NewClosureSniff::findThisUsageInClosure() - Code Metrics - Inspection of "PHP 5.4: NewClosure: report on `self/parent/static..." - wimg/PHPCompatibility - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — feature/668-self-in-closures ( 295b9f )

by Juliette

created 2018-06-15 22:55 UTC

NewClosureSniff::findThisUsageInClosure() A

↳ Parent: NewClosureSniff

Complexity

Conditions	2
Paths	2

Size

Total Lines	15
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	15
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	9
nc	2
nop	3

<?php
/**
 * \PHPCompatibility\Sniffs\PHP\NewClosure.
 *
 * PHP version 5.3
 *
 * @category PHP
 * @package  PHPCompatibility
 * @author   Wim Godden <[email protected]>
 */

namespace PHPCompatibility\Sniffs\PHP;

use PHPCompatibility\Sniff;

/**
 * \PHPCompatibility\Sniffs\PHP\NewClosure.
 *
 * Closures are available since PHP 5.3
 *
 * PHP version 5.3
 *
 * @category PHP
 * @package  PHPCompatibility
 * @author   Wim Godden <[email protected]>
 */
class NewClosureSniff extends Sniff
{
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array
     */
    public function register()
    {
        return array(T_CLOSURE);

    }//end register()

    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
     * @param int                   $stackPtr  The position of the current token
     *                                         in the stack passed in $tokens.
     *
     * @return void
     */
    public function process(\PHP_CodeSniffer_File $phpcsFile, $stackPtr)
    {
        if ($this->supportsBelow('5.2')) {
            $phpcsFile->addError(
                'Closures / anonymous functions are not available in PHP 5.2 or earlier',
                $stackPtr,
                'Found'
            );
        }

        /*
         * Closures can only be declared as static since PHP 5.4.
         */
        $isStatic = $this->isClosureStatic($phpcsFile, $stackPtr);
        if ($this->supportsBelow('5.3') && $isStatic === true) {
            $phpcsFile->addError(
                'Closures / anonymous functions could not be declared as static in PHP 5.3 or earlier',
                $stackPtr,
                'StaticFound'
            );
        }

        $tokens = $phpcsFile->getTokens();

        if (isset($tokens[$stackPtr]['scope_opener'], $tokens[$stackPtr]['scope_closer']) === false) {
            // Live coding or parse error.
            return;
        }

        $scopeStart = ($tokens[$stackPtr]['scope_opener'] + 1);
        $scopeEnd   = $tokens[$stackPtr]['scope_closer'];
        $usesThis   = $this->findThisUsageInClosure($phpcsFile, $scopeStart, $scopeEnd);

        if ($this->supportsBelow('5.3')) {
            /*
             * Closures declared within classes only have access to $this since PHP 5.4.
             */
            if ($usesThis !== false) {
                $thisFound = $usesThis;
                do {
                    $phpcsFile->addError(
                        'Closures / anonymous functions did not have access to $this in PHP 5.3 or earlier',
                        $thisFound,
                        'ThisFound'
                    );

                    $thisFound = $this->findThisUsageInClosure($phpcsFile, ($thisFound + 1), $scopeEnd);

                } while ($thisFound !== false);
            }

            /*
             * Closures declared within classes only have access to self/parent/static since PHP 5.4.
             */
            $usesClassRef = $this->findClassRefUsageInClosure($phpcsFile, $scopeStart, $scopeEnd);

            if ($usesClassRef !== false) {
                do {
                    $phpcsFile->addError(
                        'Closures / anonymous functions could not use "%s::" in PHP 5.3 or earlier',
                        $usesClassRef,
                        'ClassRefFound',
                        array(strtolower($tokens[$usesClassRef]['content']))
                    );

                    $usesClassRef = $this->findClassRefUsageInClosure($phpcsFile, ($usesClassRef + 1), $scopeEnd);

