<?php

namespace Picea\Extension;

use Picea\Compiler\Context;

class TitleExtension implements Extension {

    public string $token = "title";
    
    public string $title = "";
    
    public function __construct(Context $context) {
        $this->register($context);
    }

    public function register(Context $context) : void
    {
        $context->pushFunction("title", [ $this, 'handleTitle' ]);
    }
    
    public function parse(/*\Picae\Compiler\Context*/ &$context, ?string $arguments, string $token) {
        return "<?php echo title($arguments) ?>";
    }
    
    public function handleTitle(? string $set = null) : ? string
    {
        if ( $set === null ) {
            return $this->title;
        }
        else {
            # Fixed a bug where template inheritance was rewriting title
            if ( empty($this->title) ) {
                $this->title = $set;
            }
        }
        
        return null;
    }
}