1 | 'use strict';
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2 |
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3 | const b = /^(b|B)$/,
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4 | symbol = {
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5 | iec: {
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6 | bits: ["b", "Kib", "Mib", "Gib", "Tib", "Pib", "Eib", "Zib", "Yib"],
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7 | bytes: ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"]
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8 | },
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9 | jedec: {
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10 | bits: ["b", "Kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb"],
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11 | bytes: ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
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12 | }
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13 | },
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14 | fullform = {
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15 | iec: ["", "kibi", "mebi", "gibi", "tebi", "pebi", "exbi", "zebi", "yobi"],
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16 | jedec: ["", "kilo", "mega", "giga", "tera", "peta", "exa", "zetta", "yotta"]
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17 | };
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18 |
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19 | function filesize (arg, descriptor = {}) {
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20 | if (isNaN(arg)) {
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21 | throw new TypeError("Invalid number");
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22 | }
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23 |
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24 | let result = [],
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25 | val = 0,
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26 | bits = descriptor.bits === true,
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27 | unix = descriptor.unix === true,
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28 | base = descriptor.base || 2,
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29 | round = descriptor.round !== void 0 ? descriptor.round : unix ? 1 : 2,
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30 | locale = descriptor.locale !== void 0 ? descriptor.locale : "",
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31 | localeOptions = descriptor.localeOptions || {},
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32 | separator = descriptor.separator !== void 0 ? descriptor.separator : "",
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33 | spacer = descriptor.spacer !== void 0 ? descriptor.spacer : unix ? "" : " ",
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34 | symbols = descriptor.symbols || {},
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35 | standard = base === 2 ? descriptor.standard || "jedec" : "jedec",
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36 | output = descriptor.output || "string",
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37 | full = descriptor.fullform === true,
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38 | fullforms = descriptor.fullforms instanceof Array ? descriptor.fullforms : [],
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39 | e = descriptor.exponent !== void 0 ? descriptor.exponent : -1,
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40 | num = Number(arg),
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41 | neg = num < 0,
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42 | ceil = base > 2 ? 1000 : 1024;
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43 |
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44 |
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45 | if (neg) {
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46 | num = -num;
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47 | }
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48 |
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49 |
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50 | if (e === -1 || isNaN(e)) {
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51 | e = Math.floor(Math.log(num) / Math.log(ceil));
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52 |
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53 | if (e < 0) {
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54 | e = 0;
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55 | }
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56 | }
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57 |
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58 |
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59 | if (e > 8) {
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60 | e = 8;
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61 | }
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62 |
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63 | if (output === "exponent") {
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64 | return e;
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65 | }
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66 |
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67 |
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68 | if (num === 0) {
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69 | result[0] = 0;
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70 | result[1] = unix ? "" : symbol[standard][bits ? "bits" : "bytes"][e];
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71 | } else {
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72 | val = num / (base === 2 ? Math.pow(2, e * 10) : Math.pow(1000, e));
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73 |
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74 | if (bits) {
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75 | val = val * 8;
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76 |
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77 | if (val >= ceil && e < 8) {
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78 | val = val / ceil;
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79 | e++;
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80 | }
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81 | }
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82 |
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83 | result[0] = Number(val.toFixed(e > 0 ? round : 0));
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84 |
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85 | if (result[0] === ceil && e < 8 && descriptor.exponent === void 0) {
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86 | result[0] = 1;
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87 | e++;
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88 | }
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89 |
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90 | result[1] = base === 10 && e === 1 ? bits ? "kb" : "kB" : symbol[standard][bits ? "bits" : "bytes"][e];
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91 |
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92 | if (unix) {
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93 | result[1] = standard === "jedec" ? result[1].charAt(0) : e > 0 ? result[1].replace(/B$/, "") : result[1];
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94 |
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95 | if (b.test(result[1])) {
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96 | result[0] = Math.floor(result[0]);
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97 | result[1] = "";
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98 | }
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99 | }
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100 | }
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101 |
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102 |
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103 | if (neg) {
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104 | result[0] = -result[0];
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105 | }
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106 |
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107 |
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108 | result[1] = symbols[result[1]] || result[1];
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109 |
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110 | if (locale === true) {
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111 | result[0] = result[0].toLocaleString();
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112 | } else if (locale.length > 0) {
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113 | result[0] = result[0].toLocaleString(locale, localeOptions);
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114 | } else if (separator.length > 0) {
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115 | result[0] = result[0].toString().replace(".", separator);
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116 | }
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117 |
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118 |
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119 | if (output === "array") {
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120 | return result;
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121 | }
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122 |
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123 | if (full) {
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124 | result[1] = fullforms[e] ? fullforms[e] : fullform[standard][e] + (bits ? "bit" : "byte") + (result[0] === 1 ? "" : "s");
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125 | }
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126 |
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127 | if (output === "object") {
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128 | return {value: result[0], symbol: result[1]};
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129 | }
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130 |
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131 | return result.join(spacer);
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132 | }
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133 |
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134 |
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135 | filesize.partial = opt => arg => filesize(arg, opt);
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136 |
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137 | module.exports = filesize;
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