0)
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for _, c := range isin {
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if unicode.IsLetter(c) {
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letterVal := int(c) - 55
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// Each digit is added as a separate value
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isinDigits = append(isinDigits, letterVal/10)
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isinDigits = append(isinDigits, letterVal%10)
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}
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if unicode.IsDigit(c) {
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isinDigits = append(isinDigits, int(c-'0'))
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}
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}
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oddSum := 0
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evenSum := 0
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// Take the per digit sum of the digitized ISIN, doubling even indexed digits
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for i, d := range isinDigits {
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if i%2 == 0 {
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elem := 2 * d
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if elem > 9 {
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// If the element now has two digits, sum those digits
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elem = (elem % 10) + (elem / 10)
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}
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evenSum += elem
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} else {
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oddSum += d
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}
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}
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return strconv.Itoa((10 - (oddSum+evenSum)%10) % 10)
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}
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// Lookup Adds
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func addFinanceLookup() {
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AddFuncLookup("cusip", Info{
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Display: "CUSIP",
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Category: "finance",
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Description: "Random CUSIP",
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Example: "38259P508",
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Output: "string",
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Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
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return cusip(r), nil
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},
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})
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AddFuncLookup("isin", Info{
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Display: "ISIN",
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Category: "finance",
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Description: "Random ISIN",
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Example: "",
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Output: "string",
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Generate: func(r *rand.Rand, m *MapParams, info *Info) (interface{}, error) {
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return isin(r), nil
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},
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})
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}
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