OrderedEnumerable::getIterator() - Code Metrics - Athari/YaLinqo - Measure and Improve Code Quality continuously with Scrutinizer

OrderedEnumerable::getIterator() A
last analyzed 2018-05-11 22:32 UTC

↳ Parent: OrderedEnumerable

Complexity

Conditions	2
Paths	2

Size

Total Lines	11
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	2
eloc	7
c	1
b	0
f	0
nc	2
nop	0
dl	0
loc	11
rs	9.4285

<?php

/**
 * OrderedEnumerable class.
 * @author Alexander Prokhorov
 * @license Simplified BSD
 * @link https://github.com/Athari/YaLinqo YaLinqo on GitHub
 */

namespace YaLinqo;

/**
 * Subclass of Enumerable supporting ordering by multiple conditions.
 * @package YaLinqo
 */
class OrderedEnumerable extends Enumerable
{
    /** Source sequence. @var Enumerable */
    private $source;
    /** Parent ordered sequence. @var \YaLinqo\OrderedEnumerable */
    private $parent;
    /** Sort order for array_multisort: SORT_DESC or SORT_ASC. @var int|bool */
    private $sortOrder;
    /** Sort flags for array_multisort. @var int */
    private $sortFlags;
    /** Whether comparer result needs to be negated (used in usort). @var bool */
    private $isReversed;
    /** Key selector. @var callable {(v, k) ==> key} */
    private $keySelector;
    /** Comprarer function. @var callable {(a, b) ==> diff} */
    private $comparer;

    /**
     * @internal
     * @param Enumerable $source
     * @param int|bool $sortOrder A direction in which to order the elements: false or SORT_DESC for ascending (by increasing value), true or SORT_ASC for descending (by decreasing value).
     * @param int $sortFlags Sort flags for array_multisort.
     * @param bool $isReversed Whether comparer result needs to be negated (used in usort).
     * @param callable $keySelector {(v, k) ==> key} A function to extract a key from an element.
     * @param callable $comparer {(a, b) ==> diff} Difference between a and b: &lt;0 if a&lt;b; 0 if a==b; &gt;0 if a&gt;b
     * @param \YaLinqo\OrderedEnumerable $parent
     */
    public function __construct($source, $sortOrder, $sortFlags, $isReversed, $keySelector, $comparer, $parent = null)
    {
        $this->source = $source;
        $this->sortOrder = $sortOrder;
        $this->sortFlags = $sortFlags;
        $this->isReversed = $isReversed;
        $this->keySelector = $keySelector;
        $this->comparer = $comparer;
        $this->parent = $parent;
    }

    private function getSingleComparer()
    {
        $comparer = $this->comparer;
        if ($this->isReversed)
            $comparer = function($a, $b) use ($comparer) { return -$comparer($a, $b); };
        return $comparer;
    }

