PseudoClass::isNthChild() - Code Metrics - arthurkushman/querypath - Measure and Improve Code Quality continuously with Scrutinizer

PseudoClass::isNthChild() B
last analyzed 2022-03-28 08:12 UTC

↳ Parent: PseudoClass

Complexity

Conditions	10
Paths	11

Size

Total Lines	31
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	10
eloc	16
c	1
b	0
f	0
nc	11
nop	4
dl	0
loc	31
rs	7.6666

How to fix Complexity

<?php
/**
 * @file
 *
 * PseudoClass class.
 *
 * This is the first pass in an experiment to break PseudoClass handling
 * out of the normal traversal. Eventually, this should become a
 * top-level pluggable registry that will allow custom pseudoclasses.
 * For now, though, we just handle the core pseudoclasses.
 */

namespace QueryPath\CSS\DOMTraverser;

use \QueryPath\CSS\NotImplementedException;
use \QueryPath\CSS\EventHandler;
use QueryPath\CSS\ParseException;

/**
 *  The PseudoClass handler.
 *
 */
class PseudoClass
{

    /**
     * Tests whether the given element matches the given pseudoclass.
     *
     * @param string $pseudoclass
     *   The string name of the pseudoclass
     * @param resource $node
     *   The DOMNode to be tested.
     * @param resource $scope
     *   The DOMElement that is the active root for this node.
     * @param mixed $value
     *   The optional value string provided with this class. This is
     *   used, for example, in an+b psuedoclasses.
     * @return bool
     * @throws NotImplementedException
     * @throws \QueryPath\CSS\ParseException
     * @retval boolean
     *   TRUE if the node matches, FALSE otherwise.
     */
    public function elementMatches($pseudoclass, $node, $scope, $value = NULL)
    {
        $name = strtolower($pseudoclass);
        // Need to handle known pseudoclasses.
        switch ($name) {
            case 'current':
            case 'past':
            case 'future':
            case 'visited':
            case 'hover':
            case 'active':
            case 'focus':
            case 'animated': //  Last 3 are from jQuery
            case 'visible':
            case 'hidden':
                // These require a UA, which we don't have.
            case 'valid':
            case 'invalid':
            case 'required':
            case 'optional':
            case 'read-only':
            case 'read-write':
                // Since we don't know how to validate elements,
                // we can't supply these.
            case 'dir':
                // FIXME: I don't know how to get directionality info.
            case 'nth-column':
            case 'nth-last-column':
                // We don't know what a column is in most documents.
                // FIXME: Can we do this for HTML?
            case 'target':
                // This requires a location URL, which we don't have.
                return false;
            case 'indeterminate':
                // Because sometimes screwing with people is fun.
                return (boolean)mt_rand(0, 1);
            case 'lang':
                // No value = exception.
                if (!isset($value)) {
                    throw new NotImplementedException(':lang() requires a value.');
                }

                return $this->lang($node, $value);
            case 'any-link':
                return Util::matchesAttribute($node, 'href')
                    || Util::matchesAttribute($node, 'src')
                    || Util::matchesAttribute($node, 'link');
            case 'link':
                return Util::matchesAttribute($node, 'href');
            case 'local-link':
                return $this->isLocalLink($node);
            case 'root':
                return $node->isSameNode($node->ownerDocument->documentElement);

            // CSS 4 declares the :scope pseudo-class, which describes what was
            // the :x-root QueryPath extension.
            case 'x-root':
            case 'x-reset':
            case 'scope':
                return $node->isSameNode($scope);
            // NON-STANDARD extensions for simple support of even and odd. These
            // are supported by jQuery, FF, and other user agents.
            case 'even':
                return $this->isNthChild($node, 'even');
            case 'odd':
                return $this->isNthChild($node, 'odd');
            case 'nth-child':
                return $this->isNthChild($node, $value);
            case 'nth-last-child':
                return $this->isNthChild($node, $value, true);
            case 'nth-of-type':
                return $this->isNthChild($node, $value, false, true);
            case 'nth-last-of-type':
                return $this->isNthChild($node, $value, true, true);
            case 'first-of-type':
                return $this->isFirstOfType($node);
            case 'last-of-type':
                return $this->isLastOfType($node);
            case 'only-of-type':
                return $this->isFirstOfType($node) && $this->isLastOfType($node);

