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Current File : /usr/share/perl5/vendor_perl/Carp.pm
package Carp;

{ use 5.006; }
use strict;
use warnings;

BEGIN {
    no strict "refs";
    if(exists($::{"utf8::"}) && exists(*{$::{"utf8::"}}{HASH}->{"is_utf8"}) &&
	    defined(*{*{$::{"utf8::"}}{HASH}->{"is_utf8"}}{CODE})) {
	*is_utf8 = \&{"utf8::is_utf8"};
    } else {
	*is_utf8 = sub { 0 };
    }
}

BEGIN {
    no strict "refs";
    if(exists($::{"utf8::"}) && exists(*{$::{"utf8::"}}{HASH}->{"downgrade"}) &&
	    defined(*{*{$::{"utf8::"}}{HASH}->{"downgrade"}}{CODE})) {
	*downgrade = \&{"utf8::downgrade"};
    } else {
	*downgrade = sub {};
    }
}

our $VERSION = '1.26';

our $MaxEvalLen = 0;
our $Verbose    = 0;
our $CarpLevel  = 0;
our $MaxArgLen  = 64;    # How much of each argument to print. 0 = all.
our $MaxArgNums = 8;     # How many arguments to print. 0 = all.

require Exporter;
our @ISA       = ('Exporter');
our @EXPORT    = qw(confess croak carp);
our @EXPORT_OK = qw(cluck verbose longmess shortmess);
our @EXPORT_FAIL = qw(verbose);    # hook to enable verbose mode

# The members of %Internal are packages that are internal to perl.
# Carp will not report errors from within these packages if it
# can.  The members of %CarpInternal are internal to Perl's warning
# system.  Carp will not report errors from within these packages
# either, and will not report calls *to* these packages for carp and
# croak.  They replace $CarpLevel, which is deprecated.    The
# $Max(EvalLen|(Arg(Len|Nums)) variables are used to specify how the eval
# text and function arguments should be formatted when printed.

our %CarpInternal;
our %Internal;

# disable these by default, so they can live w/o require Carp
$CarpInternal{Carp}++;
$CarpInternal{warnings}++;
$Internal{Exporter}++;
$Internal{'Exporter::Heavy'}++;

# if the caller specifies verbose usage ("perl -MCarp=verbose script.pl")
# then the following method will be called by the Exporter which knows
# to do this thanks to @EXPORT_FAIL, above.  $_[1] will contain the word
# 'verbose'.

sub export_fail { shift; $Verbose = shift if $_[0] eq 'verbose'; @_ }

sub _cgc {
    no strict 'refs';
    return \&{"CORE::GLOBAL::caller"} if defined &{"CORE::GLOBAL::caller"};
    return;
}

sub longmess {
    # Icky backwards compatibility wrapper. :-(
    #
    # The story is that the original implementation hard-coded the
    # number of call levels to go back, so calls to longmess were off
    # by one.  Other code began calling longmess and expecting this
    # behaviour, so the replacement has to emulate that behaviour.
    my $cgc = _cgc();
    my $call_pack = $cgc ? $cgc->() : caller();
    if ( $Internal{$call_pack} or $CarpInternal{$call_pack} ) {
        return longmess_heavy(@_);
    }
    else {
        local $CarpLevel = $CarpLevel + 1;
        return longmess_heavy(@_);
    }
}

our @CARP_NOT;

sub shortmess {
    my $cgc = _cgc();

    # Icky backwards compatibility wrapper. :-(
    local @CARP_NOT = $cgc ? $cgc->() : caller();
    shortmess_heavy(@_);
}

sub croak   { die shortmess @_ }
sub confess { die longmess @_ }
sub carp    { warn shortmess @_ }
sub cluck   { warn longmess @_ }

