class Numeric

1. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/field/Numeric.php \Drupal\views\Plugin\views\field\Numeric
2. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/argument/Numeric.php \Drupal\views\Plugin\views\argument\Numeric
3. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/argument_validator/Numeric.php \Drupal\views\Plugin\views\argument_validator\Numeric
4. 8.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/filter/Numeric.php \Drupal\views\Plugin\views\filter\Numeric

views.argument.schema.yml in drupal/core/modules/views/config/schema/views.argument.schema.yml

drupal/core/modules/views/config/schema/views.argument.schema.yml

views.argument_validator.schema.yml in drupal/core/modules/views/config/schema/views.argument_validator.schema.yml

drupal/core/modules/views/config/schema/views.argument_validator.schema.yml

views.field.schema.yml in drupal/core/modules/views/config/schema/views.field.schema.yml

drupal/core/modules/views/config/schema/views.field.schema.yml

views.filter.schema.yml in drupal/core/modules/views/config/schema/views.filter.schema.yml

drupal/core/modules/views/config/schema/views.filter.schema.yml

class Numeric extends FilterPluginBase {
  var $always_multiple = TRUE;
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['value'] = array(
      'contains' => array(
        'min' => array(
          'default' => '',
        ),
        'max' => array(
          'default' => '',
        ),
        'value' => array(
          'default' => '',
        ),
      ),
    );
    return $options;
  }
  function operators() {
    $operators = array(
      '<' => array(
        'title' => t('Is less than'),
        'method' => 'opSimple',
        'short' => t('<'),
        'values' => 1,
      ),
      '<=' => array(
        'title' => t('Is less than or equal to'),
        'method' => 'opSimple',
        'short' => t('<='),
        'values' => 1,
      ),
      '=' => array(
        'title' => t('Is equal to'),
        'method' => 'opSimple',
        'short' => t('='),
        'values' => 1,
      ),
      '!=' => array(
        'title' => t('Is not equal to'),
        'method' => 'opSimple',
        'short' => t('!='),
        'values' => 1,
      ),
      '>=' => array(
        'title' => t('Is greater than or equal to'),
        'method' => 'opSimple',
        'short' => t('>='),
        'values' => 1,
      ),
      '>' => array(
        'title' => t('Is greater than'),
        'method' => 'opSimple',
        'short' => t('>'),
        'values' => 1,
      ),
      'between' => array(
        'title' => t('Is between'),
        'method' => 'opBetween',
        'short' => t('between'),
        'values' => 2,
      ),
      'not between' => array(
        'title' => t('Is not between'),
        'method' => 'opBetween',
        'short' => t('not between'),
        'values' => 2,
      ),
    );

    // if the definition allows for the empty operator, add it.
    if (!empty($this->definition['allow empty'])) {
      $operators += array(
        'empty' => array(
          'title' => t('Is empty (NULL)'),
          'method' => 'opEmpty',
          'short' => t('empty'),
          'values' => 0,
        ),
        'not empty' => array(
          'title' => t('Is not empty (NOT NULL)'),
          'method' => 'opEmpty',
          'short' => t('not empty'),
          'values' => 0,
        ),
      );
    }

    // Add regexp support for MySQL.
    if (Database::getConnection()
      ->databaseType() == 'mysql') {
      $operators += array(
        'regular_expression' => array(
          'title' => t('Regular expression'),
          'short' => t('regex'),
          'method' => 'opRegex',
          'values' => 1,
        ),
      );
    }
    return $operators;
  }

  /**
   * Provide a list of all the numeric operators
   */
  public function operatorOptions($which = 'title') {
    $options = array();
    foreach ($this
      ->operators() as $id => $info) {
      $options[$id] = $info[$which];
    }
    return $options;
  }
  protected function operatorValues($values = 1) {
    $options = array();
    foreach ($this
      ->operators() as $id => $info) {
      if ($info['values'] == $values) {
        $options[] = $id;
      }
    }
    return $options;
  }

  /**
   * Provide a simple textfield for equality
   */
  protected function valueForm(&$form, &$form_state) {
    $form['value']['#tree'] = TRUE;

    // We have to make some choices when creating this as an exposed
    // filter form. For example, if the operator is locked and thus
    // not rendered, we can't render dependencies; instead we only
    // render the form items we need.
    $which = 'all';
    if (!empty($form['operator'])) {
      $source = ':input[name="options[operator]"]';
    }
    if (!empty($form_state['exposed'])) {
      $identifier = $this->options['expose']['identifier'];
      if (empty($this->options['expose']['use_operator']) || empty($this->options['expose']['operator_id'])) {

        // exposed and locked.
        $which = in_array($this->operator, $this
          ->operatorValues(2)) ? 'minmax' : 'value';
      }
      else {
        $source = ':input[name="' . $this->options['expose']['operator_id'] . '"]';
      }
    }
    if ($which == 'all') {
      $form['value']['value'] = array(
        '#type' => 'textfield',
        '#title' => empty($form_state['exposed']) ? t('Value') : '',
        '#size' => 30,
        '#default_value' => $this->value['value'],
      );

