Selector::match() - Code Metrics - Inspection of "2.0.1" - paquettg/php-html-parser - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 8b759a...268bdc )

by Gilles

created 2019-02-02 18:51 UTC

Selector::match() B

↳ Parent: Selector

Complexity

Conditions	7
Paths	7

Size

Total Lines	22
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	20.2773

Importance

Changes

Metric	Value
cc	7
eloc	16
nc	7
nop	3
dl	0
loc	22
ccs	6
cts	17
cp	0.3529
crap	20.2773
rs	8.8333
c	0
b	0
f	0

<?php
namespace PHPHtmlParser;

use PHPHtmlParser\Dom\AbstractNode;
use PHPHtmlParser\Dom\Collection;
use PHPHtmlParser\Dom\InnerNode;
use PHPHtmlParser\Dom\LeafNode;
use PHPHtmlParser\Exceptions\ChildNotFoundException;
use Countable;

/**
 * Class Selector
 *
 * @package PHPHtmlParser
 */
class Selector
{

    /**
     * Pattern of CSS selectors, modified from 'mootools'
     *
     * @var string
     */
    protected $pattern = "/([\w\-:\*>]*)(?:\#([\w\-]+)|\.([\w\-]+))?(?:\[@?(!?[\w\-:]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";

    protected $selectors = [];

    /**
     * Constructs with the selector string
     *
     * @param string $selector
     */
    public function __construct($selector)
    {
        $this->parseSelectorString($selector);
    }

    /**
     * Returns the selectors that where found in __construct
     *
     * @return array
     */
    public function getSelectors()
    {
        return $this->selectors;
    }

    /**
     * Attempts to find the selectors starting from the given
     * node object.
     *
     * @param AbstractNode $node
     * @return Collection
     */
    public function find(AbstractNode $node): Collection
    {
        $results = new Collection;
        foreach ($this->selectors as $selector) {
            $nodes = [$node];
            if (count($selector) == 0) {
                continue;
            }

            $options = [];
            foreach ($selector as $rule) {
                if ($rule['alterNext']) {
                    $options[] = $this->alterNext($rule);
                    continue;
                }
                $nodes = $this->seek($nodes, $rule, $options);
                // clear the options
                $options = [];
            }

            // this is the final set of nodes
            foreach ($nodes as $result) {
                $results[] = $result;
            }
        }

        return $results;
    }

    /**
     * Parses the selector string
     *
     * @param string $selector
     */
    protected function parseSelectorString(string $selector): void
    {
        $matches = [];
        preg_match_all($this->pattern, trim($selector).' ', $matches, PREG_SET_ORDER);

        // skip tbody
        $result = [];
        foreach ($matches as $match) {
            // default values
            $tag       = strtolower(trim($match[1]));
            $operator  = '=';
            $key       = null;
            $value     = null;
            $noKey     = false;
            $alterNext = false;

            // check for elements that alter the behavior of the next element
            if ($tag == '>') {
                $alterNext = true;
            }

            // check for id selector
            if ( ! empty($match[2])) {
                $key   = 'id';
                $value = $match[2];
            }

            // check for class selector
            if ( ! empty($match[3])) {
                $key   = 'class';
                $value = $match[3];
            }

            // and final attribute selector
            if ( ! empty($match[4])) {
                $key = strtolower($match[4]);
            }
            if ( ! empty($match[5])) {
                $operator = $match[5];
            }
            if ( ! empty($match[6])) {
                $value = $match[6];
            }

            // check for elements that do not have a specified attribute
            if (isset($key[0]) && $key[0] == '!') {
                $key   = substr($key, 1);
                $noKey = true;
            }

            $result[] = [
                'tag'       => $tag,
                'key'       => $key,
                'value'     => $value,
                'operator'  => $operator,
                'noKey'     => $noKey,
                'alterNext' => $alterNext,
            ];
            if (trim($match[7]) == ',') {
                $this->selectors[] = $result;
                $result            = [];
            }
        }

        // save last results
        if (count($result) > 0) {
            $this->selectors[] = $result;
        }
    }

