QuickLib/Quick.Json.Serializer.pas

{ ***************************************************************************

  Copyright (c) 2015-2018 Kike Pérez

  Unit        : Quick.JSON.Serializer
  Description : Json Serializer
  Author      : Kike Pérez
  Version     : 1.5
  Created     : 21/05/2018
  Modified    : 06/12/2018

  This file is part of QuickLib: https://github.com/exilon/QuickLib

 ***************************************************************************

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

 *************************************************************************** }

unit Quick.Json.Serializer;

{$i QuickLib.inc}

interface

uses
  Classes,
  SysUtils,
  Rtti,
  TypInfo,
  {$IFDEF FPC}
   rttiutils,
   fpjson,
   jsonparser,
   strUtils,
   //jsonreader,
   //fpjsonrtti,
   Quick.Json.fpc.Compatibility,
  {$ELSE}
    {$IFDEF DELPHIXE7_UP}
    System.Json,
    {$ENDIF}
    {$IFDEF DELPHIRX103_UP}
    System.Generics.Collections,
    {$ENDIF}
  {$ENDIF}
  DateUtils,
  Quick.Commons,
  Quick.JSON.Utils;

type

  EJsonSerializeError = class(Exception);
  EJsonDeserializeError = class(Exception);

  {$IFNDEF FPC}
  TNotSerializableProperty = class(TCustomAttribute);

  TCommentProperty = class(TCustomAttribute)
  private
    fComment : string;
  public
    constructor Create(const aComment: string);
    property Comment : string read fComment;
  end;

  TCustomNameProperty = class(TCustomAttribute)
  private
    fName : string;
  public
    constructor Create(const aName: string);
    property Name : string read fName;
  end;
  {$ENDIF}

  IJsonSerializer = interface
  ['{CA26F7AE-F1FE-41BE-9C23-723A687F60D1}']
    function JsonToObject(aType: TClass; const aJson: string): TObject; overload;
    function JsonToObject(aObject: TObject; const aJson: string): TObject; overload;
    function ObjectToJson(aObject : TObject; aIndent : Boolean = False): string;
  end;

  TSerializeLevel = (slPublicProperty, slPublishedProperty);

  PValue = ^TValue;

  TRTTIJson = class
  private
    fSerializeLevel : TSerializeLevel;
    fUseEnumNames : Boolean;
    function GetValue(aAddr: Pointer; aType: TRTTIType): TValue; overload;
    function GetValue(aAddr: Pointer; aTypeInfo: PTypeInfo): TValue; overload;
    function IsAllowedProperty(aObject : TObject; const aPropertyName : string) : Boolean;
    function IsGenericList(aObject : TObject) : Boolean;
    function GetPropertyValue(Instance : TObject; const PropertyName : string) : TValue;
    procedure SetPropertyValue(Instance : TObject; aPropInfo : PPropInfo; aValue : TValue); overload;
    procedure SetPropertyValue(Instance : TObject; const PropertyName : string; aValue : TValue); overload;
    {$IFDEF FPC}
    function FloatProperty(aObject : TObject; aPropInfo: PPropInfo): string;
    function GetPropType(aPropInfo: PPropInfo): PTypeInfo;
    procedure LoadSetProperty(aInstance : TObject; aPropInfo: PPropInfo; const aValue: string);
    {$ENDIF}
  public
    constructor Create(aSerializeLevel : TSerializeLevel);
    property UseEnumNames : Boolean read fUseEnumNames write fUseEnumNames;
    {$IFNDEF FPC}
    function DeserializeDynArray(aTypeInfo : PTypeInfo; aObject : TObject; const aJsonArray: TJSONArray) : TValue;
    function DeserializeRecord(aRecord : TValue; aObject : TObject; const aJson : TJSONObject) : TValue;
    {$ELSE}
    procedure DeserializeDynArray(aTypeInfo: PTypeInfo; const aPropertyName : string; aObject: TObject; const aJsonArray: TJSONArray);
    {$ENDIF}
    function DeserializeClass(aType : TClass; const aJson : TJSONObject) : TObject;
    function DeserializeObject(aObject : TObject; const aJson : TJSONObject) : TObject; overload;
    {$IFNDEF FPC}
    function DeserializeList(aObject: TObject; const aName : string; const aJson: TJSONObject) : TObject;
    {$ENDIF}
    function DeserializeProperty(aObject : TObject; const aName : string; aProperty : TRttiProperty; const aJson : TJSONObject) : TObject; overload;
    {$IFNDEF FPC}
    function DeserializeType(aObject : TObject; aType : TTypeKind; aTypeInfo : PTypeInfo; const aValue: string) : TValue;
    {$ELSE}
    function DeserializeType(aObject : TObject; aType : TTypeKind; const aPropertyName, aValue: string) : TValue;
    {$ENDIF}
    {$IFNDEF FPC}
    function Serialize(const aName : string; aValue : TValue) : TJSONPair; overload;
    {$ELSE}
    function Serialize(aObject : TObject; aType : TTypeKind; const aPropertyName : string) : TJSONPair;
    function Serialize(const aName : string; aValue : TValue) : TJSONPair;
    {$ENDIF}
    function Serialize(aObject : TObject) : TJSONObject; overload;
  end;

  TJsonSerializer = class(TInterfacedObject,IJsonSerializer)
  strict private
    fSerializeLevel : TSerializeLevel;
    fUseEnumNames : Boolean;
    fRTTIJson : TRTTIJson;
  private
    procedure SetUseEnumNames(const Value: Boolean);
  public
    constructor Create(aSerializeLevel : TSerializeLevel);
    destructor Destroy; override;
    property SerializeLevel : TSerializeLevel read fSerializeLevel;
    property UseEnumNames : Boolean read fUseEnumNames write SetUseEnumNames;
    function JsonToObject(aType : TClass; const aJson: string) : TObject; overload;
    function JsonToObject(aObject : TObject; const aJson: string) : TObject; overload;
    function ObjectToJson(aObject : TObject; aIndent : Boolean = False): string;
  end;

