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