BEGIN {
    if("$]" >= 5.015002 || ("$]" >= 5.014002 && "$]" < 5.015) ||
	    ("$]" >= 5.012005 && "$]" < 5.013)) {
	*CALLER_OVERRIDE_CHECK_OK = sub () { 1 };
    } else {
	*CALLER_OVERRIDE_CHECK_OK = sub () { 0 };
    }
}

sub caller_info {
    my $i = shift(@_) + 1;
    my %call_info;
    my $cgc = _cgc();
    {
	# Some things override caller() but forget to implement the
	# @DB::args part of it, which we need.  We check for this by
	# pre-populating @DB::args with a sentinel which no-one else
	# has the address of, so that we can detect whether @DB::args
	# has been properly populated.  However, on earlier versions
	# of perl this check tickles a bug in CORE::caller() which
	# leaks memory.  So we only check on fixed perls.
        @DB::args = \$i if CALLER_OVERRIDE_CHECK_OK;
        package DB;
        @call_info{
            qw(pack file line sub has_args wantarray evaltext is_require) }
            = $cgc ? $cgc->($i) : caller($i);
    }

    unless ( defined $call_info{pack} ) {
        return ();
    }

    my $sub_name = Carp::get_subname( \%call_info );
    if ( $call_info{has_args} ) {
        my @args;
        if (CALLER_OVERRIDE_CHECK_OK && @DB::args == 1
            && ref $DB::args[0] eq ref \$i
            && $DB::args[0] == \$i ) {
            @DB::args = ();    # Don't let anyone see the address of $i
            local $@;
            my $where = eval {
                my $func    = $cgc or return '';
                my $gv      =
                    *{
                        ( $::{"B::"} || return '')       # B stash
                          ->{svref_2object} || return '' # entry in stash
                     }{CODE}                             # coderef in entry
                        ->($func)->GV;
                my $package = $gv->STASH->NAME;
                my $subname = $gv->NAME;
                return unless defined $package && defined $subname;

                # returning CORE::GLOBAL::caller isn't useful for tracing the cause:
                return if $package eq 'CORE::GLOBAL' && $subname eq 'caller';
                " in &${package}::$subname";
            } || '';
            @args
                = "** Incomplete caller override detected$where; \@DB::args were not set **";
        }
        else {
            @args = map { Carp::format_arg($_) } @DB::args;
        }
        if ( $MaxArgNums and @args > $MaxArgNums )
        {    # More than we want to show?
            $#args = $MaxArgNums;
            push @args, '...';
        }

        # Push the args onto the subroutine
        $sub_name .= '(' . join( ', ', @args ) . ')';
    }
    $call_info{sub_name} = $sub_name;
    return wantarray() ? %call_info : \%call_info;
}

# Transform an argument to a function into a string.
sub format_arg {
    my $arg = shift;
    if ( ref($arg) ) {
        $arg = defined($overload::VERSION) ? overload::StrVal($arg) : "$arg";
    }
    if ( defined($arg) ) {
        $arg =~ s/'/\\'/g;
        $arg = str_len_trim( $arg, $MaxArgLen );

        # Quote it?
        # Downgrade, and use [0-9] rather than \d, to avoid loading
        # Unicode tables, which would be liable to fail if we're
        # processing a syntax error.
        downgrade($arg, 1);
        $arg = "'$arg'" unless $arg =~ /^-?[0-9.]+\z/;
    }
    else {
        $arg = 'undef';
    }

    # The following handling of "control chars" is direct from
    # the original code - it is broken on Unicode though.
    # Suggestions?
    is_utf8($arg)
        or $arg =~ s/([[:cntrl:]]|[[:^ascii:]])/sprintf("\\x{%x}",ord($1))/eg;
    return $arg;
}

# Takes an inheritance cache and a package and returns
# an anon hash of known inheritances and anon array of
# inheritances which consequences have not been figured
# for.
sub get_status {
    my $cache = shift;
    my $pkg   = shift;
    $cache->{$pkg} ||= [ { $pkg => $pkg }, [ trusts_directly($pkg) ] ];
    return @{ $cache->{$pkg} };
}

# Takes the info from caller() and figures out the name of
# the sub/require/eval
sub get_subname {
    my $info = shift;
    if ( defined( $info->{evaltext} ) ) {
        my $eval = $info->{evaltext};
        if ( $info->{is_require} ) {
            return "require $eval";
        }
        else {
            $eval =~ s/([\\\'])/\\$1/g;
            return "eval '" . str_len_trim( $eval, $MaxEvalLen ) . "'";
        }
    }

    return ( $info->{sub} eq '(eval)' ) ? 'eval {...}' : $info->{sub};
}

# Figures out what call (from the point of view of the caller)
# the long error backtrace should start at.
sub long_error_loc {
    my $i;
    my $lvl = $CarpLevel;
    {
        ++$i;
        my $cgc = _cgc();
        my $pkg = $cgc ? $cgc->($i) : caller($i);
        unless ( defined($pkg) ) {

