vuikit/core/util/stringify.js

A Vuejs component library based on UIkit

/**
* Vuikit 0.7.0
* (c) 2018 Miljan Aleksic
* @license MIT
*/

import { merge, isObject, isFunction } from 'vuikit/core/util'

/*
 * Safely and quickly serialize JavaScript objects
 * https://github.com/davidmarkclements/fast-safe-stringify
 */
export default function (obj) {
  if (isObject(obj) && !isFunction(obj.toJSON)) {
    decirc(merge({}, obj), '', [], null)
  }

  return JSON.stringify(obj)
}

function Circle (val, k, parent) {
  this.val = val
  this.k = k
  this.parent = parent
  this.count = 1
}

Circle.prototype.toJSON = function toJSON () {
  if (--this.count === 0) {
    this.parent[this.k] = this.val
  }
  return '[Circular]'
}

function decirc (val, k, stack, parent) {
  var keys, len, i
  if (typeof val !== 'object' || val === null) {
    // not an object, nothing to do
    return
  } else if (val instanceof Circle) {
    val.count++
    return
  } else if (typeof val.toJSON === 'function' && !val.toJSON.forceDecirc) {
    return
  } else if (parent) {
    if (~stack.indexOf(val)) {
      parent[k] = new Circle(val, k, parent)
      return
    }
  }
  stack.push(val)
  keys = Object.keys(val)
  len = keys.length
  i = 0
  for (; i < len; i++) {
    k = keys[i]
    decirc(val[k], k, stack, val)
  }
  stack.pop()
}