Char::UTF2 - Source code filter to escape UTF-2
use Char::UTF2; use Char::UTF2 version; --- require version use Char::UTF2 qw(ord reverse); --- demand enhanced feature of ord and reverse use Char::UTF2 version qw(ord reverse); # "no Char::UTF2;" not supported or $ perl Char/UTF2.pm UTF-2_script.pl > Escaped_script.pl.e then $ perl Escaped_script.pl.e UTF-2_script.pl --- script written in UTF-2 Escaped_script.pl.e --- escaped script functions: Char::UTF2::ord(...); Char::UTF2::reverse(...); Char::UTF2::length(...); Char::UTF2::substr(...); Char::UTF2::index(...); Char::UTF2::rindex(...); emulate Perl5.6 on perl5.00503 use warnings; use warnings::register; binmode(...); open(...); dummy functions: utf8::upgrade(...); utf8::downgrade(...); utf8::encode(...); utf8::decode(...); utf8::is_utf8(...); utf8::valid(...); bytes::chr(...); bytes::index(...); bytes::length(...); bytes::ord(...); bytes::rindex(...); bytes::substr(...);
Let's start with a bit of history: jperl 4.019+1.3 introduced UTF-2 support. You could apply chop() and regexps even to complex CJK characters.
JPerl in CPAN Perl Ports (Binary Distributions)
said before,
As of Perl 5.8.0 it is suggested that instead of JPerl (which is based on a quite old release of Perl) you should just use Perl 5.8.0, since it can do all that JPerl did, and more.
But was it really so?
In this country, UTF-2 is widely used on mainframe I/O, the personal computer, and the cellular phone. This software treats UTF-2 directly. Therefor there is not UTF8 flag.
A difficult solution makes the problem more difficult. Shall we escape from the encode problem?
JPerl is very useful software. -- Oops, note, this "JPerl" means Japanized or Japanese Perl, so is unrelated to Java and JVM. Therefore, I named this software better, fitter Char::UTF2.
Now, the last version of JPerl is 5.005_04 and is not maintained now.
Japanization modifier WATANABE Hirofumi said,
"Because WATANABE am tired I give over maintaing JPerl."
at Slide #15: "The future of JPerl" of
ftp://ftp.oreilly.co.jp/pcjp98/watanabe/jperlconf.ppt
in The Perl Confernce Japan 1998.
When I heard it, I thought that someone excluding me would maintain JPerl. And I slept every night hanging a sock. Night and day, I kept having hope. After 10 years, I noticed that white beard exists in the sock :-)
This software is a source code filter to escape Perl script encoded by UTF-2 given from STDIN or command line parameter. The character code is never converted by escaping the script. Neither the value of the character nor the length of the character string change even if it escapes.
What's this software good for ...
Possible to handle raw UTF-2 values
Backward compatibility of data, script and how to
Only Char/UTF2.pm and Char/Eutf2.pm, other modules are unnecessary
No UTF8 flag, perlunitut and perluniadvice
No C programming (for maintain JPerl)
Independent from binary file (CPU, OS, perl version, 32bit/64bit)
Let's make yet another future by JPerl's future.
+---------------------------------------+ | JPerl Application Script | Your Script +---------------------------------------+ | Source Code Filter, Runtime Routine | ex. Char/UTF2.pm, Char/Eutf2.pm +---------------------------------------+ | PVM 5.00503 or later | ex. perl 5.00503 +---------------------------------------+
A Perl Virtual Machine (PVM) enables a set of computer software programs and data structures to use a virtual machine model for the execution of other computer programs and scripts. The model used by a PVM accepts a form of computer intermediate language commonly referred to as Perl byteorientedcode. This language conceptually represents the instruction set of a byte-oriented, capability architecture.
I discovered this mail again recently.
[Tokyo.pm] jus Benkyoukai
http://mail.pm.org/pipermail/tokyo-pm/1999-September/001854.html
save as: SJIS.pm
package SJIS; use Filter::Util::Call; sub multibyte_filter { my $status; if (($status = filter_read()) > 0 ) { s/([\x81-\x9f\xe0-\xef])([\x40-\x7e\x80-\xfc])/ sprintf("\\x%02x\\x%02x",ord($1),ord($2)) /eg; } $status; } sub import { filter_add(\&multibyte_filter); } 1;
I am glad that I could confirm my idea is not so wrong.
