mirror of
https://github.com/ppy/osu.git
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370 lines
15 KiB
C#
370 lines
15 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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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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#nullable enable
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namespace osu.Game.Online.Chat
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{
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public static class MessageFormatter
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{
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// [[Performance Points]] -> wiki:Performance Points (https://osu.ppy.sh/wiki/Performance_Points)
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private static readonly Regex wiki_regex = new Regex(@"\[\[(?<text>[^\]]+)\]\]");
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// (test)[https://osu.ppy.sh/b/1234] -> test (https://osu.ppy.sh/b/1234)
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private static readonly Regex old_link_regex = new Regex(@"\((?<text>(((?<=\\)[\(\)])|[^\(\)])*(((?<open>\()(((?<=\\)[\(\)])|[^\(\)])*)+((?<close-open>\))(((?<=\\)[\(\)])|[^\(\)])*)+)*(?(open)(?!)))\)\[(?<url>[a-z]+://[^ ]+)\]");
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// [https://osu.ppy.sh/b/1234 Beatmap [Hard] (poop)] -> Beatmap [hard] (poop) (https://osu.ppy.sh/b/1234)
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private static readonly Regex new_link_regex = new Regex(@"\[(?<url>[a-z]+://[^ ]+) (?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]");
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// [test](https://osu.ppy.sh/b/1234) -> test (https://osu.ppy.sh/b/1234) aka correct markdown format
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private static readonly Regex markdown_link_regex = new Regex(@"\[(?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]\((?<url>[a-z]+://[^ ]+)(\s+(?<title>""([^""]|(?<=\\)"")*""))?\)");
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// advanced, RFC-compatible regular expression that matches any possible URL, *but* allows certain invalid characters that are widely used
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// This is in the format (<required>, [optional]):
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// http[s]://<domain>.<tld>[:port][/path][?query][#fragment]
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private static readonly Regex advanced_link_regex = new Regex(
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// protocol
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@"(?<link>[a-z]*?:\/\/" +
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// domain + tld
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@"(?<domain>(?:[a-z0-9]\.|[a-z0-9][a-z0-9-]*[a-z0-9]\.)*[a-z0-9-]*[a-z0-9]" +
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// port (optional)
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@"(?::\d+)?)" +
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// path (optional)
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@"(?<path>(?:(?:\/+(?:[a-z0-9$_\.\+!\*\',;:\(\)@&~=-]|%[0-9a-f]{2})*)*" +
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// query (optional)
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@"(?:\?(?:[a-z0-9$_\+!\*\',;:\(\)@&=\/~-]|%[0-9a-f]{2})*)?)?" +
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// fragment (optional)
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@"(?:#(?:[a-z0-9$_\+!\*\',;:\(\)@&=\/~-]|%[0-9a-f]{2})*)?)?)",
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RegexOptions.IgnoreCase);
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// 00:00:000 (1,2,3) - test
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// regex from https://github.com/ppy/osu-web/blob/651a9bac2b60d031edd7e33b8073a469bf11edaa/resources/assets/coffee/_classes/beatmap-discussion-helper.coffee#L10
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private static readonly Regex time_regex = new Regex(@"\b(((\d{2,}):([0-5]\d)[:.](\d{3}))(\s\((?:\d+[,|])*\d+\))?)");
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// #osu
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private static readonly Regex channel_regex = new Regex(@"(#[a-zA-Z]+[a-zA-Z0-9]+)");
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// Unicode emojis
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private static readonly Regex emoji_regex = new Regex(@"(\uD83D[\uDC00-\uDE4F])");
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/// <summary>
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/// The root URL for the website, used for chat link matching.
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/// </summary>
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public static string WebsiteRootUrl
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{
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set => websiteRootUrl = value
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.Trim('/') // trim potential trailing slash/
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.Split('/').Last(); // only keep domain name, ignoring protocol.
