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Setting it to a random integer will guarantee # segfaults. $^H{regcomp} = install(); } else { delete $^H{regcomp}; } } sub bits { my $on = shift; my $bits = 0; my $turning_all_off = ! @_ && ! $on; if ($turning_all_off) { # Pretend were called with certain parameters, which are best dealt # with that way. push @_, keys %bitmask; # taint and eval push @_, 'strict'; } # Process each subpragma parameter ARG: foreach my $idx (0..$#_){ my $s=$_[$idx]; if ($s eq 'Debug' or $s eq 'Debugcolor') { setcolor() if $s =~/color/i; ${^RE_DEBUG_FLAGS} = 0 unless defined ${^RE_DEBUG_FLAGS}; for my $idx ($idx+1..$#_) { if ($flags{$_[$idx]}) { if ($on) { ${^RE_DEBUG_FLAGS} |= $flags{$_[$idx]}; } else { ${^RE_DEBUG_FLAGS} &= ~ $flags{$_[$idx]}; } } else { require Carp; Carp::carp("Unknown \"re\" Debug flag '$_[$idx]', possible flags: ", join(", ",sort keys %flags ) ); } } _load_unload($on ? 1 : ${^RE_DEBUG_FLAGS}); last; } elsif ($s eq 'debug' or $s eq 'debugcolor') { setcolor() if $s =~/color/i; _load_unload($on); last; } elsif (exists $bitmask{$s}) { $bits |= $bitmask{$s}; } elsif ($EXPORT_OK{$s}) { require Exporter; re->export_to_level(2, 're', $s); } elsif ($s eq 'strict') { if ($on) { $^H{reflags} |= $reflags{$s}; warnings::warnif('experimental::re_strict', "\"use re 'strict'\" is experimental"); # Turn on warnings if not already done. if (! warnings::enabled('regexp')) { require warnings; warnings->import('regexp'); $^H{re_strict} = 1; } } else { $^H{reflags} &= ~$reflags{$s} if $^H{reflags}; # Turn off warnings if we turned them on. warnings->unimport('regexp') if $^H{re_strict}; } if ($^H{reflags}) { $^H |= $flags_hint; } else { $^H &= ~$flags_hint; } } elsif ($s =~ s/^\///) { my $reflags = $^H{reflags} || 0; my $seen_charset; my $x_count = 0; while ($s =~ m/( . )/gx) { local $_ = $1; if (/[adul]/) { # The 'a' may be repeated; hide this from the rest of the # code by counting and getting rid of all of them, then # changing to 'aa' if there is a repeat. if ($_ eq 'a') { my $sav_pos = pos $s; my $a_count = $s =~ s/a//g; pos $s = $sav_pos - 1; # -1 because got rid of the 'a' if ($a_count > 2) { require Carp; Carp::carp( qq 'The "a" flag may only appear a maximum of twice' ); } elsif ($a_count == 2) { $_ = 'aa'; } } if ($on) { if ($seen_charset) { require Carp; if ($seen_charset ne $_) { Carp::carp( qq 'The "$seen_charset" and "$_" flags ' .qq 'are exclusive' ); } else { Carp::carp( qq 'The "$seen_charset" flag may not appear ' .qq 'twice' ); } } $^H{reflags_charset} = $reflags{$_}; $seen_charset = $_; } else { delete $^H{reflags_charset} if defined $^H{reflags_charset} && $^H{reflags_charset} == $reflags{$_}; } } elsif (exists $reflags{$_}) { if ($_ eq 'x') { $x_count++; if ($x_count > 2) { require Carp; Carp::carp( qq 'The "x" flag may only appear a maximum of twice' ); } elsif ($x_count == 2) { $_ = 'xx'; # First time through got the /x } } $on ? $reflags |= $reflags{$_} : ($reflags &= ~$reflags{$_}); } else { require Carp; Carp::carp( qq'Unknown regular expression flag "$_"' ); next ARG; } } ($^H{reflags} = $reflags or defined $^H{reflags_charset}) ? $^H |= $flags_hint : ($^H &= ~$flags_hint); } else { require Carp; Carp::carp("Unknown \"re\" subpragma '$s' (known ones are: ", join(', ', map {qq('$_')} 'debug', 'debugcolor', sort keys %bitmask), ")"); } } if ($turning_all_off) { _load_unload(0); $^H{reflags} = 0; $^H{reflags_charset} = 0; $^H &= ~$flags_hint; } $bits; } sub import { shift; $^H |= bits(1, @_); } sub unimport { shift; $^H &= ~ bits(0, @_); } 1; __END__