    /**
     * Attempts to find all children that match the rule
     * given.
     *
     * @param array $nodes
     * @param array $rule
     * @param array $options
     * @return array
     * @recursive
     */
    protected function seek(array $nodes, array $rule, array $options): array
    {
        // XPath index
        if (array_key_exists('tag', $rule) &&
            array_key_exists('key', $rule) &&
            is_numeric($rule['key'])
        ) {
            $count = 0;
            /** @var AbstractNode $node */
            foreach ($nodes as $node) {
                if ($rule['tag'] == '*' ||
                    $rule['tag'] == $node->getTag()->name()
                ) {
                    ++$count;
                    if ($count == $rule['key']) {
                        // found the node we wanted
                        return [$node];
                    }
                }
            }

            return [];
        }

        $options = $this->flattenOptions($options);

        $return = [];
        /** @var InnerNode $node */
        foreach ($nodes as $node) {
            // check if we are a leaf
            if ($node instanceof LeafNode ||
                ! $node->hasChildren()
            ) {
                continue;
            }

            $children = [];
            $child    = $node->firstChild();
            while ( ! is_null($child)) {
                // wild card, grab all
                if ($rule['tag'] == '*' && is_null($rule['key'])) {
                    $return[] = $child;
                    try {
                        $child = $node->nextChild($child->id());
                    } catch (ChildNotFoundException $e) {
                        // no more children
                        $child = null;
                    }
                    continue;
                }

                $pass = true;
                // check tag
                if ( ! empty($rule['tag']) && $rule['tag'] != $child->getTag()->name() &&
                    $rule['tag'] != '*'
                ) {
                    // child failed tag check
                    $pass = false;
                }

                // check key
                if ($pass && ! is_null($rule['key'])) {
                    if ($rule['noKey']) {
                        if ( ! is_null($child->getAttribute($rule['key']))) {
                            $pass = false;
                        }
                    } else {
                        if ($rule['key'] != 'plaintext' && !$child->hasAttribute($rule['key'])) {
                            $pass = false;
                        }
                    }
                }

                // compare values
                if ($pass && ! is_null($rule['key']) &&
                    ! is_null($rule['value']) && $rule['value'] != '*'
                ) {
                    if ($rule['key'] == 'plaintext') {
                        // plaintext search
                        $nodeValue = $child->text();
                    } else {
                        // normal search
                        $nodeValue = $child->getAttribute($rule['key']);
                    }

                    $check = $this->match($rule['operator'], $rule['value'], $nodeValue);

                    // handle multiple classes
                    if ( ! $check && $rule['key'] == 'class') {
                        $childClasses = explode(' ', $child->getAttribute('class'));
                        foreach ($childClasses as $class) {
                            if ( ! empty($class)) {
                                $check = $this->match($rule['operator'], $rule['value'], $class);
                            }
                            if ($check) {
                                break;
                            }
                        }
                    }

                    if ( ! $check) {
                        $pass = false;
                    }
                }

                if ($pass) {
                    // it passed all checks
                    $return[] = $child;
                } else {
                    // this child failed to be matched
                    if ($child instanceof InnerNode &&
                        $child->hasChildren()
                    ) {
                        // we still want to check its children
                        $children[] = $child;
                    }
                }

                try {
                    // get next child
                    $child = $node->nextChild($child->id());
                } catch (ChildNotFoundException $e) {
                    // no more children
                    $child = null;
                }
            }

            if (( ! isset($options['checkGrandChildren']) ||
                    $options['checkGrandChildren'])
                && count($children) > 0
            ) {
                // we have children that failed but are not leaves.
                $matches = $this->seek($children, $rule, $options);
                foreach ($matches as $match) {
                    $return[] = $match;
                }
            }
        }

        return $return;
    }

    /**
     * Attempts to match the given arguments with the given operator.
     *
     * @param string $operator
     * @param string $pattern
     * @param string $value
     * @return bool
     */
    protected function match(string $operator, string $pattern, string $value): bool
    {
        $value   = strtolower($value);
        $pattern = strtolower($pattern);
        switch ($operator) {
            case '=':
                return $value === $pattern;
            case '!=':
                return $value !== $pattern;
            case '^=':
                return preg_match('/^'.preg_quote($pattern, '/').'/', $value);

            case '$=':
                return preg_match('/'.preg_quote($pattern, '/').'$/', $value);

            case '*=':
                if ($pattern[0] == '/') {
                    return preg_match($pattern, $value);

