using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;



namespace TEAMModelOS.SDK.Helper.Common.JsonHelper
{
    public static class JsonPathExtensions
    {
        public static T As<T>(this JsonPathNode node) { return As(node, default(T)); }
        public static T As<T>(this JsonPathNode node, T prototype) { return (T)node.Value; }
        public static T[] As<T>(this JsonPathNode[] nodes) { return As(nodes, default(T)); }
        public static T[] As<T>(this JsonPathNode[] nodes, T prototype) { return nodes.Select(node => node.As<T>()).ToArray(); }
    }

    public delegate object JsonPathScriptEvaluator(string script, object value, IJsonPathContext context);

    public sealed class JsonPathSelection
    {
        public readonly JsonPathContext Context;
        public JsonPathSelection(object data) : this(data, null as IJsonPathValueSystem) { }
        public JsonPathSelection(object data, IJsonPathValueSystem valueSystem) : this(data, valueSystem, null) { }
        public JsonPathSelection(object data, JsonPathScriptEvaluator evaluator) : this(data, null, evaluator) { }
        public JsonPathSelection(object data, IJsonPathValueSystem valueSystem, JsonPathScriptEvaluator evaluator) { Context = new JsonPathContext(data, (valueSystem ?? new JsonPathValueSystem()), evaluator); }
        public JsonPathNode[] SelectNodes(string expression, params JsonPathScriptEvaluator[] lambdas) { return Context.Evaluate(expression, lambdas); }
        public T[] SelectNodes<T>(string expression, params JsonPathScriptEvaluator[] lambdas) { return SelectNodes(default(T), expression, lambdas); }
        public T[] SelectNodes<T>(T prototype, string expression, params JsonPathScriptEvaluator[] lambdas) { return SelectNodes(expression, lambdas).As<T>(); }
    }

    internal class JsonPathValueSystem : IJsonPathValueSystem
    {
        private readonly IDictionary<Type, Tuple<IDictionary<string, System.Reflection.PropertyInfo>, string[]>> cache = new Dictionary<Type, Tuple<IDictionary<string, System.Reflection.PropertyInfo>, string[]>>();

        private Tuple<IDictionary<string, System.Reflection.PropertyInfo>, string[]> GetEntry(Type type)
        {
            Tuple<IDictionary<string, System.Reflection.PropertyInfo>, string[]> entry;
            if (cache.TryGetValue(type, out entry)) return entry;
            var propertyInfos = type.GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);
            var properties = propertyInfos.ToDictionary(propertyInfo => propertyInfo.Name);
            cache.Add(type, entry = new Tuple<IDictionary<string, System.Reflection.PropertyInfo>, string[]>(properties, properties.Keys.ToArray()));
            return entry;
        }

        private System.Reflection.PropertyInfo GetProperty(Type type, string propertyName)
        {
            Tuple<IDictionary<string, System.Reflection.PropertyInfo>, string[]> entry = GetEntry(type);
            System.Reflection.PropertyInfo propertyInfo;
            return (entry.Item1.TryGetValue(propertyName, out propertyInfo) ? propertyInfo : null);
        }

        private string[] GetPropertyNames(Type type)
        {
            return GetEntry(type).Item2;
        }

        public bool HasMember(object value, string member)
        {
            if (value != null)
            {
                if (IsArray(value))
                {
                    int index = ParseInt(member, -1);
                    return ((index >= 0) && (index < ((IList)value).Count));
                }
                if (IsObject(value))
                    return ((value is IDictionary) ? ((IDictionary)value).Contains(member) : (GetProperty(value.GetType(), member) != null));
                return false;
            }
            return false;
        }

        public object GetMemberValue(object value, string member)
        {
            if (value == null) return null;
            if (IsArray(value))
            {
                int index = ParseInt(member, -1);
                return (((index >= 0) && (index < ((IList)value).Count)) ? ((IList)value)[index] : null);
            }
            if (IsObject(value))
                return ((value is IDictionary) ? ((IDictionary)value)[member] : GetProperty(value.GetType(), member).GetValue(value, null));
            return null;
        }

        public IEnumerable GetMembers(object value)
        {
            return ((value is IDictionary) ? ((IDictionary)value).Keys : GetPropertyNames(value.GetType()));
        }

        public bool IsObject(object value)
        {
            return ((value is IDictionary) || (!IsArray(value) && !IsPrimitive(value)));
        }

        public bool IsArray(object value)
        {
            return (value is IList);
        }

        public bool IsPrimitive(object value)
        {
            return ((value is string) || ((value != null) && value.GetType().IsValueType));
        }

        private int ParseInt(string s, int defaultValue)
        {
            int result;
            return int.TryParse(s, out result) ? result : defaultValue;
        }
    }


    public sealed class JsonParserOptions
    {
        internal bool Validate()
        {
            return ((StringBufferLength > byte.MaxValue) && (TypeCacheCapacity > byte.MaxValue));
        }

        public int StringBufferLength { get; set; }
        public int TypeCacheCapacity { get; set; }
    }

    [SuppressMessage("ReSharper", "UnusedParameter.Local")]
    public class JsonParser
    {
        private const string TypeTag1 = "__type";
        private const string TypeTag2 = "$type";

        private static readonly byte[] HEX = new byte[128];
        private static readonly bool[] HXD = new bool[128];
        private static readonly char[] ESC = new char[128];
        private static readonly bool[] IDF = new bool[128];
        private static readonly bool[] IDN = new bool[128];
        private const int EOF = (char.MaxValue + 1);
        private const int ANY = 0;

        private readonly IDictionary<Type, int> rtti = new Dictionary<Type, int>();
        private readonly TypeInfo[] types;

        private readonly Func<int, object>[] parse = new Func<int, object>[128];
        private readonly StringBuilder lsb = new StringBuilder();
        private readonly char[] stc = new char[1];
        private readonly char[] lbf;
        private TextReader str;
        private Func<int, int> Char;
        private Action<int> Next;
        private Func<int> Read;
        private Func<int> Space;
        private string txt;
        private readonly int lbs;
        private int len;
        private int lln;
        private int chr;
        private int at;

        internal class EnumInfo
        {
            internal string Name;
            internal object Value;
            internal int Len;
        }

        internal class ItemInfo
        {
            internal string Name;
            internal Action<object, JsonParser, int, int> Set;
            internal Type Type;
            internal int Outer;
            internal int Len;
            internal int Atm;
        }

        internal class TypeInfo
        {
            private static readonly HashSet<Type> WellKnown = new HashSet<Type>();

            internal Func<Type, object, object, int, Func<object, object>> Select;
            internal Func<JsonParser, int, object> Parse;
            internal Func<object> Ctor;
            internal EnumInfo[] Enums;
            internal ItemInfo[] Props;
#if FASTER_GETPROPINFO
            internal char[] Mlk;
            internal int Mnl;
#endif
            internal ItemInfo Dico;
            internal ItemInfo List;
            internal bool IsAnonymous;
            internal bool IsNullable;
            internal bool IsStruct;
            internal bool IsEnum;
            internal bool Closed;
            internal Type VType;
            internal Type EType;
            internal Type Type;
            internal int Inner;
            internal int Key;
            internal int T;

            static TypeInfo()
            {
                WellKnown.Add(typeof(bool));
                WellKnown.Add(typeof(char));
                WellKnown.Add(typeof(sbyte));
                WellKnown.Add(typeof(byte));
                WellKnown.Add(typeof(short));
                WellKnown.Add(typeof(ushort));
                WellKnown.Add(typeof(int));
                WellKnown.Add(typeof(uint));
                WellKnown.Add(typeof(long));
                WellKnown.Add(typeof(ulong));
                WellKnown.Add(typeof(float));
                WellKnown.Add(typeof(double));
                WellKnown.Add(typeof(decimal));
                WellKnown.Add(typeof(Guid));
                WellKnown.Add(typeof(DateTime));
                WellKnown.Add(typeof(DateTimeOffset));
                WellKnown.Add(typeof(string));
            }

            private static Func<object> GetCtor(Type clr, bool list)
            {
                var type = (!list ? ((clr == typeof(object)) ? typeof(Dictionary<string, object>) : clr) : typeof(List<>).MakeGenericType(clr));
                var ctor = type.GetConstructor(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.CreateInstance, null, System.Type.EmptyTypes, null);
                if (ctor != null)
                {
                    var dyn = new System.Reflection.Emit.DynamicMethod("", typeof(object), null, typeof(string), true);
                    var il = dyn.GetILGenerator();
                    il.Emit(System.Reflection.Emit.OpCodes.Newobj, ctor);
                    il.Emit(System.Reflection.Emit.OpCodes.Ret);
                    return (Func<object>)dyn.CreateDelegate(typeof(Func<object>));
                }
                return null;
            }

            private static Func<object> GetCtor(Type clr, Type key, Type value)
            {
                var type = typeof(Dictionary<,>).MakeGenericType(key, value);
                var ctor = (((type != clr) && clr.IsClass) ? clr : type).GetConstructor(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.CreateInstance, null, System.Type.EmptyTypes, null);
                var dyn = new System.Reflection.Emit.DynamicMethod("", typeof(object), null, typeof(string), true);
                var il = dyn.GetILGenerator();
                il.Emit(System.Reflection.Emit.OpCodes.Newobj, ctor);
                il.Emit(System.Reflection.Emit.OpCodes.Ret);
                return (Func<object>)dyn.CreateDelegate(typeof(Func<object>));
            }

            private static EnumInfo[] GetEnumInfos(Type type)
            {
                var actual = (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>)) ? type.GetGenericArguments()[0] : type);
                var einfo = System.Enum.GetNames(actual).ToDictionary(name => name, name => new EnumInfo { Name = name, Value = System.Enum.Parse(actual, name), Len = name.Length });
                return einfo.OrderBy(pair => pair.Key).Select(pair => pair.Value).ToArray();
            }

            private ItemInfo GetItemInfo(Type type, string name, System.Reflection.MethodInfo setter)
            {
                var method = new System.Reflection.Emit.DynamicMethod("Set" + name, null, new[] { typeof(object), typeof(JsonParser), typeof(int), typeof(int) }, typeof(string), true);
                var nType = (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>)) ? new[] { type.GetGenericArguments()[0] } : null);
                var parse = GetParserParse(GetParseName(type));
                var il = method.GetILGenerator();
                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_0);
                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_2);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, parse);
                if (type.IsValueType && (parse.ReturnType == typeof(object)))
                    il.Emit(System.Reflection.Emit.OpCodes.Unbox_Any, type);
                if (parse.ReturnType.IsValueType && (type == typeof(object)))
                    il.Emit(System.Reflection.Emit.OpCodes.Box, parse.ReturnType);
                if (nType != null)
                {
                    var con = typeof(Nullable<>).MakeGenericType(nType).GetConstructor(nType);
                    if (con != null)
                        il.Emit(System.Reflection.Emit.OpCodes.Newobj, con);
                }
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, setter);
                il.Emit(System.Reflection.Emit.OpCodes.Ret);
                return new ItemInfo { Type = type, Name = name, Set = (Action<object, JsonParser, int, int>)method.CreateDelegate(typeof(Action<object, JsonParser, int, int>)), Len = name.Length };
            }

            private ItemInfo GetItemInfo(Type type, Type key, Type value, System.Reflection.MethodInfo setter)
            {
                var method = new System.Reflection.Emit.DynamicMethod("Add", null, new[] { typeof(object), typeof(JsonParser), typeof(int), typeof(int) }, typeof(string), true);
                var sBrace = typeof(JsonParser).GetMethod("SBrace", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                var eBrace = typeof(JsonParser).GetMethod("EBrace", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                var kColon = typeof(JsonParser).GetMethod("KColon", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                var sComma = typeof(JsonParser).GetMethod("SComma", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                var vnType = (value.IsGenericType && (value.GetGenericTypeDefinition() == typeof(Nullable<>)) ? new[] { value.GetGenericArguments()[0] } : null);
                var knType = (key.IsGenericType && (key.GetGenericTypeDefinition() == typeof(Nullable<>)) ? new[] { key.GetGenericArguments()[0] } : null);
                var vParse = GetParserParse(GetParseName(value));
                var kParse = GetParserParse(GetParseName(key));
                var il = method.GetILGenerator();
                il.DeclareLocal(key);
                il.DeclareLocal(value);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, sBrace);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, kColon);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_3);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, kParse);
                if (key.IsValueType && (kParse.ReturnType == typeof(object)))
                    il.Emit(System.Reflection.Emit.OpCodes.Unbox_Any, key);
                if (kParse.ReturnType.IsValueType && (key == typeof(object)))
                    il.Emit(System.Reflection.Emit.OpCodes.Box, kParse.ReturnType);
                if (knType != null)
                {
                    var con = typeof(Nullable<>).MakeGenericType(knType).GetConstructor(knType);
                    if (con!=null)
                        il.Emit(System.Reflection.Emit.OpCodes.Newobj, con);
                }

                il.Emit(System.Reflection.Emit.OpCodes.Stloc_0);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, sComma);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, kColon);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_2);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, vParse);
                if (value.IsValueType && (vParse.ReturnType == typeof(object)))
                    il.Emit(System.Reflection.Emit.OpCodes.Unbox_Any, value);
                if (vParse.ReturnType.IsValueType && (value == typeof(object)))
                    il.Emit(System.Reflection.Emit.OpCodes.Box, vParse.ReturnType);
                if (vnType != null)
                {
                    var con = typeof(Nullable<>).MakeGenericType(vnType).GetConstructor(vnType);
                    if (con != null)
                        il.Emit(System.Reflection.Emit.OpCodes.Newobj, con);
                }
                il.Emit(System.Reflection.Emit.OpCodes.Stloc_1);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, eBrace);

                il.Emit(System.Reflection.Emit.OpCodes.Ldarg_0);
                il.Emit(System.Reflection.Emit.OpCodes.Ldloc_0);
                il.Emit(System.Reflection.Emit.OpCodes.Ldloc_1);
                il.Emit(System.Reflection.Emit.OpCodes.Callvirt, setter);
                il.Emit(System.Reflection.Emit.OpCodes.Ret);
                return new ItemInfo { Type = type, Name = String.Empty, Set = (Action<object, JsonParser, int, int>)method.CreateDelegate(typeof(Action<object, JsonParser, int, int>)) };
            }

            private static Type GetEnumUnderlyingType(Type enumType)
            {
                return enumType.GetFields(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic)[0].FieldType;
            }

            protected string GetParseName(Type type)
            {
                var actual = (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(Nullable<>)) ? type.GetGenericArguments()[0] : type);
                var name = (!WellKnown.Contains(actual) ? ((actual.IsEnum && WellKnown.Contains(GetEnumUnderlyingType(actual))) ? GetEnumUnderlyingType(actual).Name : null) : actual.Name);
                return ((name != null) ? String.Concat("Parse", name) : null);
            }

            protected System.Reflection.MethodInfo GetParserParse(string pName)
            {
                return typeof(JsonParser).GetMethod((pName ?? "Val"), System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
            }

            protected TypeInfo(Type type, int self, Type eType, Type kType, Type vType)
            {
                var props = ((self > 2) ? type.GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public) : new System.Reflection.PropertyInfo[] { });
                var infos = new Dictionary<string, ItemInfo>();
                IsAnonymous = ((eType == null) && (type.Name[0] == '<') && type.IsSealed);
                IsStruct = type.IsValueType;
                IsNullable = type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
                IsEnum = IsNullable ? (VType = type.GetGenericArguments()[0]).IsEnum : type.IsEnum;
                EType = eType;
                Type = type;
                T = self;
                if (!IsAnonymous)
                {
                    Ctor = (((kType != null) && (vType != null)) ? GetCtor(Type, kType, vType) : GetCtor((EType ?? Type), (EType != null)));
                    foreach (PropertyInfo property in props)
                    {
                        System.Reflection.PropertyInfo pi;
                        System.Reflection.MethodInfo set;
                        if ((pi = property).CanWrite && ((set = pi.GetSetMethod()).GetParameters().Length == 1))
                            infos.Add(pi.Name, GetItemInfo(pi.PropertyType, pi.Name, set));
                    }
                    Dico = (((kType != null) && (vType != null)) ? GetItemInfo(Type, kType, vType, typeof(Dictionary<,>).MakeGenericType(kType, vType).GetMethod("Add", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public)) : null);
                    List = ((EType != null) ? GetItemInfo(EType, String.Empty, typeof(List<>).MakeGenericType(EType).GetMethod("Add", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public)) : null);
                    Enums = (IsEnum ? GetEnumInfos(Type) : null);
                }
                else
                {
                    var args = type.GetConstructors()[0].GetParameters();
                    for (var i = 0; i < args.Length; i++) infos.Add(args[i].Name, new ItemInfo { Type = args[i].ParameterType, Name = args[i].Name, Atm = i, Len = args[i].Name.Length });
                }
                Props = infos.OrderBy(pair => pair.Key).Select(pair => pair.Value).ToArray();
#if FASTER_GETPROPINFO
                if (Props.Length > 0)
                {
                    Mnl = Props.Max(p => p.Name.Length) + 1;
                    Mlk = new char[Mnl * (Props.Length + 1)];
                    for (var i = 0; i < Props.Length; i++)
                    {
                        var p = Props[i]; var n = p.Name; var l = n.Length;
                        n.CopyTo(0, Mlk, Mnl * i, l);
                    }
                }
                else
                {
                    Mnl = 1;
                    Mlk = new char[1];
                }
#endif
            }
        }

        internal class TypeInfo<T> : TypeInfo
        {
            internal Func<JsonParser, int, T> Value;

            private Func<JsonParser, int, R> GetParseFunc<R>(string pName)
            {
                var parse = GetParserParse(pName ?? "Key");
                if (parse != null)
                {
                    var method = new System.Reflection.Emit.DynamicMethod(parse.Name, typeof(R), new[] { typeof(JsonParser), typeof(int) }, typeof(string), true);
                    var il = method.GetILGenerator();
                    il.Emit(System.Reflection.Emit.OpCodes.Ldarg_0);
                    il.Emit(System.Reflection.Emit.OpCodes.Ldarg_1);
                    il.Emit(System.Reflection.Emit.OpCodes.Callvirt, parse);
                    il.Emit(System.Reflection.Emit.OpCodes.Ret);
                    return (Func<JsonParser, int, R>)method.CreateDelegate(typeof(Func<JsonParser, int, R>));
                }
                return null;
            }

            internal TypeInfo(int self, Type eType, Type kType, Type vType)
                : base(typeof(T), self, eType, kType, vType)
            {
                var value = (Value = GetParseFunc<T>(GetParseName(typeof(T))));
                Parse = (parser, outer) => value(parser, outer);
            }
        }

        static JsonParser()
        {
            for (char c = '0'; c <= '9'; c++) { HXD[c] = true; HEX[c] = (byte)(c - 48); }
            for (char c = 'A'; c <= 'F'; c++) { HXD[c] = HXD[c + 32] = true; HEX[c] = HEX[c + 32] = (byte)(c - 55); }
            ESC['/'] = '/'; ESC['\\'] = '\\';
            ESC['b'] = '\b'; ESC['f'] = '\f'; ESC['n'] = '\n'; ESC['r'] = '\r'; ESC['t'] = '\t'; ESC['u'] = 'u';
            for (int c = ANY; c < 128; c++) if (ESC[c] == ANY) ESC[c] = (char)c;
            for (int c = '0'; c <= '9'; c++) IDN[c] = true;
            IDF['_'] = IDN['_'] = true;
            for (int c = 'A'; c <= 'Z'; c++) IDF[c] = IDN[c] = IDF[c + 32] = IDN[c + 32] = true;
        }

        private Exception Error(string message) { return new Exception(System.String.Format("{0} at {1} (found: '{2}')", message, at, ((chr < EOF) ? ("\\" + chr) : "EOF"))); }
        private void Reset(Func<int> read, Action<int> next, Func<int, int> achar, Func<int> space) { at = -1; chr = ANY; Read = read; Next = next; Char = achar; Space = space; }

        private int StreamSpace()
        {
            if (chr > ' ')
                return chr;
            while ((chr = (str.Read(stc, 0, 1) > 0) ? stc[0] : EOF) <= ' ')
            {
            }
            return chr;
        }

        private int StreamRead()
        {
            return (chr = (str.Read(stc, 0, 1) > 0) ? stc[0] : EOF);
        }
        private void StreamNext(int ch)
        {
            if (chr != ch) throw Error("Unexpected character");
            chr = ((str.Read(stc, 0, 1) > 0) ? stc[0] : EOF);
        }
        private int StreamChar(int ch)
        {
            if (lln >= lbs)
            {
                if (lsb.Length == 0)
                    lsb.Append(new string(lbf, 0, lln));
                lsb.Append((char)ch);
            }
            else
                lbf[lln++] = (char)ch;
            return (chr = (str.Read(stc, 0, 1) > 0) ? stc[0] : EOF);
        }

        private int StringSpace()
        {
            if (chr > ' ') return chr;
            while ((++at < len) && ((chr = txt[at]) <= ' '))
            {
            }
            return chr;
        }

        private int StringRead() { return (chr = (++at < len) ? txt[at] : EOF); }
        private void StringNext(int ch) { if (chr != ch) throw Error("Unexpected character"); chr = ((++at < len) ? txt[at] : EOF); }
        private int StringChar(int ch)
        {
            if (lln >= lbs)
            {
                if (lsb.Length == 0)
                    lsb.Append(new string(lbf, 0, lln));
                lsb.Append((char)ch);
            }
            else
                lbf[lln++] = (char)ch;
            return (chr = (++at < len) ? txt[at] : EOF);
        }

        private int Esc(int ec)
        {
            int cp = 0, ic = -1, ch;
            if (ec == 'u')
            {
                while ((++ic < 4) && ((ch = Read()) <= 'f') && HXD[ch]) { cp *= 16; cp += HEX[ch]; }
                if (ic < 4) throw Error("Invalid Unicode character");
                ch = cp;
            }
            else
                ch = ESC[ec];
            Read();
            return ch;
        }

