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Create ID's for Header elements so they can be referenced in anchor tags #765

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Create ID's for Header elements so they can be referenced in anchor tags #765

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7ead769
Create ID's for Header elements so they can be referenced in anchor tags
netniV Apr 29, 2020
cd6912d
Fix up unit tests following previous commit
netniV Apr 30, 2020
680287b
Fix issue with multi-byte string compatibility
netniV May 4, 2020
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7 changes: 6 additions & 1 deletion Parsedown.php
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Expand Up @@ -553,15 +553,19 @@ protected function blockHeader($Line)
}

$text = trim($text, ' ');
$link = strtolower(str_replace(' ','-',$text));
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I think a more elaborate "sluggify" mechanism would be better here. For example, strtolower(preg_replace('/[^A-z-_]+'/, '-', $text)) to replace all non A-z/-/_ characters with a dash.

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@netniV netniV May 4, 2020 •
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Yeah, I'm not sure what GitHub's method of replacement is but think we should probably be using:

strtolower(preg_replace('/[^A-Za-z0-9\-_]+/', '-', $text))

Would you agree with that one?

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https://regex101.com/r/jWgxEc/1 - This is an example but I also had to include \v to prevent new lines from being picked up in the example.

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You are right, this approach is a better start. GitHuv flavor looks quite complicated and forgiving, so I put my regex hat.

Test gist: https://gist.github.com/Ayesh/250786888e7f4f146117aa96afcd0071
Suggested regex: [^\p{L}\p{N}\p{M}-]+
Implementation: https://3v4l.org/melBh

The third heading in the Gist contains letters from my Sinhalese language. It has letters in both \p{L} (letters) and \p{M} (marks). These two, combined with \p{N} (numbers) and the dash gives us the negating regex that strips out everything else.

This library already requires mbstring extension, so I don't see a problem with using mb_strtolower.

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OK, seems better 👍 I love it when a plan comes together.

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I have just pushed a change, which takes parts of yours but changes str_replace as well since we are talking potential multi-byte characters. Seems to work with the gist, let me know what you think.


$Block = array(
'element' => array(
'name' => 'h' . $level,
'attributes' => array(
'id' => $link,
),
'handler' => array(
'function' => 'lineElements',
'argument' => $text,
'destination' => 'elements',
)
),
),
);

Expand Down Expand Up @@ -1992,3 +1996,4 @@ static function instance($name = 'default')
'wbr', 'time',
);
}