public override ParseErrorExpression BuildTrigger(TriggerBuilderContext context, InterpreterScope scope, FunctionCallExpression functionCall)
{
ExpressionBase result;
int addHitsClauses = 0;
int subHitsClauses = 0;
var requirements = new List <ICollection <Requirement> >();
for (int i = 1; i < functionCall.Parameters.Count; ++i)
{
var condition = functionCall.Parameters.ElementAt(i);
var conditionRequirements = new List <Requirement>();
var nestedContext = new TriggerBuilderContext()
{
Trigger = conditionRequirements
};
var modifier = RequirementType.AddHits;
var funcCall = condition as FunctionCallExpression;
if (funcCall != null && funcCall.FunctionName.Name == "deduct")
{
var deductScope = funcCall.GetParameters(scope.GetFunction(funcCall.FunctionName.Name), scope, out result);
if (deductScope == null)
{
return((ParseErrorExpression)result);
}
condition = deductScope.GetVariable("comparison");
modifier = RequirementType.SubHits;
++subHitsClauses;
}
else
{
++addHitsClauses;
}
var error = BuildTriggerCondition(nestedContext, scope, condition);
if (error != null)
{
return(error);
}
conditionRequirements.Last().Type = modifier;
requirements.Add(conditionRequirements);
}
// if no requirements were generated, we're done
if (requirements.Count == 0)
{
return(null);
}
// if there's any SubHits clauses, add a dummy clause for the final count, regardless of whether
// the AddHits clauses have hit targets.
if (subHitsClauses > 0)
{
if (addHitsClauses == 0)
{
return(new ParseErrorExpression("tally requires at least one non-deducted item"));
}
requirements.Add(new Requirement[] { AlwaysFalseFunction.CreateAlwaysFalseRequirement() });
}
// the last item cannot have its own HitCount as it will hold the HitCount for the group.
// if necessary, find one without a HitCount and make it the last.
AchievementBuilder.EnsureLastGroupHasNoHitCount(requirements);
// load the requirements into the trigger
foreach (var requirement in requirements)
{
foreach (var clause in requirement)
{
context.Trigger.Add(clause);
}
}
// the last item of each clause was set to AddHits, change the absolute last back to None
context.LastRequirement.Type = RequirementType.None;
// set the target hitcount
var count = (IntegerConstantExpression)functionCall.Parameters.First();
context.LastRequirement.HitCount = (uint)count.Value;
return(null);
}
protected ParseErrorExpression EvaluateCondition(TriggerBuilderContext context, InterpreterScope scope, ConditionalExpression condition)
{
ExpressionBase result;
var builder = new ScriptInterpreterAchievementBuilder();
if (!TriggerBuilderContext.ProcessAchievementConditions(builder, condition, scope, out result))
{
return((ParseErrorExpression)result);
}
if (builder.CoreRequirements.Any())
{
var error = ProcessOrNextSubClause(builder.CoreRequirements);
if (error != null)
{
return(error);
}
if (builder.AlternateRequirements.Count == 0)
{
// everything was converted to an OrNext. convert the last back
builder.CoreRequirements.Last().Type = RequirementType.None;
// one of the alts was entirely promoted to Core. We only need to check for that.
foreach (var clause in builder.CoreRequirements)
{
context.Trigger.Add(clause);
}
return(null);
}
// core requirements have to be injected into each subclause as a series of AndNext's
builder.CoreRequirements.Last().Type = RequirementType.AndNext;
}
var requirements = new List <ICollection <Requirement> >();
foreach (var altGroup in builder.AlternateRequirements)
{
var error = ProcessOrNextSubClause(altGroup);
if (error != null)
{
return(error);
}
if (builder.CoreRequirements.Any())
{
var merged = new List <Requirement>(builder.CoreRequirements);
merged.AddRange(altGroup);
requirements.Add(merged);
}
else
{
requirements.Add(altGroup);
}
}
// the last item cannot have its own HitCount as it will hold the HitCount for the group.
// if necessary, find one without a HitCount and make it the last.
int index = requirements.Count - 1;
if (requirements[index].Last().HitCount > 0)
{
do
{
index--;
} while (index >= 0 && requirements[index].Last().HitCount > 0);
if (index == -1)
{
// all requirements had HitCount limits, add a dummy item that's never true for the total HitCount
requirements.Add(new Requirement[] { AlwaysFalseFunction.CreateAlwaysFalseRequirement() });
}
else
{
// found a requirement without a HitCount limit, move it to the last spot for the total HitCount
var requirement = requirements[index];
requirements.RemoveAt(index);
requirements.Add(requirement);
}
}
// if we can guarantee the individual requirements won't be true in the same frame, we can use AddHits
// instead of OrNext to improve compatibility with older versions of RetroArch
if (CanUseAddHits(requirements))
{
foreach (var requirement in requirements)
{
foreach (var cond in requirement)
{
if (cond.Type == RequirementType.OrNext)
{
cond.Type = RequirementType.AddHits;
}
}
}
}
else
{
// an AndNext in the first clause is acceptable, but once we see the first
// OrNext, each clause must be a single logical condition as AndNext has the
// same priority as OrNext and will not be processed first.
for (int i = 1; i < requirements.Count; ++i)
{
if (requirements[i].Any(r => r.Type == RequirementType.AndNext))
{
return(new ParseErrorExpression("Cannot join multiple AndNext chains with OrNext"));
}
}
}
// everything was converted to an OrNext. convert the last back
requirements.Last().Last().Type = RequirementType.None;
// load the requirements into the trigger
foreach (var requirement in requirements)
{
foreach (var clause in requirement)
{
context.Trigger.Add(clause);
}
}
return(null);
}