public static IEnumerable <SyntaxNode> BuildIfCondition(this RoslynTranslator translator, IfConditionNodeModel statement, IPortModel portModel)
{
// this enables more elegant code generation with no duplication
// if() { then(); } else { else(); }
// codeAfterIf();
// instead of duplicating the code after the if in each branch
// find first stack reachable from both then/else stacks
var endStack = RoslynTranslator.FindConnectedStacksCommonDescendant(statement);
if (endStack != null)
{
// building the branches will stop at the common descendant
translator.EndStack = endStack;
// Debug.Log($"If in stack {statement.parentStackModel} Common descendant: {endStack}");
}
// ie. follow outputs, find all stacks with multiple inputs, compare them until finding the common one if it exists
// BuildStack checks the m_EndStack field, returning when recursing on it
// the parent buildStack call will then continue on this end stack
StatementSyntax syntax = null;
// construct multiple if else if else ... from right to left, starting with the last else
foreach (var conditionWithAction in statement.ConditionsWithActionsPorts.Reverse())
{
var stack = RoslynTranslator.GetConnectedStack(conditionWithAction.Action);
BlockSyntax block = SyntaxFactory.Block();
if (endStack == null || endStack != stack) // stop before the end stack
{
translator.BuildStack(stack, ref block, StackExitStrategy.Inherit);
}
if (conditionWithAction.Condition == null) // last else
{
syntax = block;
}
else // if = if() { current statement } else { prev statement that might be an if }
{
var condition = (ExpressionSyntax)translator.BuildPort(conditionWithAction.Condition).SingleOrDefault();
syntax = SyntaxFactory.IfStatement(condition, block)
.WithElse(SyntaxFactory.ElseClause(syntax));
}
}
yield return(syntax);
}
