TrieTree::delete() - Code Metrics - SiroDiaz/DataStructures - Measure and Improve Code Quality continuously with Scrutinizer

TrieTree::delete() C
last analyzed 2017-08-06 10:37 UTC

↳ Parent: TrieTree

Complexity

Conditions	11
Paths	10

Size

Total Lines	43
Code Lines	31

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
c	0
b	0
f	0
dl	0
loc	43
rs	5.2653
cc	11
eloc	31
nc	10
nop	1

How to fix Complexity

<?php
/**
 * DataStructures for PHP
 *
 * @link      https://github.com/SiroDiaz/DataStructures
 * @copyright Copyright (c) 2017 Siro Díaz Palazón
 * @license   https://github.com/SiroDiaz/DataStructures/blob/master/README.md (MIT License)
 */
namespace DataStructures\Trees;

use DataStructures\Trees\Nodes\TrieNode;
use Countable;

/**
 * TrieTree
 *
 * The TrieTree class is a trie (also called digital tree and sometimes radix tree or prefix tree)
 * that is used to get in O(m) being m the word length.
 * It is used in software like word corrector and word suggest.
 *
 * @author Siro Diaz Palazon <[email protected]>
 */
class TrieTree implements Countable {
    private $root;
    private $numWords;
    private $size;
    
    public function __construct() {
        $this->root = new TrieNode();
        $this->numWords = 0;
        $this->size = 0;
    }

    /**
     * Returns true if the tree is empty. Number of prefixes is 0.
     *
     * @return bool true if empty.
     */
    public function empty() : bool {
        return $this->size === 0;
    }

    /**
     * Returns the number of prefixes that are contained in the trie.
     *
     * @return int the num of prefixes.
     */
    public function size() : int {
        return $this->size;
    }

    /**
     * Inserts a new word in the tree. If the word exists it doesn't do nothing.
     *
     * @param string $word the word to be added.
     */
    public function add($word) {
        $word = trim($word);
        $wordLength = mb_strlen($word);
        if($wordLength === 0) {
            return;
        }

        $current = &$this->root;
        for($i = 0; $i < $wordLength; $i++) {
            $char = mb_substr($word, $i, 1, 'UTF-8');
            if(!isset($current->children[$char])) {
                if($i === $wordLength - 1) {
                    $current->children[$char] = new TrieNode($char, $current, true);
                    $this->numWords++;
                } else {
                    $current->children[$char] = new TrieNode($char, $current, false);
                }
                $this->size++;
            } else {
                if($i === $wordLength - 1) {
                    if($current->children[$char]->isWord === false) {
                        $current->children[$char]->isWord = true;
                        $this->numWords++;
                    }
                }
            }

            $current = &$current->children[$char];
        }
    }

    /**
     * Returns true if the word is stored in the tree.
     *
     * @param string $word The word to check if exists.
     * @param bool true if is contained.
     */
    public function contains($word) : bool {
        $word = trim($word);
        $wordLength = mb_strlen($word);
        if($wordLength === 0) {
            return true;
        }

        $i = 0;
        $found = true;
        $current = $this->root;
        while($found && $i < $wordLength) {
            $char = mb_substr($word, $i, 1);
            if(isset($current->children[$char])) {
                $current = $current->children[$char];
            } else {
                $found = false;
            }
            $i++;
        }

        if($found && $current->isWord) {
            return true;
        }

        return false;
    }

    /**
     * Removes a word from the tree.
     *
     * @param string $word the word to delete if it is contained in the trie.
     */
    public function delete($word) {
        $wordLength = mb_strlen($word);
        $i = 0;
        $current = $this->root;
        
        while($i < $wordLength) {
            if($current->hasChildren()) {
                $char = mb_substr($word, $i, 1, 'UTF-8');
                if(isset($current->children[$char])) {
                    $node = &$current->children[$char];
                    if(($i === $wordLength - 1) && $node->isWord) {
                        if($node->hasChildren()) {
                            $node->isWord = false;
                        } else {
                            $parentNode = &$node->parent;
                            unset($parentNode->children[$char]);
                            $this->size--;
                            $j = $i - 1;

