home *** CD-ROM | disk | FTP | other *** search
- package ExtUtils::Constant::Utils;
-
- use strict;
- use vars qw($VERSION @EXPORT_OK @ISA $is_perl56);
- use Carp;
-
- @ISA = 'Exporter';
- @EXPORT_OK = qw(C_stringify perl_stringify);
- $VERSION = '0.01';
-
- $is_perl56 = ($] < 5.007 && $] > 5.005_50);
-
- =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;
- s/([^\0-\177])/sprintf "\\%03o", ord $1/ge;
- unless ($] < 5.006) {
- # This will elicit a warning on 5.005_03 about [: :] being reserved unless
- # I cheat
- my $cheat = '([[:^print:]])';
- s/$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 ($] < 5.006) {
- if ($] > 5.007) {
- 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;
- }
- # This will elicit a warning on 5.005_03 about [: :] being reserved unless
- # I cheat
- my $cheat = '([[:^print:]])';
- s/$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
-