                } while ($usesClassRef !== false);
            }
        }

        /*
         * Check for correct usage.
         */
        if ($this->supportsAbove('5.4') && $usesThis !== false) {

            $thisFound = $usesThis;

            do {
                /*
                 * Closures only have access to $this if not declared as static.
                 */
                if ($isStatic === true) {
                    $phpcsFile->addError(
                        'Closures / anonymous functions declared as static do not have access to $this',
                        $thisFound,
                        'ThisFoundInStatic'
                    );
                }

                /*
                 * Closures only have access to $this if used within a class context.
                 */
                elseif ($this->inClassScope($phpcsFile, $stackPtr, false) === false) {
                    $phpcsFile->addWarning(
                        'Closures / anonymous functions only have access to $this if used within a class or when bound to an object using bindTo(). Please verify.',
                        $thisFound,
                        'ThisFoundOutsideClass'
                    );
                }

                $thisFound = $this->findThisUsageInClosure($phpcsFile, ($thisFound + 1), $scopeEnd);

            } while ($thisFound !== false);
        }

        // Prevent double reporting for nested closures.
        return $scopeEnd;

    }//end process()


    /**
     * Check whether the closure is declared as static.
     *
     * @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
     * @param int                   $stackPtr  The position of the current token
     *                                         in the stack passed in $tokens.
     *
     * @return bool
     */
    protected function isClosureStatic(\PHP_CodeSniffer_File $phpcsFile, $stackPtr)
    {
        $tokens    = $phpcsFile->getTokens();
        $prevToken = $phpcsFile->findPrevious(\PHP_CodeSniffer_Tokens::$emptyTokens, ($stackPtr - 1), null, true, null, true);

        return ($prevToken !== false && $tokens[$prevToken]['code'] === T_STATIC);
    }


    /**
     * Check if the code within a closure uses the $this variable.
     *
     * @param \PHP_CodeSniffer_File $phpcsFile  The file being scanned.
     * @param int                   $startToken The position within the closure to continue searching from.
     * @param int                   $endToken   The closure scope closer to stop searching at.
     *
     * @return int|false The stackPtr to the first $this usage if found or false if
     *                   $this is not used.
     */
    protected function findThisUsageInClosure(\PHP_CodeSniffer_File $phpcsFile, $startToken, $endToken)
    {
        // Make sure the $startToken is valid.
        if ($startToken >= $endToken) {
            return false;
        }

        return $phpcsFile->findNext(
            T_VARIABLE,
            $startToken,
            $endToken,
            false,
            '$this'
        );
    }

    /**
     * Check if the code within a closure uses "self/parent/static".
     *
     * @param \PHP_CodeSniffer_File $phpcsFile  The file being scanned.
     * @param int                   $startToken The position within the closure to continue searching from.
     * @param int                   $endToken   The closure scope closer to stop searching at.
     *
     * @return int|false The stackPtr to the first classRef usage if found or false if
     *                   they are not used.
     */
    protected function findClassRefUsageInClosure(\PHP_CodeSniffer_File $phpcsFile, $startToken, $endToken)
    {
        // Make sure the $startToken is valid.
        if ($startToken >= $endToken) {
            return false;
        }

        $tokens   = $phpcsFile->getTokens();
        $classRef = $phpcsFile->findNext(array(T_SELF, T_PARENT, T_STATIC), $startToken, $endToken);

        if ($classRef === false || $tokens[$classRef]['code'] !== T_STATIC) {
            return $classRef;
        }

