public ParameterEmitter(TypeEmitter typeEmitter)
{
_typeEmitter = typeEmitter;
_keywords = new HashSet <string>(StringComparer.Ordinal)
{
"abstract", "as", "base", "bool", "break", "byte", "case",
"catch", "char", "checked", "class", "const", "continue",
"decimal", "default", "delegate", "do", "double", "else", "enum",
"event", "explicit", "extern", "false", "finally", "fixed", "float",
"for", "foreach", "goto", "if", "implicit", "in", "int", "interface",
"internal", "is", "lock", "long", "namespace", "new", "null", "object",
"operator", "out", "override", "params", "private", "protected",
"public", "readonly", "ref", "return", "sbyte", "sealed", "short",
"sizeof", "stackalloc", "static", "string", "struct", "switch",
"this", "throw", "true", "try", "typeof", "uint", "ulong", "unchecked",
"unsafe", "ushort", "using", "virtual", "void", "volatile", "while"
};
_numericTypes = new HashSet <Type>
{
typeof(int), typeof(double), typeof(decimal),
typeof(long), typeof(short), typeof(sbyte),
typeof(byte), typeof(ulong), typeof(ushort),
typeof(uint), typeof(float)
};
}
private string GetDefaultValue(ParameterSignature parameter, TypeEmitter writer)
{
if (!parameter.IsOptional)
{
return(string.Empty);
}
if (parameter.DefaultValue == null)
{
return("null");
}
var type = parameter.DefaultValue.GetType();
var value = parameter.DefaultValue;
// Nullable?
if (parameter.ParameterType.Namespace.Name == "System" &&
parameter.ParameterType.Name == "Nullable")
{
// This is really only needing to account for char? and bool?
// Unwrap the type and use the same logic as non-nullable by calling the BuildParameterValueToken method.
var innerType = parameter.ParameterType.GenericParameters[0];
return($"({writer.GetString(innerType)}){BuildParameterValueToken(type, value)}");
}
// Enum or numeric?
if (parameter.ParameterType.IsEnum || _numericTypes.Contains(type))
{
// Nullable numerics are handled in the previous block, so just cast it and use the value.
return(string.Format(CultureInfo.InvariantCulture, "({0}){1}",
writer.GetString(parameter.ParameterType),
value));
}
return(BuildParameterValueToken(type, value));
}