      // Setup #states for all operators with one value.
      foreach ($this
        ->operatorValues(1) as $operator) {
        $form['value']['value']['#states']['visible'][] = array(
          $source => array(
            'value' => $operator,
          ),
        );
      }
      if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier]['value'])) {
        $form_state['input'][$identifier]['value'] = $this->value['value'];
      }
    }
    elseif ($which == 'value') {

      // When exposed we drop the value-value and just do value if
      // the operator is locked.
      $form['value'] = array(
        '#type' => 'textfield',
        '#title' => empty($form_state['exposed']) ? t('Value') : '',
        '#size' => 30,
        '#default_value' => $this->value['value'],
      );
      if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier])) {
        $form_state['input'][$identifier] = $this->value['value'];
      }
    }
    if ($which == 'all' || $which == 'minmax') {
      $form['value']['min'] = array(
        '#type' => 'textfield',
        '#title' => empty($form_state['exposed']) ? t('Min') : '',
        '#size' => 30,
        '#default_value' => $this->value['min'],
      );
      $form['value']['max'] = array(
        '#type' => 'textfield',
        '#title' => empty($form_state['exposed']) ? t('And max') : t('And'),
        '#size' => 30,
        '#default_value' => $this->value['max'],
      );
      if ($which == 'all') {
        $states = array();

        // Setup #states for all operators with two values.
        foreach ($this
          ->operatorValues(2) as $operator) {
          $states['#states']['visible'][] = array(
            $source => array(
              'value' => $operator,
            ),
          );
        }
        $form['value']['min'] += $states;
        $form['value']['max'] += $states;
      }
      if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier]['min'])) {
        $form_state['input'][$identifier]['min'] = $this->value['min'];
      }
      if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier]['max'])) {
        $form_state['input'][$identifier]['max'] = $this->value['max'];
      }
      if (!isset($form['value'])) {

        // Ensure there is something in the 'value'.
        $form['value'] = array(
          '#type' => 'value',
          '#value' => NULL,
        );
      }
    }
  }
  public function query() {
    $this
      ->ensureMyTable();
    $field = "{$this->tableAlias}.{$this->realField}";
    $info = $this
      ->operators();
    if (!empty($info[$this->operator]['method'])) {
      $this
        ->{$info[$this->operator]['method']}($field);
    }
  }
  protected function opBetween($field) {
    if ($this->operator == 'between') {
      $this->query
        ->addWhere($this->options['group'], $field, array(
        $this->value['min'],
        $this->value['max'],
      ), 'BETWEEN');
    }
    else {
      $this->query
        ->addWhere($this->options['group'], db_or()
        ->condition($field, $this->value['min'], '<=')
        ->condition($field, $this->value['max'], '>='));
    }
  }
  protected function opSimple($field) {
    $this->query
      ->addWhere($this->options['group'], $field, $this->value['value'], $this->operator);
  }
  protected function opEmpty($field) {
    if ($this->operator == 'empty') {
      $operator = "IS NULL";
    }
    else {
      $operator = "IS NOT NULL";
    }
    $this->query
      ->addWhere($this->options['group'], $field, NULL, $operator);
  }
  protected function opRegex($field) {
    $this->query
      ->addWhere($this->options['group'], $field, $this->value, 'RLIKE');
  }
  public function adminSummary() {
    if ($this
      ->isAGroup()) {
      return t('grouped');
    }
    if (!empty($this->options['exposed'])) {
      return t('exposed');
    }
    $options = $this
      ->operatorOptions('short');
    $output = check_plain($options[$this->operator]);
    if (in_array($this->operator, $this
      ->operatorValues(2))) {
      $output .= ' ' . t('@min and @max', array(
        '@min' => $this->value['min'],
        '@max' => $this->value['max'],
      ));
    }
    elseif (in_array($this->operator, $this
      ->operatorValues(1))) {
      $output .= ' ' . check_plain($this->value['value']);
    }
    return $output;
  }

  /**
   * Do some minor translation of the exposed input
   */
  public function acceptExposedInput($input) {
    if (empty($this->options['exposed'])) {
      return TRUE;
    }

    // rewrite the input value so that it's in the correct format so that
    // the parent gets the right data.
    if (!empty($this->options['expose']['identifier'])) {
      $value =& $input[$this->options['expose']['identifier']];
      if (!is_array($value)) {
        $value = array(
          'value' => $value,
        );
      }
    }
    $rc = parent::acceptExposedInput($input);
    if (empty($this->options['expose']['required'])) {

      // We have to do some of our own checking for non-required filters.
      $info = $this
        ->operators();
      if (!empty($info[$this->operator]['values'])) {
        switch ($info[$this->operator]['values']) {
          case 1:
            if ($value['value'] === '') {
              return FALSE;
            }
            break;
          case 2:
            if ($value['min'] === '' && $value['max'] === '') {
              return FALSE;
            }
            break;
        }
      }
    }
    return $rc;
  }

}