File "ValidIntegersSniff.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\Miscellaneous;
use PHPCompatibility\Sniff;
use PHP_CodeSniffer_File as File;
/**
* Check for valid integer types and values.
*
* Checks:
* - PHP 5.4 introduced binary integers.
* - PHP 7.0 removed tolerance for invalid octals. These were truncated prior to PHP 7
* and give a parse error since PHP 7.
* - PHP 7.0 removed support for recognizing hexadecimal numeric strings as numeric.
* Type juggling and recognition was inconsistent prior to PHP 7. As of PHP 7, they
* are no longer treated as numeric.
*
* PHP version 5.4+
*
* @link https://wiki.php.net/rfc/binnotation4ints
* @link https://wiki.php.net/rfc/remove_hex_support_in_numeric_strings
* @link https://www.php.net/manual/en/language.types.integer.php
*
* @since 7.0.3
* @since 7.0.8 This sniff now throws a warning instead of an error for invalid binary integers.
*/
class ValidIntegersSniff extends Sniff
{
/**
* Whether PHPCS is run on a PHP < 5.4.
*
* @since 7.0.3
*
* @var bool
*/
protected $isLowPHPVersion = false;
/**
* Returns an array of tokens this test wants to listen for.
*
* @since 7.0.3
*
* @return array
*/
public function register()
{
$this->isLowPHPVersion = version_compare(\PHP_VERSION_ID, '50400', '<');
return array(
\T_LNUMBER, // Binary, octal integers.
\T_CONSTANT_ENCAPSED_STRING, // Hex numeric string.
);
}
/**
* Processes this test, when one of its tokens is encountered.
*
* @since 7.0.3
*
* @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
* @param int $stackPtr The position of the current token in
* the stack.
*
* @return void
*/
public function process(File $phpcsFile, $stackPtr)
{
$tokens = $phpcsFile->getTokens();
$token = $tokens[$stackPtr];
if ($this->couldBeBinaryInteger($tokens, $stackPtr) === true) {
if ($this->supportsBelow('5.3')) {
$error = 'Binary integer literals were not present in PHP version 5.3 or earlier. Found: %s';
if ($this->isLowPHPVersion === false) {
$data = array($token['content']);
} else {
$data = array($this->getBinaryInteger($phpcsFile, $tokens, $stackPtr));
}
$phpcsFile->addError($error, $stackPtr, 'BinaryIntegerFound', $data);
}
if ($this->isInvalidBinaryInteger($tokens, $stackPtr) === true) {
$error = 'Invalid binary integer detected. Found: %s';
$data = array($this->getBinaryInteger($phpcsFile, $tokens, $stackPtr));
$phpcsFile->addWarning($error, $stackPtr, 'InvalidBinaryIntegerFound', $data);
}
return;
}
$isError = $this->supportsAbove('7.0');
$data = array( $token['content'] );
if ($this->isInvalidOctalInteger($tokens, $stackPtr) === true) {
$this->addMessage(
$phpcsFile,
'Invalid octal integer detected. Prior to PHP 7 this would lead to a truncated number. From PHP 7 onwards this causes a parse error. Found: %s',
$stackPtr,
$isError,
'InvalidOctalIntegerFound',
$data
);
return;
}
if ($this->isHexidecimalNumericString($tokens, $stackPtr) === true) {
$this->addMessage(
$phpcsFile,
'The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: %s',
$stackPtr,
$isError,
'HexNumericStringFound',
$data
);
return;
}
}
/**
* Could the current token potentially be a binary integer ?
*
* @since 7.0.3
*
* @param array $tokens Token stack.
* @param int $stackPtr The current position in the token stack.
*
* @return bool
*/
private function couldBeBinaryInteger($tokens, $stackPtr)
{
$token = $tokens[$stackPtr];
if ($token['code'] !== \T_LNUMBER) {
return false;
}
if ($this->isLowPHPVersion === false) {
return (preg_match('`^0b[0-1]+$`iD', $token['content']) === 1);
}
// Pre-5.4, binary strings are tokenized as T_LNUMBER (0) + T_STRING ("b01010101").
// At this point, we don't yet care whether it's a valid binary int, that's a separate check.
else {
return($token['content'] === '0' && $tokens[$stackPtr + 1]['code'] === \T_STRING && preg_match('`^b[0-9]+$`iD', $tokens[$stackPtr + 1]['content']) === 1);
}
}
/**
* Is the current token an invalid binary integer ?
*
* @since 7.0.3
*
* @param array $tokens Token stack.
* @param int $stackPtr The current position in the token stack.
*
* @return bool
*/
private function isInvalidBinaryInteger($tokens, $stackPtr)
{
if ($this->couldBeBinaryInteger($tokens, $stackPtr) === false) {
return false;
}
if ($this->isLowPHPVersion === false) {
// If it's an invalid binary int, the token will be split into two T_LNUMBER tokens.
return ($tokens[$stackPtr + 1]['code'] === \T_LNUMBER);
} else {
return (preg_match('`^b[0-1]+$`iD', $tokens[$stackPtr + 1]['content']) === 0);
}
}
/**
* Retrieve the content of the tokens which together look like a binary integer.
*
* @since 7.0.3
*
* @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
* @param array $tokens Token stack.
* @param int $stackPtr The position of the current token in
* the stack.
*
* @return string
*/
private function getBinaryInteger(File $phpcsFile, $tokens, $stackPtr)
{
$length = 2; // PHP < 5.4 T_LNUMBER + T_STRING.
if ($this->isLowPHPVersion === false) {
$i = $stackPtr;
while ($tokens[$i]['code'] === \T_LNUMBER) {
$i++;
}
$length = ($i - $stackPtr);
}
return $phpcsFile->getTokensAsString($stackPtr, $length);
}
/**
* Is the current token an invalid octal integer ?
*
* @since 7.0.3
*
* @param array $tokens Token stack.
* @param int $stackPtr The current position in the token stack.
*
* @return bool
*/
private function isInvalidOctalInteger($tokens, $stackPtr)
{
$token = $tokens[$stackPtr];
if ($token['code'] === \T_LNUMBER && preg_match('`^0[0-7]*[8-9]+[0-9]*$`D', $token['content']) === 1) {
return true;
}
return false;
}
/**
* Is the current token a hexidecimal numeric string ?
*
* @since 7.0.3
*
* @param array $tokens Token stack.
* @param int $stackPtr The current position in the token stack.
*
* @return bool
*/
private function isHexidecimalNumericString($tokens, $stackPtr)
{
$token = $tokens[$stackPtr];
if ($token['code'] === \T_CONSTANT_ENCAPSED_STRING && preg_match('`^0x[a-f0-9]+$`iD', $this->stripQuotes($token['content'])) === 1) {
return true;
}
return false;
}
}