1 // from https://raw.github.com/kvz/phpjs/master/functions/strings/sprintf.js
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2 function sprintf () {
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3 // http://kevin.vanzonneveld.net
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4 // + original by: Ash Searle (http://hexmen.com/blog/)
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5 // + namespaced by: Michael White (http://getsprink.com)
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6 // + tweaked by: Jack
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7 // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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8 // + input by: Paulo Freitas
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9 // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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10 // + input by: Brett Zamir (http://brett-zamir.me)
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11 // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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12 // + improved by: Dj
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13 // * example 1: sprintf("%01.2f", 123.1);
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14 // * returns 1: 123.10
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15 // * example 2: sprintf("[%10s]", 'monkey');
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16 // * returns 2: '[ monkey]'
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17 // * example 3: sprintf("[%'#10s]", 'monkey');
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18 // * returns 3: '[####monkey]'
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19 var regex = /%%|%(\d+\$)?([-+\'#0 ]*)(\*\d+\$|\*|\d+)?(\.(\*\d+\$|\*|\d+))?([scboxXuideEfFgG])/g;
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25 var pad = function (str, len, chr, leftJustify) {
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29 var padding = (str.length >= len) ? '' : Array(1 + len - str.length >>> 0).join(chr);
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30 return leftJustify ? str + padding : padding + str;
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34 var justify = function (value, prefix, leftJustify, minWidth, zeroPad, customPadChar) {
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35 var diff = minWidth - value.length;
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37 if (leftJustify || !zeroPad) {
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38 value = pad(value, minWidth, customPadChar, leftJustify);
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40 value = value.slice(0, prefix.length) + pad('', diff, '0', true) + value.slice(prefix.length);
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47 var formatBaseX = function (value, base, prefix, leftJustify, minWidth, precision, zeroPad) {
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48 // Note: casts negative numbers to positive ones
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49 var number = value >>> 0;
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50 prefix = prefix && number && {
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55 value = prefix + pad(number.toString(base), precision || 0, '0', false);
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56 return justify(value, prefix, leftJustify, minWidth, zeroPad);
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60 var formatString = function (value, leftJustify, minWidth, precision, zeroPad, customPadChar) {
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61 if (precision != null) {
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62 value = value.slice(0, precision);
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64 return justify(value, '', leftJustify, minWidth, zeroPad, customPadChar);
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68 var doFormat = function (substring, valueIndex, flags, minWidth, _, precision, type) {
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75 if (substring == '%%') {
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80 var leftJustify = false,
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81 positivePrefix = '',
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83 prefixBaseX = false,
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84 customPadChar = ' ';
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85 var flagsl = flags.length;
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86 for (var j = 0; flags && j < flagsl; j++) {
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87 switch (flags.charAt(j)) {
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89 positivePrefix = ' ';
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92 positivePrefix = '+';
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98 customPadChar = flags.charAt(j + 1);
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104 prefixBaseX = true;
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109 // parameters may be null, undefined, empty-string or real valued
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110 // we want to ignore null, undefined and empty-string values
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113 } else if (minWidth == '*') {
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114 minWidth = +a[i++];
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115 } else if (minWidth.charAt(0) == '*') {
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116 minWidth = +a[minWidth.slice(1, -1)];
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118 minWidth = +minWidth;
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121 // Note: undocumented perl feature:
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122 if (minWidth < 0) {
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123 minWidth = -minWidth;
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124 leftJustify = true;
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127 if (!isFinite(minWidth)) {
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128 throw new Error('sprintf: (minimum-)width must be finite');
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132 precision = 'fFeE'.indexOf(type) > -1 ? 6 : (type == 'd') ? 0 : undefined;
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133 } else if (precision == '*') {
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134 precision = +a[i++];
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135 } else if (precision.charAt(0) == '*') {
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136 precision = +a[precision.slice(1, -1)];
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138 precision = +precision;
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141 // grab value using valueIndex if required?
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142 value = valueIndex ? a[valueIndex.slice(0, -1)] : a[i++];
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146 return formatString(String(value), leftJustify, minWidth, precision, zeroPad, customPadChar);
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148 return formatString(String.fromCharCode(+value), leftJustify, minWidth, precision, zeroPad);
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150 return formatBaseX(value, 2, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
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152 return formatBaseX(value, 8, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
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154 return formatBaseX(value, 16, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
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156 return formatBaseX(value, 16, prefixBaseX, leftJustify, minWidth, precision, zeroPad).toUpperCase();
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158 return formatBaseX(value, 10, prefixBaseX, leftJustify, minWidth, precision, zeroPad);
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161 number = (+value) | 0;
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162 prefix = number < 0 ? '-' : positivePrefix;
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163 value = prefix + pad(String(Math.abs(number)), precision, '0', false);
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164 return justify(value, prefix, leftJustify, minWidth, zeroPad);
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167 case 'f': // Should handle locales (as per setlocale)
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172 prefix = number < 0 ? '-' : positivePrefix;
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173 method = ['toExponential', 'toFixed', 'toPrecision']['efg'.indexOf(type.toLowerCase())];
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174 textTransform = ['toString', 'toUpperCase']['eEfFgG'.indexOf(type) % 2];
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175 value = prefix + Math.abs(number)[method](precision);
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176 return justify(value, prefix, leftJustify, minWidth, zeroPad)[textTransform]();
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182 return format.replace(regex, doFormat);
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