  PPByte = ^PByte;

resourcestring
  cNotSupportedDataType = 'Not supported "%s" data type "%s"';
  cNotSerializable = 'Object is not serializable';

implementation

{ TRTTIJson }

{$IFNDEF FPC}
function TRTTIJson.DeserializeDynArray(aTypeInfo: PTypeInfo; aObject: TObject; const aJsonArray: TJSONArray) : TValue;
var
  rType: PTypeInfo;
  len: NativeInt;
  pArr: Pointer;
  rItemValue: TValue;
  i: Integer;
  objClass: TClass;
  ctx : TRttiContext;
  json : TJSONObject;
  rDynArray : TRttiDynamicArrayType;
  propObj : TObject;
begin
  if GetTypeData(aTypeInfo).DynArrElType = nil then Exit;
  if not assigned(aJsonArray) then Exit;

  len := aJsonArray.Count;
  rType := GetTypeData(aTypeInfo).DynArrElType^;
  pArr := nil;
  DynArraySetLength(pArr,aTypeInfo, 1, @len);
  try
    TValue.Make(@pArr,aTypeInfo, Result);
    rDynArray := ctx.GetType(Result.TypeInfo) as TRTTIDynamicArrayType;

    for i := 0 to aJsonArray.Count - 1 do
    begin
      rItemValue := nil;
      case rType.Kind of
        tkClass :
          begin
            if aJsonArray.Items[i] is TJSONObject then
            begin
              propObj := GetValue(PPByte(Result.GetReferenceToRawData)^ +rDynArray.ElementType.TypeSize * i, rDynArray.ElementType).AsObject;
              if propObj = nil then
              begin
                objClass := rType.TypeData.ClassType;
                rItemValue := DeserializeClass(objClass, TJSONObject(aJsonArray.Items[i]));
              end
              else
              begin
                DeserializeObject(propObj,TJSONObject(aJsonArray.Items[i]));
              end;
            end;
          end;
        tkRecord :
          begin
            json := TJSONObject(aJsonArray.Items[i]);
            rItemValue := DeserializeRecord(GetValue(PPByte(Result.GetReferenceToRawData)^ +rDynArray.ElementType.TypeSize * i,
                                            rDynArray.ElementType),aObject,json);
          end;
        tkMethod, tkPointer, tkClassRef ,tkInterface, tkProcedure :
          begin
            //skip these properties
          end
      else
        begin
          rItemValue := DeserializeType(aObject,rType.Kind,aTypeInfo,aJsonArray.Items[i].Value);
        end;
      end;
      if not rItemValue.IsEmpty then Result.SetArrayElement(i,rItemValue);
    end;
    //aProperty.SetValue(aObject,rValue);
  finally
    DynArrayClear(pArr,aTypeInfo);
  end;
end;
{$ELSE}
procedure TRTTIJson.DeserializeDynArray(aTypeInfo: PTypeInfo; const aPropertyName : string; aObject: TObject; const aJsonArray: TJSONArray);
var
  rType: PTypeInfo;
  len: NativeInt;
  pArr: Pointer;
  rItemValue: TValue;
  i: Integer;
  objClass: TClass;
  propObj : TObject;
  rValue : TValue;
begin
  if GetTypeData(aTypeInfo).ElType2 = nil then Exit;
  len := aJsonArray.Count;
  rType := GetTypeData(aTypeInfo).ElType2;
  pArr := nil;
  DynArraySetLength(pArr,aTypeInfo, 1, @len);
  try
    TValue.Make(@pArr,aTypeInfo, rValue);
    for i := 0 to aJsonArray.Count - 1 do
    begin
      rItemValue := nil;
      case rType.Kind of
        tkClass :
          begin
            if aJsonArray.Items[i] is TJSONObject then
            begin
              propObj := GetValue(PPByte(rValue.GetReferenceToRawData)^ +GetTypeData(aTypeInfo).elSize * i, GetTypeData(aTypeInfo).ElType2).AsObject;
              if propObj = nil then
              begin
                objClass := GetTypeData(aTypeInfo).ClassType;
                rItemValue := DeserializeClass(objClass, TJSONObject(aJsonArray.Items[i]));
              end
              else
              begin
                DeserializeObject(propObj,TJSONObject(aJsonArray.Items[i]));
              end;
            end;
          end;
        tkRecord :
          begin
            {json := TJSONObject(aJsonArray.Items[i]);
            rItemValue := DeserializeRecord(GetValue(PPByte(Result.GetReferenceToRawData)^ +rDynArray.ElementType.TypeSize * i,
                                            rDynArray.ElementType),aObject,json);  }
          end;
        tkMethod, tkPointer, tkClassRef ,tkInterface, tkProcedure :
          begin
            //skip these properties
          end
      else
        begin
          rItemValue := DeserializeType(aObject,GetTypeData(aTypeInfo).ElType2.Kind,aPropertyName,aJsonArray.Items[i].Value);
        end;
      end;
      if not rItemValue.IsEmpty then rValue.SetArrayElement(i,rItemValue);
    end;
    //aProperty.SetValue(aObject,rValue);
    SetDynArrayProp(aObject,GetPropInfo(aObject,aPropertyName),pArr);
  finally
    DynArrayClear(pArr,aTypeInfo);
  end;
end;
{$ENDIF}

{$IFNDEF FPC}
function TRTTIJson.DeserializeRecord(aRecord : TValue; aObject : TObject; const aJson : TJSONObject) : TValue;
var
  ctx : TRttiContext;
  rRec : TRttiRecordType;
  rField : TRttiField;
  rValue : TValue;
  member : TJSONPair;
  jArray : TJSONArray;
  json : TJSONObject;
  objClass : TClass;
  propobj : TObject;
begin
  rRec := ctx.GetType(aRecord.TypeInfo).AsRecord;
  try
    for rField in rRec.GetFields do
    begin
      rValue := nil;
      member := TJSONPair(aJson.GetValue(rField.Name));
      if member <> nil then
      case rField.FieldType.TypeKind of
        tkDynArray :
          begin
            jArray := TJSONObject.ParseJSONValue(member.ToJSON) as TJSONArray;
            try
              rValue := DeserializeDynArray(rField.FieldType.Handle,aObject,jArray);
            finally
              jArray.Free;
            end;
          end;
        tkClass :
          begin
            //if (member.JsonValue is TJSONObject) then
            begin
              propobj := rField.GetValue(@aRecord).AsObject;
              json := TJSONObject.ParseJSONValue(member.ToJson) as TJSONObject;
              try
                if propobj = nil then
                begin
                  objClass := rField.FieldType.Handle^.TypeData.ClassType;// aProperty.PropertyType.Handle^.TypeData.ClassType;
                  rValue := DeserializeClass(objClass,json);
                end
                else
                begin
                  DeserializeObject(propobj,json);
                end;
              finally
                json.Free;
              end;
            end
          end;
      else
        begin
          rValue := DeserializeType(aObject,rField.FieldType.TypeKind,rField.FieldType.Handle,member.toJson);
        end;
      end;
      if not rValue.IsEmpty then rField.SetValue(aRecord.GetReferenceToRawData,rValue);
    end;
    Result := aRecord;
  finally
    ctx.Free;
  end;
end;
{$ENDIF}