Char/UTF2.pm --- source code filter to escape UTF-2 Char/Eutf2.pm --- run-time routines for Char/UTF2.pm perl55.bat --- find and run perl5.5 without %PATH% settings perl56.bat --- find and run perl5.6 without %PATH% settings perl58.bat --- find and run perl5.8 without %PATH% settings perl510.bat --- find and run perl5.10 without %PATH% settings perl512.bat --- find and run perl5.12 without %PATH% settings perl514.bat --- find and run perl5.14 without %PATH% settings perl64.bat --- find and run perl64 without %PATH% settings strict.pm_ --- dummy strict.pm warnings.pm_ --- poor warnings.pm warnings/register.pm_ --- poor warnings/register.pm Rename and install strict.pm_ of this distribution to strict.pm if your system doesn't have strict.pm.
This software adds the function by 'Escaping' it always, and nothing of the past is broken. Therefore, 'Possible job' never becomes 'Impossible job'. This approach is effective in the field where the retreat is never permitted. Modern Perl/perl can not always solve the problem.
You need write 'use Char::UTF2;' in your script.
--------------------------------- Before After --------------------------------- (nothing) use Char::UTF2; ---------------------------------
Insert chr(0x5c) before @ [ \ ] ^ ` { | and } in multiple octet of
string in single quote ('', q{}, <<'END' and qw{})
string in double quote ("", qq{}, <<END, <<"END", ``, qx{} and <<`END`)
regexp in single quote (m'', s''', split(''), split(m'') and qr'')
regexp in double quote (//, m//, ??, s///, split(//), split(m//) and qr//)
character in tr/// (tr/// and y///)
ex. Japanese Katakana "SO" like [ `/ ] code is "\x83\x5C" in SJIS see hex dump ----------------------------------------- source script "`/" [83 5c] ----------------------------------------- Here, use SJIS; hex dump ----------------------------------------- escaped script "`\/" [83 [5c] 5c] ----------------------------------------- ^--- escape by SJIS software by the by see hex dump ----------------------------------------- your eye's "`/\" [83 5c] [5c] ----------------------------------------- perl eye's "`\/" [83] \[5c] ----------------------------------------- hex dump ----------------------------------------- in the perl "`/" [83] [5c] -----------------------------------------
The character classes are redefined as follows to backward compatibility.
--------------------------------------------------------------------------- Before After --------------------------------------------------------------------------- . (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[^\x0A]) (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[\x00-\xFF]) (/s modifier) \d [0-9] \s [\x09\x0A\x0C\x0D\x20] \w [0-9A-Z_a-z] \D (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[^0-9]) \S (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[^\x09\x0A\x0C\x0D\x20]) \W (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[^0-9A-Z_a-z]) \h [\x09\x20] \v [\x0C\x0A\x0D] \H (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[^\x09\x20]) \V (?:(?:[\xC2-\xDF]|[\xE0-\xE0][\xA0-\xBF]|[\xE1-\xEC][\x80-\xBF]|[\xED-\xED][\x80-\x9F]|[\xEE-\xEF][\x80-\xBF]|[\xF0-\xF0][\x90-\xBF][\x80-\xBF]|[\xF1-\xF3][\x80-\xBF][\x80-\xBF]|[\xF4-\xF4][\x80-\x8F][\x80-\xBF])[\x00-\xFF]|[^\x0C\x0A\x0D]) ---------------------------------------------------------------------------
Also \b and \B are redefined as follows to backward compatibility.
--------------------------------------------------------------------------- Before After --------------------------------------------------------------------------- \b (?:\A(?=[0-9A-Z_a-z])|(?<=[\x00-\x2F\x40\x5B-\x5E\x60\x7B-\xFF])(?=[0-9A-Z_a-z])|(?<=[0-9A-Z_a-z])(?=[\x00-\x2F\x40\x5B-\x5E\x60\x7B-\xFF]|\z)) \B (?:(?<=[0-9A-Z_a-z])(?=[0-9A-Z_a-z])|(?<=[\x00-\x2F\x40\x5B-\x5E\x60\x7B-\xFF])(?=[\x00-\x2F\x40\x5B-\x5E\x60\x7B-\xFF])) ---------------------------------------------------------------------------
Insert 'Char::Eutf2::' at head of function name. Char/Eutf2.pm provides your script Char::Eutf2::* functions.
--------------------------------- Before After --------------------------------- length length substr substr pos pos split Char::Eutf2::split tr/// Char::Eutf2::tr tr///b tr/// tr///B tr/// y/// Char::Eutf2::tr y///b tr/// y///B tr/// chop Char::Eutf2::chop chr Char::Eutf2::chr glob Char::Eutf2::glob --------------------------------- ------------------------------------------------------------------------------------------------------------------------ Before After ------------------------------------------------------------------------------------------------------------------------ use Perl::Module; BEGIN { require 'Perl/Module.pm'; Perl::Module->import() if Perl::Module->can('import'); } use Perl::Module @list; BEGIN { require 'Perl/Module.pm'; Perl::Module->import(@list) if Perl::Module->can('import'); } use Perl::Module (); BEGIN { require 'Perl/Module.pm'; } no Perl::Module; BEGIN { require 'Perl/Module.pm'; Perl::Module->unimport() if Perl::Module->can('unimport'); } no Perl::Module @list; BEGIN { require 'Perl/Module.pm'; Perl::Module->unimport(@list) if Perl::Module->can('unimport'); } no Perl::Module (); BEGIN { require 'Perl/Module.pm'; } ------------------------------------------------------------------------------------------------------------------------
Char/UTF2.pm remove 'bytes::' at head of function name.
------------------------------------ Before After ------------------------------------ bytes::chr chr bytes::index index bytes::length length bytes::ord ord bytes::rindex rindex bytes::substr substr ------------------------------------
Char/Eutf2.pm does "BEGIN { unshift @INC, '/Perl/site/lib/Char::UTF2' }" at head. Store the standard module modified for Char::UTF2 software in this directory to override built-in standard modules.
You need copy built-in standard module to /Perl/site/lib/Char::UTF2 and change 'use utf8;' to 'use Char::UTF2;' in its. You need help yourself for now.
Back to and see 'Escaping Your Script'. Enjoy hacking!!
You need write 'Char::UTF2::' at head of function name when you want character oriented function. See 'CHARACTER ORIENTED FUNCTIONS'.
--------------------------------- Before After --------------------------------- ord Char::UTF2::ord reverse Char::UTF2::reverse length Char::UTF2::length substr Char::UTF2::substr index Char::UTF2::index rindex Char::UTF2::rindex ---------------------------------
Order Of Character
$ord = Char::UTF2::ord($string); This function returns the numeric value (ASCII or UTF-2) of the first character of $string. The return value is always unsigned.
Reverse List Or String
@reverse = Char::UTF2::reverse(@list); $reverse = Char::UTF2::reverse(@list); In list context, this function returns a list value consisting of the elements of @list in the opposite order. The function can be used to create descending sequences: for (Char::UTF2::reverse(1 .. 10)) { ... } Because of the way hashes flatten into lists when passed as a @list, reverse can also be used to invert a hash, presuming the values are unique: %barfoo = Char::UTF2::reverse(%foobar); In scalar context, the function concatenates all the elements of LIST and then returns the reverse of that resulting string, character by character.
