| 
                    1
                 | 
                                    
                                                     | 
                
                 | 
                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    2
                 | 
                                    
                                                     | 
                
                 | 
                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    3
                 | 
                                    
                                                     | 
                
                 | 
                 * @author Patsura Dmitry https://github.com/ovr <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    4
                 | 
                                    
                                                     | 
                
                 | 
                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    5
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    6
                 | 
                                    
                                                     | 
                
                 | 
                namespace PHPSA;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    7
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    8
                 | 
                                    
                                                     | 
                
                 | 
                use PhpParser\ParserFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    9
                 | 
                                    
                                                     | 
                
                 | 
                use Symfony\Component\Config\Definition\Builder\TreeBuilder;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    10
                 | 
                                    
                                                     | 
                
                 | 
                use Symfony\Component\Config\Definition\ConfigurationInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    11
                 | 
                                    
                                                     | 
                
                 | 
                use Symfony\Component\Config\Definition\Processor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    12
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    13
                 | 
                                    
                                                     | 
                
                 | 
                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    14
                 | 
                                    
                                                     | 
                
                 | 
                 * PHPSA configuration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    15
                 | 
                                    
                                                     | 
                
                 | 
                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    16
                 | 
                                    
                                                     | 
                
                 | 
                class Configuration implements ConfigurationInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    17
                 | 
                                    
                                                     | 
                
                 | 
                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    18
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    19
                 | 
                                    
                                                     | 
                
                 | 
                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    20
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    21
                 | 
                                    
                                                     | 
                
                 | 
                    protected $configuration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    22
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    23
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    24
                 | 
                                    
                                                     | 
                
                 | 
                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    25
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    26
                 | 
                                    
                                                     | 
                
                 | 
                    protected $path;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    27
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    28
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    29
                 | 
                                    
                                                     | 
                
                 | 
                     * Create a configuration from array.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    30
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    31
                 | 
                                    
                                                     | 
                
                 | 
                     * @param array $configuration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    32
                 | 
                                    
                                                     | 
                
                 | 
                     * @param array $analyzersConfiguration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    33
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    34
                 | 
                                    
                             296                          | 
                
                 | 
                    public function __construct(array $configuration = [], array $analyzersConfiguration = [], $path = "")  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    35
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    36
                 | 
                                    
                             296                          | 
                
                 | 
                        $this->path = $path;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    37
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    38
                 | 
                                    
                             296                          | 
                
                 | 
                        $processor = new Processor();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    39
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    40
                 | 
                                    
                             296                          | 
                
                 | 
                        $configTree = $this->getConfigTreeBuilder($analyzersConfiguration);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    41
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    42
                 | 
                                    
                             296                          | 
                
                 | 
                        $this->configuration = $processor->process(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    43
                 | 
                                    
                             296                          | 
                
                 | 
                            $configTree->buildTree(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    44
                 | 
                                    
                                                     | 
                
                 | 
                            $configuration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    45
                 | 
                                    
                             296                          | 
                
                 | 
                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    46
                 | 
                                    
                             296                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    47
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    48
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    49
                 | 
                                    
                                                     | 
                
                 | 
                     * Generates the configuration tree.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    50
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    51
                 | 
                                    
                                                     | 
                
                 | 
                     * @param array $analyzersConfiguration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    52
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    53
                 | 
                                    
                                                     | 
                
                 | 
                     * @return TreeBuilder  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    54
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    55
                 | 
                                    
                             296                          | 
                
                 | 
                    public function getConfigTreeBuilder(array $analyzersConfiguration = [])  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                        
                            
            
                                    
            
            
                | 
                    56
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    57
                 | 
                                    
                             296                          | 
                
                 | 
                        $treeBuilder = new TreeBuilder();  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    58
                 | 
                                    
                             296                          | 
                
                 | 
                        $root = $treeBuilder->root('phpsa'); | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    59
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    60
                 | 
                                    
                                                     | 
                
                 | 
                        $root  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    61
                 | 
                                    
                             296                          | 
                
                 | 
                            ->children()  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    62
                 | 
                                    
                             296                          | 
                
                 | 
                                ->booleanNode('blame')->defaultFalse()->end() | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    63
                 | 
                                    
                             296                          | 
                
                 | 
                                ->scalarNode('language_level') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    64
                 | 
                                    
                             296                          | 
                
                 | 
                                    ->defaultValue(PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION)  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    65
                 | 
                                    
                             296                          | 
                
                 | 
                                    ->attribute('example', '5.3') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    66
                 | 
                                    
                             296                          | 
                
                 | 
                                    ->attribute('info', 'Will be used to automatically disable the analyzers that require a greater version of PHP.') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    67
                 | 
                                    