        private void CharEsc(int ec)
        {
            int cp = 0, ic = -1, ch;
            if (ec == 'u')
            {
                while ((++ic < 4) && ((ch = Read()) <= 'f') && HXD[ch]) { cp *= 16; cp += HEX[ch]; }
                if (ic < 4) throw Error("Invalid Unicode character");
                ch = cp;
            }
            else
                ch = ESC[ec];
            Char(ch);
        }

        private EnumInfo GetEnumInfo(TypeInfo type)
        {
            var a = type.Enums;
            int n = a.Length, c = 0, i = 0;
            if (n <= 0)
                return null;
            while (true)
            {
                int ch;
                if ((ch = chr) == '"')
                {
                    Read();
                    return (((i < n) && (c > 0)) ? a[i] : null);
                }
                bool e = ch == '\\';
                if (e)
                    ch = Read();
                if (ch < EOF)
                {
                    if (!e || (ch >= 128))
                        Read();
                    else
                        ch = Esc(ch);
                }
                else
                    break;
                EnumInfo ei;
                while ((i < n) && ((c >= (ei = a[i]).Len) || (ei.Name[c] != ch))) i++;
                c++;
            }
            return null;
        }

        private bool ParseBoolean(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            if (k)
                ch = Read();
            switch (ch)
            {
                case 'f': Read(); Next('a'); Next('l'); Next('s'); Next('e'); if (k) Next('"'); return false;
                case 't': Read(); Next('r'); Next('u'); Next('e'); if (k) Next('"'); return true;
                default: throw Error("Bad boolean");
            }
        }

        private char ParseChar(int outer)
        {
            int ch = Space();
            if (ch == '"')
            {
                ch = Read();
                lln = 0;
                switch (ch) { case '\\': ch = Read(); CharEsc(ch); Next('"'); break; default: Char(ch); Next('"'); break; }
                return lbf[0];
            }
            throw Error("Bad character");
        }

        private short ParseSByte(int outer)
        {
            sbyte it = 1;
            sbyte n = 0;
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && (ch != '-') && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (sbyte)e.Value;
                }
            }
            if (ch == '-') { ch = Read(); it = (sbyte)-it; }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (sbyte)(it * (ch - 48)); } ch = Read(); }
            if (!b) throw Error("Bad number (sbyte)"); if (k) Next('"');
            return n;
        }

        private byte ParseByte(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            byte n = 0;
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (byte)e.Value;
                }
            }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (byte)(ch - 48); } ch = Read(); }
            if (!b) throw Error("Bad number (byte)"); if (k) Next('"');
            return n;
        }

        private short ParseInt16(int outer)
        {
            short it = 1, n = 0;
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && (ch != '-') && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (short)e.Value;
                }
            }
            if (ch == '-') { ch = Read(); it = (short)-it; }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (short)(it * (ch - 48)); } ch = Read(); }
            if (!b) throw Error("Bad number (short)"); if (k) Next('"');
            return n;
        }

        private ushort ParseUInt16(int outer)
        {
            ushort n = 0;
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (ushort)e.Value;
                }
            }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (ushort)(ch - 48); } ch = Read(); }
            if (!b) throw Error("Bad number (ushort)"); if (k) Next('"');
            return n;
        }

        private int ParseInt32(int outer)
        {
            int it = 1;
            int n = 0;
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && (ch != '-') && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (int)e.Value;
                }
            }
            if (ch == '-') { ch = Read(); it = -it; }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (it * (ch - 48)); } ch = Read(); }
            if (!b) throw Error("Bad number (int)"); if (k) Next('"');
            return n;
        }

        private uint ParseUInt32(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            uint n = 0;
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (uint)e.Value;
                }
            }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (uint)(ch - 48); } ch = Read(); }
            if (!b) throw Error("Bad number (uint)"); if (k) Next('"');
            return n;
        }

        private long ParseInt64(int outer)
        {
            long it = 1, n = 0;
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && (ch != '-') && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (long)e.Value;
                }
            }
            if (ch == '-') { ch = Read(); it = -it; }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += it * (ch - 48); } ch = Read(); }
            if (!b) throw Error("Bad number (long)"); if (k) Next('"');
            return n;
        }

        private ulong ParseUInt64(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            ulong n = 0;
            if (k)
            {
                ch = Read();
                TypeInfo t;
                if ((t = types[outer]).IsEnum && ((ch < '0') || (ch > '9')))
                {
                    var e = GetEnumInfo(t);
                    if (e == null) throw Error(System.String.Format("Bad enum value ({0})", t.Type.FullName));
                    return (ulong)e.Value;
                }
            }
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) { checked { n *= 10; n += (ulong)(ch - 48); } ch = Read(); }
            if (!b) throw Error("Bad number (ulong)"); if (k) Next('"');
            return n;
        }

        private float ParseSingle(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            lsb.Length = 0;
            lln = 0;
            if (k)
                ch = Read();
            if (ch == '-') ch = Char(ch);
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) ch = Char(ch);
            if (ch == '.') { ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if ((ch == 'e') || (ch == 'E')) { ch = Char(ch); if ((ch == '-') || (ch == '+')) ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if (!b) throw Error("Bad number (float)"); if (k) Next('"');
            var s = ((lsb.Length > 0) ? lsb.ToString() : new string(lbf, 0, lln));
            return float.Parse(s, CultureInfo.InvariantCulture);
        }

        private double ParseDouble(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            lsb.Length = 0; lln = 0;
            if (k)
                ch = Read();
            if (ch == '-') ch = Char(ch);
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) ch = Char(ch);
            if (ch == '.') { ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if ((ch == 'e') || (ch == 'E')) { ch = Char(ch); if ((ch == '-') || (ch == '+')) ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if (!b) throw Error("Bad number (double)"); if (k) Next('"');
            var s = ((lsb.Length > 0) ? lsb.ToString() : new string(lbf, 0, lln));
            return double.Parse(s, CultureInfo.InvariantCulture);
        }

        private decimal ParseDecimal(int outer)
        {
            int ch = Space();
            bool k = (outer > 0) && (ch == '"');
            lsb.Length = 0; lln = 0;
            if (k)
                ch = Read();
            if (ch == '-') ch = Char(ch);
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) ch = Char(ch);
            if (ch == '.') { ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if (!b) throw Error("Bad number (decimal)"); if (k) Next('"');
            var s = ((lsb.Length > 0) ? lsb.ToString() : new string(lbf, 0, lln));
            return decimal.Parse(s, CultureInfo.InvariantCulture);
        }

        private Guid ParseGuid(int outer)
        {
            var s = ParseString(0);
            if (!String.IsNullOrWhiteSpace(s))
                return new Guid(s);
            throw Error("Bad GUID");
        }

        private DateTime ParseDateTime(int outer)
        {
            DateTime dateTime;
            if (!DateTime.TryParse(ParseString(0), System.Globalization.CultureInfo.CurrentCulture, System.Globalization.DateTimeStyles.RoundtripKind, out dateTime))
                throw Error("Bad date/time");
            return dateTime;
        }

        private DateTimeOffset ParseDateTimeOffset(int outer)
        {
            DateTimeOffset dateTimeOffset;
            if (!DateTimeOffset.TryParse(ParseString(0), System.Globalization.CultureInfo.CurrentCulture, System.Globalization.DateTimeStyles.RoundtripKind, out dateTimeOffset))
                throw Error("Bad date/time offset");
            return dateTimeOffset;
        }

        private string ParseString(int outer)
        {
            var ch = Space();
            if (ch == '"')
            {
                Read();
                lsb.Length = 0;
                lln = 0;
                while (true)
                {
                    if ((ch = chr) == '"')
                    {
                        Read();
                        return ((lsb.Length > 0) ? lsb.ToString() : new string(lbf, 0, lln));
                    }
                    bool e = ch == '\\';
                    if (e)
                        ch = Read();
                    if (ch < EOF)
                    {
                        if (!e || (ch >= 128))
                            Char(ch);
                        else
                            CharEsc(ch);


