PhpFileParser::computeNestingParentTokens() - Code Metrics - Srokap/code_review - Measure and Improve Code Quality continuously with Scrutinizer

PhpFileParser::computeNestingParentTokens() C
last analyzed 2016-05-15 21:09 UTC

↳ Parent: PhpFileParser

Complexity

Conditions	11
Paths	14

Size

Total Lines	38
Code Lines	27

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	28
CRAP Score	11.6653

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	11
eloc	27
c	1
b	0
f	0
nc	14
nop	1
dl	0
loc	38
ccs	28
cts	34
cp	0.8235
crap	11.6653
rs	5.2653

How to fix Complexity

<?php
namespace CodeReview;

/**
 * Splits file source to tokens, provides ways to manipulate tokens list and output modified source.
 * Intended to help in code replacements on language syntax level.
 */
class PhpFileParser implements \Iterator, \ArrayAccess {

	/**
	 * @var string original file name
	 */
	private $fileName = null;

	/**
	 * @var array
	 */
	private $tokens = null;

	/**
	 * @var string
	 */
	private $sha1hash = null;

	/**
	 * @param $fileName
	 * @throws \CodeReview\IOException
	 * @throws Exception
	 */
	public function __construct($fileName) {
		$this->validateFilePath($fileName);
		$this->fileName = $fileName;

		$contents = file_get_contents($fileName);
		if ($contents === false) {
			throw new IOException("Error while fetching contents of file $fileName");
		}

		$this->sha1hash = sha1_file($fileName);
		if ($this->sha1hash === false) {
			throw new IOException("Error while computing SHA1 hash of file $fileName");
		}

		$this->tokens = token_get_all($contents);
		if (!is_array($this->tokens)) {
			throw new \Exception("Failed to parse PHP contents of $fileName");
		}
		$this->computeNestingParentTokens();
	}

	/**
	 * Return fileds to serialize.
	 *
	 * @return array
	 */
	public function __sleep() {
		return array('fileName', 'sha1hash', 'tokens');
	}

	/**
	 * Verify class contents against original file to detect changes.
	 */
	public function __wakeup() {
		$this->validateFileContents();
	}

	/**
	 * Uses SHA1 hash to determine if file contents has changed since analysis.
	 *
	 * @return bool
	 * @throws \CodeReview\IOException
	 * @throws LogicException
	 */
	protected function validateFileContents() {
		if (!$this->fileName) {
			throw new \LogicException("Missing file's path. Looks like severe internal error.");
		}
		$this->validateFilePath($this->fileName);
		if (!$this->sha1hash) {
			throw new \LogicException("Missing file's SHA1 hash. Looks like severe internal error.");
		}
		if ($this->sha1hash !== sha1_file($this->fileName)) {
			throw new IOException("The file on disk has changed and this " . get_class($this) . " class instance is no longer valid for use. Please create fresh instance.");
		}
		return true;
	}

	/**
	 * Checks if file exists and is readable.
	 *
	 * @param $fileName
	 * @return bool
	 * @throws \CodeReview\IOException
	 */
	protected function validateFilePath($fileName) {
		if (!file_exists($fileName)) {
			throw new IOException("File $fileName does not exists");
		}
		if (!is_file($fileName)) {
			throw new IOException("$fileName must be a file");
		}
		if (!is_readable($fileName)) {
			throw new IOException("File $fileName is not readable");
		}
		return true;
	}

	/**
	 * Compute parents of the tokens to easily determine containing methods and classes.
	 *
	 * @param bool $debug
	 */
	private function computeNestingParentTokens($debug = false) {
		$nesting = 0;
		$parents = array();
		$lastParent = null;
		foreach ($this->tokens as $key => $token) {
			if (is_array($token)) {
				//add info about parent to array
				$parent = $parents ? $parents[count($parents)-1] : null;
				$this->tokens[$key][3] = $parent;
				$this->tokens[$key][4] = $nesting;

