/*
**  sprintf.js -- POSIX sprintf(3) style formatting function for JavaScript
**  Copyright (c) 2006-2007 Ralf S. Engelschall <rse@engelschall.com>
**  Partly based on Public Domain code by Jan Moesen <http://jan.moesen.nu/>
**  Licensed under GPL <http://www.gnu.org/licenses/gpl.txt>
**
**  $LastChangedDate$
**  $LastChangedRevision$
*/

/*  make sure the ECMAScript 3.0 Number.toFixed() method is available  */
if (typeof Number.prototype.toFixed != "undefined") {
    (function(){
        /*  see http://www.jibbering.com/faq/#FAQ4_6 for details  */
        function Stretch(Q, L, c) {
            var S = Q
            if (c.length > 0)
                while (S.length < L)
                    S = c+S;
            return S;
        }
        function StrU(X, M, N) { /* X >= 0.0 */
            var T, S;
            S = new String(Math.round(X * Number("1e"+N)));
            if (S.search && S.search(/\D/) != -1)
                return ''+X;
            with (new String(Stretch(S, M+N, '0')))
                return substring(0, T=(length-N)) + '.' + substring(T);
        }
        function Sign(X) {
            return X < 0 ? '-' : '';
        }
        function StrS(X, M, N) {
            return Sign(X)+StrU(Math.abs(X), M, N);
        }
        Number.prototype.toFixed = function (n) { return StrS(this, 1, n) };
    })();
}

/*  the sprintf() function  */
sprintf = function () {
    /*  argument sanity checking  */
    if (!arguments || arguments.length < 1)
        alert("sprintf:ERROR: not enough arguments");

    /*  initialize processing queue  */
    var argumentnum = 0;
    var done = "", todo = arguments[argumentnum++];

    /*  parse still to be done format string  */
    var m;
    while (m = /^([^%]*)%(\d+$)?([#0 +'-]+)?(\*|\d+)?(\.\*|\.\d+)?([%diouxXfFcs])(.*)$/.exec(todo)) {
        var pProlog    = m[1],
            pAccess    = m[2],
            pFlags     = m[3],
            pMinLength = m[4],
            pPrecision = m[5],
            pType      = m[6],
            pEpilog    = m[7];

        /*  determine substitution  */
        var subst;
        if (pType == '%')
            /*  special case: escaped percent character  */
            subst = '%';
        else {
            /*  parse padding and justify aspects of flags  */
            var padWith = ' ';
            var justifyRight = true;
            if (pFlags) {
                if (pFlags.indexOf('0') >= 0)
                    padWith = '0';
                if (pFlags.indexOf('-') >= 0) {
                    padWith = ' ';
                    justifyRight = false;
                }
            }
            else
                pFlags = "";

            /*  determine minimum length  */
            var minLength = -1;
            if (pMinLength) {
                if (pMinLength == "*") {
                    var access = argumentnum++;
                    if (access >= arguments.length)
                        alert("sprintf:ERROR: not enough arguments");
                    minLength = arguments[access];
                }
                else
                    minLength = parseInt(pMinLength, 10);
            }

            /*  determine precision  */
            var precision = -1;
            if (pPrecision) {
                if (pPrecision == ".*") {
                    var access = argumentnum++;
                    if (access >= arguments.length)
                        alert("sprintf:ERROR: not enough arguments");
                    precision = arguments[access];
                }
                else
                    precision = parseInt(pPrecision.substring(1), 10);
            }

            /*  determine how to fetch argument  */
            var access = argumentnum++;
            if (pAccess)
                access = parseInt(pAccess.substring(0, pAccess.length - 1), 10);
            if (access >= arguments.length)
                alert("sprintf:ERROR: not enough arguments");

            /*  dispatch into expansions according to type  */
            var prefix = "";
            switch (pType) {
                case 'd':
                case 'i':
                    subst = arguments[access];
                    if (typeof subst != "number")
                        subst = 0;
                    subst = subst.toString(10);
                    if (pFlags.indexOf('#') >= 0 && subst >= 0)
                        subst = "+" + subst;
                    if (pFlags.indexOf(' ') >= 0 && subst >= 0)
                        subst = " " + subst;
                    break;
                case 'o':
                    subst = arguments[access];
                    if (typeof subst != "number")
                        subst = 0;
                    subst = subst.toString(8);
                    break;
                case 'u':
                    subst = arguments[access];
                    if (typeof subst != "number")
                        subst = 0;
                    subst = Math.abs(subst);
                    subst = subst.toString(10);
                    break;
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