Intermediate.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\Refinery\Parser\ABNF;
 
use ILIAS\Data\Result;
use ILIAS\Data\Result\Ok;
use ILIAS\Data\Result\Error;
use Closure;
 
class Intermediate
{
    private string $todo;
    private array $accepted;
 
    public function __construct(string $todo, array $accepted = [])
    {
        $this->todo = $todo;
        $this->accepted = $accepted;
    }
 
    public function value(): int
    {
        if ($this->todo === '') {
            return 0;
        }
        return ord($this->todo[0]);
    }
 
    public function accept(): Result
    {
        return new Ok((new self(
            substr($this->todo, 1),
            $this->accepted()
        ))->push([new Character(substr($this->todo, 0, 1))]));
    }
 
    public function push(array $values): self
    {
        return new self(
            $this->todo,
            array_merge($this->accepted, $values)
        );
    }
 
    public function reject(): Result
    {
        return new Error('Rejected.');
    }
 
    public function accepted(): array
    {
        return $this->accepted;
    }
 
    public function done(): bool
    {
        return '' === $this->todo;
    }
 
    public function onlyTodo(): self
    {
        return new self($this->todo);
    }
 
    public function transform(Closure $transform): Result
    {
        $string = '';
        foreach ($this->accepted as $data) {
            if (!$data instanceof Character) {
                return $transform($this->accepted);
            }
            $string .= $data->value();
        }
 
        return $transform($string);
    }
}