A way to override default Parsedown behavior

[maxlysenko]

Hello,
I found that it's possible to call a new function (closure) for processing a standard block/inline type if we have possibility to insert the new tag for that type into the BlockTypes/InlineType array in a particular position (higher than the tag we want to override).
Here is a possible workaround that is working for me:
If you change the addBlockType function to something like this:

public function addBlockType($type, $tag, $continuable = false, $completable = false, $index = null)
{
    if (!isset($index)) {
        $this->BlockTypes[$type] [] = $tag;
    } else {
        array_splice($this->BlockTypes[$type], $index, 0, $tag);
    }

    if ($continuable) {
        $this->continuable_blocks[] = $tag;
    }

    if ($completable) {
        $this->completable_blocks[] = $tag;
    }
}

and then in the onMarkdownInitialized event call addBlockType like this:

 $markdown->addBlockType('>', 'QuoteExtended', true, false, 0);

the tag is inserted into the BlockTypes array higher than the existing tag

 #BlockTypes: array:24 [
...
    ">" => array:2 [
      0 => "QuoteExtended"
      1 => "Quote"
    ]
...
]

and then the closures are called so it's possible to extend/override standard processing.

The same is true for the addInlineType:

public function addInlineType($type, $tag, $index = null)
{
    if (!isset($index)) {
        $this->InlineTypes[$type] [] = $tag;
    } else {
        array_splice($this->InlineTypes[$type], $index, 0, $tag);
    }

    $this->inlineMarkerList .= $type;
}

[rhukster]

How about a PR that can be tested for backwards compatibility?

I would definitely consider this for inclusion.

[maxlysenko]

Hello,
unfortunately I didn't have time to properly learn how to use GitHub and GitFlow, but I hope I made the PR right.

[rhukster]

Closing as we have this merged.