/// <summary>
/// Creates a generated expression from a typed constant.
/// </summary>
public static Expression?CreateGenerated(Context cx, TypedConstant constant, IExpressionParentEntity parent,
int childIndex, Extraction.Entities.Location location)
{
if (constant.IsNull ||
constant.Type is null)
{
return(Literal.CreateGeneratedNullLiteral(cx, parent, childIndex, location));
}
switch (constant.Kind)
{
case TypedConstantKind.Primitive:
return(Literal.CreateGenerated(cx, parent, childIndex, constant.Type, constant.Value, location));
case TypedConstantKind.Enum:
// Enum value is generated in the following format: (Enum)value
Action <Expression, int> createChild = (parent, index) => Literal.CreateGenerated(cx, parent, index, ((INamedTypeSymbol)constant.Type).EnumUnderlyingType !, constant.Value, location);
var cast = Cast.CreateGenerated(cx, parent, childIndex, constant.Type !, constant.Value, createChild, location);
return(cast);
case TypedConstantKind.Type:
var type = ((ITypeSymbol)constant.Value !).OriginalDefinition;
return(TypeOf.CreateGenerated(cx, parent, childIndex, type, location));
case TypedConstantKind.Array:
// Single dimensional arrays are in the following format:
// * new Type[N] { item1, item2, ..., itemN }
// * new Type[0]
//
// itemI is generated recursively.
return(NormalArrayCreation.CreateGenerated(cx, parent, childIndex, constant.Type, constant.Values, location));
case TypedConstantKind.Error:
default:
cx.ExtractionError("Couldn't extract constant in attribute", constant.ToString(), location);
return(null);
}
}