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package ExtUtils::Constant::Utils; |
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use strict; |
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use vars qw($VERSION @EXPORT_OK @ISA $is_perl56); |
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use Carp; |
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@ISA = 'Exporter'; |
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@EXPORT_OK = qw(C_stringify perl_stringify); |
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$VERSION = '0.01'; |
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$is_perl56 = ($] < 5.007 && $] > 5.005_50); |
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=head1 NAME |
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ExtUtils::Constant::Utils - helper functions for ExtUtils::Constant |
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=head1 SYNOPSIS |
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use ExtUtils::Constant::Utils qw (C_stringify); |
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$C_code = C_stringify $stuff; |
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=head1 DESCRIPTION |
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ExtUtils::Constant::Utils packages up utility subroutines used by |
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ExtUtils::Constant, ExtUtils::Constant::Base and derived classes. All its |
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functions are explicitly exportable. |
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=head1 USAGE |
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=over 4 |
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=item C_stringify NAME |
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A function which returns a 7 bit ASCII correctly \ escaped version of the |
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string passed suitable for C's "" or ''. It will die if passed Unicode |
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characters. |
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=cut |
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# Hopefully make a happy C identifier. |
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sub C_stringify { |
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local $_ = shift; |
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return unless defined $_; |
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# grr 5.6.1 |
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confess "Wide character in '$_' intended as a C identifier" |
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if tr/\0-\377// != length; |
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# grr 5.6.1 moreso because its regexps will break on data that happens to |
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# be utf8, which includes my 8 bit test cases. |
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$_ = pack 'C*', unpack 'U*', $_ . pack 'U*' if $is_perl56; |
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s/\\/\\\\/g; |
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s/([\"\'])/\\$1/g; # Grr. fix perl mode. |
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s/\n/\\n/g; # Ensure newlines don't end up in octal |
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s/\r/\\r/g; |
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s/\t/\\t/g; |
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s/\f/\\f/g; |
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s/\a/\\a/g; |
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s/([^\0-\177])/sprintf "\\%03o", ord $1/ge; |
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unless ($] < 5.006) { |
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# This will elicit a warning on 5.005_03 about [: :] being reserved unless |
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# I cheat |
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my $cheat = '([[:^print:]])'; |
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s/$cheat/sprintf "\\%03o", ord $1/ge; |
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} else { |
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require POSIX; |
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s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge; |
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} |
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$_; |
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} |
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=item perl_stringify NAME |
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A function which returns a 7 bit ASCII correctly \ escaped version of the |
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string passed suitable for a perl "" string. |
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=cut |
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# Hopefully make a happy perl identifier. |
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sub perl_stringify { |
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local $_ = shift; |
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return unless defined $_; |
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s/\\/\\\\/g; |
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s/([\"\'])/\\$1/g; # Grr. fix perl mode. |
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s/\n/\\n/g; # Ensure newlines don't end up in octal |
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s/\r/\\r/g; |
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s/\t/\\t/g; |
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s/\f/\\f/g; |
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s/\a/\\a/g; |
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unless ($] < 5.006) { |
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if ($] > 5.007) { |
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s/([^\0-\177])/sprintf "\\x{%X}", ord $1/ge; |
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} else { |
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# Grr 5.6.1. And I don't think I can use utf8; to force the regexp |
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# because 5.005_03 will fail. |
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# This is grim, but I also can't split on // |
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my $copy; |
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foreach my $index (0 .. length ($_) - 1) { |
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my $char = substr ($_, $index, 1); |
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$copy .= ($char le "\177") ? $char : sprintf "\\x{%X}", ord $char; |
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} |
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$_ = $copy; |
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} |
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# This will elicit a warning on 5.005_03 about [: :] being reserved unless |
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# I cheat |
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my $cheat = '([[:^print:]])'; |
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s/$cheat/sprintf "\\%03o", ord $1/ge; |
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} else { |
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# Turns out "\x{}" notation only arrived with 5.6 |
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s/([^\0-\177])/sprintf "\\x%02X", ord $1/ge; |
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require POSIX; |
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s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge; |
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} |
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$_; |
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} |
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1; |
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__END__ |
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=back |
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=head1 AUTHOR |
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Nicholas Clark <nick@ccl4.org> based on the code in C<h2xs> by Larry Wall and |
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others |
