129 lines
3.3 KiB
JavaScript
129 lines
3.3 KiB
JavaScript
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//
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// format - printf-like string formatting for JavaScript
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// github.com/samsonjs/format
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// @_sjs
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//
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// Copyright 2010 - 2013 Sami Samhuri <sami@samhuri.net>
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//
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// MIT License
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// http://sjs.mit-license.org
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//
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;(function() {
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//// Export the API
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var namespace;
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// CommonJS / Node module
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if (typeof module !== 'undefined') {
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namespace = module.exports = format;
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}
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// Browsers and other environments
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else {
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// Get the global object. Works in ES3, ES5, and ES5 strict mode.
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namespace = (function(){ return this || (1,eval)('this') }());
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}
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namespace.format = format;
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namespace.vsprintf = vsprintf;
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if (typeof console !== 'undefined' && typeof console.log === 'function') {
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namespace.printf = printf;
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}
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function printf(/* ... */) {
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console.log(format.apply(null, arguments));
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}
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function vsprintf(fmt, replacements) {
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return format.apply(null, [fmt].concat(replacements));
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}
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function format(fmt) {
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var argIndex = 1 // skip initial format argument
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, args = [].slice.call(arguments)
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, i = 0
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, n = fmt.length
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, result = ''
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, c
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, escaped = false
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, arg
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, tmp
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, leadingZero = false
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, precision
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, nextArg = function() { return args[argIndex++]; }
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, slurpNumber = function() {
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var digits = '';
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while (/\d/.test(fmt[i])) {
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digits += fmt[i++];
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c = fmt[i];
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}
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return digits.length > 0 ? parseInt(digits) : null;
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}
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;
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for (; i < n; ++i) {
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c = fmt[i];
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if (escaped) {
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escaped = false;
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if (c == '.') {
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leadingZero = false;
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c = fmt[++i];
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}
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else if (c == '0' && fmt[i + 1] == '.') {
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leadingZero = true;
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i += 2;
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c = fmt[i];
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}
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else {
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leadingZero = true;
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}
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precision = slurpNumber();
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switch (c) {
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case 'b': // number in binary
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result += parseInt(nextArg(), 10).toString(2);
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break;
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case 'c': // character
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arg = nextArg();
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if (typeof arg === 'string' || arg instanceof String)
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result += arg;
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else
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result += String.fromCharCode(parseInt(arg, 10));
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break;
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case 'd': // number in decimal
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result += parseInt(nextArg(), 10);
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break;
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case 'f': // floating point number
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tmp = String(parseFloat(nextArg()).toFixed(precision || 6));
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result += leadingZero ? tmp : tmp.replace(/^0/, '');
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break;
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case 'j': // JSON
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result += JSON.stringify(nextArg());
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break;
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case 'o': // number in octal
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result += '0' + parseInt(nextArg(), 10).toString(8);
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break;
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case 's': // string
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result += nextArg();
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break;
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case 'x': // lowercase hexadecimal
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result += '0x' + parseInt(nextArg(), 10).toString(16);
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break;
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case 'X': // uppercase hexadecimal
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result += '0x' + parseInt(nextArg(), 10).toString(16).toUpperCase();
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break;
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default:
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result += c;
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break;
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}
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} else if (c === '%') {
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escaped = true;
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} else {
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result += c;
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}
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}
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return result;
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}
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}());
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