    /**
     * <p><b>Syntax</b>: thenByDir (false|true [, {{(v, k) ==> key} [, {{(a, b) ==> diff}]])
     * <p>Performs a subsequent ordering of elements in a sequence in a particular direction (ascending, descending) according to a key.
     * <p>Three methods are defined to extend the type OrderedEnumerable, which is the return type of this method. These three methods, namely {@link thenBy}, {@link thenByDescending} and {@link thenByDir}, enable you to specify additional sort criteria to sort a sequence. These methods also return an OrderedEnumerable, which means any number of consecutive calls to thenBy, thenByDescending or thenByDir can be made.
     * <p>Because OrderedEnumerable inherits from {@link Enumerable}, you can call {@link Enumerable::orderBy orderBy}, {@link Enumerable::orderByDescending orderByDescending} or {@link Enumerable::orderByDir orderByDir} on the results of a call to orderBy, orderByDescending, orderByDir, thenBy, thenByDescending or thenByDir. Doing this introduces a new primary ordering that ignores the previously established ordering.
     * <p>This method performs an unstable sort; that is, if the keys of two elements are equal, the order of the elements is not preserved. In contrast, a stable sort preserves the order of elements that have the same key. Internally, {@link usort} is used.
     * @param int|bool $sortOrder A direction in which to order the elements: false or SORT_DESC for ascending (by increasing value), true or SORT_ASC for descending (by decreasing value).
     * @param callable|null $keySelector {(v, k) ==> key} A function to extract a key from an element. Default: value.
     * @param callable|int|null $comparer {(a, b) ==> diff} Difference between a and b: &lt;0 if a&lt;b; 0 if a==b; &gt;0 if a&gt;b. Can also be a combination of SORT_ flags.
     * @return \YaLinqo\OrderedEnumerable
     */
    public function thenByDir($sortOrder, $keySelector = null, $comparer = null): OrderedEnumerable
    {
        $sortFlags = Utils::lambdaToSortFlagsAndOrder($comparer, $sortOrder);
        $keySelector = Utils::createLambda($keySelector, 'v,k', Functions::$value);
        $isReversed = $sortOrder == SORT_DESC;
        $comparer = Utils::createComparer($comparer, $sortOrder, $isReversed);

        return new self($this->source, $sortOrder, $sortFlags, $isReversed, $keySelector, $comparer, $this);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
    }

    /**
     * <p><b>Syntax</b>: thenBy ([{{(v, k) ==> key} [, {{(a, b) ==> diff}]])
     * <p>Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.
     * <p>Three methods are defined to extend the type OrderedEnumerable, which is the return type of this method. These three methods, namely {@link thenBy}, {@link thenByDescending} and {@link thenByDir}, enable you to specify additional sort criteria to sort a sequence. These methods also return an OrderedEnumerable, which means any number of consecutive calls to thenBy, thenByDescending or thenByDir can be made.
     * <p>Because OrderedEnumerable inherits from {@link Enumerable}, you can call {@link Enumerable::orderBy orderBy}, {@link Enumerable::orderByDescending orderByDescending} or {@link Enumerable::orderByDir orderByDir} on the results of a call to orderBy, orderByDescending, orderByDir, thenBy, thenByDescending or thenByDir. Doing this introduces a new primary ordering that ignores the previously established ordering.
     * <p>This method performs an unstable sort; that is, if the keys of two elements are equal, the order of the elements is not preserved. In contrast, a stable sort preserves the order of elements that have the same key. Internally, {@link usort} is used.
     * @param callable|null $keySelector {(v, k) ==> key} A function to extract a key from an element. Default: value.
     * @param callable|int|null $comparer {(a, b) ==> diff} Difference between a and b: &lt;0 if a&lt;b; 0 if a==b; &gt;0 if a&gt;b. Can also be a combination of SORT_ flags.
     * @return \YaLinqo\OrderedEnumerable
     */
    public function thenBy($keySelector = null, $comparer = null): OrderedEnumerable
    {
        return $this->thenByDir(false, $keySelector, $comparer);
    }

    /**
     * <p><b>Syntax</b>: thenByDescending ([{{(v, k) ==> key} [, {{(a, b) ==> diff}]])
     * <p>Performs a subsequent ordering of the elements in a sequence in descending order according to a key.
     * <p>Three methods are defined to extend the type OrderedEnumerable, which is the return type of this method. These three methods, namely {@link thenBy}, {@link thenByDescending} and {@link thenByDir}, enable you to specify additional sort criteria to sort a sequence. These methods also return an OrderedEnumerable, which means any number of consecutive calls to thenBy, thenByDescending or thenByDir can be made.
     * <p>Because OrderedEnumerable inherits from {@link Enumerable}, you can call {@link Enumerable::orderBy orderBy}, {@link Enumerable::orderByDescending orderByDescending} or {@link Enumerable::orderByDir orderByDir} on the results of a call to orderBy, orderByDescending, orderByDir, thenBy, thenByDescending or thenByDir. Doing this introduces a new primary ordering that ignores the previously established ordering.
     * <p>This method performs an unstable sort; that is, if the keys of two elements are equal, the order of the elements is not preserved. In contrast, a stable sort preserves the order of elements that have the same key. Internally, {@link usort} is used.
     * @param callable|null $keySelector {(v, k) ==> key} A function to extract a key from an element. Default: value.
     * @param callable|int|null $comparer {(a, b) ==> diff} Difference between a and b: &lt;0 if a&lt;b; 0 if a==b; &gt;0 if a&gt;b. Can also be a combination of SORT_ flags.
     * @return \YaLinqo\OrderedEnumerable
     */
    public function thenByDescending($keySelector = null, $comparer = null): OrderedEnumerable
    {
        return $this->thenByDir(true, $keySelector, $comparer);
    }

