/**
sprintf() for JavaScript 0.6

Copyright (c) Alexandru Marasteanu <alexaholic [at) gmail (dot] com>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of sprintf() for JavaScript nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

Downloaded from: http://www.diveintojavascript.com/projects/javascript-sprintf

**/
function str_repeat(i, m) {
  for (var o = []; m > 0; o[--m] = i);
  return o.join('');
}

function sprintf() {
  var i = 0, a, f = arguments[i++], o = [], m, p, c, x, s = '';
  while (f) {
    if (m = /^[^\x25]+/.exec(f)) {
      o.push(m[0]);
    }
    else if (m = /^\x25{2}/.exec(f)) {
      o.push('%');
    }
    else if (m = /^\x25(?:(\d+)\$)?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(f)) {
      if (((a = arguments[m[1] || i++]) == null) || (a == undefined)) {
        throw('Too few arguments.');
      }
      if (/[^s]/.test(m[7]) && (typeof(a) != 'number')) {
        throw('Expecting number but found ' + typeof(a));
      }
      switch (m[7]) {
        case 'b': a = a.toString(2); break;
        case 'c': a = String.fromCharCode(a); break;
        case 'd': a = parseInt(a); break;
        case 'e': a = m[6] ? a.toExponential(m[6]) : a.toExponential(); break;
        case 'f': a = m[6] ? parseFloat(a).toFixed(m[6]) : parseFloat(a); break;
        case 'o': a = a.toString(8); break;
        case 's': a = ((a = String(a)) && m[6] ? a.substring(0, m[6]) : a); break;
        case 'u': a = Math.abs(a); break;
        case 'x': a = a.toString(16); break;
        case 'X': a = a.toString(16).toUpperCase(); break;
      }
      a = (/[def]/.test(m[7]) && m[2] && a >= 0 ? '+'+ a : a);
      c = m[3] ? m[3] == '0' ? '0' : m[3].charAt(1) : ' ';
      x = m[5] - String(a).length - s.length;
      p = m[5] ? str_repeat(c, x) : '';
      o.push(s + (m[4] ? a + p : p + a));
    }
    else {
      throw('Huh ?!');
    }
    f = f.substring(m[0].length);
  }
  return o.join('');
}