Custom classes tag breaks/errors when code contains function with a parameter (php) #166

Environment:

• OS: MacOS Sequoia
• PHP version: 8.3

What happens:

When there is a function with a parameter in the code surrounded by custom classes tag, I either get an error, or the argument gets cut weirdly.
For example, if I have this: {:_:function ($test) {:}, it will return this:

<span class="_"><span class="hl-keyword">function</span> ($te<span class="hl-injection">$test</span></span>) {

Which visually looks like this: function ($te$test) {

And if I add the second bracket like so {:_:function ($test) {}:}, I get this error:

What should happen

I expect to get this output:

<span class="_"><span class="hl-keyword">function</span> (<span class="hl-injection">$test</span>) {}</span>

Steps to reproduce:

1. Create a new Tempest project with composer create-project tempest/app my-app --stability alpha
2. Copy this in HomeController

<?php

declare(strict_types=1);

namespace App;

use Tempest\Highlight\Highlighter;
use Tempest\Http\Get;

use function Tempest\view;

use Tempest\View\View;

final readonly class HomeController
{
    #[Get('/')]
    public function __invoke(): View
    {
        // To show the error, put this in the 'CODE' string: `{:_:function ($test) {}:}`
        $code = (new Highlighter())->parse(
                <<<'CODE'
                {:_:function ($test) {:}
                CODE,
                'php'
            );

        return view('home.view.php')->data(code: $code);
    }
}

3. Copy this in home.view.php

<html lang="en">
<head>
    <title>Tempest</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="/main.css" rel="stylesheet">
</head>
<body class="flex justify-center items-center">
<div>
{!! $code !!}
</div>
</body>
</html>

4. Run ./tempest serve

Additional context:

• Everything works fine when you remove the custom classes tags