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if (UltraEdit.document.length > 0) { // Is any file opened?

   // Define environment for this script.
   UltraEdit.insertMode();
   UltraEdit.columnModeOff();
   UltraEdit.activeDocument.hexOff();
   UltraEdit.ueReOn();

   /* Verify the line termination of the last line of the file
      and insert one if the last line has no line termination. */
   UltraEdit.activeDocument.bottom();
   if (UltraEdit.activeDocument.isColNumGt(1)) {
      UltraEdit.activeDocument.insertLine();
      if (UltraEdit.activeDocument.isColNumGt(1)) {
         UltraEdit.activeDocument.deleteToStartOfLine();
      }
   }
   UltraEdit.activeDocument.top();
   UltraEdit.activeDocument.trimTrailingSpaces();

   // Define line terminator type by default for DOS. If the version of
   // UE/UES has support for the line terminator property, use it to set
   // the line terminator string according to the value of this property.
   var sLineTerm = "\r\n";
   if (typeof(UltraEdit.activeDocument.lineTerminator) == "number") {
      if (UltraEdit.activeDocument.lineTerminator == 1) {
         sLineTerm = "\n";  // UNIX file not converted to DOS.
      }  // Ignore older versions of UltraEdit and MAC files for this
   }     // script and use in all other cases also DOS line terminators.

   UltraEdit.selectClipboard(9);
   // Process entire file in blocks of 10000 lines to end of file.
   var nLineNum = 1;
   do {
      nLineNum += 10000;
      UltraEdit.activeDocument.gotoLineSelect(nLineNum,1);
      if (!UltraEdit.activeDocument.isSel()) break;
      var asLines = UltraEdit.activeDocument.selection.split(sLineTerm);

      // Process each line of the selected block.
      for (var nIndex = 0; nIndex < asLines.length; nIndex++ ) {

         // Find first character of a sequence of colon delimited numbers at end of the line.
         var nNumberPos = asLines[nIndex].search(/(?:\d+:*)+$/);
         // If no number found, for example a blank line, skip the line.
         if (nNumberPos < 0) continue;
         // Split the line into fixed text and the numbers as string.
         var sText = asLines[nIndex].substr(0,nNumberPos);
         var sNumbers = asLines[nIndex].substr(nNumberPos);
         // Split the numbers string up into an array of strings each with a number.
         var asNumbers = sNumbers.split(":");
         // If the line contains only 1 number, nothing to do for this line.
         if (asNumbers == null) continue;

         // Convert the number strings into integers and sum them.
         var nSum = 0;
         for (var nNumber = 0; nNumber < asNumbers.length; nNumber++ ) {
            // Skip empty strings caused by :: between the numbers.
            if (asNumbers[nNumber].length == 0) continue;
            nSum += parseInt(asNumbers[nNumber],10);
         }
         // Build new line with fixed text and the sum converted to a decimal number string.
         asLines[nIndex] = sText + nSum.toString(10);
      }
      // Rebuild the block with the modified lines in user clipboard 9.
      UltraEdit.clipboardContent = asLines.join(sLineTerm);
      // Paste the block over the still selected lines.
      UltraEdit.activeDocument.paste();
   } while (UltraEdit.activeDocument.isEof() == false);

   // Clear user clipboard 9 and select Windows clipboard.
   UltraEdit.clearClipboard();
   UltraEdit.selectClipboard(0);
}