            // Additional pseudo-classes defined in jQuery:
            case 'lt':
                // I'm treating this as "less than or equal to".
                $rule = sprintf('-n + %d', (int)$value);

                // $rule = '-n+15';
                return $this->isNthChild($node, $rule);
            case 'gt':
                // I'm treating this as "greater than"
                // return $this->nodePositionFromEnd($node) > (int) $value;
                return $this->nodePositionFromStart($node) > (int)$value;
            case 'nth':
            case 'eq':
                $rule = (int)$value;

                return $this->isNthChild($node, $rule);
            case 'first':
                return $this->isNthChild($node, 1);
            case 'first-child':
                return $this->isFirst($node);
            case 'last':
            case 'last-child':
                return $this->isLast($node);
            case 'only-child':
                return $this->isFirst($node) && $this->isLast($node);
            case 'empty':
                return $this->isEmpty($node);
            case 'parent':
                return !$this->isEmpty($node);

            case 'enabled':
            case 'disabled':
            case 'checked':
                return Util::matchesAttribute($node, $name);
            case 'text':
            case 'radio':
            case 'checkbox':
            case 'file':
            case 'password':
            case 'submit':
            case 'image':
            case 'reset':
            case 'button':
                return Util::matchesAttribute($node, 'type', $name);

            case 'header':
                return $this->header($node);
            case 'has':
            case 'matches':
                return $this->has($node, $value);
                break;
switch ($x) {
    case 1:
        return 'foo';
        break; // This break is not necessary and can be left off.
}
            case 'not':
                if (empty($value)) {
                    throw new ParseException(':not() requires a value.');
                }

                return $this->isNot($node, $value);
            // Contains == text matches.
            // In QP 2.1, this was changed.
            case 'contains':
                return $this->contains($node, $value);
            // Since QP 2.1
            case 'contains-exactly':
                return $this->containsExactly($node, $value);
            default:
                throw new ParseException('Unknown Pseudo-Class: ' . $name);
        }
    }

    /**
     * Pseudo-class handler for :lang
     *
     * Note that this does not implement the spec in its entirety because we do
     * not presume to "know the language" of the document. If anyone is interested
     * in making this more intelligent, please do so.
     */
    protected function lang($node, $value)
    {
        // TODO: This checks for cases where an explicit language is
        // set. The spec seems to indicate that an element should inherit
        // language from the parent... but this is unclear.
        $operator = (strpos($value, '-') !== false) ? EventHandler::IS_EXACTLY : EventHandler::CONTAINS_WITH_HYPHEN;

        $match = true;

        foreach ($node->attributes as $attrNode) {
            if ($attrNode->localName === 'lang') {

                if ($attrNode->nodeName === $attrNode->localName) {
                    // fprintf(STDOUT, "%s in NS %s\n", $attrNode->name, $attrNode->nodeName);
                    return Util::matchesAttribute($node, 'lang', $value, $operator);
                }

                $nsuri = $attrNode->namespaceURI;
                // fprintf(STDOUT, "%s in NS %s\n", $attrNode->name, $nsuri);
                return Util::matchesAttributeNS($node, 'lang', $nsuri, $value, $operator);
            }
        }

        return false;
    }

    /**
     * Provides jQuery pseudoclass ':header'.
     *
     * @param $node
     * @return bool
     */
    protected function header($node): bool
    {
        return preg_match('/^h[1-9]$/i', $node->tagName) === 1;
    }

