// 嵌套式结构
function submit(data) {
  if (data) {
    if (data.valid) {
      // 主逻辑
    } else {
      throw new Error('Data invalid');
    }
  } else {
    throw new Error('Data not exist');
  }
}

// 卫语句结构
function submit(data) {
  if (!data) throw new Error('Data not exist');
  if (!data.valid) throw new Error('Data invalid');

  // 主逻辑
}

function validateWorkflow(workflow) {
  if (!isDAG(workflow)) {
    ElMessage.error('工作流存在循环，请检查连线');
    return false;
  }

  if (!allExecutablesValid(workflow)) {
    ElMessage.error('存在未绑定服务的执行节点');
    return false;
  }

  if (!startNodesHaveInputs(workflow)) {
    ElMessage.error('起始节点未设置输入参数或文件');
    return false;
  }

  if (!modelMetaCompleted(workflow)) {
    ElMessage.error('模型元信息不完整');
    return false;
  }

  return true;
}

// validator/isDAG.ts
export function checkDAG(workflow): boolean {
  const isValid = isDAG(workflow);
  if (!isValid) ElMessage.error('工作流存在循环，请检查连线');
  return isValid;
}

// validator/isExecutable.ts
export function checkExecutables(workflow): boolean {
  const valid = allExecutablesValid(workflow);
  if (!valid) ElMessage.error('存在未绑定服务的执行节点');
  return valid;
}

import { checkDAG } from './validator/isDAG';
import { checkExecutables } from './validator/isExecutable';
// ...

function validateWorkflow(workflow) {
  return checkDAG(workflow)
      && checkExecutables(workflow)
      && checkStartNodeInputs(workflow)
      && checkModelMeta(workflow);
}

function onSubmitWorkflow() {
  const valid = validateWorkflow(workflow.value);

  if (!valid) return;

  // 合法则提交后端
  postWorkflow(workflow.value);
}