				//is current token possible parent in current level?
				if ($this->isEqualToAnyToken(array(T_CLASS, T_INTERFACE, T_FUNCTION), $key)) {
					$lastParent = $key + 2;
				} elseif ($this->isEqualToAnyToken(array(T_CURLY_OPEN, T_DOLLAR_OPEN_CURLY_BRACES), $key)) {
					$nesting++;
					array_push($parents, '');//just a placeholder
					if ($debug) {
						echo "$nesting\{\$\n";
					}
				}
			} else {
				if ($token == '{') {
					$nesting++;
					if ($debug) {
						echo "$nesting{\n";
					}
					array_push($parents, $lastParent);
				} elseif ($token == '}') {
					if ($debug) {
						echo "$nesting}\n";
					}
					$nesting--;
					array_pop($parents);
				}
			}
		}
	}

	/**
	 * @param array $tokens
	 * @param int   $offset
	 * @return bool
	 */
	public function isEqualToAnyToken($tokens, $offset = null) {
		foreach ($tokens as $token) {
			if ($this->isEqualToToken($token, $offset)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * @param $token string|int individual token identifier or predefined T_* constant value for complex tokens
	 * @param int $offset optional offset when checking other than current
	 * @return bool
	 */
	public function isEqualToToken($token, $offset = null) {
		if ($offset === null) {
			$offset = $this->key();
		}
		if (!isset($this[$offset])) {
			return false;
		}
		$val = $this[$offset];
		if (is_string($token)) {
			//assume one char token that gets passed directly as string
			return $val == $token;
		}
		return is_array($val) && $val[0] == $token;
	}

	/**
	 * @param int $offset optional offset when checking other than current
	 * @return mixed
	 */
	public function getDefiningFunctionName($offset = null) {
		if ($offset === null) {
			$offset = $this->key();
		}
		$parentKey = $this->tokens[$offset][3];
		while ($parentKey !== null && !$this->isEqualToToken(T_FUNCTION, $parentKey - 2)) {
			$parentKey = $this->tokens[$parentKey][3];
		}
		if ($parentKey !== null) {
			$class = $this->getDefiningClassName($parentKey);
			if ($class) {
				return $class . '::' . $this->tokens[$parentKey][1];
			} else {
				return $this->tokens[$parentKey][1];
			}
		}
		return null;
	}

	/**
	 * @param int $offset optional offset when checking other than current
	 * @return mixed
	 */
	public function getDefiningClassName($offset = null) {
		if ($offset === null) {
			$offset = $this->key();
		}
		$parentKey = $this->tokens[$offset][3];
		while ($parentKey !== null && !$this->isEqualToToken(T_CLASS, $parentKey - 2)) {
			$parentKey = $this->tokens[$parentKey][3];
		}
		if ($parentKey !== null) {
			return $this->tokens[$parentKey][1];
		}
		return null;
	}

	/**
	 * @param string $fileName
	 * @return bool|string
	 * @throws \CodeReview\IOException
	 */
	public function exportPhp($fileName = null) {
		$source = '';
		$data = $this->tokens;
		reset($data);
		foreach ($data as $val) {
			if (is_array($val)) {
				$source .= $val[1];
			} else {
				$source .= $val;
			}
		}

		if ($fileName !== null) {
			if (!is_writable($fileName)) {
				throw new IOException("$fileName must be writable");
			}
			return file_put_contents($fileName, $source) !== false;
		} else {
			return $source;
		}
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Return the current element
	 *
	 * @link http://php.net/manual/en/iterator.current.php
	 * @return mixed Can return any type.
	 */
	public function current() {
		return current($this->tokens);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Move forward to next element
	 * @link http://php.net/manual/en/iterator.next.php
	 * @return void Any returned value is ignored.
	 */
	public function next() {
		next($this->tokens);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Return the key of the current element
	 * @link http://php.net/manual/en/iterator.key.php
	 * @return mixed scalar on success, or null on failure.
	 */
	public function key() {
		return key($this->tokens);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Checks if current position is valid
	 * @link http://php.net/manual/en/iterator.valid.php
	 * @return boolean The return value will be casted to boolean and then evaluated.
	 *       Returns true on success or false on failure.
	 */
	public function valid() {
		$key = key($this->tokens);
		$var = ($key !== null && $key !== false);
		return $var;
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Rewind the Iterator to the first element
	 * @link http://php.net/manual/en/iterator.rewind.php
	 * @return void Any returned value is ignored.
	 */
	public function rewind() {
		reset($this->tokens);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Whether a offset exists
	 * @link http://php.net/manual/en/arrayaccess.offsetexists.php
	 * @param mixed $offset <p>
	 *                      An offset to check for.
	 * </p>
	 * @return boolean true on success or false on failure.
	 * </p>
	 * <p>
	 *       The return value will be casted to boolean if non-boolean was returned.
	 */
	public function offsetExists($offset) {
		return isset($this->tokens[$offset]);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Offset to retrieve
	 * @link http://php.net/manual/en/arrayaccess.offsetget.php
	 * @param mixed $offset <p>
	 *                      The offset to retrieve.
	 * </p>
	 * @return mixed Can return all value types.
	 */
	public function offsetGet($offset) {
		return $this->tokens[$offset];
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Offset to set
	 * @link http://php.net/manual/en/arrayaccess.offsetset.php
	 * @param mixed $offset <p>
	 *                      The offset to assign the value to.
	 * </p>
	 * @param mixed $value  <p>
	 *                      The value to set.
	 * </p>
	 * @return void
	 */
	public function offsetSet($offset, $value) {
		$this->tokens[$offset] = $value;
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Offset to unset
	 * @link http://php.net/manual/en/arrayaccess.offsetunset.php
	 * @param mixed $offset <p>
	 *                      The offset to unset.
	 * </p>
	 * @return void
	 */
	public function offsetUnset($offset) {
		unset($this->tokens[$offset]);
	}
}

