internal static ExpressionSyntax GenerateNonEnumValueExpression(ITypeSymbol type, object value,
bool canUseFieldReference)
{
return(value switch
{
bool val => GenerateBooleanLiteralExpression(val),
string val => GenerateStringLiteralExpression(val),
char val => GenerateCharLiteralExpression(val),
sbyte val => GenerateLiteralExpression(type, val, LiteralSpecialValues.SByteSpecialValues, null,
canUseFieldReference, (s, v) => SyntaxFactory.Literal(s, v), x => x < 0, x => (sbyte)-x, "128"),
short val => GenerateLiteralExpression(type, val, LiteralSpecialValues.Int16SpecialValues, null,
canUseFieldReference, (s, v) => SyntaxFactory.Literal(s, v), x => x < 0, x => (short)-x, "32768"),
int val => GenerateLiteralExpression(type, val, LiteralSpecialValues.Int32SpecialValues, null,
canUseFieldReference, SyntaxFactory.Literal, x => x < 0, x => - x, "2147483648"),
long val => GenerateLiteralExpression(type, val, LiteralSpecialValues.Int64SpecialValues, null,
canUseFieldReference, SyntaxFactory.Literal, x => x < 0, x => - x, "9223372036854775808"),
byte val => GenerateNonNegativeLiteralExpression(type, val, LiteralSpecialValues.ByteSpecialValues, null,
canUseFieldReference, (s, v) => SyntaxFactory.Literal(s, v)),
ushort val => GenerateNonNegativeLiteralExpression(type, val, LiteralSpecialValues.UInt16SpecialValues, null,
canUseFieldReference, (s, v) => SyntaxFactory.Literal(s, (uint)v)),
uint val => GenerateNonNegativeLiteralExpression(type, val, LiteralSpecialValues.UInt32SpecialValues, null,
canUseFieldReference, SyntaxFactory.Literal),
ulong val => GenerateNonNegativeLiteralExpression(type, val, LiteralSpecialValues.UInt64SpecialValues, null,
canUseFieldReference, SyntaxFactory.Literal),
float val => GenerateSingleLiteralExpression(type, val, canUseFieldReference),
double val => GenerateDoubleLiteralExpression(type, val, canUseFieldReference),
decimal val => GenerateLiteralExpression(type, val, LiteralSpecialValues.DecimalSpecialValues, null,
canUseFieldReference, SyntaxFactory.Literal, x => x < 0, x => - x, null),
_ => type == null || type.IsReferenceType || type is IPointerTypeSymbol || type.IsNullable()
? GenerateNullLiteral()
: (ExpressionSyntax)CSharpSyntaxGenerator.DefaultExpression(type)
});
private static SyntaxNode CreateMemberAccessExpression(
IFieldSymbol field, INamedTypeSymbol enumType, SpecialType underlyingSpecialType)
{
if (SyntaxFacts.IsValidIdentifier(field.Name))
{
return(CSharpSyntaxGenerator.MemberAccessExpression(
enumType.GenerateTypeSyntax(),
SyntaxFactory.IdentifierName(field.Name)));
}
return(CreateExplicitlyCastedLiteralValue(enumType, underlyingSpecialType, field.ConstantValue));
}
