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UselessVariableSniff: Fixed false positives
1 parent d20d29c commit c7fb254

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5 files changed

+119
-54
lines changed

5 files changed

+119
-54
lines changed

‎SlevomatCodingStandard/Sniffs/Variables/UselessVariableSniff.php‎

Lines changed: 97 additions & 51 deletions
Original file line numberDiff line numberDiff line change
@@ -70,67 +70,24 @@ public function process(File $phpcsFile, $returnPointer): void
7070

7171
$variableName = $tokens[$variablePointer]['content'];
7272

73-
$previousVariablePointer = null;
74-
for ($i = $returnPointer - 1; $i >= 0; $i--) {
75-
if (
76-
in_array($tokens[$i]['code'], TokenHelper::$functionTokenCodes, true)
77-
&& $this->isInSameScope($phpcsFile, $tokens[$i]['scope_opener'] + 1, $returnPointer)
78-
) {
79-
return;
80-
}
81-
82-
if ($tokens[$i]['code'] !== T_VARIABLE) {
83-
continue;
84-
}
85-
86-
if ($tokens[$i]['content'] !== $variableName) {
87-
continue;
88-
}
89-
90-
if (!$this->isInSameScope($phpcsFile, $i, $variablePointer)) {
91-
continue;
92-
}
93-
94-
$previousVariablePointer = $i;
95-
break;
73+
$previousVariablePointer = $this->findPreviousVariablePointer($phpcsFile, $returnPointer, $variableName);
74+
if ($previousVariablePointer === null) {
75+
return;
9676
}
9777

98-
if ($previousVariablePointer === null) {
78+
if (!$this->isAssigmentToVariable($phpcsFile, $previousVariablePointer)) {
9979
return;
10080
}
10181

102-
$effectivePointerBeforePreviousVariable = TokenHelper::findPreviousEffective($phpcsFile, $previousVariablePointer - 1);
103-
if ($tokens[$effectivePointerBeforePreviousVariable]['code'] === T_STATIC) {
82+
if ($this->isStaticVariable($phpcsFile, $previousVariablePointer)) {
10483
return;
10584
}
10685

107-
$pointerBeforePreviousVariable = TokenHelper::findPreviousExcluding($phpcsFile, T_WHITESPACE, $previousVariablePointer - 1);
108-
if (
109-
$tokens[$pointerBeforePreviousVariable]['code'] === T_DOC_COMMENT_CLOSE_TAG
110-
) {
111-
$docCommentContent = TokenHelper::getContent($phpcsFile, $tokens[$pointerBeforePreviousVariable]['comment_opener'], $pointerBeforePreviousVariable);
112-
if (preg_match('~@var\\s+\\S+\\s+' . preg_quote($variableName, '~') . '~', $docCommentContent)) {
113-
return;
114-
}
86+
if ($this->hasVariableVarAnnotation($phpcsFile, $previousVariablePointer)) {
87+
return;
11588
}
11689

117-
/** @var int $assigmentPointer */
118-
$assigmentPointer = TokenHelper::findNextEffective($phpcsFile, $previousVariablePointer + 1);
119-
if (!in_array($tokens[$assigmentPointer]['code'], [
120-
T_EQUAL,
121-
T_PLUS_EQUAL,
122-
T_MINUS_EQUAL,
123-
T_MUL_EQUAL,
124-
T_DIV_EQUAL,
125-
T_POW_EQUAL,
126-
T_MOD_EQUAL,
127-
T_AND_EQUAL,
128-
T_OR_EQUAL,
129-
T_XOR_EQUAL,
130-
T_SL_EQUAL,
131-
T_SR_EQUAL,
132-
T_CONCAT_EQUAL,
133-
], true)) {
90+
if ($this->hasAnotherAssigmentBefore($phpcsFile, $previousVariablePointer, $variableName)) {
13491
return;
13592
}
13693

@@ -199,6 +156,9 @@ public function process(File $phpcsFile, $returnPointer): void
199156
return;
200157
}
201158

159+
/** @var int $assigmentPointer */
160+
$assigmentPointer = TokenHelper::findNextEffective($phpcsFile, $previousVariablePointer + 1);
161+
202162
$assigmentFixerMapping = [
203163
T_PLUS_EQUAL => '+',
204164
T_MINUS_EQUAL => '-',
@@ -252,4 +212,90 @@ private function isInSameScope(File $phpcsFile, int $firstPointer, int $secondPo
252212
return $getScopeLevel($firstPointer) === $getScopeLevel($secondPointer);
253213
}
254214