1		<?php
2		namespace CodeReview;
3
4		/**
5		* Splits file source to tokens, provides ways to manipulate tokens list and output modified source.
6		* Intended to help in code replacements on language syntax level.
7		*/
8		class PhpFileParser implements \Iterator, \ArrayAccess {
9
10		/**
11		* @var string original file name
12		*/
13		private $fileName = null;
14
15		/**
16		* @var array
17		*/
18		private $tokens = null;
19
20		/**
21		* @var string
22		*/
23		private $sha1hash = null;
24
25		/**
26		* @param $fileName
27		* @throws \CodeReview\IOException
28		* @throws Exception
29		*/
30	21	public function __construct($fileName) {
31	21	$this->validateFilePath($fileName);
32	19	$this->fileName = $fileName;
33
34	19	$contents = file_get_contents($fileName);
35	19	if ($contents === false) {
36		throw new IOException("Error while fetching contents of file $fileName");
37		}
38
39	19	$this->sha1hash = sha1_file($fileName);
40	19	if ($this->sha1hash === false) {
41		throw new IOException("Error while computing SHA1 hash of file $fileName");
42		}
43
44	19	$this->tokens = token_get_all($contents);
45	19	if (!is_array($this->tokens)) {
46		throw new \Exception("Failed to parse PHP contents of $fileName");
47		}
48	19	$this->computeNestingParentTokens();
49	19	}
50
51		/**
52		* Return fileds to serialize.
53		*
54		* @return array
55		*/
56	6	public function __sleep() {
57	6	return array('fileName', 'sha1hash', 'tokens');
58		}
59
60		/**
61		* Verify class contents against original file to detect changes.
62		*/
63	6	public function __wakeup() {
64	6	$this->validateFileContents();
65	2	}
66
67		/**
68		* Uses SHA1 hash to determine if file contents has changed since analysis.
69		*
70		* @return bool
71		* @throws \CodeReview\IOException
72		* @throws LogicException
73		*/
74	6	protected function validateFileContents() {
75	6	if (!$this->fileName) {
76	1	throw new \LogicException("Missing file's path. Looks like severe internal error.");
77		}
78	5	$this->validateFilePath($this->fileName);
79	4	if (!$this->sha1hash) {
80	1	throw new \LogicException("Missing file's SHA1 hash. Looks like severe internal error.");
81		}
82	3	if ($this->sha1hash !== sha1_file($this->fileName)) {
83	1	throw new IOException("The file on disk has changed and this " . get_class($this) . " class instance is no longer valid for use. Please create fresh instance.");
84		}
85	2	return true;
86		}
87
88		/**
89		* Checks if file exists and is readable.
90		*
91		* @param $fileName
92		* @return bool
93		* @throws \CodeReview\IOException
94		*/
95	21	protected function validateFilePath($fileName) {
96	21	if (!file_exists($fileName)) {
97	2	throw new IOException("File $fileName does not exists");
98		}
99	20	if (!is_file($fileName)) {
100	1	throw new IOException("$fileName must be a file");
101		}
102	19	if (!is_readable($fileName)) {
103		throw new IOException("File $fileName is not readable");
104		}
105	19	return true;
106		}
107
108		/**
109		* Compute parents of the tokens to easily determine containing methods and classes.
110		*
111		* @param bool $debug
112		*/
113	19	private function computeNestingParentTokens($debug = false) {
114	19	$nesting = 0;
115	19	$parents = array();
116	19	$lastParent = null;
117	19	foreach ($this->tokens as $key => $token) {
118	19	if (is_array($token)) {
119		//add info about parent to array
120	19	$parent = $parents ? $parents[count($parents)-1] : null;
121	19	$this->tokens[$key][3] = $parent;