    /** {@inheritdoc} */
    public function getIterator(): \Traversable
    {
        $canMultisort = $this->sortFlags !== null;
        $array = $this->source->tryGetArrayCopy();

        $it = $this->trySortBySingleField($array, $canMultisort);
        if ($it !== null)
            return $it;

        return $this->sortByMultipleFields($array, $canMultisort);
    }

    private function trySortBySingleField($array, bool $canMultisort)
    {
        if ($this->parent !== null || $array === null) {
            return null;
        }
        elseif ($this->keySelector === Functions::$value) {
            if (!$canMultisort)
                uasort($array, $this->getSingleComparer());
            elseif ($this->sortOrder == SORT_ASC)
                asort($array, $this->sortFlags);
            else
                arsort($array, $this->sortFlags);
        }
        elseif ($this->keySelector === Functions::$key) {
            if ($canMultisort)
                uksort($array, $this->getSingleComparer());
            elseif ($this->sortOrder == SORT_ASC)
                ksort($array, $this->sortFlags);
            else
                krsort($array, $this->sortFlags);
        }
        else {
            return null;
        }
        return new \ArrayIterator($array);
    }

    private function sortByMultipleFields($array, bool $canMultisort)
    {
        $orders = [];
        for ($order = $this; $order !== null; $order = $order->parent) {
            $orders[] = $order;
            if ($order->sortFlags === null)
                $canMultisort = false;
        }
        $orders = array_reverse($orders);

        $it = $this->trySortArrayWithMultisort($array, $orders, $canMultisort);
        if ($it !== null)
            return $it;

        return $this->sortIterator($orders, $canMultisort);
    }

    private function sortIterator(array $orders, bool $canMultisort)
    {
        $enum = [];
        if ($canMultisort)
            $this->sortIteratorWithMultisort($enum, $orders);
        else
            $this->sortIteratorWithUsort($enum, $orders);

        foreach ($enum as $pair)
            yield $pair[0] => $pair[1];
    }

    private function trySortArrayWithMultisort($array, array $orders, bool $canMultisort)
    {
        /** @var $order OrderedEnumerable */
        if ($array === null || !$canMultisort)
            return null;

        $args = [];
        foreach ($orders as $order) {
            $column = [];
            foreach ($array as $k => $v) {
                $keySelector = $order->keySelector;
                $column[$k] = $keySelector($v, $k);
            }
            $args[] = $column;
            $args[] = $order->sortOrder;
            $args[] = $order->sortFlags;
        }
        $args[] = &$array;

        call_user_func_array('array_multisort', $args);

        return new \ArrayIterator($array);
    }

    private function sortIteratorWithMultisort(&$enum, array $orders)
    {
        /** @var $order OrderedEnumerable */
        foreach ($this->source as $k => $v)
            $enum[] = [ $k, $v ];

