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Add support for parsing Markdown inline links

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Extend the Markdown parsing regex to allow parsing so-called inline
links. Within the parenthesis () part of the Markdown URL syntax,
introduce a new capturing group:

    (
      \s+              // whitespace between actual URL and inline title
      (?<title>        // start of "title" named group
        ""             // opening double quote (doubled inside @ string)
        (
          [^""]        // any character but a double quote
          |            // or
          (?<=\\)      // the next character should be preceded by a \
          ""           // a double quote
        )*             // zero or more times
        ""             // closing double quote
      )
    )?                 // the whole group is optional

This allows for parsing the inline links as-provided by web. Correctness
is displayed by the passing tests.
This commit is contained in:
Bartłomiej Dach 2019-10-22 00:40:58 +02:00
parent a89ea78a7a
commit 24b7160522
1 changed files with 2 additions and 2 deletions
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4
osu.Game/Online/Chat/MessageFormatter.cs
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@ -1,4 +1,4 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// 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;
@ -20,7 +20,7 @@ namespace osu.Game.Online.Chat
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)(?!)))\]\((?<url>[a-z]+://[^ ]+)\)");
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]):