File "NewClosureSniff.php"
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<?php
/**
* PHPCompatibility, an external standard for PHP_CodeSniffer.
*
* @package PHPCompatibility
* @copyright 2012-2019 PHPCompatibility Contributors
* @license https://opensource.org/licenses/LGPL-3.0 LGPL3
* @link https://github.com/PHPCompatibility/PHPCompatibility
*/
namespace PHPCompatibility\Sniffs\FunctionDeclarations;
use PHPCompatibility\Sniff;
use PHP_CodeSniffer_File as File;
use PHP_CodeSniffer_Tokens as Tokens;
/**
* Detect closures and verify that the features used are supported.
*
* Version based checks:
* - Closures are available since PHP 5.3.
* - Closures can be declared as `static` since PHP 5.4.
* - Closures can use the `$this` variable within a class context since PHP 5.4.
* - Closures can use `self`/`parent`/`static` since PHP 5.4.
*
* Version independent checks:
* - Static closures don't have access to the `$this` variable.
* - Closures declared outside of a class context don't have access to the `$this`
* variable unless bound to an object.
*
* PHP version 5.3
* PHP version 5.4
*
* @link https://www.php.net/manual/en/functions.anonymous.php
* @link https://wiki.php.net/rfc/closures
* @link https://wiki.php.net/rfc/closures/object-extension
*
* @since 7.0.0
*/
class NewClosureSniff extends Sniff
{
/**
* Returns an array of tokens this test wants to listen for.
*
* @since 7.0.0
*
* @return array
*/
public function register()
{
return array(\T_CLOSURE);
}
/**
* Processes this test, when one of its tokens is encountered.
*
* @since 7.0.0
* @since 7.1.4 - Added check for closure being declared as static < 5.4.
* - Added check for use of `$this` variable in class context < 5.4.
* - Added check for use of `$this` variable in static closures (unsupported).
* - Added check for use of `$this` variable outside class context (unsupported).
* @since 8.2.0 Added check for use of `self`/`static`/`parent` < 5.4.
*
* @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 int|void Integer stack pointer to skip forward or void to continue
* normal file processing.
*/
public function process(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;
}
/**
* Check whether the closure is declared as static.
*
* @since 7.1.4
*
* @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(File $phpcsFile, $stackPtr)
{
$tokens = $phpcsFile->getTokens();
$prevToken = $phpcsFile->findPrevious(Tokens::$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.
*
* @since 7.1.4
*
* @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(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".
*
* @since 8.2.0
*
* @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(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 = $phpcsFile->findNext(Tokens::$emptyTokens, ($classRef + 1), $endToken, true);
if ($next === false || $tokens[$next]['code'] !== \T_DOUBLE_COLON) {
return false;
}
return $classRef;
}
}