        $args = [];
        foreach ($orders as $order) {
            $column = [];
            foreach ($enum as $k => $pair) {
                $keySelector = $order->keySelector;
                $column[$k] = $keySelector($pair[1], $pair[0]);
            }
            $args[] = $column;
            $args[] = $order->sortOrder;
            $args[] = $order->sortFlags;
        }
        $args[] = &$enum;

        call_user_func_array('array_multisort', $args);
    }

    private function sortIteratorWithUsort(&$enum, array $orders)
    {
        /** @var $order OrderedEnumerable */
        foreach ($this->source as $k => $v) {
            $element = [ $k, $v ];
            foreach ($orders as $order) {
                $keySelector = $order->keySelector;
                $element[] = $keySelector($v, $k);
            }
            $enum[] = $element;
        }

        usort($enum, function($a, $b) use ($orders) {
            /** @var $order OrderedEnumerable */
            $count = count($orders);
            for ($i = 0; $i < $count; $i++) {
                $order = $orders[$i];
                $comparer = $order->comparer;
                $diff = $comparer($a[$i + 2], $b[$i + 2]);
                if ($diff != 0)
                    return $order->isReversed ? -$diff : $diff;
            }
            return 0;
        });
    }
}


1			<?php
2
3			/**
4			* OrderedEnumerable class.
5			* @author Alexander Prokhorov
6			* @license Simplified BSD
7			* @link https://github.com/Athari/YaLinqo YaLinqo on GitHub
8			*/
9
10			namespace YaLinqo;
11
12			/**
13			* Subclass of Enumerable supporting ordering by multiple conditions.
14			* @package YaLinqo
15			*/
16			class OrderedEnumerable extends Enumerable
17			{
18			/** Source sequence. @var Enumerable */
19			private $source;
20			/** Parent ordered sequence. @var \YaLinqo\OrderedEnumerable */
21			private $parent;
22			/** Sort order for array_multisort: SORT_DESC or SORT_ASC. @var int\|bool */
23			private $sortOrder;
24			/** Sort flags for array_multisort. @var int */
25			private $sortFlags;
26			/** Whether comparer result needs to be negated (used in usort). @var bool */
27			private $isReversed;
28			/** Key selector. @var callable {(v, k) ==> key} */
29			private $keySelector;
30			/** Comprarer function. @var callable {(a, b) ==> diff} */
31			private $comparer;
32
33			/**
34			* @internal
35			* @param Enumerable $source
36			* @param int\|bool $sortOrder A direction in which to order the elements: false or SORT_DESC for ascending (by increasing value), true or SORT_ASC for descending (by decreasing value).
37			* @param int $sortFlags Sort flags for array_multisort.
38			* @param bool $isReversed Whether comparer result needs to be negated (used in usort).
39			* @param callable $keySelector {(v, k) ==> key} A function to extract a key from an element.
40			* @param callable $comparer {(a, b) ==> diff} Difference between a and b: <0 if a<b; 0 if a==b; >0 if a>b
41			* @param \YaLinqo\OrderedEnumerable $parent
42			*/
43			public function __construct($source, $sortOrder, $sortFlags, $isReversed, $keySelector, $comparer, $parent = null)
44			{
45			$this->source = $source;
46			$this->sortOrder = $sortOrder;
47			$this->sortFlags = $sortFlags;
48			$this->isReversed = $isReversed;
49			$this->keySelector = $keySelector;
50			$this->comparer = $comparer;
51			$this->parent = $parent;
52			}
53
54			private function getSingleComparer()
55			{
56			$comparer = $this->comparer;
57			if ($this->isReversed)
58			$comparer = function($a, $b) use ($comparer) { return -$comparer($a, $b); };
59			return $comparer;
60			}
61
62			/**
63			* <p><b>Syntax</b>: thenByDir (false\|true [, {{(v, k) ==> key} [, {{(a, b) ==> diff}]])
64			* <p>Performs a subsequent ordering of elements in a sequence in a particular direction (ascending, descending) according to a key.