Length By UTF-2 Character
$length = Char::UTF2::length($string); $length = Char::UTF2::length(); This function returns the length in characters of the scalar value $string. If $string is omitted, it returns the Char::UTF2::length of $_. Do not try to use length to find the size of an array or hash. Use scalar @array for the size of an array, and scalar keys %hash for the number of key/value pairs in a hash. (The scalar is typically omitted when redundant.) To find the length of a string in bytes rather than characters, say simply: $bytes = length($string);
Substr By UTF-2 Character
$substr = Char::UTF2::substr($string,$offset,$length,$replacement); $substr = Char::UTF2::substr($string,$offset,$length); $substr = Char::UTF2::substr($string,$offset); This function extracts a substring out of the string given by $string and returns it. The substring is extracted starting at $offset characters from the front of the string. If $offset is negative, the substring starts that far from the end of the string instead. If $length is omitted, everything to the end of the string is returned. If $length is negative, the length is calculated to leave that many characters off the end of the string. Otherwise, $length indicates the length of the substring to extract, which is sort of what you'd expect. An alternative to using Char::UTF2::substr as an lvalue is to specify the $replacement string as the fourth argument. This allows you to replace parts of the $string and return what was there before in one operation, just as you can with splice. The next example also replaces the last character of $var with "Curly" and puts that replaced character into $oldstr: $oldstr = Char::UTF2::substr($var, -1, 1, "Curly"); If you assign something shorter than the length of your substring, the string will shrink, and if you assign something longer than the length, the string will grow to accommodate it. To keep the string the same length, you may need to pad or chop your value using sprintf or the x operator. If you attempt to assign to an unallocated area past the end of the string, Char::UTF2::substr raises an exception. To prepend the string "Larry" to the current value of $_, use: Char::UTF2::substr($var, 0, 0, "Larry"); To instead replace the first character of $_ with "Moe", use: Char::UTF2::substr($var, 0, 1, "Moe"); And finally, to replace the last character of $var with "Curly", use: Char::UTF2::substr($var, -1, 1, "Curly");
Index By UTF-2 Character
$index = Char::UTF2::index($string,$substring,$offset); $index = Char::UTF2::index($string,$substring); This function searches for one string within another. It returns the position of the first occurrence of $substring in $string. The $offset, if specified, says how many characters from the start to skip before beginning to look. Positions are based at 0. If the substring is not found, the function returns one less than the base, ordinarily -1. To work your way through a string, you might say: $pos = -1; while (($pos = Char::UTF2::index($string, $lookfor, $pos)) > -1) { print "Found at $pos\n"; $pos++; }
Rindex By UTF-2 Character
$rindex = Char::UTF2::rindex($string,$substring,$position); $rindex = Char::UTF2::rindex($string,$substring); This function works just like Char::UTF2::index except that it returns the position of the last occurrence of $substring in $string (a reverse index). The function returns -1 if not $substring is found. $position, if specified, is the rightmost position that may be returned. To work your way through a string backward, say: $pos = Char::UTF2::length($string); while (($pos = Char::UTF2::rindex($string, $lookfor, $pos)) >= 0) { print "Found at $pos\n"; $pos--; }
Using warnings pragma on perl5.00503 by rename files. warnings.pm_ --> warnings.pm warnings/register.pm_ --> warnings/register.pm To be compatible with Perl5.6 on perl5.005, script is converted as follows. -------------------------------------------------------------------- Before After in BEGIN { } of Char/Eutf2.pm -------------------------------------------------------------------- binmode(...); Char::Eutf2::binmode(...); *CORE::GLOBAL::binmode = ... open(...); Char::Eutf2::open(...); *CORE::GLOBAL::open = ... --------------------------------------------------------------------
binmode (Perl5.6 emulation on perl5.005)
binmode(FILEHANDLE, $disciplines); binmode(FILEHANDLE); binmode($filehandle, $disciplines); binmode($filehandle); * two arguments If you are using perl5.005 other than MacPerl, Char::UTF2 software emulate perl5.6's binmode function. Only the point is here. See also perlfunc/binmode for details. This function arranges for the FILEHANDLE to have the semantics specified by the $disciplines argument. If $disciplines is omitted, ':raw' semantics are applied to the filehandle. If FILEHANDLE is an expression, the value is taken as the name of the filehandle or a reference to a filehandle, as appropriate. The binmode function should be called after the open but before any I/O is done on the filehandle. The only way to reset the mode on a filehandle is to reopen the file, since the various disciplines may have treasured up various bits and pieces of data in various buffers. The ":raw" discipline tells Perl to keep its cotton-pickin' hands off the data. For more on how disciplines work, see the open function.