constructor TRTTIJson.Create(aSerializeLevel: TSerializeLevel);
begin
  fSerializeLevel := aSerializeLevel;
  fUseEnumNames := True;
end;

function TRTTIJson.DeserializeClass(aType: TClass; const aJson: TJSONObject): TObject;
begin
  Result := nil;
  if (aJson = nil) or (aJson.Count = 0) then Exit;

  Result := aType.Create;
  try
    Result := DeserializeObject(Result,aJson);
  except
    on E : Exception do
    begin
      Result.Free;
      raise EJsonDeserializeError.CreateFmt('Deserialize error class "%s" : %s',[aType.ClassName,e.Message]);
    end;
  end;
end;

function TRTTIJson.DeserializeObject(aObject: TObject; const aJson: TJSONObject): TObject;
var
  ctx: TRttiContext;
  rType: TRttiType;
  rProp: TRttiProperty;
  {$IFNDEF FPC}
  attr: TCustomAttribute;
  {$ENDIF}
  propertyname : string;
begin
  Result := aObject;

  if (aJson = nil) or (aJson.Count = 0) or (Result = nil) then Exit;

  //if IsGenericList(aObject) then
  //begin
  //  Result := DeserializeList(Result,aObject.ClassName,aJson);
  //  Exit;
  //end;

  try
    rType := ctx.GetType(aObject.ClassInfo);
    try
      for rProp in rType.GetProperties do
      begin
        {$IFNDEF FPC}
        if ((fSerializeLevel = slPublicProperty) and (rProp.PropertyType.IsPublicType))
            or ((fSerializeLevel = slPublishedProperty) and ((IsPublishedProp(aObject,rProp.Name)) or (rProp.Name = 'List'))) then
        {$ENDIF}
        begin
          if ((rProp.IsWritable) or (rProp.Name = 'List')) and (IsAllowedProperty(aObject,rProp.Name)) then
          begin
            propertyname := rProp.Name;
            {$IFNDEF FPC}
            for attr in rProp.GetAttributes do if attr is TCustomNameProperty then propertyname := TCustomNameProperty(attr).Name;
            if rProp.Name = 'List' then
            begin
              Result := DeserializeList(Result,propertyname,aJson);
            end
            else
            {$ENDIF}
            Result := DeserializeProperty(Result,propertyname,rProp,aJson);
          end;
        end;
      end;
    finally
      ctx.Free;
    end;
  except
    on E : Exception do
    begin
      Result.Free;
      raise EJsonDeserializeError.CreateFmt('Deserialize error for object "%s" : %s',[aObject.ClassName,e.Message]);
    end;
  end;
end;

{$IFNDEF FPC}
function TRTTIJson.DeserializeList(aObject: TObject; const aName : string; const aJson: TJSONObject) : TObject;
var
  ctx : TRttiContext;
  rType : TRttiType;
  jarray : TJSONArray;
  member : TJSONPair;
  rvalue : TValue;
  i : Integer;
  rProp : TRttiProperty;
begin
  Result := aObject;
  member := TJSONPair(aJson.GetValue(aName));

  rType := ctx.GetType(aObject.ClassInfo);
  try
    rProp := rType.GetProperty('List');
    if rProp = nil then Exit;
  finally
    ctx.Free;
  end;

  jArray := TJSONObject.ParseJSONValue(member.ToJSON) as TJSONArray;
  try
    rvalue := DeserializeDynArray(rProp.PropertyType.Handle,Result,jArray);
    //i := jarray.Count;
  finally
    jArray.Free;
  end;

  if not rValue.IsEmpty then
  begin
    {$IFDEF DELPHIRX103_UP}
    if (TObjectList<TObject>(aObject) <> nil) and (rvalue.IsArray) then
    begin
      for i := 0 to rvalue.GetArrayLength - 1 do
      begin
        TObjectList<TObject>(aObject).Add(rvalue.GetArrayElement(i).AsObject);
      end;
    end;
    {$ELSE}
    for rfield in rType.GetFields do
    begin
      if rfield.Name = 'FOwnsObjects' then rfield.SetValue(aObject,True);
      //if rfield.Name = 'FCount' then rfield.SetValue(aObject,i);
      if rfield.Name = 'FItems' then
      begin
        //if TList(aObject) <> nil then TList(aObject).Clear;
        //rfield.GetValue(aObject).AsObject.Free;// aValue.GetReferenceToRawData)
        rfield.SetValue(aObject,rValue);// .SetDynArrayProp(aObject,'fItems',Result);
        Break;
      end;
    end;
    rProp := rType.GetProperty('Count');
    rProp.SetValue(aObject,i);
    {$ENDIF}
  end;
end;
{$ENDIF}

