System.Rtti.Helper.pas

{***************************************************************************}
{                                                                           }
{           Delphi.Mocks                                                    }
{                                                                           }
{           Copyright (C) 2011 Vincent Parrett                              }
{                                                                           }
{           http://www.finalbuilder.com                                     }
{                                                                           }
{                                                                           }
{***************************************************************************}
{                                                                           }
{  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                                  }
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{      http://www.apache.org/licenses/LICENSE-2.0                           }
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{  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.                                           }
{                                                                           }
{***************************************************************************}

(*
  Original: https://github.com/VSoftTechnologies/Delphi-Mocks/blob/master
  SameValue/CompareValue Copyright (c) 2011, Stefan Glienke
  Used with permission.
*)

unit System.Rtti.Helper;

interface

uses
  Rtti;

type
  //TValue really needs to have an Equals operator overload!
  TValueHelper = record helper for TValue
    function Equals(const value : TValue) : boolean;
    function IsFloat: Boolean;
    function IsNumeric: Boolean;
    function IsPointer: Boolean;
    function IsString: Boolean;
    function IsBoolean: Boolean;
    function IsByte: Boolean;
    function IsCardinal: Boolean;
    function IsCurrency: Boolean;
    function IsDate: Boolean;
    function IsDateTime: Boolean;
    function IsDouble: Boolean;
    function IsInteger: Boolean;
    function IsInt64: Boolean;
    function IsShortInt: Boolean;
    function IsSingle: Boolean;
    function IsSmallInt: Boolean;
    function IsTime: Boolean;
    function IsUInt64: Boolean;
    function IsVariant: Boolean;
    function IsWord: Boolean;
	function IsGuid: Boolean;
    function AsDouble: Double;
    function AsFloat: Extended;
    function AsSingle: Single;
    function AsPointer: Pointer;
  end;


  TRttiTypeHelper = class helper for TRttiType
    function TryGetMethod(const AName: string; out AMethod: TRttiMethod): Boolean;
    function FindConstructor : TRttiMethod;
  end;

function CompareValue(const Left, Right: TValue): Integer;
function SameValue(const Left, Right: TValue): Boolean;


implementation

uses
  SysUtils,
  Math,
  TypInfo;

function CompareValue(const Left, Right: TValue): Integer;
begin
  if Left.IsOrdinal and Right.IsOrdinal then
  begin
    Result := Math.CompareValue(Left.AsOrdinal, Right.AsOrdinal);
  end else
  if Left.IsFloat and Right.IsFloat then
  begin
    Result := Math.CompareValue(Left.AsFloat, Right.AsFloat);
  end else
  if Left.IsString and Right.IsString then
  begin
    Result := SysUtils.CompareStr(Left.AsString, Right.AsString);
  end else
  begin
    Result := 0;
  end;
end;

function SameValue(const Left, Right: TValue): Boolean;
begin
  if Left.IsNumeric and Right.IsNumeric then
  begin
    if Left.IsOrdinal then
    begin
      if Right.IsOrdinal then
      begin
        Result := Left.AsOrdinal = Right.AsOrdinal;
      end else
      if Right.IsSingle then
      begin
        Result := Math.SameValue(Left.AsOrdinal, Right.AsSingle);
      end else
      if Right.IsDouble then
      begin
        Result := Math.SameValue(Left.AsOrdinal, Right.AsDouble);
      end
      else
      begin
        Result := Math.SameValue(Left.AsOrdinal, Right.AsExtended);
      end;
    end else
    if Left.IsSingle then
    begin
      if Right.IsOrdinal then
      begin
        Result := Math.SameValue(Left.AsSingle, Right.AsOrdinal);
      end else
      if Right.IsSingle then
      begin
        Result := Math.SameValue(Left.AsSingle, Right.AsSingle);
      end else
      if Right.IsDouble then
      begin
        Result := Math.SameValue(Left.AsSingle, Right.AsDouble);
      end
      else
      begin
        Result := Math.SameValue(Left.AsSingle, Right.AsExtended);
      end;
    end else
    if Left.IsDouble then
    begin
      if Right.IsOrdinal then
      begin
        Result := Math.SameValue(Left.AsDouble, Right.AsOrdinal);
      end else
      if Right.IsSingle then
      begin
        Result := Math.SameValue(Left.AsDouble, Right.AsSingle);
      end else
      if Right.IsDouble then
      begin
        Result := Math.SameValue(Left.AsDouble, Right.AsDouble);
      end
      else
      begin
        Result := Math.SameValue(Left.AsDouble, Right.AsExtended);
      end;
    end
    else
    begin
      if Right.IsOrdinal then
      begin
        Result := Math.SameValue(Left.AsExtended, Right.AsOrdinal);
      end else
      if Right.IsSingle then
      begin
        Result := Math.SameValue(Left.AsExtended, Right.AsSingle);
      end else
      if Right.IsDouble then
      begin
        Result := Math.SameValue(Left.AsExtended, Right.AsDouble);
      end
      else
      begin
        Result := Math.SameValue(Left.AsExtended, Right.AsExtended);
      end;
    end;
  end else
  if Left.IsString and Right.IsString then
  begin
    Result := Left.AsString = Right.AsString;
  end else
  if Left.IsClass and Right.IsClass then
  begin
    Result := Left.AsClass = Right.AsClass;
  end else
  if Left.IsObject and Right.IsObject then
  begin
    Result := Left.AsObject = Right.AsObject;
  end else
  if Left.IsPointer and Right.IsPointer then
  begin
    Result := Left.AsPointer = Right.AsPointer;
  end else
  if Left.IsVariant and Right.IsVariant then
  begin
    Result := Left.AsVariant = Right.AsVariant;
  end else
  if Left.IsGuid and Right.IsGuid then
  begin
    Result := IsEqualGuid( Left.AsType<TGUID>, Right.AsType<TGUID> );
  end else
  if Left.TypeInfo = Right.TypeInfo then
  begin
    Result := Left.AsPointer = Right.AsPointer;
  end else
  begin
    Result := False;
  end;
end;