            # This *shouldn't* happen.
            if (%Internal) {
                local %Internal;
                $i = long_error_loc();
                last;
            }
            else {

                # OK, now I am irritated.
                return 2;
            }
        }
        redo if $CarpInternal{$pkg};
        redo unless 0 > --$lvl;
        redo if $Internal{$pkg};
    }
    return $i - 1;
}

sub longmess_heavy {
    return @_ if ref( $_[0] );    # don't break references as exceptions
    my $i = long_error_loc();
    return ret_backtrace( $i, @_ );
}

# Returns a full stack backtrace starting from where it is
# told.
sub ret_backtrace {
    my ( $i, @error ) = @_;
    my $mess;
    my $err = join '', @error;
    $i++;

    my $tid_msg = '';
    if ( defined &threads::tid ) {
        my $tid = threads->tid;
        $tid_msg = " thread $tid" if $tid;
    }

    my %i = caller_info($i);
    $mess = "$err at $i{file} line $i{line}$tid_msg";
    if( defined $. ) {
        local $@ = '';
        local $SIG{__DIE__};
        eval {
            CORE::die;
        };
        if($@ =~ /^Died at .*(, <.*?> line \d+).$/ ) {
            $mess .= $1;
        }
    }
    $mess .= "\.\n";

    while ( my %i = caller_info( ++$i ) ) {
        $mess .= "\t$i{sub_name} called at $i{file} line $i{line}$tid_msg\n";
    }

    return $mess;
}

sub ret_summary {
    my ( $i, @error ) = @_;
    my $err = join '', @error;
    $i++;

    my $tid_msg = '';
    if ( defined &threads::tid ) {
        my $tid = threads->tid;
        $tid_msg = " thread $tid" if $tid;
    }

    my %i = caller_info($i);
    return "$err at $i{file} line $i{line}$tid_msg\.\n";
}

sub short_error_loc {
    # You have to create your (hash)ref out here, rather than defaulting it
    # inside trusts *on a lexical*, as you want it to persist across calls.
    # (You can default it on $_[2], but that gets messy)
    my $cache = {};
    my $i     = 1;
    my $lvl   = $CarpLevel;
    {
        my $cgc = _cgc();
        my $called = $cgc ? $cgc->($i) : caller($i);
        $i++;
        my $caller = $cgc ? $cgc->($i) : caller($i);

        return 0 unless defined($caller);    # What happened?
        redo if $Internal{$caller};
        redo if $CarpInternal{$caller};
        redo if $CarpInternal{$called};
        redo if trusts( $called, $caller, $cache );
        redo if trusts( $caller, $called, $cache );
        redo unless 0 > --$lvl;
    }
    return $i - 1;
}

sub shortmess_heavy {
    return longmess_heavy(@_) if $Verbose;
    return @_ if ref( $_[0] );    # don't break references as exceptions
    my $i = short_error_loc();
    if ($i) {
        ret_summary( $i, @_ );
    }
    else {
        longmess_heavy(@_);
    }
}

# If a string is too long, trims it with ...
sub str_len_trim {
    my $str = shift;
    my $max = shift || 0;
    if ( 2 < $max and $max < length($str) ) {
        substr( $str, $max - 3 ) = '...';
    }
    return $str;
}

# Takes two packages and an optional cache.  Says whether the
# first inherits from the second.
#
# Recursive versions of this have to work to avoid certain
# possible endless loops, and when following long chains of
# inheritance are less efficient.
sub trusts {
    my $child  = shift;
    my $parent = shift;
    my $cache  = shift;
    my ( $known, $partial ) = get_status( $cache, $child );

    # Figure out consequences until we have an answer
    while ( @$partial and not exists $known->{$parent} ) {
        my $anc = shift @$partial;
        next if exists $known->{$anc};
        $known->{$anc}++;
        my ( $anc_knows, $anc_partial ) = get_status( $cache, $anc );
        my @found = keys %$anc_knows;
        @$known{@found} = ();
        push @$partial, @$anc_partial;
    }
    return exists $known->{$parent};
}

