17174734458

Committed 23 Aug 2025 11:06AM UTC coverage: 76.88% (-2.1%) from 78.934%

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TEMP/TESTING PHPUnit 6331

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/src/Standards/Squiz/Sniffs/PHP/NonExecutableCodeSniff.php

<?php
/**
 * Warns about code that can never been executed.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Standards\Squiz\Sniffs\PHP;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;
use PHP_CodeSniffer\Util\Tokens;

class NonExecutableCodeSniff implements Sniff
{

    /**
     * Tokens for terminating expressions, which can be used inline.
     *
     * This is in contrast to terminating statements, which cannot be used inline
     * and would result in a parse error (which is not the concern of this sniff).
     *
     * `throw` can be used as an expression since PHP 8.0.
     * {@link https://wiki.php.net/rfc/throw_expression}
     *
     * @var array
     */
    private $expressionTokens = [
        T_EXIT  => T_EXIT,
        T_THROW => T_THROW,
    ];


    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register()
    {
        return [
            T_BREAK,
            T_CONTINUE,
            T_RETURN,
            T_THROW,
            T_EXIT,
            T_GOTO,
        ];

    }//end register()


    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\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(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

        $prev = $phpcsFile->findPrevious(Tokens::EMPTY_TOKENS, ($stackPtr - 1), null, true);

        // Tokens which can be used in inline expressions need special handling.
        if (isset($this->expressionTokens[$tokens[$stackPtr]['code']]) === true) {
            // If this token is preceded by a logical operator, it only relates to one line
            // and should be ignored. For example: fopen() or die().
            // Note: There is one exception: throw expressions can not be used with xor.
            if (isset(Tokens::BOOLEAN_OPERATORS[$tokens[$prev]['code']]) === true
                && ($tokens[$stackPtr]['code'] === T_THROW && $tokens[$prev]['code'] === T_LOGICAL_XOR) === false
            ) {
                return;
            }

            // Expressions are allowed in the `else` clause of ternaries.
            if ($tokens[$prev]['code'] === T_INLINE_THEN || $tokens[$prev]['code'] === T_INLINE_ELSE) {
                return;
            }

            // Expressions are allowed with PHP 7.0+ null coalesce and PHP 7.4+ null coalesce equals.
            if ($tokens[$prev]['code'] === T_COALESCE || $tokens[$prev]['code'] === T_COALESCE_EQUAL) {
                return;
            }

            // Expressions are allowed in arrow functions.
            if ($tokens[$prev]['code'] === T_FN_ARROW) {
                return;
            }
        }//end if

        // This token may be part of an inline condition.
        // If we find a closing parenthesis that belongs to a condition,
        // or an "else", we should ignore this token.
        if ($tokens[$prev]['code'] === T_ELSE
            || (isset($tokens[$prev]['parenthesis_owner']) === true
            && ($tokens[$tokens[$prev]['parenthesis_owner']]['code'] === T_IF
            || $tokens[$tokens[$prev]['parenthesis_owner']]['code'] === T_ELSEIF))
        ) {
            return;
        }

        if ($tokens[$stackPtr]['code'] === T_RETURN) {
            $next = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($stackPtr + 1), null, true);
            if ($tokens[$next]['code'] === T_SEMICOLON) {
                $next = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($next + 1), null, true);
                if ($tokens[$next]['code'] === T_CLOSE_CURLY_BRACKET) {
                    // If this is the closing brace of a function
                    // then this return statement doesn't return anything
                    // and is not required anyway.
                    $owner = $tokens[$next]['scope_condition'];
                    if ($tokens[$owner]['code'] === T_FUNCTION
                        || $tokens[$owner]['code'] === T_CLOSURE
                    ) {
                        $warning = 'Empty return statement not required here';
                        $phpcsFile->addWarning($warning, $stackPtr, 'ReturnNotRequired');
                        return;
                    }
                }
            }
        }

        if (isset($tokens[$stackPtr]['scope_opener']) === true) {
            $owner = $tokens[$stackPtr]['scope_condition'];
            if ($tokens[$owner]['code'] === T_CASE || $tokens[$owner]['code'] === T_DEFAULT) {
                // This token closes the scope of a CASE or DEFAULT statement
                // so any code between this statement and the next CASE, DEFAULT or
                // end of SWITCH token will not be executable.
                $end  = $phpcsFile->findEndOfStatement($stackPtr);
                $next = $phpcsFile->findNext(
                    [
                        T_CASE,
                        T_DEFAULT,
                        T_CLOSE_CURLY_BRACKET,
                        T_ENDSWITCH,
                    ],
                    ($end + 1)
                );

                if ($next !== false) {
                    $lastLine = $tokens[$end]['line'];
                    for ($i = ($stackPtr + 1); $i < $next; $i++) {
                        if (isset(Tokens::EMPTY_TOKENS[$tokens[$i]['code']]) === true) {
                            continue;
                        }