function TRTTIJson.DeserializeProperty(aObject : TObject; const aName : string; aProperty : TRttiProperty; const aJson : TJSONObject) : TObject;
var
  rValue : TValue;
  {$IFNDEF FPC}
  member : TJSONPair;
  {$ELSE}
  member : TJsonObject;
  {$ENDIF}
  objClass: TClass;
  jArray : TJSONArray;
  json : TJSONObject;
begin
    Result := aObject;
    rValue := nil;
    {$IFNDEF FPC}
     member := TJSONPair(aJson.GetValue(aName));
    {$ELSE}
    member := TJsonObject(aJson.Find(aName));
    {$ENDIF}
    if member <> nil then
    begin
      case aProperty.PropertyType.TypeKind of
        tkDynArray :
          begin
            {$IFNDEF FPC}
            jArray := TJSONObject.ParseJSONValue(member.ToJSON) as TJSONArray;
            {$ELSE}
            jArray := TJSONArray(TJSONObject.ParseJSONValue(member.ToJSON));
            {$ENDIF}
            try
              {$IFNDEF FPC}
              aProperty.SetValue(aObject,DeserializeDynArray(aProperty.PropertyType.Handle,Result,jArray));
              {$ELSE}
              DeserializeDynArray(aProperty.PropertyType.Handle,aName,Result,jArray);
              {$ENDIF}
              Exit;
            finally
              jArray.Free;
            end;
          end;
        tkClass :
          begin
            //if (member.JsonValue is TJSONObject) then
            begin
              json := TJsonObject(TJSONObject.ParseJSONValue(member.ToJson));
              try
                if aProperty.GetValue(aObject).AsObject = nil then
                begin
                  {$IFNDEF FPC}
                  objClass := aProperty.PropertyType.Handle^.TypeData.ClassType;
                  rValue := DeserializeClass(objClass,json);
                  {$ELSE}
                  objClass := GetObjectPropClass(aObject,aName);
                  //objClass := GetTypeData(aProperty.PropertyType.Handle)^.ClassType;
                  rValue := DeserializeClass(objClass,json);
                  SetObjectProp(aObject,aName,rValue.AsObject);
                  Exit;
                  {$ENDIF}
                end
                else
                begin
                  rValue := DeserializeObject(aProperty.GetValue(aObject).AsObject,json);
                  Exit;
                end;
              finally
                json.Free;
              end;
            end
          end;
        {$IFNDEF FPC}
        tkRecord :
          begin
            json := TJSONObject.ParseJSONValue(member.ToJson) as TJSONObject;
            try
              rValue := DeserializeRecord(aProperty.GetValue(aObject),aObject,json);
            finally
              json.Free;
            end;
          end;
        {$ENDIF}
      else
        begin
          {$IFNDEF FPC}
          //avoid return unicode escaped chars if string
          if aProperty.PropertyType.TypeKind in [tkString, tkLString, tkWString, tkUString] then
            {$IFDEF DELPHIRX103_UP}
            rValue := DeserializeType(aObject,aProperty.PropertyType.TypeKind,aProperty.GetValue(aObject).TypeInfo,TJsonValue(member).value)
            {$ELSE}
            rValue := DeserializeType(aObject,aProperty.PropertyType.TypeKind,aProperty.GetValue(aObject).TypeInfo,member.JsonString.ToString)
            {$ENDIF}
            else rValue := DeserializeType(aObject,aProperty.PropertyType.TypeKind,aProperty.GetValue(aObject).TypeInfo,member.ToJSON);
          {$ELSE}
          rValue := DeserializeType(aObject,aProperty.PropertyType.TypeKind,aName,member.ToJSON);
          if not rValue.IsEmpty then SetPropertyValue(aObject,aName,rValue);
          {$ENDIF}
        end;
      end;
      {$IFNDEF FPC}
      if not rValue.IsEmpty then aProperty.SetValue(Result,rValue);
      {$ENDIF}
    end;
end;

{$IFNDEF FPC}
function TRTTIJson.DeserializeType(aObject : TObject; aType : TTypeKind; aTypeInfo : PTypeInfo; const aValue: string) : TValue;
var
  i : Integer;
  value : string;
  fsettings : TFormatSettings;
begin
  try
    value := AnsiDequotedStr(aValue,'"');
    case aType of
      tkString, tkLString, tkWString, tkUString :
        begin
          Result := value;
        end;
      tkChar, tkWChar :
        begin
          Result := value;
        end;
      tkInteger :
        begin
          Result := StrToInt(value);
        end;
      tkInt64 :
        begin
          Result := StrToInt64(value);
        end;
      tkFloat :
        begin
          if aTypeInfo = TypeInfo(TDateTime) then
          begin
            Result := JsonDateToDateTime(value);
          end
          else if aTypeInfo = TypeInfo(TDate) then
          begin
            Result := StrToDate(value);
          end
          else if aTypeInfo = TypeInfo(TTime) then
          begin
            Result := StrToTime(value);
          end
          else
          begin
            fsettings := TFormatSettings.Create;
            Result := StrToFloat(StringReplace(value,'.',fsettings.DecimalSeparator,[]));
          end;
        end;
      tkEnumeration :
        begin
          if aTypeInfo = System.TypeInfo(Boolean) then
          begin
            Result := StrToBool(value);
          end
          else
          begin
            if fUseEnumNames then TValue.Make(GetEnumValue(aTypeInfo,value),aTypeInfo, Result)
              else TValue.Make(StrToInt(value),aTypeInfo, Result);
          end;
        end;
      tkSet :
        begin
          i := StringToSet(aTypeInfo,value);
          TValue.Make(@i,aTypeInfo,Result);
        end;
    else
        begin
          //raise EclJsonSerializerError.Create('Not supported data type!');
        end;
    end;
  except
    on E : Exception do
    begin
      raise EJsonDeserializeError.CreateFmt('Deserialize error type "%s.%s" : %s',[aObject.ClassName,GetTypeName(aTypeInfo),e.Message]);
    end;
  end;
end;
{$ELSE}
function TRTTIJson.DeserializeType(aObject : TObject; aType : TTypeKind; const aPropertyName, aValue: string) : TValue;
var
  value : string;
  propinfo : PPropInfo;
  fsettings : TFormatSettings;
begin
  try
    value := AnsiDequotedStr(aValue,'"');

