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package DBICTest::Util::OverrideRequire;
# no use/require of any kind - work bare
BEGIN {
# Neat STDERR require call tracer
#
# 0 - no trace
# 1 - just requires and return values
# 2 - neat stacktrace (assumes that the supplied $override_cref does *not* (ab)use goto)
# 3 - full stacktrace
*TRACE = sub () { 0 };
}
# Takes a single coderef and replaces CORE::GLOBAL::require with it.
#
# On subsequent require() calls, the coderef will be invoked with
# two arguments - ($next_require, $module_name_copy)
#
# $next_require is a coderef closing over the module name. It needs
# to be invoked at some point without arguments for the actual
# require to take place (this way your coderef in essence becomes an
# around modifier)
#
# $module_name_copy is a string-copy of what $next_require is closing
# over. The reason for the copy is that you may trigger a side effect
# on magical values, and subsequently abort the require (e.g.
# require v.5.8.8 magic)
#
# All of this almost verbatim copied from Lexical::SealRequireHints
# Zefram++
sub override_global_require (&) {
my $override_cref = shift;
our $next_require = defined(&CORE::GLOBAL::require)
? \&CORE::GLOBAL::require
: sub {
my ($arg) = @_;
# The shenanigans with $CORE::GLOBAL::{require}
# are required because if there's a
# &CORE::GLOBAL::require when the eval is
# executed then the CORE::require in there is
# interpreted as plain require on some Perl
# versions, leading to recursion.
my $grequire = delete $CORE::GLOBAL::{require};
my $res = eval sprintf '
local $SIG{__DIE__};
$CORE::GLOBAL::{require} = $grequire;
package %s;
CORE::require($arg);
', scalar caller(0); # the caller already had its package replaced
my $err = $@ if $@ ne '';
if( TRACE ) {
if (TRACE == 1) {
printf STDERR "Require of '%s' (returned: '%s')\n",
(my $m_copy = $arg),
(my $r_copy = $res),
;
}
else {
my ($fr_num, @fr, @tr, $excise);
while (@fr = caller($fr_num++)) {
# Package::Stash::XS is a cock and gets mightily confused if one
# uses a regex in the require hook. Even though it happens only
# on < 5.8.7 it's still rather embarassing (also wtf does P::S::XS
# even need to regex its own module name?!). So we do not use re :)
if (TRACE == 3 or (index($fr[1], '(eval ') != 0 and index($fr[1], __FILE__) != 0) ) {
push @tr, [@fr]
}
# the caller before this would be the override site - kill it away
# if the cref writer uses goto - well tough, tracer won't work
if ($fr[3] eq 'DBICTest::Util::OverrideRequire::__ANON__') {
$excise ||= $tr[-2]
if TRACE == 2;
}
}
my @stack =
map { "$_->[1], line $_->[2]" }
grep { ! $excise or $_->[1] ne $excise->[1] or $_->[2] ne $excise->[2] }
@tr
;
printf STDERR "Require of '%s' (returned: '%s')\n%s\n\n",
(my $m_copy = $arg),
(my $r_copy = $res||''),
join "\n", (map { " $_" } @stack)
;
}
}
die $err if defined $err;
return $res;
}
;
# Need to suppress the redefinition warning, without
# invoking warnings.pm.
BEGIN { ${^WARNING_BITS} = ""; }
*CORE::GLOBAL::require = sub {
die "wrong number of arguments to require\n"
unless @_ == 1;
# the copy is to prevent accidental overload firing (e.g. require v5.8.8)
my ($arg_copy) = our ($arg) = @_;
return $override_cref->(sub {
die "The require delegate takes no arguments\n"
if @_;
my $res = eval sprintf '
local $SIG{__DIE__};
package %s;
$next_require->($arg);
', scalar caller(2); # 2 for the indirection of the $override_cref around
die $@ if $@ ne '';
return $res;
}, $arg_copy);
}
}
1;
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