StringConditionTree::process() - Code Metrics - Inspection of "Added pattern {} support" - samsonframework/string-condition-tree - Measure and Improve Code Quality continuously with Scrutinizer

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by Vitaly

created 2017-04-03 11:57 UTC

StringConditionTree::process() A

↳ Parent: StringConditionTree

Complexity

Conditions	1
Paths	1

Size

Total Lines	10
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	10
rs	9.4285
c	0
b	0
f	0
cc	1
eloc	3
nc	1
nop	1

<?php declare(strict_types = 1);
/**
 * Created by Vitaly Iegorov <[email protected]>.
 * on 02.03.17 at 13:25
 */
namespace samsonframework\stringconditiontree;

/**
 * Class StringConditionTree
 *
 * @author Vitaly Egorov <[email protected]>
 */
class StringConditionTree
{
    const ROOT_NAME = '';
    const SELF_NAME = '@self';

    /** @var TreeNode Resulting collection for debugging */
    protected $debug;

    /** @var callable TreeNode value handler */
    protected $treeNodeValueHandler;

    /**
     * Set TreeNode value handler.
     *
     * @param callable $handler TreeNode value handler
     */
    public function setTreeNodeValueHandler(callable $handler)
    {
        $this->treeNodeValueHandler = $handler;
    }

    /**
     * Build similarity strings tree.
     *
     * @param array $input Collection of strings
     *
     * @return TreeNode Resulting similarity strings tree
     */
    public function process(array $input): TreeNode
    {
        /**
         * We need to find first matching character that present at least at one two string
         * to start building tree. Otherwise there is no reason to build tree.
         */
        $this->innerProcessor(self::ROOT_NAME, $input, $this->debug = new TreeNode());

        return $this->debug;
    }

    /**
     * Sort array by key string lengths.
     *
     * @param array $input Input array for sorting
     * @param int   $order Sorting order
     */
    protected function sortArrayByKeys(array &$input, int $order = SORT_ASC)
    {
        array_multisort(array_map('strlen', array_keys($input)), $order, $input);

    }

    /**
     * Add only unique value to array.
     *
     * @param mixed $value  Unique value
     * @param array $array  Array for adding unique value
     * @param bool  $strict Strict uniqueness check
     *
     * @see in_array();
     *
     * @return bool True if unique value was added
     */
    protected function addUniqueToArray($value, &$array, bool $strict = true)
    {
        // Create array if not array is passed
        if (!is_array($array)) {
            $array = [];
        }

        // Add value to array if it is unique
        if (!in_array($value, $array, $strict)) {
            $array[] = $value;

            return true;
        } else { // Value is already in array
            return false;
        }
    }

    /**
     * Find longest matching prefix between two strings.
     *
     * @param string $initialString  Initial string
     * @param string $comparedString Compared string
     *
     * @return string Longest matching prefix
     */
    protected function getLongestMatchingPrefix(string $initialString, string $comparedString): string
    {
        // Iterate and compare how string matches
        $longestPrefix = '';

        // Define shortest & longest strings to avoid errors
        $initialLength = strlen($initialString);
        $comparedLength = strlen($comparedString);

        // Define shortest and longest strings to avoid character matching errors
        $shortestString = $initialLength < $comparedLength ? $initialString : $comparedString;
        $longestString = $initialLength >= $comparedLength ? $initialString : $comparedString;

        // Iterate initial string characters
        $isPattern = false;
        for ($z = 0, $length = strlen($shortestString); $z < $length; $z++) {
            // Pattern support
            // TODO: Probably can be optimized
            if ($isPattern || $shortestString{$z} === '{') {
                $isPattern = true;

                // Concatenate longest matching prefix
                $longestPrefix .= $shortestString{$z};

                // Compare characters with compared string
                if ($shortestString{$z} !== $longestString{$z}) {
                    // Clear pattern as pattern characters mismatch
                    $longestPrefix = '';
                    break;
                }

                // If pattern id closed unset flag fro special behaviour
                if ($shortestString{$z} === '}') {
                    $isPattern = false;
                }
            } else {
                // Compare characters with compared string
                if ($shortestString{$z} !== $longestString{$z}) {
                    break; // Exit on first mismatching character
                }