                            while($j >= 0 && $parentNode->isLeaf() && !$parentNode->isWord) {
                                $char = mb_substr($word, $j, 1, 'UTF-8');
                                $parentNode = &$parentNode->parent;
                                unset($parentNode->children[$char]);
                                $this->size--;
                                $j--;
                            }
                        }

                        $this->numWords--;
                    }
                }
            } else {
                return;
            }

            if(isset($current->children[$char])) {
                $current = $current->children[$char];
            } else {
                $current = $current->parent;    //TODO need to delete all leaf nodes
            }
            $i++;
        }
    }

    /**
     * Removes all nodes (and words) in the tree and resets the size
     * and word count.
     */
    public function clear() {
        foreach($this->root->children as $key => &$node) {
            $this->_clear($node);
            unset($this->root->children[$key]);
        }

        $this->size = 0;
        $this->numWords = 0;
    }

    /**
     * Recursive clear that removes all nodes, included leaf, except
     * the references to the first children.
     *
     * @param DataStructures\Trees\Nodes\TrieNode|null the node to traverse.
     * @return DataStructures\Trees\Nodes\TrieNode|null the next node to delete.
     */
    private function _clear(TrieNode &$node = null) {
        foreach($node->children as $char => &$n) {
            $aux = $node->children[$char];
            unset($node->children[$char]);
            $node = null;
            return $this->_clear($aux);
        }
    }

    /**
     * Returns an array containing all words stored in the tree.
     * It starts to search from the root that contains an empty string
     * using the withPrefix method.
     *
     * @return array an empty array if there are not words in the tree.
     */
    public function getWords() : array {
        if($this->size === 0) {
            return [];
        }

        return $this->withPrefix('');
    }

    /**
     * Checks if there is any word that starts with a concrete prefix.
     *
     * @param string $prefix The prefix to look up.
     * @return true if there are words that start with the especified prefix.
     */
    public function startsWith($prefix) : bool {
        return $this->getNodeFromPrefix($prefix) !== null;
    }

    /**
     * Returns an array with all words that has the especified prefix.
     * For example, with prefix 'he' it will retrieve: hell, hello, ....
     *
     * @param string $prefix The prefix that must have all words.
     * @return array All words that contains the prefix.
     */
    public function withPrefix($prefix) : array {
        $node = $this->getNodeFromPrefix($prefix);
        $words = [];
        if($node !== null) {
            if($node->isWord) {
                $words[] = $prefix;
            }
            foreach($node->children as $char => $n) {

                $words = $this->_traverseWithPrefix($node->children[$char], $words, $prefix . $char);
            }
        }

        return $words;
    }

    /**
     *
     */
    private function _traverseWithPrefix(TrieNode $node = null, $words = [], $word) {
        if($node->isWord) {
            $words[] = $word;
        }

        if(empty($node->children)) {
            return $words;
        }

        foreach($node->children as $char => &$n) {

            $words = $this->_traverseWithPrefix($node->children[$char], $words, $word . $char);
        }

        return $words;
    }

    /**
     * Retrieves the node where ends the prefix especified.
     *
     * @param string $prefix The prefix to look for.
     * @return DataStructures\Trees\Nodes\TrieNode|null null if not found.
     */
    private function getNodeFromPrefix($prefix) {
        if($this->size === 0) {
            return null;
        }
        
        $i = 0;
        $current = $this->root;
        $prefixLength = mb_strlen(trim($prefix));
        while($i < $prefixLength) {
            $char = mb_substr($prefix, $i, 1, 'UTF-8');
            if(!isset($current->children[$char])) {
                return null;
            }
            $current = $current->children[$char];
            $i++;
        }

        return $current;
    }

    /**
     * Gets the number of words stored in the tree.
     *
     * @return int The word count.
     */
    public function wordCount() : int {
        return $this->numWords;
    }

    /**
     * Gets the number of prefixes stored in the tree.
     *
     * @return int The word count.
     */
    public function count() : int {
        return $this->size();
    }
}

