将局部变量合并到 perl 中的全局哈希中

Question

我需要将通用哈希（宏）合并到多个用户哈希中。实际上，这些都是在 perl 中写为 HoH/HoL 的规范。

我希望 'user' 规范采用带有自己修改的宏规范。在下面的示例中，变量“$v_Y”在 user1 和 user2 中需要具有不同的值。

我下面的内容不完全是代码，而是试图说明问题。我无法拥有 $v_Y 的多个值，因为 macro_spec 已经创建。

## this is in a package
my $MACRO_SPEC = {
  mkeyX   => "value_X",
  mkeyY   => $v_Y,
};

#this is USER1 package,
$v_Y = "U1_VALUE_X";
# use MACRO_SPEC
my $USER1 = (
  u1key1 => "u1value1",      u1macrokey => $MACRO_SPEC,  # need macro to interpolate 'local' $v_Y 
);

#this is USER2 package,
$v_Y = "U2_VALUE_X";
# use MACRO_SPEC
my $USER2 = (
  u2key1 => "u2value1",
  u2macrokey => $MACRO_SPEC,  # need macro to interpolate 'local' $v_Y 
);


#this is how USER1 should look after the interpolation
my $USER1 = (
  u1key1 => "u1value1",
  u1macrokey => { 
                  mkeyX   => "value_X",
                  mkeyY   => "U1_VALUE_X"
                },
);
#this is how USER2 should look after the interpolation
my $USER2 = (
  u2key1 => "u2value1",
  u1macrokey => {
                  mkeyX   => "value_X",
                  mkeyY   => "U2_VALUE_X"
                },
);

Answer 1

就像 melpomene 建议的那样，您希望 $MACRO_SPEC 成为一个每次调用时都可以生成不同内容的函数。

package One;
our $v_Y;
my $MACRO_SPEC = sub { +{ mkeyX => "value_X", mkeyY => $v_Y } };

...

package USER1;
$One::v_Y = "U1_VALUE_X";
my $user1 = {          # { }, not ( ), to define a hash reference
    u1key1 => "u1value1", 
    u1macrokey => $MACRO_SPEC->(),   # $f->() to exec code defined in $f
    ...
};

将局部变量合并到 perl 中的全局哈希中

incorporating local variables in a global hash in perl

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