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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Yiisoft\Db\Pgsql\Composite;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Composite type representation to PHP array parser for PostgreSQL Server.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class CompositeParser  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Converts composite type value from PostgreSQL to PHP array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value String to convert.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function parse(string $value): array|null  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($value[0] !== '(') { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return null;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->parseComposite($value);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Parses PostgreSQL composite type value encoded in string.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value String to parse.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function parseComposite(string $value): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for ($result = [], $i = 1;; ++$i) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result[] = match ($value[$i]) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ',', ')' => null,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                '"' => $this->parseQuotedString($value, $i),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                default => $this->parseUnquotedString($value, $i),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            };  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($value[$i] === ')') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Parses quoted string.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function parseQuotedString(string $value, int &$i): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for ($result = '', ++$i;; ++$i) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($value[$i] === '\\') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ++$i;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } elseif ($value[$i] === '"') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ++$i;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result .= $value[$i];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Parses unquoted string.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function parseUnquotedString(string $value, int &$i): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for ($result = '';; ++$i) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (in_array($value[$i], [',', ')'], true)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result .= $value[$i];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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For hinted functions/methods where all return statements with the correct type are only reachable via conditions, ?null? gets implicitly returned which may be incompatible with the hinted type. Let?s take a look at an example: