using?System;
using?System.Collections;
using?System.Collections.Generic;
using?System.Globalization;
using?System.Runtime.Serialization;
using?System.Text;

namespace?ZenFulcrum.embeddedBrowser
{

????/**
?????*?Stand-in?class?for?a?javascript?value?that?can?be?one?of?many?different?types.
?????*
?????*?Bad?lookups?are?safe.?That?is?if?you?try?to?look?up?something?that?doesn‘t?exist?you?will?not?get?an?exception
?????*?but?an?“invalid“?node.?Use?Check（）?if?you?want?an?exception?on?invalid?lookups:
?????*
?????*???var?node?=?JSONNode.Parse（@“{““a““:1}“）;
?????*???node[“a“].IsValid?==?true;
?????*???node[“bob“].IsValid?==?false
?????*???node[“bob“][“foo“].IsValid?==?false?//but?doesn‘t?throw?an?exception
?????*???node[“a“].Check（）?//okay
?????*???node[“bob“].Check（）?//throw?exception
?????*
?????*?Values?can?be?implicitly?converted?to?JSONNodes?and?back.?That?means?you?don‘t?have?to?use?properties?like
?????*?“IntValue“?and?“StringValue“.?Simply?try?to?use?the?node?as?that?type?and?it?will?convert?to?the?value
?????*?if?it‘s?that?type?or?return?a?default?value?if?it?isn‘t:
?????*
?????*???var?node?=?JSONNode.Parse（@“{““a““:1?““b““:?““apples““}“）;
?????*???int?a?=?node[“a“];
?????*???a?==?1;
?????*???string?b?=?node[“b“];
?????*???b?==?“apples“;
?????*???string?str?=?node[“a“];
?????*???str?==?null;?//null?is?the?default?value?for?a?string.
?????*
?????*?You?can?also?use?new?JSONNode（value）?for?many?different?types?though?often?it‘s?easier?to?just?assign?a
?????*?value?and?let?it?auto-convert.
?????*
?????*?Because?they?act?a?little?special?use?node.IsNull?and?node.IsValid?to?check?for?null?and?invalid?values.
?????*?Real?null?still?acts?like?null?though?so?use?JSONNode.NullNode?to?create?a?“null“?JSONNode.
?????*?You?can?also?use?JSONNode.InvalidNode?to?get?an?invalid?JSONNode?outright.
?????*
?????*?Note?that?while?reading?blind?is?safe?assignment?is?not.?Attempting?to?assign?object?keys?to?an?integer?for?example
?????*?will?throw?an?exception.?To?append?to?an?array?call?.Add（）?or?assign?to?-1.?To?remove?an?object?key?or?array?element
?????*?assign?JSONNode.InvalidNode?to?it.
?????*
?????*/
????public?class?JSONNode?:?IEnumerable
????{
????????/**?Parses?the?given?JSON?document?to?a?JSONNode.?Throws?a?SerializationException?on?parse?error.?*/
????????public?static?JSONNode?Parse（string?json）
????????{
????????????return?JSONParser.Parse（json）;
????????}

????????public?static?readonly?JSONNode?InvalidNode?=?new?JSONNode（NodeType.Invalid）;
????????public?static?readonly?JSONNode?NullNode?=?new?JSONNode（NodeType.Null）;

????????public?enum?NodeType
????????{
????????????/**?Getting?this?value?would?result?in?undefined?or?ordinarily?throw?some?type?of?exception?trying?to?fetch?it.?*/
????????????Invalid
????????????String
????????????Number
????????????object
????????????Array
????????????Bool
????????????Null
????????}

????????private?NodeType?_type?=?NodeTyp