open (Perl5.6 emulation on perl5.005)
open(FILEHANDLE, $mode, $expr); open(FILEHANDLE, $expr); open(FILEHANDLE); open(my $filehandle, $mode, $expr); open(my $filehandle, $expr); open(my $filehandle); * autovivification filehandle * three arguments If you are using perl5.005, Char::UTF2 software emulate perl5.6's open function. Only the point is here. See also perlfunc/open for details. As that example shows, the FILEHANDLE argument is often just a simple identifier (normally uppercase), but it may also be an expression whose value provides a reference to the actual filehandle. (The reference may be either a symbolic reference to the filehandle name or a hard reference to any object that can be interpreted as a filehandle.) This is called an indirect filehandle, and any function that takes a FILEHANDLE as its first argument can handle indirect filehandles as well as direct ones. But open is special in that if you supply it with an undefined variable for the indirect filehandle, Perl will automatically define that variable for you, that is, autovivifying it to contain a proper filehandle reference. { my $fh; # (uninitialized) open($fh, ">logfile") # $fh is autovivified or die "Can't create logfile: $!"; ... # do stuff with $fh } # $fh closed here The my $fh declaration can be readably incorporated into the open: open my $fh, ">logfile" or die ... The > symbol you've been seeing in front of the filename is an example of a mode. Historically, the two-argument form of open came first. The recent addition of the three-argument form lets you separate the mode from the filename, which has the advantage of avoiding any possible confusion between the two. In the following example, we know that the user is not trying to open a filename that happens to start with ">". We can be sure that they're specifying a $mode of ">", which opens the file named in $expr for writing, creating the file if it doesn't exist and truncating the file down to nothing if it already exists: open(LOG, ">", "logfile") or die "Can't create logfile: $!"; With the one- or two-argument form of open, you have to be careful when you use a string variable as a filename, since the variable may contain arbitrarily weird characters (particularly when the filename has been supplied by arbitrarily weird characters on the Internet). If you're not careful, parts of the filename might get interpreted as a $mode string, ignorable whitespace, a dup specification, or a minus. Here's one historically interesting way to insulate yourself: $path =~ s#^([ ])#./$1#; open (FH, "< $path\0") or die "can't open $path: $!"; But that's still broken in several ways. Instead, just use the three-argument form of open to open any arbitrary filename cleanly and without any (extra) security risks: open(FH, "<", $path) or die "can't open $path: $!"; As of the 5.6 release of Perl, you can specify binary mode in the open function without a separate call to binmode. As part of the $mode argument (but only in the three-argument form), you may specify various input and output disciplines. To do the equivalent of a binmode, use the three argument form of open and stuff a discipline of :raw in after the other $mode characters: open(FH, "<:raw", $path) or die "can't open $path: $!"; Table 1. I/O Disciplines ------------------------------------------------- Discipline Meaning ------------------------------------------------- :raw Binary mode; do no processing :crlf Text mode; Intuit newlines (DOS-like system only) :encoding(...) Legacy encoding ------------------------------------------------- You'll be able to stack disciplines that make sense to stack, so, for instance, you could say: open(FH, "<:crlf:encoding(Char::UTF2)", $path) or die "can't open $path: $!";
----------------------------------------------------------- Before After ----------------------------------------------------------- use strict; use strict; no strict qw(refs); require utf8; # require utf8; require bytes; # require bytes; require I18N::Japanese; # require I18N::Japanese; require I18N::Collate; # require I18N::Collate; require I18N::JExt; # require I18N::JExt; require File::DosGlob; # require File::DosGlob; require Wild; # require Wild; require Wildcard; # require Wildcard; require Japanese; # require Japanese; use utf8; # use utf8; use bytes; # use bytes; use I18N::Japanese; # use I18N::Japanese; use I18N::Collate; # use I18N::Collate; use I18N::JExt; # use I18N::JExt; use File::DosGlob; # use File::DosGlob; use Wild; # use Wild; use Wildcard; # use Wildcard; use Japanese; # use Japanese; no utf8; # no utf8; no bytes; # no bytes; no I18N::Japanese; # no I18N::Japanese; no I18N::Collate; # no I18N::Collate; no I18N::JExt; # no I18N::JExt; no File::DosGlob; # no File::DosGlob; no Wild; # no Wild; no Wildcard; # no Wildcard; no Japanese; # no Japanese; ----------------------------------------------------------- Comment out pragma to ignore utf8 environment, and Char/Eutf2.pm provides these functions.
Dummy utf8::upgrade
$num_octets = utf8::upgrade($string); Returns the number of octets necessary to represent the string.
Dummy utf8::downgrade
$success = utf8::downgrade($string[, FAIL_OK]); Returns true always.
Dummy utf8::encode
utf8::encode($string); Returns nothing.
Dummy utf8::decode
$success = utf8::decode($string); Returns true always.
Dummy utf8::is_utf8
$flag = utf8::is_utf8(STRING); Returns false always.
Dummy utf8::valid
$flag = utf8::valid(STRING); Returns true always.
Dummy bytes::chr
This function is same as chr.
Dummy bytes::index
This function is same as index.
Dummy bytes::length
This function is same as length.
Dummy bytes::ord
This function is same as ord.