    /**
     * Provides pseudoclass :empty.
     */
    protected function isEmpty($node): bool
    {
        foreach ($node->childNodes as $kid) {
            // We don't want to count PIs and comments. From the spec, it
            // appears that CDATA is also not counted.
            if ($kid->nodeType === XML_ELEMENT_NODE || $kid->nodeType === XML_TEXT_NODE) {
                // As soon as we hit a FALSE, return.
                return false;
            }
        }

        return true;
    }

    /**
     * Provides jQuery pseudoclass :first.
     *
     * @todo
     *   This can be replaced by isNthChild().
     */
    protected function isFirst($node): bool
    {
        while (isset($node->previousSibling)) {
            $node = $node->previousSibling;
            if ($node->nodeType === XML_ELEMENT_NODE) {
                return false;
            }
        }

        return true;
    }

    /**
     * Fast version of first-of-type.
     */
    protected function isFirstOfType($node)
    {
        $type = $node->tagName;
        while (isset($node->previousSibling)) {
            $node = $node->previousSibling;
            if ($node->nodeType === XML_ELEMENT_NODE && $node->tagName === $type) {
                return false;
            }
        }

        return true;
    }

    /**
     * Fast version of jQuery :last.
     */
    protected function isLast($node)
    {
        while (isset($node->nextSibling)) {
            $node = $node->nextSibling;
            if ($node->nodeType === XML_ELEMENT_NODE) {
                return false;
            }
        }

        return true;
    }

    /**
     * Provides last-of-type.
     */
    protected function isLastOfType($node)
    {
        $type = $node->tagName;
        while (isset($node->nextSibling)) {
            $node = $node->nextSibling;
            if ($node->nodeType === XML_ELEMENT_NODE && $node->tagName === $type) {
                return false;
            }
        }

        return true;
    }

    /**
     * Provides :contains() as the original spec called for.
     *
     * This is an INEXACT match.
     */
    protected function contains($node, $value): bool
    {
        $text = $node->textContent;
        $value = Util::removeQuotes($value);

        return isset($text) && (stripos($text, $value) !== false);
    }

    /**
     * Provides :contains-exactly QueryPath pseudoclass.
     *
     * This is an EXACT match.
     */
    protected function containsExactly($node, $value): bool
    {
        $text = $node->textContent;
        $value = Util::removeQuotes($value);

        return isset($text) && $text == $value;
    }

    /**
     * Provides :has pseudoclass.
     *
     * @throws ParseException
     */
    protected function has($node, $selector): bool
    {
        $splos = new \SPLObjectStorage();
        $splos->attach($node);
        $traverser = new \QueryPath\CSS\DOMTraverser($splos, true);
        $results = $traverser->find($selector)->matches();

        return count($results) > 0;
    }

    /**
     * Provides :not pseudoclass.
     *
     * @throws ParseException
     */
    protected function isNot($node, $selector): bool
    {
        return !$this->has($node, $selector);
    }

    /**
     * Get the relative position of a node in its sibling set.
     */
    protected function nodePositionFromStart($node, $byType = false): int
    {
        $i = 1;
        $tag = $node->tagName;
        while (isset($node->previousSibling)) {
            $node = $node->previousSibling;
            if ($node->nodeType === XML_ELEMENT_NODE && (!$byType || $node->tagName === $tag)) {
                ++$i;
            }
        }

        return $i;
    }

    /**
     * Get the relative position of a node in its sibling set.
     *
     * @param $node
     * @param bool $byType
     * @return int
     */
    protected function nodePositionFromEnd($node, $byType = false): int
    {
        $i = 1;
        $tag = $node->tagName;
        while (isset($node->nextSibling)) {
            $node = $node->nextSibling;
            if ($node->nodeType === XML_ELEMENT_NODE && (!$byType || $node->tagName === $tag)) {
                ++$i;
            }
        }

        return $i;
    }

    /**
     * Provides functionality for all "An+B" rules.
     * Provides nth-child and also the functionality required for:
     *
     *- nth-last-child
     *- even
     *- odd
     *- first
     *- last
     *- eq
     *- nth
     *- nth-of-type
     *- first-of-type
     *- last-of-type
     *- nth-last-of-type
     *
     * See also QueryPath::CSS::DOMTraverser::Util::parseAnB().
     *
     * @param $node
     * @param $value
     * @param bool $reverse
     * @param bool $byType
     * @return bool
     */
    protected function isNthChild($node, $value, $reverse = false, $byType = false): bool
    {
        list($groupSize, $elementInGroup) = Util::parseAnB($value);
        $parent = $node->parentNode;
        if (empty($parent)
            || ($groupSize === 0 && $elementInGroup === 0)
            || ($groupSize > 0 && $elementInGroup > $groupSize)
        ) {
            return false;
        }

