static void ToStyle <T>(ExpressionValue expression, ref T controlStyle) where T : struct, IConvertible
{
if (expression == null)
{
return;
}
var tokens = expression.Tokens.Where(tok => tok.Name != Tokens.Pipe).ToArray();
Debug.Assert(tokens.All(tok => tok.Name == Tokens.Ident || tok.Name == Tokens.Integer || tok.Name == Tokens.Not));
uint value = EnumConverter <T> .ConvertFromEnum(controlStyle);
for (uint n = 0; n < tokens.Length;)
{
var tok = tokens[n];
if (tok.Name == Tokens.Not)
{
Debug.Assert(n + 1 < tokens.Length);
uint val = ReadValue <T>(tokens[n + 1]);
if (val != 0)
{
value &= ~val;
}
n += 2;
}
else
{
value |= ReadValue <T>(tokens[n]);
n++;
}
}
controlStyle = EnumConverter <T> .ConvertToEnum(value);
}
static uint ReadValue <T>(Token tok) where T : struct, IConvertible
{
if (tok.Name == Tokens.Ident)
{
T style;
if (Enum.TryParse(tok.Text, out style))
{
return(EnumConverter <T> .ConvertFromEnum(style));
}
else
{
Debug.WriteLine($"Unknown style: {tok.Text}");
return(0);
}
}
else if (tok.Name == Tokens.Integer)
{
uint style;
if (uint.TryParse(tok.Text, out style))
{
return(style);
}
Debug.WriteLine($"Unable to parse: {tok.Text}");
return(0);
}
else
{
Debug.Assert(false);
return(0);
}
}