text: /* eslint-disable */
  /*
      cycle.js
      2017-02-07
  
      Public Domain.
  
      NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
  
      This code should be minified before deployment.
      See http://javascript.crockford.com/jsmin.html
  
      USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
      NOT CONTROL.
  */
  
  // The file uses the WeakMap feature of ES6.
  
  /*jslint es6, eval */
  
  /*property
      $ref, decycle, forEach, get, indexOf, isArray, keys, length, push,
      retrocycle, set, stringify, test
  */
  
  export function decycle(object, replacer) {
    'use strict'
  
    // Make a deep copy of an object or array, assuring that there is at most
    // one instance of each object or array in the resulting structure. The
    // duplicate references (which might be forming cycles) are replaced with
    // an object of the form
  
    //      {"$ref": PATH}
  
    // where the PATH is a JSONPath string that locates the first occurance.
  
    // So,
  
    //      var a = [];
    //      a[0] = a;
    //      return JSON.stringify(JSON.decycle(a));
  
    // produces the string '[{"$ref":"$"}]'.
  
    // If a replacer function is provided, then it will be called for each value.
    // A replacer function receives a value and returns a replacement value.
  
    // JSONPath is used to locate the unique object. $ indicates the top level of
    // the object or array. [NUMBER] or [STRING] indicates a child element or
    // property.
  
    var objects = new WeakMap() // object to path mappings
  
    return (function derez(value, path) {
      // The derez function recurses through the object, producing the deep copy.
  
      var old_path // The path of an earlier occurance of value
      var nu // The new object or array
  
      // If a replacer function was provided, then call it to get a replacement value.
  
      if (replacer !== undefined) {
        value = replacer(value)
      }
  
      // typeof null === "object", so go on if this value is really an object but not
      // one of the weird builtin objects.
  
      if (
        typeof value === 'object' &&
        value !== null &&
        !(value instanceof Boolean) &&
        !(value instanceof Date) &&
        !(value instanceof Number) &&
        !(value instanceof RegExp) &&
        !(value instanceof String)
      ) {
        // If the value is an object or array, look to see if we have already
        // encountered it. If so, return a {"$ref":PATH} object. This uses an
        // ES6 WeakMap.
  
        old_path = objects.get(value)
        if (old_path !== undefined) {
          return { $ref: old_path }
        }
  
        // Otherwise, accumulate the unique value and its path.
  
        objects.set(value, path)
  
        // If it is an array, replicate the array.
  
        if (Array.isArray(value)) {
          nu = []
          value.forEach(function(element, i) {
            nu[i] = derez(element, path + '[' + i + ']')
          })
        } else {
          // If it is an object, replicate the object.
  
          nu = {}
          Object.keys(value).forEach(function(name) {
            nu[name] = derez(value[name], path + '[' + JSON.stringify(name) + ']')
          })
        }
        return nu
      }
      return value
    })(object, '$')
  }
  
  export function retrocycle($) {
    'use strict'
  
    // Restore an object that was reduced by decycle. Members whose values are
    // objects of the form
    //      {$ref: PATH}
    // are replaced with references to the value found by the PATH. This will
    // restore cycles. The object will be mutated.
  
    // The eval function is used to locate the values described by a PATH. The
    // root object is kept in a $ variable. A regular expression is used to
    // assure that the PATH is extremely well formed. The regexp contains nested
    // * quantifiers. That has been known to have extremely bad performance
    // problems on some browsers for very long strings. A PATH is expected to be
    // reasonably short. A PATH is allowed to belong to a very restricted subset of
    // Goessner's JSONPath.
  
    // So,
    //      var s = '[{"$ref":"$"}]';
    //      return JSON.retrocycle(JSON.parse(s));
    // produces an array containing a single element which is the array itself.
  
    var px = /^\$(?:\[(?:\d+|"(?:[^\\"\u0000-\u001f]|\\([\\"\/bfnrt]|u[0-9a-zA-Z]{4}))*")\])*$/
  
    ;(function rez(value) {
      // The rez function walks recursively through the object looking for $ref
      // properties. When it finds one that has a value that is a path, then it
      // replaces the $ref object with a reference to the value that is found by
      // the path.
  
      if (value && typeof value === 'object') {
        if (Array.isArray(value)) {
          value.forEach(function(element, i) {
            if (typeof element === 'object' && element !== null) {
              var path = element.$ref
              if (typeof path === 'string' && px.test(path)) {
                value[i] = eval(path)
              } else {
                rez(element)
              }
            }
          })
        } else {
          Object.keys(value).forEach(function(name) {
            var item = value[name]
            if (typeof item === 'object' && item !== null) {
              var path = item.$ref
              if (typeof path === 'string' && px.test(path)) {
                value[name] = eval(path)
              } else {
                rez(item)
              }
            }
          })
        }
      }
    })($)
    return $
  }
  