        // First we need to find the position of $node in other elements.
        if ($reverse) {
            $pos = $this->nodePositionFromEnd($node, $byType);
        } else {
            $pos = $this->nodePositionFromStart($node, $byType);
        }

        // If group size is 0, we just check to see if this
        // is the nth element:
        if ($groupSize === 0) {
            return $pos === $elementInGroup;
        }

        // Next, we normalize $elementInGroup
        if ($elementInGroup < 0) {
            $elementInGroup = $groupSize + $elementInGroup;
        }
        $prod = ($pos - $elementInGroup) / $groupSize;

        return is_int($prod) && $prod >= 0;
    }

    protected function isLocalLink($node): bool
    {
        if (!$node->hasAttribute('href')) {
            return false;
        }
        $url = $node->getAttribute('href');
        $scheme = parse_url($url, PHP_URL_SCHEME);

        return empty($scheme) || $scheme === 'file';
    }

}


1			<?php
2			/**
3			* @file
4			*
5			* PseudoClass class.
6			*
7			* This is the first pass in an experiment to break PseudoClass handling
8			* out of the normal traversal. Eventually, this should become a
9			* top-level pluggable registry that will allow custom pseudoclasses.
10			* For now, though, we just handle the core pseudoclasses.
11			*/
12
13			namespace QueryPath\CSS\DOMTraverser;
14
15			use \QueryPath\CSS\NotImplementedException;
16			use \QueryPath\CSS\EventHandler;
17			use QueryPath\CSS\ParseException;
18
19			/**
20			* The PseudoClass handler.
21			*
22			*/
23			class PseudoClass
24			{
25
26			/**
27			* Tests whether the given element matches the given pseudoclass.
28			*
29			* @param string $pseudoclass
30			* The string name of the pseudoclass
31			* @param resource $node
32			* The DOMNode to be tested.
33			* @param resource $scope
34			* The DOMElement that is the active root for this node.
35			* @param mixed $value
36			* The optional value string provided with this class. This is
37			* used, for example, in an+b psuedoclasses.
38			* @return bool
39			* @throws NotImplementedException
40			* @throws \QueryPath\CSS\ParseException
41			* @retval boolean
42			* TRUE if the node matches, FALSE otherwise.
43			*/
44			public function elementMatches($pseudoclass, $node, $scope, $value = NULL)
45			{
46			$name = strtolower($pseudoclass);
47			// Need to handle known pseudoclasses.
48			switch ($name) {
49			case 'current':
50			case 'past':
51			case 'future':
52			case 'visited':
53			case 'hover':
54			case 'active':
55			case 'focus':
56			case 'animated': // Last 3 are from jQuery
57			case 'visible':
58			case 'hidden':
59			// These require a UA, which we don't have.
60			case 'valid':
61			case 'invalid':
62			case 'required':
63			case 'optional':
64			case 'read-only':
65			case 'read-write':
66			// Since we don't know how to validate elements,
67			// we can't supply these.
68			case 'dir':
69			// FIXME: I don't know how to get directionality info.
70			case 'nth-column':
71			case 'nth-last-column':
72			// We don't know what a column is in most documents.
73			// FIXME: Can we do this for HTML?
74			case 'target':
75			// This requires a location URL, which we don't have.
76			return false;
77			case 'indeterminate':
78			// Because sometimes screwing with people is fun.
79			return (boolean)mt_rand(0, 1);
80			case 'lang':
81			// No value = exception.
82			if (!isset($value)) {
83			throw new NotImplementedException(':lang() requires a value.');
84			}
85
86			return $this->lang($node, $value);
87			case 'any-link':
88			return Util::matchesAttribute($node, 'href')
89			\|\| Util::matchesAttribute($node, 'src')
90			\|\| Util::matchesAttribute($node, 'link');
91			case 'link':
92			return Util::matchesAttribute($node, 'href');
93			case 'local-link':
