File "AbstractFunctionRestrictionsSniff.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\Sniff;
use PHP_CodeSniffer\Util\Tokens;
/**
* Restricts usage of some functions.
*
* @package WPCS\WordPressCodingStandards
*
* @since 0.3.0
* @since 0.10.0 Class became a proper abstract class. This was already the behaviour.
* Moved the file and renamed the class from
* `\WordPressCS\WordPress\Sniffs\Functions\FunctionRestrictionsSniff` to
* `\WordPressCS\WordPress\AbstractFunctionRestrictionsSniff`.
* @since 0.11.0 Extends the WordPressCS native `Sniff` class.
*/
abstract class AbstractFunctionRestrictionsSniff extends Sniff {
/**
* Exclude groups.
*
* Example: 'switch_to_blog,user_meta'
*
* @since 0.3.0
* @since 1.0.0 This property now expects to be passed an array.
* Previously a comma-delimited string was expected.
*
* @var array
*/
public $exclude = array();
/**
* Groups of function data to check against.
* Don't use this in extended classes, override getGroups() instead.
* This is only used for Unit tests.
*
* @since 0.10.0
*
* @var array
*/
public static $unittest_groups = array();
/**
* Regex pattern with placeholder for the function names.
*
* @since 0.10.0
*
* @var string
*/
protected $regex_pattern = '`^(?:%s)$`i';
/**
* Cache for the group information.
*
* @since 0.10.0
*
* @var array
*/
protected $groups = array();
/**
* Cache for the excluded groups information.
*
* @since 0.11.0
*
* @var array
*/
protected $excluded_groups = array();
/**
* Regex containing the name of all functions handled by a sniff.
*
* Set in `register()` and used to do an initial check.
*
* @var string
*/
private $prelim_check_regex;
/**
* Groups of functions to restrict.
*
* This method should be overridden in extending classes.
*
* Example: groups => array(
* 'lambda' => array(
* 'type' => 'error' | 'warning',
* 'message' => 'Use anonymous functions instead please!',
* 'functions' => array( 'file_get_contents', 'create_function', 'mysql_*' ),
* // Only useful when using wildcards:
* 'whitelist' => array( 'mysql_to_rfc3339' => true, ),
* )
* )
*
* You can use * wildcards to target a group of functions.
* When you use * wildcards, you may inadvertently restrict too many
* functions. In that case you can add the `whitelist` key to
* whitelist individual functions to prevent false positives.
*
* @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( 'functions' ) ) {
return array();
}
return array(
\T_STRING,
);
}
/**
* Set up the regular expressions for each group.
*
* @since 0.10.0
*
* @param string $key The group array index key where the input for the regular expression can be found.
* @return bool True if the groups were setup. False if not.
*/
protected function setup_groups( $key ) {
// Prepare the function group regular expressions only once.
$this->groups = $this->getGroups();
if ( empty( $this->groups ) && empty( self::$unittest_groups ) ) {
return false;
}
// Allow for adding extra unit tests.
if ( ! empty( self::$unittest_groups ) ) {
$this->groups = array_merge( $this->groups, self::$unittest_groups );
}
$all_items = array();
foreach ( $this->groups as $groupName => $group ) {
if ( empty( $group[ $key ] ) ) {
unset( $this->groups[ $groupName ] );
} else {
$items = array_map( array( $this, 'prepare_name_for_regex' ), $group[ $key ] );
$all_items[] = $items;
$items = implode( '|', $items );
$this->groups[ $groupName ]['regex'] = sprintf( $this->regex_pattern, $items );
}
}
if ( empty( $this->groups ) ) {
return false;
}
// Create one "super-regex" to allow for initial filtering.
$all_items = \call_user_func_array( 'array_merge', $all_items );
$all_items = implode( '|', array_unique( $all_items ) );
$this->prelim_check_regex = sprintf( $this->regex_pattern, $all_items );
return true;
}
/**
* Processes this test, when one of its tokens is encountered.
