FiniteGroup::next() - Code Metrics - Inspection of "CS: Work in progress." - drupol/phpermutations - Measure and Improve Code Quality continuously with Scrutinizer

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by Pol

created 2019-12-17 20:36 UTC

FiniteGroup::next() A

↳ Parent: FiniteGroup

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	1
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	2
c	1
b	0
f	0
dl	0
loc	4
ccs	1
cts	1
cp	1
rs	10
cc	1
nc	1
nop	0
crap	1

<?php

declare(strict_types=1);

namespace drupol\phpermutations\Iterators;

use drupol\phpermutations\Iterators;

use function count;

/**
 * Class FiniteGroup.
 *
 * The finite group is an abelian finite cyclic group.
 */
class FiniteGroup extends Iterators
{
    /**
     * The group.
     *
     * @var int[]
     */
    protected $group;

    /**
     * The group size.
     *
     * @var int
     */
    protected $size;

    /**
     * Count elements of an object.
     *
     * @return int
     *             The number of element
     */
    public function count()
    {
        return count($this->group);
    }

    /**
     * {@inheritdoc}
     */
    public function current()
    {
        return current($this->group);
    }

    /**
     * Get the group size.
     *
     * @return int
     *             The size
     */
    public function getSize()
    {
        return (int) $this->size;
    }

    /**
     * {@inheritdoc}
     */
    public function next()
    {
        ++$this->key;
        next($this->group);
    }

    /**
     * Get the order.
     *
     * @param int $generator
     *                       The generator
     *
     * @return int
     *             The order
     */
    public function order($generator)
    {
        $result = [];

        foreach (range(1, $this->getSize()) as $number) {
            $value = ($generator ** $number) % $this->getSize();
            $result[$value] = $value;
        }

        return count($result);
    }

    /**
     * Set the group size.
     *
     * @param int $size
     *                  The size
     */
    public function setSize($size)
    {
        $this->size = $size;
        $this->computeGroup();
    }

    /**
     * {@inheritdoc}
     */
    public function valid()
    {
        return isset($this->group[$this->key()]);
    }

    /**
     * Clean out the group from unwanted values.
     */
    private function computeGroup()
    {
        $this->group = [];

        foreach (range(1, $this->getSize()) as $number) {
            if (1 === $this->gcd($number, $this->getSize())) {
                $this->group[] = $number;
            }
        }
    }

    /**
     * Get the greater common divisor between two numbers.
     *
     * @param int $a
     *               The first number
     * @param int $b
     *               The second number
     *
     * @return int
     *             The greater common divisor between $a and $b
     */
    private function gcd($a, $b)
    {
        return $b ? $this->gcd($b, $a % $b) : $a;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace drupol\phpermutations\Iterators;
6
7		use drupol\phpermutations\Iterators;
8
9		use function count;
10
11		/**
12		* Class FiniteGroup.
13		*
14		* The finite group is an abelian finite cyclic group.
15		*/
16		class FiniteGroup extends Iterators
17		{
18		/**
19		* The group.
20		*
21		* @var int[]
22		*/
23		protected $group;
24
25		/**
26		* The group size.
27		*
28		* @var int
29		*/
30		protected $size;
31
32		/**
33		* Count elements of an object.
34		*
35		* @return int
36		* The number of element
37		*/
38		public function count()
39	2	{
40		return count($this->group);
41	2	}
42	2
43		/**
44		* {@inheritdoc}
45		*/
46		public function current()
47	2	{
48		return current($this->group);
49	2	}
50
51		/**
52		* Get the group size.
53		*
54		* @return int
55	2	* The size
56		*/
57	2	public function getSize()
58	2	{
59	2	return (int) $this->size;
60		}
61
62		/**
63		* {@inheritdoc}
64	2	*/
65		public function next()
66	2	{
67		++$this->key;
68		next($this->group);
69		}
70
71		/**
72	2	* Get the order.
73		*
74	2	* @param int $generator
75	2	* The generator
76		*
77		* @return int
78		* The order
79		*/
80		public function order($generator)
81		{
82		$result = [];
83	2
84		foreach (range(1, $this->getSize()) as $number) {
85	2	$value = ($generator ** $number) % $this->getSize();
86		$result[$value] = $value;
87		}
88
89		return count($result);
90		}
91
92		/**
93		* Set the group size.
94	2	*
95		* @param int $size
96	2	* The size
97	2	*/
98	2	public function setSize($size)
99		{
100		$this->size = $size;
101		$this->computeGroup();
102		}
103
104		/**
105		* {@inheritdoc}
106	2	*/
107		public function valid()
108	2	{
109		return isset($this->group[$this->key()]);
110		}
111
112		/**
113		* Clean out the group from unwanted values.
114		*/
115		private function computeGroup()
116		{
117		$this->group = [];
118
119		foreach (range(1, $this->getSize()) as $number) {
120		if (1 === $this->gcd($number, $this->getSize())) {
121		$this->group[] = $number;
122		}
123		}
124		}
125
126		/**
127		* Get the greater common divisor between two numbers.
128		*
129		* @param int $a
130		* The first number
131		* @param int $b
132		* The second number
133		*
134		* @return int
135	2	* The greater common divisor between $a and $b
136		*/
137	2	private function gcd($a, $b)
138		{
139	2	return $b ? $this->gcd($b, $a % $b) : $a;
140	2	}
141		}
142

drupol / phpermutations

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FiniteGroup::next() A

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