                }

                return preg_match("/".$pattern."/i", $value);

        }

        return false;
    }

    /**
     * Attempts to figure out what the alteration will be for
     * the next element.
     *
     * @param array $rule
     * @return array
     */
    protected function alterNext(array $rule): array
    {
        $options = [];
        if ($rule['tag'] == '>') {
            $options['checkGrandChildren'] = false;
        }

        return $options;
    }

    /**
     * Flattens the option array.
     *
     * @param array $optionsArray
     * @return array
     */
    protected function flattenOptions(array $optionsArray)
    {
        $options = [];
        foreach ($optionsArray as $optionArray) {
            foreach ($optionArray as $key => $option) {
                $options[$key] = $option;
            }
        }

        return $options;
    }
}


1		<?php
2		namespace PHPHtmlParser;
3
4		use PHPHtmlParser\Dom\AbstractNode;
5		use PHPHtmlParser\Dom\Collection;
6		use PHPHtmlParser\Dom\InnerNode;
7		use PHPHtmlParser\Dom\LeafNode;
8		use PHPHtmlParser\Exceptions\ChildNotFoundException;
9		use Countable;
10
11		/**
12		* Class Selector
13		*
14		* @package PHPHtmlParser
15		*/
16		class Selector
17		{
18
19		/**
20		* Pattern of CSS selectors, modified from 'mootools'
21		*
22		* @var string
23		*/
24		protected $pattern = "/([\w\-:\>])(?:\#([\w\-]+)\|\.([\w\-]+))?(?:\[@?(!?[\w\-:]+)(?:([!^$]?=)[\"']?(.?)[\"']?)?\])?([\/, ]+)/is";
25
26		protected $selectors = [];
27
28		/**
29		* Constructs with the selector string
30		*
31		* @param string $selector
32		*/
33	249	public function __construct($selector)
34		{
35	249	$this->parseSelectorString($selector);
36	249	}
37
38		/**
39		* Returns the selectors that where found in __construct
40		*
41		* @return array
42		*/
43	12	public function getSelectors()
44		{
45	12	return $this->selectors;
46		}
47
48		/**
49		* Attempts to find the selectors starting from the given
50		* node object.
51		*
52		* @param AbstractNode $node
53		* @return Collection
54		*/
55	237	public function find(AbstractNode $node): Collection
56		{
57	237	$results = new Collection;
58	237	foreach ($this->selectors as $selector) {
59	237	$nodes = [$node];
60	237	if (count($selector) == 0) {
61		continue;
62		}
63
64	237	$options = [];
65	237	foreach ($selector as $rule) {
66	237	if ($rule['alterNext']) {
67	3	$options[] = $this->alterNext($rule);
68	3	continue;
69		}
70	237	$nodes = $this->seek($nodes, $rule, $options);
71		// clear the options
72	237	$options = [];
73		}
74
75		// this is the final set of nodes
76	237	foreach ($nodes as $result) {
77	222	$results[] = $result;
78		}
79		}
80
81	237	return $results;
82		}
83
84		/**
85		* Parses the selector string
86		*
87		* @param string $selector
88		*/
89	249	protected function parseSelectorString(string $selector): void
90		{
91	249	$matches = [];
92	249	preg_match_all($this->pattern, trim($selector).' ', $matches, PREG_SET_ORDER);
93
94		// skip tbody
95	249	$result = [];
96	249	foreach ($matches as $match) {
97		// default values
98	249	$tag = strtolower(trim($match[1]));
99	249	$operator = '=';
100	249	$key = null;
101	249	$value = null;
102	249	$noKey = false;
103	249	$alterNext = false;
104
105		// check for elements that alter the behavior of the next element
106	249	if ($tag == '>') {
107	3	$alterNext = true;
108		}
109
110		// check for id selector
111	249	if ( ! empty($match[2])) {
112	18	$key = 'id';
113	18	$value = $match[2];
114		}
115
116		// check for class selector
117	249	if ( ! empty($match[3])) {
118	48	$key = 'class';
119	48	$value = $match[3];
120		}
121
122		// and final attribute selector