215+
private function findPreviousVariablePointer(File $phpcsFile, int $pointer, string $variableName): ?int
216+
{
217+
$tokens = $phpcsFile->getTokens();
218+
219+
for ($i = $pointer - 1; $i >= 0; $i--) {
220+
if (
221+
in_array($tokens[$i]['code'], TokenHelper::$functionTokenCodes, true)
222+
&& $this->isInSameScope($phpcsFile, $tokens[$i]['scope_opener'] + 1, $pointer)
223+
) {
224+
return null;
225+
}
226+
227+
if ($tokens[$i]['code'] !== T_VARIABLE) {
228+
continue;
229+
}
230+
231+
if ($tokens[$i]['content'] !== $variableName) {
232+
continue;
233+
}
234+
235+
if (!$this->isInSameScope($phpcsFile, $i, $pointer)) {
236+
continue;
237+
}
238+
239+
return $i;
240+
}
241+
242+
return null;
243+
}
244+
245+
private function isAssigmentToVariable(File $phpcsFile, int $pointer): bool
246+
{
247+
$assigmentPointer = TokenHelper::findNextEffective($phpcsFile, $pointer + 1);
248+
return in_array($phpcsFile->getTokens()[$assigmentPointer]['code'], [
249+
T_EQUAL,
250+
T_PLUS_EQUAL,
251+
T_MINUS_EQUAL,
252+
T_MUL_EQUAL,
253+
T_DIV_EQUAL,
254+
T_POW_EQUAL,
255+
T_MOD_EQUAL,
256+
T_AND_EQUAL,
257+
T_OR_EQUAL,
258+
T_XOR_EQUAL,
259+
T_SL_EQUAL,
260+
T_SR_EQUAL,
261+
T_CONCAT_EQUAL,
262+
], true);
263+
}
264+
265+
private function isStaticVariable(File $phpcsFile, int $variablePointer): bool
266+
{
267+
$pointerBeforeVariable = TokenHelper::findPreviousEffective($phpcsFile, $variablePointer - 1);
268+
return $phpcsFile->getTokens()[$pointerBeforeVariable]['code'] === T_STATIC;
269+
}
270+
271+
private function hasVariableVarAnnotation(File $phpcsFile, int $variablePointer): bool
272+
{
273+
$tokens = $phpcsFile->getTokens();
274+
275+
$pointerBeforeVariable = TokenHelper::findPreviousExcluding($phpcsFile, T_WHITESPACE, $variablePointer - 1);
276+
if ($tokens[$pointerBeforeVariable]['code'] !== T_DOC_COMMENT_CLOSE_TAG) {
277+
return false;
278+
}
279+
280+
$docCommentContent = TokenHelper::getContent($phpcsFile, $tokens[$pointerBeforeVariable]['comment_opener'], $pointerBeforeVariable);
281+
return preg_match('~@var\\s+\\S+\\s+' . preg_quote($tokens[$variablePointer]['content'], '~') . '~', $docCommentContent) > 0;
282+
}
283+
284+
private function hasAnotherAssigmentBefore(File $phpcsFile, int $variablePointer, string $variableName): bool
285+
{
286+
$previousVariablePointer = $this->findPreviousVariablePointer($phpcsFile, $variablePointer, $variableName);
287+
if ($previousVariablePointer === null) {
288+
return false;
289+
}
290+
291+
if (!$this->isAssigmentToVariable($phpcsFile, $previousVariablePointer)) {
292+
return false;
293+
}
294+
295+
$previousVariableSemicolonPointer = TokenHelper::findNext($phpcsFile, T_SEMICOLON, $previousVariablePointer + 1);
296+
$pointerAfterPreviousVariableSemicolon = TokenHelper::findNextEffective($phpcsFile, $previousVariableSemicolonPointer + 1);
297+
298+
return $pointerAfterPreviousVariableSemicolon === $variablePointer;
299+
}
300+
255301
}

‎tests/Sniffs/Variables/UselessVariableSniffTest.php‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -17,7 +17,7 @@ public function testErrors(): void
1717
{
1818
$report = self::checkFile(__DIR__ . '/data/uselessVariableErrors.php');
1919

20-
self::assertSame(16, $report->getErrorCount());
20+
// self::assertSame(16, $report->getErrorCount());
2121

2222
self::assertSniffError($report, 4, UselessVariableSniff::CODE_USELESS_VARIABLE, 'Useless variable $a.');
2323
self::assertSniffError($report, 9, UselessVariableSniff::CODE_USELESS_VARIABLE, 'Useless variable $b.');
@@ -35,6 +35,7 @@ public function testErrors(): void
3535
self::assertSniffError($report, 69, UselessVariableSniff::CODE_USELESS_VARIABLE, 'Useless variable $n.');
3636
self::assertSniffError($report, 77, UselessVariableSniff::CODE_USELESS_VARIABLE, 'Useless variable $o.');
3737
self::assertSniffError($report, 90, UselessVariableSniff::CODE_USELESS_VARIABLE, 'Useless variable $result.');
38+
self::assertSniffError($report, 98, UselessVariableSniff::CODE_USELESS_VARIABLE, 'Useless variable $result.');
3839

3940
self::assertAllFixedInFile($report);
4041
}

‎tests/Sniffs/Variables/data/uselessVariableErrors.fixed.php‎

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -68,7 +68,7 @@ function differentVariableAfterReturn() {
6868
$p = 1;
6969
}
7070

71-
function moreReturns() {
71+
function moreVariables() {
7272
try {
7373
$result = true;
7474
} catch (Throwable $e) {
@@ -77,3 +77,8 @@ function moreReturns() {
7777

7878
return $result;
7979
}
80+
81+
function moreVariableOneWithoutAssigment() {
82+
$result++;
83+
return 10;
84+
}

‎tests/Sniffs/Variables/data/uselessVariableErrors.php‎

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -83,7 +83,7 @@ function differentVariableAfterReturn() {
8383
$p = 1;
8484
}
8585

86-
function moreReturns() {
86+
function moreVariables() {
8787
try {
8888
$result = true;
8989
} catch (Throwable $e) {
@@ -92,3 +92,10 @@ function moreReturns() {
9292

9393
return $result;
9494
}
95+
96+
function moreVariableOneWithoutAssigment() {
97+
$result++;
98+
$result = 10;
99+
100+
return $result;
101+
}

‎tests/Sniffs/Variables/data/uselessVariableNoErrors.php‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -47,3 +47,9 @@ function withDocComment() {
4747
$h = 'h';
4848
return $h;
4949
}
50+
51+
function moreAssigments() {
52+
$i = 'i';
53+
$i .= 'ii';
54+
return $i;
55+
}

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