                        $line = $tokens[$i]['line'];
                        if ($line > $lastLine) {
                            $type    = substr($tokens[$stackPtr]['type'], 2);
                            $warning = 'Code after the %s statement on line %s cannot be executed';
                            $data    = [
                                $type,
                                $tokens[$stackPtr]['line'],
                            ];
                            $phpcsFile->addWarning($warning, $i, 'Unreachable', $data);
                            $lastLine = $line;
                        }
                    }
                }//end if

                // That's all we have to check for these types of statements.
                return;
            }//end if
        }//end if

        $ourConditions = array_keys($tokens[$stackPtr]['conditions']);

        if (empty($ourConditions) === false) {
            $condition = array_pop($ourConditions);

            if (isset($tokens[$condition]['scope_closer']) === false) {
                return;
            }

            // Special case for BREAK statements sitting directly inside SWITCH
            // statements. If we get to this point, we know the BREAK is not being
            // used to close a CASE statement, so it is most likely non-executable
            // code itself (as is the case when you put return; break; at the end of
            // a case). So we need to ignore this token.
            if ($tokens[$condition]['code'] === T_SWITCH
                && $tokens[$stackPtr]['code'] === T_BREAK
            ) {
                return;
            }

            $closer = $tokens[$condition]['scope_closer'];

            // If the closer for our condition is shared with other openers,
            // we will need to throw errors from this token to the next
            // shared opener (if there is one), not to the scope closer.
            $nextOpener = null;
            for ($i = ($stackPtr + 1); $i < $closer; $i++) {
                if (isset($tokens[$i]['scope_closer']) === true) {
                    if ($tokens[$i]['scope_closer'] === $closer) {
                        // We found an opener that shares the same
                        // closing token as us.
                        $nextOpener = $i;
                        break;
                    }
                }
            }//end for

            if ($nextOpener === null) {
                $end = $closer;
            } else {
                $end = ($nextOpener - 1);
            }
        } else {
            // This token is in the global scope.
            if ($tokens[$stackPtr]['code'] === T_BREAK) {
                return;
            }

            // Throw an error for all lines until the end of the file.
            $end = ($phpcsFile->numTokens - 1);
        }//end if

        // Find the semicolon or closing PHP tag that ends this statement,
        // skipping nested statements like FOR loops and closures.
        for ($start = ($stackPtr + 1); $start < $phpcsFile->numTokens; $start++) {
            if ($start === $end) {
                break;
            }

            if (isset($tokens[$start]['parenthesis_closer']) === true
                && $tokens[$start]['code'] === T_OPEN_PARENTHESIS
            ) {
                $start = $tokens[$start]['parenthesis_closer'];
                continue;
            }

            if (isset($tokens[$start]['bracket_closer']) === true
                && $tokens[$start]['code'] === T_OPEN_CURLY_BRACKET
            ) {
                $start = $tokens[$start]['bracket_closer'];
                continue;
            }

            if ($tokens[$start]['code'] === T_SEMICOLON || $tokens[$start]['code'] === T_CLOSE_TAG) {
                break;
            }
        }//end for

        if (isset($tokens[$start]) === false) {
            return;
        }

        $lastLine = $tokens[$start]['line'];
        for ($i = ($start + 1); $i < $end; $i++) {
            if (isset(Tokens::EMPTY_TOKENS[$tokens[$i]['code']]) === true
                || isset(Tokens::BRACKET_TOKENS[$tokens[$i]['code']]) === true
                || $tokens[$i]['code'] === T_SEMICOLON
            ) {
                continue;
            }

            // Skip whole functions and classes/interfaces because they are not
            // technically executed code, but rather declarations that may be used.
            if (isset(Tokens::OO_SCOPE_TOKENS[$tokens[$i]['code']]) === true
                || $tokens[$i]['code'] === T_FUNCTION
                || $tokens[$i]['code'] === T_CLOSURE
            ) {
                if (isset($tokens[$i]['scope_closer']) === false) {
                    // Parse error/Live coding.
                    return;
                }

