public static IEnumerable <SyntaxNode> BuildIfCondition(this RoslynEcsTranslator translator, IfConditionNodeModel statement, IPortModel portModel)
{
// TODO: de-duplicate code after if stacks
var firstThenStack = RoslynTranslator.GetConnectedStack(statement, 0);
var firstElseStack = RoslynTranslator.GetConnectedStack(statement, 1);
// this enables more elegant code generation with no duplication
// find first stack reachable from both then/else stacks
var endStack = RoslynTranslator.FindCommonDescendant(firstThenStack, firstElseStack);
if (endStack != null)
{
// Debug.Log($"If in stack {statement.parentStackModel} Common descendant: {endStack}");
// building the branches will stop at the common descendant
translator.EndStack = endStack;
}
// ie. follow outputs, find all stacks with multiple inputs, compare them until finding the common one if it exists
// BuildStack should take an abort stack parameter, returning when recursing on it
// the parent buildStack call will then continue on this end stack
var thenBlock = Block();
if (endStack != firstThenStack)
{
translator.BuildStack(firstThenStack, ref thenBlock, StackExitStrategy.Inherit);
}
var elseBlock = Block();
if (endStack != firstElseStack)
{
translator.BuildStack(firstElseStack, ref elseBlock, StackExitStrategy.Inherit);
}
var ifNode = RoslynBuilder.IfStatement(
translator.BuildPort(statement.IfPort).SingleOrDefault(),
thenBlock,
elseBlock);
yield return(ifNode);
}
void BuildIfConditionNode(IfConditionNodeModel node, RoslynEcsTranslator translator, int stateIndex)
{
translator.BuildNode(node);
var firstThenStack = RoslynTranslator.GetConnectedStack(node, 0);
var firstElseStack = RoslynTranslator.GetConnectedStack(node, 1);
var ifState = m_States[stateIndex];
var ifIndex = GetCurrentStateIndex();
var endStackIndex = 0;
if (translator.EndStack != null)
{
m_StackIndexes.TryGetValue(translator.EndStack, out endStackIndex);
}
// Reserve then/else/complete states first
var thenIndex = ifIndex;
var thenBlock = Block().AddStatements(ReturnStatement(LiteralExpression(SyntaxKind.FalseLiteralExpression)));
StateData thenState = null;
if (firstThenStack != null)
{
if (firstThenStack == translator.EndStack && endStackIndex != 0)
{
thenBlock = Block().AddStatements(BuildGoToState(endStackIndex));
}
else
{
thenIndex += 1;
thenState = RequestNewState();
TryAddStackIndex(firstThenStack, thenIndex);
thenBlock = Block().AddStatements(BuildGoToState(thenIndex));
}
}
var elseIndex = thenIndex + 1;
var elseBlock = Block().AddStatements(ReturnStatement(LiteralExpression(SyntaxKind.FalseLiteralExpression)));
StateData elseState = null;
if (firstElseStack != null)
{
if (firstElseStack == translator.EndStack && endStackIndex != 0)
{
elseBlock = Block().AddStatements(BuildGoToState(endStackIndex));
}
else
{
elseState = RequestNewState();
TryAddStackIndex(firstElseStack, elseIndex);
elseBlock = Block().AddStatements(BuildGoToState(elseIndex));
}
}
// Then Build stacks
ifState.Statements.Add(RoslynBuilder.IfStatement(
translator.BuildPort(node.IfPort).SingleOrDefault(),
thenBlock,
elseBlock)
.WithAdditionalAnnotations(
new SyntaxAnnotation(Annotations.VSNodeMetadata, node.Guid.ToString())));
ifState.Statements.Add(ReturnStatement(LiteralExpression(SyntaxKind.TrueLiteralExpression)));
ifState.SkipStateBuilding = true;
var reserveEndStackState = translator.EndStack != null &&
translator.EndStack != firstElseStack &&
translator.EndStack != firstThenStack &&
endStackIndex == 0;
if (reserveEndStackState)
{
var endState = RequestNewState();
endState.NextStateIndex = GetNextStateIndex(translator.EndStack);
TryAddStackIndex(translator.EndStack, GetCurrentStateIndex());
}
var origBuiltStacks = translator.BuiltStacks;
translator.BuiltStacks = new HashSet <IStackModel>(origBuiltStacks);
if (translator.EndStack != firstThenStack)
{
if (translator.EndStack != null && thenState != null)
{
thenState.NextStateIndex = m_StackIndexes[translator.EndStack];
}
BuildStack(translator, firstThenStack, thenIndex, StackExitStrategy.Inherit);
}
var partialStacks = translator.BuiltStacks;
translator.BuiltStacks = new HashSet <IStackModel>(origBuiltStacks);
if (translator.EndStack != firstElseStack)
{
if (translator.EndStack != null && elseState != null)
{
elseState.NextStateIndex = m_StackIndexes[translator.EndStack];
}
BuildStack(translator, firstElseStack, elseIndex, StackExitStrategy.Inherit);
}
translator.BuiltStacks.UnionWith(partialStacks);
}