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@ -24,13 +24,13 @@ internal static partial class MarkdownParser
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/* Formatting */
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private static readonly IMatcher<MarkdownNode> BoldFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest double asterisk not followed by an asterisk.
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// There must be exactly two closing asterisks.
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new Regex(@"\*\*(.+?)\*\*(?!\*)", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Bold, Parse(s.Relocate(m.Groups[1])))
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);
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private static readonly IMatcher<MarkdownNode> ItalicFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest single asterisk not preceded or followed by an asterisk.
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// There must be exactly one closing asterisk.
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// Opening asterisk must not be followed by whitespace.
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// Closing asterisk must not be preceded by whitespace.
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new Regex(@"\*(?!\s)(.+?)(?<!\s|\*)\*(?!\*)", DefaultRegexOptions | RegexOptions.Singleline),
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@ -38,27 +38,26 @@ internal static partial class MarkdownParser
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);
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private static readonly IMatcher<MarkdownNode> ItalicBoldFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest triple asterisk not followed by an asterisk.
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// There must be exactly three closing asterisks.
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new Regex(@"\*(\*\*.+?\*\*)\*(?!\*)", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Italic, Parse(s.Relocate(m.Groups[1]), BoldFormattingNodeMatcher))
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);
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private static readonly IMatcher<MarkdownNode> ItalicAltFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character except underscore until an underscore.
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// Closing underscore must not be followed by a word character.
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new Regex(@"_([^_]+)_(?!\w)", DefaultRegexOptions | RegexOptions.Singleline),
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new Regex(@"_(.+?)_(?!\w)", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Italic, Parse(s.Relocate(m.Groups[1])))
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);
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private static readonly IMatcher<MarkdownNode> UnderlineFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest double underscore not followed by an underscore.
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// There must be exactly two closing underscores.
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new Regex(@"__(.+?)__(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Underline, Parse(s.Relocate(m.Groups[1])))
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);
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private static readonly IMatcher<MarkdownNode> ItalicUnderlineFormattingNodeMatcher =
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new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest triple underscore not followed by an underscore.
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// There must be exactly three closing underscores.
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new Regex(@"_(__.+?__)_(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(
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FormattingKind.Italic,
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@ -67,68 +66,61 @@ internal static partial class MarkdownParser
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);
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private static readonly IMatcher<MarkdownNode> StrikethroughFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest double tilde.
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new Regex(@"~~(.+?)~~", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Strikethrough, Parse(s.Relocate(m.Groups[1])))
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);
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private static readonly IMatcher<MarkdownNode> SpoilerFormattingNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the earliest double pipe.
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new Regex(@"\|\|(.+?)\|\|", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Spoiler, Parse(s.Relocate(m.Groups[1])))
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);
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private static readonly IMatcher<MarkdownNode> SingleLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the end of the line.
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// Opening 'greater than' character must be followed by whitespace.
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// Consume the newline character so that it's not included in the content.
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// Include the linebreak in the content so that the lines are preserved in quotes.
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new Regex(@"^>\s(.+\n?)", DefaultRegexOptions),
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(s, m) => new FormattingNode(FormattingKind.Quote, Parse(s.Relocate(m.Groups[1])))
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);
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private static readonly IMatcher<MarkdownNode> RepeatedSingleLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Repeatedly capture any character until the end of the line.
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// Consume the newline character so that it's not included in the content.
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// Include the linebreaks in the content, so that the lines are preserved in quotes.
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new Regex(@"(?:^>\s(.+\n?)){2,}", DefaultRegexOptions),
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(_, m) => new FormattingNode(
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(s, m) => new FormattingNode(
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FormattingKind.Quote,
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Parse(
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// Combine all captures into a single string
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string.Concat(m.Groups[1].Captures.Select(c => c.Value))
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)
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m.Groups[1].Captures.SelectMany(c => Parse(s.Relocate(c))).ToArray()
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)
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);
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private static readonly IMatcher<MarkdownNode> MultiLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the end of the input.
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// Opening 'greater than' characters must be followed by whitespace.
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new Regex(@"^>>>\s(.+)", DefaultRegexOptions | RegexOptions.Singleline),
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(s, m) => new FormattingNode(FormattingKind.Quote, Parse(s.Relocate(m.Groups[1])))
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);
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/* Headers */
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private static readonly IMatcher<MarkdownNode> HeaderNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character until the end of the line.
