如何为解析后的table元素添加class属性？

I have some markdown files and I want to display them on my blog which developed by Laravel.

So I think out such a solution:

Controller

public function display() {
    $pd = new Parsedown();
    $text = Storage::disk('local')->get('x.md');
    $html = $pd->text($text);
    $title = "title";
    return view('x.y', [
        "html" => $html,
        "title" => $title
    ]);
}

Blade

<div class="container-fluid">
    <div class="row">
        <div class="panel panel-default">
            <div class="panel-heading">
                <h3 class="panel-title text-center">{{ $title }}</h3>
            </div>
            <div class="panel-body">
                {!! $html !!}
            </div>
        </div>
    </div>
</div>

It works well except table element:

Parsedown parse table like that:

header 1 | header 2
-------- | --------
cell 1.1 | cell 1.2
cell 2.1 | cell 2.2

into:

<table>
<thead>
<tr>
<th>header 1</th>
<th>header 2</th>
</tr>
</thead>
<tbody>
<tr>
<td>cell 1.1</td>
<td>cell 1.2</td>
</tr>
<tr>
<td>cell 2.1</td>
<td>cell 2.2</td>
</tr>
</tbody>
</table>

Then I got a table with no bootstrap styles, and it looks weird. What I want to get is:

<table class="table">
  ...
</table>

So, could anyone please give me some suggestions about that?

After I read the source code of Parsedown, I find a solution.

In blockTable() method:

change this:

        $Block = array(
            'alignments' => $alignments,
            'identified' => true,
            'element' => array(
                'name' => 'table',
                'handler' => 'elements'
            ),
        );

to:

        $Block = array(
            'alignments' => $alignments,
            'identified' => true,
            'element' => array(
                'name' => 'table',
                'handler' => 'elements',
                'attributes' => [       //+
                    "class" => "table"  //+
                ]                       //+
            ),
        );

And it will output table element with class="table".

Finally, I created a new class which extends Parsedown, and override that blockTable method with my own implementation.

Parsedown does not support adding class to generated elements. Parsedown also does not support emitting the generated HTML as an XML document. Therefore, you have two choices:

1. Use preg_replace to replace with regular expressions.
2. Use SimpleXML (or similar) to parse the HTML tree and replace elements.

Since the HTML Parsedown generates is simple, well-formed, and predictable you can probably get away with preg_replace. The implementation would look something like this:

public function display() {
    $pd = new Parsedown();
    $text = Storage::disk('local')->get('x.md');
    $html = $pd->text($text);
    $html = preg_replace('/^\s*<table>\s*$/', '<table class="table">', $html);
    $title = "title";
    return view('x.y', [
        "html" => $html,
        "title" => $title
    ]);
}