Prolog - 如何替换列表中的某些单词 [英] Prolog - How to replace certain words in a list

问题描述

我有以下序言谓词:

processWords([hello, my, name, is, Simon], Result).

我需要知道如何获得:

Result = [bye, my, name, is, Ben]

我将如何遍历列表并返回替换hello"的字符串?用再见"和西蒙"与Ben"一起使用 Prolog?

How would I recurse through the list and return a string that replaces "hello" with "bye" and "Simon" with "Ben", using Prolog?

非常感谢任何帮助，谢谢！

Any help is greatly appreciated, thanks!

推荐答案

首先，这是不可能的，因为西蒙"和本"在你的例子中是变量.但假设你对西蒙"没问题和本"，这是一个答案:

First of all, this cannot be done, since "Simon" and "Ben" in your example are variables. But supposing you are fine with "simon" and "ben", here is an answer:

processWords([], []).

processWords([H|T], [H2|T2]) :-
    translate(H, H2),
    processWords(T, T2).

translate(hello, bye):-!.
translate(simon, ben):-!.
translate(X, X). % catch-all clause for all words not to be translated

或者，您可以使用 maplist/3:

processWords(L,L2):-maplist(translate, L, L2).

translate(hello, bye):- !.
translate(simon, ben):- !.
translate(X, X). % catch-all clause for all words not to be translated

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