                // Concatenate matching part of two strings
                $longestPrefix .= $initialString{$z};
            }
        }

        return $longestPrefix;
    }

    /**
     * Remove key string from the beginning of all sub-array strings.
     *
     * @param array  $array Input array of key => [keyStrings...]
     *
     * @param string $selfMarker Marker for storing self pointer
     *
     * @return array Processed array with removed keys from beginning of sub arrays
     */
    protected function removeKeyFromArrayStrings(array $array, string $selfMarker): array
    {
        $result = [];
        /** @var string[] $values */
        foreach ($array as $key => $values) {
            $lmpLength = strlen((string)$key);
            foreach ($values as $string) {
                $newString = substr($string, $lmpLength);

                if ($newString === '' || $string === $selfMarker) {
                    $result[$key][] = $selfMarker;
                } else {
                    $result[$key][] = $newString;
                }
            }
        }

        return $result;
    }

    /**
     * Find all duplication of source array values in compared array and remove them.
     *
     * @param array $source Source array
     * @param array $compared Compared array for filtering duplicates
     */
    protected function removeDuplicatesInSubArray(array $source, array &$compared)
    {
        foreach ($source as $value) {
            foreach ($compared as $key => &$subValue) {
                if ($subValue === $value) {
                    unset($compared[$key]);
                }
            }
        }
    }

    /**
     * Recursive string similarity tree builder.
     *
     * @param string   $prefix
     * @param array    $input
     * @param TreeNode $result
     * @param string   $selfMarker
     */
    protected function innerProcessor(string $prefix, array $input, TreeNode $result, $selfMarker = self::SELF_NAME)
    {
        // Rewrite prefix if TreeNode value handler is present
        $prefix = is_callable($this->treeNodeValueHandler) ? call_user_func($this->treeNodeValueHandler, $prefix) : $prefix;

        // Create tree node
        $newChild = $result->append($prefix);

        /**
         * Iterate all combinations of strings and group by LMP
         */
        $longestPrefixes = [];
        for ($i = 0, $count = count($input); $i < $count; $i++) {
            for ($j = $i + 1; $j < $count; $j++) {
                $longestMatchedPrefix = $this->getLongestMatchingPrefix($input[$i], $input[$j]);

                // We have found at least one matching character between strings
                if ($longestMatchedPrefix !== '') {
                    $this->addUniqueToArray($input[$i], $longestPrefixes[$longestMatchedPrefix]);
                    $this->addUniqueToArray($input[$j], $longestPrefixes[$longestMatchedPrefix]);
                }
            }
        }

        /**
         * Sort LMPs(array keys) ascending by key length
         */
        $this->sortArrayByKeys($longestPrefixes);

        /**
         * Iterate all sorted LMP strings and remove duplicates from LMP string ordered lower
         */
        $keys = array_keys($longestPrefixes);
        for ($i = 0, $length = count($keys); $i < $length; $i++) {
            for ($j = $i + 1; $j < $length; $j++) {
                $this->removeDuplicatesInSubArray($longestPrefixes[$keys[$i]], $longestPrefixes[$keys[$j]]);
            }
        }

        // Remove empty LMPs as they are included in smaller LMPs
        $longestPrefixes = array_filter($longestPrefixes);

        /**
         * Search for input string that do not have LMP, and add missing as LMP
         */
        foreach ($input as $string) {
            $found = false;

            if ($string !== $selfMarker) {
                foreach ($longestPrefixes as $strings) {
                    if (in_array($string, $strings, true)) {
                        $found = true;
                        break;
                    }
                }

                if (!$found) {
                    $longestPrefixes[$string] = [$selfMarker];
                }
            }
        }

        /**
         * After filtering LMPs remove LMP from matched string arrays
         */
        $longestPrefixes = $this->removeKeyFromArrayStrings($longestPrefixes, $selfMarker);

        /**
         * If we have self marker as an input string - create LMP for it
         */
        if (in_array($selfMarker, $input, true)) {
            $longestPrefixes = array_merge([$selfMarker => []], $longestPrefixes);
        }

        /**
         * Recursively iterate current level LMPs
         */
        foreach ($longestPrefixes as $longestPrefix => $strings) {
            $this->innerProcessor((string)$longestPrefix, $strings, $newChild);
        }
    }
}


