Postgres::_parseACL PHP Method

    function _parseACL($acl)
    {
        // Take off the first and last characters (the braces)
        $acl = substr($acl, 1, strlen($acl) - 2);
        // Pick out individual ACE's by carefully parsing.  This is necessary in order
        // to cope with usernames and stuff that contain commas
        $aces = array();
        $i = $j = 0;
        $in_quotes = false;
        while ($i < strlen($acl)) {
            // If current char is a double quote and it's not escaped, then
            // enter quoted bit
            $char = substr($acl, $i, 1);
            if ($char == '"' && ($i == 0 || substr($acl, $i - 1, 1) != '\\')) {
                $in_quotes = !$in_quotes;
            } elseif ($char == ',' && !$in_quotes) {
                // Add text so far to the array
                $aces[] = substr($acl, $j, $i - $j);
                $j = $i + 1;
            }
            $i++;
        }
        // Add final text to the array
        $aces[] = substr($acl, $j);
        // Create the array to be returned
        $temp = array();
        // For each ACE, generate an entry in $temp
        foreach ($aces as $v) {
            // If the ACE begins with a double quote, strip them off both ends
            // and unescape backslashes and double quotes
            $unquote = false;
            if (strpos($v, '"') === 0) {
                $v = substr($v, 1, strlen($v) - 2);
                $v = str_replace('\\"', '"', $v);
                $v = str_replace('\\\\', '\\', $v);
            }
            // Figure out type of ACE (public, user or group)
            if (strpos($v, '=') === 0) {
                $atype = 'public';
            } else {
                if ($this->hasRoles()) {
                    $atype = 'role';
                } else {
                    if (strpos($v, 'group ') === 0) {
                        $atype = 'group';
                        // Tear off 'group' prefix
                        $v = substr($v, 6);
                    } else {
                        $atype = 'user';
                    }
                }
            }
            // Break on unquoted equals sign...
            $i = 0;
            $in_quotes = false;
            $entity = null;
            $chars = null;
            while ($i < strlen($v)) {
                // If current char is a double quote and it's not escaped, then
                // enter quoted bit
                $char = substr($v, $i, 1);
                $next_char = substr($v, $i + 1, 1);
                if ($char == '"' && ($i == 0 || $next_char != '"')) {
                    $in_quotes = !$in_quotes;
                } elseif ($char == '"' && $next_char == '"') {
                    $i++;
                } elseif ($char == '=' && !$in_quotes) {
                    // Split on current equals sign
                    $entity = substr($v, 0, $i);
                    $chars = substr($v, $i + 1);
                    break;
                }
                $i++;
            }
            // Check for quoting on entity name, and unescape if necessary
            if (strpos($entity, '"') === 0) {
                $entity = substr($entity, 1, strlen($entity) - 2);
                $entity = str_replace('""', '"', $entity);
            }
            // New row to be added to $temp
            // (type, grantee, privileges, grantor, grant option?
            $row = array($atype, $entity, array(), '', array());
            // Loop over chars and add privs to $row
            for ($i = 0; $i < strlen($chars); $i++) {
                // Append to row's privs list the string representing
                // the privilege
                $char = substr($chars, $i, 1);
                if ($char == '*') {
                    $row[4][] = $this->privmap[substr($chars, $i - 1, 1)];
                } elseif ($char == '/') {
                    $grantor = substr($chars, $i + 1);
                    // Check for quoting
                    if (strpos($grantor, '"') === 0) {
                        $grantor = substr($grantor, 1, strlen($grantor) - 2);
                        $grantor = str_replace('""', '"', $grantor);
                    }
                    $row[3] = $grantor;
                    break;
                } else {
                    if (!isset($this->privmap[$char])) {
                        return -3;
                    } else {
                        $row[2][] = $this->privmap[$char];
                    }
                }
            }
            // Append row to temp
            $temp[] = $row;
        }
        return $temp;
    }