[英]ocamlbuild with Toploop/TopLevel
I'm looking to implement an eval function like in this answer here: https://stackoverflow.com/a/33293116/ 我希望在此处实现此答案中的评估功能: https : //stackoverflow.com/a/33293116/
However, when I go to compile my code sample: 但是,当我去编译我的代码示例时:
let eval code =
let as_buf = Lexing.from_string code in
let parsed = !Toploop.parse_toplevel_phrase as_buf in
ignore (Toploop.execute_phrase true Format.std_formatter parsed)
let rec sum_until n =
if n = 0
then 0
else n + sum_until (n - 1);;
let a = print_string "Enter sum_until x where x = an int: "; read_line ();;
print_int eval a;;
with the following: 具有以下内容:
ocamlbuild UserInputEval.native -pkgs compiler-libs,compiler-libs.toplevel
I am getting the error: 我收到错误消息:
File "_none_", line 1: Error: Cannot find file
/usr/lib/ocaml/compiler-libs/ocamltoplevel.cmxa Command exited with
code 2.
I have checked the compiler-libs directory and I don't have an ocamltoplevel.cmxa file but I do have an ocamltoplevel.cma file. 我已经检查了editor-libs目录,但没有ocamltoplevel.cmxa文件,但确实有ocamltoplevel.cma文件。
I'm wondering if this is a simple fix? 我想知道这是否是简单的解决方法? I'm a bit new to ocaml so I'm not sure how to go about fixing this. 我对ocaml有点陌生,所以我不确定该如何解决。 Thanks! 谢谢!
The toplevel library is only available in bytecode mode: 顶级库仅在字节码模式下可用:
ocamlbuild UserInputEval.byte -pkgs compiler-libs,compiler-libs.toplevel
Note also that the compiler-libs package may need to be installed separately (this is at least the case for archlinux). 还要注意,也许需要单独安装editor-libs软件包(至少在archlinux中是这种情况)。
Nevertheless, your code is probably not doing what are you expecting: you are only feeding the user input to the toplevel interpreter without reading anything from the toplevel state. 但是,您的代码可能并没有达到您的期望:仅将用户输入提供给顶级解释器,而没有从顶级状态中读取任何内容。
If you just want to read an integer, you can do it with simply: 如果您只想读取一个整数,则可以使用以下方法简单地做到这一点:
let a = print_string "Enter sum_until x where x = an int: \n"; read_int ();;
print_int (sum_until a);;
without any need for compiler-libs. 无需编译器库。
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