                             296                          | 
                
                 | 
                                ->end()  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    68
                 | 
                                    
                             296                          | 
                
                 | 
                                ->enumNode('parser') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    69
                 | 
                                    
                             296                          | 
                
                 | 
                                    ->defaultValue('prefer-7') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    70
                 | 
                                    
                             296                          | 
                
                 | 
                                    ->attribute('label', 'Check types of Arguments.') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    71
                 | 
                                    
                             296                          | 
                
                 | 
                                    ->values([  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    72
                 | 
                                    
                             296                          | 
                
                 | 
                                        ParserFactory::PREFER_PHP7 => 'prefer-7',  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    73
                 | 
                                    
                             296                          | 
                
                 | 
                                        ParserFactory::PREFER_PHP5 => 'prefer-5',  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    74
                 | 
                                    
                             296                          | 
                
                 | 
                                        ParserFactory::ONLY_PHP7 => 'only-7',  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    75
                 | 
                                    
                             296                          | 
                
                 | 
                                        ParserFactory::ONLY_PHP5 => 'only-5'  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    76
                 | 
                                    
                             296                          | 
                
                 | 
                                    ])  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    77
                 | 
                                    
                             296                          | 
                
                 | 
                                ->end()  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    78
                 | 
                                    
                             296                          | 
                
                 | 
                            ->end()  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    79
                 | 
                                    
                                                     | 
                
                 | 
                        ;  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    80
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    81
                 | 
                                    
                                                     | 
                
                 | 
                        $analyzersConfigRoot = $root  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    82
                 | 
                                    
                             296                          | 
                
                 | 
                            ->children()  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    83
                 | 
                                    
                             296                          | 
                
                 | 
                                ->arrayNode('analyzers') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    84
                 | 
                                    
                             296                          | 
                
                 | 
                                ->addDefaultsIfNotSet();  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    85
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    86
                 | 
                                    
                             296                          | 
                
                 | 
                        $language_error = (new TreeBuilder())->root('language_error') | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    87
                 | 
                                    
                             296                          | 
                
                 | 
                            ->info("Contains all compiler notices. Those are raised when PHP with strict error reporting would create at least a Notice message. (mostly experimental)") | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    88
                 | 
                                    
                             296                          | 
                
                 | 
                            ->canBeDisabled();  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    89
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    90
                 | 
                                    
                             296                          | 
                
                 | 
                        $analyzersConfigRoot->append($language_error);  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    91
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    92
                 | 
                                    
                             296                          | 
                
                 | 
                        foreach ($analyzersConfiguration as $config) { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    93
                 | 
                                    
                             55                          | 
                
                 | 
                            $analyzersConfigRoot->append($config);  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    94
                 | 
                                    
                             296                          | 
                
                 | 
                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    95
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    96
                 | 
                                    
                             296                          | 
                
                 | 
                        return $treeBuilder;  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    97
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    98
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    99
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    100
                 | 
                                    
                                                     | 
                
                 | 
                     * Sets a configuration setting.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    101
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    102
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $key  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    103
                 | 
                                    
                                                     | 
                
                 | 
                     * @param mixed $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    104
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    105
                 | 
                                    
                             52                          | 
                
                 | 
                    public function setValue($key, $value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    106
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    107
                 | 
                                    
                             52                          | 
                
                 | 
                        $this->configuration[$key] = $value;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    108
                 | 
                                    
                             52                          | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    109
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    110
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    111
                 | 
                                    
                                                     | 
                
                 | 
                     * Gets a configuration setting.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    112
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    113
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $key  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    114
                 | 
                                    
                                                     | 
                
                 | 
                     * @param mixed $default  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    115
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    116
                 | 
                                    
                                                     | 
                
                 | 
                     * @return mixed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    117
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    118
                 | 
                                    
                             54                          | 
                
                 | 
                    public function getValue($key, $default = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    119
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    120
                 | 
                                    
                             54                          | 
                
                 | 
                        if (array_key_exists($key, $this->configuration)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    121
                 | 
                                    
                             54                          | 
                
                 | 
                            return $this->configuration[$key];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    122
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    123
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    124
                 | 
                                    
                                                     | 
                
                 | 
                        return $default;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    125
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    126
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    127
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    128
                 | 
                                    
                                                     | 
                
                 | 
                     * Checks if a configuration setting is set.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $key  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                                                     | 
                
                 | 
                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                             54                          | 
                
                 | 
                    public function valueIsTrue($key)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                             54                          | 
                
                 | 
                        return (bool) $this->configuration[$key];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                             2                          | 
                
                 | 
                    public function getPath()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                             2                          | 
                
                 | 
                        return $this->path;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
Very long variable names usually make code harder to read. It is therefore recommended not to make variable names too verbose.