122	19	$this->tokens[$key][4] = $nesting;
123
124		//is current token possible parent in current level?
125	19	if ($this->isEqualToAnyToken(array(T_CLASS, T_INTERFACE, T_FUNCTION), $key)) {
126	19	$lastParent = $key + 2;
127	19	} elseif ($this->isEqualToAnyToken(array(T_CURLY_OPEN, T_DOLLAR_OPEN_CURLY_BRACES), $key)) {
128	7	$nesting++;
129	7	array_push($parents, '');//just a placeholder
130	7	if ($debug) {
131		echo "$nesting\{\$\n";
132		}
133	7	}
134	19	} else {
135	19	if ($token == '{') {
136	19	$nesting++;
137	19	if ($debug) {
138		echo "$nesting{\n";
139		}
140	19	array_push($parents, $lastParent);
141	19	} elseif ($token == '}') {
142	19	if ($debug) {
143		echo "$nesting}\n";
144		}
145	19	$nesting--;
146	19	array_pop($parents);
147	19	}
148		}
149	19	}
150	19	}
151
152		/**
153		* @param array $tokens
154		* @param int $offset
155		* @return bool
156		*/
157	19	public function isEqualToAnyToken($tokens, $offset = null) {
158	19	foreach ($tokens as $token) {
159	19	if ($this->isEqualToToken($token, $offset)) {
160	19	return true;
161		}
162	19	}
163	19	return false;
164		}
165
166		/**
167		* @param $token string\|int individual token identifier or predefined T_* constant value for complex tokens
168		* @param int $offset optional offset when checking other than current
169		* @return bool
170		*/
171	19	public function isEqualToToken($token, $offset = null) {
172	19	if ($offset === null) {
173		$offset = $this->key();
174		}
175	19	if (!isset($this[$offset])) {
176		return false;
177		}
178	19	$val = $this[$offset];
179	19	if (is_string($token)) {
180		//assume one char token that gets passed directly as string
181		return $val == $token;
182		}
183	19	return is_array($val) && $val[0] == $token;
184		}
185
186		/**
187		* @param int $offset optional offset when checking other than current
188		* @return mixed
189		*/
190	7	public function getDefiningFunctionName($offset = null) {
191	7	if ($offset === null) {
192		$offset = $this->key();
193		}
194	7	$parentKey = $this->tokens[$offset][3];
195	7	while ($parentKey !== null && !$this->isEqualToToken(T_FUNCTION, $parentKey - 2)) {
196		$parentKey = $this->tokens[$parentKey][3];
197		}
198	7	if ($parentKey !== null) {
199	7	$class = $this->getDefiningClassName($parentKey);
200	7	if ($class) {
201	5	return $class . '::' . $this->tokens[$parentKey][1];
202		} else {
203	5	return $this->tokens[$parentKey][1];
204		}
205		}
206		return null;
207		}
208
209		/**
210		* @param int $offset optional offset when checking other than current
211		* @return mixed
212		*/
213	7	public function getDefiningClassName($offset = null) {
214	7	if ($offset === null) {
215		$offset = $this->key();
216		}
217	7	$parentKey = $this->tokens[$offset][3];
218	7	while ($parentKey !== null && !$this->isEqualToToken(T_CLASS, $parentKey - 2)) {
219		$parentKey = $this->tokens[$parentKey][3];
220		}
221	7	if ($parentKey !== null) {
222	5	return $this->tokens[$parentKey][1];
223		}
224	5	return null;
225		}
226
227		/**
228		* @param string $fileName
229		* @return bool\|string
230		* @throws \CodeReview\IOException
231		*/
232	1	public function exportPhp($fileName = null) {
233	1	$source = '';
234	1	$data = $this->tokens;
235	1	reset($data);
236	1	foreach ($data as $val) {
237	1	if (is_array($val)) {
238	1	$source .= $val[1];
239	1	} else {
240	1	$source .= $val;
241		}
242	1	}
243
244	1	if ($fileName !== null) {
245		if (!is_writable($fileName)) {
246		throw new IOException("$fileName must be writable");