94			return $this->isLocalLink($node);
95			case 'root':
96			return $node->isSameNode($node->ownerDocument->documentElement);
97
98			// CSS 4 declares the :scope pseudo-class, which describes what was
99			// the :x-root QueryPath extension.
100			case 'x-root':
101			case 'x-reset':
102			case 'scope':
103			return $node->isSameNode($scope);
104			// NON-STANDARD extensions for simple support of even and odd. These
105			// are supported by jQuery, FF, and other user agents.
106			case 'even':
107			return $this->isNthChild($node, 'even');
108			case 'odd':
109			return $this->isNthChild($node, 'odd');
110			case 'nth-child':
111			return $this->isNthChild($node, $value);
112			case 'nth-last-child':
113			return $this->isNthChild($node, $value, true);
114			case 'nth-of-type':
115			return $this->isNthChild($node, $value, false, true);
116			case 'nth-last-of-type':
117			return $this->isNthChild($node, $value, true, true);
118			case 'first-of-type':
119			return $this->isFirstOfType($node);
120			case 'last-of-type':
121			return $this->isLastOfType($node);
122			case 'only-of-type':
123			return $this->isFirstOfType($node) && $this->isLastOfType($node);
124
125			// Additional pseudo-classes defined in jQuery:
126			case 'lt':
127			// I'm treating this as "less than or equal to".
128			$rule = sprintf('-n + %d', (int)$value);
129
130			// $rule = '-n+15';
131			return $this->isNthChild($node, $rule);
132			case 'gt':
133			// I'm treating this as "greater than"
134			// return $this->nodePositionFromEnd($node) > (int) $value;
135			return $this->nodePositionFromStart($node) > (int)$value;
136			case 'nth':
137			case 'eq':
138			$rule = (int)$value;
139
140			return $this->isNthChild($node, $rule);
141			case 'first':
142			return $this->isNthChild($node, 1);
143			case 'first-child':
144			return $this->isFirst($node);
145			case 'last':
146			case 'last-child':
147			return $this->isLast($node);
148			case 'only-child':
149			return $this->isFirst($node) && $this->isLast($node);
150			case 'empty':
151			return $this->isEmpty($node);
152			case 'parent':
153			return !$this->isEmpty($node);
154
155			case 'enabled':
156			case 'disabled':
157			case 'checked':
158			return Util::matchesAttribute($node, $name);
159			case 'text':
160			case 'radio':
161			case 'checkbox':
162			case 'file':
163			case 'password':
164			case 'submit':
165			case 'image':
166			case 'reset':
167			case 'button':
168			return Util::matchesAttribute($node, 'type', $name);
169
170			case 'header':
171			return $this->header($node);
172			case 'has':
173			case 'matches':
174			return $this->has($node, $value);
175			break;
			0 ignored issues – show Unused Code introduced 2018-07-29 16:29 UTC by Report Bug Copy Issue Report `break` is not strictly necessary here and could be removed. The `break` statement is not necessary if it is preceded for example by a `return` statement: switch ($x) { case 1: return 'foo'; break; // This break is not necessary and can be left off. } If you would like to keep this construct to be consistent with other `case` statements, you can safely mark this issue as a false-positive. Loading history...
176			case 'not':
177			if (empty($value)) {
178			throw new ParseException(':not() requires a value.');
179			}
180
181			return $this->isNot($node, $value);
182			// Contains == text matches.
183			// In QP 2.1, this was changed.
184			case 'contains':
185			return $this->contains($node, $value);
186			// Since QP 2.1
187			case 'contains-exactly':
188			return $this->containsExactly($node, $value);
189			default:
190			throw new ParseException('Unknown Pseudo-Class: ' . $name);
191			}
192			}
193
194			/**
195			* Pseudo-class handler for :lang
196			*
197			* Note that this does not implement the spec in its entirety because we do
198			* not presume to "know the language" of the document. If anyone is interested