Dummy bytes::rindex
This function is same as rindex.
Dummy bytes::substr
This function is same as substr.
This software uses the flock function for exclusive control. The execution of the program is blocked until it becomes possible to read or write the file. You can have it not block in the flock function by defining environment variable SJIS_NONBLOCK. Example: SET SJIS_NONBLOCK=1 (The value '1' doesn't have the meaning)
Please patches and report problems to author are welcome.
format
Function "format" can't handle multiple octet code same as original Perl.
Char::UTF2::substr As Lvalue
Char::UTF2::substr differs from CORE::substr, and cannot be used as a lvalue. To change part of a string, you can use the optional fourth argument which is the replacement string.
Char::UTF2::substr($string, 13, 4, "JPerl");
INABA Hitoshi <ina@cpan.org>
This project was originated by INABA Hitoshi.
This software is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.
This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
P.401 See chapter 15: Unicode of ISBN 0-596-00027-8 Programming Perl Third Edition.
Before the introduction of Unicode support in perl, The eq operator just compared the byte-strings represented by two scalars. Beginning with perl 5.8, eq compares two byte-strings with simultaneous consideration of the UTF8 flag.
Information processing model beginning with perl 5.8 +----------------------+---------------------+ | Text strings | | +----------+-----------| Binary strings | | UTF8 | Latin-1 | | +----------+-----------+---------------------+ | UTF8 | Not UTF8 | | Flagged | Flagged | +--------------------------------------------+ http://perl-users.jp/articles/advent-calendar/2010/casual/4 You should memorize this figure. (Why is only Latin-1 special?)
This change consequentially made a big gap between a past script and new script. Both scripts cannot re-use the code mutually any longer. Because a new method puts a strain in the programmer, it will still take time to replace all the in existence scripts.
The biggest problem of new method is that the UTF8 flag can't synchronize to real encode of string. Thus you must debug about UTF8 flag, before your script. How to solve it by returning to a past method, I will quote page 402 of Programming Perl, 3rd ed. again.
Information processing model beginning with this software +-----------------------------------+ | Octet Strings | aka Binary strings +-----------------------------------+ | Character Strings | aka Text strings +-----------------------------------+ | ASCII Compatible Encoding | ex. UTF-2 +-----------------------------------+ (No UTF8 Flag) You need not memorize this figure.
Ideally, I'd like to achieve these five Goals:
Goal #1:
Old byte-oriented programs should not spontaneously break on the old byte-oriented data they used to work on.
It has already been achieved by UTF-2 designed for combining with old byte-oriented ASCII.
Goal #2:
Old byte-oriented programs should magically start working on the new character-oriented data when appropriate.
Still now, 1 octet is counted with 1 by embedded functions length, substr, index, rindex and pos that handle length and position of string. In this part, there is no change. The length of 1 character of 2 octet code is 2.
On the other hand, the regular expression in the script is added the multibyte anchoring processing with this software, instead of you.
figure of Goal #1 and Goal #2.
GOAL#1 GOAL#2 (a) (b) (c) (d) (e) +--------------+-------+-------+-------+-------+-------+ | data | Old | Old | New | Old | New | +--------------+-------+-------+-------+-------+-------+ | script | Old | Old | New | +--------------+-------+---------------+---------------+ | interpreter | Old | New | +--------------+-------+-------------------------------+ Old --- Old byte-oriented New --- New character-oriented
There is a combination from (a) to (e) in data, script and interpreter of old and new. Let's add the Encode module and this software did not exist at time of be written this document and JPerl did exist.
(a) (b) (c) (d) (e) JPerl Encode,Char::UTF2 +--------------+-------+-------+-------+-------+-------+ | data | Old | Old | New | Old | New | +--------------+-------+-------+-------+-------+-------+ | script | Old | Old | New | +--------------+-------+---------------+---------------+ | interpreter | Old | New | +--------------+-------+-------------------------------+ Old --- Old byte-oriented New --- New character-oriented
The reason why JPerl is very excellent is that it is at the position of (c). That is, it is not necessary to do a special description to the script to process new character-oriented string.
Contrasting is Encode module and describing "use Char::UTF2;" on this software, in this case, a new description is necessary.
Goal #3:
Programs should run just as fast in the new character-oriented mode as in the old byte-oriented mode.
It is impossible. Because the following time is necessary.
