File "AbstractClassRestrictionsSniff.php"
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<?php
/**
* WordPress Coding Standard.
*
* @package WPCS\WordPressCodingStandards
* @link https://github.com/WordPress/WordPress-Coding-Standards
* @license https://opensource.org/licenses/MIT MIT
*/
namespace WordPressCS\WordPress;
use WordPressCS\WordPress\AbstractFunctionRestrictionsSniff;
/**
* Restricts usage of some classes.
*
* @package WPCS\WordPressCodingStandards
*
* @since 0.10.0
*/
abstract class AbstractClassRestrictionsSniff extends AbstractFunctionRestrictionsSniff {
/**
* Regex pattern with placeholder for the class names.
*
* @var string
*/
protected $regex_pattern = '`^\\\\(?:%s)$`i';
/**
* Temporary storage for retrieved class name.
*
* @var string
*/
protected $classname;
/**
* Groups of classes to restrict.
*
* This method should be overridden in extending classes.
*
* Example: groups => array(
* 'lambda' => array(
* 'type' => 'error' | 'warning',
* 'message' => 'Avoid direct calls to the database.',
* 'classes' => array( 'PDO', '\Namespace\Classname' ),
* )
* )
*
* You can use * wildcards to target a group of (namespaced) classes.
* Aliased namespaces (use ..) are currently not supported.
*
* Documented here for clarity. Not (re)defined as it is already defined in the parent class.
*
* @return array
*
abstract public function getGroups();
*/
/**
* Returns an array of tokens this test wants to listen for.
*
* @return array
*/
public function register() {
// Prepare the function group regular expressions only once.
if ( false === $this->setup_groups( 'classes' ) ) {
return array();
}
return array(
\T_DOUBLE_COLON,
\T_NEW,
\T_EXTENDS,
\T_IMPLEMENTS,
);
}
/**
* Processes this test, when one of its tokens is encountered.
*
* {@internal Unlike in the `AbstractFunctionRestrictionsSniff`,
* we can't do a preliminary check on classes as at this point
* we don't know the class name yet.}}
*
* @param int $stackPtr The position of the current token in the stack.
*
* @return int|void Integer stack pointer to skip forward or void to continue
* normal file processing.
*/
public function process_token( $stackPtr ) {
// Reset the temporary storage before processing the token.
unset( $this->classname );
$this->excluded_groups = $this->merge_custom_array( $this->exclude );
if ( array_diff_key( $this->groups, $this->excluded_groups ) === array() ) {
// All groups have been excluded.
// Don't remove the listener as the exclude property can be changed inline.
return;
}
if ( true === $this->is_targetted_token( $stackPtr ) ) {
return $this->check_for_matches( $stackPtr );
}
}
/**
* Determine if we have a valid classname for the target token.
*
* @since 0.11.0 This logic was originally contained in the `process()` method.
*
* @param int $stackPtr The position of the current token in the stack.
*
* @return bool
*/
public function is_targetted_token( $stackPtr ) {
$token = $this->tokens[ $stackPtr ];
$classname = '';
if ( \in_array( $token['code'], array( \T_NEW, \T_EXTENDS, \T_IMPLEMENTS ), true ) ) {
if ( \T_NEW === $token['code'] ) {
$nameEnd = ( $this->phpcsFile->findNext( array( \T_OPEN_PARENTHESIS, \T_WHITESPACE, \T_SEMICOLON, \T_OBJECT_OPERATOR ), ( $stackPtr + 2 ) ) - 1 );
} else {
$nameEnd = ( $this->phpcsFile->findNext( array( \T_CLOSE_CURLY_BRACKET, \T_WHITESPACE ), ( $stackPtr + 2 ) ) - 1 );
}
$length = ( $nameEnd - ( $stackPtr + 1 ) );
$classname = $this->phpcsFile->getTokensAsString( ( $stackPtr + 2 ), $length );
if ( \T_NS_SEPARATOR !== $this->tokens[ ( $stackPtr + 2 ) ]['code'] ) {
$classname = $this->get_namespaced_classname( $classname, ( $stackPtr - 1 ) );
}
}
if ( \T_DOUBLE_COLON === $token['code'] ) {
$nameEnd = $this->phpcsFile->findPrevious( \T_STRING, ( $stackPtr - 1 ) );
$nameStart = ( $this->phpcsFile->findPrevious( array( \T_STRING, \T_NS_SEPARATOR, \T_NAMESPACE ), ( $nameEnd - 1 ), null, true, null, true ) + 1 );
$length = ( $nameEnd - ( $nameStart - 1 ) );
$classname = $this->phpcsFile->getTokensAsString( $nameStart, $length );
if ( \T_NS_SEPARATOR !== $this->tokens[ $nameStart ]['code'] ) {
$classname = $this->get_namespaced_classname( $classname, ( $nameStart - 1 ) );
}
}
// Stop if we couldn't determine a classname.
if ( empty( $classname ) ) {
return false;
}
// Nothing to do if 'parent', 'self' or 'static'.
if ( \in_array( $classname, array( 'parent', 'self', 'static' ), true ) ) {
return false;
}
$this->classname = $classname;
return true;
}
/**
* Verify if the current token is one of the targetted classes.
*
* @since 0.11.0 Split out from the `process()` method.
*
* @param int $stackPtr The position of the current token in the stack.
*
* @return int|void Integer stack pointer to skip forward or void to continue
* normal file processing.
*/
public function check_for_matches( $stackPtr ) {
$skip_to = array();
foreach ( $this->groups as $groupName => $group ) {
if ( isset( $this->excluded_groups[ $groupName ] ) ) {
continue;
}
if ( preg_match( $group['regex'], $this->classname ) === 1 ) {
$skip_to[] = $this->process_matched_token( $stackPtr, $groupName, $this->classname );
}
}
if ( empty( $skip_to ) || min( $skip_to ) === 0 ) {
return;
}
return min( $skip_to );
}
/**
* Prepare the class name for use in a regular expression.
*
* The getGroups() method allows for providing class names with a wildcard * to target
* a group of classes within a namespace. It also allows for providing class names as
* 'ordinary' names or prefixed with one or more namespaces.
* This prepare routine takes that into account while still safely escaping the
* class name for use in a regular expression.
*
* @param string $classname Class name, potentially prefixed with namespaces.
* @return string Regex escaped class name.
*/
protected function prepare_name_for_regex( $classname ) {
$classname = trim( $classname, '\\' ); // Make sure all classnames have a \ prefix, but only one.
return parent::prepare_name_for_regex( $classname );
}
/**
* See if the classname was found in a namespaced file and if so, add the namespace to the classname.
*
* @param string $classname The full classname as found.
* @param int $search_from The token position to search up from.
* @return string Classname, potentially prefixed with the namespace.
*/
protected function get_namespaced_classname( $classname, $search_from ) {
// Don't do anything if this is already a fully qualified classname.
if ( empty( $classname ) || '\\' === $classname[0] ) {
return $classname;
}
// Remove the namespace keyword if used.
if ( 0 === strpos( $classname, 'namespace\\' ) ) {
$classname = substr( $classname, 10 );
}
$namespace_keyword = $this->phpcsFile->findPrevious( \T_NAMESPACE, $search_from );
if ( false === $namespace_keyword ) {
// No namespace keyword found at all, so global namespace.
$classname = '\\' . $classname;
} else {
$namespace = $this->determine_namespace( $search_from );
if ( ! empty( $namespace ) ) {
$classname = '\\' . $namespace . '\\' . $classname;
} else {
// No actual namespace found, so global namespace.
$classname = '\\' . $classname;
}
}
return $classname;
}
}