// executes a node, and returns either the name of the next node to run
// or null (indicating the dialogue is over)
internal IEnumerable <Dialogue.RunnerResult> RunNode(Yarn.Parser.Node node)
{
// Clear the list of options when we start a new node
currentOptions = new List <Parser.OptionStatement> ();
// Run all of the statements in this node
foreach (var command in RunStatements(node.statements))
{
yield return(command);
}
// If we have no options, we're all done
if (currentOptions.Count == 0)
{
yield return(new Dialogue.NodeCompleteResult(null));
yield break;
}
else
{
// We have options!
// If we have precisely one option and it's got no label, jump to it
if (currentOptions.Count == 1 &&
currentOptions[0].label == null)
{
yield return(new Dialogue.NodeCompleteResult(currentOptions [0].destination));
yield break;
}
// Otherwise, ask which option to pick...
var optionStrings = new List <string> ();
foreach (var option in currentOptions)
{
var label = option.label ?? option.destination;
optionStrings.Add(label);
}
Parser.OptionStatement selectedOption = null;
yield return(new Dialogue.OptionSetResult(optionStrings, delegate(int selectedOptionIndex) {
selectedOption = currentOptions[selectedOptionIndex];
}));
if (selectedOption == null)
{
dialogue.LogErrorMessage("Option chooser was never called!");
yield break;
}
// And jump to its destination!
yield return(new Dialogue.NodeCompleteResult(selectedOption.destination));
}
yield break;
}
void GenerateCode(Node node, Parser.OptionStatement statement)
{
if (statement.label == null)
{
// this is a jump to another node
Emit(node, ByteCode.RunNode, statement.destination);
}
else
{
var stringID = program.RegisterString(statement.label);
Emit(node, ByteCode.AddOption, stringID, statement.destination);
}
}
void GenerateCode(Node node, Parser.OptionStatement statement)
{
var destination = statement.destination;
if (statement.label == null)
{
// this is a jump to another node
Emit(node, ByteCode.RunNode, destination);
}
else
{
var lineID = GetLineIDFromNodeTags(statement.parent);
var stringID = program.RegisterString(statement.label, node.name, lineID, statement.lineNumber, true);
Emit(node, ByteCode.AddOption, stringID, destination);
}
}
