Issue #3382085 by g089h515r806: Add support for Symfony LessThan Constraint

config/schema/field_validation.schema.yml

@@ -409,3 +409,17 @@ field_validation.rule.not_identical_to_constraint_rule:
     message:
       type: string
       label: 'Message'
+
+field_validation.rule.less_than_constraint_rule:
+  type: mapping
+  label: 'LessThan constraint validation rule'
+  mapping:
+    validate_mode:
+      type: string
+      label: 'Validate mode'
+    value:
+      type: string
+      label: 'Value'
+    message:
+      type: string
+      label: 'Message'
\ No newline at end of file

src/Plugin/FieldValidationRule/LessThanConstraintFieldValidationRule.php

+<?php
+
+namespace Drupal\field_validation\Plugin\FieldValidationRule;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\field_validation\ConstraintFieldValidationRuleBase;
+use Drupal\field_validation\FieldValidationRuleSetInterface;
+
+/**
+ * Provides funcationality for LessThanConstraintFieldValidationRule.
+ *
+ * @FieldValidationRule(
+ *   id = "less_than_constraint_rule",
+ *   label = @Translation("LessThan constraint"),
+ *   description = @Translation("LessThan constraint.")
+ * )
+ */
+class LessThanConstraintFieldValidationRule extends ConstraintFieldValidationRuleBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConstraintName(): string{
+    return "LessThan";
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isPropertyConstraint(): bool{
+    return TRUE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'value' => NULL,
+      'message' => NULL,
+    ] + parent::defaultConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form = parent::buildConfigurationForm($form, $form_state);
+
+    //copied from core.
+    $message = 'This value should be less than %compared_value.';
+
+    $form['value'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Value'),
+      '#default_value' => $this->configuration['value'],
+      '#required' => TRUE,
+    ];
+
+    $form['message'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Message'),
+      '#default_value' => $this->configuration['message'] ?? $message,
+      '#maxlength' => 255,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    parent::submitConfigurationForm($form, $form_state);
+
+    $this->configuration['value'] = $form_state->getValue('value');
+    $this->configuration['message'] = $form_state->getValue('message');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getReplacedConstraintOptions(array $params): array {
+    $constraintOptions = $this->getConstraintOptions();
+
+    $data = $this->getTokenData($params);
+    if (empty($data)) {
+      return $constraintOptions;
+    }
+
+    $constraintOptions['value'] = $this->tokenService->replace($constraintOptions['value'], $data);
+    return $constraintOptions;
+  }
+
+}

src/Plugin/Validation/Constraint/LessThanConstraint.php

+<?php
+
+namespace Drupal\field_validation\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraints\LessThan;
+use Symfony\Component\Validator\Constraints\LessThanValidator;
+
+/**
+ * LessThan constraint.
+ *
+ * @Constraint(
+ *   id = "LessThan",
+ *   label = @Translation("LessThan", context = "Validation"),
+ * )
+ */
+class LessThanConstraint extends LessThan {
+
+  public $message = 'This value should be less than %compared_value.';
+  /**
+   * {@inheritdoc}
+   */
+  public function validatedBy(): string {
+    return LessThanValidator::class;
+  }
+
+}