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@ -1,70 +1,70 @@
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using System.Collections.Generic;
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using System.Linq;
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using System.Text.RegularExpressions;
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using DiscordChatExporter.Core.Markdown.Ast;
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using DiscordChatExporter.Core.Markdown.Internal;
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using DiscordChatExporter.Domain.Markdown.Ast;
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using DiscordChatExporter.Domain.Markdown.Matching;
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namespace DiscordChatExporter.Core.Markdown
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namespace DiscordChatExporter.Domain.Markdown
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{
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// The following parsing logic is meant to replicate Discord's markdown grammar as close as possible
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public static class MarkdownParser
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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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/* 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<Node> BoldFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// 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<Node> ItalicFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// Capture any character until the earliest triple asterisk not followed by an asterisk
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private static readonly IMatcher<Node> ItalicBoldFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// 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<Node> ItalicAltFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// Capture any character until the earliest double underscore not followed by an underscore
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private static readonly IMatcher<Node> UnderlineFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// Capture any character until the earliest triple underscore not followed by an underscore
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private static readonly IMatcher<Node> ItalicUnderlineFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// Capture any character until the earliest double tilde
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private static readonly IMatcher<Node> StrikethroughFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// Capture any character until the earliest double pipe
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private static readonly IMatcher<Node> SpoilerFormattedNodeMatcher = new RegexMatcher<Node>(
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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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// 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<Node> SingleLineQuoteNodeMatcher = new RegexMatcher<Node>(
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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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// 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<Node> RepeatedSingleLineQuoteNodeMatcher = new RegexMatcher<Node>(
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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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@ -74,7 +74,7 @@ namespace DiscordChatExporter.Core.Markdown
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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<Node> MultiLineQuoteNodeMatcher = new RegexMatcher<Node>(
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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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@ -82,41 +82,42 @@ namespace DiscordChatExporter.Core.Markdown
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// Capture any character except backtick until a backtick
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// Blank lines at the beginning and end of content are trimmed
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private static readonly IMatcher<Node> InlineCodeBlockNodeMatcher = new RegexMatcher<Node>(
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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("`([^`]+)`", DefaultRegexOptions | RegexOptions.Singleline),
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m => new InlineCodeBlockNode(m.Groups[1].Value.Trim('\r', '\n')));
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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<Node> MultiLineCodeBlockNodeMatcher = new RegexMatcher<Node>(
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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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/* Mentions */
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// Capture @everyone
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private static readonly IMatcher<Node> EveryoneMentionNodeMatcher = new StringMatcher<Node>(
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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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// Capture @here
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private static readonly IMatcher<Node> HereMentionNodeMatcher = new StringMatcher<Node>(
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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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// Capture <@123456> or <@!123456>
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private static readonly IMatcher<Node> UserMentionNodeMatcher = new RegexMatcher<Node>(
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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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// Capture <#123456>
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private static readonly IMatcher<Node> ChannelMentionNodeMatcher = new RegexMatcher<Node>(
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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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// Capture <@&123456>
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private static readonly IMatcher<Node> RoleMentionNodeMatcher = new RegexMatcher<Node>(
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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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@ -127,29 +128,29 @@ namespace DiscordChatExporter.Core.Markdown
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// ... or surrogate pair
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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<Node> StandardEmojiNodeMatcher = new RegexMatcher<Node>(
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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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// Capture <:lul:123456> or <a:lul:123456>
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private static readonly IMatcher<Node> CustomEmojiNodeMatcher = new RegexMatcher<Node>(
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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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/* Links */
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// Capture [title](link)
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private static readonly IMatcher<Node> TitledLinkNodeMatcher = new RegexMatcher<Node>(
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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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// Capture any non-whitespace character after http:// or https:// until the last punctuation character or whitespace
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private static readonly IMatcher<Node> AutoLinkNodeMatcher = new RegexMatcher<Node>(
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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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// Same as auto link but also surrounded by angular brackets
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private static readonly IMatcher<Node> HiddenLinkNodeMatcher = new RegexMatcher<Node>(
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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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@ -157,31 +158,31 @@ namespace DiscordChatExporter.Core.Markdown
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// Capture the shrug emoticon
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// This escapes it from matching for formatting
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private static readonly IMatcher<Node> ShrugTextNodeMatcher = new StringMatcher<Node>(
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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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// 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<Node> IgnoredEmojiTextNodeMatcher = new RegexMatcher<Node>(
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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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// 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<Node> EscapedSymbolTextNodeMatcher = new RegexMatcher<Node>(
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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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// 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<Node> EscapedCharacterTextNodeMatcher = new RegexMatcher<Node>(
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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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// 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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private static readonly IMatcher<Node> AggregateNodeMatcher = new AggregateMatcher<Node>(
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private static readonly IMatcher<MarkdownNode> AggregateNodeMatcher = new AggregateMatcher<MarkdownNode>(
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// Escaped text
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ShrugTextNodeMatcher,
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IgnoredEmojiTextNodeMatcher,
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@ -223,7 +224,7 @@ namespace DiscordChatExporter.Core.Markdown
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);
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// Minimal set of matchers for non-multimedia formats (e.g. plain text)
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private static readonly IMatcher<Node> MinimalAggregateNodeMatcher = new AggregateMatcher<Node>(
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private static readonly IMatcher<MarkdownNode> MinimalAggregateNodeMatcher = new AggregateMatcher<MarkdownNode>(
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// Mentions
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EveryoneMentionNodeMatcher,
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HereMentionNodeMatcher,
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@ -235,15 +236,21 @@ namespace DiscordChatExporter.Core.Markdown
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CustomEmojiNodeMatcher
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);
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private static IReadOnlyList<Node> Parse(StringPart stringPart, IMatcher<Node> matcher) =>
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matcher.MatchAll(stringPart, p => new TextNode(p.ToString())).Select(r => r.Value).ToArray();
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private static IReadOnlyList<MarkdownNode> Parse(StringPart stringPart, IMatcher<MarkdownNode> matcher) =>
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matcher
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.MatchAll(stringPart, p => new TextNode(p.ToString()))
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.Select(r => r.Value)
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.ToArray();
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}
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private static IReadOnlyList<Node> Parse(StringPart stringPart) => Parse(stringPart, AggregateNodeMatcher);
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internal static partial class MarkdownParser
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{
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private static IReadOnlyList<MarkdownNode> Parse(StringPart stringPart) => Parse(stringPart, AggregateNodeMatcher);
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private static IReadOnlyList<Node> ParseMinimal(StringPart stringPart) => Parse(stringPart, MinimalAggregateNodeMatcher);
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private static IReadOnlyList<MarkdownNode> ParseMinimal(StringPart stringPart) => Parse(stringPart, MinimalAggregateNodeMatcher);
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public static IReadOnlyList<Node> Parse(string input) => Parse(new StringPart(input));
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public static IReadOnlyList<MarkdownNode> Parse(string input) => Parse(new StringPart(input));
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public static IReadOnlyList<Node> ParseMinimal(string input) => ParseMinimal(new StringPart(input));
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public static IReadOnlyList<MarkdownNode> ParseMinimal(string input) => ParseMinimal(new StringPart(input));
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}
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}
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Alexey Golub
5 years ago