我无法让我的 Prolog DCG 与 atom concat 一起工作 [英] I can't get my Prolog DCG working with atom concat

问题描述

我无法让这个 Prolog DCG 代码工作:

I can't get this Prolog DCG code working:

String1="   ",string_codes(String1,Codes),phrase(spaces(Output),Codes).

spaces(XXs) -->
   [X], {X=32}, spaces(Xs),
   {char_code(Ch,X), atom_concat(Ch,Xs,XXs)}, !. %%Space
spaces([]) --> [].

推荐答案

我觉得改进后的解决方案可能是这样的:

I feel like an improved solution would probably be something like this:

spaces(Spaces) --> " ", spaces(S0), { atom_concat(' ', S0, Spaces) }.
spaces('') --> [].

没有必要问代码 32 的字符是什么，你知道它是一个空格.此外，您的答案中的 [X], {X=32} 比 [32] 更好，而 " " 则更好.

There's no real need to ask what the char is for code 32, you know it's a space. Also, [X], {X=32} from your answer is better as [32], which is still better as " ".

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