UnityEditorInternal.JSONParser.ParseString C# (CSharp) Method

        private JSONValue ParseString()
        {
            string o = "";
            this.Next();
            while (this.idx < this.len)
            {
                object[] objArray1;
                string str2;
                int num = this.json.IndexOfAny(endcodes, this.idx);
                if (num < 0)
                {
                    throw new JSONParseException("missing '\"' to end string at " + this.PosMsg());
                }
                o = o + this.json.Substring(this.idx, num - this.idx);
                if (this.json[num] == '"')
                {
                    this.cur = this.json[num];
                    this.idx = num;
                    break;
                }
                num++;
                if (num >= this.len)
                {
                    throw new JSONParseException("End of json while parsing while parsing string at " + this.PosMsg());
                }
                char ch = this.json[num];
                switch (ch)
                {
                    case 'r':
                        o = o + '\r';
                        goto Label_029E;

                    case 't':
                        o = o + '\t';
                        goto Label_029E;

                    case 'u':
                        str2 = "";
                        if ((num + 4) >= this.len)
                        {
                            throw new JSONParseException("End of json while parsing while parsing unicode char near " + this.PosMsg());
                        }
                        break;

                    default:
                        if (((ch == '"') || (ch == '/')) || (ch == '\\'))
                        {
                            o = o + ch;
                        }
                        else if (ch == 'b')
                        {
                            o = o + '\b';
                        }
                        else if (ch == 'f')
                        {
                            o = o + '\f';
                        }
                        else
                        {
                            if (ch != 'n')
                            {
                                goto Label_026B;
                            }
                            o = o + '\n';
                        }
                        goto Label_029E;
                }
                str2 = (str2 + this.json[num + 1] + this.json[num + 2]) + this.json[num + 3] + this.json[num + 4];
                try
                {
                    int num2 = int.Parse(str2, NumberStyles.AllowHexSpecifier);
                    o = o + ((char) num2);
                }
                catch (FormatException)
                {
                    throw new JSONParseException("Invalid unicode escape char near " + this.PosMsg());
                }
                num += 4;
                goto Label_029E;
            Label_026B:
                objArray1 = new object[] { "Invalid escape char '", ch, "' near ", this.PosMsg() };
                throw new JSONParseException(string.Concat(objArray1));
            Label_029E:
                this.idx = num + 1;
            }
            if (this.idx >= this.len)
            {
                throw new JSONParseException("End of json while parsing while parsing string near " + this.PosMsg());
            }
            this.cur = this.json[this.idx];
            this.Next();
            return new JSONValue(o);
        }