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(function(window) {
var re = {
not_string: /[^s]/,
number: /[diefg]/,
json: /[j]/,
not_json: /[^j]/,
text: /^[^\x25]+/,
modulo: /^\x25{2}/,
placeholder: /^\x25(?:([1-9]\d*)\$|\(([^\)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-gijosuxX])/,
key: /^([a-z_][a-z_\d]*)/i,
key_access: /^\.([a-z_][a-z_\d]*)/i,
index_access: /^\[(\d+)\]/,
sign: /^[\+\-]/
}
function sprintf() {
var key = arguments[0], cache = sprintf.cache
if (!(cache[key] && cache.hasOwnProperty(key))) {
cache[key] = sprintf.parse(key)
}
return sprintf.format.call(null, cache[key], arguments)
}
sprintf.format = function(parse_tree, argv) {
var cursor = 1, tree_length = parse_tree.length, node_type = "", arg, output = [], i, k, match, pad, pad_character, pad_length, is_positive = true, sign = ""
for (i = 0; i < tree_length; i++) {
node_type = get_type(parse_tree[i])
if (node_type === "string") {
output[output.length] = parse_tree[i]
}
else if (node_type === "array") {
match = parse_tree[i] // convenience purposes only
if (match[2]) { // keyword argument
arg = argv[cursor]
for (k = 0; k < match[2].length; k++) {
if (!arg.hasOwnProperty(match[2][k])) {
throw new Error(sprintf("[sprintf] property '%s' does not exist", match[2][k]))
}
arg = arg[match[2][k]]
}
}
else if (match[1]) { // positional argument (explicit)
arg = argv[match[1]]
}
else { // positional argument (implicit)
arg = argv[cursor++]
}
if (get_type(arg) == "function") {
arg = arg()
}
if (re.not_string.test(match[8]) && re.not_json.test(match[8]) && (get_type(arg) != "number" && isNaN(arg))) {
throw new TypeError(sprintf("[sprintf] expecting number but found %s", get_type(arg)))
}
if (re.number.test(match[8])) {
is_positive = arg >= 0
}
switch (match[8]) {
case "b":
arg = arg.toString(2)
break
case "c":
arg = String.fromCharCode(arg)
break
case "d":
case "i":
arg = parseInt(arg, 10)
break
case "j":
arg = JSON.stringify(arg, null, match[6] ? parseInt(match[6]) : 0)
break
case "e":
arg = match[7] ? arg.toExponential(match[7]) : arg.toExponential()
break
case "f":
arg = match[7] ? parseFloat(arg).toFixed(match[7]) : parseFloat(arg)
break
case "g":
arg = match[7] ? parseFloat(arg).toPrecision(match[7]) : parseFloat(arg)
break
case "o":
arg = arg.toString(8)
break
case "s":
arg = ((arg = String(arg)) && match[7] ? arg.substring(0, match[7]) : arg)
break
case "u":
arg = arg >>> 0
break
case "x":
arg = arg.toString(16)
break
case "X":
arg = arg.toString(16).toUpperCase()
break
}
if (re.json.test(match[8])) {
output[output.length] = arg
}
else {
if (re.number.test(match[8]) && (!is_positive || match[3])) {
sign = is_positive ? "+" : "-"
arg = arg.toString().replace(re.sign, "")
}
else {
sign = ""
}
pad_character = match[4] ? match[4] === "0" ? "0" : match[4].charAt(1) : " "
pad_length = match[6] - (sign + arg).length
pad = match[6] ? (pad_length > 0 ? str_repeat(pad_character, pad_length) : "") : ""
output[output.length] = match[5] ? sign + arg + pad : (pad_character === "0" ? sign + pad + arg : pad + sign + arg)
}
}
}
return output.join("")
}
sprintf.cache = {}
sprintf.parse = function(fmt) {
var _fmt = fmt, match = [], parse_tree = [], arg_names = 0
while (_fmt) {
if ((match = re.text.exec(_fmt)) !== null) {
parse_tree[parse_tree.length] = match[0]
}
else if ((match = re.modulo.exec(_fmt)) !== null) {
parse_tree[parse_tree.length] = "%"
}
else if ((match = re.placeholder.exec(_fmt)) !== null) {
if (match[2]) {
arg_names |= 1
var field_list = [], replacement_field = match[2], field_match = []
if ((field_match = re.key.exec(replacement_field)) !== null) {
field_list[field_list.length] = field_match[1]
while ((replacement_field = replacement_field.substring(field_match[0].length)) !== "") {
if ((field_match = re.key_access.exec(replacement_field)) !== null) {
field_list[field_list.length] = field_match[1]
}
else if ((field_match = re.index_access.exec(replacement_field)) !== null) {
field_list[field_list.length] = field_match[1]
}
else {
throw new SyntaxError("[sprintf] failed to parse named argument key")
}
}
}
else {
throw new SyntaxError("[sprintf] failed to parse named argument key")
}
match[2] = field_list
}
else {
arg_names |= 2
}
if (arg_names === 3) {
throw new Error("[sprintf] mixing positional and named placeholders is not (yet) supported")
}
parse_tree[parse_tree.length] = match
}
else {
throw new SyntaxError("[sprintf] unexpected placeholder")
}
_fmt = _fmt.substring(match[0].length)
}
return parse_tree
}
var vsprintf = function(fmt, argv, _argv) {
_argv = (argv || []).slice(0)
_argv.splice(0, 0, fmt)
return sprintf.apply(null, _argv)
}
/**
* helpers
*/
function get_type(variable) {
return Object.prototype.toString.call(variable).slice(8, -1).toLowerCase()
}
function str_repeat(input, multiplier) {
return Array(multiplier + 1).join(input)
}
/**
* export to either browser or node.js
*/
if (typeof exports !== "undefined") {
exports.sprintf = sprintf
exports.vsprintf = vsprintf
}
else {
window.sprintf = sprintf
window.vsprintf = vsprintf
if (typeof define === "function" && define.amd) {
define(function() {
return {
sprintf: sprintf,
vsprintf: vsprintf
}
})
}
}
})(typeof window === "undefined" ? this : window);
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