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Use C#9 features
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Tyrrrz
parent
9dda9cfc27
commit
63803f98aa
18 changed files with 99 additions and 71 deletions
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@ -9,74 +9,92 @@ namespace DiscordChatExporter.Domain.Markdown
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// The following parsing logic is meant to replicate Discord's markdown grammar as close as possible
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internal static partial class MarkdownParser
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{
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private const RegexOptions DefaultRegexOptions = RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.Multiline;
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private const RegexOptions DefaultRegexOptions =
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RegexOptions.Compiled |
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RegexOptions.CultureInvariant |
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RegexOptions.Multiline;
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/* Formatting */
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// Capture any character until the earliest double asterisk not followed by an asterisk
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private static readonly IMatcher<MarkdownNode> BoldFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\*\\*(.+?)\\*\\*(?!\\*)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Bold, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Bold, Parse(p.Slice(m.Groups[1])))
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);
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// Capture any character until the earliest single asterisk not preceded or followed by an 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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private static readonly IMatcher<MarkdownNode> ItalicFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\*(?!\\s)(.+?)(?<!\\s|\\*)\\*(?!\\*)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1])))
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);
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// Capture any character until the earliest triple asterisk not followed by an asterisk
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private static readonly IMatcher<MarkdownNode> ItalicBoldFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\*(\\*\\*.+?\\*\\*)\\*(?!\\*)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]), BoldFormattedNodeMatcher)));
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]), BoldFormattedNodeMatcher))
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);
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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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private static readonly IMatcher<MarkdownNode> ItalicAltFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("_([^_]+)_(?!\\w)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1])))
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);
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// Capture any character until the earliest double underscore not followed by an underscore
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private static readonly IMatcher<MarkdownNode> UnderlineFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("__(.+?)__(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Underline, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Underline, Parse(p.Slice(m.Groups[1])))
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);
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// Capture any character until the earliest triple underscore not followed by an underscore
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private static readonly IMatcher<MarkdownNode> ItalicUnderlineFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("_(__.+?__)_(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]), UnderlineFormattedNodeMatcher)));
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private static readonly IMatcher<MarkdownNode> ItalicUnderlineFormattedNodeMatcher =
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new RegexMatcher<MarkdownNode>(
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new Regex("_(__.+?__)_(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Italic,
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Parse(p.Slice(m.Groups[1]), UnderlineFormattedNodeMatcher))
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);
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// Capture any character until the earliest double tilde
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private static readonly IMatcher<MarkdownNode> StrikethroughFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("~~(.+?)~~", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Strikethrough, Parse(p.Slice(m.Groups[1]))));
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private static readonly IMatcher<MarkdownNode> StrikethroughFormattedNodeMatcher =
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new RegexMatcher<MarkdownNode>(
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new Regex("~~(.+?)~~", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Strikethrough, Parse(p.Slice(m.Groups[1])))
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);
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// Capture any character until the earliest double pipe
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private static readonly IMatcher<MarkdownNode> SpoilerFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\|\\|(.+?)\\|\\|", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Spoiler, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Spoiler, Parse(p.Slice(m.Groups[1])))
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);
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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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private static readonly IMatcher<MarkdownNode> SingleLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("^>\\s(.+\n?)", DefaultRegexOptions),
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(p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1])))
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);
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// Repeatedly capture any character until the end of the line
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// This one is tricky as it ends up producing multiple separate captures which need to be joined
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private static readonly IMatcher<MarkdownNode> RepeatedSingleLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("(?:^>\\s(.+\n?)){2,}", DefaultRegexOptions),
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(p, m) =>
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{
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var content = string.Concat(m.Groups[1].Captures.Select(c => c.Value));
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return new FormattedNode(TextFormatting.Quote, Parse(content));
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});
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private static readonly IMatcher<MarkdownNode> RepeatedSingleLineQuoteNodeMatcher =
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new RegexMatcher<MarkdownNode>(
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new Regex("(?:^>\\s(.+\n?)){2,}", DefaultRegexOptions),
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(_, m) =>
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{
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var content = string.Concat(m.Groups[1].Captures.Select(c => c.Value));
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return new FormattedNode(TextFormatting.Quote, Parse(content));
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}
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);
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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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private static readonly IMatcher<MarkdownNode> MultiLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("^>>>\\s(.+)", DefaultRegexOptions | RegexOptions.Singleline),
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(p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1]))));
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(p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1])))
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);
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/* Code blocks */
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@ -85,41 +103,48 @@ namespace DiscordChatExporter.Domain.Markdown
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// There can be either one or two backticks, but equal number on both sides
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private static readonly IMatcher<MarkdownNode> InlineCodeBlockNodeMatcher = new RegexMatcher<MarkdownNode>(
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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.Trim('\r', '\n'))
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);
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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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// Blank lines at the beginning and end of content are trimmed
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private static readonly IMatcher<MarkdownNode> MultiLineCodeBlockNodeMatcher = new RegexMatcher<MarkdownNode>(
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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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m => new MultiLineCodeBlockNode(m.Groups[1].Value, m.Groups[2].Value.Trim('\r', '\n'))
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);
