Flow DSL
AST

从FBP到BPM

* http://en.wikipedia.org/wiki/Flow-based_programming

// Kind

// IO
//      input
//      output

// Node
//      name

// Edge
//      source
//      target

```json
{
  nodes: [
  ],
  edges: [
  ]
}
```

```rust
enum Kind {
}

struct Node {
  id: i64,
  name: String,
  kind: Kind,
}
```

## Nodes
* https://nodes.io/docs/getting-started/#what-nodes-is

0. Incoming trigger - connection from parent node
1. Outgoing trigger - connection to child nodes
2. Incoming parameter - with type color resulting in a colour picker widget in the inspector
3. Importing a package from npm (has to be added to the project first)
4. Trigger callback - this is usually called every frame
5. Reading properties provided by the parent node
6. Reading input parameter value
7. Main node code - drawing a rectangle with a given colour
8. Passing data further down to the child nodes

## Butterfly
* https://github.com/alibaba/butterfly
* https://butterfly-dag.gitee.io/butterfly-dag/demo/flow

## iMove
* https://www.yuque.com/imove/blog
* https://github.com/ykfe/imove

## logic-flow
* http://logic-flow.org/

## flowchart-fun
https://github.com/tone-row/flowchart-fun
https://js.cytoscape.org/

## Wireflow
https://github.com/vanila-io/wireflow

https://github.com/ritz078/transform