static string[] EnsureCorrectNesting(MarkupWriter writer, TagDefinition tagDefinition)
{
if (tagDefinition == null)
{
return new string[] { }
}
;
var injection = new List <string>();
// If we're not allowed to have any parents at all, close them all down
if (tagDefinition.BlockedParents.Union(tagDefinition.BlockedDirectParents).Intersect(TagDefinition.AllTags).Any())
{
while (writer.OpenTags.Count > 0)
{
writer.CloseTag();
}
}
// Keep closing tags until we get out from under any disallowed direct parents
while (
tagDefinition.BlockedDirectParents.Any() &&
writer.OpenTags.Any() &&
tagDefinition.BlockedDirectParents.Contains(writer.OpenTags.Peek()))
{
writer.CloseTag();
}
// If we have to be withing a particular direct parent, keep closing tags until we find one
while (
tagDefinition.RequiredDirectParents.Any() &&
writer.OpenTags.Any() &&
!tagDefinition.RequiredDirectParents.Contains(writer.OpenTags.Peek()))
{
writer.CloseTag();
}
// Keep closing tags until we get out from under any disallowed parents
while (
tagDefinition.BlockedParents.Any() &&
writer.OpenTags.Intersect(tagDefinition.BlockedParents).Any())
{
writer.CloseTag();
}
// If we have to be within a specific parent, inject it
if (tagDefinition.RequiredDirectParents.Any())
{
var directParentInjectionCandidates = (
from dpt in tagDefinition.RequiredDirectParents
where !dpt.Equals(TagDefinition.TagRoot)
select dpt).ToArray();
var haveRequiredDirectParent =
(writer.OpenTags.Count == 0 && tagDefinition.RequiredDirectParents.Contains(TagDefinition.TagRoot)) ||
(writer.OpenTags.Any() && directParentInjectionCandidates.Contains(writer.OpenTags.First()));
if (!haveRequiredDirectParent)
{
var injectionTag = writer.GetTagDefinition(directParentInjectionCandidates.First());
InjectParent(writer, injection, injectionTag);
}
}
if (tagDefinition.RequiredParents.Any())
{
var haveRequiredParent = writer.OpenTags.Intersect(tagDefinition.RequiredParents).Any();
if (!haveRequiredParent)
{
var injectionTag = writer.GetTagDefinition(tagDefinition.RequiredParents.First());
InjectParent(writer, injection, injectionTag);
}
}
// If any injection has occurred, record the tag that caused it so we can collapse it later
if (injection.Any())
{
injection.Insert(0, tagDefinition.TagName);
}
return(injection.Distinct().ToArray());
}
private static void InjectParent(MarkupWriter writer, List <string> injection, TagDefinition injectionTag)
{
injection.Add(injectionTag.TagName);
injection.AddRange(EnsureCorrectNesting(writer, injectionTag));
writer.OpenTag(injectionTag, null);
}