199			* in making this more intelligent, please do so.
200			*/
201			protected function lang($node, $value)
202			{
203			// TODO: This checks for cases where an explicit language is
204			// set. The spec seems to indicate that an element should inherit
205			// language from the parent... but this is unclear.
206			$operator = (strpos($value, '-') !== false) ? EventHandler::IS_EXACTLY : EventHandler::CONTAINS_WITH_HYPHEN;
207
208			$match = true;
			0 ignored issues – show Unused Code introduced 2018-07-29 16:29 UTC by Report Bug Copy Issue Report The assignment to `$match` is dead and can be removed. Loading history...
209			foreach ($node->attributes as $attrNode) {
210			if ($attrNode->localName === 'lang') {
211
212			if ($attrNode->nodeName === $attrNode->localName) {
213			// fprintf(STDOUT, "%s in NS %s\n", $attrNode->name, $attrNode->nodeName);
214			return Util::matchesAttribute($node, 'lang', $value, $operator);
215			}
216
217			$nsuri = $attrNode->namespaceURI;
218			// fprintf(STDOUT, "%s in NS %s\n", $attrNode->name, $nsuri);
219			return Util::matchesAttributeNS($node, 'lang', $nsuri, $value, $operator);
220			}
221			}
222
223			return false;
224			}
225
226			/**
227			* Provides jQuery pseudoclass ':header'.
228			*
229			* @param $node
230			* @return bool
231			*/
232			protected function header($node): bool
233			{
234			return preg_match('/^h[1-9]$/i', $node->tagName) === 1;
235			}
236
237			/**
238			* Provides pseudoclass :empty.
239			*/
240			protected function isEmpty($node): bool
241			{
242			foreach ($node->childNodes as $kid) {
243			// We don't want to count PIs and comments. From the spec, it
244			// appears that CDATA is also not counted.
245			if ($kid->nodeType === XML_ELEMENT_NODE \|\| $kid->nodeType === XML_TEXT_NODE) {
246			// As soon as we hit a FALSE, return.
247			return false;
248			}
249			}
250
251			return true;
252			}
253
254			/**
255			* Provides jQuery pseudoclass :first.
256			*
257			* @todo
258			* This can be replaced by isNthChild().
259			*/
260			protected function isFirst($node): bool
261			{
262			while (isset($node->previousSibling)) {
263			$node = $node->previousSibling;
264			if ($node->nodeType === XML_ELEMENT_NODE) {
265			return false;
266			}
267			}
268
269			return true;
270			}
271
272			/**
273			* Fast version of first-of-type.
274			*/
275			protected function isFirstOfType($node)
276			{
277			$type = $node->tagName;
278			while (isset($node->previousSibling)) {
279			$node = $node->previousSibling;
280			if ($node->nodeType === XML_ELEMENT_NODE && $node->tagName === $type) {
281			return false;
282			}
283			}
284
285			return true;
286			}
287
288			/**
289			* Fast version of jQuery :last.
290			*/
291			protected function isLast($node)
292			{
293			while (isset($node->nextSibling)) {
294			$node = $node->nextSibling;
295			if ($node->nodeType === XML_ELEMENT_NODE) {
296			return false;
297			}
298			}
299
300			return true;
301			}
302
303			/**
304			* Provides last-of-type.
305			*/
306			protected function isLastOfType($node)
307			{
308			$type = $node->tagName;
309			while (isset($node->nextSibling)) {
310			$node = $node->nextSibling;
311			if ($node->nodeType === XML_ELEMENT_NODE && $node->tagName === $type) {
312			return false;
313			}
314			}
315
316			return true;
317			}
318
319			/**
320			* Provides :contains() as the original spec called for.
321			*
322			* This is an INEXACT match.
323			*/
324			protected function contains($node, $value): bool
325			{
326			$text = $node->textContent;
327			$value = Util::removeQuotes($value);
328
329			return isset($text) && (stripos($text, $value) !== false);
330			}
331
332			/**
333			* Provides :contains-exactly QueryPath pseudoclass.
334			*
335			* This is an EXACT match.
336			*/