        // T_STATIC, make sure it is used as a class reference.
        $next = $phpcsFile->findNext(\PHP_CodeSniffer_Tokens::$emptyTokens, ($classRef + 1), $endToken, true);
        if ($next === false || $tokens[$next]['code'] !== T_DOUBLE_COLON) {
            return false;
        }

        return $classRef;
    }

}//end class


1		<?php
2		/**
3		* \PHPCompatibility\Sniffs\PHP\NewClosure.
4		*
5		* PHP version 5.3
6		*
7		* @category PHP
8		* @package PHPCompatibility
9		* @author Wim Godden <[email protected]>
10		*/
11
12		namespace PHPCompatibility\Sniffs\PHP;
13
14		use PHPCompatibility\Sniff;
15
16		/**
17		* \PHPCompatibility\Sniffs\PHP\NewClosure.
18		*
19		* Closures are available since PHP 5.3
20		*
21		* PHP version 5.3
22		*
23		* @category PHP
24		* @package PHPCompatibility
25		* @author Wim Godden <[email protected]>
26		*/
27		class NewClosureSniff extends Sniff
28		{
29		/**
30		* Returns an array of tokens this test wants to listen for.
31		*
32		* @return array
33		*/
34		public function register()
35		{
36		return array(T_CLOSURE);
37
38		}//end register()
39
40		/**
41		* Processes this test, when one of its tokens is encountered.
42		*
43		* @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
44		* @param int $stackPtr The position of the current token
45		* in the stack passed in $tokens.
46		*
47		* @return void
48		*/
49		public function process(\PHP_CodeSniffer_File $phpcsFile, $stackPtr)
50		{
51		if ($this->supportsBelow('5.2')) {
52		$phpcsFile->addError(
53		'Closures / anonymous functions are not available in PHP 5.2 or earlier',
54		$stackPtr,
55		'Found'
56		);
57		}
58
59		/*
60		* Closures can only be declared as static since PHP 5.4.
61		*/
62		$isStatic = $this->isClosureStatic($phpcsFile, $stackPtr);
63		if ($this->supportsBelow('5.3') && $isStatic === true) {
64		$phpcsFile->addError(
65		'Closures / anonymous functions could not be declared as static in PHP 5.3 or earlier',
66		$stackPtr,
67		'StaticFound'
68		);
69		}
70
71		$tokens = $phpcsFile->getTokens();
72
73		if (isset($tokens[$stackPtr]['scope_opener'], $tokens[$stackPtr]['scope_closer']) === false) {
74		// Live coding or parse error.
75		return;
76		}
77
78		$scopeStart = ($tokens[$stackPtr]['scope_opener'] + 1);
79		$scopeEnd = $tokens[$stackPtr]['scope_closer'];
80		$usesThis = $this->findThisUsageInClosure($phpcsFile, $scopeStart, $scopeEnd);
81
82		if ($this->supportsBelow('5.3')) {
83		/*
84		* Closures declared within classes only have access to $this since PHP 5.4.
85		*/
86		if ($usesThis !== false) {
87		$thisFound = $usesThis;
88		do {
89		$phpcsFile->addError(
90		'Closures / anonymous functions did not have access to $this in PHP 5.3 or earlier',
91		$thisFound,
92		'ThisFound'
93		);
94
95		$thisFound = $this->findThisUsageInClosure($phpcsFile, ($thisFound + 1), $scopeEnd);
96
97		} while ($thisFound !== false);
98		}
99
100		/*
101		* Closures declared within classes only have access to self/parent/static since PHP 5.4.
102		*/
103		$usesClassRef = $this->findClassRefUsageInClosure($phpcsFile, $scopeStart, $scopeEnd);
104
105		if ($usesClassRef !== false) {
106		do {
107		$phpcsFile->addError(
108		'Closures / anonymous functions could not use "%s::" in PHP 5.3 or earlier',
109		$usesClassRef,
110		'ClassRefFound',
111		array(strtolower($tokens[$usesClassRef]['content']))
112		);
113
114		$usesClassRef = $this->findClassRefUsageInClosure($phpcsFile, ($usesClassRef + 1), $scopeEnd);
115
116		} while ($usesClassRef !== false);
117		}
118		}
119
120		/*
121		* Check for correct usage.
122		*/
123		if ($this->supportsAbove('5.4') && $usesThis !== false) {
124
125		$thisFound = $usesThis;
126
127		do {
128		/*
129		* Closures only have access to $this if not declared as static.