                    }
                    else
                        break;
                }
            }
            if (ch == 'n')
                return (string)Null(0);
            throw Error((outer >= 0) ? "Bad string" : "Bad key");
        }

        private void PastKey()
        {
            var ch = Space();
            if (ch != '"') throw Error("Bad key");
            Read();
            while (true)
            {
                if ((ch = chr) == '"')
                {
                    Read();
                    return;
                }
                bool e = ch == '\\';
                if (e)
                    ch = Read();
                if (ch < EOF)
                {
                    if (!e || (ch >= 128))
                        Read();
                    else
                    {
                        Esc(ch);
                    }
                }
                else break;
            }
            throw Error("Bad key");
        }

#if !FASTER_GETPROPINFO
        private ItemInfo GetPropInfo(ItemInfo[] a)
        {
            int ch = Space(), n = a.Length, c = 0, i = 0;
            if (ch == '"')
            {
                Read();
                while (true)
                {
                    if ((ch = chr) == '"')
                    {
                        Read();
                        return (((i < n) && (c > 0)) ? a[i] : null);
                    }
                    bool e = ch == '\\';
                    if (e)
                        ch = Read();
                    if (ch < EOF)
                    {
                        if (!e || (ch >= 128)) Read();
                        else
                        {
                            ch = Esc(ch);
                        }
                    }
                    else break;
                    ItemInfo pi;
                    while ((i < n) && ((c >= (pi = a[i]).Len) || (pi.Name[c] != ch))) i++;
                    c++;
                }
            }
            throw Error("Bad key");
        }
#else
        private unsafe ItemInfo FasterGetPropInfo(TypeInfo type)
        {
            var p = type.Props; var m = type.Mlk; int ch = Space(), l = type.Mnl, n = p.Length, i = 0;
            if (ch == '"')
            {
                fixed (char* c = m)
                {
                    char* a = c, z = c + n * l;
                    while (i <= n)
                    {
                        if ((ch = Read()) == '"') { Read(); return i < n && c < a ? p[i] : null; }
                        while (*a != ch) { if (z <= a) break; a += l; i++; }
                        a++;
                    }
                    return null;
                }
            }
            throw Error("Bad key");
        }
#endif

        private object Error(int outer) { throw Error("Bad value"); }
        private object Null(int outer) { Read(); Next('u'); Next('l'); Next('l'); return null; }
        private object False(int outer) { Read(); Next('a'); Next('l'); Next('s'); Next('e'); return false; }
        private object True(int outer) { Read(); Next('r'); Next('u'); Next('e'); return true; }

        private object Num(int outer)
        {
            var ch = chr;
            lsb.Length = 0; lln = 0;
            if (ch == '-') ch = Char(ch);
            var b = (ch >= '0') && (ch <= '9');
            if (b) while ((ch >= '0') && (ch <= '9')) ch = Char(ch);
            if (ch == '.') { ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if ((ch == 'e') || (ch == 'E')) { ch = Char(ch); if ((ch == '-') || (ch == '+')) ch = Char(ch); while ((ch >= '0') && (ch <= '9')) ch = Char(ch); }
            if (!b) throw Error("Bad number");
            return ((lsb.Length > 0) ? lsb.ToString() : new string(lbf, 0, lln));
        }

        private object Key(int outer) { return ParseString(-1); }

        private object Str(int outer)
        {
            var s = ParseString(0);
            if ((outer != 2) || ((s != null) && (s.Length == 1)))
                return ((outer == 2) ? (object)s[0] : s);
            throw Error("Bad character");
        }

        private static object Cat(TypeInfo atinfo, object[] atargs)
        {
            foreach (var prop in atinfo.Props.Where(prop => prop.Type.IsValueType && (atargs[prop.Atm] == null)))
            {
                atargs[prop.Atm] = Activator.CreateInstance(prop.Type);
            }
            return Activator.CreateInstance(atinfo.Type, atargs);
        }

        private object Parse(int typed)
        {
            if ((Space() != 'n') || !types[typed].IsNullable)
                return (types[typed].Type.IsValueType ? (types[typed].IsNullable ? types[types[typed].Inner].Parse(this, types[typed].Inner) : types[typed].Parse(this, typed)) : Val(typed));
            return Null(0);
        }

        private object Obj(int outer)
        {
            var cached = types[outer]; var isAnon = cached.IsAnonymous; var hash = types[cached.Key]; var select = cached.Select; var props = cached.Props; var ctor = cached.Ctor;
            var atargs = (isAnon ? new object[props.Length] : null);
            var mapper = (null as Func<object, object>);
            var typed = ((outer > 0) && (cached.Dico == null) && ((ctor != null) || isAnon));
            var keyed = hash.T;
            var ch = chr;
            if (ch != '{') throw Error("Bad object");
            Read();
            ch = Space();
            if (ch == '}')
            {
                Read();
                return (isAnon ? Cat(cached, atargs) : ctor());
            }
            object obj = null;
            while (ch < EOF)
            {
#if FASTER_GETPROPINFO
                    var prop = (typed ? FasterGetPropInfo(cached) : null);
#else
                var prop = (typed ? GetPropInfo(props) : null);
#endif
                var slot = (!typed ? Parse(keyed) : null);
                Func<object, object> read = null;
                Space();
                Next(':');
                if (slot != null)
                {
                    if ((@select == null) || ((read = @select(cached.Type, obj, slot, -1)) != null))
                    {
                        var val = Parse(cached.Inner);
                        var key = (slot as string);
                        if (obj == null)
                        {
                            if ((key != null) && ((String.CompareOrdinal(key, TypeTag1) == 0) || (String.CompareOrdinal(key, TypeTag2) == 0)))
                            {
                                obj = (((key = (val as string)) != null) ? (cached = types[Entry(Type.GetType(key, true))]).Ctor() : ctor());
                                typed = !(obj is IDictionary);
                            }
                            else
                                obj = ctor();
                        }
                        if (!typed)
                            ((IDictionary)obj).Add(slot, val);
                    }
                    else
                        Val(0);
                }
                else if (prop != null)
                {
                    if (!isAnon)
                    {
                        if ((@select == null) || ((read = @select(cached.Type, obj, prop.Name, -1)) != null))
                        {
                            if ((Space() != 'n') || !types[prop.Outer].IsNullable)
                            {
                                obj = (obj ?? ctor());
                                prop.Set(obj, this, prop.Outer, 0);
                            }
                            else
                                Null(0);
                        }
                        else
                            Val(0);
                    }
                    else
                        atargs[prop.Atm] = Parse(prop.Outer);
                }
                else
                    Val(0);
                mapper = (mapper ?? read);
                ch = Space();
                if (ch == '}')
                {
                    mapper = (mapper ?? Identity);
                    Read();
                    return mapper(isAnon ? Cat(cached, atargs) : (obj ?? ctor()));
                }
                Next(',');
                ch = Space();
            }
            throw Error("Bad object");
        }

        private void SBrace() { Next('{'); }
        private void EBrace() { Space(); Next('}'); }
        private void KColon() { PastKey(); Space(); Next(':'); }
        private void SComma() { Space(); Next(','); }

