package Carp;
-our $VERSION = '1.11';
-# this file is an utra-lightweight stub. The first time a function is
-# called, Carp::Heavy is loaded, and the real short/longmessmess_jmp
-# subs are installed
+our $VERSION = '1.12';
our $MaxEvalLen = 0;
our $Verbose = 0;
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
+# $Max(EvalLen|(Arg(Len|Nums)) variables are used to specify how the eval
+# text and function arguments should be formatted when printed.
+
+# disable these by default, so they can live w/o require Carp
+$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
sub export_fail { shift; $Verbose = shift if $_[0] eq 'verbose'; @_ }
-# fixed hooks for stashes to point to
-sub longmess { goto &longmess_jmp }
-sub shortmess { goto &shortmess_jmp }
-# these two are replaced when Carp::Heavy is loaded
-sub longmess_jmp {
- local($@, $!);
- eval { require Carp::Heavy };
- return $@ if $@;
- goto &longmess_real;
-}
-sub shortmess_jmp {
- local($@, $!);
- eval { require Carp::Heavy };
- return $@ if $@;
- goto &shortmess_real;
-}
+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 $call_pack = caller();
+ if ($Internal{$call_pack} or $CarpInternal{$call_pack}) {
+ return longmess_heavy(@_);
+ }
+ else {
+ local $CarpLevel = $CarpLevel + 1;
+ return longmess_heavy(@_);
+ }
+};
+
+sub shortmess {
+ # Icky backwards compatibility wrapper. :-(
+ local @CARP_NOT = caller();
+ shortmess_heavy(@_);
+};
sub croak { die shortmess @_ }
sub confess { die longmess @_ }
sub carp { warn shortmess @_ }
sub cluck { warn longmess @_ }
+sub caller_info {
+ my $i = shift(@_) + 1;
+ package DB;
+ my %call_info;
+ @call_info{
+ qw(pack file line sub has_args wantarray evaltext is_require)
+ } = caller($i);
+
+ unless (defined $call_info{pack}) {
+ return ();
+ }
+
+ my $sub_name = Carp::get_subname(\%call_info);
+ if ($call_info{has_args}) {
+ my @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?
+ $arg = "'$arg'" unless $arg =~ /^-?[\d.]+\z/;
+ } else {
+ $arg = 'undef';
+ }
+
+ # The following handling of "control chars" is direct from
+ # the original code - it is broken on Unicode though.
+ # Suggestions?
+ utf8::is_utf8($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;
+ {
+ my $pkg = caller(++$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\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 $called = caller($i++);
+ my $caller = caller($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"};
+}
+
1;
+
__END__
=head1 NAME
ok(1);
# test for caller_info API
-my $eval = "use Carp::Heavy; return Carp::caller_info(0);";
+my $eval = "use Carp; return Carp::caller_info(0);";
my %info = eval($eval);
is($info{sub_name}, "eval '$eval'", 'caller_info API');
-# test for '...::CARP_NOT used only once' warning from Carp::Heavy
+# test for '...::CARP_NOT used only once' warning from Carp
my $warning;
eval {
BEGIN {
package Z;
BEGIN { eval { Carp::croak() } }
};
-ok !$warning, q/'...::CARP_NOT used only once' warning from Carp::Heavy/;
+ok !$warning, q/'...::CARP_NOT used only once' warning from Carp/;
# Test the location of error messages.
like(A::short(), qr/^Error at C/, "Short messages skip carped package");
-# Carp::Heavy uses some variables in common with Carp.
package Carp;
-=head1 NAME
-
-Carp::Heavy - heavy machinery, no user serviceable parts inside
-
-=cut
-
# On one line so MakeMaker will see it.
use Carp; our $VERSION = $Carp::VERSION;
-# use strict; # not yet
-
-# 'use Carp' just installs some very lightweight stubs; the first time
-# these are called, they require Carp::Heavy which installs the real
-# routines.
-
-# 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
-# $Max(EvalLen|(Arg(Len|Nums)) variables are used to specify how the eval
-# text and function arguments should be formatted when printed.
-
-# disable these by default, so they can live w/o require Carp
-$CarpInternal{Carp}++;
-$CarpInternal{warnings}++;
-$Internal{Exporter}++;
-$Internal{'Exporter::Heavy'}++;
-
-
-our ($CarpLevel, $MaxArgNums, $MaxEvalLen, $MaxArgLen, $Verbose);
-
-# XXX longmess_real and shortmess_real should really be merged into
-# XXX {long|sort}mess_heavy at some point
-
-sub longmess_real {
- # 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 $call_pack = caller();
- if ($Internal{$call_pack} or $CarpInternal{$call_pack}) {
- return longmess_heavy(@_);
- }
- else {
- local $CarpLevel = $CarpLevel + 1;
- return longmess_heavy(@_);
- }
-};
-
-sub shortmess_real {
- # Icky backwards compatibility wrapper. :-(
- local @CARP_NOT = caller();
- shortmess_heavy(@_);
-};
-
-# replace the two hooks added by Carp
-
-# aliasing the whole glob rather than just the CV slot avoids 'redefined'
-# warnings, even in the presence of perl -W (as used by lib/warnings.t !)
-# However it has the potential to create infinite loops, if somehow Carp
-# is forcibly reloaded, but $INC{"Carp/Heavy.pm"} remains true.
-# Hence the extra hack of deleting the previous typeglob first.
-
-delete $Carp::{shortmess_jmp};
-delete $Carp::{longmess_jmp};
-*longmess_jmp = *longmess_real;
-*shortmess_jmp = *shortmess_real;
-
-
-sub caller_info {
- my $i = shift(@_) + 1;
- package DB;
- my %call_info;
- @call_info{
- qw(pack file line sub has_args wantarray evaltext is_require)
- } = caller($i);
-
- unless (defined $call_info{pack}) {
- return ();
- }
-
- my $sub_name = Carp::get_subname(\%call_info);
- if ($call_info{has_args}) {
- my @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?
- $arg = "'$arg'" unless $arg =~ /^-?[\d.]+\z/;
- } else {
- $arg = 'undef';
- }
-
- # The following handling of "control chars" is direct from
- # the original code - it is broken on Unicode though.
- # Suggestions?
- utf8::is_utf8($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;
- {
- my $pkg = caller(++$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\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 $called = caller($i++);
- my $caller = caller($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"};
-}
1;
+# Most of the machinery of Carp used to be there.
+# It has been moved in Carp.pm now, but this placeholder remains for
+# the benefit of modules that like to preload Carp::Heavy directly.
projects / p5sagit/p5-mst-13.2.git / commitdiff