class AbstractVariableSniff

abstract class AbstractVariableSniff extends AbstractScopeSniff {
    
    /**
     * List of PHP Reserved variables.
     *
     * Used by various naming convention sniffs.
     *
     * @var array
     */
    protected $phpReservedVars = [
        '_SERVER' => true,
        '_GET' => true,
        '_POST' => true,
        '_REQUEST' => true,
        '_SESSION' => true,
        '_ENV' => true,
        '_COOKIE' => true,
        '_FILES' => true,
        'GLOBALS' => true,
        'http_response_header' => true,
        'HTTP_RAW_POST_DATA' => true,
        'php_errormsg' => true,
    ];
    
    /**
     * Constructs an AbstractVariableTest.
     */
    public function __construct() {
        $scopes = Tokens::$ooScopeTokens;
        $listen = [
            T_VARIABLE,
            T_DOUBLE_QUOTED_STRING,
            T_HEREDOC,
        ];
        parent::__construct($scopes, $listen, true);
    }
    
    //end __construct()
    
    /**
     * Processes the token in the specified PHP_CodeSniffer\Files\File.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where this
     *                                               token was found.
     * @param int                         $stackPtr  The position where the token was found.
     * @param int                         $currScope The current scope opener token.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return `$phpcsFile->numTokens` to skip
     *                  the rest of the file.
     */
    protected final function processTokenWithinScope(File $phpcsFile, $stackPtr, $currScope) {
        $tokens = $phpcsFile->getTokens();
        if ($tokens[$stackPtr]['code'] === T_DOUBLE_QUOTED_STRING || $tokens[$stackPtr]['code'] === T_HEREDOC) {
            // Check to see if this string has a variable in it.
            $pattern = '|(?<!\\\\)(?:\\\\{2})*\\${?[a-zA-Z0-9_]+}?|';
            if (preg_match($pattern, $tokens[$stackPtr]['content']) !== 0) {
                return $this->processVariableInString($phpcsFile, $stackPtr);
            }
            return;
        }
        // If this token is nested inside a function at a deeper
        // level than the current OO scope that was found, it's a normal
        // variable and not a member var.
        $conditions = array_reverse($tokens[$stackPtr]['conditions'], true);
        $inFunction = false;
        foreach ($conditions as $scope => $code) {
            if (isset(Tokens::$ooScopeTokens[$code]) === true) {
                break;
            }
            if ($code === T_FUNCTION || $code === T_CLOSURE) {
                $inFunction = true;
            }
        }
        if ($scope !== $currScope) {
            // We found a closer scope to this token, so ignore
            // this particular time through the sniff. We will process
            // this token when this closer scope is found to avoid
            // duplicate checks.
            return;
        }
        // Just make sure this isn't a variable in a function declaration.
        if ($inFunction === false && isset($tokens[$stackPtr]['nested_parenthesis']) === true) {
            foreach ($tokens[$stackPtr]['nested_parenthesis'] as $opener => $closer) {
                if (isset($tokens[$opener]['parenthesis_owner']) === false) {
                    // Check if this is a USE statement for a closure.
                    $prev = $phpcsFile->findPrevious(Tokens::$emptyTokens, $opener - 1, null, true);
                    if ($tokens[$prev]['code'] === T_USE) {
                        $inFunction = true;
                        break;
                    }
                    continue;
                }
                $owner = $tokens[$opener]['parenthesis_owner'];
                if ($tokens[$owner]['code'] === T_FUNCTION || $tokens[$owner]['code'] === T_CLOSURE) {
                    $inFunction = true;
                    break;
                }
            }
        }
        
        //end if
        if ($inFunction === true) {
            return $this->processVariable($phpcsFile, $stackPtr);
        }
        else {
            return $this->processMemberVar($phpcsFile, $stackPtr);
        }
    }
    
    //end processTokenWithinScope()
    
    /**
     * Processes the token outside the scope in the file.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where this
     *                                               token was found.
     * @param int                         $stackPtr  The position where the token was found.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return `$phpcsFile->numTokens` to skip
     *                  the rest of the file.
     */
    protected final function processTokenOutsideScope(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        // These variables are not member vars.
        if ($tokens[$stackPtr]['code'] === T_VARIABLE) {
            return $this->processVariable($phpcsFile, $stackPtr);
        }
        else {
            if ($tokens[$stackPtr]['code'] === T_DOUBLE_QUOTED_STRING || $tokens[$stackPtr]['code'] === T_HEREDOC) {
                // Check to see if this string has a variable in it.
                $pattern = '|(?<!\\\\)(?:\\\\{2})*\\${?[a-zA-Z0-9_]+}?|';
                if (preg_match($pattern, $tokens[$stackPtr]['content']) !== 0) {
                    return $this->processVariableInString($phpcsFile, $stackPtr);
                }
            }
        }
    }
    
    //end processTokenOutsideScope()
    
    /**
     * Called to process class member vars.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where this
     *                                               token was found.
     * @param int                         $stackPtr  The position where the token was found.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return `$phpcsFile->numTokens` to skip
     *                  the rest of the file.
     */
    protected abstract function processMemberVar(File $phpcsFile, $stackPtr);
    
    /**
     * Called to process normal member vars.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where this
     *                                               token was found.
     * @param int                         $stackPtr  The position where the token was found.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return `$phpcsFile->numTokens` to skip
     *                  the rest of the file.
     */
    protected abstract function processVariable(File $phpcsFile, $stackPtr);
    
    /**
     * Called to process variables found in double quoted strings or heredocs.
     *
     * Note that there may be more than one variable in the string, which will
     * result only in one call for the string or one call per line for heredocs.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where this
     *                                               token was found.
     * @param int                         $stackPtr  The position where the double quoted
     *                                               string was found.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return `$phpcsFile->numTokens` to skip
     *                  the rest of the file.
     */
    protected abstract function processVariableInString(File $phpcsFile, $stackPtr);

}