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= function sprintf () {\n // discuss at: http://locutus.io/php/sprintf/\n // original by: Ash Searle (http://hexmen.com/blog/)\n // improved by: Michael White (http://getsprink.com)\n // improved by: Jack\n // improved by: Kevin van Zonneveld (http://kvz.io)\n // improved by: Kevin van Zonneveld (http://kvz.io)\n // improved by: Kevin van Zonneveld (http://kvz.io)\n // improved by: Dj\n // improved by: Allidylls\n // input by: Paulo Freitas\n // input by: Brett Zamir (http://brett-zamir.me)\n // improved by: Rafał Kukawski (http://kukawski.pl)\n // example 1: sprintf(\"%01.2f\", 123.1)\n // returns 1: '123.10'\n // example 2: sprintf(\"[%10s]\", 'monkey')\n // returns 2: '[ monkey]'\n // example 3: sprintf(\"[%'#10s]\", 'monkey')\n // returns 3: '[####monkey]'\n // example 4: sprintf(\"%d\", 123456789012345)\n // returns 4: '123456789012345'\n // example 5: sprintf('%-03s', 'E')\n // returns 5: 'E00'\n // example 6: sprintf('%+010d', 9)\n // returns 6: '+000000009'\n // example 7: sprintf('%+0\\'@10d', 9)\n // returns 7: '@@@@@@@@+9'\n // example 8: sprintf('%.f', 3.14)\n // returns 8: '3.140000'\n // example 9: sprintf('%% %2$d', 1, 2)\n // returns 9: '% 2'\n\n var regex = /%%|%(?:(\\d+)\\$)?((?:[-+#0 ]|'[\\s\\S])*)(\\d+)?(?:\\.(\\d*))?([\\s\\S])/g\n var args = arguments\n var i = 0\n var format = args[i++]\n\n var _pad = function (str, len, chr, leftJustify) {\n if (!chr) {\n chr = ' '\n }\n var padding = (str.length >= len) ? '' : new Array(1 + len - str.length >>> 0).join(chr)\n return leftJustify ? str + padding : padding + str\n }\n\n var justify = function (value, prefix, leftJustify, minWidth, padChar) {\n var diff = minWidth - value.length\n if (diff > 0) {\n // when padding with zeros\n // on the left side\n // keep sign (+ or -) in front\n if (!leftJustify && padChar === '0') {\n value = [\n value.slice(0, prefix.length),\n _pad('', diff, '0', true),\n value.slice(prefix.length)\n ].join('')\n } else {\n value = _pad(value, minWidth, padChar, leftJustify)\n }\n }\n return value\n }\n\n var _formatBaseX = function (value, base, leftJustify, minWidth, precision, padChar) {\n // Note: casts negative numbers to positive ones\n var number = value >>> 0\n value = _pad(number.toString(base), precision || 0, '0', false)\n return justify(value, '', leftJustify, minWidth, padChar)\n }\n\n // _formatString()\n var _formatString = function (value, leftJustify, minWidth, precision, customPadChar) {\n if (precision !== null && precision !== undefined) {\n value = value.slice(0, precision)\n }\n return justify(value, '', leftJustify, minWidth, customPadChar)\n }\n\n // doFormat()\n var doFormat = function (substring, argIndex, modifiers, minWidth, precision, specifier) {\n var number, prefix, method, textTransform, value\n\n if (substring === '%%') {\n return '%'\n }\n\n // parse modifiers\n var padChar = ' ' // pad with spaces by default\n var leftJustify = false\n var positiveNumberPrefix = ''\n var j, l\n\n for (j = 0, l = modifiers.length; j < l; j++) {\n switch (modifiers.charAt(j)) {\n case ' ':\n case '0':\n padChar = modifiers.charAt(j)\n break\n case '+':\n positiveNumberPrefix = '+'\n break\n case '-':\n leftJustify = true\n break\n case \"'\":\n if (j + 1 < l) {\n padChar = modifiers.charAt(j + 1)\n j++\n }\n break\n }\n }\n\n if (!minWidth) {\n minWidth = 0\n } else {\n minWidth = +minWidth\n }\n\n if (!isFinite(minWidth)) {\n throw new Error('Width must be finite')\n }\n\n if (!precision) {\n precision = (specifier === 'd') ? 0 : 'fFeE'.indexOf(specifier) > -1 ? 6 : undefined\n } else {\n precision = +precision\n }\n\n if (argIndex && +argIndex === 0) {\n throw new Error('Argument number must be greater than zero')\n }\n\n if (argIndex && +argIndex >= args.length) {\n throw new Error('Too few arguments')\n }\n\n value = argIndex ? args[+argIndex] : args[i++]\n\n switch (specifier) {\n case '%':\n return '%'\n case 's':\n return _formatString(value + '', leftJustify, minWidth, precision, padChar)\n case 'c':\n return _formatString(String.fromCharCode(+value), leftJustify, minWidth, precision, padChar)\n case 'b':\n return _formatBaseX(value, 2, leftJustify, minWidth, precision, padChar)\n case 'o':\n return _formatBaseX(value, 8, leftJustify, minWidth, precision, padChar)\n case 'x':\n return _formatBaseX(value, 16, leftJustify, minWidth, precision, padChar)\n case 'X':\n return _formatBaseX(value, 16, leftJustify, minWidth, precision, padChar)\n .toUpperCase()\n case 'u':\n return _formatBaseX(value, 10, leftJustify, minWidth, precision, padChar)\n case 'i':\n case 'd':\n number = +value || 0\n // Plain Math.round doesn't just truncate\n number = Math.round(number - number % 1)\n prefix = number < 0 ? '-' : positiveNumberPrefix\n value = prefix + _pad(String(Math.abs(number)), precision, '0', false)\n\n if (leftJustify && padChar === '0') {\n // can't right-pad 0s on integers\n padChar = ' '\n }\n return justify(value, prefix, leftJustify, minWidth, padChar)\n case 'e':\n case 'E':\n case 'f': // @todo: Should handle locales (as per setlocale)\n case 'F':\n case 'g':\n case 'G':\n number = +value\n prefix = number < 0 ? '-' : positiveNumberPrefix\n method = ['toExponential', 'toFixed', 'toPrecision']['efg'.indexOf(specifier.toLowerCase())]\n textTransform = ['toString', 'toUpperCase']['eEfFgG'.indexOf(specifier) % 2]\n value = prefix + Math.abs(number)[method](precision)\n return justify(value, prefix, leftJustify, minWidth, padChar)[textTransform]()\n default:\n // unknown specifier, consume that char and return empty\n return ''\n }\n }\n\n try {\n return format.replace(regex, doFormat)\n } catch (err) {\n return false\n }\n}\n"]}
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