1			<?php declare(strict_types = 1);
2			/**
3			* Created by Vitaly Iegorov <[email protected]>.
4			* on 02.03.17 at 13:25
5			*/
6			namespace samsonframework\stringconditiontree;
7
8			/**
9			* Class StringConditionTree
10			*
11			* @author Vitaly Egorov <[email protected]>
12			*/
13			class StringConditionTree
14			{
15			const ROOT_NAME = '';
16			const SELF_NAME = '@self';
17
18			/** @var TreeNode Resulting collection for debugging */
19			protected $debug;
20
21			/** @var callable TreeNode value handler */
22			protected $treeNodeValueHandler;
23
24			/**
25			* Set TreeNode value handler.
26			*
27			* @param callable $handler TreeNode value handler
28			*/
29			public function setTreeNodeValueHandler(callable $handler)
30			{
31			$this->treeNodeValueHandler = $handler;
32			}
33
34			/**
35			* Build similarity strings tree.
36			*
37			* @param array $input Collection of strings
38			*
39			* @return TreeNode Resulting similarity strings tree
40			*/
41			public function process(array $input): TreeNode
42			{
43			/**
44			* We need to find first matching character that present at least at one two string
45			* to start building tree. Otherwise there is no reason to build tree.
46			*/
47			$this->innerProcessor(self::ROOT_NAME, $input, $this->debug = new TreeNode());
48
49			return $this->debug;
50			}
51
52			/**
53			* Sort array by key string lengths.
54			*
55			* @param array $input Input array for sorting
56			* @param int $order Sorting order
57			*/
58			protected function sortArrayByKeys(array &$input, int $order = SORT_ASC)
59			{
60			array_multisort(array_map('strlen', array_keys($input)), $order, $input);
			0 ignored issues – show Bug introduced 2017-03-31 09:16 UTC by Report Bug Copy Issue Report `array_map('strlen', array_keys($input))` cannot be passed to `array_multisort()` as the parameter `$arr` expects a reference. Loading history...
61			}
62
63			/**
64			* Add only unique value to array.
65			*
66			* @param mixed $value Unique value
67			* @param array $array Array for adding unique value
68			* @param bool $strict Strict uniqueness check
69			*
70			* @see in_array();
71			*
72			* @return bool True if unique value was added
73			*/
74			protected function addUniqueToArray($value, &$array, bool $strict = true)
75			{
76			// Create array if not array is passed
77			if (!is_array($array)) {
78			$array = [];
79			}
80
81			// Add value to array if it is unique
82			if (!in_array($value, $array, $strict)) {
83			$array[] = $value;
84
85			return true;
86			} else { // Value is already in array
87			return false;
88			}
89			}
90
91			/**
92			* Find longest matching prefix between two strings.
93			*
94			* @param string $initialString Initial string
95			* @param string $comparedString Compared string
96			*
97			* @return string Longest matching prefix
98			*/
99			protected function getLongestMatchingPrefix(string $initialString, string $comparedString): string
100			{
101			// Iterate and compare how string matches
102			$longestPrefix = '';
103
104			// Define shortest & longest strings to avoid errors
105			$initialLength = strlen($initialString);
106			$comparedLength = strlen($comparedString);
107
108			// Define shortest and longest strings to avoid character matching errors
109			$shortestString = $initialLength < $comparedLength ? $initialString : $comparedString;
110			$longestString = $initialLength >= $comparedLength ? $initialString : $comparedString;
111
112			// Iterate initial string characters
113			$isPattern = false;
114			for ($z = 0, $length = strlen($shortestString); $z < $length; $z++) {
115			// Pattern support
116			// TODO: Probably can be optimized
117			if ($isPattern \|\| $shortestString{$z} === '{') {
118			$isPattern = true;
119
120			// Concatenate longest matching prefix
121			$longestPrefix .= $shortestString{$z};
122
123			// Compare characters with compared string
124			if ($shortestString{$z} !== $longestString{$z}) {
125			// Clear pattern as pattern characters mismatch
126			$longestPrefix = '';
127			break;
128			}
129
130			// If pattern id closed unset flag fro special behaviour
131			if ($shortestString{$z} === '}') {
132			$isPattern = false;
133			}
134			} else {
135			// Compare characters with compared string
136			if ($shortestString{$z} !== $longestString{$z}) {
137			break; // Exit on first mismatching character
138			}
139
140			// Concatenate matching part of two strings
141			$longestPrefix .= $initialString{$z};
142			}
143			}
144
