private MarkdownParsingResult <INode> ParseFormatModificator(ITokenizer <IMdToken> tokenizer,
Md modificatorAttribute)
{
var boundedTokenizer = tokenizer.UntilNotMatch(token => token.Has(Md.Close, modificatorAttribute));
var open = boundedTokenizer.Match(token => token.Has(Md.Open, modificatorAttribute));
var children = open.IfSuccess(
childrenTokenizer => ParseNodesUntilMatch(childrenTokenizer,
t => ParseTextWithEscaped(t)
.IfFail(ParseFormatModificator)
.IfFail(ParseAnyTokenAsText))
);
var close = children.IfSuccess(t => t.UnboundTokenizer()
.Match(token => token.Has(Md.Close, modificatorAttribute))
);
if (close.Succeed && close.Parsed.Text == open.Parsed.Text)
{
var node = CreateModificatorNode(modificatorAttribute, children.Parsed);
return(close.Remainder.SuccessWith(node));
}
return(tokenizer.Fail <INode>());
}
private MarkdownParsingResult <INode> ParseCodeIndented(ITokenizer <IMdToken> tokenizer)
{
var codeLines = ParseNodesUntilMatch(tokenizer, t =>
{
var start = t.Match(token => token.Has(Md.Indent));
var codeLine = start.IfSuccess(inner =>
{
var bounded = inner.UntilNotMatch(token => token.Has(Md.NewLine));
return(ParseNodesUntilMatch(bounded, ParseAnyTokenAsEscaped));
});
if (codeLine.Succeed)
{
var codeNodes = codeLine.Parsed;
var newLine = codeLine.Remainder.UnboundTokenizer().Match(token => token.Has(Md.NewLine));
if (newLine.Succeed)
{
codeNodes.Add(new EscapedTextNode(newLine.Parsed.Text));
}
return(newLine.Remainder.SuccessWith(codeNodes));
}
return(t.Fail <List <INode> >());
});
if (!codeLines.Parsed.Any())
{
return(tokenizer.Fail <INode>());
}
var unpackedText = codeLines.Parsed.SelectMany(node => node);
return(codeLines.Remainder.SuccessWith <INode>(new CodeModificatorNode(unpackedText)));
}
private MarkdownParsingResult <INode> ParseAnyTokenAsText(ITokenizer <IMdToken> tokenizer)
{
if (tokenizer.AtEnd)
{
return(tokenizer.Fail <INode>());
}
return(tokenizer.Advance().SuccessWith <INode>(new TextNode(tokenizer.CurrentToken.Text)));
}
public static MarkdownParsingResult <IMdToken> Match(this ITokenizer <IMdToken> tokenizer,
Predicate <IMdToken> predicate)
{
if (tokenizer.AtEnd || !predicate(tokenizer.CurrentToken))
{
return(tokenizer.Fail <IMdToken>());
}
return(tokenizer.Advance().SuccessWith(tokenizer.CurrentToken));
}
public MarkdownParsingResult <INode> ParseParagraph(ITokenizer <IMdToken> tokenizer)
{
var children = ParseNodesUntilMatch(tokenizer, ParseFormattedText);
if (children.Parsed.Any())
{
return(children.Remainder.SuccessWith <INode>(new ParagraphNode(children.Parsed)));
}
return(tokenizer.Fail <INode>());
}
private MarkdownParsingResult <INode> ParseEscaped(ITokenizer <IMdToken> tokenizer)
{
var tokens = tokenizer.Match(token => token.Has(Md.Escaped));
if (tokens.Succeed)
{
return(tokens.Remainder.SuccessWith <INode>(new EscapedTextNode(tokens.Parsed.Text)));
}
return(tokenizer.Fail <INode>());
}
private MarkdownParsingResult <INode> ParseAnyTokenAsEscaped(ITokenizer <IMdToken> tokenizer)
{
if (tokenizer.AtEnd)
{
return(tokenizer.Fail <INode>());
}
var underlyingText = tokenizer.CurrentToken.UnderlyingText;
return(tokenizer.Advance().SuccessWith <INode>(new EscapedTextNode(underlyingText)));
}
private MarkdownParsingResult <INode> ParsePlainText(ITokenizer <IMdToken> tokenizer)
{
var tokens = tokenizer.UntilMatch(token => token.Has(Md.PlainText));
var text = string.Join("", tokens.Parsed.Select(t => t.Text));
if (tokens.Parsed.Any())
{
return(tokens.Remainder.SuccessWith <INode>(new TextNode(text)));
}
return(tokenizer.Fail <INode>());
}
private MarkdownParsingResult <INode> ParseTextWithEscaped(ITokenizer <IMdToken> tokenizer)
{
var parsingResult = ParseNodesUntilMatch(tokenizer, t => ParsePlainText(t).IfFail(ParseEscaped));
var nodes = parsingResult.Parsed;
if (!nodes.Any())
{
return(tokenizer.Fail <INode>());
}
// No need to create extra nodes if we can
INode result = nodes.Count == 1 ? nodes[0] : new GroupNode(nodes);
return(parsingResult.Remainder.SuccessWith(result));
}
private MarkdownParsingResult <INode> ParseCodeInBackticks(ITokenizer <IMdToken> tokenizer)
{
var boundedTokenizer = tokenizer.UntilNotMatch(token => token.Has(Md.Close, Md.Code));
var open = boundedTokenizer.Match(token => token.Has(Md.Open, Md.Code));
var children =
open.IfSuccess(childrenTokenizer => ParseNodesUntilMatch(childrenTokenizer, ParseAnyTokenAsEscaped));
var close = children.IfSuccess(t => t.UnboundTokenizer()
.Match(token => token.Has(Md.Close, Md.Code)));
if (close.Succeed)
{
return(close.Remainder.SuccessWith <INode>(new CodeModificatorNode(children.Parsed)));
}
return(tokenizer.Fail <INode>());
}
private MarkdownParsingResult <INode> ParseHeader(ITokenizer <IMdToken> tokenizer)
{
var header = tokenizer.Match(token => token.Has(Md.Header));
var boundedTokenizer = header.IfSuccess(t =>
{
var bounded = t.UntilNotMatch(token => token.HasAny(Md.NewLine, Md.Break));
return(SkipWhiteSpaces(bounded));
});
var headerContent = boundedTokenizer.IfSuccess(t => ParseNodesUntilMatch(t, ParseFormattedText));
if (headerContent.Succeed)
{
return(headerContent.Remainder.UnboundTokenizer().SuccessWith <INode>(
new HeaderNode(header.Parsed.Text.Length, headerContent.Parsed)
));
}
return(tokenizer.Fail <INode>());
}
private MarkdownParsingResult <INode> ParseLink(ITokenizer <IMdToken> tokenizer)
{
var openText = tokenizer.Match(token => token.Has(Md.LinkText, Md.Open));
var text = openText.IfSuccess(ParseTextWithEscaped);
var closeText = text.IfSuccess(t => t.Match(token => token.Has(Md.LinkText, Md.Close)));
var openLink = closeText
.IfSuccess(SkipWhiteSpaces)
.IfSuccess(t => t.Match(token => token.Has(Md.LinkReference, Md.Open)));
var link = openLink.IfSuccess(ParsePlainText);
var closeLink = link.IfSuccess(t => t.Match(token => token.Has(Md.LinkReference, Md.Close)));
if (closeLink.Succeed)
{
var linkText = ((TextNode)link.Parsed).Text;
return(closeLink.Remainder.SuccessWith <INode>(new LinkNode(linkText, text.Parsed)));
}
return(tokenizer.Fail <INode>());
}