ConditionNode::accept() - Code Metrics - mishal/iless - Measure and Improve Code Quality continuously with Scrutinizer

ConditionNode::accept() A
last analyzed 2017-03-09 13:30 UTC

↳ Parent: ConditionNode

Complexity

Conditions	1
Paths	1

Size

Total Lines	5
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	5
rs	9.4285
c	0
b	0
f	0
cc	1
eloc	3
nc	1
nop	1

<?php

/*
 * This file is part of the ILess
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ILess\Node;

use ILess\Context;
use ILess\Node;
use ILess\Util;
use ILess\Visitor\VisitorInterface;

/**
 * Condition.
 */
class ConditionNode extends Node
{
    /**
     * Node type.
     *
     * @var string
     */
    protected $type = 'Condition';

    /**
     * The operator.
     *
     * @var string
     */
    private $op;

    /**
     * The left operand.
     *
     * @var Node
     */
    private $lvalue;

    /**
     * The right operand.
     *
     * @var Node
     */
    private $rvalue;

    /**
     * Current index.
     *
     * @var int
     */
    private $index = 0;

    /**
     * Negate the result?
     *
     * @var bool
     */
    private $negate = false;

    /**
     * Constructor.
     *
     * @param string $op The operator
     * @param Node $l The left operand
     * @param Node $r The right operand
     * @param int $i
     * @param bool $negate
     */
    public function __construct($op, Node $l, Node $r, $i = 0, $negate = false)
    {
        $this->op = trim($op);
        $this->lvalue = $l;
        $this->rvalue = $r;
        $this->index = $i;
        $this->negate = (boolean) $negate;
    }

    /**
     * {@inheritdoc}
     */
    public function accept(VisitorInterface $visitor)
    {
        $this->lvalue = $visitor->visit($this->lvalue);
        $this->rvalue = $visitor->visit($this->rvalue);
    }

    /**
     * Compiles the node.
     *
     * @param Context $context The context
     * @param array|null $arguments Array of arguments
     * @param bool|null $important Important flag
     *
     * @return bool
     */
    public function compile(Context $context, $arguments = null, $important = null)
    {
        $a = $this->lvalue->compile($context);
        $b = $this->rvalue->compile($context);

        switch ($this->op) {
            case 'and':
                $result = $a && $b;
                break;
            case 'or':
                $result = $a || $b;
                break;
            default:
                $compared = Util::compareNodes($a, $b);
                // strict comparison, we cannot use switch here
                if ($compared === -1) {
                    $result = $this->op === '<' || $this->op === '=<' || $this->op === '<=';
                } elseif ($compared === 0) {
                    $result = $this->op === '=' || $this->op === '>=' || $this->op === '=<' || $this->op === '<=';
                } elseif ($compared === 1) {
                    $result = $this->op === '>' || $this->op === '>=' || $this->op === '=>';
                } else {
                    $result = false;
                }
                break;
        }

        return $this->negate ? !$result : $result;
class Author {
    private $name;

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

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

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

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

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

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


1			<?php
2
3			/*
4			* This file is part of the ILess
5			*
6			* For the full copyright and license information, please view the LICENSE
7			* file that was distributed with this source code.
8			*/
9
10			namespace ILess\Node;
11
12			use ILess\Context;
13			use ILess\Node;
14			use ILess\Util;
15			use ILess\Visitor\VisitorInterface;
16
17			/**
18			* Condition.
19			*/
20			class ConditionNode extends Node
21			{
22			/**
23			* Node type.
24			*
25			* @var string
26			*/
27			protected $type = 'Condition';
28
29			/**
30			* The operator.
31			*
32			* @var string
33			*/
34			private $op;
35
36			/**
37			* The left operand.
38			*
39			* @var Node
40			*/
41			private $lvalue;
42
43			/**
44			* The right operand.
45			*
46			* @var Node
47			*/
48			private $rvalue;
49
50			/**
51			* Current index.
52			*
53			* @var int
54			*/
55			private $index = 0;
56
57			/**
58			* Negate the result?
59			*
60			* @var bool
61			*/
62			private $negate = false;
63
64			/**
65			* Constructor.
66			*
67			* @param string $op The operator
68			* @param Node $l The left operand
69			* @param Node $r The right operand
70			* @param int $i
71			* @param bool $negate
72			*/
73			public function __construct($op, Node $l, Node $r, $i = 0, $negate = false)
74			{
75			$this->op = trim($op);
76			$this->lvalue = $l;
77			$this->rvalue = $r;
78			$this->index = $i;
79			$this->negate = (boolean) $negate;
80			}
81
82			/**
83			* {@inheritdoc}
84			*/
85			public function accept(VisitorInterface $visitor)
86			{
87			$this->lvalue = $visitor->visit($this->lvalue);
88			$this->rvalue = $visitor->visit($this->rvalue);
89			}
90
91			/**
92			* Compiles the node.
93			*
94			* @param Context $context The context
95			* @param array\|null $arguments Array of arguments
96			* @param bool\|null $important Important flag
97			*
98			* @return bool
99			*/
100			public function compile(Context $context, $arguments = null, $important = null)
101			{
102			$a = $this->lvalue->compile($context);
103			$b = $this->rvalue->compile($context);
104
105			switch ($this->op) {
106			case 'and':
107			$result = $a && $b;
108			break;
109			case 'or':
110			$result = $a \|\| $b;
111			break;
112			default:
113			$compared = Util::compareNodes($a, $b);
114			// strict comparison, we cannot use switch here
115			if ($compared === -1) {
116			$result = $this->op === '<' \|\| $this->op === '=<' \|\| $this->op === '<=';
117			} elseif ($compared === 0) {
118			$result = $this->op === '=' \|\| $this->op === '>=' \|\| $this->op === '=<' \|\| $this->op === '<=';
119			} elseif ($compared === 1) {
120			$result = $this->op === '>' \|\| $this->op === '>=' \|\| $this->op === '=>';
121			} else {
122			$result = false;
123			}
124			break;
125			}
126
127			return $this->negate ? !$result : $result;
			0 ignored issues – show Bug Best Practice introduced 2016-03-10 07:34 UTC by Report Bug Copy Issue Report The return type of `return $this->negate ? !$result : $result;` (`boolean`) is incompatible with the return type declared by the interface `ILess\Node\CompilableInterface::compile` of type `ILess\Node`. 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 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('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. Loading history...
128			}
129			}
130

mishal / iless

ConditionNode::accept() A last analyzed 2017-03-09 13:30 UTC

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ConditionNode::accept() A
last analyzed 2017-03-09 13:30 UTC