65			* <p>Three methods are defined to extend the type OrderedEnumerable, which is the return type of this method. These three methods, namely {@link thenBy}, {@link thenByDescending} and {@link thenByDir}, enable you to specify additional sort criteria to sort a sequence. These methods also return an OrderedEnumerable, which means any number of consecutive calls to thenBy, thenByDescending or thenByDir can be made.
66			* <p>Because OrderedEnumerable inherits from {@link Enumerable}, you can call {@link Enumerable::orderBy orderBy}, {@link Enumerable::orderByDescending orderByDescending} or {@link Enumerable::orderByDir orderByDir} on the results of a call to orderBy, orderByDescending, orderByDir, thenBy, thenByDescending or thenByDir. Doing this introduces a new primary ordering that ignores the previously established ordering.
67			* <p>This method performs an unstable sort; that is, if the keys of two elements are equal, the order of the elements is not preserved. In contrast, a stable sort preserves the order of elements that have the same key. Internally, {@link usort} is used.
68			* @param int\|bool $sortOrder A direction in which to order the elements: false or SORT_DESC for ascending (by increasing value), true or SORT_ASC for descending (by decreasing value).
69			* @param callable\|null $keySelector {(v, k) ==> key} A function to extract a key from an element. Default: value.
70			* @param callable\|int\|null $comparer {(a, b) ==> diff} Difference between a and b: <0 if a<b; 0 if a==b; >0 if a>b. Can also be a combination of SORT_ flags.
71			* @return \YaLinqo\OrderedEnumerable
72			*/
73			public function thenByDir($sortOrder, $keySelector = null, $comparer = null): OrderedEnumerable
74			{
75			$sortFlags = Utils::lambdaToSortFlagsAndOrder($comparer, $sortOrder);
76			$keySelector = Utils::createLambda($keySelector, 'v,k', Functions::$value);
77			$isReversed = $sortOrder == SORT_DESC;
78			$comparer = Utils::createComparer($comparer, $sortOrder, $isReversed);
			0 ignored issues – show Bug introduced 2016-03-03 18:18 UTC by Report Bug Copy Issue Report It seems like `$sortOrder` defined by parameter `$sortOrder` on line 73 can also be of type `boolean`; however, `YaLinqo\Utils::createComparer()` does only seem to accept `integer`, maybe add an additional type check? This check looks at variables that have been passed in as parameters and are passed out again to other methods. If the outgoing method call has stricter type requirements than the method itself, an issue is raised. An additional type check may prevent trouble. Loading history...
79			return new self($this->source, $sortOrder, $sortFlags, $isReversed, $keySelector, $comparer, $this);
			0 ignored issues – show Bug introduced 2016-03-03 18:18 UTC by Report Bug Copy Issue Report It seems like `$sortFlags` defined by `\YaLinqo\Utils::lambdaTo...($comparer, $sortOrder)` on line `75` can also be of type `callable` or `null`; however, `YaLinqo\OrderedEnumerable::__construct()` does only seem to accept `integer`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string / function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history... Bug introduced 2016-08-24 11:17 UTC by Report Bug Copy Issue Report It seems like `$keySelector` defined by `\YaLinqo\Utils::createLa...inqo\Functions::$value)` on line `76` can also be of type `null`; however, `YaLinqo\OrderedEnumerable::__construct()` does only seem to accept `callable`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /* * @return array\|string / function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history... Bug introduced 2016-08-24 11:17 UTC by Report Bug Copy Issue Report It seems like `$comparer` defined by `\YaLinqo\Utils::createCo...sortOrder, $isReversed)` on line `78` can also be of type `null`; however, `YaLinqo\OrderedEnumerable::__construct()` does only seem to accept `callable`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /* * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
80			}
