没有为以下模块提供实现：Str

Question

我有一个使用 Str 模块的 OCaml 项目，但是在编译时，我得到这个错误：

$ make                            
ocaml setup.ml -build                                                    
Finished, 0 targets (0 cached) in 00:00:00.
+ /home/phase/.opam/system/bin/ocamlfind ocamlopt -g -linkpkg src/objects.cmx src/golf.cmx -o src/golf.native
File "_none_", line 1:                                                   
Error: No implementations provided for the following modules:            
         Str referenced from src/golf.cmx                                
Command exited with code 2.
Compilation unsuccessful after building 7 targets (6 cached) in 00:00:00.
E: Failure("Command ''/usr/bin/ocamlbuild' src/golf.native -tag debug' terminated with error code 10")
Makefile:7: recipe for target 'build' failed
make: *** [build] Error 1

这是一个包含以下 _oasis 文件的 Oasis 项目：

Name: GolfCaml
Version: 0.0.0
Synopsis: GolfScript Interpreter in OCaml
Authors: Jadon Fowler <jadonflower@gmail.com>
License: https://www.mozilla.org/en-US/MPL/2.0/

Description: GolfCaml is an interpreter for GolfScript in OCaml.
Homepage: http://jadonfowler.xyz/

OASISFormat: 0.4
BuildTools: ocamlbuild
Plugins: META (0.4), DevFiles (0.4)

Executable "golfcaml"
  Path: src
  MainIs: golf.ml
  CompiledObject: best

这里是有问题的代码：

(* Token Regex from http://www.golfscript.com/golfscript/syntax.html *)
let token_regex = Str.regexp "[a-zA-Z_][a-zA-Z0-9_]*|'(?:\.|[^'])*'?|\"(?:\.|[^\"])*\"?|-?[0-9]+|#[^\n\r]*|."

(* Iterate of a line and interpret each char *)
let interpret_line line =
  let tokens = Str.split token_regex line in
  List.iter (fun (x) -> printf "%s\n" x) tokens

Answer 1

你几乎成功了 ;-)

Str 不在标准库中所以你需要告诉 oasis 接受它。在您的 _oasis 文件中，只需在 Executable 部分添加一件事：

_绿洲

Executable "golfcaml"
  Path: src
  MainIs: golf.ml
  CompiledObject: best
  BuildDepends:
    str

它会很好地工作:

make
ocaml setup.ml -build 
Finished, 0 targets (0 cached) in 00:00:00.
Finished, 4 targets (0 cached) in 00:00:00.

Answer 2

我有类似的错误，但我使用 Ocamlbuild 而不是 Oasis。我将以下内容添加到我的 _tags 文件中：

true: use_str

Ocamlbuild documentation 将 use_str 列为已弃用，替换为 ocamlfind。但我没有安装后者，使标准包的 use_str 语法更方便。

没有为以下模块提供实现：Str

No implementations provided for the following modules: Str

ocaml

oasis