public static IEnumerable <PapyrusSymbol> GetKnownParameterValueSymbols(this FunctionCallExpressionNode functionCallExpression, int parameterIndex, out bool valuesAreValidExclusively)
{
valuesAreValidExclusively = false;
var definedFunction = functionCallExpression.GetDefinition();
var parameterDefinition = functionCallExpression.GetParameterDefinition(parameterIndex);
#if FALLOUT4
if (parameterDefinition != null)
{
var parameterTypeName = parameterDefinition.TypeIdentifier.Text;
if (parameterTypeName.CaseInsensitiveEquals("CustomEventName"))
{
valuesAreValidExclusively = true;
return(GetKnownEventParameterSymbols <CustomEventSymbol>(functionCallExpression, parameterIndex));
}
if (parameterTypeName.CaseInsensitiveEquals("ScriptEventName"))
{
valuesAreValidExclusively = true;
return(GetKnownEventParameterSymbols <EventSymbol>(functionCallExpression, parameterIndex));
}
var functionName = definedFunction.Header.Identifier.Text;
if (functionName.CaseInsensitiveEquals("FindStruct") || functionName.CaseInsensitiveEquals("RFindStruct"))
{
if (parameterDefinition.Identifier.Text.CaseInsensitiveEquals("asVarName"))
{
valuesAreValidExclusively = true;
var definedFunctionScriptSymbol = definedFunction.Symbol.Script;
var elementTypeId = definedFunctionScriptSymbol.SyntheticArrayType?.ElementType;
if (elementTypeId.HasValue)
{
if (functionCallExpression.GetTypeChecker().GetTypeForObjectId(elementTypeId.Value) is StructType elementType)
{
return(elementType.Symbol.Children);
}
}
return(Enumerable.Empty <PapyrusSymbol>());
}
}
}
#endif
if (definedFunction.Symbol.Name.CaseInsensitiveEquals("GotoState"))
{
var expressionForScriptType = functionCallExpression.GetMemberAccessExpression()?.BaseExpression;
var scriptType = expressionForScriptType?.GetTypeOfExpression() as ScriptType ?? functionCallExpression.Script.Symbol.GetPapyrusType() as ScriptType;
return(scriptType.Symbol.GetExtendedScriptChain(true).
SelectMany(scriptSymbol => scriptSymbol.Children.OfType <StateSymbol>()).
DistinctBy(s => s.Name.ToLower()).ToArray());
}
return(Enumerable.Empty <PapyrusSymbol>());
}
private static IEnumerable <PapyrusSymbol> GetKnownEventParameterSymbols <T>(FunctionCallExpressionNode functionCallExpression, int parameterIndex)
where T : PapyrusSymbol
{
// If the event name parameter is not the first parameter:
// We assume that the first parameter's expression result is of the source type.
// If it *is* the first parameter:
// The defined function most likely lives on ScriptObject, so we need to find the derived type that is the subject of the call.
// So, either the source type is the base expression of the parent member access expression, -or-, if there is no member access expression,
// then it must be the current script type.
var expressionForSourceType = parameterIndex > 0 ?
functionCallExpression.Parameters.ElementAtOrDefault(0).Value : functionCallExpression.GetMemberAccessExpression()?.BaseExpression;
var sourceType = expressionForSourceType?.GetTypeOfExpression() as ScriptType ?? functionCallExpression.Script.Symbol.GetPapyrusType() as ScriptType;
// CustomEventNames can be inherited, so the symbols are sourced from the full extended script chain
return(sourceType.Symbol.GetExtendedScriptChain(true).SelectMany(scriptSymbol => scriptSymbol.Children.OfType <T>()).ToArray());
}