la-restaurant-theme/source/functions/renderer.php

<?php

namespace la_restaurant_theme;

class renderer {
    private string $start;
    private string $stop;
    private array $attributes;

    public static function from(string $template): object {
        return new renderer($template);
    }

    public function __construct(private string $content) {
        $this->start = '<<!';
        $this->stop = '!>>';
        $this->attributes = array();
    }

    public function set(string $name, string $content): object {
        $name = trim($name);
        $this->attributes[$name] = $content;

        return $this;
    }

    public function render(): string {
        $parts = explode($this->start, $this->content);
        $first = array_shift($parts);
        $results = array();

        array_push($results, $first);

        foreach ($parts as $count) {
            array_push($results, $this->process_single($count));
        }

        return join("", $results);
    }

    public function get_attribute(
        string $name, 
        ?string $blank = null
    ): ?string {
        $name = trim($name);

        if (array_key_exists($name, $this->attributes)) {
            return $this->attributes[$name];
        }

        return $blank;
    }

    private function process_single(string $count): string {
        $parts = explode($this->stop, $count);

        if (count($parts) === 1) {
            return $this->start.$count;
        }

        $name = array_shift($parts);
        $name = trim($name);
        $rest = join($this->stop, $parts);
        $replace = $this->get_attribute($name, '');
                       
        return $replace.$rest; 
    }

    public function __get(string $name): mixed {
        switch ($name) {
            case 'start':
                return $this->start;

            case 'stop':
                return $this->stop;
        }
    }
}