FileParser   A
last analyzed

Complexity

Total Complexity 3

Size/Duplication

Total Lines 40
Duplicated Lines 0 %

Coupling/Cohesion

Components 0
Dependencies 3

Importance

Changes 0
Metric Value
wmc 3
lcom 0
cbo 3
dl 0
loc 40
rs 10
c 0
b 0
f 0

3 Methods

Rating   Name   Duplication   Size   Complexity  
A getCommandName() 0 4 1
A getDefaultCommands() 0 8 1
A getDefinition() 0 7 1
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<?php
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namespace SegmentIO\Cli;
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use SegmentIO\Cli\Command\FileParserCommand;
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use Symfony\Component\Console\Application;
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use Symfony\Component\Console\Input\InputInterface;
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/**
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 * FileParser Class
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 *
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 * @author Keith Kirk <[email protected]>
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 */
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class FileParser extends Application
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{
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    /**
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     * Gets the name of the command based on input.
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     *
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     * @param InputInterface $input The input interface
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     *
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     * @return string The command name
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     */
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    protected function getCommandName(InputInterface $input)
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    {
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        return 'parse';
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    }
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    /**
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     * Gets the default commands that should always be available.
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     *
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     * @return array An array of default Command instances
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     */
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    protected function getDefaultCommands()
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    {
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        $defaultCommands = parent::getDefaultCommands();
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        $defaultCommands[] = new FileParserCommand();
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        return $defaultCommands;
0 ignored issues
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Best Practice introduced by
The expression return $defaultCommands; seems to be an array, but some of its elements' types (SegmentIO\Cli\Command\FileParserCommand) are incompatible with the return type of the parent method Symfony\Component\Consol...ion::getDefaultCommands of type array<Symfony\Component\...le\Command\ListCommand>.

If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.

Let’s take a look at an example:

class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}

Our function my_function expects a Post object, and outputs the author of the post. The base class Post returns a simple string and outputting a simple string will work just fine. However, the child class BlogPost which is a sub-type of Post instead decided to return an object, and is therefore violating the SOLID principles. If a BlogPost were passed to my_function, PHP would not complain, but ultimately fail when executing the strtoupper call in its body.

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    }
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    /**
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     * Overridden so that the application doesn't expect the command
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     * name to be the first argument.
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     */
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    public function getDefinition()
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    {
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        $inputDefinition = parent::getDefinition();
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        $inputDefinition->setArguments();
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        return $inputDefinition;
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    }
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}
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