feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/workflow/playground/src/services/value-expression-service.ts

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { type FlowNodeEntity } from '@flowgram-adapter/free-layout-editor';
+import {
+  type ValueExpression,
+  type ValueExpressionDTO,
+  type RefExpression,
+} from '@coze-workflow/variable';
+
+export abstract class ValueExpressionService {
+  /**
+   * 判断值是否为值表达式
+   * @param value 值
+   * @returns 是否为值表达式
+   */
+  abstract isValueExpression(value: unknown): boolean;
+
+  /**
+   * 判断值是否为值表达式DTO
+   * @param value 值
+   * @returns 是否为值表达式DTO
+   */
+  abstract isValueExpressionDTO(value: unknown): boolean;
+
+  /**
+   * 判断值是否为引用表达式
+   * @param value 值
+   * @returns 是否为引用表达式
+   */
+  abstract isRefExpression(value: unknown): boolean;
+
+  /**
+   * 判断值是否为字面量表达式
+   * @param value 值
+   * @returns 是否为字面量表达式
+   */
+  abstract isLiteralExpression(value: RefExpression): boolean;
+
+  /**
+   * 判断引用表达式变量是否存在
+   * @param value 引用表达式
+   * @param node 当前节点
+   * @returns 是否存在
+   */
+  abstract isRefExpressionVariableExists(
+    value: RefExpression,
+    node: FlowNodeEntity,
+  ): boolean;
+
+  /**
+   * 将值表达式转换为DTO
+   * @param valueExpression 值表达式
+   * @param currentNode 当前节点
+   * @returns 值表达式DTO
+   */
+  abstract toDTO(
+    valueExpression?: ValueExpression,
+    currentNode?: FlowNodeEntity,
+  ): ValueExpressionDTO | undefined;
+
+  /**
+   * 将值表达式DTO转换为值表达式
+   * @param dto 值表达式DTO
+   * @returns 值表达式
+   */
+  abstract toVO(dto?: ValueExpressionDTO): ValueExpression | undefined;
+}