element-auto-form/src/extend.js

Create automatic forms with element and json-shema (extended).

var clone = function (arg) {
  if (arg instanceof Array) {
    return merge([], arg)
  } else if (typeof arg === 'object' && arg.constructor === Object) {
    return merge({}, arg)
  } else {
    throw new Error('Can only clone, objects or arrays literals.')
  }
}

var mergeWithOptions = function () {
  var args = []
  for (var i = 1; i < arguments.length - 1; i++) {
    args[i - 1] = arguments[i]
  }

  var originalOptions = arguments[arguments.length - 1]
  var options = {
    mergeUndefined: originalOptions.mergeUndefined !== undefined ? originalOptions.mergeUndefined : true,
    mergeArrays: originalOptions.mergeArrays !== undefined ? originalOptions.mergeArrays : true
  }

  return _mergeTargets(arguments[0], args, options)
}

var merge = function () {
  var args = []
  for (var i = 1; i < arguments.length; i++) {
    args[i - 1] = arguments[i]
  }

  return _mergeTargets(arguments[0], args, {mergeUndefined: true, mergeArrays: true})
}

var _mergeTargets = function (first, sources, options) {
  for (var i = 0; i < sources.length; i++) {
    if (first instanceof Array && sources[i] instanceof Array) {
      _mergeArray(first, sources[i], options)
    } else if (typeof first === 'object' && first.constructor === Object && typeof sources[i] === 'object' && sources[i].constructor === Object) {
      _mergeObject(first, sources[i], options)
    } else {
      throw new Error('Root arguments must both be array literals or object literals.')
    }
  }

  return first
}

var _mergeArray = function (first, second, options) {
  for (var i = 0; i < second.length; i++) {
    var val = _mergeGetValue(first[i], second[i], options)
    if (val !== undefined || options.mergeUndefined === true) {
      first[i] = val
    }
  }
  return first
}

var _mergeObject = function (first, second, options) {
  for (var i in second) {
    var val = _mergeGetValue(first[i], second[i], options)
    if (val !== undefined || options.mergeUndefined === true) {
      first[i] = val
    }
  }
  return first
}

var _mergeGetValue = function (first, second, options) {
  if (typeof second !== 'object') {
    return second
  }

  if (second === null) {
    return second
  } else if (second instanceof Array) {
    return _mergeArray(options.mergeArrays === true && first !== undefined && first instanceof Array ? first : [], second, options)
  } else if (second.constructor === Object) {
    return _mergeObject(first !== undefined && first.constructor === Object ? first : {}, second, options)
  } else {
    throw new Error('fastextend only supports string, number, boolean, undefined, null and object/array literals, got \'' + second.constructor.name + '\'.')
  }
}

export {clone, merge, mergeWithOptions}