/// <summary>
        /// Consume a JSON numeric token
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeNumber(
            this JsonParserContext ctx,
            bool throws
            )
        {
            const string Leading = "-0123456789";
            const string Allowed = Leading + ".Ee+";

            if (ctx.ConsumeWhiteSpace().ConsumeAnyChar(Leading, throws).IsSucceeded)
            {
                JSonReader src = ctx.Begin();

                for (int p = src.Position, len = src.Text.Length; p < len; p++)
                {
                    if (Allowed.IndexOf(src.Text[p]) < 0)
                    {
                        ctx.SetResult(
                            new JValue {
                            BoxedValue = double.Parse(src.Text.Substring(src.Position - 1, p - src.Position + 1))
                        }
                            );

                        src.Position = p;
                        break;
                    }
                }
            }

            return(ctx);
        }
        /// <summary>
        /// Consume a JSON array
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeArray(
            this JsonParserContext ctx,
            bool throws
            )
        {
            if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("[", throws).IsSucceeded)
            {
                var  jctr        = new JArray();
                bool shouldThrow = false;

                do
                {
                    ctx.Begin();
                    if (ctx.ConsumeValue(shouldThrow).IsSucceeded)
                    {
                        jctr.Add((JToken)ctx.Result);
                    }
                    shouldThrow = true;
                }while ((char)ctx.ConsumeWhiteSpace().ConsumeAnyChar(",]", true).Result == ',');

                ctx.SetResult(jctr);
            }

            return(ctx);
        }
        /// <summary>
        /// Consume a JSON object
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeObject(
            this JsonParserContext ctx,
            bool throws
            )
        {
            if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("{", throws).IsSucceeded)
            {
                var  jctr        = new JObject();
                bool shouldThrow = false;

                do
                {
                    ctx.Begin();
                    if (ctx.ConsumeString(shouldThrow).IsSucceeded)
                    {
                        var name = (string)(JValue)ctx.Result;
                        ctx.ConsumeWhiteSpace()
                        .ConsumeAnyChar(":", true)
                        .ConsumeValue(true);

                        jctr.Add(name, (JToken)ctx.Result);
                    }

                    shouldThrow = true;
                }while ((char)ctx.ConsumeWhiteSpace().ConsumeAnyChar(",}", true).Result == ',');

                ctx.SetResult(jctr);
            }

            return(ctx);
        }
        /// <summary>
        /// Consume all the characters in the specified sequence
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="sequence"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeAllChars(
            this JsonParserContext ctx,
            string sequence,
            bool throws
            )
        {
            JSonReader src = ctx.Begin();

            for (int q = 0, p = src.Position; q < sequence.Length; q++, p++)
            {
                if (src.Text[p] != sequence[q])
                {
                    if (throws)
                    {
                        throw new JsonParseException("Expected char not found.");
                    }

                    return(ctx);
                }
            }

            src.Position += sequence.Length;
            ctx.SetResult(sequence);
            return(ctx);
        }
        /// <summary>
        /// Consume the JSON "null" token
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeNull(
            this JsonParserContext ctx,
            bool throws
            )
        {
            if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("n", throws).IsSucceeded)
            {
                ctx.ConsumeAllChars("ull", true);
                ctx.SetResult(
                    new JValue {
                    BoxedValue = null
                }
                    );
            }

            return(ctx);
        }
        /// <summary>
        /// Consume a JSON boolean token
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeBoolean(
            this JsonParserContext ctx,
            bool throws
            )
        {
            if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("ft", throws).IsSucceeded)
            {
                bool flag = (char)ctx.Result == 't';
                ctx.ConsumeAllChars(flag ? "rue" : "alse", true);
                ctx.SetResult(
                    new JValue {
                    BoxedValue = flag
                }
                    );
            }

            return(ctx);
        }
        /// <summary>
        /// Consume a JSON string token
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeString(
            this JsonParserContext ctx,
            bool throws
            )
        {
            if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("\"", throws).IsSucceeded)
            {
                JSonReader src = ctx.Begin();

                for (int p = src.Position, len = src.Text.Length; p < len; p++)
                {
                    if ((src.Text[p]) == '"' && (p > 0 ? (src.Text[p - 1]) != '\\' : true))
                    {
                        string temp = src.Text.Substring(src.Position, p - src.Position);

                        int index = 0;

                        while (index < temp.Length)
                        {
                            if (temp[index] == '\\')
                            {
                                temp = temp.Substring(0, index) + temp.Substring(index + 1, temp.Length - (index + 1));
                            }
                            index++;
                        }

                        ctx.SetResult(
                            new JValue {
                            BoxedValue = temp
                        }
                            );

                        src.Position = p + 1;
                        break;
                    }
                }
            }

            return(ctx);
        }
        /// <summary>
        /// Consume any character (at least one) in the specified set
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="charset"></param>
        /// <param name="throws"></param>
        /// <returns></returns>
        private static JsonParserContext ConsumeAnyChar(
            this JsonParserContext ctx,
            string charset,
            bool throws
            )
        {
            JSonReader src = ctx.Begin();

            char c;

            if (charset.IndexOf(c = src.Text[src.Position]) >= 0)
            {
                src.Position++;
                ctx.SetResult(c);
            }
            else if (throws)
            {
                throw new JsonParseException("Expected char not found.");
            }

            return(ctx);
        }