X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2Fopen.pm;h=b535d88239a75507a773fb5db1e6546441ffc3f6;hb=9c1370fb202eb56860da11d7695c846c33542694;hp=3a08b797fd242eae355290fd57152c2caf413562;hpb=0c4f7ff0542ecfc72484b0714d25e263611253ee;p=p5sagit%2Fp5-mst-13.2.git diff --git a/lib/open.pm b/lib/open.pm index 3a08b79..b535d88 100644 --- a/lib/open.pm +++ b/lib/open.pm @@ -4,38 +4,109 @@ $open::hint_bits = 0x20000; our $VERSION = '1.01'; +my $locale_encoding; + +sub in_locale { $^H & $locale::hint_bits } + +sub _get_locale_encoding { + unless (defined $locale_encoding) { + # I18N::Langinfo isn't available everywhere + eval { + require I18N::Langinfo; + I18N::Langinfo->import(qw(langinfo CODESET)); + $locale_encoding = langinfo(CODESET()); + }; + unless ($@) { + print "# locale_encoding = $locale_encoding\n"; + } + my $country_language; + if (not $locale_encoding && in_locale()) { + if ($ENV{LC_ALL} =~ /^([^.]+)\.([^.]+)$/) { + ($country_language, $locale_encoding) = ($1, $2); + } elsif ($ENV{LANG} =~ /^([^.]+)\.([^.]+)$/) { + ($country_language, $locale_encoding) = ($1, $2); + } + } elsif (not $locale_encoding) { + if ($ENV{LC_ALL} =~ /\butf-?8\b/i || + $ENV{LANG} =~ /\butf-?8\b/i) { + $locale_encoding = 'utf8'; + } + # Could do more heuristics based on the country and language + # parts of LC_ALL and LANG (the parts before the dot (if any)), + # since we have Locale::Country and Locale::Language available. + # TODO: get a database of Language -> Encoding mappings + # (the Estonian database at http://www.eki.ee/letter/ + # would be excellent!) --jhi + } + if (defined $locale_encoding && + $locale_encoding eq 'euc' && + defined $country_language) { + if ($country_language =~ /^ja_JP|japan(?:ese)?$/i) { + $locale_encoding = 'euc-jp'; + } elsif ($country_language =~ /^ko_KR|korean?$/i) { + $locale_encoding = 'euc-kr'; + } elsif ($country_language =~ /^zh_TW|taiwan(?:ese)?$/i) { + $locale_encoding = 'euc-tw'; + } + croak "Locale encoding 'euc' too ambiguous" + if $locale_encoding eq 'euc'; + } + } +} + sub import { my ($class,@args) = @_; croak("`use open' needs explicit list of disciplines") unless @args; $^H |= $open::hint_bits; - my ($in,$out) = split(/\0/,(${^OPEN} || '\0')); - my @in = split(/\s+/,$in); - my @out = split(/\s+/,$out); + my ($in,$out) = split(/\0/,(${^OPEN} || "\0"), -1); while (@args) { my $type = shift(@args); - my $discp = shift(@args); + my $dscp; + if ($type =~ /^:?(utf8|locale|encoding\(.+\))$/) { + $type = 'IO'; + $dscp = ":$1"; + } else { + $dscp = shift(@args) || ''; + } my @val; - foreach my $layer (split(/\s+/,$discp)) { + foreach my $layer (split(/\s+/,$dscp)) { $layer =~ s/^://; - unless(PerlIO::Layer::->find($layer)) { - carp("Unknown discipline layer '$layer'"); + if ($layer eq 'locale') { + use Encode; + _get_locale_encoding() + unless defined $locale_encoding; + croak "Cannot figure out an encoding to use" + unless defined $locale_encoding; + if ($locale_encoding =~ /^utf-?8$/i) { + $layer = "utf8"; + } else { + $layer = "encoding($locale_encoding)"; + } + } else { + unless(PerlIO::Layer::->find($layer)) { + carp("Unknown discipline layer '$layer'"); + } } push(@val,":$layer"); if ($layer =~ /^(crlf|raw)$/) { $^H{"open_$type"} = $layer; } } + # print "# type = $type, val = @val\n"; if ($type eq 'IN') { $in = join(' ',@val); } elsif ($type eq 'OUT') { $out = join(' ',@val); } + elsif ($type eq 'IO') { + $in = $out = join(' ',@val); + } else { croak "Unknown discipline class '$type'"; } } - ${^OPEN} = join('\0',$in,$out); + ${^OPEN} = join("\0",$in,$out); } 1; @@ -47,7 +118,15 @@ open - perl pragma to set default disciplines for input and output =head1 SYNOPSIS - use open IN => ":crlf", OUT => ":raw"; + use open IN => ":crlf", OUT => ":raw"; + use open OUT => ':utf8'; + use open IO => ":encoding(iso-8859-7)"; + + use open IO => ':locale'; + + use open ':utf8'; + use open ':locale'; + use open ':encoding(iso-8859-7)'; =head1 DESCRIPTION @@ -63,6 +142,42 @@ I/O operations. Any open(), readpipe() (aka qx//) and similar operators found within the lexical scope of this pragma will use the declared defaults. +With the C subpragma you can declare the default layers +of input streams, and with the C subpragma you can declare +the default layers of output streams. With the C subpragma +you can control both input and output streams simultaneously. + +If you have a legacy encoding, you can use the C<:encoding(...)> tag. + +if you want to set your encoding disciplines based on your +locale environment variables, you can use the C<:locale> tag. +For example: + + $ENV{LANG} = 'ru_RU.KOI8-R'; + # the :locale will probe the locale environment variables like LANG + use open OUT => ':locale'; + open(O, ">koi8"); + print O chr(0x430); # Unicode CYRILLIC SMALL LETTER A = KOI8-R 0xc1 + close O; + open(I, "), "\n"; # this should print 0xc1 + close I; + +These are equivalent + + use open ':utf8'; + use open IO => ':utf8'; + +as are these + + use open ':locale'; + use open IO => ':locale'; + +and these + + use open ':encoding(iso-8859-7)'; + use open IO => ':encoding(iso-8859-7)'; + When open() is given an explicit list of layers they are appended to the list declared using this pragma. @@ -82,17 +197,20 @@ everywhere if PerlIO is enabled. =head1 IMPLEMENTATION DETAILS -There is a class method in C C which is implemented as XS code. -It is called by C to validate the layers: +There is a class method in C C which is +implemented as XS code. It is called by C to validate the +layers: PerlIO::Layer::->find("perlio") -The return value (if defined) is a Perl object, of class C which is -created by the C code in F. As yet there is nothing useful you can do with the -object at the perl level. +The return value (if defined) is a Perl object, of class +C which is created by the C code in F. As +yet there is nothing useful you can do with the object at the perl +level. =head1 SEE ALSO -L, L, L, L +L, L, L, L, +L =cut