util.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Intelligent display kb m
 */
const bytesToSize = (bytes) => {
  if (bytes === 0) return '0 B'
  let k = 1024, // or 1024
    sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
    i = Math.floor(Math.log(bytes) / Math.log(k))

  return parseInt((bytes / Math.pow(k, i)).toPrecision(3)) + ' ' + sizes[i]
}

/**
 * Verify if it is in json format
 */
const isJson = (str) => {
  if (typeof str === 'string') {
    try {
      let obj = JSON.parse(str)
      if (typeof obj === 'object' && obj) {
        return true
      } else {
        return false
      }
    } catch (e) {
      return false
    }
  }
}
/**
 * Return json format
 */
const syntaxHighlight = (json) => {
  if (typeof json !== 'string') {
    json = JSON.stringify(json, undefined, 2)
  }
  json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>')
  return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) { // eslint-disable-line
    let cls = 'number'
    if (/^"/.test(match)) {
      if (/:$/.test(match)) {
        cls = 'key'
      } else {
        cls = 'string'
      }
    } else if (/true|false/.test(match)) {
      cls = 'boolean'
    } else if (/null/.test(match)) {
      cls = 'null'
    }
    return '<span class="' + cls + '">' + match + '</span>'
  })
}


export {
  bytesToSize,
  isJson,
  syntaxHighlight
}