9 placeholder: /^\x25(?:([1-9]\d*)\$|\(([^\)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-gijosuxX])/,
10 key: /^([a-z_][a-z_\d]*)/i,
11 key_access: /^\.([a-z_][a-z_\d]*)/i,
12 index_access: /^\[(\d+)\]/,
17 var key = arguments[0], cache = sprintf.cache
18 if (!(cache[key] && cache.hasOwnProperty(key))) {
19 cache[key] = sprintf.parse(key)
21 return sprintf.format.call(null, cache[key], arguments)
24 sprintf.format = function(parse_tree, argv) {
25 var cursor = 1, tree_length = parse_tree.length, node_type = "", arg, output = [], i, k, match, pad, pad_character, pad_length, is_positive = true, sign = ""
26 for (i = 0; i < tree_length; i++) {
27 node_type = get_type(parse_tree[i])
28 if (node_type === "string") {
29 output[output.length] = parse_tree[i]
31 else if (node_type === "array") {
32 match = parse_tree[i] // convenience purposes only
33 if (match[2]) { // keyword argument
35 for (k = 0; k < match[2].length; k++) {
36 if (!arg.hasOwnProperty(match[2][k])) {
37 throw new Error(sprintf("[sprintf] property '%s' does not exist", match[2][k]))
39 arg = arg[match[2][k]]
42 else if (match[1]) { // positional argument (explicit)
45 else { // positional argument (implicit)
49 if (get_type(arg) == "function") {
53 if (re.not_string.test(match[8]) && re.not_json.test(match[8]) && (get_type(arg) != "number" && isNaN(arg))) {
54 throw new TypeError(sprintf("[sprintf] expecting number but found %s", get_type(arg)))
57 if (re.number.test(match[8])) {
58 is_positive = arg >= 0
66 arg = String.fromCharCode(arg)
70 arg = parseInt(arg, 10)
73 arg = JSON.stringify(arg, null, match[6] ? parseInt(match[6]) : 0)
76 arg = match[7] ? arg.toExponential(match[7]) : arg.toExponential()
79 arg = match[7] ? parseFloat(arg).toFixed(match[7]) : parseFloat(arg)
82 arg = match[7] ? parseFloat(arg).toPrecision(match[7]) : parseFloat(arg)
88 arg = ((arg = String(arg)) && match[7] ? arg.substring(0, match[7]) : arg)
94 arg = arg.toString(16)
97 arg = arg.toString(16).toUpperCase()
100 if (re.json.test(match[8])) {
101 output[output.length] = arg
104 if (re.number.test(match[8]) && (!is_positive || match[3])) {
105 sign = is_positive ? "+" : "-"
106 arg = arg.toString().replace(re.sign, "")
111 pad_character = match[4] ? match[4] === "0" ? "0" : match[4].charAt(1) : " "
112 pad_length = match[6] - (sign + arg).length
113 pad = match[6] ? (pad_length > 0 ? str_repeat(pad_character, pad_length) : "") : ""
114 output[output.length] = match[5] ? sign + arg + pad : (pad_character === "0" ? sign + pad + arg : pad + sign + arg)
118 return output.join("")
123 sprintf.parse = function(fmt) {
124 var _fmt = fmt, match = [], parse_tree = [], arg_names = 0
126 if ((match = re.text.exec(_fmt)) !== null) {
127 parse_tree[parse_tree.length] = match[0]
129 else if ((match = re.modulo.exec(_fmt)) !== null) {
130 parse_tree[parse_tree.length] = "%"
132 else if ((match = re.placeholder.exec(_fmt)) !== null) {
135 var field_list = [], replacement_field = match[2], field_match = []
136 if ((field_match = re.key.exec(replacement_field)) !== null) {
137 field_list[field_list.length] = field_match[1]
138 while ((replacement_field = replacement_field.substring(field_match[0].length)) !== "") {
139 if ((field_match = re.key_access.exec(replacement_field)) !== null) {
140 field_list[field_list.length] = field_match[1]
142 else if ((field_match = re.index_access.exec(replacement_field)) !== null) {
143 field_list[field_list.length] = field_match[1]
146 throw new SyntaxError("[sprintf] failed to parse named argument key")
151 throw new SyntaxError("[sprintf] failed to parse named argument key")
153 match[2] = field_list
158 if (arg_names === 3) {
159 throw new Error("[sprintf] mixing positional and named placeholders is not (yet) supported")
161 parse_tree[parse_tree.length] = match
164 throw new SyntaxError("[sprintf] unexpected placeholder")
166 _fmt = _fmt.substring(match[0].length)
171 var vsprintf = function(fmt, argv, _argv) {
172 _argv = (argv || []).slice(0)
173 _argv.splice(0, 0, fmt)
174 return sprintf.apply(null, _argv)
180 function get_type(variable) {
181 return Object.prototype.toString.call(variable).slice(8, -1).toLowerCase()
184 function str_repeat(input, multiplier) {
185 return Array(multiplier + 1).join(input)
189 * export to either browser or node.js
191 if (typeof exports !== "undefined") {
192 exports.sprintf = sprintf
193 exports.vsprintf = vsprintf
196 window.sprintf = sprintf
197 window.vsprintf = vsprintf
199 if (typeof define === "function" && define.amd) {
208 })(typeof window === "undefined" ? this : window);