ocaml - Can opa extensions be written in Ocaml?

Question

I notice that included in the source of the OpaWhiteBoard example, there is a .ml file here: https://github.com/hhugo/OpaWhiteBoard/blob/master/src/opacairo/cairo.ml

This appears to be OCaml with some directives ("##"). I'm guessing this means it's possible to write extensions to Opa in OCaml, correct?

Answer 1

是的，您可以使用 OPA-plugin-builder。

这本书仍在进行中（http://opalang.org/resources/book/index.html），我们将尽快完成插件构建器部分。

但是您可以通过查看 Makefile 猜出它是如何工作的： https ://github.com/hhugo/OpaWhiteBoard/blob/master/Makefile

以及 cairo.ml 插件： https ://github.com/hhugo/OpaWhiteBoard/blob/master/src/opacairo/cairo.ml

'##' 指令特别用于在 OPA 中注册函数及其类型。

Answer 2

更准确地说，您可以在这里获得一些信息和示例：http: //opalang.org/resources/book/index.html#hello_binding