81
82			/**
83			* <p><b>Syntax</b>: thenBy ([{{(v, k) ==> key} [, {{(a, b) ==> diff}]])
84			* <p>Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.
85			* <p>Three methods are defined to extend the type OrderedEnumerable, which is the return type of this method. These three methods, namely {@link thenBy}, {@link thenByDescending} and {@link thenByDir}, enable you to specify additional sort criteria to sort a sequence. These methods also return an OrderedEnumerable, which means any number of consecutive calls to thenBy, thenByDescending or thenByDir can be made.
86			* <p>Because OrderedEnumerable inherits from {@link Enumerable}, you can call {@link Enumerable::orderBy orderBy}, {@link Enumerable::orderByDescending orderByDescending} or {@link Enumerable::orderByDir orderByDir} on the results of a call to orderBy, orderByDescending, orderByDir, thenBy, thenByDescending or thenByDir. Doing this introduces a new primary ordering that ignores the previously established ordering.
87			* <p>This method performs an unstable sort; that is, if the keys of two elements are equal, the order of the elements is not preserved. In contrast, a stable sort preserves the order of elements that have the same key. Internally, {@link usort} is used.
88			* @param callable\|null $keySelector {(v, k) ==> key} A function to extract a key from an element. Default: value.
89			* @param callable\|int\|null $comparer {(a, b) ==> diff} Difference between a and b: <0 if a<b; 0 if a==b; >0 if a>b. Can also be a combination of SORT_ flags.
90			* @return \YaLinqo\OrderedEnumerable
91			*/
92			public function thenBy($keySelector = null, $comparer = null): OrderedEnumerable
93			{
94			return $this->thenByDir(false, $keySelector, $comparer);
95			}
96
97			/**
98			* <p><b>Syntax</b>: thenByDescending ([{{(v, k) ==> key} [, {{(a, b) ==> diff}]])
99			* <p>Performs a subsequent ordering of the elements in a sequence in descending order according to a key.
100			* <p>Three methods are defined to extend the type OrderedEnumerable, which is the return type of this method. These three methods, namely {@link thenBy}, {@link thenByDescending} and {@link thenByDir}, enable you to specify additional sort criteria to sort a sequence. These methods also return an OrderedEnumerable, which means any number of consecutive calls to thenBy, thenByDescending or thenByDir can be made.
101			* <p>Because OrderedEnumerable inherits from {@link Enumerable}, you can call {@link Enumerable::orderBy orderBy}, {@link Enumerable::orderByDescending orderByDescending} or {@link Enumerable::orderByDir orderByDir} on the results of a call to orderBy, orderByDescending, orderByDir, thenBy, thenByDescending or thenByDir. Doing this introduces a new primary ordering that ignores the previously established ordering.
102			* <p>This method performs an unstable sort; that is, if the keys of two elements are equal, the order of the elements is not preserved. In contrast, a stable sort preserves the order of elements that have the same key. Internally, {@link usort} is used.
103			* @param callable\|null $keySelector {(v, k) ==> key} A function to extract a key from an element. Default: value.
104			* @param callable\|int\|null $comparer {(a, b) ==> diff} Difference between a and b: <0 if a<b; 0 if a==b; >0 if a>b. Can also be a combination of SORT_ flags.
105			* @return \YaLinqo\OrderedEnumerable
106			*/
107			public function thenByDescending($keySelector = null, $comparer = null): OrderedEnumerable
108			{
109			return $this->thenByDir(true, $keySelector, $comparer);
110			}
111
112			/** {@inheritdoc} */
113			public function getIterator(): \Traversable
114			{
115			$canMultisort = $this->sortFlags !== null;
116			$array = $this->source->tryGetArrayCopy();
117
118			$it = $this->trySortBySingleField($array, $canMultisort);
119			if ($it !== null)
120			return $it;
121
122			return $this->sortByMultipleFields($array, $canMultisort);
