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osu-lazer/osu.Game/Online/Chat/MessageFormatter.cs
2020-10-16 11:52:29 +02:00

307 lines
12 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace osu.Game.Online.Chat
{
public static class MessageFormatter
{
// [[Performance Points]] -> wiki:Performance Points (https://osu.ppy.sh/wiki/Performance_Points)
private static readonly Regex wiki_regex = new Regex(@"\[\[(?<text>[^\]]+)\]\]");
// (test)[https://osu.ppy.sh/b/1234] -> test (https://osu.ppy.sh/b/1234)
private static readonly Regex old_link_regex = new Regex(@"\((?<text>(((?<=\\)[\(\)])|[^\(\)])*(((?<open>\()(((?<=\\)[\(\)])|[^\(\)])*)+((?<close-open>\))(((?<=\\)[\(\)])|[^\(\)])*)+)*(?(open)(?!)))\)\[(?<url>[a-z]+://[^ ]+)\]");
// [https://osu.ppy.sh/b/1234 Beatmap [Hard] (poop)] -> Beatmap [hard] (poop) (https://osu.ppy.sh/b/1234)
private static readonly Regex new_link_regex = new Regex(@"\[(?<url>[a-z]+://[^ ]+) (?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]");
// [test](https://osu.ppy.sh/b/1234) -> test (https://osu.ppy.sh/b/1234) aka correct markdown format
private static readonly Regex markdown_link_regex = new Regex(@"\[(?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]\((?<url>[a-z]+://[^ ]+)(\s+(?<title>""([^""]|(?<=\\)"")*""))?\)");
// advanced, RFC-compatible regular expression that matches any possible URL, *but* allows certain invalid characters that are widely used
// This is in the format (<required>, [optional]):
// http[s]://<domain>.<tld>[:port][/path][?query][#fragment]
private static readonly Regex advanced_link_regex = new Regex(
// protocol
@"(?<link>[a-z]*?:\/\/" +
// domain + tld
@"(?<domain>(?:[a-z0-9]\.|[a-z0-9][a-z0-9-]*[a-z0-9]\.)*[a-z0-9-]*[a-z0-9]" +
// port (optional)
@"(?::\d+)?)" +
// path (optional)
@"(?<path>(?:(?:\/+(?:[a-z0-9$_\.\+!\*\',;:\(\)@&~=-]|%[0-9a-f]{2})*)*" +
// query (optional)
@"(?:\?(?:[a-z0-9$_\+!\*\',;:\(\)@&=\/~-]|%[0-9a-f]{2})*)?)?" +
// fragment (optional)
@"(?:#(?:[a-z0-9$_\+!\*\',;:\(\)@&=\/~-]|%[0-9a-f]{2})*)?)?)",
RegexOptions.IgnoreCase);
// 00:00:000 (1,2,3) - test
private static readonly Regex time_regex = new Regex(@"\d\d:\d\d:\d\d\d? [^-]*");
// #osu
private static readonly Regex channel_regex = new Regex(@"(#[a-zA-Z]+[a-zA-Z0-9]+)");
// Unicode emojis
private static readonly Regex emoji_regex = new Regex(@"(\uD83D[\uDC00-\uDE4F])");
private static void handleMatches(Regex regex, string display, string link, MessageFormatterResult result, int startIndex = 0, LinkAction? linkActionOverride = null, char[] escapeChars = null)
{
int captureOffset = 0;
foreach (Match m in regex.Matches(result.Text, startIndex))
{
var index = m.Index - captureOffset;
var displayText = string.Format(display,
m.Groups[0],
m.Groups["text"].Value,
m.Groups["url"].Value).Trim();
var linkText = string.Format(link,
m.Groups[0],
m.Groups["text"].Value,
m.Groups["url"].Value).Trim();
if (displayText.Length == 0 || linkText.Length == 0) continue;
// Remove backslash escapes in front of the characters provided in escapeChars
if (escapeChars != null)
displayText = escapeChars.Aggregate(displayText, (current, c) => current.Replace($"\\{c}", c.ToString()));
// Check for encapsulated links
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)
{
result.Text = result.Text.Remove(index, m.Length).Insert(index, displayText);
// since we just changed the line display text, offset any already processed links.
result.Links.ForEach(l => l.Index -= l.Index > index ? m.Length - displayText.Length : 0);
var details = GetLinkDetails(linkText);
result.Links.Add(new Link(linkText, index, displayText.Length, linkActionOverride ?? details.Action, details.Argument));
// adjust the offset for processing the current matches group.