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// Opening 'hash' character(s) must be followed by whitespace.
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// Consume the newline character so that it's not included in the content.
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new Regex(@"^(\#{1,3})\s(.+\n?)", DefaultRegexOptions),
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// Consume the linebreak so that it's not attached to following nodes.
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new Regex(@"^(\#{1,3})\s(.+)\n", DefaultRegexOptions),
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(s, m) => new HeaderNode(m.Groups[1].Length, Parse(s.Relocate(m.Groups[2])))
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);
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private static readonly IMatcher<MarkdownNode> ListNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Can be preceded by whitespace, which specifies the list's nesting level.
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// Following lines that start with (level+1) whitespace are considered part of the list item.
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// Consume the linebreak so that it's not attached to following nodes.
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new Regex(@"^(\s*)(?:[\-\*]\s(.+(?:\n\s\1.*)*)?\n?)+", DefaultRegexOptions),
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(s, m) => new ListNode(
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m.Groups[2].Captures.Select(c => new ListItemNode(Parse(s.Relocate(c)))).ToArray()
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)
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);
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/* Code blocks */
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private static readonly IMatcher<MarkdownNode> InlineCodeBlockNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any character except backtick until a backtick.
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// Blank lines at the beginning and at the end of content are trimmed.
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// There can be either one or two backticks, but equal number on both sides.
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// One or two backticks are allowed, but they must match on both sides.
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new Regex(@"(`{1,2})([^`]+)\1", DefaultRegexOptions | RegexOptions.Singleline),
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(_, m) => new InlineCodeBlockNode(m.Groups[2].Value.Trim('\r', '\n'))
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(_, m) => new InlineCodeBlockNode(m.Groups[2].Value)
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);
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private static readonly IMatcher<MarkdownNode> MultiLineCodeBlockNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture language identifier and then any character until the earliest triple backtick.
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// Language identifier is one word immediately after opening backticks, followed immediately by newline.
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// Language identifier is one word immediately after opening backticks, followed immediately by a linebreak.
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// Blank lines at the beginning and at the end of content are trimmed.
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new Regex(@"```(?:(\w*)\n)?(.+?)```", DefaultRegexOptions | RegexOptions.Singleline),
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(_, m) => new MultiLineCodeBlockNode(m.Groups[1].Value, m.Groups[2].Value.Trim('\r', '\n'))
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@ -215,7 +207,7 @@ internal static partial class MarkdownParser
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);
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private static readonly IMatcher<MarkdownNode> CodedStandardEmojiNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture :thinking: for known emoji codes
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// Capture :thinking:
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new Regex(@":([\w_]+):", DefaultRegexOptions),
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(_, m) => EmojiIndex.TryGetName(m.Groups[1].Value)?.Pipe(n => new EmojiNode(n))
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);
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@ -233,8 +225,8 @@ internal static partial class MarkdownParser
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/* Links */
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private static readonly IMatcher<MarkdownNode> AutoLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
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// Capture any non-whitespace character after http:// or https://
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// until the last punctuation character or whitespace
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// Any non-whitespace character after http:// or https://
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// until the last punctuation character or whitespace.
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new Regex(@"(https?://\S*[^\.,:;""'\s])", DefaultRegexOptions),
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(_, m) => new LinkNode(m.Groups[1].Value)
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);
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@ -318,8 +310,7 @@ internal static partial class MarkdownParser
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}
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);
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// Combine all matchers into one.
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// Matchers that have similar patterns are ordered from most specific to least specific.
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// Matchers that have similar patterns are ordered from most specific to least specific
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private static readonly IMatcher<MarkdownNode> NodeMatcher = new AggregateMatcher<MarkdownNode>(
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// Escaped text
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ShrugTextNodeMatcher,
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@ -339,9 +330,8 @@ internal static partial class MarkdownParser
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MultiLineQuoteNodeMatcher,
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RepeatedSingleLineQuoteNodeMatcher,
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SingleLineQuoteNodeMatcher,
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// Headers
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HeaderNodeMatcher,
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ListNodeMatcher,
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// Code blocks
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MultiLineCodeBlockNodeMatcher,
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Tyrrrz
2 years ago