vbbs/app/Classes/Parser.php

<?php

namespace App\Classes;

abstract class Parser
{
	protected $content = '';
	protected $startline = 0;
	public $fields = NULL;

	// Magic Fields that are pre-filled
	protected $fieldmap = [
		'a'=>'address#',
		'd'=>'%date',
	];

	public function __construct(string $content,int $startline=1)
	{
		$this->content = $content;
		$this->startline = $startline;
		$this->fields = collect();
	}

	public function __toString(): string
	{
		return $this->parse($this->startline);
	}

	abstract protected function parse($startline): string;
}