--- /dev/null
+<?php
+
+namespace Drupal\pathologic\Plugin\Filter;
+
+use Drupal\filter\FilterProcessResult;
+use Drupal\filter\Plugin\FilterBase;
+use Drupal\Component\Utility\Crypt;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\pathologic\PathologicSettingsCommon;
+use Drupal\Core\Url;
+
+/**
+ * Attempts to correct broken paths in content.
+ *
+ * We give the filter a weight of 50 in the annotation below because in almost
+ * all cases Pathologic should be the last filter in the filter list. Is it
+ * possible to put a comment inside an annotation? Man, annotations are such a
+ * stupid idea.
+ *
+ * @Filter(
+ * id = "filter_pathologic",
+ * title = @Translation("Correct URLs with Pathologic"),
+ * type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE,
+ * settings = {
+ * "settings_source" = "global",
+ * "local_settings" = {
+ * "protocol_style" = "full",
+ * "local_paths" = ""
+ * }
+ * },
+ * weight = 50
+ * )
+ */
+class FilterPathologic extends FilterBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function settingsForm(array $form, FormStateInterface $form_state) {
+ $form['reminder'] = [
+ '#type' => 'markup',
+ '#markup' => $this->t('In most cases, Pathologic should be the <em>last</em> filter in the “Filter processing order” list.'),
+ '#weight' => 0,
+ ];
+ $form['settings_source'] = [
+ '#type' => 'radios',
+ '#title' => $this->t('Settings source'),
+ '#description' => $this->t('Select whether Pathologic should use the <a href=":config">global Pathologic settings</a> or custom “local” settings when filtering text in this text format.', [':config' => Url::fromRoute('pathologic.config_form')->toString()]),
+ '#weight' => 10,
+ '#default_value' => $this->settings['settings_source'],
+ '#options' => [
+ 'global' => $this->t('Use global Pathologic settings'),
+ 'local' => $this->t('Use custom settings for this text format'),
+ ],
+ ];
+ // Fields in fieldsets areā¦ awkward to implement.
+ // @see https://www.drupal.org/node/2378437
+ $form['local_settings'] = [
+ '#type' => 'fieldset',
+ '#title' => $this->t('Custom settings for this text format'),
+ '#weight' => 20,
+ '#collapsible' => FALSE,
+ '#collapsed' => FALSE,
+ '#description' => $this->t('These settings are ignored if “Use global Pathologic settings” is selected above.'),
+ // @todo Fix the #states magic (or see if it's a core D8 bug)
+ '#states' => [
+ 'visible' => [
+ ':input[name="filters[filter_pathologic][settings][settings_source]"]' => ['value' => 'local'],
+ ],
+ ],
+ ];
+
+ $common = new PathologicSettingsCommon();
+ $form['local_settings'] += $common->commonSettingsForm($this->settings['local_settings']);
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function process($text, $langcode) {
+ $settings = $this->settings;
+ if ($settings['settings_source'] === 'global') {
+ $config = \Drupal::config('pathologic.settings');
+ $settings['protocol_style'] = $config->get('protocol_style');
+ $settings['local_paths'] = $config->get('local_paths');
+ }
+ else {
+ $settings = $settings['local_settings'];
+ }
+ // @todo Move code from .module file to inside here.
+ return new FilterProcessResult(_pathologic_filter($text, $settings, Crypt::hashBase64(serialize($settings))));
+ }
+
+}