        private object Arr(int outer)
        {
            var cached = types[(outer != 0) ? outer : 1]; var select = cached.Select; var dico = (cached.Dico != null);
            var mapper = (null as Func<object, object>);
            var items = (dico ? cached.Dico : cached.List);
            var val = cached.Inner;
            var key = cached.Key;
            var ch = chr;
            var i = -1;
            if (ch != '[') throw Error("Bad array");
            Read();
            ch = Space();
            var obj = cached.Ctor();
            if (ch == ']')
            {
                Read();
                if (!cached.Type.IsArray) return obj;
                IList list = (IList)obj;
                var array = Array.CreateInstance(cached.EType, list.Count);
                list.CopyTo(array, 0);
                return array;
            }
            while (ch < EOF)
            {
                Func<object, object> read = null;
                i++;
                if ((ch == 'n') && types[val].IsNullable && !dico)
                {
                    Null(0);
                    ((IList)obj).Add(null);
                }
                else if (dico || (@select == null) || ((read = @select(cached.Type, obj, null, i)) != null))
                    items.Set(obj, this, (types[val].IsNullable ? types[val].Inner : val), (types[key].IsNullable ? types[key].Inner : key));
                else
                    Val(0);
                mapper = (mapper ?? read);
                ch = Space();
                if (ch == ']')
                {
                    mapper = (mapper ?? Identity);
                    Read();
                    if (!cached.Type.IsArray) return mapper(obj);
                    IList list = (IList)obj;
                    var array = Array.CreateInstance(cached.EType, list.Count);
                    list.CopyTo(array, 0);
                    return mapper(array);
                }
                Next(',');
                ch = Space();
            }
            throw Error("Bad array");
        }

        private object Val(int outer)
        {
            return parse[Space() & 0x7f](outer);
        }

        private static Type GetElementType(Type type)
        {
            if (type.IsArray)
                return type.GetElementType();
            if ((type != typeof(string)) && typeof(System.Collections.IEnumerable).IsAssignableFrom(type))
                return (type.IsGenericType ? type.GetGenericArguments()[0] : typeof(object));
            return null;
        }

        private static Type Realizes(Type type, Type generic)
        {
            while (true)
            {
                var itfs = type.GetInterfaces();
                if (itfs.Any(it => it.IsGenericType && it.GetGenericTypeDefinition() == generic))
                {
                    return type;
                }
                if (type.IsGenericType && type.GetGenericTypeDefinition() == generic)
                    return type;
                if (type.BaseType == null) return null;
                type = type.BaseType;
            }
        }

        private static bool GetKeyValueTypes(Type type, out Type key, out Type value)
        {
            var generic = (Realizes(type, typeof(Dictionary<,>)) ?? Realizes(type, typeof(IDictionary<,>)));
            var kvPair = ((generic != null) && (generic.GetGenericArguments().Length == 2));
            value = (kvPair ? generic.GetGenericArguments()[1] : null);
            key = (kvPair ? generic.GetGenericArguments()[0] : null);
            return kvPair;
        }

        private int Closure(int outer, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> filter)
        {
            if (types[outer].Closed) return outer;
            var prop = types[outer].Props;
            types[outer].Closed = true;
            foreach (ItemInfo p in prop)
                p.Outer = Entry(p.Type, filter);
            return outer;
        }

        private int Entry(Type type, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> filter = null)
        {
            Func<Type, object, object, int, Func<object, object>> select;
            int outer;
            if (!rtti.TryGetValue(type, out outer))
            {
                Type kt, vt;
                bool dico = GetKeyValueTypes(type, out kt, out vt);
                var et = (!dico ? GetElementType(type) : null);
                outer = rtti.Count;
                types[outer] = (TypeInfo)Activator.CreateInstance(typeof(TypeInfo<>).MakeGenericType(type), System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic, null, new object[] { outer, et, kt, vt }, null);
                rtti.Add(type, outer);
                types[outer].Inner = ((et != null) ? Entry(et, filter) : (dico ? Entry(vt, filter) : (types[outer].IsNullable ? Entry(types[outer].VType, filter) : 0)));
                if (dico) types[outer].Key = Entry(kt, filter);
            }
            if ((filter != null) && filter.TryGetValue(type, out select))
                types[outer].Select = select;
            return Closure(outer, filter);
        }

        private T DoParse<T>(string input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> filter)
        {
            var outer = Entry(typeof(T), filter);
            len = input.Length;
            txt = input;
            Reset(StringRead, StringNext, StringChar, StringSpace);
            return (typeof(T).IsValueType ? ((TypeInfo<T>)types[outer]).Value(this, outer) : (T)Val(outer));
        }

        private T DoParse<T>(TextReader input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> filter)
        {
            var outer = Entry(typeof(T), filter);
            str = input;
            Reset(StreamRead, StreamNext, StreamChar, StreamSpace);
            return (typeof(T).IsValueType ? ((TypeInfo<T>)types[outer]).Value(this, outer) : (T)Val(outer));
        }

        public static object Identity(object obj) { return obj; }

        public static readonly Func<object, object> Skip = null;

        public JsonParser() : this(null) { }

        public JsonParser(JsonParserOptions options)
        {
            options = (options ?? new JsonParserOptions { StringBufferLength = (byte.MaxValue + 1), TypeCacheCapacity = (byte.MaxValue + 1) });
            if (!options.Validate()) throw new ArgumentException("Invalid JSON parser options", "options");
            lbf = new char[lbs = options.StringBufferLength];
            types = new TypeInfo[options.TypeCacheCapacity];
            parse['n'] = Null; parse['f'] = False; parse['t'] = True;
            parse['0'] = parse['1'] = parse['2'] = parse['3'] = parse['4'] =
            parse['5'] = parse['6'] = parse['7'] = parse['8'] = parse['9'] =
            parse['-'] = Num; parse['"'] = Str; parse['{'] = Obj; parse['['] = Arr;
            for (var input = 0; input < 128; input++) parse[input] = (parse[input] ?? Error);
            Entry(typeof(object));
            Entry(typeof(List<object>));
            Entry(typeof(char));
        }

        public object Parse(string input) { return Parse<object>(input); }

        public object Parse(string input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse<object>(input, mappers); }

        public object Parse(TextReader input) { return Parse<object>(input); }

        public object Parse(TextReader input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse<object>(input, mappers); }

        public object Parse(Stream input) { return Parse<object>(input); }

        public object Parse(Stream input, Encoding encoding) { return Parse<object>(input, encoding); }

        public object Parse(Stream input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse<object>(input, mappers); }

        public object Parse(Stream input, Encoding encoding, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse<object>(input, encoding, mappers); }

        public T Parse<T>(string input) { return Parse(default(T), input); }

        public T Parse<T>(T prototype, string input) { return Parse<T>(input, null); }

        public T Parse<T>(string input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse(default(T), input, mappers); }

        public T Parse<T>(T prototype, string input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers)
        {
            if (input == null) throw new ArgumentNullException("input", "cannot be null");
            return DoParse<T>(input, mappers);
        }

        public T Parse<T>(TextReader input) { return Parse(default(T), input); }

        public T Parse<T>(T prototype, TextReader input) { return Parse<T>(input, null); }

        public T Parse<T>(TextReader input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse(default(T), input, mappers); }

        public T Parse<T>(T prototype, TextReader input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers)
        {
            if (input == null) throw new ArgumentNullException("input", "cannot be null");
            return DoParse<T>(input, mappers);
        }

        public T Parse<T>(Stream input) { return Parse(default(T), input); }

        public T Parse<T>(T prototype, Stream input) { return Parse<T>(input, null as Encoding); }

