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node_modules/bytes/index.js

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+/*!
+ * bytes
+ * Copyright(c) 2012-2014 TJ Holowaychuk
+ * Copyright(c) 2015 Jed Watson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = bytes;
+module.exports.format = format;
+module.exports.parse = parse;
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var formatThousandsRegExp = /\B(?=(\d{3})+(?!\d))/g;
+
+var formatDecimalsRegExp = /(?:\.0*|(\.[^0]+)0+)$/;
+
+var map = {
+  b:  1,
+  kb: 1 << 10,
+  mb: 1 << 20,
+  gb: 1 << 30,
+  tb: Math.pow(1024, 4),
+  pb: Math.pow(1024, 5),
+};
+
+var parseRegExp = /^((-|\+)?(\d+(?:\.\d+)?)) *(kb|mb|gb|tb|pb)$/i;
+
+/**
+ * Convert the given value in bytes into a string or parse to string to an integer in bytes.
+ *
+ * @param {string|number} value
+ * @param {{
+ *  case: [string],
+ *  decimalPlaces: [number]
+ *  fixedDecimals: [boolean]
+ *  thousandsSeparator: [string]
+ *  unitSeparator: [string]
+ *  }} [options] bytes options.
+ *
+ * @returns {string|number|null}
+ */
+
+function bytes(value, options) {
+  if (typeof value === 'string') {
+    return parse(value);
+  }
+
+  if (typeof value === 'number') {
+    return format(value, options);
+  }
+
+  return null;
+}
+
+/**
+ * Format the given value in bytes into a string.
+ *
+ * If the value is negative, it is kept as such. If it is a float,
+ * it is rounded.
+ *
+ * @param {number} value
+ * @param {object} [options]
+ * @param {number} [options.decimalPlaces=2]
+ * @param {number} [options.fixedDecimals=false]
+ * @param {string} [options.thousandsSeparator=]
+ * @param {string} [options.unit=]
+ * @param {string} [options.unitSeparator=]
+ *
+ * @returns {string|null}
+ * @public
+ */
+
+function format(value, options) {
+  if (!Number.isFinite(value)) {
+    return null;
+  }
+
+  var mag = Math.abs(value);
+  var thousandsSeparator = (options && options.thousandsSeparator) || '';
+  var unitSeparator = (options && options.unitSeparator) || '';
+  var decimalPlaces = (options && options.decimalPlaces !== undefined) ? options.decimalPlaces : 2;
+  var fixedDecimals = Boolean(options && options.fixedDecimals);
+  var unit = (options && options.unit) || '';
+
+  if (!unit || !map[unit.toLowerCase()]) {
+    if (mag >= map.pb) {
+      unit = 'PB';
+    } else if (mag >= map.tb) {
+      unit = 'TB';
+    } else if (mag >= map.gb) {
+      unit = 'GB';
+    } else if (mag >= map.mb) {
+      unit = 'MB';
+    } else if (mag >= map.kb) {
+      unit = 'KB';
+    } else {
+      unit = 'B';
+    }
+  }
+
+  var val = value / map[unit.toLowerCase()];
+  var str = val.toFixed(decimalPlaces);
+
+  if (!fixedDecimals) {
+    str = str.replace(formatDecimalsRegExp, '$1');
+  }
+
+  if (thousandsSeparator) {
+    str = str.split('.').map(function (s, i) {
+      return i === 0
+        ? s.replace(formatThousandsRegExp, thousandsSeparator)
+        : s
+    }).join('.');
+  }
+
+  return str + unitSeparator + unit;
+}
+
+/**
+ * Parse the string value into an integer in bytes.
+ *
+ * If no unit is given, it is assumed the value is in bytes.
+ *
+ * @param {number|string} val
+ *
+ * @returns {number|null}
+ * @public
+ */
+
+function parse(val) {
+  if (typeof val === 'number' && !isNaN(val)) {
+    return val;
+  }
+
+  if (typeof val !== 'string') {
+    return null;
+  }
+
+  // Test if the string passed is valid
+  var results = parseRegExp.exec(val);
+  var floatValue;
+  var unit = 'b';
+
+  if (!results) {
+    // Nothing could be extracted from the given string
+    floatValue = parseInt(val, 10);
+    unit = 'b'
+  } else {
+    // Retrieve the value and the unit
+    floatValue = parseFloat(results[1]);
+    unit = results[4].toLowerCase();
+  }
+
+  return Math.floor(map[unit] * floatValue);
+}