123	249	if ( ! empty($match[4])) {
124	201	$key = strtolower($match[4]);
125		}
126	249	if ( ! empty($match[5])) {
127	192	$operator = $match[5];
128		}
129	249	if ( ! empty($match[6])) {
130	192	$value = $match[6];
131		}
132
133		// check for elements that do not have a specified attribute
134	249	if (isset($key[0]) && $key[0] == '!') {
135	3	$key = substr($key, 1);
136	3	$noKey = true;
137		}
138
139	249	$result[] = [
140	249	'tag' => $tag,
141	249	'key' => $key,
142	249	'value' => $value,
143	249	'operator' => $operator,
144	249	'noKey' => $noKey,
145	249	'alterNext' => $alterNext,
146		];
147	249	if (trim($match[7]) == ',') {
148	3	$this->selectors[] = $result;
149	167	$result = [];
150		}
151		}
152
153		// save last results
154	249	if (count($result) > 0) {
155	249	$this->selectors[] = $result;
156		}
157	249	}
158
159		/**
160		* Attempts to find all children that match the rule
161		* given.
162		*
163		* @param array $nodes
164		* @param array $rule
165		* @param array $options
166		* @return array
167		* @recursive
168		*/
169	237	protected function seek(array $nodes, array $rule, array $options): array
170		{
171		// XPath index
172	237	if (array_key_exists('tag', $rule) &&
173	237	array_key_exists('key', $rule) &&
174	237	is_numeric($rule['key'])
175		) {
176	3	$count = 0;
177		/** @var AbstractNode $node */
178	3	foreach ($nodes as $node) {
179	3	if ($rule['tag'] == '*' \|\|
180	3	$rule['tag'] == $node->getTag()->name()
181		) {
182	3	++$count;
183	3	if ($count == $rule['key']) {
184		// found the node we wanted
185	3	return [$node];
186		}
187		}
188		}
189
190		return [];
191		}
192
193	234	$options = $this->flattenOptions($options);
194
195	234	$return = [];
196		/** @var InnerNode $node */
197	234	foreach ($nodes as $node) {
198		// check if we are a leaf
199	234	if ($node instanceof LeafNode \|\|
200	234	! $node->hasChildren()
201		) {
202	12	continue;
203		}
204
205	234	$children = [];
206	234	$child = $node->firstChild();
207	234	while ( ! is_null($child)) {
208		// wild card, grab all
209	234	if ($rule['tag'] == '*' && is_null($rule['key'])) {
210	12	$return[] = $child;
211		try {
212	12	$child = $node->nextChild($child->id());
213	12	} catch (ChildNotFoundException $e) {
214		// no more children
215	12	$child = null;
216		}
217	12	continue;
218		}
219
220	234	$pass = true;
221		// check tag
222	234	if ( ! empty($rule['tag']) && $rule['tag'] != $child->getTag()->name() &&
223	234	$rule['tag'] != '*'
224		) {
225		// child failed tag check
226	210	$pass = false;
227		}
228
229		// check key
230	234	if ($pass && ! is_null($rule['key'])) {
231	84	if ($rule['noKey']) {
232		if ( ! is_null($child->getAttribute($rule['key']))) {
233		$pass = false;
234		}
235		} else {
236	84	if ($rule['key'] != 'plaintext' && !$child->hasAttribute($rule['key'])) {
237	81	$pass = false;
238		}
239		}
240		}
241
242		// compare values
243	234	if ($pass && ! is_null($rule['key']) &&
244	234	! is_null($rule['value']) && $rule['value'] != '*'
245		) {
246	81	if ($rule['key'] == 'plaintext') {
247		// plaintext search
248		$nodeValue = $child->text();
249		} else {
250		// normal search
251	81	$nodeValue = $child->getAttribute($rule['key']);
252		}
253
254	81	$check = $this->match($rule['operator'], $rule['value'], $nodeValue);
255
256		// handle multiple classes
257	81	if ( ! $check && $rule['key'] == 'class') {
258	36	$childClasses = explode(' ', $child->getAttribute('class'));
259	36	foreach ($childClasses as $class) {
260	36	if ( ! empty($class)) {
261	36	$check = $this->match($rule['operator'], $rule['value'], $class);
262		}
263	36	if ($check) {
264	31	break;
265		}
266		}
267		}
268
269	81	if ( ! $check) {
270	63	$pass = false;
271		}