# Takes a package and gives a list of those trusted directly
sub trusts_directly {
    my $class = shift;
    no strict 'refs';
    no warnings 'once';
    return @{"$class\::CARP_NOT"}
        ? @{"$class\::CARP_NOT"}
        : @{"$class\::ISA"};
}

if(!defined($warnings::VERSION) ||
	do { no warnings "numeric"; $warnings::VERSION < 1.03 }) {
    # Very old versions of warnings.pm import from Carp.  This can go
    # wrong due to the circular dependency.  If Carp is invoked before
    # warnings, then Carp starts by loading warnings, then warnings
    # tries to import from Carp, and gets nothing because Carp is in
    # the process of loading and hasn't defined its import method yet.
    # So we work around that by manually exporting to warnings here.
    no strict "refs";
    *{"warnings::$_"} = \&$_ foreach @EXPORT;
}

1;

__END__

=head1 NAME

Carp - alternative warn and die for modules

=head1 SYNOPSIS

    use Carp;

    # warn user (from perspective of caller)
    carp "string trimmed to 80 chars";

    # die of errors (from perspective of caller)
    croak "We're outta here!";

    # die of errors with stack backtrace
    confess "not implemented";

    # cluck not exported by default
    use Carp qw(cluck);
    cluck "This is how we got here!";

=head1 DESCRIPTION

The Carp routines are useful in your own modules because
they act like die() or warn(), but with a message which is more
likely to be useful to a user of your module.  In the case of
cluck, confess, and longmess that context is a summary of every
call in the call-stack.  For a shorter message you can use C<carp>
or C<croak> which report the error as being from where your module
was called.  There is no guarantee that that is where the error
was, but it is a good educated guess.

You can also alter the way the output and logic of C<Carp> works, by
changing some global variables in the C<Carp> namespace. See the
section on C<GLOBAL VARIABLES> below.

Here is a more complete description of how C<carp> and C<croak> work.
What they do is search the call-stack for a function call stack where
they have not been told that there shouldn't be an error.  If every
call is marked safe, they give up and give a full stack backtrace
instead.  In other words they presume that the first likely looking
potential suspect is guilty.  Their rules for telling whether
a call shouldn't generate errors work as follows:

=over 4

=item 1.

Any call from a package to itself is safe.

=item 2.

Packages claim that there won't be errors on calls to or from
packages explicitly marked as safe by inclusion in C<@CARP_NOT>, or
(if that array is empty) C<@ISA>.  The ability to override what
@ISA says is new in 5.8.

=item 3.

The trust in item 2 is transitive.  If A trusts B, and B
trusts C, then A trusts C.  So if you do not override C<@ISA>
with C<@CARP_NOT>, then this trust relationship is identical to,
"inherits from".

=item 4.

Any call from an internal Perl module is safe.  (Nothing keeps
user modules from marking themselves as internal to Perl, but
this practice is discouraged.)

=item 5.

Any call to Perl's warning system (eg Carp itself) is safe.
(This rule is what keeps it from reporting the error at the
point where you call C<carp> or C<croak>.)

=item 6.

C<$Carp::CarpLevel> can be set to skip a fixed number of additional
call levels.  Using this is not recommended because it is very
difficult to get it to behave correctly.

=back

=head2 Forcing a Stack Trace

As a debugging aid, you can force Carp to treat a croak as a confess
and a carp as a cluck across I<all> modules. In other words, force a
detailed stack trace to be given.  This can be very helpful when trying
to understand why, or from where, a warning or error is being generated.

This feature is enabled by 'importing' the non-existent symbol
'verbose'. You would typically enable it by saying

    perl -MCarp=verbose script.pl

or by including the string C<-MCarp=verbose> in the PERL5OPT
environment variable.

Alternately, you can set the global variable C<$Carp::Verbose> to true.
See the C<GLOBAL VARIABLES> section below.

=head1 GLOBAL VARIABLES

=head2 $Carp::MaxEvalLen

This variable determines how many characters of a string-eval are to
be shown in the output. Use a value of C<0> to show all text.

Defaults to C<0>.

=head2 $Carp::MaxArgLen

This variable determines how many characters of each argument to a
function to print. Use a value of C<0> to show the full length of the
argument.

