first checker script

isbn_checker.rb

@@ -0,0 +1,155 @@
+#!/usr/bin/ruby
+
+class Isbn_checker
+  def verify_checkDigit(isbn_in, printValids)
+    if isbn_in.length == 13
+      return verify_checkDigit13(isbn_in.upcase, printValids)
+    elsif isbn_in.length == 10
+      return verify_checkDigit10(isbn_in.upcase, printValids)
+    else
+      return nil
+    end
+  end
+
+  def verify_checkDigit10(isbn_in, printValids)
+    retVal = false
+    if (isbn_in.length == 10) 
+      chkDgtX = calc_checkDigit10(isbn_in[0,isbn_in.length-1])
+      #puts "chkDgtX = #{chkDgtX}; isbn_in = #{isbn_in}; isbn(substr) = #{isbn_in[0,isbn_in.length-1]}"
+      if isbn_in == isbn_in[0,isbn_in.length-1].to_s + chkDgtX.to_s.upcase
+	retVal=true
+	if printValids
+	  puts "valid check digit found in isbn #{isbn_in}!"
+	end
+      else
+	puts "INVALID check digit in isbn #{isbn_in}!"
+      end
+    else
+      puts "invalid isbn_in length (#{isbn_in.length})"
+    end
+    retVal
+  end
+
+  def verify_checkDigit13(isbn_in, printValids)
+    retVal = false
+    if (isbn_in.length == 13) 
+      chkDgt = calc_checkDigit13(isbn_in[0,isbn_in.length-1])
+      #puts "chkDgt = #{chkDgt}; isbn_in = #{isbn_in}; isbn(substr) = #{isbn_in[0,isbn_in.length-1]}"
+      if isbn_in == isbn_in[0,isbn_in.length-1].to_s + chkDgt.to_s
+	retVal=true
+	if printValids
+	  puts "valid check digit found in isbn #{isbn_in}!"
+	end
+      else
+	puts "INVALID check digit in isbn #{isbn_in}!"
+      end
+    else
+      puts "invalid isbn_in length (#{isbn_in.length})"
+    end
+    retVal
+  end
+
+  def calc_checkDigit(isbn_in)
+    if isbn_in.length == 13
+      return calc_checkDigit13(isbn_in)
+    elsif isbn_in.length == 10
+      return calc_checkDigit10(isbn_in)
+    else
+      return nil
+    end
+  end
+
+  def calc_checkDigit10(isbn_in)
+    charPos = 0
+    csumTotal = 0
+    iarr = isbn_in.split(//)
+    for i2 in iarr
+      charPos += 1
+      csumTotal = csumTotal + (charPos * i2.to_i)
+      #puts "csumTotal (running) = #{csumTotal}"
+    end
+    #puts "csumTotal = #{csumTotal}"
+    checkDigit = csumTotal % 11
+    if (checkDigit == 10)
+      checkDigit = "X"
+    end
+    #puts "for partial isbn #{isbn_in} the checkDigit = #{checkDigit}; complete isbn = #{isbn_in}#{checkDigit}"
+    checkDigit
+  end
+
+  def calc_checkDigit13(isbn_in)
+    charPos = 0
+    csumTotal = 0
+    iarr = isbn_in.split(//)
+    for i1 in iarr
+      cP2 = charPos/2.to_f
+      #puts "#{cP2}; #{cP2.round}; #{cP2.floor}"
+
+      if (cP2.round == cP2.floor)
+	csumTotal = csumTotal + i1.to_i
+	#puts "csumTotal_a = #{csumTotal} + #{i1.to_i}"
+      else
+	csumTotal = csumTotal + (3*i1.to_i)
+	#puts "csumTotal_b = #{csumTotal} + #{3*i1.to_i}"
+      end      
+      charPos += 1
+    end
+      #puts "csumTotal = #{csumTotal}"
+      if (csumTotal == (csumTotal/10.to_i)*10)
+	checkDigit = "0"
+      else
+	checkDigit = 10-(csumTotal - (csumTotal/10.to_i)*10)
+      end
+
+      #puts "checkDigit = 10-(#{csumTotal} - #{(csumTotal/10.to_i)*10})"
+      if (checkDigit == 10)
+	checkDigit = "X"
+      end
+      #puts "for partial isbn #{isbn_in} the checkDigit = #{checkDigit}; complete isbn = #{isbn_in}#{checkDigit}"
+      checkDigit
+  end
+
+  def fix_isbn(isbn)  
+    return isbn[0,isbn.length-1] + calc_checkDigit(isbn).to_s
+  end
+
+  def check_isbnFile(filename)
+    isbns_checked = isbns_valid = isbns_invalid = 0
+
+    File.open(filename, "r") do |f|
+      f.each { |isbn|
+        isbn = isbn.chomp
+	if verify_checkDigit(isbn, false) == false
+	  puts "#{isbn} is invalid; proper ISBN should be " + fix_isbn(isbn)
+          isbns_invalid +=1
+        else
+	  isbns_valid+=1
+        end
+        isbns_checked += 1
+      }
+    end
+    puts "checked #{isbns_checked} isbns; #{isbns_invalid} invalid (#{(isbns_invalid/isbns_checked)*100.round}%) & #{isbns_valid} valid (#{(isbns_valid/isbns_checked)*100.round}%)"
+  end
+
+  def initialize()
+  end
+
+  def new
+  end
+end
+
+i1 = Isbn_checker.new
+#i1.calc_checkDigit("978159995168")
+#i1.verify_checkDigit("9781599951683")
+#i1.verify_checkDigit("9780802825285")
+#i1.verify_checkDigit("9780802823151")
+#i1.verify_checkDigit("9780802825155")
+#puts i1.calc_checkDigit("978080282515")
+#i1.verify_checkDigit("9780060738174")
+#i1.verify_checkDigit("0192815245")
+#i1.verify_checkDigit("014044131x")
+
+#i1.check_isbnFile("/home/john/Dropbox/books/JDL-isbns.txt")
+#i1.check_isbnFile("/home/john/Dropbox/books/JDL-isbns-2.txt")
+#i1.check_isbnFile("/home/john/Dropbox/books/JDL-isbns-3.txt")
+i1.check_isbnFile("/home/john/Dropbox/books/JDL-isbns-consolidated-20100816.txt")