    if value = '' then
    begin
      Result := nil;
      Exit;
    end;
    propinfo := GetPropInfo(aObject,aPropertyName);
    //case propinfo.PropType.Kind of
    case aType of
      tkString, tkLString, tkWString, tkUString, tkAString :
        begin
          Result := value;
          //SetStrProp(aObject,propinfo,value);
        end;
      tkChar, tkWChar :
        begin
          Result := value;
        end;
      tkInteger :
        begin
          Result := StrToInt(value);
        end;
      tkInt64 :
        begin
          Result := StrToInt64(value);
        end;
      tkFloat :
        begin
          if propinfo.PropType = TypeInfo(TDateTime) then
          begin
            Result := JsonDateToDateTime(value);
          end
          else if propinfo.PropType = TypeInfo(TDate) then
          begin
            Result := StrToDate(value);
          end
          else if propinfo.PropType = TypeInfo(TTime) then
          begin
            Result := StrToTime(value);
          end
          else
          begin
            fsettings := DefaultFormatSettings;
            Result := StrToFloat(StringReplace(value,'.',fsettings.DecimalSeparator,[]));
          end;
        end;
      tkEnumeration:
        begin
          Result := value;
        end;
      tkBool :
          begin
            Result := StrToBool(value);
          end;
      tkSet :
        begin
          Result := value;
        end;
    else
        begin
          //raise EclJsonSerializerError.Create('Not supported data type!');
        end;
    end;
    //if not Result.IsEmpty then SetPropertyValue(aObject,propinfo,Result);
  except
    on E : Exception do
    begin
      raise EJsonDeserializeError.CreateFmt('Deserialize error type "%s" : %s',[aObject.ClassName,e.Message]);
    end;
  end;
end;
{$ENDIF}

function TRTTIJson.IsAllowedProperty(aObject : TObject; const aPropertyName : string) : Boolean;
var
  propname : string;
begin
  Result := True;
  propname := aPropertyName.ToLower;
  if IsGenericList(aObject) then
  begin
    if (propname = 'capacity') or (propname = 'count') or (propname = 'ownsobjects') then Result := False;
  end
  else if (propname = 'refcount') then Result := False;
end;

function TRTTIJson.IsGenericList(aObject : TObject) : Boolean;
var
  cname : string;
begin
  cname := aObject.ClassName;
  Result := (cname.StartsWith('TObjectList')) or (cname.StartsWith('TList'));
end;

function TRTTIJson.GetPropertyValue(Instance : TObject; const PropertyName : string) : TValue;
var
  pinfo : PPropInfo;
begin
  Result := nil;
  pinfo := GetPropInfo(Instance,PropertyName);
  case pinfo.PropType^.Kind of
    tkInteger : Result := GetOrdProp(Instance,pinfo);
    tkInt64 : Result := GetInt64Prop(Instance,PropertyName);
    tkFloat : Result := GetFloatProp(Instance,PropertyName);
    tkChar : Result := Char(GetOrdProp(Instance,PropertyName));
    {$IFDEF FPC}
    tkWString : Result := GetWideStrProp(Instance,PropertyName);
    tkSString,
    tkAString,
    {$ELSE}
    tkWString,
    {$ENDIF}
    tkLString : Result := GetStrProp(Instance,pinfo);
    {$IFDEF FPC}
    tkEnumeration :
      begin
        if fUseEnumNames then Result := GetEnumName(pinfo.PropType,GetOrdProp(Instance,PropertyName))
          else Result := GetOrdProp(Instance,PropertyName);
      end;
    {$ELSE}
    tkEnumeration :
      begin
        if fUseEnumNames then Result := GetEnumName(@pinfo.PropType,GetOrdProp(Instance,PropertyName))
          else Result := GetOrdProp(Instance,PropertyName);
      end;
    {$ENDIF}
    tkSet : Result := GetSetProp(Instance,pinfo,True);
    {$IFNDEF FPC}
    tkClass :
    {$ELSE}
    tkBool : Result := Boolean(GetOrdProp(Instance,pinfo));
    tkObject :
    {$ENDIF} Result := GetObjectProp(Instance,pinfo);
    tkDynArray : Result := GetDynArrayProp(Instance,pinfo);
  end;
end;

procedure TRTTIJson.SetPropertyValue(Instance : TObject; const PropertyName : string; aValue : TValue);
var
  pinfo : PPropInfo;
begin
  pinfo := GetPropInfo(Instance,PropertyName);
  SetPropertyValue(Instance,pinfo,aValue);
end;

procedure TRTTIJson.SetPropertyValue(Instance : TObject; aPropInfo : PPropInfo; aValue : TValue);
begin
  case aPropInfo.PropType^.Kind of
    tkInteger : SetOrdProp(Instance,aPropInfo,aValue.AsInteger);
    tkInt64 : SetInt64Prop(Instance,aPropInfo,aValue.AsInt64);
    tkFloat : SetFloatProp(Instance,aPropInfo,aValue.AsExtended);
    tkChar : SetOrdProp(Instance,aPropInfo,aValue.AsOrdinal);
    {$IFDEF FPC}
    tkWString : SetWideStrProp(Instance,aPropInfo,aValue.AsString);
    tkSString,
    tkAString,
    {$ELSE}
    tkWString,
    {$ENDIF}
    tkLString : SetStrProp(Instance,aPropInfo,aValue.AsString);
    {$IFDEF FPC}
    tkBool : SetOrdProp(Instance,aPropInfo,aValue.AsOrdinal);
    tkSet : LoadSetProperty(Instance,aPropInfo,aValue.AsString);
    {$ENDIF}
    tkEnumeration : SetEnumProp(Instance,aPropInfo,aValue.AsString);
    {$IFNDEF FPC}
    tkClass :
    {$ELSE}
    tkObject :
    {$ENDIF} SetObjectProp(Instance,aPropInfo,aValue.AsObject);
  end;
end;

{$IFDEF FPC}
procedure TRTTIJson.LoadSetProperty(aInstance : TObject; aPropInfo: PPropInfo; const aValue: string);
type
  TCardinalSet = set of 0..SizeOf(Cardinal) * 8 - 1;
const
  Delims = [' ', ',', '[', ']'];
var
  TypeInfo: PTypeInfo;
  W: Cardinal;
  I, N: Integer;
  Count: Integer;
  EnumName: string;
begin
  W := 0;
  TypeInfo := GetTypeData(GetPropType(aPropInfo))^.CompType;
  Count := WordCount(aValue, Delims);
  for N := 1 to Count do
  begin
    EnumName := ExtractWord(N, aValue, Delims);
    try
      I := GetEnumValue(TypeInfo, EnumName);
      if I >= 0 then Include(TCardinalSet(W),I);
    except
    end;
  end;
  SetOrdProp(aInstance,aPropInfo,W);
end;
{$ENDIF}

function TRTTIJson.Serialize(aObject: TObject): TJSONObject;
var
  ctx: TRttiContext;
  {$IFNDEF FPC}
  attr : TCustomAttribute;
  comment : string;
  {$ENDIF}
  rType: TRttiType;
  rProp: TRttiProperty;
  jpair : TJSONPair;
  ExcludeSerialize : Boolean;
  propertyname : string;

