/// <summary>
/// Change any twine variable values as appropriate. This includes
/// addition as well as assignment.
/// </summary>
private void RunVariableAssignments()
{
if (assignmentVars != null)
{
if (globalVariables == null)
{
globalVariables = TwineVariables.GetVariableObject();
}
// This character is a marker that says to use addition rather than
// assignment.
string plusSign = "+";
for (int i = 0; i < assignmentVars.Count; i++)
{
string varName = assignmentVars[i];
string varValue = assignmentVals[i];
if (!varValue.Contains(plusSign))
{
globalVariables.AssignValue(varName, varValue);
}
else
{
// Remove the "+" marker and increment value
varValue = varValue.Substring(1);
globalVariables.IncrementValue(varName, varValue);
}
}
}
}
public static TwineVariables GetVariableObject()
{
if (instance == null)
{
instance = new TwineVariables();
}
return(instance);
}
/// <summary>
/// Sets validChildren and validChildNames to include only the links that are allowed by the conditionals assigned to them.
/// </summary>
private void UpdateConditionalLinks()
{
if (conditionalVars.Count > 0)
{
if (globalVariables == null)
{
globalVariables = TwineVariables.GetVariableObject();
}
List <GameObject> checkedChildren = new List <GameObject>();
List <string> checkedChildNames = new List <string>();
for (int index = 0; index < linkNames.Length; index++)
{
if (!conditionalLinks.Contains(linkNames[index]))
{
checkedChildNames.Add(linkNames[index]);
checkedChildren.Add(children[index]);
}
else
{
string linkName = linkNames[index];
int condIndex = conditionalLinks.IndexOf(linkName);
string varName = conditionalVars[condIndex];
// Operation of the condition - e.g. "=", "!="
string operation = conditionalOp[condIndex];
// Truth value of the conditional
bool conditionMet = false;
switch (operation)
{
// For equals and not equals, we compare the values
// without caring if they can be converted to ints.
case "=":
conditionMet = globalVariables.GetValue(varName) == conditionalVals[condIndex];
break;
case "!=":
conditionMet = !(globalVariables.GetValue(varName) == conditionalVals[condIndex]);
break;
default:
// For greater-than/less-than-style comparisons, we
// break and leave conditionMet as false unless both
// values can be converted to ints.
int val1;
if (!Int32.TryParse(globalVariables.GetValue(varName), out val1))
{
break;
}
int val2;
if (!Int32.TryParse(conditionalVals[condIndex], out val2))
{
break;
}
switch (operation)
{
case "<":
if (val1 < val2)
{
conditionMet = true;
}
break;
case "<=":
if (val1 <= val2)
{
conditionMet = true;
}
break;
case ">":
if (val1 > val2)
{
conditionMet = true;
}
break;
case ">=":
if (val1 >= val2)
{
conditionMet = true;
}
break;
default:
conditionMet = false;
Exception e = new Exception("Twine conditional has unknown operation");
throw e;
}
break;
}
if (conditionMet)
{
checkedChildNames.Add(linkNames[index]);
checkedChildren.Add(children[index]);
}
}
}
validLinkNames = checkedChildNames.ToArray();
validChildren = checkedChildren.ToArray();
}
else
{
validLinkNames = linkNames;
validChildren = children;
}
}
