protected IList <IInlineElement> ProcessInlineElements(string block, InlineElementType elementType = InlineElementType.All)
{
var elements = new List <IInlineElement>();
if (string.IsNullOrWhiteSpace(block))
{
return(elements);
}
var matches = new List <InlineElementRuleMatch>();
foreach (var rule in PatternMatcher.InlineElementRules.Where(r => elementType.HasFlag(r.ElementType)))
{
if (rule.Regex.IsMatch(block))
{
var currentRule = rule;
var outerMatches = matches;
block = currentRule.Regex.Replace(block, match =>
{
switch (currentRule.ElementType)
{
case InlineElementType.Emphasis:
case InlineElementType.EmphasisDouble:
var emphasis = CreateInlineElement <Emphasis>(match, currentRule.Constraint);
if (currentRule.ElementType == InlineElementType.EmphasisDouble)
{
emphasis.Element.DoubleDelimited = true;
}
outerMatches.Add(emphasis);
break;
case InlineElementType.Strong:
case InlineElementType.StrongDouble:
var strong = CreateContainerInlineElement <Strong>(match, currentRule.Constraint);
if (currentRule.ElementType == InlineElementType.StrongDouble)
{
strong.Element.DoubleDelimited = true;
}
outerMatches.Add(strong);
break;
case InlineElementType.Monospace:
case InlineElementType.MonospaceDouble:
var monospace = CreateContainerInlineElement <Monospace>(match, currentRule.Constraint);
if (currentRule.ElementType == InlineElementType.MonospaceDouble)
{
monospace.Element.DoubleDelimited = true;
}
outerMatches.Add(monospace);
break;
case InlineElementType.Subscript:
var subscript = CreateInlineElement <Subscript>(match, currentRule.Constraint);
outerMatches.Add(subscript);
break;
case InlineElementType.Superscript:
var superscript = CreateInlineElement <Superscript>(match, currentRule.Constraint);
outerMatches.Add(superscript);
break;
case InlineElementType.Quotation:
case InlineElementType.QuotationDouble:
var quotation = CreateContainerInlineElement <QuotationMark>(match, currentRule.Constraint);
if (currentRule.ElementType == InlineElementType.QuotationDouble)
{
quotation.Element.DoubleDelimited = true;
}
outerMatches.Add(quotation);
break;
case InlineElementType.Mark:
case InlineElementType.MarkDouble:
var mark = CreateContainerInlineElement <Mark>(match, currentRule.Constraint);
if (currentRule.ElementType == InlineElementType.MarkDouble)
{
mark.Element.DoubleDelimited = true;
}
outerMatches.Add(mark);
break;
case InlineElementType.InternalAnchor:
var internalAnchorParts = match.Groups[1].Value;
InternalAnchor anchor;
if (internalAnchorParts.IndexOf(",", StringComparison.OrdinalIgnoreCase) > -1)
{
var parts = internalAnchorParts.Split(',');
// TODO: Process inline elements of parts[1]
anchor = new InternalAnchor(parts[0], parts[1]);
}
else
{
anchor = new InternalAnchor(internalAnchorParts);
}
outerMatches.Add(new InlineElementRuleMatch(anchor, match.Index, match.Index + match.Length, new string(' ', match.Length)));
break;
case InlineElementType.InlineAnchor:
var inlineAnchorId = match.Groups[1].Value;
var xRefLabel = match.Groups[2].Value;
// TODO: process inline elements of xRefLabel
var inlineAnchor = !string.IsNullOrEmpty(xRefLabel)
? new InlineAnchor(inlineAnchorId, xRefLabel)
: new InlineAnchor(inlineAnchorId);
outerMatches.Add(new InlineElementRuleMatch(inlineAnchor, match.Index, match.Index + match.Length, new string(' ', match.Length)));
break;
case InlineElementType.AttributeReference:
var text = match.Groups[2].Value;
var attributeReference = new AttributeReference(text);
outerMatches.Add(new InlineElementRuleMatch(attributeReference, match.Index, match.Index + match.Length, new string(' ', match.Length)));
break;
case InlineElementType.ImplicitLink:
// TODO: split attributes out
var attributes = match.Groups["attributes"].Success
? match.Groups["attributes"].Value
: null;
var href = match.Groups["href"].Value;
var link = new Link(href, attributes);
outerMatches.Add(new InlineElementRuleMatch(link, match.Index + match.Groups[1].Length, match.Index + match.Length, match.Groups[1].Value + new string(' ', match.Length - match.Groups[1].Length)));
break;
}
// replace any matches with the match replacement value TODO: This could be optimized
return(outerMatches[outerMatches.Count - 1].Replacement);
});
}
}
if (matches.Any())
{
matches.Sort((match1, match2) => match1.StartIndex.CompareTo(match2.StartIndex));
for (int i = 0; i < matches.Count; i++)
{
var match = matches[i];
var isLastMatch = i == matches.Count - 1;
if (i == 0 && match.StartIndex > 0)
{
elements.Add(new TextLiteral(block.Substring(0, matches[0].StartIndex)));
}
elements.Add(match.Element);
if (!isLastMatch)
{
// is there a literal between where this match ends and next one begins
var nextMatch = matches[i + 1];
var length = nextMatch.StartIndex - match.EndIndex;
if (length > 0)
{
elements.Add(new TextLiteral(block.Substring(match.EndIndex, length)));
}
}
else
{
if (match.EndIndex < block.Length)
{
elements.Add(new TextLiteral(block.Substring(match.EndIndex)));
}
}
}
}
else
{
elements.Add(new TextLiteral(block));
}
return(elements);
}