  //listtype : TRttiType;
  //listprop : TRttiProperty;
  //listvalue : TValue;
begin
  if (aObject = nil) then
  begin
    Result := nil;
    Exit;
  end;

  Result := TJSONObject.Create;
  try
    rType := ctx.GetType(aObject.ClassInfo);
    try
      //s := rType.ToString;
      for rProp in rType.GetProperties do
      begin
        ExcludeSerialize := False;
        propertyname := rProp.Name;
        {$IFNDEF FPC}
        comment := '';
        for attr in rProp.GetAttributes do
        begin
          if attr is TNotSerializableProperty then ExcludeSerialize := True
          else if attr is TCommentProperty then comment := TCommentProperty(attr).Comment
          else if  attr is TCustomNameProperty then propertyname := TCustomNameProperty(attr).Name;
        end;
        if ((fSerializeLevel = slPublicProperty) and (rProp.PropertyType.IsPublicType))
            or ((fSerializeLevel = slPublishedProperty) and ((IsPublishedProp(aObject,rProp.Name)) or (rProp.Name = 'List'))) then
        {$ENDIF}
        begin
          if (IsAllowedProperty(aObject,propertyname)) and (not ExcludeSerialize) then
          begin
            //add comment as pair
            {$IFNDEF FPC}
            if comment <> '' then Result.AddPair(TJSONPair.Create('#Comment#->'+propertyname,Comment));
            {$ENDIF}
            //listtype := ctx.GetType(rProp.GetValue(aObject).TypeInfo);
            //if (listtype.ClassParent.ClassName.StartsWith('TObjectList')) then
            //begin
            //  jpair := Serialize(propertyname,rProp.GetValue(aObject));
            //  Result.AddPair(propertyname,(jpair.JsonValue as TJSONObject).GetValue('List').Clone as TJsonValue);
            //  jpair.Free;
              //listtype := ctx.GetType(rProp.GetValue(aObject).AsObject.ClassInfo);
              //listprop := listtype.GetProperty('List');
              //listvalue := listprop.GetValue(aObject);
              //jpair := Serialize('Groups',listvalue);
              //if jpair <> nil then Result.AddPair(jpair)
              // else jpair.Free;
              //Exit;
            //end
            //else
            begin
              {$IFNDEF FPC}
              jpair := Serialize(propertyname,rProp.GetValue(aObject));
              {$ELSE}
              jpair := Serialize(aObject,rProp.PropertyType.TypeKind,propertyname);
              {$ENDIF}
              //s := jpair.JsonValue.ToString;
              if jpair <> nil then
              begin
                Result.AddPair(jpair);
              end
              else jpair.Free;
            end;
            //Result.AddPair(Serialize(rProp.Name,rProp.GetValue(aObject)));
            //s := Result.ToJSON;
          end;
        end;
      end;
    finally
      ctx.Free;
    end;
  except
    on E : Exception do
    begin
      Result.Free;
      raise EJsonSerializeError.CreateFmt('Serialize error object "%s" : %s',[aObject.ClassName,e.Message]);
    end;
  end;
end;

function TRTTIJson.GetValue(aAddr: Pointer; aType: TRTTIType): TValue;
begin
  TValue.Make(aAddr,aType.Handle,Result);
end;

function TRTTIJson.GetValue(aAddr: Pointer; aTypeInfo: PTypeInfo): TValue;
begin
  TValue.Make(aAddr,aTypeInfo,Result);
end;

{$IFNDEF FPC}
function TRTTIJson.Serialize(const aName : string; aValue : TValue) : TJSONPair;
var
  ctx: TRttiContext;
  rRec : TRttiRecordType;
  rField : TRttiField;
  rDynArray : TRTTIDynamicArrayType;
  json : TJSONObject;
  jArray : TJSONArray;
  jPair : TJSONPair;
  jValue : TJSONValue;
  i : Integer;
begin
  Result := TJSONPair.Create(aName,nil);
  //Result.JsonString := TJSONString(aName);
  try
    case avalue.Kind of
      tkDynArray :
        begin
          jArray := TJSONArray.Create;
          rDynArray := ctx.GetType(aValue.TypeInfo) as TRTTIDynamicArrayType;
          try
            for i := 0 to aValue.GetArrayLength - 1 do
            begin
              jValue := nil;
              jPair := Serialize(aName,GetValue(PPByte(aValue.GetReferenceToRawData)^ + rDynArray.ElementType.TypeSize * i, rDynArray.ElementType));
              try
                //jValue := TJsonValue(jPair.JsonValue.Clone);
                jValue := jPair.JsonValue;
                if jValue <> nil then
                begin
                  jArray.AddElement(jValue);
                  jPair.JsonValue.Owned := False;
                end;
              finally
                jPair.Free;
                if jValue <> nil then jValue.Owned := True;
              end;
            end;
            Result.JsonValue := jArray;
          finally
            ctx.Free;
          end;
        end;
      tkClass :
        begin
           Result.JsonValue := TJSONValue(Serialize(aValue.AsObject));
        end;
      tkString, tkLString, tkWString, tkUString :
        begin
          Result.JsonValue := TJSONString.Create(aValue.AsString);
        end;
      tkChar, tkWChar :
        begin
          Result.JsonValue := TJSONString.Create(aValue.AsString);
        end;
      tkInteger :
        begin
          Result.JsonValue := TJSONNumber.Create(aValue.AsInteger);
        end;
      tkInt64 :
        begin
          Result.JsonValue := TJSONNumber.Create(aValue.AsInt64);
        end;
      tkFloat :
        begin
          if aValue.TypeInfo = TypeInfo(TDateTime) then
          begin
            Result.JsonValue := TJSONString.Create(DateTimeToJsonDate(aValue.AsExtended));
          end
          else if aValue.TypeInfo = TypeInfo(TDate) then
          begin
            Result.JsonValue := TJSONString.Create(DateToStr(aValue.AsExtended));
          end
          else if aValue.TypeInfo = TypeInfo(TTime) then
          begin
            Result.JsonValue := TJSONString.Create(TimeToStr(aValue.AsExtended));
          end
          else
          begin
            Result.JsonValue := TJSONNumber.Create(aValue.AsExtended);
          end;
        end;
      tkEnumeration :
        begin
          if (aValue.TypeInfo = System.TypeInfo(Boolean)) then
          begin
            Result.JsonValue := TJSONBool.Create(aValue.AsBoolean);
          end
          else
          begin
            //Result.JsonValue := TJSONString.Create(GetEnumName(aValue.TypeInfo,aValue.AsOrdinal));
            if fUseEnumNames then Result.JsonValue := TJSONString.Create(aValue.ToString)
              else Result.JsonValue := TJSONNumber.Create(GetEnumValue(aValue.TypeInfo,aValue.ToString));
          end;
        end;
      tkSet :
        begin
          Result.JsonValue := TJSONString.Create(aValue.ToString);
        end;
      tkRecord :
        begin
          rRec := ctx.GetType(aValue.TypeInfo).AsRecord;
          try
            json := TJSONObject.Create;
            for rField in rRec.GetFields do
            begin
              json.AddPair(Serialize(rField.name,rField.GetValue(aValue.GetReferenceToRawData)));
            end;
            Result.JsonValue := json;
          finally
            ctx.Free;
          end;
        end;
      tkMethod, tkPointer, tkClassRef ,tkInterface, tkProcedure :
        begin
          //skip these properties
          FreeAndNil(Result);
        end
    else
      begin
        raise EJsonSerializeError.CreateFmt(cNotSupportedDataType,[aName,GetTypeName(aValue.TypeInfo)]);
      end;
    end;
  except
    on E : Exception do
    begin
      Result.Free;
      raise EJsonSerializeError.CreateFmt('Serialize error class "%s.%s" : %s',[aName,aValue.ToString,e.Message]);
    end;
  end;
end;
{$ELSE}
function TRTTIJson.GetPropType(aPropInfo: PPropInfo): PTypeInfo;
begin
  Result := aPropInfo^.PropType;
end;

