[英]How to use Jane Street's Core with Reason?
我是OCaml的新手,我正试图尝试(:P)Facebook Reason语法。 我无法找到一种方法来进行编译,因为如果找不到Core模块(已经安装了opam)。
我正在尝试从Real World OCaml编译一个示例程序
open Core.Std;
let rec read_and_accumulate accum => {
let line = In_channel.input_line In_channel.stdin;
switch line {
| None => accum
| Some x => read_and_accumulate (accum +. Float.of_string x)
}
};
let () = printf "Total: %F\n" (read_and_accumulate 0.);
这是我用于编译的命令: rebuild accum.native
。
当我在_tags
有这个时(来自https://janestreet.github.io/installation.html中的说明)
true: package(core,ppx_jane)
true: thread,debug
我的错误发生了变化,但我仍然不知道该怎么做:
File "_tags", line 1, characters 6-28:
Warning: tag "package" does not expect a parameter, but is used with parameter "core,ppx_jane"
File "_tags", line 1, characters 6-28:
Warning: the tag "package(core,ppx_jane)" is not used in any flag or dependency declaration, so it will have no effect; it may be a typo. Otherwise you can use `mark_tag_used` in your myocamlbuild.ml to disable this warning.
+ /Users/David/.opam/4.02.3/bin/ocamldep.opt -modules -pp refmt -impl accum2.re | tee accum2.re.depends accum2.ml.depends
accum2.re: Core Float In_channel
+ /Users/David/.opam/4.02.3/bin/ocamlc.opt -c -g -thread -pp '-g -thread' -pp refmt -o accum2.cmo -intf-suffix .rei -impl accum2.re
File "accum2.re", line 1, characters 5-13:
Error: Unbound module Core
Command exited with code 2.
Compilation unsuccessful after building 2 targets (0 cached) in 00:00:00.
使用Core with Reason需要做什么?
采用语法非常简单,我只阅读了几个小时,但是关于如何对非OCaml用户使用Reason的文档是零。
似乎最近在Reason repo中修复了该问题。 基本上,由于rebuild
是一个围绕reasonbuild
的包装器,因此可以直接运行reasonbuild
来解决这个问题:
env OCAMLFIND_COMMANDS="ocamlc=$(which reopt)" reasonbuild -use-ocamlfind accum.native
实际上, reasonbuild -use-ocamlfind accum.native
也适用于此。
基本上,必须添加https://janestreet.github.io/installation.html中指示的标记以及另外三个用于此案例的标记和值:
-linkpkg
用于静态链接我假设 -pp refmt
指示ReasonML预处理器 -impl file.re
告诉要读取的文件 因此,如果文件名为accum.re
则可以将其编译为本机二进制文件:
ocamlfind ocamlc -g -thread -package ppx_jane -package core -pp refmt -linkpkg -o accum.native -impl accum.re
我想rebuild
是ocamlbuild的包装器。 只需-use-ocamlfind
参数-use-ocamlfind
调用它-use-ocamlfind
。
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