(1) Time of escape script for old byte-oriented perl.
Goal #4:
Perl should remain one language, rather than forking into a byte-oriented Perl and a character-oriented Perl.
JPerl forked the perl interpreter so as not to fork the Perl language. But the Perl core team might not hope for the perl interpreter's fork. As a result, the Perl language forked, and the community was reduced through necessity.
A character-oriented perl is not necessary to make it specially, because a byte-oriented perl can already treat the binary data. This software is only an application program of Perl, a filter program. If perl can be executed, this software will be able to be executed.
And you will get support from the Perl community, when you solve the problem by the Perl script.
Goal #5:
JPerl users will be able to maintain JPerl by Perl.
May the JPerl be with you, always.
Back when Programming Perl, 3rd ed. was written, UTF8 flag was not born and Perl is designed to make the easy jobs easy. This software provide programming environment like at that time.
Programming Perl, Second Edition By Larry Wall, Tom Christiansen, Randal L. Schwartz January 1900 (really so?) Pages: 670 ISBN 10: 1-56592-149-6 | ISBN 13: 9781565921498 http://oreilly.com/catalog/9781565921498/ Programming Perl, Third Edition By Larry Wall, Tom Christiansen, Jon Orwant Third Edition July 2000 Pages: 1104 ISBN 10: 0-596-00027-8 | ISBN 13:9780596000271 http://www.oreilly.com/catalog/pperl3/index.html Perl Cookbook, Second Edition By Tom Christiansen, Nathan Torkington Second Edition August 2003 Pages: 964 ISBN 10: 0-596-00313-7 | ISBN 13: 9780596003135 http://oreilly.com/catalog/9780596003135/index.html Perl in a Nutshell, Second Edition By Stephen Spainhour, Ellen Siever, Nathan Patwardhan Second Edition June 2002 Pages: 760 Series: In a Nutshell ISBN 10: 0-596-00241-6 | ISBN 13: 9780596002411 http://oreilly.com/catalog/9780596002411/index.html Learning Perl on Win32 Systems By Randal L. Schwartz, Erik Olson, Tom Christiansen August 1997 Pages: 306 ISBN 10: 1-56592-324-3 | ISBN 13: 9781565923249 http://oreilly.com/catalog/9781565923249/ Learning Perl, Fifth Edition By Randal L. Schwartz, Tom Phoenix, brian d foy June 2008 Pages: 352 Print ISBN:978-0-596-52010-6 | ISBN 10: 0-596-52010-7 Ebook ISBN:978-0-596-10316-3 | ISBN 10: 0-596-10316-6 http://oreilly.com/catalog/9780596520113/ Perl RESOURCE KIT UNIX EDITION Futato, Irving, Jepson, Patwardhan, Siever ISBN 10: 1-56592-370-7 Understanding Japanese Information Processing By Ken Lunde January 1900 Pages: 470 ISBN 10: 1-56592-043-0 | ISBN 13: 9781565920439 http://oreilly.com/catalog/9781565920439/ CJKV Information Processing Chinese, Japanese, Korean & Vietnamese Computing By Ken Lunde First Edition January 1999 Pages: 1128 ISBN 10: 1-56592-224-7 | ISBN 13:9781565922242 http://www.oreilly.com/catalog/cjkvinfo/index.html ISBN 4-87311-108-0 http://www.oreilly.co.jp/books/4873111080/ Mastering Regular Expressions, Second Edition By Jeffrey E. F. Friedl Second Edition July 2002 Pages: 484 ISBN 10: 0-596-00289-0 | ISBN 13: 9780596002893 http://oreilly.com/catalog/9780596002893/index.html Mastering Regular Expressions, Third Edition By Jeffrey E. F. Friedl Third Edition August 2006 Pages: 542 ISBN 10: 0-596-52812-4 | ISBN 13:9780596528126 http://www.oreilly.com/catalog/regex3/index.html ISBN 978-4-87311-359-3 http://www.oreilly.co.jp/books/9784873113593/ Regular Expressions Cookbook By Jan Goyvaerts, Steven Levithan May 2009 Pages: 512 ISBN 10:0-596-52068-9 | ISBN 13: 978-0-596-52068-7 http://oreilly.com/catalog/9780596520694/ PERL PUROGURAMINGU Larry Wall, Randal L.Schwartz, Yoshiyuki Kondo December 1997 ISBN 4-89052-384-7 http://www.context.co.jp/~cond/books/old-books.html JIS KANJI JITEN Kouji Shibano Pages: 1456 ISBN 4-542-20129-5 http://www.webstore.jsa.or.jp/lib/lib.asp?fn=/manual/mnl01_12.htm UNIX MAGAZINE 1993 Aug Pages: 172 T1008901080816 ZASSHI 08901-8 http://ascii.asciimw.jp/books/magazines/unix.shtml MacPerl Power and Ease By Vicki Brown, Chris Nandor April 1998 Pages: 350 ISBN 10: 1881957322 | ISBN 13: 978-1881957324 http://www.amazon.com/Macperl-Power-Ease-Vicki-Brown/dp/1881957322 Other Tools http://search.cpan.org/dist/jacode/ http://search.cpan.org/dist/Char/ BackPAN http://backpan.perl.org/authors/id/I/IN/INA/
This software was made referring to software and the document that the following hackers or persons had made. I am thankful to all persons.