Defaults to C<64>.

=head2 $Carp::MaxArgNums

This variable determines how many arguments to each function to show.
Use a value of C<0> to show all arguments to a function call.

Defaults to C<8>.

=head2 $Carp::Verbose

This variable makes C<carp> and C<croak> generate stack backtraces
just like C<cluck> and C<confess>.  This is how C<use Carp 'verbose'>
is implemented internally.

Defaults to C<0>.

=head2 @CARP_NOT

This variable, I<in your package>, says which packages are I<not> to be
considered as the location of an error. The C<carp()> and C<cluck()>
functions will skip over callers when reporting where an error occurred.

NB: This variable must be in the package's symbol table, thus:

    # These work
    our @CARP_NOT; # file scope
    use vars qw(@CARP_NOT); # package scope
    @My::Package::CARP_NOT = ... ; # explicit package variable

    # These don't work
    sub xyz { ... @CARP_NOT = ... } # w/o declarations above
    my @CARP_NOT; # even at top-level

Example of use:

    package My::Carping::Package;
    use Carp;
    our @CARP_NOT;
    sub bar     { .... or _error('Wrong input') }
    sub _error  {
        # temporary control of where'ness, __PACKAGE__ is implicit
        local @CARP_NOT = qw(My::Friendly::Caller);
        carp(@_)
    }

This would make C<Carp> report the error as coming from a caller not
in C<My::Carping::Package>, nor from C<My::Friendly::Caller>.

Also read the L</DESCRIPTION> section above, about how C<Carp> decides
where the error is reported from.

Use C<@CARP_NOT>, instead of C<$Carp::CarpLevel>.

Overrides C<Carp>'s use of C<@ISA>.

=head2 %Carp::Internal

This says what packages are internal to Perl.  C<Carp> will never
report an error as being from a line in a package that is internal to
Perl.  For example:

    $Carp::Internal{ (__PACKAGE__) }++;
    # time passes...
    sub foo { ... or confess("whatever") };

would give a full stack backtrace starting from the first caller
outside of __PACKAGE__.  (Unless that package was also internal to
Perl.)

=head2 %Carp::CarpInternal

This says which packages are internal to Perl's warning system.  For
generating a full stack backtrace this is the same as being internal
to Perl, the stack backtrace will not start inside packages that are
listed in C<%Carp::CarpInternal>.  But it is slightly different for
the summary message generated by C<carp> or C<croak>.  There errors
will not be reported on any lines that are calling packages in
C<%Carp::CarpInternal>.

For example C<Carp> itself is listed in C<%Carp::CarpInternal>.
Therefore the full stack backtrace from C<confess> will not start
inside of C<Carp>, and the short message from calling C<croak> is
not placed on the line where C<croak> was called.

=head2 $Carp::CarpLevel

This variable determines how many additional call frames are to be
skipped that would not otherwise be when reporting where an error
occurred on a call to one of C<Carp>'s functions.  It is fairly easy
to count these call frames on calls that generate a full stack
backtrace.  However it is much harder to do this accounting for calls
that generate a short message.  Usually people skip too many call
frames.  If they are lucky they skip enough that C<Carp> goes all of
the way through the call stack, realizes that something is wrong, and
then generates a full stack backtrace.  If they are unlucky then the
error is reported from somewhere misleading very high in the call
stack.

Therefore it is best to avoid C<$Carp::CarpLevel>.  Instead use
C<@CARP_NOT>, C<%Carp::Internal> and C<%Carp::CarpInternal>.

Defaults to C<0>.

=head1 BUGS

The Carp routines don't handle exception objects currently.
If called with a first argument that is a reference, they simply
call die() or warn(), as appropriate.

=head1 SEE ALSO

L<Carp::Always>,
L<Carp::Clan>

=head1 AUTHOR

The Carp module first appeared in Larry Wall's perl 5.000 distribution.
Since then it has been modified by several of the perl 5 porters.
Andrew Main (Zefram) <zefram@fysh.org> divested Carp into an independent
distribution.

=head1 COPYRIGHT

Copyright (C) 1994-2012 Larry Wall

Copyright (C) 2011, 2012 Andrew Main (Zefram) <zefram@fysh.org>

=head1 LICENSE

This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

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