130		*/
131		if ($isStatic === true) {
132		$phpcsFile->addError(
133		'Closures / anonymous functions declared as static do not have access to $this',
134		$thisFound,
135		'ThisFoundInStatic'
136		);
137		}
138
139		/*
140		* Closures only have access to $this if used within a class context.
141		*/
142		elseif ($this->inClassScope($phpcsFile, $stackPtr, false) === false) {
143		$phpcsFile->addWarning(
144		'Closures / anonymous functions only have access to $this if used within a class or when bound to an object using bindTo(). Please verify.',
145		$thisFound,
146		'ThisFoundOutsideClass'
147		);
148		}
149
150		$thisFound = $this->findThisUsageInClosure($phpcsFile, ($thisFound + 1), $scopeEnd);
151
152		} while ($thisFound !== false);
153		}
154
155		// Prevent double reporting for nested closures.
156		return $scopeEnd;
157
158		}//end process()
159
160
161		/**
162		* Check whether the closure is declared as static.
163		*
164		* @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
165		* @param int $stackPtr The position of the current token
166		* in the stack passed in $tokens.
167		*
168		* @return bool
169		*/
170		protected function isClosureStatic(\PHP_CodeSniffer_File $phpcsFile, $stackPtr)
171		{
172		$tokens = $phpcsFile->getTokens();
173		$prevToken = $phpcsFile->findPrevious(\PHP_CodeSniffer_Tokens::$emptyTokens, ($stackPtr - 1), null, true, null, true);
174
175		return ($prevToken !== false && $tokens[$prevToken]['code'] === T_STATIC);
176		}
177
178
179		/**
180		* Check if the code within a closure uses the $this variable.
181		*
182		* @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
183		* @param int $startToken The position within the closure to continue searching from.
184		* @param int $endToken The closure scope closer to stop searching at.
185		*
186		* @return int\|false The stackPtr to the first $this usage if found or false if
187		* $this is not used.
188		*/
189		protected function findThisUsageInClosure(\PHP_CodeSniffer_File $phpcsFile, $startToken, $endToken)
190		{
191		// Make sure the $startToken is valid.
192		if ($startToken >= $endToken) {
193		return false;
194		}
195
196		return $phpcsFile->findNext(
197		T_VARIABLE,
198		$startToken,
199		$endToken,
200		false,
201		'$this'
202		);
203		}
204
205		/**
206		* Check if the code within a closure uses "self/parent/static".
207		*
208		* @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
209		* @param int $startToken The position within the closure to continue searching from.
210		* @param int $endToken The closure scope closer to stop searching at.
211		*
212		* @return int\|false The stackPtr to the first classRef usage if found or false if
213		* they are not used.
214		*/
215		protected function findClassRefUsageInClosure(\PHP_CodeSniffer_File $phpcsFile, $startToken, $endToken)
216		{
217		// Make sure the $startToken is valid.
218		if ($startToken >= $endToken) {
219		return false;
220		}
221
222		$tokens = $phpcsFile->getTokens();
223		$classRef = $phpcsFile->findNext(array(T_SELF, T_PARENT, T_STATIC), $startToken, $endToken);
224
225		if ($classRef === false \|\| $tokens[$classRef]['code'] !== T_STATIC) {
226		return $classRef;
227		}
228
229		// T_STATIC, make sure it is used as a class reference.
230		$next = $phpcsFile->findNext(\PHP_CodeSniffer_Tokens::$emptyTokens, ($classRef + 1), $endToken, true);
231	View Code Duplication	if ($next === false \|\| $tokens[$next]['code'] !== T_DOUBLE_COLON) {
232		return false;
233		}
234
235		return $classRef;
236		}
237
238		}//end class
239

wimg / PHPCompatibility

Push — feature/668-self-in-closures ( 295b9f )

NewClosureSniff::findThisUsageInClosure() A

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