        public T Parse<T>(Stream input, Encoding encoding) { return Parse(default(T), input, encoding); }

        public T Parse<T>(T prototype, Stream input, Encoding encoding) { return Parse<T>(input, encoding, null); }

        public T Parse<T>(Stream input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse(default(T), input, mappers); }

        public T Parse<T>(T prototype, Stream input, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse<T>(input, null, mappers); }

        public T Parse<T>(Stream input, Encoding encoding, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers) { return Parse(default(T), input, encoding, mappers); }

        public T Parse<T>(T prototype, Stream input, Encoding encoding, IDictionary<Type, Func<Type, object, object, int, Func<object, object>>> mappers)
        {
            if (input == null) throw new ArgumentNullException("input", "cannot be null");
            return DoParse<T>((encoding != null) ? new StreamReader(input, encoding) : new StreamReader(input), mappers);
        }
    }




    public delegate void JsonPathResultAccumulator(object value, string[] indicies);

    public interface IJsonPathValueSystem
    {
        bool HasMember(object value, string member);
        object GetMemberValue(object value, string member);
        IEnumerable GetMembers(object value);
        bool IsObject(object value);
        bool IsArray(object value);
        bool IsPrimitive(object value);
    }

    public interface IJsonPathContext
    {
        JsonPathNode[] SelectNodes(string expression);
    }

    [Serializable]
    public sealed class JsonPathNode
    {
        private readonly object value;
        private readonly string path;

        public JsonPathNode(object value) : this(value, null) { }
        public JsonPathNode(object value, string path)
        {
            if (path != null)
            {
                if (path.Length == 0)
                    throw new ArgumentException("path");
            }

            this.value = value;
            this.path = (path ?? "(dynamic)");
        }

        public object Value
        {
            get { return value; }
        }

        public string Path
        {
            get { return path; }
        }

        public override string ToString()
        {
            return Path + " = " + Value;
        }

        public static object[] ValuesFrom(ICollection nodes)
        {
            object[] values = new object[nodes != null ? nodes.Count : 0];

            if (values.Length <= 0) return values;
            int i = 0;
            foreach (JsonPathNode node in nodes)
                values[i++] = node.Value;

            return values;
        }

        public static string[] PathsFrom(ICollection nodes)
        {
            string[] paths = new string[nodes != null ? nodes.Count : 0];

            if (paths.Length <= 0) return paths;
            int i = 0;
            foreach (JsonPathNode node in nodes)
                paths[i++] = node.Path;

            return paths;
        }
    }

    public sealed class JsonPathContext : IJsonPathContext
    {
        public static readonly JsonPathContext Default = new JsonPathContext();
        public readonly IDictionary<string, Delegate> Lambdas = new Dictionary<string, Delegate>();

        public JsonPathContext() : this(new object()) { }
        public JsonPathContext(object data) : this(data, null) { }
        public JsonPathContext(object data, IJsonPathValueSystem system) : this(data, system, null) { }
        public JsonPathContext(object data, IJsonPathValueSystem system, JsonPathScriptEvaluator eval) { Data = data; ValueSystem = system; ScriptEvaluator = eval; }

        #region IJsonPathContext implementation
        public JsonPathNode[] SelectNodes(string expression)
        {
            return (new JsonPathContext(Data, ValueSystem, ScriptEvaluator)).Evaluate(expression);
        }
        #endregion

        public JsonPathScriptEvaluator ScriptEvaluator { get; private set; }

        public IJsonPathValueSystem ValueSystem { get; private set; }

        public object Data { get; private set; }

        internal JsonPathNode[] Evaluate(string expression, params JsonPathScriptEvaluator[] lambdas)
        {
            IList<JsonPathNode> result = new List<JsonPathNode>();
            SelectTo(expression, result, lambdas);
            return result.ToArray();
        }

        private void SelectTo(string expression, IList<JsonPathNode> result, params JsonPathScriptEvaluator[] lambdas)
        {
            ListAccumulator accumulator = new ListAccumulator(result);
            SelectTo(expression, accumulator.Put, lambdas);
        }

        private void SelectTo(string expression, JsonPathResultAccumulator output, params JsonPathScriptEvaluator[] lambdas)
        {
            if (output == null)
                throw new ArgumentNullException("output");

            Interpreter i = new Interpreter(this, output, ValueSystem, ScriptEvaluator);

            expression = Normalize(expression);

            if (expression.Length >= 1 && expression[0] == '$') // ^\$:?
                expression = expression.Substring(expression.Length >= 2 && expression[1] == ';' ? 2 : 1);

            i.Trace(expression, Data, "$", (lambdas ?? new JsonPathScriptEvaluator[] { }));
        }

        private static Regex RegExp(string pattern) { return RegExp(pattern, false); }

        private static Regex RegExp(string pattern, bool compiled)
        {
            return new Regex(pattern, (compiled ? RegexOptions.Compiled | RegexOptions.ECMAScript : RegexOptions.ECMAScript));
        }

        private static string Normalize(string expr)
        {
            NormalizationSwap swap = new NormalizationSwap();
            expr = RegExp(@"[\['](\??\(.*?\))[\]']").Replace(expr, swap.Capture);
            expr = RegExp(@"'?\.'?|\['?").Replace(expr, ";");
            expr = RegExp(@";;;|;;").Replace(expr, ";..;");
            expr = RegExp(@";$|'?\]|'$").Replace(expr, string.Empty);
            expr = RegExp(@"#([0-9]+)").Replace(expr, swap.Yield);
            return expr;
        }

        private sealed class NormalizationSwap
        {
            private readonly List<string> subx = new List<string>(4);

            public string Capture(Match match)
            {
                subx.Add(match.Groups[1].Value);
                return "[#" + (subx.Count - 1).ToString(CultureInfo.InvariantCulture) + "]";
            }

            public string Yield(Match match)
            {
                var index = int.Parse(match.Groups[1].Value, CultureInfo.InvariantCulture);
                return subx[index];
            }
        }

        public static string AsBracketNotation(string[] indicies)
        {
            if (indicies == null)
                throw new ArgumentNullException("indicies");

            StringBuilder sb = new StringBuilder();

            foreach (string index in indicies)
            {
                if (sb.Length == 0)
                {
                    sb.Append('$');
                }
                else
                {
                    sb.Append('[');
                    if (Interpreter.REGEXP_BRACKET.IsMatch(index))
                        sb.Append(index);
                    else
                        sb.Append('\'').Append(index).Append('\'');
                    sb.Append(']');
                }
            }

            return sb.ToString();
        }

        private static int ParseInt(string str, int defaultValue = 0)
        {
            if (string.IsNullOrEmpty(str))
                return defaultValue;

            try
            {
                return int.Parse(str, NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture);
            }
            catch (FormatException)
            {
                return defaultValue;
            }
        }

        private sealed class Interpreter
        {
            private static readonly Regex REGEXP_SEGMENTED = RegExp(@"^(-?[0-9]*):(-?[0-9]*):?([0-9]*)$", true);
            private static readonly Regex REGEXP_ITEMIZED = RegExp(@"'?,'?", true);
            public static readonly Regex REGEXP_BRACKET = RegExp(@"^[0-9*]+$", true);
            private static readonly Regex REGEXP_FILTER = RegExp(@"^\?\((.*?)\)$", true);

            private readonly JsonPathResultAccumulator output;
            private readonly JsonPathScriptEvaluator eval;
            private readonly IJsonPathValueSystem system;
            private readonly Regex filter;

            private static readonly char[] colon = { ':' };
            private static readonly char[] semicolon = { ';' };

