Start field processor abstraction

src/base/AbstractFieldProcessor.php

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+<?php
+
+namespace venveo\bulkedit\base;
+
+use craft\base\Element;
+use craft\base\Field;
+use craft\base\FieldInterface;
+
+abstract class AbstractFieldProcessor implements FieldProcessorInterface
+{
+    public static function performMerge(Element $element, Field $field, $value): void
+    {
+
+    }
+
+    public static function performReplacement(Element $element, Field $field, $value): void
+    {
+
+    }
+
+    public static function performSubtraction(Element $element, Field $field, $value): void
+    {
+
+    }
+
+    /**
+     * @param FieldInterface $field
+     * @return bool
+     */
+    public static function supportsField(FieldInterface $field): bool
+    {
+        foreach (self::getSupportedFields() as $fieldType) {
+            if ($field instanceof $fieldType) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

src/base/FieldProcessorInterface.php

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+<?php
+
+namespace venveo\bulkedit\base;
+
+use craft\base\Element;
+use craft\base\Field;
+
+interface FieldProcessorInterface
+{
+    /**
+     * An array of class names for supported fields
+     * @return array
+     */
+    public static function getSupportedFields(): array;
+
+    /**
+     * Returns the supported strategies for this field type
+     * @return array
+     */
+    public static function getSupportedStrategies(): array;
+
+    public static function performReplacement(Element $element, Field $field, $value): void;
+    public static function performSubtraction(Element $element, Field $field, $value): void;
+    public static function performMerge(Element $element, Field $field, $value): void;
+}

src/fields/processors/PlainTextProcessor.php

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+<?php
+
+namespace venveo\bulkedit\fields\processors;
+
+use craft\base\Element;
+use craft\base\Field;
+use craft\fields\Checkboxes;
+use craft\fields\Color;
+use craft\fields\Date;
+use craft\fields\Dropdown;
+use craft\fields\Email;
+use craft\fields\Lightswitch;
+use craft\fields\MultiSelect;
+use craft\fields\Number;
+use craft\fields\PlainText;
+use craft\fields\RadioButtons;
+use craft\fields\Table;
+use craft\redactor\Field as RedactorField;
+use craft\fields\Url;
+use venveo\bulkedit\base\AbstractFieldProcessor;
+use venveo\bulkedit\services\BulkEdit;
+
+class PlainTextProcessor extends AbstractFieldProcessor
+{
+
+    /**
+     * The fully qualified class name for the element this processor works on
+     * @return array
+     */
+    public static function getSupportedFields(): array
+    {
+        $fields = [
+            PlainText::class,
+            Number::class,
+            Color::class,
+            Checkboxes::class,
+            Dropdown::class,
+            Date::class,
+            Table::class,
+            RadioButtons::class,
+            Lightswitch::class,
+            Url::class,
+            Email::class,
+            MultiSelect::class
+        ];
+
+        if (\Craft::$app->plugins->isPluginInstalled('redactor')) {
+            $fields[] = RedactorField::class;
+        }
+
+        return $fields;
+    }
+
+    /**
+     * Returns the supported strategies for this field type
+     * @return array
+     */
+    public static function getSupportedStrategies(): array
+    {
+        return [BulkEdit::STRATEGY_REPLACE];
+    }
+
+
+    public static function performReplacement(Element $element, Field $field, $value): void
+    {
+
+    }
+}