function TRTTIJson.FloatProperty(aObject : TObject; aPropInfo: PPropInfo): string;
const
  Precisions: array[TFloatType] of Integer = (7, 15, 18, 18, 19);
var
  fsettings : TFormatSettings;
begin
  fsettings := FormatSettings;
  Result := StringReplace(FloatToStrF(GetFloatProp(aObject, aPropInfo), ffGeneral,
    Precisions[GetTypeData(GetPropType(aPropInfo))^.FloatType],0),
    '.',fsettings.DecimalSeparator,[rfReplaceAll]);
end;

function TRTTIJson.Serialize(const aName : string; aValue : TValue) : TJSONPair;
begin
  Result := TJSONPair.Create(aName,nil);
  //Result.JsonString := TJSONString(aName);
  try
    case avalue.Kind of
      tkClass :
        begin
           Result.JsonValue := TJSONValue(Serialize(aValue.AsObject));
        end;
      tkString, tkLString, tkWString, tkUString :
        begin
          Result.JsonValue := TJSONString.Create(aValue.AsString);
        end;
      tkChar, tkWChar :
        begin
          Result.JsonValue := TJSONString.Create(aValue.AsString);
        end;
      tkInteger :
        begin
          Result.JsonValue := TJSONNumber.Create(aValue.AsInteger);
        end;
      tkInt64 :
        begin
          Result.JsonValue := TJSONNumber.Create(aValue.AsInt64);
        end;
      tkFloat :
        begin
          if aValue.TypeInfo = TypeInfo(TDateTime) then
          begin
            Result.JsonValue := TJSONString.Create(DateTimeToJsonDate(aValue.AsExtended));
          end
          else if aValue.TypeInfo = TypeInfo(TDate) then
          begin
            Result.JsonValue := TJSONString.Create(DateToStr(aValue.AsExtended));
          end
          else if aValue.TypeInfo = TypeInfo(TTime) then
          begin
            Result.JsonValue := TJSONString.Create(TimeToStr(aValue.AsExtended));
          end
          else
          begin
            Result.JsonValue := TJSONNumber.Create(aValue.AsExtended);
          end;
        end;
      tkEnumeration :
        begin
          if (aValue.TypeInfo = System.TypeInfo(Boolean)) then
          begin
            Result.JsonValue := TJSONBool.Create(aValue.AsBoolean);
          end
          else
          begin
            //Result.JsonValue := TJSONString.Create(GetEnumName(aValue.TypeInfo,aValue.AsOrdinal));
            if fUseEnumNames then Result.JsonValue := TJSONString.Create(aValue.ToString)
              else Result.JsonValue := TJSONNumber.Create(GetEnumValue(aValue.TypeInfo,aValue.ToString));
          end;
        end;
      tkSet :
        begin
          Result.JsonValue := TJSONString.Create(aValue.ToString);
        end;
    else
      begin
        //raise EJsonDeserializeError.CreateFmt('Not supported type "%s":%d',[aName,Integer(aValue.Kind)]);
      end;
    end;
  except
    Result.Free;
  end;
end;

function TRTTIJson.Serialize(aObject : TObject; aType : TTypeKind; const aPropertyName : string) : TJSONPair;
var
  propinfo : PPropInfo;
  jArray : TJsonArray;
  jPair : TJsonPair;
  jValue : TJsonValue;
  i : Integer;
  pArr : Pointer;
  rValue : TValue;
  rItemValue : TValue;
  len : Integer;
begin
  try
    Result := TJSONPair.Create(aPropertyName,nil);