{ TValueHelper }

function TValueHelper.AsDouble: Double;
begin
  Result := AsType<Double>;
end;

function TValueHelper.AsFloat: Extended;
begin
  Result := AsType<Extended>;
end;

function TValueHelper.AsPointer: Pointer;
begin
  ExtractRawDataNoCopy(@Result);
end;

function TValueHelper.AsSingle: Single;
begin
  Result := AsType<Single>;
end;

function TValueHelper.Equals(const value : TValue) : boolean;
begin
  result := SameValue(Self, value);
end;

function TValueHelper.IsBoolean: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Boolean);
end;

function TValueHelper.IsByte: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Byte);
end;

function TValueHelper.IsCardinal: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Cardinal);
end;

function TValueHelper.IsCurrency: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Currency);
end;

function TValueHelper.IsDate: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(TDate);
end;

function TValueHelper.IsDateTime: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(TDateTime);
end;

function TValueHelper.IsDouble: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Double);
end;

function TValueHelper.IsFloat: Boolean;
begin
  Result := Kind = tkFloat;
end;

function TValueHelper.IsInt64: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Int64);
end;

function TValueHelper.IsInteger: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Integer);
end;

function TValueHelper.IsNumeric: Boolean;
begin
  Result := Kind in [tkInteger, tkChar, tkEnumeration, tkFloat, tkWChar, tkInt64];
end;

function TValueHelper.IsPointer: Boolean;
begin
  Result := Kind = tkPointer;
end;

function TValueHelper.IsShortInt: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(ShortInt);
end;

function TValueHelper.IsSingle: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Single);
end;

function TValueHelper.IsSmallInt: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(SmallInt);
end;

function TValueHelper.IsString: Boolean;
begin
  Result := Kind in [tkChar, tkString, tkWChar, tkLString, tkWString, tkUString];
end;

function TValueHelper.IsTime: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(TTime);
end;

function TValueHelper.IsUInt64: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(UInt64);
end;

function TValueHelper.IsVariant: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Variant);
end;

function TValueHelper.IsWord: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(Word);
end;

function TValueHelper.IsGuid: Boolean;
begin
  Result := TypeInfo = System.TypeInfo(TGUID);
end;



{ TRttiTypeHelper }

function TRttiTypeHelper.FindConstructor: TRttiMethod;
var
  candidateCtor: TRttiMethod;
begin
  Result := nil;
  for candidateCtor in GetMethods('Create') do
  begin
    if Length(candidateCtor.GetParameters) = 0 then
    begin
      Result := candidateCtor;
      Break;
    end;
  end;
end;

function TRttiTypeHelper.TryGetMethod(const AName: string; out AMethod: TRttiMethod): Boolean;
begin
  AMethod := GetMethod(AName);
  Result := Assigned(AMethod);
end;

end.
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