private static int EvaluateIntUnaryExpression(DaedalusParser.ExpressionContext expression,
AssemblyBuilder assemblyBuilder)
{
var oper = expression.GetChild(0).GetText();
var param = EvaluateConstIntExpression((DaedalusParser.ExpressionContext)expression.GetChild(1),
assemblyBuilder);
switch (oper)
{
case "-":
return(-param);
case "+":
return(+param);
case "!":
return(param == 0 ? 1 : 0);
case "~":
return(~param);
default:
throw new Exception($"Invalid unary operator: {oper}");
}
}
private static string EvaluateConstStringExpression(DaedalusParser.ExpressionContext expression)
{
if (expression is DaedalusParser.ValExpressionContext context)
{
return(context.value().GetChild(0).GetText().Replace("\"", ""));
}
throw new Exception(
$"Unable to evaluate constant. Expression '{expression.GetText()}' contains unsupported operations.");
}
private static int EvaluateConstIntExpression(DaedalusParser.ExpressionContext expression,
AssemblyBuilder assemblyBuilder)
{
if (expression is DaedalusParser.BracketExpressionContext expressionContext)
{
return(EvaluateConstIntExpression(expressionContext.expression(), assemblyBuilder));
}
if (expression is DaedalusParser.ValExpressionContext context)
{
return(EvaluateIntValueExpression(context.value(), assemblyBuilder));
}
if (expression is DaedalusParser.OneArgExpressionContext)
{
return(EvaluateIntUnaryExpression(expression, assemblyBuilder));
}
if (expression is DaedalusParser.MultExpressionContext)
{
return(EvaluateIntBinaryExpression(expression, assemblyBuilder));
}
if (expression is DaedalusParser.AddExpressionContext)
{
return(EvaluateIntBinaryExpression(expression, assemblyBuilder));
}
if (expression is DaedalusParser.BitMoveExpressionContext)
{
return(EvaluateIntBinaryExpression(expression, assemblyBuilder));
}
if (expression is DaedalusParser.CompExpressionContext)
{
return(EvaluateIntBinaryExpression(expression, assemblyBuilder));
}
if (expression is DaedalusParser.EqExpressionContext)
{
return(EvaluateIntBinaryExpression(expression, assemblyBuilder));
}
if (expression is DaedalusParser.BinOrExpressionContext)
{
return(EvaluateIntBinaryExpression(expression, assemblyBuilder));
}
throw new Exception(
$"Unable to evaluate constant. Expression '{expression.GetText()}' contains unsupported operations.");
}
public static object EvaluateConst(DaedalusParser.ExpressionContext expression, AssemblyBuilder assemblyBuilder,
DatSymbolType type)
{
switch (type)
{
case DatSymbolType.String:
return(EvaluateConstStringExpression(expression));
case DatSymbolType.Float:
return(EvaluateConstFloatExpression(expression.GetText()));
case DatSymbolType.Int:
return(EvaluateConstIntExpression(expression, assemblyBuilder));
default:
throw new Exception($"Unable to evaluate constant. Invalid symbol type '{type}'.");
}
}
private static int EvaluateIntBinaryExpression(DaedalusParser.ExpressionContext expression,
AssemblyBuilder assemblyBuilder)
{
var leftParam = EvaluateConstIntExpression((DaedalusParser.ExpressionContext)expression.GetChild(0),
assemblyBuilder);
var oper = expression.GetChild(1).GetText();
var rightParam = EvaluateConstIntExpression((DaedalusParser.ExpressionContext)expression.GetChild(2),
assemblyBuilder);
switch (oper)
{
case "*":
return(leftParam * rightParam);
case "/":
return(leftParam / rightParam);
case "%":
return(leftParam % rightParam);
case "+":
return(leftParam + rightParam);
case "-":
return(leftParam - rightParam);
case ">>":
return(leftParam >> rightParam);
case "<<":
return(leftParam << rightParam);
case ">":
return(leftParam > rightParam ? 1 : 0);
case "<":
return(leftParam < rightParam ? 1 : 0);
case ">=":
return(leftParam >= rightParam ? 1 : 0);
case "<=":
return(leftParam <= rightParam ? 1 : 0);
case "==":
return(leftParam == rightParam ? 1 : 0);
case "!=":
return(leftParam != rightParam ? 1 : 0);
case "|":
return(leftParam | rightParam);
case "&":
return(leftParam & rightParam);
case "||":
return(((leftParam != 0) || (rightParam != 0)) ? 1 : 0);
case "&&":
return(((leftParam != 0) && (rightParam != 0)) ? 1 : 0);
default:
throw new Exception($"Invalid binary operator: {oper}");
}
}