1		<?php
2		/**
3		* DataStructures for PHP
4		*
5		* @link https://github.com/SiroDiaz/DataStructures
6		* @copyright Copyright (c) 2017 Siro Díaz Palazón
7		* @license https://github.com/SiroDiaz/DataStructures/blob/master/README.md (MIT License)
8		*/
9		namespace DataStructures\Trees;
10
11		use DataStructures\Trees\Nodes\TrieNode;
12		use Countable;
13
14		/**
15		* TrieTree
16		*
17		* The TrieTree class is a trie (also called digital tree and sometimes radix tree or prefix tree)
18		* that is used to get in O(m) being m the word length.
19		* It is used in software like word corrector and word suggest.
20		*
21		* @author Siro Diaz Palazon <[email protected]>
22		*/
23		class TrieTree implements Countable {
24		private $root;
25		private $numWords;
26		private $size;
27
28		public function __construct() {
29		$this->root = new TrieNode();
30		$this->numWords = 0;
31		$this->size = 0;
32		}
33
34		/**
35		* Returns true if the tree is empty. Number of prefixes is 0.
36		*
37		* @return bool true if empty.
38		*/
39		public function empty() : bool {
40		return $this->size === 0;
41		}
42
43		/**
44		* Returns the number of prefixes that are contained in the trie.
45		*
46		* @return int the num of prefixes.
47		*/
48		public function size() : int {
49		return $this->size;
50		}
51
52		/**
53		* Inserts a new word in the tree. If the word exists it doesn't do nothing.
54		*
55		* @param string $word the word to be added.
56		*/
57		public function add($word) {
58		$word = trim($word);
59		$wordLength = mb_strlen($word);
60		if($wordLength === 0) {
61		return;
62		}
63
64		$current = &$this->root;
65		for($i = 0; $i < $wordLength; $i++) {
66		$char = mb_substr($word, $i, 1, 'UTF-8');
67		if(!isset($current->children[$char])) {
68		if($i === $wordLength - 1) {
69		$current->children[$char] = new TrieNode($char, $current, true);
70		$this->numWords++;
71		} else {
72		$current->children[$char] = new TrieNode($char, $current, false);
73		}
74		$this->size++;
75		} else {
76		if($i === $wordLength - 1) {
77		if($current->children[$char]->isWord === false) {
78		$current->children[$char]->isWord = true;
79		$this->numWords++;
80		}
81		}
82		}
83
84		$current = &$current->children[$char];
85		}
86		}
87
88		/**
89		* Returns true if the word is stored in the tree.
90		*
91		* @param string $word The word to check if exists.
92		* @param bool true if is contained.
93		*/
94		public function contains($word) : bool {
95		$word = trim($word);
96		$wordLength = mb_strlen($word);
97		if($wordLength === 0) {
98		return true;
99		}
100
101		$i = 0;
102		$found = true;
103		$current = $this->root;
104		while($found && $i < $wordLength) {
105		$char = mb_substr($word, $i, 1);
106		if(isset($current->children[$char])) {
107		$current = $current->children[$char];
108		} else {
109		$found = false;
110		}
111		$i++;
112		}
113
114		if($found && $current->isWord) {
115		return true;
116		}
117
118		return false;
119		}
120
121		/**
122		* Removes a word from the tree.
123		*
124		* @param string $word the word to delete if it is contained in the trie.
125		*/
126		public function delete($word) {
127		$wordLength = mb_strlen($word);
128		$i = 0;
129		$current = $this->root;
130
131		while($i < $wordLength) {
132		if($current->hasChildren()) {
133		$char = mb_substr($word, $i, 1, 'UTF-8');
134		if(isset($current->children[$char])) {
135		$node = &$current->children[$char];
136		if(($i === $wordLength - 1) && $node->isWord) {
137		if($node->hasChildren()) {
138		$node->isWord = false;
139		} else {
140		$parentNode = &$node->parent;
141		unset($parentNode->children[$char]);
142		$this->size--;
143		$j = $i - 1;
144
145		while($j >= 0 && $parentNode->isLeaf() && !$parentNode->isWord) {
146		$char = mb_substr($word, $j, 1, 'UTF-8');
147		$parentNode = &$parentNode->parent;
148		unset($parentNode->children[$char]);
149		$this->size--;
150		$j--;
151		}
152		}
153
154		$this->numWords--;
155		}
156		}
157		} else {
158		return;
159		}
160
161		if(isset($current->children[$char])) {
162		$current = $current->children[$char];
163		} else {
164		$current = $current->parent; //TODO need to delete all leaf nodes
165		}
166		$i++;
167		}
168		}
169
170		/**
171		* Removes all nodes (and words) in the tree and resets the size
