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permissive-url-autolinks.txt (2216B)
1
2 # Permissive URL Autolinks
3
4 With the flag `MD_FLAG_PERMISSIVEURLAUTOLINKS`, MD4C enables more permissive recognition
5 of URLs and transform them to autolinks, even if they do not exactly follow the syntax
6 of autolink as specified in CommonMark specification.
7
8 This is standard CommonMark autolink:
9
10 ```````````````````````````````` example
11 Homepage: <https://github.com/mity/md4c>
12 .
13 <p>Homepage: <a href="https://github.com/mity/md4c">https://github.com/mity/md4c</a></p>
14 ````````````````````````````````
15
16 With the permissive autolinks enabled, this is sufficient:
17
18 ```````````````````````````````` example
19 Homepage: https://github.com/mity/md4c
20 .
21 <p>Homepage: <a href="https://github.com/mity/md4c">https://github.com/mity/md4c</a></p>
22 ````````````````````````````````
23
24 But this permissive autolink feature can work only for very widely used URL
25 schemes, in alphabetical order `ftp:`, `http:`, `https:`.
26
27 That's why this is not a permissive autolink:
28
29 ```````````````````````````````` example
30 ssh://root@example.com
31 .
32 <p>ssh://root@example.com</p>
33 ````````````````````````````````
34
35 The same rules for path validation as for permissivve WWW autolinks apply.
36 Therefore the final question mark here is not part of the autolink:
37
38 ```````````````````````````````` example
39 Have you ever visited http://www.zombo.com?
40 .
41 <p>Have you ever visited <a href="http://www.zombo.com">http://www.zombo.com</a>?</p>
42 ````````````````````````````````
43
44 But in contrast, in this example it is:
45
46 ```````````````````````````````` example
47 http://www.bing.com/search?q=md4c
48 .
49 <p><a href="http://www.bing.com/search?q=md4c">http://www.bing.com/search?q=md4c</a></p>
50 ````````````````````````````````
51
52 And finally one complex example:
53
54 ```````````````````````````````` example
55 http://commonmark.org
56
57 (Visit https://encrypted.google.com/search?q=Markup+(business))
58
59 Anonymous FTP is available at ftp://foo.bar.baz.
60 .
61 <p><a href="http://commonmark.org">http://commonmark.org</a></p>
62 <p>(Visit <a href="https://encrypted.google.com/search?q=Markup+(business)">https://encrypted.google.com/search?q=Markup+(business)</a>)</p>
63 <p>Anonymous FTP is available at <a href="ftp://foo.bar.baz">ftp://foo.bar.baz</a>.</p>
64 ````````````````````````````````