public static void AppendStackEntry(InlineStack entry, Subject subj)
{
if (subj.LastPendingInline != null)
{
entry.Previous = subj.LastPendingInline;
subj.LastPendingInline.Next = entry;
}
if (subj.FirstPendingInline is null)
{
subj.FirstPendingInline = entry;
}
subj.LastPendingInline = entry;
}
public static InlineStack FindMatchingOpener(InlineStack searchBackwardsFrom, InlineStackPriority priority,
char delimiter, int closerDelimiterCount, bool closerCanOpen, out bool canClose)
{
canClose = true;
var istack = searchBackwardsFrom;
while (true)
{
if (istack is null)
{
// this cannot be a closer since there is no opener available.
canClose = false;
return(null);
}
if (istack.Priority > priority ||
(istack.Delimiter == delimiter && 0 != (istack.Flags & InlineStackFlags.Closer)))
{
// there might be a closer further back but we cannot go there yet because a higher priority element is blocking
// the other option is that the stack entry could be a closer for the same char - this means
// that any opener we might find would first have to be matched against this closer.
return(null);
}
if (istack.Delimiter == delimiter)
{
// interior closer of size 2 does not match opener of size 1 and vice versa.
// for more details, see https://github.com/jgm/cmark/commit/c50197bab81d7105c9c790548821b61bcb97a62a
var oddMatch = (closerCanOpen || (istack.Flags & InlineStackFlags.CloserOriginally) > 0) &&
istack.DelimiterCount != closerDelimiterCount &&
((istack.DelimiterCount + closerDelimiterCount) % 3 == 0);
if (!oddMatch)
{
return(istack);
}
}
istack = istack.Previous;
}
}
public static void PostProcessInlineStack(Subject subj, InlineStack first, InlineStack last, InlineStackPriority ignorePriority)
{
while (ignorePriority > 0)
{
var istack = first;
while (istack != null)
{
if (istack.Priority >= ignorePriority)
{
RemoveStackEntry(istack, subj, istack);
}
else if (0 != (istack.Flags & InlineStackFlags.Closer))
{
var iopener = FindMatchingOpener(istack.Previous, istack.Priority, istack.Delimiter, istack.DelimiterCount, (istack.Flags & InlineStackFlags.Opener) > 0, out bool canClose);
if (iopener != null)
{
bool retry = false;
if (iopener.Delimiter == '~')
{
InlineMethods.MatchInlineStack(iopener, subj, istack.DelimiterCount, istack, (InlineTag)0, InlineTag.Strikethrough);
if (istack.DelimiterCount > 1)
{
retry = true;
}
}
else
{
var useDelims = InlineMethods.MatchInlineStack(iopener, subj, istack.DelimiterCount, istack, InlineTag.Emphasis, InlineTag.Strong);
if (istack.DelimiterCount > 0)
{
retry = true;
}
}
if (retry)
{
// remove everything between opened and closer (not inclusive).
if (istack.Previous != null && iopener.Next != istack.Previous)
{
RemoveStackEntry(iopener.Next, subj, istack.Previous);
}
continue;
}
else
{
// remove opener, everything in between, and the closer
RemoveStackEntry(iopener, subj, istack);
}
}
else if (!canClose)
{
// this case means that a matching opener does not exist
// remove the Closer flag so that a future Opener can be matched against it.
istack.Flags &= ~InlineStackFlags.Closer;
}
}
if (istack == last)
{
break;
}
istack = istack.Next;
}
ignorePriority--;
}
}
/// <summary>
/// Removes a subset of the stack.
/// </summary>
/// <param name="first">The first entry to be removed.</param>
/// <param name="subj">The subject associated with this stack. Can be <see langword="null"/> if the pointers in the subject should not be updated.</param>
/// <param name="last">The last entry to be removed. Can be <see langword="null"/> if everything starting from <paramref name="first"/> has to be removed.</param>
public static void RemoveStackEntry(InlineStack first, Subject subj, InlineStack last)
{
var curPriority = first.Priority;
if (last is null)
{
if (first.Previous != null)
{
first.Previous.Next = null;
}
else if (subj != null)
{
subj.FirstPendingInline = null;
}
if (subj != null)
{
last = subj.LastPendingInline;
subj.LastPendingInline = first.Previous;
}
first = first.Next;
}
else
{
if (first.Previous != null)
{
first.Previous.Next = last.Next;
}
else if (subj != null)
{
subj.FirstPendingInline = last.Next;
}
if (last.Next != null)
{
last.Next.Previous = first.Previous;
}
else if (subj != null)
{
subj.LastPendingInline = first.Previous;
}
if (first == last)
{
return;
}
first = first.Next;
last = last.Previous;
}
if (last is null || first is null)
{
return;
}
first.Previous = null;
last.Next = null;
// handle case like [*b*] (the whole [..] is being removed but the inner *..* must still be matched).
// this is not done automatically because the initial * is recognized as a potential closer (assuming
// potential scenario '*[*' ).
if (curPriority > 0)
{
PostProcessInlineStack(null, first, last, curPriority);
}
}