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