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<?php
namespace Drupal\tamper\Plugin\Tamper;
use Drupal\Core\Form\FormStateInterface;
use Drupal\tamper\Exception\TamperException;
use Drupal\tamper\TamperableItemInterface;
use Drupal\tamper\TamperBase;
class Math extends TamperBase {
const SETTING_OPERATION = 'operation';
const SETTING_FLIP = 'flip';
const SETTING_VALUE = 'value';
public function defaultConfiguration() {
$config = parent::defaultConfiguration();
$config[self::SETTING_OPERATION] = '';
$config[self::SETTING_FLIP] = FALSE;
$config[self::SETTING_VALUE] = '';
return $config;
}
public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
$form[self::SETTING_OPERATION] = [
'#type' => 'select',
'#title' => $this
->t('Operation'),
'#required' => TRUE,
'#description' => $this
->t('The operation to apply to the imported value.'),
'#default_value' => $this
->getSetting(self::SETTING_OPERATION),
'#options' => $this
->getOptions(),
];
$form[self::SETTING_FLIP] = [
'#type' => 'checkbox',
'#title' => $this
->t('Flip'),
'#description' => $this
->t('Normally, the feed item will be processed like input-value / setting-value. This option switches the order so that it is setting-value / input-value.'),
'#default_value' => $this
->getSetting(self::SETTING_FLIP),
'#states' => [
'visible' => [
':input[name="plugin_configuration[operation]"]' => [
[
'value' => 'subtraction',
],
[
'value' => 'division',
],
],
],
],
];
$form[self::SETTING_VALUE] = [
'#type' => 'number',
'#title' => $this
->t('Value'),
'#required' => TRUE,
'#description' => $this
->t('A numerical value.'),
'#default_value' => $this
->getSetting(self::SETTING_VALUE),
];
return $form;
}
public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
parent::submitConfigurationForm($form, $form_state);
$this
->setConfiguration([
self::SETTING_OPERATION => $form_state
->getValue(self::SETTING_OPERATION),
self::SETTING_FLIP => $form_state
->getValue(self::SETTING_FLIP),
self::SETTING_VALUE => $form_state
->getValue(self::SETTING_VALUE),
]);
}
public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
if ($form_state
->getValue(self::SETTING_OPERATION) === 'division' && empty($form_state
->getValue(self::SETTING_FLIP)) && $form_state
->getValue(self::SETTING_VALUE == 0)) {
$form_state
->setErrorByName(self::SETTING_VALUE, $this
->t('Cannot divide by zero.'));
}
}
protected function getOptions() {
return [
'addition' => $this
->t('addition'),
'subtraction' => $this
->t('subtraction'),
'multiplication' => $this
->t('multiplication'),
'division' => $this
->t('division'),
];
}
public function tamper($data, TamperableItemInterface $item = NULL) {
$operation = $this
->getSetting(self::SETTING_OPERATION);
$flip = $this
->getSetting(self::SETTING_FLIP);
$value = $this
->getSetting(self::SETTING_VALUE);
if ($data === TRUE || $data === FALSE || $data === NULL) {
$data = (int) $data;
}
if (!is_numeric($data)) {
throw new TamperException('Math plugin failed because data was not numeric.');
}
if ($flip) {
switch ($operation) {
case 'subtraction':
$data = $value - $data;
break;
case 'division':
if (empty($data)) {
throw new TamperException('Math plugin failed because divide by zero was attempted.');
}
$data = $value / $data;
}
return $data;
}
switch ($operation) {
case 'addition':
$data = $data + $value;
break;
case 'subtraction':
$data = $data - $value;
break;
case 'multiplication':
$data = $data * $value;
break;
case 'division':
$data = $data / $value;
}
return $data;
}
}