如何在prolog中读取文件并写入另一个文件 [英] How read a file and write another file in prolog

问题描述

我想读取一个文件，修改行并将结果写入另一个文件.

<预>读取文件:-open('inputfile.txt', read, Str),read_file(Str,Lines),关闭(Str).读取文件(流):-at_end_of_stream(流).读取文件(流):-\+ at_end_of_stream(流)，读取(流)，修改(流，流2)，写文件(流2)，读取文件(流).write_file('outputfile.txt', 短语) :-open('outputfile.txt', write, Stream),writeln(流，短语)，关闭(流).

解决方案

我会写类似的东西

transform_file :-open('inputfile.txt', read, I),open('outputfile.txt', write, O),变换线(I，O)，关闭(O)，关闭(一).transform_lines(I, O) :-read_line_to_codes(I, L),( L == end_of_file->真的;变换线(L，T)，格式(O, '~s~n', [T]),变换线(I，O)).

(注:未经测试)

I would like to read a file, modify lines and write the results to another file.

readtofile :-
    open('inputfile.txt', read, Str),
    read_file(Str,Lines),
    close(Str).


read_file(Stream) :-
    at_end_of_stream(Stream).

read_file(Stream) :-
    \+ at_end_of_stream(Stream),
    read(Stream),
    modify(Stream,Stream2),
    write_file(Stream2),    
    read_file(Stream).      


write_file('outputfile.txt', Phrase) :-
    open('outputfile.txt', write, Stream),
    writeln(Stream, Phrase),
    close(Stream).  

解决方案

I would write something like

tranform_file :-
    open('inputfile.txt', read, I),
    open('outputfile.txt', write, O),
    transform_lines(I, O),
    close(O),
    close(I).

transform_lines(I, O) :-
   read_line_to_codes(I, L),
   (  L == end_of_file
   -> true
   ;  transform_line(L, T),
      format(O, '~s~n', [T]),
      transform_lines(I, O)
   ).

(note: untested)

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