[英]How to include camlp4 on emacs, ubuntu
我下面有源代码。 我知道这是行不通的,因为缺少camlp4。 现在我的操作系统是Ubuntu,我正在将caml模式用于emacs编辑器。 您能帮我为我的emacs配置camlp4,以便我运行此代码吗? 非常感谢
type term = V of string | F of string * term list
let rec symbols = function
| V x -> [x]
| F (f, ts) -> f :: [ g | t <- ts; g <- symbols t ]
let rec functions = function
| V _ -> []
| F (f, ts) -> f :: [ g | t <- ts; g <- functions t ]
您正在使用的列表理解是Camlp4的一部分。 要在终端仿真器中编译此代码,您应该输入
ocamlfind c -package camlp4.listcomprehension -syntax camlp4o -c a.ml
编译行与emacs或camlmode不相关。 但是,如果您想在顶层尝试此代码,则需要输入以下内容:
$ ocaml
OCaml version 4.02.1
Findlib has been successfully loaded. Additional directives:
#require "package";; to load a package
#list;; to list the available packages
#camlp4o;; to load camlp4 (standard syntax)
#camlp4r;; to load camlp4 (revised syntax)
#predicates "p,q,...";; to set these predicates
Topfind.reset();; to force that packages will be reloaded
#thread;; to enable threads
# #camlp4o;;
/home/kakadu/.opam/4.02.1/lib/ocaml/dynlink.cma: loaded
/home/kakadu/.opam/4.02.1/lib/ocaml/camlp4: added to search path
/home/kakadu/.opam/4.02.1/lib/ocaml/camlp4/camlp4o.cma: loaded
Camlp4 Parsing version 4.02.1
# #require "camlp4.listcomprehension";;
/home/kakadu/.opam/4.02.1/lib/ocaml/camlp4/Camlp4Parsers/Camlp4ListComprehension.cmo: loaded
# type term = V of string | F of string * term list;;
type term = V of string | F of string * term list
# let rec symbols = function
| V x -> [x]
| F (f, ts) -> f :: [ g | t <- ts; g <- symbols t ];;
val symbols : term -> string list = <fun>
$ cat ~/.ocamlinit
#use "topfind";;
要将camlp4安装到您的计算机上,您需要预编译的Ubuntu软件包或opam软件包。
非常感谢卡卡杜。 我想我想出了答案。 首先,我在ubuntu上安装camlp4。
apt-get install camlp4
apt-get install camlp4-extra
然后,在我的源代码中创建一个文件.ocamlinit并添加:
#load "dynlink.cma";;
#load "camlp4of.cma";;
我认为这些步骤已经解决了我上面的问题,
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