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/* Mentions */
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// Capture @everyone
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private static readonly IMatcher<MarkdownNode> EveryoneMentionNodeMatcher = new StringMatcher<MarkdownNode>(
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"@everyone",
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p => new MentionNode("everyone", MentionType.Meta));
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_ => new MentionNode("everyone", MentionType.Meta)
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);
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// Capture @here
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private static readonly IMatcher<MarkdownNode> HereMentionNodeMatcher = new StringMatcher<MarkdownNode>(
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"@here",
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p => new MentionNode("here", MentionType.Meta));
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_ => new MentionNode("here", MentionType.Meta)
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);
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// Capture <@123456> or <@!123456>
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private static readonly IMatcher<MarkdownNode> UserMentionNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("<@!?(\\d+)>", DefaultRegexOptions),
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m => new MentionNode(m.Groups[1].Value, MentionType.User));
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m => new MentionNode(m.Groups[1].Value, MentionType.User)
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);
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// Capture <#123456>
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private static readonly IMatcher<MarkdownNode> ChannelMentionNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("<#(\\d+)>", DefaultRegexOptions),
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m => new MentionNode(m.Groups[1].Value, MentionType.Channel));
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m => new MentionNode(m.Groups[1].Value, MentionType.Channel)
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);
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// Capture <@&123456>
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private static readonly IMatcher<MarkdownNode> RoleMentionNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("<@&(\\d+)>", DefaultRegexOptions),
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m => new MentionNode(m.Groups[1].Value, MentionType.Role));
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m => new MentionNode(m.Groups[1].Value, MentionType.Role)
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);
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/* Emojis */
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@ -129,30 +154,36 @@ namespace DiscordChatExporter.Domain.Markdown
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// ... or digit followed by enclosing mark
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// (this does not match all emojis in Discord but it's reasonably accurate enough)
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private static readonly IMatcher<MarkdownNode> StandardEmojiNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("((?:[\\uD83C][\\uDDE6-\\uDDFF]){2}|[\\u2600-\\u26FF]|\\p{Cs}{2}|\\d\\p{Me})", DefaultRegexOptions),
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m => new EmojiNode(m.Groups[1].Value));
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new Regex("((?:[\\uD83C][\\uDDE6-\\uDDFF]){2}|[\\u2600-\\u26FF]|\\p{Cs}{2}|\\d\\p{Me})",
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DefaultRegexOptions),
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m => new EmojiNode(m.Groups[1].Value)
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);
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// Capture <:lul:123456> or <a:lul:123456>
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private static readonly IMatcher<MarkdownNode> CustomEmojiNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("<(a)?:(.+?):(\\d+?)>", DefaultRegexOptions),
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m => new EmojiNode(m.Groups[3].Value, m.Groups[2].Value, !string.IsNullOrWhiteSpace(m.Groups[1].Value)));
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m => new EmojiNode(m.Groups[3].Value, m.Groups[2].Value, !string.IsNullOrWhiteSpace(m.Groups[1].Value))
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);
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/* Links */
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// Capture [title](link)
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private static readonly IMatcher<MarkdownNode> TitledLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\[(.+?)\\]\\((.+?)\\)", DefaultRegexOptions),
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m => new LinkNode(m.Groups[2].Value, m.Groups[1].Value));
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m => new LinkNode(m.Groups[2].Value, m.Groups[1].Value)
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);
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// Capture any non-whitespace character after http:// or https:// until the last punctuation character or whitespace
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private static readonly IMatcher<MarkdownNode> AutoLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
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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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m => new LinkNode(m.Groups[1].Value)
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);
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// Same as auto link but also surrounded by angular brackets
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private static readonly IMatcher<MarkdownNode> HiddenLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
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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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m => new LinkNode(m.Groups[1].Value)
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);
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/* Text */
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@ -160,25 +191,29 @@ namespace DiscordChatExporter.Domain.Markdown
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// This escapes it from matching for formatting
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private static readonly IMatcher<MarkdownNode> ShrugTextNodeMatcher = new StringMatcher<MarkdownNode>(
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@"¯\_(ツ)_/¯",
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p => new TextNode(p.ToString()));
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p => new TextNode(p.ToString())
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);
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// Capture some specific emojis that don't get rendered
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// This escapes it from matching for emoji
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private static readonly IMatcher<MarkdownNode> IgnoredEmojiTextNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("(\\u26A7|\\u2640|\\u2642|\\u2695|\\u267E|\\u00A9|\\u00AE|\\u2122)", DefaultRegexOptions),
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m => new TextNode(m.Groups[1].Value));
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m => new TextNode(m.Groups[1].Value)
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);
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// Capture any "symbol/other" character or surrogate pair preceded by a backslash
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// This escapes it from matching for emoji
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private static readonly IMatcher<MarkdownNode> EscapedSymbolTextNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\\\(\\p{So}|\\p{Cs}{2})", DefaultRegexOptions),
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m => new TextNode(m.Groups[1].Value));
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m => new TextNode(m.Groups[1].Value)
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);
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// Capture any non-whitespace, non latin alphanumeric character preceded by a backslash
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// This escapes it from matching for formatting or other tokens
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private static readonly IMatcher<MarkdownNode> EscapedCharacterTextNodeMatcher = new RegexMatcher<MarkdownNode>(
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new Regex("\\\\([^a-zA-Z0-9\\s])", DefaultRegexOptions),
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m => new TextNode(m.Groups[1].Value));
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m => new TextNode(m.Groups[1].Value)
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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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@ -25,7 +25,7 @@ namespace DiscordChatExporter.Domain.Markdown.Matching
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{
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}
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public StringPart Slice(int newStartIndex, int newLength) => new StringPart(Target, newStartIndex, newLength);
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public StringPart Slice(int newStartIndex, int newLength) => new(Target, newStartIndex, newLength);
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public StringPart Slice(int newStartIndex) => Slice(newStartIndex, EndIndex - newStartIndex);
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