            private delegate void WalkCallback(object member, string loc, string expr, object value, string path, Delegate[] lambdas, int clambda);

            private readonly JsonPathContext Bindings;

            public Interpreter(JsonPathContext bindings, JsonPathResultAccumulator output, IJsonPathValueSystem valueSystem, JsonPathScriptEvaluator eval)
            {
                Bindings = bindings;
                this.output = output;
                this.eval = (eval ?? NullEval);
                system = valueSystem;
                filter = REGEXP_FILTER;
            }

            public void Trace(string expression, object value, string path, Delegate[] lambdas)
            {
                if (string.IsNullOrEmpty(expression))
                {
                    Store(path, value);
                    return;
                }

                int i = expression.IndexOf(';');
                string atom = i >= 0 ? expression.Substring(0, i) : expression;
                string tail = i >= 0 ? expression.Substring(i + 1) : String.Empty;

                if (value != null && system.HasMember(value, atom))
                {
                    Trace(tail, Index(value, atom), path + ";" + atom, lambdas);
                }
                else if (atom == "*")
                {
                    Walk(atom, tail, value, path, WalkWild, lambdas, -1);
                }
                else if (atom == "..")
                {
                    Trace(tail, value, path, lambdas);
                    Walk(atom, tail, value, path, WalkTree, lambdas, -1);
                }
                else if (atom.Length > 2 && atom[0] == '(' && atom[atom.Length - 1] == ')') // [(exp)]
                {
                    Trace(Eval(atom, value, path.Substring(path.LastIndexOf(';') + 1)) + ";" + tail, value, path, lambdas);
                }
                else if (atom.Length > 2 && atom[0] == '{' && atom[atom.Length - 1] == '}') // [{N}]
                {
                    var lambda = lambdas[int.Parse(atom.Substring(1, atom.Length - 2), CultureInfo.InvariantCulture)];
                    Trace(lambda.DynamicInvoke(atom, value, Bindings) + ";" + tail, value, path, lambdas);
                }
                else if (atom.Length > 3 && atom[0] == '?' && atom[1] == '(' && atom[atom.Length - 1] == ')') // [?(exp)]
                {
                    Walk(atom, tail, value, path, WalkFiltered, lambdas, -1);
                }
                else if (atom.Length > 3 && atom[0] == '?' && atom[1] == '{' && atom[atom.Length - 1] == '}') // [?{N}]
                {
                    Walk(atom, tail, value, path, WalkFiltered, lambdas, int.Parse(atom.Substring(2, atom.Length - 3), CultureInfo.InvariantCulture));
                }
                else if (REGEXP_SEGMENTED.IsMatch(atom)) // [start:end:step] Phyton slice syntax
                {
                    Slice(atom, tail, value, path, lambdas);
                }
                else if (atom.IndexOf(',') >= 0) // [name1,name2,...]
                {
                    foreach (string part in REGEXP_ITEMIZED.Split(atom))
                        Trace(part + ";" + tail, value, path, lambdas);
                }
            }

            private void Store(string path, object value)
            {
                if (path != null)
                    output(value, path.Split(semicolon));
            }

            private void Walk(string loc, string expression, object value, string path, WalkCallback callback, Delegate[] lambdas, int clambda)
            {
                if (system.IsPrimitive(value))
                    return;

                if (system.IsArray(value))
                {
                    IList list = (IList)value;
                    for (int i = 0; i < list.Count; i++)
                        callback(i, loc, expression, value, path, lambdas, clambda);
                }
                else if (system.IsObject(value))
                {
                    foreach (string key in system.GetMembers(value))
                        callback(key, loc, expression, value, path, lambdas, clambda);
                }
            }

            private void WalkWild(object member, string loc, string expression, object value, string path, Delegate[] lambdas, int clambda)
            {
                Trace(member + ";" + expression, value, path, lambdas);
            }

            private void WalkTree(object member, string loc, string expression, object value, string path, Delegate[] lambdas, int clambda)
            {
                object result = Index(value, member.ToString());
                if (result != null && !system.IsPrimitive(result))
                    Trace("..;" + expression, result, path + ";" + member, lambdas);
            }

            private void WalkFiltered(object member, string loc, string expression, object value, string path, Delegate[] lambdas, int clambda)
            {
                string script = filter.Replace(loc, "$1");
                object result = ((clambda < 0) ? Eval(script, value, member.ToString(), true) : lambdas[clambda].DynamicInvoke(script, value, Bindings));
                if ((result != null) && (result as bool? ?? ((!(result is string)) || !String.IsNullOrEmpty((string)result))))
                    Trace(member + ";" + expression, value, path, lambdas);
            }

            private void Slice(string loc, string expression, object value, string path, Delegate[] lambdas)
            {
                IList list = value as IList;

                if (list == null)
                    return;

                int length = list.Count;
                string[] parts = loc.Split(colon);
                int start = ParseInt(parts[0]);
                int end = ParseInt(parts[1], list.Count);
                int step = parts.Length > 2 ? ParseInt(parts[2], 1) : 1;
                start = (start < 0) ? Math.Max(0, start + length) : Math.Min(length, start);
                end = (end < 0) ? Math.Max(0, end + length) : Math.Min(length, end);
                for (int i = start; i < end; i += step)
                    Trace(i + ";" + expression, value, path, lambdas);
            }

            private object Index(object obj, string member)
            {
                return system.GetMemberValue(obj, member);
            }

            private object Eval(string script, object value, string member, bool forFilter = false)
            {
                object target = (forFilter ? Index(value, member) : value);
                Type type = ((target != null) ? target.GetType() : typeof(object));
                Delegate func;
                if (!Bindings.Lambdas.TryGetValue(script, out func))
                {
                    string lambda = String.Format("(string script, ~ value, IJsonPathContext context) => (object)({0})", script.Replace("@", "value"));
                    type = typeof(Func<,,,>).MakeGenericType(typeof(string), (forFilter ? type : (target is IEnumerable ? type : typeof(object))), typeof(IJsonPathContext), typeof(object));
                    func = (eval(lambda, type, Bindings) as Delegate);
                    if (func != null) Bindings.Lambdas.Add(script, func);
                }
                return ((func != null) ? func.DynamicInvoke(script, target, Bindings) : eval(script, target, Bindings));
            }

            private static object NullEval(string expression, object value, IJsonPathContext context)
            {
                //
                // @ symbol in expression must be interpreted specially to resolve
                // to value. In JavaScript, the implementation would look 
                // like:
                //
                // return obj && value && eval(expression.replace(/@/g, "value"));
                //

                return null;
            }
        }

        private sealed class ListAccumulator
        {
            private readonly IList<JsonPathNode> list;

            public ListAccumulator(IList<JsonPathNode> list)
            {
                this.list = list;
            }

            public void Put(object value, string[] indicies)
            {
                list.Add(new JsonPathNode(value, AsBracketNotation(indicies)));
            }
        }
    }
}

//
// C# implementation of JSONPath[1]
//
// Copyright (c) 2007 Atif Aziz (http://www.raboof.com/)
// Licensed under The MIT License
//
// Supported targets:
//
//  - Mono 1.1 or later
//  - Microsoft .NET Framework 1.0 or later
//
// [1]  JSONPath - XPath for JSON
//      http://code.google.com/p/jsonpath/
//      Copyright (c) 2007 Stefan Goessner (goessner.net)
//      Licensed under The MIT License
//

#region The MIT License
//
// The MIT License
//
// Copyright (c) 2007 Atif Aziz (http://www.raboof.com/)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
#endregion