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function sprintf(){var regex=/%%|%(\d+\$)?([-+#0 ]*)(\*\d+\$|\*|\d+)?(\.(\*\d+\$|\*|\d+))?([scboxXuidfegEG])/g;var a=arguments,i=0,format=a[i++];var pad=function(str,len,chr,leftJustify){var padding=(str.length>=len)?'':Array(1+len-str.length>>>0).join(chr);return leftJustify?str+padding:padding+str;};var justify=function(value,prefix,leftJustify,minWidth,zeroPad){var diff=minWidth-value.length;if(diff>0){if(leftJustify||!zeroPad){value=pad(value,minWidth,' ',leftJustify);}else{value=value.slice(0,prefix.length)+pad('',diff,'0',true)+value.slice(prefix.length);}}return value;};var formatBaseX=function(value,base,prefix,leftJustify,minWidth,precision,zeroPad){var number=value>>>0;prefix=prefix&&number&&{'2':'0b','8':'0','16':'0x'}[base]||'';value=prefix+pad(number.toString(base),precision||0,'0',false);return justify(value,prefix,leftJustify,minWidth,zeroPad);};var formatString = function(value,leftJustify,minWidth,precision,zeroPad){if(precision!=null){value=value.slice(0,precision);}return justify(value,'',leftJustify,minWidth,zeroPad);};var doFormat=function(substring,valueIndex,flags,minWidth,_,precision,type){if(substring=='%%') return '%';var leftJustify=false,positivePrefix='',zeroPad=false,prefixBaseX=false;for(var j=0;flags&&j<flags.length;j++) switch(flags.charAt(j)){case ' ':positivePrefix=' ';break;case '+':positivePrefix='+';break;case '-':leftJustify=true;break;case '0':zeroPad=true;break;case '#':prefixBaseX=true;break;}if(!minWidth){minWidth=0;}else if(minWidth=='*'){minWidth=+a[i++];}else if(minWidth.charAt(0)=='*'){minWidth=+a[minWidth.slice(1,-1)];}else{minWidth=+minWidth;}if(minWidth<0){minWidth=-minWidth;leftJustify=true;}if(!isFinite(minWidth)){throw new Error('sprintf: not width');}if(!precision){precision='fFeE'.indexOf(type)>-1?6:(type=='d')?0:void(0);}else if(precision=='*'){precision=+a[i++];}else if(precision.charAt(0)=='*'){precision=+a[precision.slice(1,-1)];}else{precision=+precision;}var value=valueIndex?a[valueIndex.slice(0,-1)]:a[i++];switch(type){case 's':return formatString(String(value),leftJustify,minWidth,precision,zeroPad);case 'c':return formatString(String.fromCharCode(+value),leftJustify,minWidth,precision,zeroPad);case 'b':return formatBaseX(value,2,prefixBaseX,leftJustify,minWidth,precision,zeroPad);case 'o':return formatBaseX(value,8,prefixBaseX,leftJustify,minWidth,precision,zeroPad);case 'x':return formatBaseX(value,16,prefixBaseX,leftJustify,minWidth,precision,zeroPad);case 'X':return formatBaseX(value,16,prefixBaseX,leftJustify,minWidth,precision,zeroPad).toUpperCase();case 'u':return formatBaseX(value,10,prefixBaseX,leftJustify,minWidth,precision,zeroPad);case 'i':case 'd':{var number=parseInt(+value);var prefix=number<0?'-':positivePrefix;value=prefix+pad(String(Math.abs(number)),precision,'0',false);return justify(value,prefix,leftJustify,minWidth,zeroPad);}case 'e':case 'E':case 'f':case 'F':case 'g':case 'G':{var number=+value;var prefix=number<0?'-':positivePrefix;var method=['toExponential','toFixed','toPrecision']['efg'.indexOf(type.toLowerCase())];var textTransform=['toString','toUpperCase']['eEfFgG'.indexOf(type)%2];value=prefix+Math.abs(number)[method](precision);return justify(value,prefix,leftJustify,minWidth,zeroPad)[textTransform]();}default:return substring;}};return format.replace(regex,doFormat);}
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