| 1 | (function(window) { |
| 2 | var re = { |
| 3 | not_string: /[^s]/, |
| 4 | number: /[dief]/, |
| 5 | text: /^[^\x25]+/, |
| 6 | modulo: /^\x25{2}/, |
| 7 | placeholder: /^\x25(?:([1-9]\d*)\$|\(([^\)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fiosuxX])/, |
| 8 | key: /^([a-z_][a-z_\d]*)/i, |
| 9 | key_access: /^\.([a-z_][a-z_\d]*)/i, |
| 10 | index_access: /^\[(\d+)\]/, |
| 11 | sign: /^[\+\-]/ |
| 12 | } |
| 13 | |
| 14 | function sprintf() { |
| 15 | var key = arguments[0], cache = sprintf.cache |
| 16 | if (!(cache[key] && cache.hasOwnProperty(key))) { |
| 17 | cache[key] = sprintf.parse(key) |
| 18 | } |
| 19 | return sprintf.format.call(null, cache[key], arguments) |
| 20 | } |
| 21 | |
| 22 | sprintf.format = function(parse_tree, argv) { |
| 23 | var cursor = 1, tree_length = parse_tree.length, node_type = "", arg, output = [], i, k, match, pad, pad_character, pad_length, is_positive = true, sign = "" |
| 24 | for (i = 0; i < tree_length; i++) { |
| 25 | node_type = get_type(parse_tree[i]) |
| 26 | if (node_type === "string") { |
| 27 | output[output.length] = parse_tree[i] |
| 28 | } |
| 29 | else if (node_type === "array") { |
| 30 | match = parse_tree[i] // convenience purposes only |
| 31 | if (match[2]) { // keyword argument |
| 32 | arg = argv[cursor] |
| 33 | for (k = 0; k < match[2].length; k++) { |
| 34 | if (!arg.hasOwnProperty(match[2][k])) { |
| 35 | throw new Error(sprintf("[sprintf] property '%s' does not exist", match[2][k])) |
| 36 | } |
| 37 | arg = arg[match[2][k]] |
| 38 | } |
| 39 | } |
| 40 | else if (match[1]) { // positional argument (explicit) |
| 41 | arg = argv[match[1]] |
| 42 | } |
| 43 | else { // positional argument (implicit) |
| 44 | arg = argv[cursor++] |
| 45 | } |
| 46 | |
| 47 | if (get_type(arg) == "function") { |
| 48 | arg = arg() |
| 49 | } |
| 50 | |
| 51 | if (re.not_string.test(match[8]) && (get_type(arg) != "number" && isNaN(arg))) { |
| 52 | throw new TypeError(sprintf("[sprintf] expecting number but found %s", get_type(arg))) |
| 53 | } |
| 54 | |
| 55 | if (re.number.test(match[8])) { |
| 56 | is_positive = arg >= 0 |
| 57 | } |
| 58 | |
| 59 | switch (match[8]) { |
| 60 | case "b": |
| 61 | arg = arg.toString(2) |
| 62 | break |
| 63 | case "c": |
| 64 | arg = String.fromCharCode(arg) |
| 65 | break |
| 66 | case "d": |
| 67 | case "i": |
| 68 | arg = parseInt(arg, 10) |
| 69 | break |
| 70 | case "e": |
| 71 | arg = match[7] ? arg.toExponential(match[7]) : arg.toExponential() |
| 72 | break |
| 73 | case "f": |
| 74 | arg = match[7] ? parseFloat(arg).toFixed(match[7]) : parseFloat(arg) |
| 75 | break |
| 76 | case "o": |
| 77 | arg = arg.toString(8) |
| 78 | break |
| 79 | case "s": |
| 80 | arg = ((arg = String(arg)) && match[7] ? arg.substring(0, match[7]) : arg) |
| 81 | break |
| 82 | case "u": |
| 83 | arg = arg >>> 0 |
| 84 | break |
| 85 | case "x": |
| 86 | arg = arg.toString(16) |
| 87 | break |
| 88 | case "X": |
| 89 | arg = arg.toString(16).toUpperCase() |
| 90 | break |
| 91 | } |
| 92 | if (re.number.test(match[8]) && (!is_positive || match[3])) { |
| 93 | sign = is_positive ? "+" : "-" |
| 94 | arg = arg.toString().replace(re.sign, "") |
| 95 | } |
| 96 | else { |
| 97 | sign = "" |
| 98 | } |
| 99 | pad_character = match[4] ? match[4] === "0" ? "0" : match[4].charAt(1) : " " |
