Perl:嘲笑 -d -f 和朋友.如何将它们放入 CORE::GLOBAL [英] Perl: mocking -d -f and friends. How to put them into CORE::GLOBAL

问题描述

CORE 文档向我展示了如何愉快地模拟各种已构建的 Perl 函数.但是，我不确定如何替换 '-d' &c.用我的方法.所以这实际上只是一个关于如何在 CORE::GLOBAL 中用破折号替换函数的问题.

The CORE documentation has shown me how to merrily mock various built Perl functions. However, I'm not really sure how to replace '-d' &c. with my methods. So this is really just a question on how do i replace a function with a dash in it in CORE::GLOBAL.

手动参考会很好.

package Testing::MockDir;

use strict;
use warnings;
use Exporter();
use Symbol 'qualify_to_ref';

*import = &Exporter::import;

our @EXPORT_OK = qw(SetMockDir UnsetMockDir);

our %EXPORT_TAGS = (
    'all' => @EXPORT_OK,
);

my %path2List = ();
my %handle2List = ();

BEGIN {
    *CORE::GLOBAL::opendir = &Testing::MockDir::opendir;
    *CORE::GLOBAL::readdir = &Testing::MockDir::readdir;
    *CORE::GLOBAL::closedir = &Testing::MockDir::closedir;

    ######################### the "-" is really the problem here
    *CORE::GLOBAL::-d = &Testing::MockDir::mock_d; # This does not work <<<<<
}

sub mock_d ($) {
    die 'It worked';
}

sub SetMockDir {
    my ($path, @files) = @_;
    $path2List{$path} = [@files];
}

sub UnsetMockDir {
    my ($path) = @_;
    delete $path2List{$path};
}

sub opendir (*$) {
    my $handle = qualify_to_ref(shift, caller);
    my ($path) = @_;
    return CORE::opendir($handle, $path) unless defined $path2List{$path};
    $handle2List{$handle} = $path2List{$path};
    return 1;
}

sub readdir (*) {
    my $handle = qualify_to_ref(shift, caller);
    return CORE::readdir($handle) unless defined $handle2List{$handle};
    return shift @{$handle2List{$handle}} unless wantarray;

    my @files = @{$handle2List{$handle}};
    $handle2List{$handle} = [];
    return @files;
}

sub closedir (*) {
    my $handle = qualify_to_ref(shift, caller);
    return CORE::closedir($handle) unless defined $handle2List{$handle};
    delete $handle2List{$handle};
    return 1;
}

1;

推荐答案

这可能是不可能的.perlsub 部分在 覆盖内置函数对于哪些函数可以被覆盖是模糊的.很多"可以，一些"不能，但除了少数例子之外，没有明确的列表.

It may not be possible. The perlsub section on Overriding Built-in Functions is vague about which functions can be overridden. "Many" can, "some" can't, but aside from a handful of examples there's no definitive list.

通常，我会试试这个:

{
    no strict 'refs';
    *{'CORE::GLOBAL::-d'} = &Testing::MockDir::mock_d;
}

这不是语法错误，但没有覆盖 -d 的效果.

which isn't a syntax error, but doesn't have the effect of overriding -d.

这篇关于Perl:嘲笑 -d -f 和朋友.如何将它们放入 CORE::GLOBAL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！