                $i = $tokens[$i]['scope_closer'];
                continue;
            }

            // Skip HTML whitespace.
            if ($tokens[$i]['code'] === T_INLINE_HTML && trim($tokens[$i]['content']) === '') {
                continue;
            }

            // Skip PHP re-open tag (eg, after inline HTML).
            if ($tokens[$i]['code'] === T_OPEN_TAG) {
                continue;
            }

            $line = $tokens[$i]['line'];
            if ($line > $lastLine) {
                $type    = substr($tokens[$stackPtr]['type'], 2);
                $warning = 'Code after the %s statement on line %s cannot be executed';
                $data    = [
                    $type,
                    $tokens[$stackPtr]['line'],
                ];
                $phpcsFile->addWarning($warning, $i, 'Unreachable', $data);
                $lastLine = $line;
            }
        }//end for

    }//end process()


}//end class

1	<?php
2	/**
3	* Warns about code that can never been executed.
4	*
5	* @author Greg Sherwood <gsherwood@squiz.net>
6	* @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
7	* @license https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
8	*/
9
10	namespace PHP_CodeSniffer\Standards\Squiz\Sniffs\PHP;
11
12	use PHP_CodeSniffer\Files\File;
13	use PHP_CodeSniffer\Sniffs\Sniff;
14	use PHP_CodeSniffer\Util\Tokens;
15
16	class NonExecutableCodeSniff implements Sniff
17	{
18
19	/**
20	* Tokens for terminating expressions, which can be used inline.
21	*
22	* This is in contrast to terminating statements, which cannot be used inline
23	* and would result in a parse error (which is not the concern of this sniff).
24	*
25	* `throw` can be used as an expression since PHP 8.0.
26	* {@link https://wiki.php.net/rfc/throw_expression}
27	*
28	* @var array
29	*/
30	private $expressionTokens = [
31	T_EXIT => T_EXIT,
32	T_THROW => T_THROW,
33	];
34
35
36	/**
37	* Returns an array of tokens this test wants to listen for.
38	*
39	* @return array<int\|string>
40	*/
41	public function register()	2✔
42	{
43	return [	2✔
44	T_BREAK,	2✔
45	T_CONTINUE,	2✔
46	T_RETURN,	2✔
47	T_THROW,	2✔
48	T_EXIT,	2✔
49	T_GOTO,	2✔
50	];	2✔
51
52	}//end register()
53
54
55	/**
56	* Processes this test, when one of its tokens is encountered.
57	*
58	* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
59	* @param int $stackPtr The position of the current token in
60	* the stack passed in $tokens.
61	*
62	* @return void
63	*/
64	public function process(File $phpcsFile, $stackPtr)	2✔
65	{
66	$tokens = $phpcsFile->getTokens();	2✔
67
68	$prev = $phpcsFile->findPrevious(Tokens::EMPTY_TOKENS, ($stackPtr - 1), null, true);	2✔
69
70	// Tokens which can be used in inline expressions need special handling.
71	if (isset($this->expressionTokens[$tokens[$stackPtr]['code']]) === true) {	2✔
72	// If this token is preceded by a logical operator, it only relates to one line
73	// and should be ignored. For example: fopen() or die().
74	// Note: There is one exception: throw expressions can not be used with xor.
75	if (isset(Tokens::BOOLEAN_OPERATORS[$tokens[$prev]['code']]) === true	2✔
76	&& ($tokens[$stackPtr]['code'] === T_THROW && $tokens[$prev]['code'] === T_LOGICAL_XOR) === false	2✔
77	) {
78	return;	2✔
79	}
80
81	// Expressions are allowed in the `else` clause of ternaries.
82	if ($tokens[$prev]['code'] === T_INLINE_THEN \|\| $tokens[$prev]['code'] === T_INLINE_ELSE) {	2✔
83	return;	2✔
84	}
85
86	// Expressions are allowed with PHP 7.0+ null coalesce and PHP 7.4+ null coalesce equals.
