//-------------------------------------------------------------------------
void ConstantExpression::unaryOperation( ConstantExpression& result, AST::UnaryExpression::Operator op ) const
{
if ( this->getType() == SCALAR_INVALID )
{
if ( mErrorHandler )
{
Error err( Error::ERR_INVALIDPARAMS, "uninitilized operand" );
mErrorHandler->handleError( &err );
}
result.setValue( 0. );
return;
}
else if ( this->getType() == SCALAR_BOOL && op != AST::UnaryExpression::NOT )
{
if ( mErrorHandler )
{
Error err( Error::ERR_INVALIDPARAMS, "boolean operand in arithmetical operation" );
mErrorHandler->handleError( &err );
}
result.setValue( 0. );
return;
}
else if ( this->getType() == SCALAR_BOOL && op == AST::UnaryExpression::NOT )
{
result.setValue( !this->getBoolValue() );
}
else if ( this->getType() == SCALAR_LONG )
{
result.setValue( unaryOperation( this->getLongValue(), op ) );
}
else
{
result.setValue( unaryOperation( this->getDoubleValue(), op ) );
}
}
Variant& StackMachine::evaluate(const VariableStore& store, const FunctionRegistry& functions)
{
reset();
for(const auto& instruction : _instructions) {
switch(instruction._opCode) {
case NOP: {
break;
}
case PUSH: {
_valueStack.emplace(instruction._value);
break;
}
case PUSHVAR: {
if(instruction._value.getType() != INT) {
CSVSQLDB_THROW(StackMachineException, "expected an INT as variable index");
}
int64_t index = instruction._value.asInt();
_valueStack.emplace(store[static_cast<size_t>(index)]);
break;
}
case ADD:
case SUB:
case DIV:
case MOD:
case MUL:
case EQ:
case NEQ:
case IS:
case ISNOT:
case GT:
case GE:
case LT:
case LE:
case AND:
case OR:
case CONCAT: {
const Variant lhs(getNextValue());
Variant& rhs(getTopValue());
rhs = binaryOperation(mapOpCodeToBinaryOperationType(instruction._opCode), lhs, rhs);
break;
}
case NOT: {
Variant& rhs(getTopValue());
rhs = unaryOperation(OP_NOT, BOOLEAN, rhs);
break;
}
case PLUS: {
// this is a nop, as the value will not change, so just leave it on the stack
break;
}
case MINUS: {
Variant& rhs = getTopValue();
rhs = unaryOperation(OP_MINUS, rhs.getType(), rhs);
break;
}
case BETWEEN: {
const Variant lhs = getNextValue();
const Variant from = getNextValue();
Variant& to = getTopValue();
Variant result(BOOLEAN);
if(not(lhs.isNull() || from.isNull() || to.isNull())) {
if(binaryOperation(OP_GE, to, from).asBool()) {
result = binaryOperation(OP_GE, lhs, from);
if(result.asBool()) {
result = binaryOperation(OP_LE, lhs, to);
}
} else {
result = binaryOperation(OP_GE, lhs, to);
if(result.asBool()) {
result = binaryOperation(OP_LE, lhs, from);
}
}
}
to = result;
break;
}
case FUNC: {
if(instruction._value.getType() != STRING) {
CSVSQLDB_THROW(StackMachineException, "expected a string as variable name");
}
std::string funcname = instruction._value.asString();
Function::Ptr func = functions.getFunction(funcname);
if(!func) {
CSVSQLDB_THROW(StackMachineException, "function '" << funcname << "' not found");
}
Variants parameter;
size_t count = func->getParameterTypes().size();
for(const auto& param : func->getParameterTypes()) {
Variant v = getNextValue();
if(param != v.getType()) {
try {
v = unaryOperation(OP_CAST, param, v);
} catch(const std::exception&) {
CSVSQLDB_THROW(StackMachineException,
"calling function '" << funcname << "' with wrong parameter");
}
}
parameter.emplace(parameter.end(), v);
--count;
}
if(count) {
CSVSQLDB_THROW(StackMachineException, "too much parameters for function '" << funcname << "'");
}
_valueStack.emplace(func->call(parameter));
break;
}
case CAST: {
Variant& rhs = getTopValue();
rhs = unaryOperation(OP_CAST, instruction._value.getType(), rhs);
break;
}
case IN: {
size_t count = static_cast<size_t>(instruction._value.asInt());
const Variant lhs = getNextValue();
bool found(false);
for(size_t n = 0; n < count; ++n) {
Variant result = binaryOperation(OP_EQ, lhs, getNextValue());
if(result.asBool()) {
found = true;
++n;
for(; n < count; ++n) {
// remove rest of the values from stack
_valueStack.pop();
}
break;
}
}
if(found) {
_valueStack.emplace(Variant(true));
} else {
_valueStack.emplace(Variant(false));
}
break;
}
case LIKE: {
if(!instruction._r) {
CSVSQLDB_THROW(StackMachineException, "expected a regexp in LIKE expression");
}
Variant lhs = getTopValue();
if(lhs.getType() != STRING) {
lhs = unaryOperation(OP_CAST, STRING, lhs);
CSVSQLDB_THROW(StackMachineException, "can only do like operations on strings");
}
if(instruction._r->match(lhs.asString())) {
_valueStack.emplace(Variant(true));
} else {
_valueStack.emplace(Variant(false));
}
break;
}
}
}
return _valueStack.top();
}