145			return $longestPrefix;
146			}
147
148			/**
149			* Remove key string from the beginning of all sub-array strings.
150			*
151			* @param array $array Input array of key => [keyStrings...]
152			*
153			* @param string $selfMarker Marker for storing self pointer
154			*
155			* @return array Processed array with removed keys from beginning of sub arrays
156			*/
157			protected function removeKeyFromArrayStrings(array $array, string $selfMarker): array
158			{
159			$result = [];
160			/** @var string[] $values */
161			foreach ($array as $key => $values) {
162			$lmpLength = strlen((string)$key);
163			foreach ($values as $string) {
164			$newString = substr($string, $lmpLength);
165
166			if ($newString === '' \|\| $string === $selfMarker) {
167			$result[$key][] = $selfMarker;
168			} else {
169			$result[$key][] = $newString;
170			}
171			}
172			}
173
174			return $result;
175			}
176
177			/**
178			* Find all duplication of source array values in compared array and remove them.
179			*
180			* @param array $source Source array
181			* @param array $compared Compared array for filtering duplicates
182			*/
183			protected function removeDuplicatesInSubArray(array $source, array &$compared)
184			{
185			foreach ($source as $value) {
186			foreach ($compared as $key => &$subValue) {
187			if ($subValue === $value) {
188			unset($compared[$key]);
189			}
190			}
191			}
192			}
193
194			/**
195			* Recursive string similarity tree builder.
196			*
197			* @param string $prefix
198			* @param array $input
199			* @param TreeNode $result
200			* @param string $selfMarker
201			*/
202			protected function innerProcessor(string $prefix, array $input, TreeNode $result, $selfMarker = self::SELF_NAME)
203			{
204			// Rewrite prefix if TreeNode value handler is present
205			$prefix = is_callable($this->treeNodeValueHandler) ? call_user_func($this->treeNodeValueHandler, $prefix) : $prefix;
206
207			// Create tree node
208			$newChild = $result->append($prefix);
209
210			/**
211			* Iterate all combinations of strings and group by LMP
212			*/
213			$longestPrefixes = [];
214			for ($i = 0, $count = count($input); $i < $count; $i++) {
215			for ($j = $i + 1; $j < $count; $j++) {
216			$longestMatchedPrefix = $this->getLongestMatchingPrefix($input[$i], $input[$j]);
217
218			// We have found at least one matching character between strings
219			if ($longestMatchedPrefix !== '') {
220			$this->addUniqueToArray($input[$i], $longestPrefixes[$longestMatchedPrefix]);
221			$this->addUniqueToArray($input[$j], $longestPrefixes[$longestMatchedPrefix]);
222			}
223			}
224			}
225
226			/**
227			* Sort LMPs(array keys) ascending by key length
228			*/
229			$this->sortArrayByKeys($longestPrefixes);
230
231			/**
232			* Iterate all sorted LMP strings and remove duplicates from LMP string ordered lower
233			*/
234			$keys = array_keys($longestPrefixes);
235			for ($i = 0, $length = count($keys); $i < $length; $i++) {
236			for ($j = $i + 1; $j < $length; $j++) {
237			$this->removeDuplicatesInSubArray($longestPrefixes[$keys[$i]], $longestPrefixes[$keys[$j]]);
238			}
239			}
240
241			// Remove empty LMPs as they are included in smaller LMPs
242			$longestPrefixes = array_filter($longestPrefixes);
243
244			/**
245			* Search for input string that do not have LMP, and add missing as LMP
246			*/
247			foreach ($input as $string) {
248			$found = false;
249
250			if ($string !== $selfMarker) {
251			foreach ($longestPrefixes as $strings) {
252			if (in_array($string, $strings, true)) {
253			$found = true;
254			break;
255			}
256			}
257
258			if (!$found) {
259			$longestPrefixes[$string] = [$selfMarker];
260			}
261			}
262			}
263
264			/**
265			* After filtering LMPs remove LMP from matched string arrays
266			*/
267			$longestPrefixes = $this->removeKeyFromArrayStrings($longestPrefixes, $selfMarker);
268
269			/**
270			* If we have self marker as an input string - create LMP for it
271			*/
272			if (in_array($selfMarker, $input, true)) {
273			$longestPrefixes = array_merge([$selfMarker => []], $longestPrefixes);
274			}
275
276			/**
277			* Recursively iterate current level LMPs
278			*/
279			foreach ($longestPrefixes as $longestPrefix => $strings) {
280			$this->innerProcessor((string)$longestPrefix, $strings, $newChild);
281			}
282			}
283			}
284

samsonframework / string-condition-tree

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StringConditionTree::process() A

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