private Expression ParseFactor()
{
Expression factor;
if (CurrentToken.Type == TokenType.Identifier)
{
factor = ParseCallOrVarExpr();
}
else if (Accept(TokenType.IntLiteral))
{
factor = new IntLiteralExpr(AcceptedToken);
}
else if (Accept(TokenType.StringLiteral))
{
factor = new StringLiteralExpr(AcceptedToken);
}
else if (Accept(TokenType.RealLiteral))
{
factor = new RealLiteralExpr(AcceptedToken);
}
else if (Accept(TokenType.LParen))
{
Expression expr = ParseExpression();
Match(TokenType.RParen);
factor = expr;
}
else if (Accept(TokenType.OpNot))
{
UnaryExpr expr = new UnaryExpr(AcceptedToken);
expr.Op = Operator.Not;
expr.Expr = ParseFactor();
factor = expr;
}
else
{
throw new Exception(string.Format("Expected a factor, {0} found", CurrentToken.Type));
}
if (Accept(TokenType.OpDot))
{
MemberAccessExpr expr = new MemberAccessExpr(AcceptedToken);
expr.AccessedExpr = factor;
expr.MemberId = ParseIdentifier();
return(expr);
}
return(factor);
}
private void Visit(IntLiteralExpr intLiteral)
{
CurrentMethodIL.Emit(OpCodes.Ldc_I4, intLiteral.Value);
ApplyExprSign(intLiteral);
}
private void Visit(IntLiteralExpr intLiteralExpr)
{
TypeStack.Push(TypeInfo.BasicInt);
}