class views_handler_filter_combine

class views_handler_filter_combine extends views_handler_filter_string {
    
    /**
     * @var views_plugin_query_default
     */
    public $query;
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        $options['fields'] = array(
            'default' => array(),
        );
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $this->view
            ->init_style();
        // Allow to choose all fields as possible.
        if ($this->view->style_plugin
            ->uses_fields()) {
            $options = array();
            foreach ($this->view->display_handler
                ->get_handlers('field') as $name => $field) {
                $options[$name] = $field->ui_name(TRUE);
            }
            if ($options) {
                $form['fields'] = array(
                    '#type' => 'select',
                    '#title' => t('Choose fields to combine for filtering'),
                    '#description' => t("This filter doesn't work for very special field handlers."),
                    '#multiple' => TRUE,
                    '#options' => $options,
                    '#default_value' => $this->options['fields'],
                );
            }
            else {
                form_set_error('', t('You have to add some fields to be able to use this filter.'));
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $this->view
            ->_build('field');
        $fields = array();
        // Only add the fields if they have a proper field and table alias.
        foreach ($this->options['fields'] as $id) {
            // Field access checks may have removed this handler.
            if (!isset($this->view->field[$id])) {
                continue;
            }
            $field = $this->view->field[$id];
            // Always add the table of the selected fields to be sure a table alias
            // exists.
            $field->ensure_my_table();
            if (!empty($field->table_alias) && !empty($field->real_field)) {
                $fields[] = "{$field->table_alias}.{$field->real_field}";
            }
        }
        if ($fields) {
            $count = count($fields);
            $separated_fields = array();
            foreach ($fields as $key => $field) {
                $separated_fields[] = $field;
                if ($key < $count - 1) {
                    $separated_fields[] = "' '";
                }
            }
            $expression = implode(', ', $separated_fields);
            $expression = "CONCAT_WS(' ', {$expression})";
            $info = $this->operators();
            if (!empty($info[$this->operator]['method'])) {
                $this->{$info[$this->operator]['method']}($expression);
            }
        }
    }
    
    /**
     * By default things like op_equal uses add_where, that doesn't support
     * complex expressions, so override all operators.
     */
    public function op_equal($field) {
        $placeholder = $this->placeholder();
        $operator = $this->operator();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} {$operator} {$placeholder}", array(
            $placeholder => $this->value,
        ));
    }
    
    /**
     *
     */
    public function op_contains($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} LIKE {$placeholder}", array(
            $placeholder => '%' . db_like($this->value) . '%',
        ));
    }
    
    /**
     *
     */
    public function op_word($field) {
        $where = $this->operator == 'word' ? db_or() : db_and();
        // Don't filter on empty strings.
        if (empty($this->value)) {
            return;
        }
        preg_match_all('/ (-?)("[^"]+"|[^" ]+)/i', ' ' . $this->value, $matches, PREG_SET_ORDER);
        foreach ($matches as $match) {
            $phrase = FALSE;
            // Strip off phrase quotes.
            if ($match[2][0] == '"') {
                $match[2] = substr($match[2], 1, -1);
                $phrase = TRUE;
            }
            $words = trim($match[2], ',?!();:-');
            $words = $phrase ? array(
                $words,
            ) : preg_split('/ /', $words, -1, PREG_SPLIT_NO_EMPTY);
            $placeholder = $this->placeholder();
            foreach ($words as $word) {
                $where->where($field . " LIKE {$placeholder}", array(
                    $placeholder => '%' . db_like(trim($word, " ,!?")) . '%',
                ));
            }
        }
        if (!$where) {
            return;
        }
        // Previously this was a call_user_func_array() but that's unnecessary
        // as views will unpack an array that is a single arg.
        $this->query
            ->add_where($this->options['group'], $where);
    }
    
    /**
     *
     */
    public function op_starts($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} LIKE {$placeholder}", array(
            $placeholder => db_like($this->value) . '%',
        ));
    }
    
    /**
     *
     */
    public function op_not_starts($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} NOT LIKE {$placeholder}", array(
            $placeholder => db_like($this->value) . '%',
        ));
    }
    
    /**
     *
     */
    public function op_ends($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} LIKE {$placeholder}", array(
            $placeholder => '%' . db_like($this->value),
        ));
    }
    
    /**
     *
     */
    public function op_not_ends($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} NOT LIKE {$placeholder}", array(
            $placeholder => '%' . db_like($this->value),
        ));
    }
    
    /**
     *
     */
    public function op_not($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} NOT LIKE {$placeholder}", array(
            $placeholder => '%' . db_like($this->value) . '%',
        ));
    }
    
    /**
     *
     */
    public function op_regex($field) {
        if (empty($this->value)) {
            return;
        }
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} RLIKE {$placeholder}", array(
            $placeholder => $this->value,
        ));
    }
    
    /**
     *
     */
    public function op_not_regex($field) {
        $placeholder = $this->placeholder();
        $this->query
            ->add_where_expression($this->options['group'], "{$field} NOT RLIKE {$placeholder}", array(
            $placeholder => $this->value,
        ));
    }
    
    /**
     *
     */
    public function op_empty($field) {
        if ($this->operator == 'empty') {
            $operator = "IS NULL";
        }
        else {
            $operator = "IS NOT NULL";
        }
        $this->query
            ->add_where_expression($this->options['group'], "{$field} {$operator}");
    }

}