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}
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private static string websiteRootUrl = "osu.ppy.sh";
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private static void handleMatches(Regex regex, string display, string link, MessageFormatterResult result, int startIndex = 0, LinkAction? linkActionOverride = null, char[]? escapeChars = null)
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{
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int captureOffset = 0;
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foreach (Match m in regex.Matches(result.Text, startIndex))
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{
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var index = m.Index - captureOffset;
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var displayText = string.Format(display,
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m.Groups[0],
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m.Groups["text"].Value,
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m.Groups["url"].Value).Trim();
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var linkText = string.Format(link,
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m.Groups[0],
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m.Groups["text"].Value,
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m.Groups["url"].Value).Trim();
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if (displayText.Length == 0 || linkText.Length == 0) continue;
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// Remove backslash escapes in front of the characters provided in escapeChars
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if (escapeChars != null)
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displayText = escapeChars.Aggregate(displayText, (current, c) => current.Replace($"\\{c}", c.ToString()));
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// Check for encapsulated links
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if (result.Links.Find(l => (l.Index <= index && l.Index + l.Length >= index + m.Length) || (index <= l.Index && index + m.Length >= l.Index + l.Length)) == null)
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{
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result.Text = result.Text.Remove(index, m.Length).Insert(index, displayText);
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// since we just changed the line display text, offset any already processed links.
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result.Links.ForEach(l => l.Index -= l.Index > index ? m.Length - displayText.Length : 0);
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var details = GetLinkDetails(linkText);
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result.Links.Add(new Link(linkText, index, displayText.Length, linkActionOverride ?? details.Action, details.Argument));
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// adjust the offset for processing the current matches group.
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captureOffset += m.Length - displayText.Length;
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}
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}
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}
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private static void handleAdvanced(Regex regex, MessageFormatterResult result, int startIndex = 0)
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{
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foreach (Match m in regex.Matches(result.Text, startIndex))
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{
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var index = m.Index;
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var linkText = m.Groups["link"].Value;
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var indexLength = linkText.Length;
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var details = GetLinkDetails(linkText);
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var link = new Link(linkText, index, indexLength, details.Action, details.Argument);
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// sometimes an already-processed formatted link can reduce to a simple URL, too
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// (example: [mean example - https://osu.ppy.sh](https://osu.ppy.sh))
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// therefore we need to check if any of the pre-existing links contains the raw one we found
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if (result.Links.All(existingLink => !existingLink.Overlaps(link)))
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result.Links.Add(link);
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}
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}
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public static LinkDetails GetLinkDetails(string url)
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{
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var args = url.Split('/', StringSplitOptions.RemoveEmptyEntries);
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args[0] = args[0].TrimEnd(':');
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switch (args[0])
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{
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case "http":
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case "https":
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// length > 3 since all these links need another argument to work
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if (args.Length > 3 && args[1].EndsWith(websiteRootUrl, StringComparison.OrdinalIgnoreCase))
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{
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var mainArg = args[3];
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switch (args[2])
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{
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// old site only
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case "b":
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case "beatmaps":
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{
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string trimmed = mainArg.Split('?').First();
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if (int.TryParse(trimmed, out var id))
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return new LinkDetails(LinkAction.OpenBeatmap, id.ToString());
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break;
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}
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case "s":
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case "beatmapsets":
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case "d":
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{
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if (mainArg == "discussions")
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// handle discussion links externally for now
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return new LinkDetails(LinkAction.External, url);
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if (args.Length > 4 && int.TryParse(args[4], out var id))
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// https://osu.ppy.sh/beatmapsets/1154158#osu/2768184
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return new LinkDetails(LinkAction.OpenBeatmap, id.ToString());
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// https://osu.ppy.sh/beatmapsets/1154158#whatever
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string trimmed = mainArg.Split('#').First();
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if (int.TryParse(trimmed, out id))
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return new LinkDetails(LinkAction.OpenBeatmapSet, id.ToString());
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break;
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}
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case "u":
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case "users":
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return new LinkDetails(LinkAction.OpenUserProfile, mainArg);
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case "wiki":
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return new LinkDetails(LinkAction.OpenWiki, string.Join('/', args.Skip(3)));
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case "home":
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if (mainArg != "changelog")
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// handle link other than changelog as external for now
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return new LinkDetails(LinkAction.External, url);
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switch (args.Length)
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{
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case 4:
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// https://osu.ppy.sh/home/changelog
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return new LinkDetails(LinkAction.OpenChangelog, string.Empty);
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case 6:
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// https://osu.ppy.sh/home/changelog/lazer/2021.1006
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return new LinkDetails(LinkAction.OpenChangelog, $"{args[4]}/{args[5]}");
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}
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break;
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}
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}
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break;
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case "osu":
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// every internal link also needs some kind of argument
