public static Activity MergeActivities(IList <Activity> activities)
{
return(ActivityMappingHelper.MergeActivities(activities));
}
public virtual Task <Activity> ProcessOutgoingActivitiesAsync(List <Activity> activities, ITurnContext turnContext)
{
return(Task.FromResult(ActivityMappingHelper.MergeActivities(activities)));
}
/// <summary>
/// Concatenates activities into a single activity. Uses the last activity in the list as the base activity.
/// If any of the activities being process contain an outer SSML speak tag within the value of the Speak property,
/// these are removed from the individual activities and a <speak> tag is wrapped around the resulting
/// concatenated string. An SSML strong break tag is added between activity content. For more infomation
/// about the supported SSML for Alexa see
/// https://developer.amazon.com/en-US/docs/alexa/custom-skills/speech-synthesis-markup-language-ssml-reference.html#break
/// </summary>
/// <param name="activities">The list of one or more outgoing activities</param>
/// <returns>MergedActivityResult</returns>
public MergedActivityResult MergeActivities(IList <Activity> activities)
{
if (activities == null || activities.Count == 0)
{
return(null);
}
var mergedActivityResult = new MergedActivityResult();
bool mergedActivityEndsWithPeriod = false;
bool hasSpeakField = false;
var speakFields = new List <string>();
var textFields = new List <string>();
var attachments = new List <Attachment>();
var endWithPeriod = activities.LastOrDefault(a => !string.IsNullOrEmpty(a.Text))?.Text?.TrimEnd().EndsWith(".") ?? false;
foreach (var activity in activities)
{
if (activity == null)
{
continue;
}
switch (activity.Type)
{
case ActivityTypes.Message:
mergedActivityResult.MergedActivity = activity;
if (!string.IsNullOrEmpty(activity.Speak))
{
hasSpeakField = true;
speakFields.Add(ActivityMappingHelper.StripSpeakTag(activity.Speak));
}
else if (!string.IsNullOrEmpty(activity.Text))
{
speakFields.Add(NormalizeActivityText(activity.TextFormat, activity.Text, forSsml: true));
}
if (!string.IsNullOrEmpty(activity.Text))
{
var text = NormalizeActivityText(activity.TextFormat, activity.Text, forSsml: false);
if (!string.IsNullOrEmpty(text))
{
mergedActivityEndsWithPeriod = activity.Text?.TrimEnd().EndsWith(".") ?? false;
textFields.Add(text.Trim(new char[] { ' ' }));
}
}
if (activity.Attachments != null && activity.Attachments.Count > 0)
{
attachments.AddRange(activity.Attachments);
}
break;
case ActivityTypes.EndOfConversation:
mergedActivityResult.EndOfConversationFlagged = true;
break;
}
}
if (mergedActivityResult.MergedActivity != null)
{
if (hasSpeakField)
{
mergedActivityResult.MergedActivity.Speak = $"<speak>{string.Join("<break strength=\"strong\"/>", speakFields)}</speak>";
}
mergedActivityResult.MergedActivity.Text = string.Join(" ", textFields);
mergedActivityResult.MergedActivity.Attachments = attachments;
if (mergedActivityResult.MergedActivity.Text.EndsWith(".") && !mergedActivityEndsWithPeriod)
{
mergedActivityResult.MergedActivity.Text = mergedActivityResult.MergedActivity.Text.TrimEnd('.');
}
}
return(mergedActivityResult);
}
