internal static void MatchSquareBracketStack(InlineStack opener, Subject subj, Reference details)
{
if (details != null)
{
var inl = opener.StartingInline;
var isImage = 0 != (opener.Flags & InlineStack.InlineStackFlags.ImageLink);
inl.Tag = isImage ? InlineTag.Image : InlineTag.Link;
inl.FirstChild = inl.NextSibling;
inl.NextSibling = null;
inl.SourceLastPosition = subj.Position;
inl.TargetUrl = details.Url;
inl.LiteralContent = details.Title;
if (!isImage)
{
// since there cannot be nested links, remove any other link openers before this
var temp = opener.Previous;
while (temp != null && temp.Priority <= InlineStack.InlineStackPriority.Links)
{
if (temp.Delimeter == '[' && temp.Flags == opener.Flags)
{
// mark the previous entries as "inactive"
if (temp.DelimeterCount == -1)
{
break;
}
temp.DelimeterCount = -1;
}
temp = temp.Previous;
}
}
InlineStack.RemoveStackEntry(opener, subj, null);
if (subj != null)
{
subj.LastInline = inl;
}
}
else
{
// this looked like a link, but was not.
// remove the opener stack entry but leave the inbetween intact
InlineStack.RemoveStackEntry(opener, subj, opener);
var inl = new Inline("]", subj.Position - 1, subj.Position);
subj.LastInline.LastSibling.NextSibling = inl;
subj.LastInline = inl;
}
}
private static Inline HandleRightSquareBracket(Subject subj)
{
// move past ']'
subj.Position++;
bool canClose;
var istack = InlineStack.FindMatchingOpener(subj.LastPendingInline, InlineStack.InlineStackPriority.Links, '[', out canClose);
if (istack != null)
{
// if the opener is "inactive" then it means that there was a nested link
if (istack.DelimeterCount == -1)
{
InlineStack.RemoveStackEntry(istack, subj, istack);
return(new Inline("]", subj.Position - 1, subj.Position));
}
var endpos = subj.Position;
// try parsing details for '[foo](/url "title")' or '[foo][bar]'
var details = ParseLinkDetails(subj);
// try lookup of the brackets themselves
if (details == null || details == Reference.SelfReference)
{
var startpos = istack.StartPosition;
var label = new StringPart(subj.Buffer, startpos, endpos - startpos - 1);
details = LookupReference(subj.ReferenceMap, label);
}
if (details == Reference.InvalidReference)
{
details = null;
}
MatchSquareBracketStack(istack, subj, details);
return(null);
}
var inlText = new Inline("]", subj.Position - 1, subj.Position);
if (canClose)
{
// note that the current implementation will not work if there are other inlines with priority
// higher than Links.
// to fix this the parsed link details should be added to the closer element in the stack.
throw new NotSupportedException("It is not supported to have inline stack priority higher than Links.");
////istack = new InlineStack();
////istack.Delimeter = '[';
////istack.StartingInline = inlText;
////istack.StartPosition = subj.Position;
////istack.Priority = InlineStack.InlineStackPriority.Links;
////istack.Flags = InlineStack.InlineStackFlags.Closer;
////InlineStack.AppendStackEntry(istack, subj);
}
return(inlText);
}
internal static int MatchInlineStack(InlineStack opener, Subject subj, int closingDelimeterCount, InlineStack closer, InlineTag?singleCharTag, InlineTag?doubleCharTag)
{
// calculate the actual number of delimeters used from this closer
int useDelims;
var openerDelims = opener.DelimeterCount;
if (closingDelimeterCount < 3 || openerDelims < 3)
{
useDelims = closingDelimeterCount <= openerDelims ? closingDelimeterCount : openerDelims;
if (useDelims == 1 && singleCharTag == null)
{
return(0);
}
}
else if (singleCharTag == null)
{
useDelims = 2;
}
else if (doubleCharTag == null)
{
useDelims = 1;
}
else
{
useDelims = closingDelimeterCount % 2 == 0 ? 2 : 1;
}
Inline inl = opener.StartingInline;
if (openerDelims == useDelims)
{
// the opener is completely used up - remove the stack entry and reuse the inline element
inl.Tag = useDelims == 1 ? singleCharTag.Value : doubleCharTag.Value;
inl.LiteralContent = null;
inl.FirstChild = inl.NextSibling;
inl.NextSibling = null;
InlineStack.RemoveStackEntry(opener, subj, closer.Previous);
}
else
{
// the opener will only partially be used - stack entry remains (truncated) and a new inline is added.
opener.DelimeterCount -= useDelims;
inl.LiteralContent = inl.LiteralContent.Substring(0, opener.DelimeterCount);
inl.SourceLastPosition -= useDelims;
inl.NextSibling = new Inline(useDelims == 1 ? singleCharTag.Value : doubleCharTag.Value, inl.NextSibling);
inl = inl.NextSibling;
inl.SourcePosition = opener.StartingInline.SourcePosition + opener.DelimeterCount;
}
// there are two callers for this method, distinguished by the `closer` argument.
// if closer == null it means the method is called during the initial subject parsing and the closer
// characters are at the current position in the subject. The main benefit is that there is nothing
// parsed that is located after the matched inline element.
// if closer != null it means the method is called when the second pass for previously unmatched
// stack elements is done. The drawback is that there can be other elements after the closer.
if (closer != null)
{
var clInl = closer.StartingInline;
if ((closer.DelimeterCount -= useDelims) > 0)
{
// a new inline element must be created because the old one has to be the one that
// finalizes the children of the emphasis
var newCloserInline = new Inline(clInl.LiteralContent.Substring(useDelims));
newCloserInline.SourcePosition = inl.SourceLastPosition = clInl.SourcePosition + useDelims;
newCloserInline.SourceLength = closer.DelimeterCount;
newCloserInline.NextSibling = clInl.NextSibling;
clInl.LiteralContent = null;
clInl.NextSibling = null;
inl.NextSibling = closer.StartingInline = newCloserInline;
}
else
{
inl.SourceLastPosition = clInl.SourceLastPosition;
clInl.LiteralContent = null;
inl.NextSibling = clInl.NextSibling;
clInl.NextSibling = null;
}
}
else if (subj != null)
{
inl.SourceLastPosition = subj.Position - closingDelimeterCount + useDelims;
subj.LastInline = inl;
}
return(useDelims);
}
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)
{
InlineStack.RemoveStackEntry(istack, subj, istack);
}
else if (0 != (istack.Flags & InlineStackFlags.Closer))
{
bool canClose;
var iopener = InlineStack.FindMatchingOpener(istack.Previous, istack.Priority, istack.Delimeter, out canClose);
if (iopener != null)
{
bool retry = false;
if (iopener.Delimeter == '~')
{
InlineMethods.MatchInlineStack(iopener, subj, istack.DelimeterCount, istack, null, InlineTag.Strikethrough);
if (istack.DelimeterCount > 1)
{
retry = true;
}
}
else
{
var useDelims = InlineMethods.MatchInlineStack(iopener, subj, istack.DelimeterCount, istack, InlineTag.Emphasis, InlineTag.Strong);
if (istack.DelimeterCount > 0)
{
retry = true;
}
}
if (retry)
{
// remove everything between opened and closer (not inclusive).
if (iopener.Next != istack.Previous)
{
InlineStack.RemoveStackEntry(iopener.Next, subj, istack.Previous);
}
continue;
}
else
{
// remove opener, everything in between, and the closer
InlineStack.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--;
}
}