123			}
124
125			private function trySortBySingleField($array, bool $canMultisort)
126			{
127			if ($this->parent !== null \|\| $array === null) {
128			return null;
129			}
130			elseif ($this->keySelector === Functions::$value) {
131			if (!$canMultisort)
132			uasort($array, $this->getSingleComparer());
133			elseif ($this->sortOrder == SORT_ASC)
134			asort($array, $this->sortFlags);
135			else
136			arsort($array, $this->sortFlags);
137			}
138			elseif ($this->keySelector === Functions::$key) {
139			if ($canMultisort)
140			uksort($array, $this->getSingleComparer());
141			elseif ($this->sortOrder == SORT_ASC)
142			ksort($array, $this->sortFlags);
143			else
144			krsort($array, $this->sortFlags);
145			}
146			else {
147			return null;
148			}
149			return new \ArrayIterator($array);
150			}
151
152			private function sortByMultipleFields($array, bool $canMultisort)
153			{
154			$orders = [];
155			for ($order = $this; $order !== null; $order = $order->parent) {
156			$orders[] = $order;
157			if ($order->sortFlags === null)
158			$canMultisort = false;
159			}
160			$orders = array_reverse($orders);
161
162			$it = $this->trySortArrayWithMultisort($array, $orders, $canMultisort);
163			if ($it !== null)
164			return $it;
165
166			return $this->sortIterator($orders, $canMultisort);
167			}
168
169			private function sortIterator(array $orders, bool $canMultisort)
170			{
171			$enum = [];
172			if ($canMultisort)
173			$this->sortIteratorWithMultisort($enum, $orders);
174			else
175			$this->sortIteratorWithUsort($enum, $orders);
176
177			foreach ($enum as $pair)
178			yield $pair[0] => $pair[1];
179			}
180
181			private function trySortArrayWithMultisort($array, array $orders, bool $canMultisort)
182			{
183			/** @var $order OrderedEnumerable */
184			if ($array === null \|\| !$canMultisort)
185			return null;
186
187			$args = [];
188			foreach ($orders as $order) {
189			$column = [];
190			foreach ($array as $k => $v) {
191			$keySelector = $order->keySelector;
192			$column[$k] = $keySelector($v, $k);
193			}
194			$args[] = $column;
195			$args[] = $order->sortOrder;
196			$args[] = $order->sortFlags;
197			}
198			$args[] = &$array;
199
200			call_user_func_array('array_multisort', $args);
201
202			return new \ArrayIterator($array);
203			}
204
205			private function sortIteratorWithMultisort(&$enum, array $orders)
206			{
207			/** @var $order OrderedEnumerable */
208			foreach ($this->source as $k => $v)
209			$enum[] = [ $k, $v ];
210
211			$args = [];
212			foreach ($orders as $order) {
213			$column = [];
214			foreach ($enum as $k => $pair) {
215			$keySelector = $order->keySelector;
216			$column[$k] = $keySelector($pair[1], $pair[0]);
217			}
218			$args[] = $column;
219			$args[] = $order->sortOrder;
220			$args[] = $order->sortFlags;
221			}
222			$args[] = &$enum;
223
224			call_user_func_array('array_multisort', $args);
225			}
226
227			private function sortIteratorWithUsort(&$enum, array $orders)
228			{
229			/** @var $order OrderedEnumerable */
230			foreach ($this->source as $k => $v) {
231			$element = [ $k, $v ];
232			foreach ($orders as $order) {
233			$keySelector = $order->keySelector;
234			$element[] = $keySelector($v, $k);
235			}
236			$enum[] = $element;
237			}
238
239			usort($enum, function($a, $b) use ($orders) {
240			/** @var $order OrderedEnumerable */
241			$count = count($orders);
242			for ($i = 0; $i < $count; $i++) {
243			$order = $orders[$i];
244			$comparer = $order->comparer;
245			$diff = $comparer($a[$i + 2], $b[$i + 2]);
246			if ($diff != 0)
247			return $order->isReversed ? -$diff : $diff;
248			}
249			return 0;
250			});
251			}
252			}
253

Athari / YaLinqo

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OrderedEnumerable::getIterator() A last analyzed 2018-05-11 22:32 UTC

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OrderedEnumerable::getIterator() A
last analyzed 2018-05-11 22:32 UTC