CORE文档告诉我如何快速模拟各种内置的Perl功能.但是,我并不确定如何替换’-d’和c.用我的方法所以这真的只是一个问题,我如何用CORE :: GLOBAL中的破折号替换一个函数.
手动参考将是不错的.
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;
解决方法
可能不可能
Overriding Built-in Functions上的
perlsub部分对于哪些功能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,没有明确的清单.
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的作用.