cloudv-graph2expression

从图生成表达式，用于完成logicFlow -> liteFlow 数据交换格式的转化

e.g. 假设从logicFlow中获得了图结构，如下：

nodes = [
    {
      id: "a",
      properties: {
        isHead: true,
      },
    },
    {
      id: "b",
      properties: {},
    },
    {
      id: "c",
      properties: {},
    },
    {
      id: "d",
      properties: {},
    },
    {
      id: "e",
      properties: {
        isEnd: true
      },
    },
];
const edges = [
    {
      id: "a2b",
      sourceNodeId: "a",
      targetNodeId: "b",
      properties: {},
    },
    {
      id: "a2c",
      sourceNodeId: "a",
      targetNodeId: "c",
      properties: {},
    },
    {
      id: "a2d",
      sourceNodeId: "a",
      targetNodeId: "d",
      properties: {},
    },
    {
      id: "b2e",
      sourceNodeId: "b",
      targetNodeId: "e",
      properties: {},
    },
    {
      id: "c2e",
      sourceNodeId: "c",
      targetNodeId: "e",
      properties: {},
    },
    {
      id: "d2e",
      sourceNodeId: "d",
      targetNodeId: "e",
      properties: {},
    },
];

引入 graphToExpression

import graphToExpression from "cloudv-graph2expression";
const expression = graphToExpression(nodes, edges);
console.info(expression);

得到 expression:

THEN(a,THEN(WHEN(b,c,d),e))

值得注意的是：要求图结构的开始和结束节点均只能有一个，且需要用properties中的isEnd或isHead标识，这是目前的权宜之计，后期会根据传入数据进行校验，不满足生成规则后，则会提醒反馈；