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if (args.Length < 3)
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break;
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LinkAction linkType;
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switch (args[1])
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{
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case "chan":
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linkType = LinkAction.OpenChannel;
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break;
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case "edit":
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linkType = LinkAction.OpenEditorTimestamp;
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break;
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case "b":
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linkType = LinkAction.OpenBeatmap;
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break;
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case "s":
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case "dl":
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linkType = LinkAction.OpenBeatmapSet;
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break;
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case "spectate":
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linkType = LinkAction.Spectate;
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break;
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case "u":
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linkType = LinkAction.OpenUserProfile;
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break;
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default:
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linkType = LinkAction.External;
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break;
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}
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return new LinkDetails(linkType, args[2]);
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case "osump":
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return new LinkDetails(LinkAction.JoinMultiplayerMatch, args[1]);
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}
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return new LinkDetails(LinkAction.External, url);
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}
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private static MessageFormatterResult format(string toFormat, int startIndex = 0, int space = 3)
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{
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var result = new MessageFormatterResult(toFormat);
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// handle the [link display] format
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handleMatches(new_link_regex, "{1}", "{2}", result, startIndex, escapeChars: new[] { '[', ']' });
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// handle the standard markdown []() format
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handleMatches(markdown_link_regex, "{1}", "{2}", result, startIndex, escapeChars: new[] { '[', ']' });
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// handle the ()[] link format
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handleMatches(old_link_regex, "{1}", "{2}", result, startIndex, escapeChars: new[] { '(', ')' });
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// handle wiki links
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handleMatches(wiki_regex, "{1}", "https://osu.ppy.sh/wiki/{1}", result, startIndex);
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// handle bare links
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handleAdvanced(advanced_link_regex, result, startIndex);
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// handle editor times
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handleMatches(time_regex, "{0}", "osu://edit/{0}", result, startIndex, LinkAction.OpenEditorTimestamp);
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// handle channels
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handleMatches(channel_regex, "{0}", "osu://chan/{0}", result, startIndex, LinkAction.OpenChannel);
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var empty = "";
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while (space-- > 0)
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empty += "\0";
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handleMatches(emoji_regex, empty, "{0}", result, startIndex);
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return result;
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}
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public static Message FormatMessage(Message inputMessage)
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{
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var result = format(inputMessage.Content);
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inputMessage.DisplayContent = result.Text;
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// Sometimes, regex matches are not in order
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result.Links.Sort();
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inputMessage.Links = result.Links;
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return inputMessage;
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}
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public static MessageFormatterResult FormatText(string text)
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{
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var result = format(text);
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result.Links.Sort();
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return result;
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}
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public class MessageFormatterResult
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{
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public List<Link> Links = new List<Link>();
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public string Text;
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public string OriginalText;
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public MessageFormatterResult(string text)
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{
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OriginalText = Text = text;
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}
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}
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}
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public class LinkDetails
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{
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public readonly LinkAction Action;
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public readonly string Argument;
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public LinkDetails(LinkAction action, string argument)
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{
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Action = action;
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Argument = argument;
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}
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}
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public enum LinkAction
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{
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External,
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OpenBeatmap,
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OpenBeatmapSet,
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OpenChannel,
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OpenEditorTimestamp,
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JoinMultiplayerMatch,
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Spectate,
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OpenUserProfile,
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SearchBeatmapSet,
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OpenWiki,
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Custom,
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OpenChangelog,
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}
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public class Link : IComparable<Link>
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{
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public string Url;
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public int Index;
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public int Length;
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public LinkAction Action;
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public string Argument;
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public Link(string url, int startIndex, int length, LinkAction action, string argument)
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{
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Url = url;
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Index = startIndex;
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Length = length;
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Action = action;
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Argument = argument;
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}
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public bool Overlaps(Link otherLink) => Index < otherLink.Index + otherLink.Length && otherLink.Index < Index + Length;
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public int CompareTo(Link otherLink) => Index > otherLink.Index ? 1 : -1;
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}
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}
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