class views_handler_field_taxonomy

class views_handler_field_taxonomy extends views_handler_field {
    
    /**
     * Constructor to provide additional field to add.
     *
     * This constructer assumes the term_data table. If using another
     * table, we'll need to be more specific.
     */
    function construct() {
        parent::construct();
        $this->additional_fields['vid'] = 'vid';
        $this->additional_fields['tid'] = 'tid';
    }
    function option_definition() {
        $options = parent::option_definition();
        $options['link_to_taxonomy'] = array(
            'default' => FALSE,
        );
        $options['convert_spaces'] = array(
            'default' => FALSE,
        );
        return $options;
    }
    
    /**
     * Provide link to taxonomy option
     */
    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $form['link_to_taxonomy'] = array(
            '#title' => t('Link this field to its taxonomy term page'),
            '#description' => t('This will override any other link you have set.'),
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['link_to_taxonomy']),
        );
        $form['convert_spaces'] = array(
            '#title' => t('Convert spaces in term names to hyphens'),
            '#description' => t('This allows links to work with Views taxonomy term arguments.'),
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['convert_spaces']),
        );
    }
    
    /**
     * Render whatever the data is as a link to the taxonomy.
     *
     * Data should be made XSS safe prior to calling this function.
     */
    function render_link($data, $values) {
        $tid = $this->get_value($values, 'tid');
        if (!empty($this->options['link_to_taxonomy']) && !empty($tid) && $data !== NULL && $data !== '') {
            $term = new stdClass();
            $term->tid = $tid;
            $term->vid = $this->get_value($values, 'vid');
            $this->options['alter']['make_link'] = TRUE;
            $this->options['alter']['path'] = taxonomy_term_path($term);
        }
        if (!empty($this->options['convert_spaces'])) {
            $data = str_replace(' ', '-', $data);
        }
        return $data;
    }
    function render($values) {
        $value = $this->get_value($values);
        return $this->render_link($this->sanitize_value($value), $values);
    }

}