272		}
273
274	234	if ($pass) {
275		// it passed all checks
276	189	$return[] = $child;
277		} else {
278		// this child failed to be matched
279	219	if ($child instanceof InnerNode &&
280	219	$child->hasChildren()
281		) {
282		// we still want to check its children
283	207	$children[] = $child;
284		}
285		}
286
287		try {
288		// get next child
289	234	$child = $node->nextChild($child->id());
290	234	} catch (ChildNotFoundException $e) {
291		// no more children
292	234	$child = null;
293		}
294		}
295
296	234	if (( ! isset($options['checkGrandChildren']) \|\|
297	234	$options['checkGrandChildren'])
298	234	&& count($children) > 0
299		) {
300		// we have children that failed but are not leaves.
301	204	$matches = $this->seek($children, $rule, $options);
302	204	foreach ($matches as $match) {
303	190	$return[] = $match;
304		}
305		}
306		}
307
308	234	return $return;
309		}
310
311		/**
312		* Attempts to match the given arguments with the given operator.
313		*
314		* @param string $operator
315		* @param string $pattern
316		* @param string $value
317		* @return bool
318		*/
319	81	protected function match(string $operator, string $pattern, string $value): bool
320		{
321	81	$value = strtolower($value);
322	81	$pattern = strtolower($pattern);
323	54	switch ($operator) {
324	81	case '=':
325	81	return $value === $pattern;
326		case '!=':
327		return $value !== $pattern;
328		case '^=':
329		return preg_match('/^'.preg_quote($pattern, '/').'/', $value);
		0 ignored issues – show Bug Best Practice introduced 2019-02-02 18:53 UTC by Report Bug Copy Issue Report The expression `return preg_match('/^' ....rn, '/') . '/', $value)` returns the type `integer` which is incompatible with the type-hinted return `boolean`. Loading history...
330		case '$=':
331		return preg_match('/'.preg_quote($pattern, '/').'$/', $value);
		0 ignored issues – show Bug Best Practice introduced 2019-02-02 18:53 UTC by Report Bug Copy Issue Report The expression `return preg_match('/' . ...n, '/') . '$/', $value)` returns the type `integer` which is incompatible with the type-hinted return `boolean`. Loading history...
332		case '*=':
333		if ($pattern[0] == '/') {
334		return preg_match($pattern, $value);
		0 ignored issues – show Bug Best Practice introduced 2019-02-02 18:53 UTC by Report Bug Copy Issue Report The expression `return preg_match($pattern, $value)` returns the type `integer` which is incompatible with the type-hinted return `boolean`. Loading history...
335		}
336
337		return preg_match("/".$pattern."/i", $value);
		0 ignored issues – show Bug Best Practice introduced 2019-02-02 18:53 UTC by Report Bug Copy Issue Report The expression `return preg_match('/' . $pattern . '/i', $value)` returns the type `integer` which is incompatible with the type-hinted return `boolean`. Loading history...
338		}
339
340		return false;
341		}
342
343		/**
344		* Attempts to figure out what the alteration will be for
345		* the next element.
346		*
347		* @param array $rule
348		* @return array
349		*/
350	3	protected function alterNext(array $rule): array
351		{
352	3	$options = [];
353	3	if ($rule['tag'] == '>') {
354	3	$options['checkGrandChildren'] = false;
355		}
356
357	3	return $options;
358		}
359
360		/**
361		* Flattens the option array.
362		*
363		* @param array $optionsArray
364		* @return array
365		*/
366	234	protected function flattenOptions(array $optionsArray)
367		{
368	234	$options = [];
369	234	foreach ($optionsArray as $optionArray) {
370	3	foreach ($optionArray as $key => $option) {
371	3	$options[$key] = $option;
372		}
373		}
374
375	234	return $options;
376		}
377		}
378

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