87	if ($tokens[$prev]['code'] === T_COALESCE \|\| $tokens[$prev]['code'] === T_COALESCE_EQUAL) {	2✔
88	return;	2✔
89	}
90
91	// Expressions are allowed in arrow functions.
92	if ($tokens[$prev]['code'] === T_FN_ARROW) {	2✔
93	return;	2✔
94	}
95	}//end if
96
97	// This token may be part of an inline condition.
98	// If we find a closing parenthesis that belongs to a condition,
99	// or an "else", we should ignore this token.
100	if ($tokens[$prev]['code'] === T_ELSE	2✔
101	\|\| (isset($tokens[$prev]['parenthesis_owner']) === true	2✔
102	&& ($tokens[$tokens[$prev]['parenthesis_owner']]['code'] === T_IF	2✔
103	\|\| $tokens[$tokens[$prev]['parenthesis_owner']]['code'] === T_ELSEIF))	2✔
104	) {
105	return;	2✔
106	}
107
108	if ($tokens[$stackPtr]['code'] === T_RETURN) {	2✔
109	$next = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($stackPtr + 1), null, true);	2✔
110	if ($tokens[$next]['code'] === T_SEMICOLON) {	2✔
111	$next = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($next + 1), null, true);	2✔
112	if ($tokens[$next]['code'] === T_CLOSE_CURLY_BRACKET) {	2✔
113	// If this is the closing brace of a function
114	// then this return statement doesn't return anything
115	// and is not required anyway.
116	$owner = $tokens[$next]['scope_condition'];	2✔
117	if ($tokens[$owner]['code'] === T_FUNCTION	2✔
118	\|\| $tokens[$owner]['code'] === T_CLOSURE	2✔
119	) {
120	$warning = 'Empty return statement not required here';	2✔
121	$phpcsFile->addWarning($warning, $stackPtr, 'ReturnNotRequired');	2✔
122	return;	2✔
123	}
124	}
125	}
126	}
127
128	if (isset($tokens[$stackPtr]['scope_opener']) === true) {	2✔
129	$owner = $tokens[$stackPtr]['scope_condition'];	2✔
130	if ($tokens[$owner]['code'] === T_CASE \|\| $tokens[$owner]['code'] === T_DEFAULT) {	2✔
131	// This token closes the scope of a CASE or DEFAULT statement
132	// so any code between this statement and the next CASE, DEFAULT or
133	// end of SWITCH token will not be executable.
134	$end = $phpcsFile->findEndOfStatement($stackPtr);	2✔
135	$next = $phpcsFile->findNext(	2✔
136	[	2✔
137	T_CASE,	2✔
138	T_DEFAULT,	2✔
139	T_CLOSE_CURLY_BRACKET,	2✔
140	T_ENDSWITCH,	2✔
141	],	2✔
142	($end + 1)	2✔
143	);	2✔
144
145	if ($next !== false) {	2✔
146	$lastLine = $tokens[$end]['line'];	2✔
147	for ($i = ($stackPtr + 1); $i < $next; $i++) {	2✔
148	if (isset(Tokens::EMPTY_TOKENS[$tokens[$i]['code']]) === true) {	2✔
149	continue;	2✔
150	}
151
152	$line = $tokens[$i]['line'];	2✔
153	if ($line > $lastLine) {	2✔
154	$type = substr($tokens[$stackPtr]['type'], 2);	2✔
155	$warning = 'Code after the %s statement on line %s cannot be executed';	2✔
156	$data = [	2✔
157	$type,	2✔
158	$tokens[$stackPtr]['line'],	2✔
159	];	2✔
160	$phpcsFile->addWarning($warning, $i, 'Unreachable', $data);	2✔
161	$lastLine = $line;	2✔
162	}
163	}
164	}//end if
165
166	// That's all we have to check for these types of statements.
167	return;	2✔
168	}//end if
169	}//end if
170
171	$ourConditions = array_keys($tokens[$stackPtr]['conditions']);	2✔
172
173	if (empty($ourConditions) === false) {	2✔
174	$condition = array_pop($ourConditions);	2✔
175
176	if (isset($tokens[$condition]['scope_closer']) === false) {	2✔
177	return;	×
178	}
179
180	// Special case for BREAK statements sitting directly inside SWITCH
181	// statements. If we get to this point, we know the BREAK is not being
182	// used to close a CASE statement, so it is most likely non-executable
183	// code itself (as is the case when you put return; break; at the end of
184	// a case). So we need to ignore this token.
185	if ($tokens[$condition]['code'] === T_SWITCH	2✔
