149 lines
3.3 KiB
JavaScript
149 lines
3.3 KiB
JavaScript
/**
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* filesize
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*
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* @author Jason Mulligan <jason.mulligan@avoidwork.com>
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* @copyright 2015 Jason Mulligan <jason.mulligan@avoidwork.com>
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* @license BSD-3-Clause
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* @link http://filesizejs.com
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* @module filesize
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* @version 3.1.3
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*/
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( global ) => {
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const bit = /b$/;
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const si = {
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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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* 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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let filesize = ( arg, descriptor={} ) => {
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let result = [];
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let skip = false;
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let val = 0;
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let e, base, bits, ceil, neg, num, output, round, unix, spacer, suffixes;
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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 !== undefined ? descriptor.base : 2;
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round = descriptor.round !== undefined ? descriptor.round : unix ? 1 : 2;
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spacer = descriptor.spacer !== undefined ? descriptor.spacer : unix ? "" : " ";
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suffixes = descriptor.suffixes !== undefined ? descriptor.suffixes : {};
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output = descriptor.output !== undefined ? descriptor.output : "string";
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e = descriptor.exponent !== undefined ? 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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// 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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if ( unix ) {
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result[ 1 ] = "";
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}
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else {
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result[ 1 ] = "B";
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}
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}
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else {
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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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}
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// Exceeding supported length, time to reduce & multiply
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if ( e > 8 ) {
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val = val * ( 1000 * ( e - 8 ) );
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e = 8;
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}
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if ( base === 2 ) {
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val = num / Math.pow( 2, ( e * 10 ) );
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}
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else {
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val = num / Math.pow( 1000, e );
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}
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if ( bits ) {
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val = ( val * 8 );
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if ( val > ceil ) {
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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 ] = si[ bits ? "bits" : "bytes" ][ e ];
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if ( !skip && unix ) {
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if ( bits && bit.test( result[ 1 ] ) ) {
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result[ 1 ] = result[ 1 ].toLowerCase();
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}
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result[ 1 ] = result[ 1 ].charAt( 0 );
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if ( result[ 1 ] === "B" ) {
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result[ 0 ] = Math.floor( result[ 0 ] );
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result[ 1 ] = "";
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}
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else if ( !bits && result[ 1 ] === "k" ) {
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result[ 1 ] = "K";
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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 suffix
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result[ 1 ] = suffixes[ 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 ] };
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}
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return result.join( spacer );
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}
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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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}
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else if ( typeof define === "function" ) {
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define( () => {
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return filesize;
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} );
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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 global !== "undefined" ? global : window );
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