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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Genkgo\Mail\Protocol\Imap\MessageData;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class SectionList  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package Genkgo\Mail\Protocol\Imap\MessageData  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class SectionList  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private CONST RFC_3501_SECTION_FIXED = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'HEADER' => true,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'TEXT' => true,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $sections = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $forceBrackets = false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * SectionList constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $sections  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct(array $sections = [])  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        foreach ($sections as $section) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->validateSection($section);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->sections = $sections;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __toString(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->forceBrackets === false && empty($this->sections)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return sprintf(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            '[%s]',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            implode(' ', $this->sections) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return SectionList  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function newEmpty(): self  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $list = new self();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $list->forceBrackets = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $list;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $sections  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return SectionList  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function fromString(string $sections): self  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $result = preg_match('/^\[(.*?)\]$/', $sections, $matches); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($result !== 1) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \InvalidArgumentException('No section list'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $sections = array_filter(explode(' ', $matches[1])); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for ($i = 0; $i < count($sections); $i++) { | 
            
                            
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                            if ($sections[$i] === 'HEADER.FIELDS' || $sections[$i] === 'HEADER.FIELDS.NOT') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if ($sections[$i + 1][0] !== '(') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    throw new \InvalidArgumentException(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        'HEADER.FIELDS or HEADER.FIELDS.NOT requires header-list'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                do { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $sections[$i] .= $sections[$i + 1];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    unset($sections[$i + 1]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                } while (isset($sections[$i + 1]) && substr($sections[$i + 1], -1) !== ')');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $sectionList = new self($sections);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (empty($sectionList->sections)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $sectionList->forceBrackets = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $sectionList;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $section  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function validateSection(string $section): void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($section === '') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \InvalidArgumentException('Empty section'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset(self::RFC_3501_SECTION_FIXED[$section])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (preg_match('/^HEADER.FIELDS(\.NOT)? \((.*?)\)$/', $section) === 1) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        throw new \InvalidArgumentException('Invalid section item ' . $section); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                        
If the size of the collection does not change during the iteration, it is generally a good practice to compute it beforehand, and not on each iteration: