double Evaluator::eval(BinaryOp &e) {
double left = e.getLeft()->eval(*this);
double right = e.getRight()->eval(*this);
if (right == 0 &&
(e.getType() == Operator::DIV_OP || e.getType() == Operator::MOD_OP)) {
LOG_ERROR(e.getLocation() << ": Divide by zero");
return 0;
}
// NOTE, LinuxCNC handles floating-point equality differently.
// See ``Equality and floating-point values``.
switch (e.getType()) {
case Operator::EXP_OP: return pow(left, right);
case Operator::MUL_OP: return left * right;
case Operator::DIV_OP: return left / right;
case Operator::MOD_OP: return fmod(left, right);
case Operator::ADD_OP: return left + right;
case Operator::SUB_OP: return left - right;
case Operator::EQ_OP: return left == right;
case Operator::NE_OP: return left != right;
case Operator::GT_OP: return left > right;
case Operator::GE_OP: return left >= right;
case Operator::LT_OP: return left < right;
case Operator::LE_OP: return left <= right;
case Operator::AND_OP: return left && right;
case Operator::OR_OP: return left || right;
case Operator::XOR_OP: return (bool)left ^ (bool)right;
default: THROW(e.getLocation() << " Invalid binary operator");
}
}
double Evaluator::eval(BinaryOp &e) {
double left = e.getLeft()->eval(*this);
double right = e.getRight()->eval(*this);
if (right == 0 &&
(e.getType() == Operator::DIV_OP || e.getType() == Operator::MOD_OP)) {
LOG_ERROR(e.getLocation() << ": Divide by zero");
return 0;
}
switch (e.getType()) {
case Operator::EXP_OP: return pow(left, right);
case Operator::MUL_OP: return left * right;
case Operator::DIV_OP: return left / right;
case Operator::MOD_OP: return fmod(left, right);
case Operator::ADD_OP: return left + right;
case Operator::SUB_OP: return left - right;
case Operator::EQ_OP: return left == right;
case Operator::NE_OP: return left != right;
case Operator::GT_OP: return left > right;
case Operator::GE_OP: return left >= right;
case Operator::LT_OP: return left < right;
case Operator::LE_OP: return left <= right;
case Operator::AND_OP: return left && right;
case Operator::OR_OP: return left || right;
case Operator::XOR_OP: return (bool)left ^ (bool)right;
default: THROWS(e.getLocation() << " Invalid binary operator");
}
}
int Expr::evaluateAsInteger(){
if (isIntExpr()){
return ((IntExpr*)this)->getValue();
}
if (isBinaryExpr()){
BinaryExpr* binExpr = (BinaryExpr*)this;
int e1 = binExpr->getE1()->evaluateAsInteger();
int e2 = binExpr->getE1()->evaluateAsInteger();
BinaryOp* op = binExpr->getOp();
switch(op->getType()){
case BinaryOp::TIMES:
return e1*e2;
break;
case BinaryOp::MINUS:
return e1-e2;
break;
case BinaryOp::PLUS:
return e1+e2;
break;
default :
cerr << "Unsupported binary expression for evaluation" << endl;
exit(1);
}
}
cerr << "Can't evaluate this expression";
exit(1);
}