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|
/* global window, exports, define */
!function() {
'use strict'
var re = {
not_string: /[^s]/,
not_bool: /[^t]/,
not_type: /[^T]/,
not_primitive: /[^v]/,
number: /[diefg]/,
numeric_arg: /[bcdiefguxX]/,
json: /[j]/,
not_json: /[^j]/,
text: /^[^\x25]+/,
modulo: /^\x25{2}/,
placeholder: /^\x25(?:([1-9]\d*)\$|\(([^)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-gijostTuvxX])/,
key: /^([a-z_][a-z_\d]*)/i,
key_access: /^\.([a-z_][a-z_\d]*)/i,
index_access: /^\[(\d+)\]/,
sign: /^[+-]/
}
function sprintf(key) {
// `arguments` is not an array, but should be fine for this call
return sprintf_format(sprintf_parse(key), arguments)
}
function vsprintf(fmt, argv) {
return sprintf.apply(null, [fmt].concat(argv || []))
}
function sprintf_format(parse_tree, argv) {
var cursor = 1, tree_length = parse_tree.length, arg, output = '', i, k, ph, pad, pad_character, pad_length, is_positive, sign
for (i = 0; i < tree_length; i++) {
if (typeof parse_tree[i] === 'string') {
output += parse_tree[i]
}
else if (typeof parse_tree[i] === 'object') {
ph = parse_tree[i] // convenience purposes only
if (ph.keys) { // keyword argument
arg = argv[cursor]
for (k = 0; k < ph.keys.length; k++) {
if (arg == undefined) {
throw new Error(sprintf('[sprintf] Cannot access property "%s" of undefined value "%s"', ph.keys[k], ph.keys[k-1]))
}
arg = arg[ph.keys[k]]
}
}
else if (ph.param_no) { // positional argument (explicit)
arg = argv[ph.param_no]
}
else { // positional argument (implicit)
arg = argv[cursor++]
}
if (re.not_type.test(ph.type) && re.not_primitive.test(ph.type) && arg instanceof Function) {
arg = arg()
}
if (re.numeric_arg.test(ph.type) && (typeof arg !== 'number' && isNaN(arg))) {
throw new TypeError(sprintf('[sprintf] expecting number but found %T', arg))
}
if (re.number.test(ph.type)) {
is_positive = arg >= 0
}
switch (ph.type) {
case 'b':
arg = parseInt(arg, 10).toString(2)
break
case 'c':
arg = String.fromCharCode(parseInt(arg, 10))
break
case 'd':
case 'i':
arg = parseInt(arg, 10)
break
case 'j':
arg = JSON.stringify(arg, null, ph.width ? parseInt(ph.width) : 0)
break
case 'e':
arg = ph.precision ? parseFloat(arg).toExponential(ph.precision) : parseFloat(arg).toExponential()
break
case 'f':
arg = ph.precision ? parseFloat(arg).toFixed(ph.precision) : parseFloat(arg)
break
case 'g':
arg = ph.precision ? String(Number(arg.toPrecision(ph.precision))) : parseFloat(arg)
break
case 'o':
arg = (parseInt(arg, 10) >>> 0).toString(8)
break
case 's':
arg = String(arg)
arg = (ph.precision ? arg.substring(0, ph.precision) : arg)
break
case 't':
arg = String(!!arg)
arg = (ph.precision ? arg.substring(0, ph.precision) : arg)
break
case 'T':
arg = Object.prototype.toString.call(arg).slice(8, -1).toLowerCase()
arg = (ph.precision ? arg.substring(0, ph.precision) : arg)
break
case 'u':
arg = parseInt(arg, 10) >>> 0
break
case 'v':
arg = arg.valueOf()
arg = (ph.precision ? arg.substring(0, ph.precision) : arg)
break
case 'x':
arg = (parseInt(arg, 10) >>> 0).toString(16)
break
case 'X':
arg = (parseInt(arg, 10) >>> 0).toString(16).toUpperCase()
break
}
if (re.json.test(ph.type)) {
output += arg
}
else {
if (re.number.test(ph.type) && (!is_positive || ph.sign)) {
sign = is_positive ? '+' : '-'
arg = arg.toString().replace(re.sign, '')
}
else {
sign = ''
}
pad_character = ph.pad_char ? ph.pad_char === '0' ? '0' : ph.pad_char.charAt(1) : ' '
pad_length = ph.width - (sign + arg).length
pad = ph.width ? (pad_length > 0 ? pad_character.repeat(pad_length) : '') : ''
output += ph.align ? sign + arg + pad : (pad_character === '0' ? sign + pad + arg : pad + sign + arg)
}
}
}
return output
}
var sprintf_cache = Object.create(null)
function sprintf_parse(fmt) {
if (sprintf_cache[fmt]) {
return sprintf_cache[fmt]
}
var _fmt = fmt, match, parse_tree = [], arg_names = 0
while (_fmt) {
if ((match = re.text.exec(_fmt)) !== null) {
parse_tree.push(match[0])
}
else if ((match = re.modulo.exec(_fmt)) !== null) {
parse_tree.push('%')
}
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.push(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.push(field_match[1])
}
else if ((field_match = re.index_access.exec(replacement_field)) !== null) {
field_list.push(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.push(
{
placeholder: match[0],
param_no: match[1],
keys: match[2],
sign: match[3],
pad_char: match[4],
align: match[5],
width: match[6],
precision: match[7],
type: match[8]
}
)
}
else {
throw new SyntaxError('[sprintf] unexpected placeholder')
}
_fmt = _fmt.substring(match[0].length)
}
return sprintf_cache[fmt] = parse_tree
}
/**
* export to either browser or node.js
*/
/* eslint-disable quote-props */
if (typeof exports !== 'undefined') {
exports['sprintf'] = sprintf
exports['vsprintf'] = vsprintf
}
if (typeof window !== 'undefined') {
window['sprintf'] = sprintf
window['vsprintf'] = vsprintf
if (typeof define === 'function' && define['amd']) {
define(function() {
return {
'sprintf': sprintf,
'vsprintf': vsprintf
}
})
}
}
/* eslint-enable quote-props */
}(); // eslint-disable-line
|
