206 lines
8.4 KiB
JavaScript
206 lines
8.4 KiB
JavaScript
'use strict'
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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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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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export const vsprintf = (fmt, argv) => {
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return sprintf.apply(null, [fmt].concat(argv || []))
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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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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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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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if (re.number.test(ph.type)) {
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is_positive = arg >= 0
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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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var sprintf_cache = Object.create(null)
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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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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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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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