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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