152 lines
4.0 KiB
JavaScript
152 lines
4.0 KiB
JavaScript
/**
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* filesize
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*
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* @copyright 2018 Jason Mulligan <jason.mulligan@avoidwork.com>
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* @license BSD-3-Clause
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* @version 3.6.1
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*/
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(function (global) {
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const b = /^(b|B)$/,
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symbol = {
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iec: {
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bits: ["b", "Kib", "Mib", "Gib", "Tib", "Pib", "Eib", "Zib", "Yib"],
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bytes: ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"]
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},
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jedec: {
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bits: ["b", "Kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb"],
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bytes: ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
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}
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},
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fullform = {
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iec: ["", "kibi", "mebi", "gibi", "tebi", "pebi", "exbi", "zebi", "yobi"],
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jedec: ["", "kilo", "mega", "giga", "tera", "peta", "exa", "zetta", "yotta"]
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};
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/**
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* filesize
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*
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* @method filesize
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* @param {Mixed} arg String, Int or Float to transform
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* @param {Object} descriptor [Optional] Flags
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* @return {String} Readable file size String
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*/
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function filesize (arg, descriptor = {}) {
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let result = [],
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val = 0,
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e, base, bits, ceil, full, fullforms, neg, num, output, round, unix, separator, spacer, standard, symbols;
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if (isNaN(arg)) {
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throw new Error("Invalid arguments");
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}
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bits = descriptor.bits === true;
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unix = descriptor.unix === true;
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base = descriptor.base || 2;
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round = descriptor.round !== void 0 ? descriptor.round : unix ? 1 : 2;
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separator = descriptor.separator !== void 0 ? descriptor.separator || "" : "";
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spacer = descriptor.spacer !== void 0 ? descriptor.spacer : unix ? "" : " ";
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symbols = descriptor.symbols || descriptor.suffixes || {};
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standard = base === 2 ? descriptor.standard || "jedec" : "jedec";
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output = descriptor.output || "string";
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full = descriptor.fullform === true;
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fullforms = descriptor.fullforms instanceof Array ? descriptor.fullforms : [];
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e = descriptor.exponent !== void 0 ? descriptor.exponent : -1;
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num = Number(arg);
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neg = num < 0;
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ceil = base > 2 ? 1000 : 1024;
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// Flipping a negative number to determine the size
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if (neg) {
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num = -num;
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}
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// Determining the exponent
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if (e === -1 || isNaN(e)) {
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e = Math.floor(Math.log(num) / Math.log(ceil));
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if (e < 0) {
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e = 0;
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}
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}
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// Exceeding supported length, time to reduce & multiply
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if (e > 8) {
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e = 8;
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}
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// Zero is now a special case because bytes divide by 1
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if (num === 0) {
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result[0] = 0;
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result[1] = unix ? "" : symbol[standard][bits ? "bits" : "bytes"][e];
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} else {
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val = num / (base === 2 ? Math.pow(2, e * 10) : Math.pow(1000, e));
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if (bits) {
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val = val * 8;
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if (val >= ceil && e < 8) {
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val = val / ceil;
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e++;
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}
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}
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result[0] = Number(val.toFixed(e > 0 ? round : 0));
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result[1] = base === 10 && e === 1 ? bits ? "kb" : "kB" : symbol[standard][bits ? "bits" : "bytes"][e];
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if (unix) {
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result[1] = standard === "jedec" ? result[1].charAt(0) : e > 0 ? result[1].replace(/B$/, "") : result[1];
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if (b.test(result[1])) {
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result[0] = Math.floor(result[0]);
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result[1] = "";
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}
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}
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}
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// Decorating a 'diff'
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if (neg) {
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result[0] = -result[0];
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}
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// Applying custom symbol
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result[1] = symbols[result[1]] || result[1];
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// Returning Array, Object, or String (default)
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if (output === "array") {
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return result;
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}
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if (output === "exponent") {
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return e;
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}
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if (output === "object") {
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return {value: result[0], suffix: result[1], symbol: result[1]};
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}
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if (full) {
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result[1] = fullforms[e] ? fullforms[e] : fullform[standard][e] + (bits ? "bit" : "byte") + (result[0] === 1 ? "" : "s");
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}
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if (separator.length > 0) {
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result[0] = result[0].toString().replace(".", separator);
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}
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return result.join(spacer);
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}
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// Partial application for functional programming
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filesize.partial = opt => arg => filesize(arg, opt);
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// CommonJS, AMD, script tag
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if (typeof exports !== "undefined") {
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module.exports = filesize;
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} else if (typeof define === "function" && define.amd) {
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define(() => {
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return filesize;
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});
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} else {
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global.filesize = filesize;
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}
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}(typeof window !== "undefined" ? window : global));
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