parser.php

<?php
 
 
namespace Bitrix\Calendar\ICal\Parser;
 
 
use Generator;
 
class Parser
{
    private $content;
    private $linesGenerator;
    private $component;
 
    public static function createInstance(string $content): Parser
    {
        return new self($content);
    }
 
    public function __construct(string $content)
    {
        $this->content = $content;
    }
 
    public function parse(): Parser
    {
        $this->linesGenerator = $this->getLinesGenerator();
        $this->component = $this->handle();
 
        return $this;
    }
 
    private function getLinesGenerator(): ?Generator
    {
        $tmp = explode("\r\n", $this->content);
 
        for ($i = 0, $length = count($tmp); $i < $length; $i++)
        {
            $line = rtrim($tmp[$i]);
 
            while (isset($tmp[$i + 1]) && mb_strlen($tmp[$i + 1]) > 0 && ($tmp[$i + 1][0] === ' ' || $tmp[$i + 1][0] === "\t" ))
            {
                $line .= rtrim(mb_substr($tmp[++$i],1));
            }
 
            yield $line;
        }
 
        return null;
    }
 
    private function handle(): ?ParserComponent
    {
        $componentName = '';
        $properties = [];
        $componentsCollection = new ComponentsCollection();
 
        while ($str = $this->linesGenerator->current())
        {
            $line = Line::createInstance($str);
            $line->parse();
 
            if ($line->isBegin())
            {
                if ($componentName)
                {
                    $componentsCollection->add($this->handle());
                }
                else
                {
                    $componentName = mb_strtolower($line->getValue());
                }
            }
            elseif ($line->isEnd())
            {
                return FactoryComponents::createInstance($componentName)
                    ->createComponent($properties, $componentsCollection)
                    ->getComponent();
            }
            elseif (in_array($line->getName(), ['attendee', 'attach']))
            {
                $properties[$line->getName()][] = ParserPropertyType::createInstance($line->getName())
                    ->addParameters($line->getParams())
                    ->setValue($line->getValue());
            }
            else
            {
                $properties[$line->getName()] = ParserPropertyType::createInstance($line->getName())
                    ->addParameters($line->getParams())
                    ->setValue($line->getValue());
            }
 
            $this->linesGenerator->next();
        }
 
        return null;
    }
 
    public function getCalendarComponent(): ?Calendar
    {
        return ($this->component instanceof Calendar)
            ? $this->component
            : null
        ;
    }
 
//  private static function _ValidUtf8( $data ) {
//      $rx  = '[\xC0-\xDF]([^\x80-\xBF]|$)';
//      $rx .= '|[\xE0-\xEF].{0,1}([^\x80-\xBF]|$)';
//      $rx .= '|[\xF0-\xF7].{0,2}([^\x80-\xBF]|$)';
//      $rx .= '|[\xF8-\xFB].{0,3}([^\x80-\xBF]|$)';
//      $rx .= '|[\xFC-\xFD].{0,4}([^\x80-\xBF]|$)';
//      $rx .= '|[\xFE-\xFE].{0,5}([^\x80-\xBF]|$)';
//      $rx .= '|[\x00-\x7F][\x80-\xBF]';
//      $rx .= '|[\xC0-\xDF].[\x80-\xBF]';
//      $rx .= '|[\xE0-\xEF]..[\x80-\xBF]';
//      $rx .= '|[\xF0-\xF7]...[\x80-\xBF]';
//      $rx .= '|[\xF8-\xFB]....[\x80-\xBF]';
//      $rx .= '|[\xFC-\xFD].....[\x80-\xBF]';
//      $rx .= '|[\xFE-\xFE]......[\x80-\xBF]';
//      $rx .= '|^[\x80-\xBF]';
//
//      return ( ! (bool) preg_match('!'.$rx.'!', $data) );
//  }
}