/**
*Finds our parent entity and deletes it
*
*@param curState the current worldstate to reference during update
*@exception thrown if we do not have a valid entity parent, or if our target Entity is not set
*/
void ActionDestroyEntity::Update(const Library::WorldState& curState)
{
//Ensure our target entity name is set
if (mEntity == "")
{
throw std::exception("Our entity target cannot be unnamed!");
}
Scope* scope = this;
Entity* entity = nullptr;
bool condition = false;
//Iterate upwards to find our containing entity
while (!condition)
{
//Get the action scope above us
scope = scope->GetParent();
if (scope == nullptr)
{
throw std::exception("We do not have an Entity or ActionList parent! This is invalid.");
}
//Get our real parent, who is either an entity of an action list
scope = scope->GetParent();
if (scope == nullptr)
{
throw std::exception("We do not have an Entity or ActionList parent! This is invalid.");
}
//See if our grandparent scope is an Entity
entity = scope->As<Entity>();
//If our grandparent is an actionlist we need to keep iterating upwards through the heirarchy to find the containing Entity
//Else, we can delete the entity
if (entity != nullptr)
{
condition = true;
}
}
//Get the scope that contains the entity
Scope* targetParent = entity->GetParent();
//Remove the entity from the parent scope
if (targetParent != nullptr)
{
Datum* target = targetParent->Find(mEntity);
if (target != nullptr)
{
Scope* scope = target->Get<Scope*>();
scope->Orphan();
delete scope;
target->Set((Scope*)nullptr);
}
}
}
//Handle character data
bool XMLParseHelperExpression::CharDataHandler(XmlParseMaster::SharedData* data, std::string charData, std::uint32_t length)
{
SharedDataWorld* reinterpereted = data->As<SharedDataWorld>();
Scope* curAction = reinterpereted->GetAction();
if (reinterpereted != nullptr && curAction != nullptr)
{
ActionExpression* ae = curAction->As<ActionExpression>();
if (ae == nullptr)
{
return false;
}
/*
Format for infix expressions
lhs = operand1 operator1 operand2 operator2 ... operandN operatorN operandN+1
*/
//Read the char data into a string
std::string stringData;
for (std::uint32_t i = 0; i < length; i++)
{
stringData.push_back(charData[i]);
}
//Split the character data into tokens
//The pieces of the expression are only seperated by whitespace
SList<std::string> tokens;
std::istringstream iss(stringData);
std::string s;
std::string s2;
while (getline(iss, s, ' '))
{
tokens.PushBack(s);
}
//Get the table container refered to using the '.' syntax
//If the table in question is 'this', then it is referring to a datum in the same scope as the action
//Otherwise, we only allow for accessing other items in the same sector scope
//If there is no '.' in the first token, we assume that the item in question is a datum declared in scope of the raw sector the entity containing this action is in
//We check the raw sector case first
Scope* container;
if (tokens.Front().find('.') == std::string::npos)//Check if ther is no '.' character in the first token
{
if (reinterpereted->GetSector()->Find(tokens.Front()) != nullptr)//Check to see if the datum we're looking for is sitting in the raw sector
{
container = reinterpereted->GetSector();
ae->SetTarget(container->Find(tokens.Front()));
}
else
{
throw std::exception("Container specified as lvalue in expression could not be found");
}
}
else
{
//Reset the stringtream so we can parse the before and after the '.'
iss.str(tokens.Front());
iss.clear();
getline(iss, s, '.');
getline(iss, s2);
if (s == "this")
{
container = ae->GetContainer();
//In the context of an ActionList, we need to go up the chain until we hit an entity
/*while (container->Is("ActionList"))
{
container = ae->GetContainer();
}*/
}
else
{
if (reinterpereted->GetSector()->Entities()->Find(s) != nullptr)//Check to see if the datum we're looking for is a part of another entity in this sector
{
container = reinterpereted->GetSector()->Entities()->Find(s)->Get<Scope*>();
}
else
{
throw std::exception("Container specified as lvalue in expression could not be found");
}
}
if (container == nullptr)
{
throw std::exception("Container specified as lvalue in expression could not be found");
}
//Check that the first token refers to an lvalue that exists in the appropriate scope. Set it if it exists
ae->SetTarget(container->Search(s2));
}
//If the target doesn't exist, things are bad
if (ae->GetTarget() == nullptr)
{
throw std::exception("Expression target does not exist");
}
tokens.PopFront();
//Check that the next token is the assignment operator "="
if (tokens.Front() != "=")
{
throw std::exception("Expression missing assignment operator");
}
tokens.PopFront();
//Pass off the tokens to shunting yard
ae->SetExpression(ShuntingYard(tokens));
return true;
}
return false;
}
