private static bool MergeAddition(ExpressionBase left, ExpressionBase right, out ExpressionBase result)
{
// if either side is a string, combine to a larger string
if (left.Type == ExpressionType.StringConstant || right.Type == ExpressionType.StringConstant)
{
var builder = new StringBuilder();
left.AppendStringLiteral(builder);
right.AppendStringLiteral(builder);
result = new StringConstantExpression(builder.ToString());
return(true);
}
// if either side is a float, convert both to float
if (left.Type == ExpressionType.FloatConstant || right.Type == ExpressionType.FloatConstant)
{
if (!ConvertToFloat(ref left, ref right, out result))
{
return(false);
}
result = new FloatConstantExpression(((FloatConstantExpression)left).Value + ((FloatConstantExpression)right).Value);
return(true);
}
if (left.Type == ExpressionType.IntegerConstant && right.Type == ExpressionType.IntegerConstant)
{
result = new IntegerConstantExpression(((IntegerConstantExpression)left).Value + ((IntegerConstantExpression)right).Value);
return(true);
}
result = new ParseErrorExpression("Cannot add expressions");
return(false);
}