247		}
248		return file_put_contents($fileName, $source) !== false;
249		} else {
250	1	return $source;
251		}
252		}
253
254		/**
255		* (PHP 5 >= 5.0.0)<br/>
256		* Return the current element
257		*
258		* @link http://php.net/manual/en/iterator.current.php
259		* @return mixed Can return any type.
260		*/
261	12	public function current() {
262	12	return current($this->tokens);
263		}
264
265		/**
266		* (PHP 5 >= 5.0.0)<br/>
267		* Move forward to next element
268		* @link http://php.net/manual/en/iterator.next.php
269		* @return void Any returned value is ignored.
270		*/
271	12	public function next() {
272	12	next($this->tokens);
273	12	}
274
275		/**
276		* (PHP 5 >= 5.0.0)<br/>
277		* Return the key of the current element
278		* @link http://php.net/manual/en/iterator.key.php
279		* @return mixed scalar on success, or null on failure.
280		*/
281	12	public function key() {
282	12	return key($this->tokens);
283		}
284
285		/**
286		* (PHP 5 >= 5.0.0)<br/>
287		* Checks if current position is valid
288		* @link http://php.net/manual/en/iterator.valid.php
289		* @return boolean The return value will be casted to boolean and then evaluated.
290		* Returns true on success or false on failure.
291		*/
292	12	public function valid() {
293	12	$key = key($this->tokens);
294	12	$var = ($key !== null && $key !== false);
295	12	return $var;
296		}
297
298		/**
299		* (PHP 5 >= 5.0.0)<br/>
300		* Rewind the Iterator to the first element
301		* @link http://php.net/manual/en/iterator.rewind.php
302		* @return void Any returned value is ignored.
303		*/
304	12	public function rewind() {
305	12	reset($this->tokens);
306	12	}
307
308		/**
309		* (PHP 5 >= 5.0.0)<br/>
310		* Whether a offset exists
311		* @link http://php.net/manual/en/arrayaccess.offsetexists.php
312		* @param mixed $offset <p>
313		* An offset to check for.
314		* </p>
315		* @return boolean true on success or false on failure.
316		* </p>
317		* <p>
318		* The return value will be casted to boolean if non-boolean was returned.
319		*/
320	19	public function offsetExists($offset) {
321	19	return isset($this->tokens[$offset]);
322		}
323
324		/**
325		* (PHP 5 >= 5.0.0)<br/>
326		* Offset to retrieve
327		* @link http://php.net/manual/en/arrayaccess.offsetget.php
328		* @param mixed $offset <p>
329		* The offset to retrieve.
330		* </p>
331		* @return mixed Can return all value types.
332		*/
333	19	public function offsetGet($offset) {
334	19	return $this->tokens[$offset];
335		}
336
337		/**
338		* (PHP 5 >= 5.0.0)<br/>
339		* Offset to set
340		* @link http://php.net/manual/en/arrayaccess.offsetset.php
341		* @param mixed $offset <p>
342		* The offset to assign the value to.
343		* </p>
344		* @param mixed $value <p>
345		* The value to set.
346		* </p>
347		* @return void
348		*/
349		public function offsetSet($offset, $value) {
350		$this->tokens[$offset] = $value;
351		}
352
353		/**
354		* (PHP 5 >= 5.0.0)<br/>
355		* Offset to unset
356		* @link http://php.net/manual/en/arrayaccess.offsetunset.php
357		* @param mixed $offset <p>
358		* The offset to unset.
359		* </p>
360		* @return void
361		*/
362		public function offsetUnset($offset) {
363		unset($this->tokens[$offset]);
364		}
365		}

Srokap / code_review

PhpFileParser::computeNestingParentTokens() C last analyzed 2016-05-15 21:09 UTC

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PhpFileParser::computeNestingParentTokens() C
last analyzed 2016-05-15 21:09 UTC