protected override MethodResult Get()
{
VarRef targetVariable = (VarRef)Parameters[0];
if (targetVariable.Var is IndexedVar == false)
{
throw SyntaxErrorException.InvalidVarRefType(targetVariable.Var.Name, VarType.Indexed, ParameterLocations[0]);
}
IndexedVar var = (IndexedVar)targetVariable.Var;
VariableChaseData chaseData = GetChaseData(var, TranslateContext);
Element[] actions = ArrayBuilder <Element> .Build
(
chaseData.Rate.SetVariable(new V_Number(0), targetVariable.Target)
);
return(new MethodResult(actions, null));
}
public VariableChaseData GetChaseData(IndexedVar var, TranslateRule context)
{
var existingChaseData = context.ParserData.Chasing.FirstOrDefault(cd => cd.Var == var);
if (existingChaseData != null)
{
return(existingChaseData);
}
IndexedVar destination = context.VarCollection.AssignVar(null, $"'{var.Name}' chase destination", var.IsGlobal, null);
IndexedVar rate = context.VarCollection.AssignVar(null, $"'{var.Name}' chase duration", var.IsGlobal, null);
VariableChaseData newChaseData = new VariableChaseData(var, destination, rate);
context.ParserData.Chasing.Add(newChaseData);
Rule chaseRule = new Rule(
Constants.INTERNAL_ELEMENT + "Chase Variable: " + var.Name,
var.IsGlobal ? RuleEvent.OngoingGlobal : RuleEvent.OngoingPlayer
);
chaseRule.Conditions = new Condition[]
{
new Condition(
rate.GetVariable(),
Operators.NotEqual,
new V_Number(0)
)
};
chaseRule.Actions = ArrayBuilder <Element> .Build(
UpdateVariable(var, destination, rate),
A_Wait.MinimumWait,
new A_LoopIfConditionIsTrue()
);
context.ParserData.AdditionalRules.Add(chaseRule);
return(newChaseData);
}