/// <summary>
/// Creates a generated expression for a default argument value.
/// </summary>
public static Expression?CreateGenerated(Context cx, IParameterSymbol parameter, IExpressionParentEntity parent,
int childIndex, Extraction.Entities.Location location)
{
if (!parameter.HasExplicitDefaultValue)
{
return(null);
}
var defaultValue = parameter.ExplicitDefaultValue;
if (parameter.Type is INamedTypeSymbol nt && nt.EnumUnderlyingType is not null)
{
// = (MyEnum)1, = MyEnum.Value1, = default(MyEnum), = new MyEnum()
// we're generating a (MyEnum)value cast expression:
defaultValue ??= 0;
Action <Expression, int> createChild = (parent, index) => Literal.CreateGenerated(cx, parent, index, nt.EnumUnderlyingType, defaultValue, location);
return(Cast.CreateGenerated(cx, parent, childIndex, parameter.Type, defaultValue, createChild, location));
}
if (defaultValue is null)
{
// = null, = default, = default(T), = new MyStruct()
// we're generating a default expression:
return(Default.CreateGenerated(cx, parent, childIndex, location, parameter.Type.IsReferenceType ? ValueAsString(null) : null));
}
// const literal:
return(Literal.CreateGenerated(cx, parent, childIndex, parameter.Type, defaultValue, location));
}
/// <summary>
/// Creates a generated expression for a default argument value.
/// </summary>
public static Expression?CreateGenerated(Context cx, IParameterSymbol parameter, IExpressionParentEntity parent,
int childIndex, Extraction.Entities.Location location)
{
if (!parameter.HasExplicitDefaultValue ||
parameter.Type is IErrorTypeSymbol)
{
return(null);
}
var defaultValue = parameter.ExplicitDefaultValue;
var type = parameter.Type;
if (type.IsBoundNullable() && type is INamedTypeSymbol named)
{
type = named.TypeArguments[0];
}
if (type is INamedTypeSymbol nt && nt.EnumUnderlyingType is not null)
{
// = (MyEnum)1, = MyEnum.Value1, = default(MyEnum), = new MyEnum()
// we're generating a (MyEnum)value cast expression:
defaultValue ??= 0;
Action <Expression, int> createChild = (parent, index) => Literal.CreateGenerated(cx, parent, index, nt.EnumUnderlyingType, defaultValue, location);
return(Cast.CreateGenerated(cx, parent, childIndex, parameter.Type, defaultValue, createChild, location));
}
if (defaultValue is null)
{
// = null, = default, = default(T), = new MyStruct()
// we're generating a default expression:
return(Default.CreateGenerated(cx, parent, childIndex, location, parameter.Type.IsReferenceType ? ValueAsString(null) : null));
}
if (parameter.Type.SpecialType is SpecialType.System_Object)
{
// this can happen in VB.NET
cx.ExtractionError($"Extracting default argument value 'object {parameter.Name} = default' instead of 'object {parameter.Name} = {defaultValue}'. The latter is not supported in C#.",
null, null, severity: Util.Logging.Severity.Warning);
// we're generating a default expression:
return(Default.CreateGenerated(cx, parent, childIndex, location, ValueAsString(null)));
}
// const literal:
return(Literal.CreateGenerated(cx, parent, childIndex, type, defaultValue, location));
}