    propinfo := GetPropInfo(aObject,aPropertyName);
    //case propinfo.PropType.Kind of
    case aType of
      tkDynArray :
        begin
          len := 0;
          jArray := TJSONArray.Create;
          try
            pArr := GetDynArrayProp(aObject,aPropertyName);
            TValue.Make(@pArr,propinfo.PropType, rValue);
            if rValue.IsArray then
            begin
              len := rValue.GetArrayLength;
              for i := 0 to len - 1 do
              begin
                rItemValue := rValue.GetArrayElement(i);
                jPair := Serialize(aPropertyName,rItemValue);
                try
                  //jValue := TJsonValue(jPair.JsonValue.Clone);
                  jValue := jPair.JsonValue;
                  jArray.Add(jValue);
                  //jPair.JsonValue.Owned := False;
                finally
                  jPair.Free;
                  //jValue.Owned := True;
                end;
              end;
            end;
            Result.JsonValue := jArray;
          finally
            //DynArrayClear(pArr,propinfo.PropType);
            pArr := nil;
          end;
        end;
      tkClass :
        begin
          Result.JsonValue := TJSONValue(Serialize(GetObjectProp(aObject,aPropertyName)));
        end;
      tkString, tkLString, tkWString, tkUString, tkAString :
        begin
          Result.JsonValue := TJSONString.Create(GetStrProp(aObject,aPropertyName));
        end;
      tkChar, tkWChar :
        begin
          Result.JsonValue := TJSONString.Create(Char(GetOrdProp(aObject,aPropertyName)));
        end;
      tkInteger :
        begin
          Result.JsonValue := TJSONNumber.Create(GetOrdProp(aObject,aPropertyName));
        end;
      tkInt64 :
        begin
          Result.JsonValue := TJSONNumber.Create(GetOrdProp(aObject,aPropertyName));
        end;
      tkFloat :
        begin
          if propinfo.PropType = TypeInfo(TDateTime) then
          begin
            Result.JsonValue := TJSONString.Create(DateTimeToJsonDate(GetFloatProp(aObject,aPropertyName)));
          end
          else if propinfo.PropType = TypeInfo(TDate) then
          begin
            Result.JsonValue := TJSONString.Create(DateToStr(GetFloatProp(aObject,aPropertyName)));
          end
          else if propinfo.PropType = TypeInfo(TTime) then
          begin
            Result.JsonValue := TJSONString.Create(TimeToStr(GetFloatProp(aObject,aPropertyName)));
          end
          else
          begin
            //Result.JsonValue := TJsonFloatNumber.Create(GetFloatProp(aObject,aPropertyName));
            Result.JsonValue := TJsonFloatNumber.Create(StrToFloat(FloatProperty(aObject,propinfo)));
          end;
        end;
      tkEnumeration,tkBool :
        begin
          if (propinfo.PropType = System.TypeInfo(Boolean)) then
          begin
            Result.JsonValue := TJSONBool.Create(Boolean(GetOrdProp(aObject,aPropertyName)));
          end
          else
          begin
            if fUseEnumNames then Result.JsonValue := TJSONString.Create(GetEnumName(propinfo.PropType,GetOrdProp(aObject,aPropertyName)))
              else Result.JsonValue := TJSONNumber.Create(GetOrdProp(aObject,aPropertyName));
            //Result.JsonValue := TJSONString.Create(aValue.ToString);
          end;
        end;
      tkSet :
        begin
          Result.JsonValue := TJSONString.Create(GetSetProp(aObject,aPropertyName));
        end;
      {$IFNDEF FPC}
      tkRecord :
        begin
          rRec := ctx.GetType(aValue.TypeInfo).AsRecord;
          try
            json := TJSONObject.Create;
            for rField in rRec.GetFields do
            begin
              json.AddPair(Serialize(rField.name,rField.GetValue(aValue.GetReferenceToRawData)));
            end;
            Result.JsonValue := json;
          finally
            ctx.Free;
          end;
        end;
      {$ENDIF}
      tkMethod, tkPointer, tkClassRef ,tkInterface, tkProcedure :
        begin
          //skip these properties
          FreeAndNil(Result);
        end
    else
      begin

        //raise EJsonDeserializeError.CreateFmt('Not supported type "%s":%d',[aName,Integer(aValue.Kind)]);
      end;
    end;
  except
    on E : Exception do
    begin
      Result.Free;
      {$IFNDEF FPC}
      raise EJsonSerializeError.CreateFmt('Serialize error class "%s.%s" : %s',[aName,aValue.ToString,e.Message]);
      {$ENDIF}
    end;
  end;
end;
{$ENDIF}


{ TJsonSerializer}

constructor TJsonSerializer.Create(aSerializeLevel: TSerializeLevel);
begin
  {$IFDEF FPC}
  if aSerializeLevel = TSerializeLevel.slPublicProperty then raise EJsonSerializeError.Create('FreePascal RTTI only supports published properties');
  {$ENDIF}
  fSerializeLevel := aSerializeLevel;
  fUseEnumNames := True;
  fRTTIJson := TRTTIJson.Create(aSerializeLevel);
  fRTTIJson.UseEnumNames := fUseEnumNames;
end;

function TJsonSerializer.JsonToObject(aType: TClass; const aJson: string): TObject;
var
  json: TJSONObject;
begin
  json := TJSONObject.ParseJSONValue(aJson,True) as TJSONObject;
  try
    Result := fRTTIJson.DeserializeClass(aType,json);
  finally
    json.Free;
  end;
end;

destructor TJsonSerializer.Destroy;
begin
  fRTTIJson.Free;
  inherited;
end;

function TJsonSerializer.JsonToObject(aObject: TObject; const aJson: string): TObject;
var
  json: TJSONObject;
begin
  json := TJsonObject(TJSONObject.ParseJSONValue(aJson,True));
  try
    Result := fRTTIJson.DeserializeObject(aObject,json);
  finally
    json.Free;
  end;
end;

function TJsonSerializer.ObjectToJson(aObject : TObject; aIndent : Boolean = False): string;
var
  json: TJSONObject;
begin
  json := fRTTIJson.Serialize(aObject);
  try
    Result := json.ToJSON;
    if aIndent then Result := TJsonUtils.JsonFormat(Result);
  finally
    json.Free;
  end;
end;

procedure TJsonSerializer.SetUseEnumNames(const Value: Boolean);
begin
  fUseEnumNames := Value;
  if Assigned(fRTTIJson) then fRTTIJson.UseEnumNames := Value;
end;

{$IFNDEF FPC}
{ TCommentProperty }

constructor TCommentProperty.Create(const aComment: string);
begin
  fComment := aComment;
end;

{ TCustomNameProperty }

constructor TCustomNameProperty.Create(const aName: string);
begin
  fName := aName;
end;
{$ENDIF}


end.