groovy cusips

Some sample code for verifying cusips


// Note must map these character specifically since ascii mapping does not work
//println "*#@ = "+((int)('*'-'A'))+", "+((int)('#'-'A'))+", "+((int)('@'-'A'))

// sample cusips taken from http://www.ksvali.com/2009/02/security-ids-symbol-cusip-isin-sedol-ric-code/
def cusips = [  "14149YAR9", // - Corporate Bond - Cardinal Health Inc
                "126650BG4", // - Corporate Bond -CVS Caremark Corp
                "254709AC2", // - Corporate Bond -Discover Finl Services
                "437076AQ5", // - Corporate Bond -Home Depot Inc
                "441060AG5", // - Corporate Bond -Hospira Inc
                "50075NAN4", // - Corporate Bond -Kraft Foods Inc
                "574599BE5", // - Corporate Bond -Masco Corp
                "617446B99", // - Corporate Bond -Morgan Stanley
                "637640AC7", // - Corporate Bond -Natl Semicon Corp
                "713291AL6", // - Corporate Bond -Pepco Hldgs Inc
                "852061AE0", // - Corporate Bond -Sprint Nextel Corp
                "887317AA3", // - Corporate Bond -Time Warner Inc
                "925524BF6", // - Corporate Bond -Viacom
                "125509BG3", // - Corporate Bond -Cigna Corp
                "125896AV2"] // - Corporate Bond -CMS Engy Corp

cusips.each(){
    println "Verifying $it "+verifyCusip(it)   
}

public boolean verifyCusip(cusip){
   int check = getCheckCode(cusip.trim().toUpperCase())
   //println "  CheckCode = "+check)
   //println "Checking $check == "+cusip.charAt(cusip.size()-1)
   return check==((int)cusip.charAt(cusip.size()-1)-(int)'0')
}

/**
 *Code based on algorithm at https://en.wikipedia.org/wiki/CUSIP
 */
public int getCheckCode(String cusip){
   int sum = 0
   int v,p
   for(i=0;i<8;i++){
      char c = cusip.charAt(i)
      if(Character.isDigit(c))
         v = (int)c-(int)'0'
      else if(Character.isLetter(c))
         v = (int)c - (int)'A'+10
      else if(c == '*')
         v = 36
      else if(c == '@')
         v = 37
      else if(c == '#')
         v = 38
      if(i%2!=0) // if i NOT even   N.B. since we count from 0 it is not even.. If we count from 1 it is even
         v *= 2
      //println "  for letter $c val = $v"
      sum += v/10 + (v %10)
   }
  
   return (10 - (sum % 10)) % 10
}