source: source/sprintf.js @ 69:1cdffcc41a1d

/**
 * sprintf() for JavaScript v.0.1
 *
 * Copyright (c) 2007 Alexandru Marasteanu <http://alexei.417.ro/>
 *
 * 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, f = arguments[i++], o = [], m, a, p;
        while (f) {
                if (m = /^[^\x25]+/.exec(f)) o.push(m[0]);
                else if (m = /^\x25{2}/.exec(f)) o.push('%');
                else if (m = /^\x25(\+)?(0|'[^$])?(-)?(\d+)?(\.\d+)?([b-fosuxX])/.exec(f)) {
                        if (!(a = arguments[i++])) throw("Too few arguments.");
                        if (/[^s]/.test(m[6]) && (typeof(a) != 'number'))
                                throw("Expecting number but found " + typeof(a));
                        switch (m[6]) {
                                case 'b': a = a.toString(2); break;
                                case 'c': a = String.fromCharCode(a); break;
                                case 'd': a = parseInt(a); break;
                                case 'e': a = m[5] ? a.toExponential(m[5].charAt(1)) : a.toExponential(); break;
                                case 'f': a = m[5] ? parseFloat(a).toFixed(m[5].charAt(1)) : parseFloat(a); break;
                                case 'o': a = a.toString(8); break;
                                case 's': a = ((a = String(a)) && m[5] ? a.substring(0, m[5].charAt(1)) : 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[6]) && m[1] && a > 0 ? '+' + a : a);
                        p = m[4] ? str_repeat(m[2] ? m[2] == '0' ? '0' : m[2].charAt(1) : ' ', m[5] ? m[4] - String(a).length : m[4]) : '';
                        o.push(m[3] ? a + p : p + a);
                } else throw("Huh ?");
                f = f.substring(m[0].length);
        }
        return(o.join(''));
}