private void ProcessLine(ParserContext context)
{
var groups = new string[0];
var subject = new Subject(context.Line);
context.Container = context.Document;
while (context.Container.LastChild != null && context.Container.LastChild.IsOpen)
{
context.Container = context.Container.LastChild;
if (!context.Container.MatchNextLine(subject))
{
context.Container = context.Container.Parent; // back up to last matching block
break;
}
}
var lastMatchedContainer = context.Container;
// This function is used to finalize and close any unmatched
// blocks. We aren't ready to do this now, because we might
// have a lazy paragraph continuation, in which case we don't
// want to close unmatched blocks. So we store this closure for
// use later, when we have more information.
var oldtip = context.Tip;
context.CloseUnmatchedBlocks = () =>
{
// finalize any blocks not matched
while (oldtip != lastMatchedContainer)
{
oldtip.Close(context);
oldtip = oldtip.Parent;
}
context.CloseUnmatchedBlocks = () => { };
};
// Check to see if we've hit 2nd blank line; if so break out of list:
if (subject.IsBlank && context.Container.LastLineIsBlank)
{
BreakOutOfLists(context, context.Container, context.LineNumber);
}
// Unless last matched context.Container is a code block, try new context.Container starts,
// adding children to the last matched context.Container:
while (!context.Container.IsCode && !context.BlocksParsed)
{
var parsed = context.Parsers.IndentedCodeParser.Parse(context, subject);
parsed = parsed || context.Parsers.LazyParagraphContinuationParser.Parse(context, subject);
parsed = parsed || context.Parsers.BlockQuoteParser.Parse(context, subject);
parsed = parsed || context.Parsers.ATXHeaderParser.Parse(context, subject);
parsed = parsed || context.Parsers.FencedCodeParser.Parse(context, subject);
parsed = parsed || context.Parsers.HtmlBlockParser.Parse(context, subject);
parsed = parsed || context.Parsers.SetExtHeaderParser.Parse(context, subject);
parsed = parsed || context.Parsers.HorizontalRuleParser.Parse(context, subject);
parsed = parsed || context.Parsers.ListParser.Parse(context, subject);
if (!parsed || context.Container.AcceptsLines)
{
// if none were found or it's a line context.Container, it can't contain other containers
context.BlocksParsed = true;
}
}
// What remains at the offset is a text line. Add the text to the
// appropriate context.Container.
// First check for a lazy paragraph continuation:
if (context.Tip != lastMatchedContainer && !subject.IsBlank &&
context.Tip is Paragraph && context.Tip.Strings.Any())
{
// lazy paragraph continuation
//context.Tip.LastLineIsBlank = false;
context.Tip.AddLine(subject.Rest);
}
else
{
// not a lazy continuation
// finalize any blocks not matched
context.CloseUnmatchedBlocks();
// Block quote lines are never blank as they start with >
// and we don't count blanks in fenced code for purposes of tight/loose
// lists or breaking out of lists. We also don't set last_line_blank
// on an empty list item.
if (!subject.IsBlank || context.Container is BlockQuote || context.Container is FencedCode)
{
context.Container.LastLineIsBlank = false;
}
else if (context.Container is ListItem)
{
context.Container.LastLineIsBlank = context.Container.StartLine < context.LineNumber;
}
else
{
context.Container.LastLineIsBlank = true;
}
var cont = context.Container;
while (cont.Parent is Block)
{
cont.Parent.LastLineIsBlank = false;
cont = cont.Parent;
}
if (context.Container is IndentedCode || context.Container is HtmlBlock)
{
context.Tip.AddLine(subject.Rest);
}
else if (context.Container is FencedCode)
{
var fencedCode = context.Container as FencedCode;
var saved = subject.Save();
// check for closing code fence:
var match = subject.Indent <= 3;
subject.AdvanceWhile(c => c == ' ');
match = match &&
subject.Char == fencedCode.Char &&
subject.AdvanceWhile(c => c == fencedCode.Char) >= fencedCode.Length;
subject.AdvanceWhile(c => c == ' ');
if (match && subject.EndOfString)
{
// don't add closing fence to context.Container; instead, close it:
context.Container.Close(context);
}
else
{
saved.Restore();
context.Tip.AddLine(subject.Rest);
}
}
else if (context.Container is ATXHeader || context.Container is SetExtHeader || context.Container is HorizontalRule)
{
// nothing to do; we already added the contents.
}
else
{
if (context.Container.AcceptsLines)
{
subject.AdvanceToFirstNonSpace();
context.Tip.AddLine(subject.Rest);
}
else if (subject.IsBlank)
{
// do nothing
}
else if (!(context.Container is HorizontalRule || context.Container is SetExtHeader))
{
// create paragraph context.Container for line
context.AddBlock(new Paragraph());
subject.AdvanceToFirstNonSpace();
context.Tip.AddLine(subject.Rest);
}
else
{
throw new Exception(
"Line " + context.LineNumber.ToString() +
" with context.Container type " + context.Container.GetType().Name +
" did not match any condition."
);
}
}
}
}
public SavedSubject(Subject subject)
{
_subject = subject;
_index = _subject.Index;
_char = subject.Char;
_endOfString = subject.EndOfString;
}
public SavedSubject(Subject subject)
{
_subject = subject;
_index = _subject._index;
}