/// <summary>
/// on_event_statement :
/// (ON EVENT key | EXPIRE AFTER delay) switch_state+
/// ;
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override object VisitOn_event_statement([NotNull] WorkflowParser.On_event_statementContext context)
{
List <(string, ResultRuleConfig)> resultActions = new List <(string, ResultRuleConfig)>();
Func <RunContext, bool> whenRule = null;
string whenRuleText = string.Empty;
var key = context.key();
IncomingEventConfig incomingEvent = new IncomingEventConfig();
if (key != null)
{
incomingEvent.Name = (string)VisitKey(key);
}
if (context.EXPIRE() != null)
{
incomingEvent.Name = Constants.Events.ExpiredEventName;
int delay = (int)VisitDelay(context.delay());
whenRule = (ctx) =>
{
var i = ctx.IncomingEvent.ExtendedDatas()["CurrentState"];
if (i.GetValue == null)
{
return(false);
}
var j = i.GetValue(ctx)?.ToString();
return(ctx.Workflow.CurrentState == j);
};
whenRuleText = $"@IncomingEvent.CurrentState == @Workflow.CurrentState";
AddExpirationActions(resultActions, delay);
}
InsertTransitions(context, whenRule, incomingEvent, whenRuleText);
return(incomingEvent, resultActions);
}
private void InsertTransitions(WorkflowParser.On_event_statementContext context, Func <RunContext, bool> whenRule, IncomingEventConfig incomingEvent, string ruleText)
{
var switchs = context.switch_state();
foreach (var item in switchs)
{
var s = (TransitionConfig)VisitSwitch_state(item);
if (whenRule != null)
{
if (s.WhenRule == null)
{
s.WhenRule = whenRule;
s.WhenRuleText = ruleText;
}
else
{
var r = s.WhenRule;
s.WhenRule = (ctx) => whenRule(ctx) && r(ctx);
s.WhenRuleText += " && " + ruleText;
}
}
incomingEvent.AddTransition(s);
}
}
/// <summary>
/// Visit a parse tree produced by <see cref="WorkflowParser.on_event_statement"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitOn_event_statement([NotNull] WorkflowParser.On_event_statementContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// on_event_statement :
/// (ON EVENT key | EXPIRE AFTER delay) switch_state+
/// ;
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override object VisitOn_event_statement([NotNull] WorkflowParser.On_event_statementContext context)
{
return(base.VisitOn_event_statement(context));
}