captureOffset += m.Length - displayText.Length;
}
}
}
private static void handleAdvanced(Regex regex, MessageFormatterResult result, int startIndex = 0)
{
foreach (Match m in regex.Matches(result.Text, startIndex))
{
var index = m.Index;
var linkText = m.Groups["link"].Value;
var indexLength = linkText.Length;
var details = GetLinkDetails(linkText);
var link = new Link(linkText, index, indexLength, details.Action, details.Argument);
// sometimes an already-processed formatted link can reduce to a simple URL, too
// (example: [mean example - https://osu.ppy.sh](https://osu.ppy.sh))
// therefore we need to check if any of the pre-existing links contains the raw one we found
if (result.Links.All(existingLink => !existingLink.Overlaps(link)))
result.Links.Add(link);
}
}
public static LinkDetails GetLinkDetails(string url)
{
var args = url.Split('/', StringSplitOptions.RemoveEmptyEntries);
args[0] = args[0].TrimEnd(':');
switch (args[0])
{
case "http":
case "https":
// length > 3 since all these links need another argument to work
if (args.Length > 3 && args[1] == "osu.ppy.sh")
{
switch (args[2])
{
case "b":
case "beatmaps":
return new LinkDetails(LinkAction.OpenBeatmap, args[3]);
case "s":
case "beatmapsets":
case "d":
return new LinkDetails(LinkAction.OpenBeatmapSet, args[3]);
case "u":
case "users":
return new LinkDetails(LinkAction.OpenUserProfile, args[3]);
}
}
return new LinkDetails(LinkAction.External, null);
case "osu":
// every internal link also needs some kind of argument
if (args.Length < 3)
return new LinkDetails(LinkAction.External, null);
LinkAction linkType;
switch (args[1])
{
case "chan":
linkType = LinkAction.OpenChannel;
break;
case "edit":
linkType = LinkAction.OpenEditorTimestamp;
break;
case "b":
linkType = LinkAction.OpenBeatmap;
break;
case "s":
case "dl":
linkType = LinkAction.OpenBeatmapSet;
break;
case "spectate":
linkType = LinkAction.Spectate;
break;
case "u":
linkType = LinkAction.OpenUserProfile;
break;
default:
linkType = LinkAction.External;
break;
}
return new LinkDetails(linkType, args[2]);
case "osump":
return new LinkDetails(LinkAction.JoinMultiplayerMatch, args[1]);
default:
return new LinkDetails(LinkAction.External, null);
}
}
private static MessageFormatterResult format(string toFormat, int startIndex = 0, int space = 3)
{
var result = new MessageFormatterResult(toFormat);
// handle the [link display] format
handleMatches(new_link_regex, "{1}", "{2}", result, startIndex, escapeChars: new[] { '[', ']' });
// handle the standard markdown []() format
handleMatches(markdown_link_regex, "{1}", "{2}", result, startIndex, escapeChars: new[] { '[', ']' });
// handle the ()[] link format
handleMatches(old_link_regex, "{1}", "{2}", result, startIndex, escapeChars: new[] { '(', ')' });
// handle wiki links
handleMatches(wiki_regex, "{1}", "https://osu.ppy.sh/wiki/{1}", result, startIndex);
// handle bare links
handleAdvanced(advanced_link_regex, result, startIndex);
// handle editor times
handleMatches(time_regex, "{0}", "osu://edit/{0}", result, startIndex, LinkAction.OpenEditorTimestamp);
// handle channels
handleMatches(channel_regex, "{0}", "osu://chan/{0}", result, startIndex, LinkAction.OpenChannel);
var empty = "";
while (space-- > 0)
empty += "\0";
handleMatches(emoji_regex, empty, "{0}", result, startIndex);
return result;
}
public static Message FormatMessage(Message inputMessage)
{
var result = format(inputMessage.Content);
inputMessage.DisplayContent = result.Text;
// Sometimes, regex matches are not in order
result.Links.Sort();
inputMessage.Links = result.Links;
return inputMessage;
}
public static MessageFormatterResult FormatText(string text)
{
var result = format(text);
result.Links.Sort();
return result;
}
public class MessageFormatterResult
{
public List<Link> Links = new List<Link>();
public string Text;
public string OriginalText;
public MessageFormatterResult(string text)
{
OriginalText = Text = text;
}
}
}
public class LinkDetails
{
public LinkAction Action;
public string Argument;
public LinkDetails(LinkAction action, string argument)
{
Action = action;
Argument = argument;
}
}
public enum LinkAction
{
External,
OpenBeatmap,
OpenBeatmapSet,
OpenChannel,
OpenEditorTimestamp,
JoinMultiplayerMatch,
Spectate,
OpenUserProfile,
Custom
}
public class Link : IComparable<Link>
{
public string Url;
public int Index;
public int Length;
public LinkAction Action;
public string Argument;
public Link(string url, int startIndex, int length, LinkAction action, string argument)
{
Url = url;
Index = startIndex;
Length = length;
Action = action;
Argument = argument;
}
public bool Overlaps(Link otherLink) => Index < otherLink.Index + otherLink.Length && otherLink.Index < Index + Length;
public int CompareTo(Link otherLink) => Index > otherLink.Index ? 1 : -1;
}
}