Perl6:在其他模块中使用模块

Perl6: use module inside other module

我有 4 个文件。

start.pl6 用于运行我的程序。 3 个模块文件包含或生成最终由 start.pl6 使用的数据。我使用 atom.io 到 运行 代码。

代码如下:

start.pl6:

use v6;
use lib ".";
use file0;
use lib "folder1";
use file1;
use lib "folder2";
use file2;

say 'start';
my $file0 = file0.new();
say $file0.mystr;
my $file1 = file1.new();
say $file1.mystr;
my $file2 = file2.new();
say $file2.mystr;
say 'end';

file0.pm6:

class file0 is export {
  has Str $.mystr = "file 0";

  submethod BUILD() {
    say "hello file 0";
  }
}

file1.pm6:

class file1 is export {
  has Str $.mystr = "file 1";
}

file2.pm6:

class file2 is export {
  has Str $.mystr = "file 2";
}

输出:

start
hello file 0
file 0
file 1
file 2
end
[Finished in 0.51s]

我不想在 start.pl6 中创建所有 3 个模块文件的实例,而是想在 file1 中创建 file2 的实例,在 file0 中创建 file1 的实例。这样我只需要在 start.pl6 中创建一个 file0 的实例就可以看到相同的输出;

以下是我想到的更改:

file1.pm6:

use lib "../folder2";
use "file2.pl6"; 

class file1 is export {
  has Str $.mystr = "file 1";

  submethod BUILD() {
    my $file2 = file2.new();
    $!mystr = $!mystr ~ "\n" ~ $file2.mystr; 
        # I want to instantiate file2 inside the constructor, 
        # so I can be sure the line
        # $!mystr = $!mystr ~ "\n" ~ $file2.mystr; 
        # takes effect before i call any of file0's methods;
  }
}

file0.pm6:

use lib "folder1";
use "file1.pl6"; 

class file0 is export {
  has Str $.mystr = "file 0";

  submethod BUILD() {
    say "hello file 0";
    my $file1 = file1.new();
    $!mystr = $!mystr ~ "\n" ~ $file1.mystr; 
  }
}

在文件 0 中,行 使用库"folder1"; 使用 "file1.pl6"; 产生此错误:

===SORRY!=== Error while compiling C:\perlCode2\file0.pm6 (file0)
'use lib' may not be pre-compiled
at C:\perlCode2\file0.pm6 (file0):2
------> use lib "folder1/file1.pl6"<HERE>;
[Finished in 0.584s]

我是file1,行 使用库“../folder2”; 使用 "file2"; 不起作用,但也没有给出错误。我刚得到输出: [在 0.31 秒内完成]

最后,文件 start.pl6 应如下所示以产生输出:

start.pl6:

use v6;
use lib ".";
use file0;

say 'start';
my $file0 = file0.new();
say $file0.mystr;
say 'end';

输出:

start
hello file 0
file 0
file 1
file 2
end
use lib "folder2/file2.pl6";

这与您认为的不同。 use lib 需要一个 directory Perl 应该在其中寻找模块,而不是某些脚本的路径。

如果你的 My.pm6 在 ./lib 中(相对于当前工作目录)那么

use lib "lib";
use My;

成功了。也可以使用绝对路径

use lib "~/projects/perl6/MyProject/lib";
use My;

lib

你试图做的对我来说毫无意义。看来你把那些模块任意放在文件夹里了。


如果这些模块的名称确实有意义,我可能会这样构建它。

C:\perlCode2\start.pl6
C:\perlCode2\lib\file0.pm6
C:\perlCode2\lib\folder1\file1.pm6
C:\perlCode2\lib\folder2\file2.pm6

start.pl6:

use v6;

END say "[Finished in {(now - $*INIT-INSTANT).fmt("%0.2fs")}";

use lib 'lib';
use file0;

say 'start';
my $file0 = file0.new;
say $file0.mystr;
say 'end';

lib\file0.pm6:

use folder1::file1;

class file0 is export {
  has Str $.mystr = "file 0";

  submethod TWEAK() {
    say "hello file 0";
    $!mystr ~= "\n" ~ folder1::file1.new.mystr; 
  }
}

lib\folder1\file1.pm6:

use folder2::file2;

class folder1::file1 is export {
  has Str $.mystr = "file 1";

  submethod TWEAK() {
    $!mystr ~= "\n" ~ folder2::file2.new.mystr;
  }
}

lib\folder2\file2.pm6

class folder2::file2 is export {
  has Str $.mystr = "file 2";
}