*
* @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 ) {
$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;
}
// Preliminary check. If the content of the T_STRING is not one of the functions we're
// looking for, we can bow out before doing the heavy lifting of checking whether
// this is a function call.
if ( preg_match( $this->prelim_check_regex, $this->tokens[ $stackPtr ]['content'] ) !== 1 ) {
return;
}
if ( true === $this->is_targetted_token( $stackPtr ) ) {
return $this->check_for_matches( $stackPtr );
}
}
/**
* Verify is the current token is a function call.
*
* @since 0.11.0 Split out from the `process()` method.
*
* @param int $stackPtr The position of the current token in the stack.
*
* @return bool
*/
public function is_targetted_token( $stackPtr ) {
if ( \T_STRING !== $this->tokens[ $stackPtr ]['code'] ) {
return false;
}
// Exclude function definitions, class methods, and namespaced calls.
if ( $this->is_class_object_call( $stackPtr ) === true ) {
return false;
}
if ( $this->is_token_namespaced( $stackPtr ) === true ) {
return false;
}
$prev = $this->phpcsFile->findPrevious( Tokens::$emptyTokens, ( $stackPtr - 1 ), null, true );
if ( false !== $prev ) {
// Skip sniffing on function, class definitions or for function aliases in use statements.
$skipped = array(
\T_FUNCTION => \T_FUNCTION,
\T_CLASS => \T_CLASS,
\T_AS => \T_AS, // Use declaration alias.
);
if ( isset( $skipped[ $this->tokens[ $prev ]['code'] ] ) ) {
return false;
}
}
// Check if this could even be a function call.
$next = $this->phpcsFile->findNext( Tokens::$emptyTokens, ( $stackPtr + 1 ), null, true );
if ( false === $next ) {
return false;
}
// Check for `use function ... (as|;)`.
if ( ( \T_STRING === $this->tokens[ $prev ]['code'] && 'function' === $this->tokens[ $prev ]['content'] )
&& ( \T_AS === $this->tokens[ $next ]['code'] || \T_SEMICOLON === $this->tokens[ $next ]['code'] )
) {
return true;
}
// If it's not a `use` statement, there should be parenthesis.
if ( \T_OPEN_PARENTHESIS !== $this->tokens[ $next ]['code'] ) {
return false;
}
return true;
}
/**
* Verify if the current token is one of the targetted functions.
*
* @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 ) {
$token_content = strtolower( $this->tokens[ $stackPtr ]['content'] );
$skip_to = array();
foreach ( $this->groups as $groupName => $group ) {
if ( isset( $this->excluded_groups[ $groupName ] ) ) {
continue;
}
if ( isset( $group['whitelist'][ $token_content ] ) ) {
continue;
}
if ( preg_match( $group['regex'], $token_content ) === 1 ) {
$skip_to[] = $this->process_matched_token( $stackPtr, $groupName, $token_content );
}
}
if ( empty( $skip_to ) || min( $skip_to ) === 0 ) {
return;
}
return min( $skip_to );
}
/**
* Process a matched token.
*
* @since 0.11.0 Split out from the `process()` method.
*
* @param int $stackPtr The position of the current token in the stack.
* @param string $group_name The name of the group which was matched.
* @param string $matched_content The token content (function name) which was matched.
*
* @return int|void Integer stack pointer to skip forward or void to continue
* normal file processing.
*/
public function process_matched_token( $stackPtr, $group_name, $matched_content ) {
$this->addMessage(
$this->groups[ $group_name ]['message'],
$stackPtr,
( 'error' === $this->groups[ $group_name ]['type'] ),
$this->string_to_errorcode( $group_name . '_' . $matched_content ),
array( $matched_content )
);
}
/**
* Prepare the function name for use in a regular expression.
*
* The getGroups() method allows for providing function names with a wildcard * to target
* a group of functions. This prepare routine takes that into account while still safely
* escaping the function name for use in a regular expression.
*
* @since 0.10.0
*
* @param string $function Function name.
* @return string Regex escaped function name.
*/
protected function prepare_name_for_regex( $function ) {
$function = str_replace( array( '.*', '*' ), '@@', $function ); // Replace wildcards with placeholder.
$function = preg_quote( $function, '`' );
$function = str_replace( '@@', '.*', $function ); // Replace placeholder with regex wildcard.
return $function;
}
}