| 100 | pad_length = match[6] - (sign + arg).length |
| 101 | pad = match[6] ? (pad_length > 0 ? str_repeat(pad_character, pad_length) : "") : "" |
| 102 | output[output.length] = match[5] ? sign + arg + pad : (pad_character === "0" ? sign + pad + arg : pad + sign + arg) |
| 103 | } |
| 104 | } |
| 105 | return output.join("") |
| 106 | } |
| 107 | |
| 108 | sprintf.cache = {} |
| 109 | |
| 110 | sprintf.parse = function(fmt) { |
| 111 | var _fmt = fmt, match = [], parse_tree = [], arg_names = 0 |
| 112 | while (_fmt) { |
| 113 | if ((match = re.text.exec(_fmt)) !== null) { |
| 114 | parse_tree[parse_tree.length] = match[0] |
| 115 | } |
| 116 | else if ((match = re.modulo.exec(_fmt)) !== null) { |
| 117 | parse_tree[parse_tree.length] = "%" |
| 118 | } |
| 119 | else if ((match = re.placeholder.exec(_fmt)) !== null) { |
| 120 | if (match[2]) { |
| 121 | arg_names |= 1 |
| 122 | var field_list = [], replacement_field = match[2], field_match = [] |
| 123 | if ((field_match = re.key.exec(replacement_field)) !== null) { |
| 124 | field_list[field_list.length] = field_match[1] |
| 125 | while ((replacement_field = replacement_field.substring(field_match[0].length)) !== "") { |
| 126 | if ((field_match = re.key_access.exec(replacement_field)) !== null) { |
| 127 | field_list[field_list.length] = field_match[1] |
| 128 | } |
| 129 | else if ((field_match = re.index_access.exec(replacement_field)) !== null) { |
| 130 | field_list[field_list.length] = field_match[1] |
| 131 | } |
| 132 | else { |
| 133 | throw new SyntaxError("[sprintf] failed to parse named argument key") |
| 134 | } |
| 135 | } |
| 136 | } |
| 137 | else { |
| 138 | throw new SyntaxError("[sprintf] failed to parse named argument key") |
| 139 | } |
| 140 | match[2] = field_list |
| 141 | } |
| 142 | else { |
| 143 | arg_names |= 2 |
| 144 | } |
| 145 | if (arg_names === 3) { |
| 146 | throw new Error("[sprintf] mixing positional and named placeholders is not (yet) supported") |
| 147 | } |
| 148 | parse_tree[parse_tree.length] = match |
| 149 | } |
| 150 | else { |
| 151 | throw new SyntaxError("[sprintf] unexpected placeholder") |
| 152 | } |
| 153 | _fmt = _fmt.substring(match[0].length) |
| 154 | } |
| 155 | return parse_tree |
| 156 | } |
| 157 | |
| 158 | var vsprintf = function(fmt, argv, _argv) { |
| 159 | _argv = (argv || []).slice(0) |
| 160 | _argv.splice(0, 0, fmt) |
| 161 | return sprintf.apply(null, _argv) |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * helpers |
| 166 | */ |
| 167 | function get_type(variable) { |
| 168 | return Object.prototype.toString.call(variable).slice(8, -1).toLowerCase() |
| 169 | } |
| 170 | |
| 171 | function str_repeat(input, multiplier) { |
| 172 | return Array(multiplier + 1).join(input) |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * export to either browser or node.js |
| 177 | */ |
| 178 | if (typeof exports !== "undefined") { |
| 179 | exports.sprintf = sprintf |
| 180 | exports.vsprintf = vsprintf |
| 181 | } |
| 182 | else { |
| 183 | window.sprintf = sprintf |
| 184 | window.vsprintf = vsprintf |
| 185 | |
| 186 | if (typeof define === "function" && define.amd) { |
| 187 | define(function() { |
| 188 | return { |
| 189 | sprintf: sprintf, |
| 190 | vsprintf: vsprintf |
| 191 | } |
| 192 | }) |
| 193 | } |
| 194 | } |
| 195 | })(typeof window === "undefined" ? this : window); |