/library/sprintf.js

// args is a pyjslib_List

// str is a String

function sprintf(str, args)

{

   if(args && args.__class__ != "pyjslib_List")

      args = new pyjslib_List([args]);

   if (!args || pyjslib_len(args) < 1 || !RegExp)

   {

      return;

   }

   var re = /([^%]*)%('.|0|\x20)?(-)?(\d+)?(\.\d+)?(%|b|c|d|u|f|o|s|x|X)(.*)/;

   var a = b = [], numSubstitutions = 0, numMatches = 0;

   while (a = re.exec(str))

   {

      var leftpart = a[1], pPad = a[2], pJustify = a[3], pMinLength = a[4];

      var pPrecision = a[5], pType = a[6], rightPart = a[7];

      

      //alert(a + '\n' + [a[0], leftpart, pPad, pJustify, pMinLength, pPrecision);



      numMatches++;

      if (pType == '%')

      {

         subst = '%';

      }

      else

      {

         if (numSubstitutions >= args.length)

         {

            alert('Error! Not enough function args (' + (args.length - 1) + ', excluding the string)\nfor the number of substitution parameters in string (' + numSubstitutions + ' so far).');

         }

         var param = args.__getitem__(numSubstitutions);

         var pad = '';

                if (pPad && pPad.substr(0,1) == "'") pad = leftpart.substr(1,1);

           else if (pPad) pad = pPad;

         var justifyRight = true;

                if (pJustify && pJustify === "-") justifyRight = false;

         var minLength = -1;

                if (pMinLength) minLength = parseInt(pMinLength);

         var precision = -1;

                if (pPrecision && pType == 'f') precision = parseInt(pPrecision.substring(1));

         var subst = param;

                if (pType == 'b') subst = parseInt(param).toString(2);

           else if (pType == 'c') subst = String.fromCharCode(parseInt(param));

           else if (pType == 'd') subst = parseInt(param) ? parseInt(param) : 0;

           else if (pType == 'u') subst = Math.abs(param);

           else if (pType == 'f') subst = (precision > -1) ? Math.round(parseFloat(param) * Math.pow(10, precision)) / Math.pow(10, precision): parseFloat(param);

           else if (pType == 'o') subst = parseInt(param).toString(8);

           else if (pType == 's') subst = param;

           else if (pType == 'x') subst = ('' + parseInt(param).toString(16)).toLowerCase();

           else if (pType == 'X') subst = ('' + parseInt(param).toString(16)).toUpperCase();

         numSubstitutions++;

      }

      str = leftpart + subst + rightPart;

   }

   return str;

}