337			protected function containsExactly($node, $value): bool
338			{
339			$text = $node->textContent;
340			$value = Util::removeQuotes($value);
341
342			return isset($text) && $text == $value;
343			}
344
345			/**
346			* Provides :has pseudoclass.
347			*
348			* @throws ParseException
349			*/
350			protected function has($node, $selector): bool
351			{
352			$splos = new \SPLObjectStorage();
353			$splos->attach($node);
354			$traverser = new \QueryPath\CSS\DOMTraverser($splos, true);
355			$results = $traverser->find($selector)->matches();
356
357			return count($results) > 0;
358			}
359
360			/**
361			* Provides :not pseudoclass.
362			*
363			* @throws ParseException
364			*/
365			protected function isNot($node, $selector): bool
366			{
367			return !$this->has($node, $selector);
368			}
369
370			/**
371			* Get the relative position of a node in its sibling set.
372			*/
373			protected function nodePositionFromStart($node, $byType = false): int
374			{
375			$i = 1;
376			$tag = $node->tagName;
377			while (isset($node->previousSibling)) {
378			$node = $node->previousSibling;
379			if ($node->nodeType === XML_ELEMENT_NODE && (!$byType \|\| $node->tagName === $tag)) {
380			++$i;
381			}
382			}
383
384			return $i;
385			}
386
387			/**
388			* Get the relative position of a node in its sibling set.
389			*
390			* @param $node
391			* @param bool $byType
392			* @return int
393			*/
394			protected function nodePositionFromEnd($node, $byType = false): int
395			{
396			$i = 1;
397			$tag = $node->tagName;
398			while (isset($node->nextSibling)) {
399			$node = $node->nextSibling;
400			if ($node->nodeType === XML_ELEMENT_NODE && (!$byType \|\| $node->tagName === $tag)) {
401			++$i;
402			}
403			}
404
405			return $i;
406			}
407
408			/**
409			* Provides functionality for all "An+B" rules.
410			* Provides nth-child and also the functionality required for:
411			*
412			*- nth-last-child
413			*- even
414			*- odd
415			*- first
416			*- last
417			*- eq
418			*- nth
419			*- nth-of-type
420			*- first-of-type
421			*- last-of-type
422			*- nth-last-of-type
423			*
424			* See also QueryPath::CSS::DOMTraverser::Util::parseAnB().
425			*
426			* @param $node
427			* @param $value
428			* @param bool $reverse
429			* @param bool $byType
430			* @return bool
431			*/
432			protected function isNthChild($node, $value, $reverse = false, $byType = false): bool
433			{
434			list($groupSize, $elementInGroup) = Util::parseAnB($value);
435			$parent = $node->parentNode;
436			if (empty($parent)
437			\|\| ($groupSize === 0 && $elementInGroup === 0)
438			\|\| ($groupSize > 0 && $elementInGroup > $groupSize)
439			) {
440			return false;
441			}
442
443			// First we need to find the position of $node in other elements.
444			if ($reverse) {
445			$pos = $this->nodePositionFromEnd($node, $byType);
446			} else {
447			$pos = $this->nodePositionFromStart($node, $byType);
448			}
449
450			// If group size is 0, we just check to see if this
451			// is the nth element:
452			if ($groupSize === 0) {
453			return $pos === $elementInGroup;
454			}
455
456			// Next, we normalize $elementInGroup
457			if ($elementInGroup < 0) {
458			$elementInGroup = $groupSize + $elementInGroup;
459			}
460			$prod = ($pos - $elementInGroup) / $groupSize;
461
462			return is_int($prod) && $prod >= 0;
463			}
464
465			protected function isLocalLink($node): bool
466			{
467			if (!$node->hasAttribute('href')) {
468			return false;
469			}
470			$url = $node->getAttribute('href');
471			$scheme = parse_url($url, PHP_URL_SCHEME);
472
473			return empty($scheme) \|\| $scheme === 'file';
474			}
475
476			}
477

arthurkushman / querypath

PseudoClass::isNthChild() B last analyzed 2022-03-28 08:12 UTC

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PseudoClass::isNthChild() B
last analyzed 2022-03-28 08:12 UTC