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Edit File : Utils.pm \| Size : 3.44 KB
package ExtUtils::Constant::Utils; use strict; use vars qw($VERSION @EXPORT_OK @ISA); use Carp; @ISA = 'Exporter'; @EXPORT_OK = qw(C_stringify perl_stringify); $VERSION = '0.03'; use constant is_perl55 => ($] < 5.005_50); use constant is_perl56 => ($] < 5.007 && $] > 5.005_50); use constant is_sane_perl => $] > 5.007; =head1 NAME ExtUtils::Constant::Utils - helper functions for ExtUtils::Constant =head1 SYNOPSIS use ExtUtils::Constant::Utils qw (C_stringify); $C_code = C_stringify $stuff; =head1 DESCRIPTION ExtUtils::Constant::Utils packages up utility subroutines used by ExtUtils::Constant, ExtUtils::Constant::Base and derived classes. All its functions are explicitly exportable. =head1 USAGE =over 4 =item C_stringify NAME A function which returns a 7 bit ASCII correctly \ escaped version of the string passed suitable for C's "" or ''. It will die if passed Unicode characters. =cut # Hopefully make a happy C identifier. sub C_stringify { local $_ = shift; return unless defined $_; # grr 5.6.1 confess "Wide character in '$_' intended as a C identifier" if tr/\0-\377// != length; # grr 5.6.1 moreso because its regexps will break on data that happens to # be utf8, which includes my 8 bit test cases. $_ = pack 'C', unpack 'U', $_ . pack 'U*' if is_perl56; s/\\/\\\\/g; s/([\"\'])/\\$1/g; # Grr. fix perl mode. s/\n/\\n/g; # Ensure newlines don't end up in octal s/\r/\\r/g; s/\t/\\t/g; s/\f/\\f/g; s/\a/\\a/g; unless (is_perl55) { # This will elicit a warning on 5.005_03 about [: :] being reserved unless # I cheat my $cheat = '([[:^print:]])'; if (ord('A') == 193) { # EBCDIC has no ^\0-\177 workalike. s/$cheat/sprintf "\\%03o", ord $1/ge; } else { s/([^\0-\177])/sprintf "\\%03o", ord $1/ge; } s/$cheat/sprintf "\\%03o", ord $1/ge; } else { require POSIX; s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge; } $_; } =item perl_stringify NAME A function which returns a 7 bit ASCII correctly \ escaped version of the string passed suitable for a perl "" string. =cut # Hopefully make a happy perl identifier. sub perl_stringify { local $_ = shift; return unless defined $_; s/\\/\\\\/g; s/([\"\'])/\\$1/g; # Grr. fix perl mode. s/\n/\\n/g; # Ensure newlines don't end up in octal s/\r/\\r/g; s/\t/\\t/g; s/\f/\\f/g; s/\a/\\a/g; unless (is_perl55) { # This will elicit a warning on 5.005_03 about [: :] being reserved unless # I cheat my $cheat = '([[:^print:]])'; if (is_sane_perl) { if (ord('A') == 193) { # EBCDIC has no ^\0-\177 workalike. s/$cheat/sprintf "\\x{%X}", ord $1/ge; } else { s/([^\0-\177])/sprintf "\\x{%X}", ord $1/ge; } } else { # Grr 5.6.1. And I don't think I can use utf8; to force the regexp # because 5.005_03 will fail. # This is grim, but I also can't split on // my $copy; foreach my $index (0 .. length ($_) - 1) { my $char = substr ($_, $index, 1); $copy .= ($char le "\177") ? $char : sprintf "\\x{%X}", ord $char; } $_ = $copy; } s/$cheat/sprintf "\\%03o", ord $1/ge; } else { # Turns out "\x{}" notation only arrived with 5.6 s/([^\0-\177])/sprintf "\\x%02X", ord $1/ge; require POSIX; s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge; } $_; } 1; __END__ =back =head1 AUTHOR Nicholas Clark <nick@ccl4.org> based on the code in C<h2xs> by Larry Wall and others Back

Edit File : Utils.pm | Size : 3.44 KB

package ExtUtils::Constant::Utils;

use strict;
use vars qw($VERSION @EXPORT_OK @ISA);
use Carp;