186	&& $tokens[$stackPtr]['code'] === T_BREAK	2✔
187	) {
188	return;	2✔
189	}
190
191	$closer = $tokens[$condition]['scope_closer'];	2✔
192
193	// If the closer for our condition is shared with other openers,
194	// we will need to throw errors from this token to the next
195	// shared opener (if there is one), not to the scope closer.
196	$nextOpener = null;	2✔
197	for ($i = ($stackPtr + 1); $i < $closer; $i++) {	2✔
198	if (isset($tokens[$i]['scope_closer']) === true) {	2✔
199	if ($tokens[$i]['scope_closer'] === $closer) {	2✔
200	// We found an opener that shares the same
201	// closing token as us.
202	$nextOpener = $i;	×
203	break;	×
204	}
205	}
206	}//end for
207
208	if ($nextOpener === null) {	2✔
209	$end = $closer;	2✔
210	} else {
211	$end = ($nextOpener - 1);	×
212	}
213	} else {
214	// This token is in the global scope.
215	if ($tokens[$stackPtr]['code'] === T_BREAK) {	2✔
216	return;	×
217	}
218
219	// Throw an error for all lines until the end of the file.
220	$end = ($phpcsFile->numTokens - 1);	2✔
221	}//end if
222
223	// Find the semicolon or closing PHP tag that ends this statement,
224	// skipping nested statements like FOR loops and closures.
225	for ($start = ($stackPtr + 1); $start < $phpcsFile->numTokens; $start++) {	2✔
226	if ($start === $end) {	2✔
227	break;	2✔
228	}
229
230	if (isset($tokens[$start]['parenthesis_closer']) === true	2✔
231	&& $tokens[$start]['code'] === T_OPEN_PARENTHESIS	2✔
232	) {
233	$start = $tokens[$start]['parenthesis_closer'];	2✔
234	continue;	2✔
235	}
236
237	if (isset($tokens[$start]['bracket_closer']) === true	2✔
238	&& $tokens[$start]['code'] === T_OPEN_CURLY_BRACKET	2✔
239	) {
240	$start = $tokens[$start]['bracket_closer'];	2✔
241	continue;	2✔
242	}
243
244	if ($tokens[$start]['code'] === T_SEMICOLON \|\| $tokens[$start]['code'] === T_CLOSE_TAG) {	2✔
245	break;	2✔
246	}
247	}//end for
248
249	if (isset($tokens[$start]) === false) {	2✔
250	return;	×
251	}
252
253	$lastLine = $tokens[$start]['line'];	2✔
254	for ($i = ($start + 1); $i < $end; $i++) {	2✔
255	if (isset(Tokens::EMPTY_TOKENS[$tokens[$i]['code']]) === true	2✔
256	\|\| isset(Tokens::BRACKET_TOKENS[$tokens[$i]['code']]) === true	2✔
257	\|\| $tokens[$i]['code'] === T_SEMICOLON	2✔
258	) {
259	continue;	2✔
260	}
261
262	// Skip whole functions and classes/interfaces because they are not
263	// technically executed code, but rather declarations that may be used.
264	if (isset(Tokens::OO_SCOPE_TOKENS[$tokens[$i]['code']]) === true	2✔
265	\|\| $tokens[$i]['code'] === T_FUNCTION	2✔
266	\|\| $tokens[$i]['code'] === T_CLOSURE	2✔
267	) {
268	if (isset($tokens[$i]['scope_closer']) === false) {	2✔
269	// Parse error/Live coding.
270	return;	2✔
271	}
272
273	$i = $tokens[$i]['scope_closer'];	2✔
274	continue;	2✔
275	}
276
277	// Skip HTML whitespace.
278	if ($tokens[$i]['code'] === T_INLINE_HTML && trim($tokens[$i]['content']) === '') {	2✔
279	continue;	2✔
280	}
281
282	// Skip PHP re-open tag (eg, after inline HTML).
283	if ($tokens[$i]['code'] === T_OPEN_TAG) {	2✔
284	continue;	2✔
285	}
286
287	$line = $tokens[$i]['line'];	2✔
288	if ($line > $lastLine) {	2✔
289	$type = substr($tokens[$stackPtr]['type'], 2);	2✔
290	$warning = 'Code after the %s statement on line %s cannot be executed';	2✔
291	$data = [	2✔
292	$type,	2✔
293	$tokens[$stackPtr]['line'],	2✔
294	];	2✔
295	$phpcsFile->addWarning($warning, $i, 'Unreachable', $data);	2✔
296	$lastLine = $line;	2✔
297	}
298	}//end for
299
300	}//end process()
301
302
303	}//end class

PHPCSStandards / PHP_CodeSniffer / 17174734458

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