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‎src/sprintf.js

Lines changed: 89 additions & 51 deletions
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/**
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* sprintf() for JavaScript v.0.4
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*
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* Copyright (c) 2007 Alexandru Marasteanu <http://alexei.417.ro/>
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* Thanks to David Baird (unit test and patch).
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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sprintf() for JavaScript 0.5
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function str_repeat(i, m) { for (var o = []; m > 0; o[--m] = i); return(o.join('')); }
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Copyright (c) Alexandru Marasteanu <alexaholic [at) gmail (dot] com>
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All rights reserved.
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function sprintf () {
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var i = 0, a, f = arguments[i++], o = [], m, p, c, x;
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while (f) {
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if (m = /^[^\x25]+/.exec(f)) o.push(m[0]);
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else if (m = /^\x25{2}/.exec(f)) o.push('%');
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else if (m = /^\x25(?:(\d+)\$)?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(f)) {
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if (((a = arguments[m[1] || i++]) == null) || (a == undefined)) throw("Too few arguments.");
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if (/[^s]/.test(m[7]) && (typeof(a) != 'number'))
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throw("Expecting number but found " + typeof(a));
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switch (m[7]) {
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case 'b': a = a.toString(2); break;
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case 'c': a = String.fromCharCode(a); break;
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case 'd': a = parseInt(a); break;
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case 'e': a = m[6] ? a.toExponential(m[6]) : a.toExponential(); break;
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case 'f': a = m[6] ? parseFloat(a).toFixed(m[6]) : parseFloat(a); break;
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case 'o': a = a.toString(8); break;
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case 's': a = ((a = String(a)) && m[6] ? a.substring(0, m[6]) : a); break;
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case 'u': a = Math.abs(a); break;
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case 'x': a = a.toString(16); break;
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case 'X': a = a.toString(16).toUpperCase(); break;
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}
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a = (/[def]/.test(m[7]) && m[2] && a > 0 ? '+' + a : a);
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c = m[3] ? m[3] == '0' ? '0' : m[3].charAt(1) : ' ';
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x = m[5] - String(a).length;
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p = m[5] ? str_repeat(c, x) : '';
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o.push(m[4] ? a + p : p + a);
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}
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else throw ("Huh ?!");
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f = f.substring(m[0].length);
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}
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return o.join('');
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of sprintf() for JavaScript nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL Alexandru Marasteanu BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Changelog:
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2007.04.03 - 0.1:
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- initial release
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2007.09.11 - 0.2:
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- feature: added argument swapping
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2007.09.17 - 0.3:
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- bug fix: no longer throws exception on empty paramenters (Hans Pufal)
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2007.10.21 - 0.4:
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- unit test and patch (David Baird)
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2010.05.09 - 0.5:
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- bug fix: 0 is now preceeded with a + sign
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- bug fix: the sign was not at the right position on padded results (Kamal Abdali)
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- switched from GPL to BSD license
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**/
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function str_repeat(i, m) {
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for (var o = []; m > 0; o[--m] = i);
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return(o.join(""));
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}
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function sprintf() {
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var i = 0, a, f = arguments[i++], o = [], m, p, c, x, s = '';
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while (f) {
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if (m = /^[^\x25]+/.exec(f)) {
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o.push(m[0]);
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}
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else if (m = /^\x25{2}/.exec(f)) {
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o.push("%");
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}
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else if (m = /^\x25(?:(\d+)\$)?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(f)) {
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if (((a = arguments[m[1] || i++]) == null) || (a == undefined)) {
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throw("Too few arguments.");
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}
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if (/[^s]/.test(m[7]) && (typeof(a) != "number")) {
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throw("Expecting number but found " + typeof(a));
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}
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switch (m[7]) {
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case 'b': a = a.toString(2); break;
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case 'c': a = String.fromCharCode(a); break;
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case 'd': a = parseInt(a); break;
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case 'e': a = m[6] ? a.toExponential(m[6]) : a.toExponential(); break;
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case 'f': a = m[6] ? parseFloat(a).toFixed(m[6]) : parseFloat(a); break;
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case 'o': a = a.toString(8); break;
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case 's': a = ((a = String(a)) && m[6] ? a.substring(0, m[6]) : a); break;
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case 'u': a = Math.abs(a); break;
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case 'x': a = a.toString(16); break;
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case 'X': a = a.toString(16).toUpperCase(); break;
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}
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if (/[def]/.test(m[7])) {
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s = (a >= 0 ? (m[2] ? '+' : '') : '-');
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a = Math.abs(a);
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}
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c = m[3] ? m[3] == '0' ? '0' : m[3].charAt(1) : ' ';
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x = m[5] - String(a).length - s.length;
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p = m[5] ? str_repeat(c, x) : '';
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o.push(s + (m[4] ? a + p : p + a));
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}
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else {
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throw("Huh ?!");
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}
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f = f.substring(m[0].length);
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}
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return o.join("");
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}

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