@ISA = 'Exporter';
@EXPORT_OK = qw(C_stringify perl_stringify);
$VERSION = '0.03';

use constant is_perl55 => ($] < 5.005_50);
use constant is_perl56 => ($] < 5.007 && $] > 5.005_50);
use constant is_sane_perl => $] > 5.007;

=head1 NAME

ExtUtils::Constant::Utils - helper functions for ExtUtils::Constant

=head1 SYNOPSIS

use ExtUtils::Constant::Utils qw (C_stringify);
    $C_code = C_stringify $stuff;

=head1 DESCRIPTION

ExtUtils::Constant::Utils packages up utility subroutines used by
ExtUtils::Constant, ExtUtils::Constant::Base and derived classes. All its
functions are explicitly exportable.

=head1 USAGE

=over 4

=item C_stringify NAME

A function which returns a 7 bit ASCII correctly \ escaped version of the
string passed suitable for C's "" or ''. It will die if passed Unicode
characters.

=cut

# Hopefully make a happy C identifier.
sub C_stringify {
  local $_ = shift;
  return unless defined $_;
  # grr 5.6.1
  confess "Wide character in '$_' intended as a C identifier"
    if tr/\0-\377// != length;
  # grr 5.6.1 moreso because its regexps will break on data that happens to
  # be utf8, which includes my 8 bit test cases.
  $_ = pack 'C*', unpack 'U*', $_ . pack 'U*' if is_perl56;
  s/\\/\\\\/g;
  s/([\"\'])/\\$1/g;	# Grr. fix perl mode.
  s/\n/\\n/g;		# Ensure newlines don't end up in octal
  s/\r/\\r/g;
  s/\t/\\t/g;
  s/\f/\\f/g;
  s/\a/\\a/g;
  unless (is_perl55) {
    # This will elicit a warning on 5.005_03 about [: :] being reserved unless
    # I cheat
    my $cheat = '([[:^print:]])';

if (ord('A') == 193) { # EBCDIC has no ^\0-\177 workalike.
      s/$cheat/sprintf "\\%03o", ord $1/ge;
    } else {
      s/([^\0-\177])/sprintf "\\%03o", ord $1/ge;
    }

s/$cheat/sprintf "\\%03o", ord $1/ge;
  } else {
    require POSIX;
    s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge;
  }
  $_;
}

=item perl_stringify NAME

A function which returns a 7 bit ASCII correctly \ escaped version of the
string passed suitable for a perl "" string.

=cut

# Hopefully make a happy perl identifier.
sub perl_stringify {
  local $_ = shift;
  return unless defined $_;
  s/\\/\\\\/g;
  s/([\"\'])/\\$1/g;	# Grr. fix perl mode.
  s/\n/\\n/g;		# Ensure newlines don't end up in octal
  s/\r/\\r/g;
  s/\t/\\t/g;
  s/\f/\\f/g;
  s/\a/\\a/g;
  unless (is_perl55) {
    # This will elicit a warning on 5.005_03 about [: :] being reserved unless
    # I cheat
    my $cheat = '([[:^print:]])';
    if (is_sane_perl) {
	if (ord('A') == 193) { # EBCDIC has no ^\0-\177 workalike.
	    s/$cheat/sprintf "\\x{%X}", ord $1/ge;
	} else {
	    s/([^\0-\177])/sprintf "\\x{%X}", ord $1/ge;
	}
    } else {
      # Grr 5.6.1. And I don't think I can use utf8; to force the regexp
      # because 5.005_03 will fail.
      # This is grim, but I also can't split on //
      my $copy;
      foreach my $index (0 .. length ($_) - 1) {
        my $char = substr ($_, $index, 1);
        $copy .= ($char le "\177") ? $char : sprintf "\\x{%X}", ord $char;
      }
      $_ = $copy;
    }
    s/$cheat/sprintf "\\%03o", ord $1/ge;
  } else {
    # Turns out "\x{}" notation only arrived with 5.6
    s/([^\0-\177])/sprintf "\\x%02X", ord $1/ge;
    require POSIX;
    s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge;
  }
  $_;
}

1;
__END__

=back

=head1 AUTHOR

Nicholas Clark <nick@ccl4.org> based on the code in C<h2xs> by Larry Wall and
others

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