private static void CreateExpressions(ExpressionSyntax ifExpression, ExpressionSyntax elseExpression,
ITypeSymbol ifType, ITypeSymbol elseType,
ITypeSymbol ifConvertedType, ITypeSymbol elseConvertedType,
TypeSyntax typeSyntax, SemanticModel semanticModel,
out ExpressionSyntax trueExpression, out ExpressionSyntax falseExpression)
{
var isNullable = false;
if (ifConvertedType?.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
var constValue = semanticModel.GetConstantValue(ifExpression);
if (constValue.HasValue && constValue.Value == null)
{
trueExpression = SyntaxFactory.CastExpression(typeSyntax, ifExpression);
}
else
{
trueExpression = ifExpression;
}
isNullable = true;
}
else
{
trueExpression = ifExpression;
}
if (elseConvertedType?.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
var constValue = semanticModel.GetConstantValue(elseExpression);
if (constValue.HasValue && constValue.Value == null)
{
falseExpression = SyntaxFactory.CastExpression(typeSyntax, elseExpression);
}
else
{
falseExpression = elseExpression;
}
isNullable = true;
}
else
{
falseExpression = elseExpression;
}
if (!isNullable && !ifType.CanBeAssignedTo(elseType) || !elseType.CanBeAssignedTo(ifType))
{
trueExpression = CastToBaseType(ifExpression, ifType, elseType, trueExpression);
}
}
private static void CreateExpressions(ExpressionSyntax ifExpression, ExpressionSyntax elseExpression,
ITypeSymbol ifType, ITypeSymbol elseType,
ITypeSymbol ifConvertedType, ITypeSymbol elseConvertedType,
TypeSyntax typeSyntax, SemanticModel semanticModel,
out ExpressionSyntax trueExpression, out ExpressionSyntax falseExpression)
{
var isNullable = false;
if (ifConvertedType?.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
var constValue = semanticModel.GetConstantValue(ifExpression);
trueExpression = constValue.HasValue && constValue.Value == null
? SyntaxFactory.CastExpression(typeSyntax, ifExpression)
: ifExpression;
isNullable = true;
}
else
{
trueExpression = ifExpression;
}
if (elseConvertedType?.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
var constValue = semanticModel.GetConstantValue(elseExpression);
falseExpression = constValue.HasValue && constValue.Value == null
? SyntaxFactory.CastExpression(typeSyntax, elseExpression)
: elseExpression;
isNullable = true;
}
else
{
falseExpression = elseExpression;
}
if (!elseType.HasImplicitNumericConversion(ifType) &&
!IsEnumAndZero(ifType, elseExpression) &&
!IsEnumAndZero(elseType, ifExpression) &&
(!isNullable && !ifType.CanBeAssignedTo(elseType) || !elseType.CanBeAssignedTo(ifType)) &&
ifType != ifConvertedType)
{
trueExpression = CastToConvertedType(ifExpression, ifConvertedType);
}
}
protected virtual bool ShouldCreateConversionBetweenTypes(ITypeSymbol targetType, ITypeSymbol sourceType)
{
return(sourceType.CanBeAssignedTo(targetType) == false && ObjectHelper.IsSimpleType(targetType) == false && ObjectHelper.IsSimpleType(sourceType) == false);
}