/**
 * sprintf() for JavaScript v.0.4
 *
 * Copyright (c) 2007 Alexandru Marasteanu <http://alexei.417.ro/>
 * Thanks to David Baird (unit test and patch).
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */

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;
	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;
			p = m[5] ? str_repeat(c, x) : '';
			o.push(m[4] ? a + p : p + a);
		}
		else
			throw ("Huh ?!");

		f = f.substring(m[0].length);
	}

	return o.join('');
}