172		* and word count.
173		*/
174		public function clear() {
175		foreach($this->root->children as $key => &$node) {
176		$this->_clear($node);
177		unset($this->root->children[$key]);
178		}
179
180		$this->size = 0;
181		$this->numWords = 0;
182		}
183
184		/**
185		* Recursive clear that removes all nodes, included leaf, except
186		* the references to the first children.
187		*
188		* @param DataStructures\Trees\Nodes\TrieNode\|null the node to traverse.
189		* @return DataStructures\Trees\Nodes\TrieNode\|null the next node to delete.
190		*/
191		private function _clear(TrieNode &$node = null) {
192		foreach($node->children as $char => &$n) {
193		$aux = $node->children[$char];
194		unset($node->children[$char]);
195		$node = null;
196		return $this->_clear($aux);
197		}
198		}
199
200		/**
201		* Returns an array containing all words stored in the tree.
202		* It starts to search from the root that contains an empty string
203		* using the withPrefix method.
204		*
205		* @return array an empty array if there are not words in the tree.
206		*/
207		public function getWords() : array {
208		if($this->size === 0) {
209		return [];
210		}
211
212		return $this->withPrefix('');
213		}
214
215		/**
216		* Checks if there is any word that starts with a concrete prefix.
217		*
218		* @param string $prefix The prefix to look up.
219		* @return true if there are words that start with the especified prefix.
220		*/
221		public function startsWith($prefix) : bool {
222		return $this->getNodeFromPrefix($prefix) !== null;
223		}
224
225		/**
226		* Returns an array with all words that has the especified prefix.
227		* For example, with prefix 'he' it will retrieve: hell, hello, ....
228		*
229		* @param string $prefix The prefix that must have all words.
230		* @return array All words that contains the prefix.
231		*/
232		public function withPrefix($prefix) : array {
233		$node = $this->getNodeFromPrefix($prefix);
234		$words = [];
235		if($node !== null) {
236		if($node->isWord) {
237		$words[] = $prefix;
238		}
239	View Code Duplication	foreach($node->children as $char => $n) {
		0 ignored issues – show Duplication introduced 2017-06-14 20:46 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
240		$words = $this->_traverseWithPrefix($node->children[$char], $words, $prefix . $char);
241		}
242		}
243
244		return $words;
245		}
246
247		/**
248		*
249		*/
250		private function _traverseWithPrefix(TrieNode $node = null, $words = [], $word) {
251		if($node->isWord) {
252		$words[] = $word;
253		}
254
255		if(empty($node->children)) {
256		return $words;
257		}
258
259	View Code Duplication	foreach($node->children as $char => &$n) {
		0 ignored issues – show Duplication introduced 2017-06-14 20:46 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
260		$words = $this->_traverseWithPrefix($node->children[$char], $words, $word . $char);
261		}
262
263		return $words;
264		}
265
266		/**
267		* Retrieves the node where ends the prefix especified.
268		*
269		* @param string $prefix The prefix to look for.
270		* @return DataStructures\Trees\Nodes\TrieNode\|null null if not found.
271		*/
272		private function getNodeFromPrefix($prefix) {
273		if($this->size === 0) {
274		return null;
275		}
276
277		$i = 0;
278		$current = $this->root;
279		$prefixLength = mb_strlen(trim($prefix));
280		while($i < $prefixLength) {
281		$char = mb_substr($prefix, $i, 1, 'UTF-8');
282		if(!isset($current->children[$char])) {
283		return null;
284		}
285		$current = $current->children[$char];
286		$i++;
287		}
288
289		return $current;
290		}
291
292		/**
293		* Gets the number of words stored in the tree.
294		*
295		* @return int The word count.
296		*/
297		public function wordCount() : int {
298		return $this->numWords;
299		}
300
301		/**
302		* Gets the number of prefixes stored in the tree.
303		*
304		* @return int The word count.
305		*/
306		public function count() : int {
307		return $this->size();
308		}
309		}

SiroDiaz / DataStructures

TrieTree::delete() C last analyzed 2017-08-06 10:37 UTC

Complexity

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Duplication

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TrieTree::delete() C
last analyzed 2017-08-06 10:37 UTC