Rick Yamashita, Shift_JIS ttp://furukawablog.spaces.live.com/Blog/cns!1pmWgsL289nm7Shn7cS0jHzA!2225.entry (dead link) ttp://shino.tumblr.com/post/116166805/1981-us-jis (add 'h' at head) http://www.wdic.org/w/WDIC/%E3%82%B7%E3%83%95%E3%83%88JIS Larry Wall, Perl http://www.perl.org/ Kazumasa Utashiro, jcode.pl ftp://ftp.iij.ad.jp/pub/IIJ/dist/utashiro/perl/ Jeffrey E. F. Friedl, Mastering Regular Expressions http://www.oreilly.com/catalog/regex/index.html SADAHIRO Tomoyuki, The right way of using Shift_JIS http://homepage1.nifty.com/nomenclator/perl/shiftjis.htm Yukihiro "Matz" Matsumoto, YAPC::Asia2006 Ruby on Perl(s) http://www.rubyist.net/~matz/slides/yapc2006/ jscripter, For jperl users http://homepage1.nifty.com/kazuf/jperl.html Bruce., Unicode in Perl http://www.rakunet.org/tsnet/TSabc/18/546.html Hiroaki Izumi, Perl5.8/Perl5.10 is not useful on the Windows. http://www.aritia.org/hizumi/perl/perlwin.html TSUKAMOTO Makio, Perl memo/file path of Windows http://digit.que.ne.jp/work/wiki.cgi?Perl%E3%83%A1%E3%83%A2%2FWindows%E3%81%A7%E3%81%AE%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E3%83%91%E3%82%B9 chaichanPaPa, Matching Shift_JIS file name http://d.hatena.ne.jp/chaichanPaPa/20080802/1217660826 SUZUKI Norio, Jperl http://homepage2.nifty.com/kipp/perl/jperl/ WATANABE Hirofumi, Jperl http://www.cpan.org/src/5.0/jperl/ http://search.cpan.org/~watanabe/ ftp://ftp.oreilly.co.jp/pcjp98/watanabe/jperlconf.ppt Chuck Houpt, Michiko Nozu, MacJPerl http://habilis.net/macjperl/index.j.html Kenichi Ishigaki, Pod-PerldocJp, Welcome to modern Perl world http://search.cpan.org/dist/Pod-PerldocJp/ http://gihyo.jp/dev/serial/01/modern-perl/0031 http://gihyo.jp/dev/serial/01/modern-perl/0032 http://gihyo.jp/dev/serial/01/modern-perl/0033 Dan Kogai, Encode module http://search.cpan.org/dist/Encode/ http://www.dan.co.jp/~dankogai/yapcasia2006/slide.html Juerd, Perl Unicode Advice http://juerd.nl/site.plp/perluniadvice daily dayflower, 2008-06-25 perluniadvice http://d.hatena.ne.jp/dayflower/20080625/1214374293 Jesse Vincent, Compatibility is a virtue http://www.nntp.perl.org/group/perl.perl5.porters/2010/05/msg159825.html Tokyo-pm archive http://mail.pm.org/pipermail/tokyo-pm/ http://mail.pm.org/pipermail/tokyo-pm/1999-September/001844.html http://mail.pm.org/pipermail/tokyo-pm/1999-September/001854.html ruby-list http://blade.nagaokaut.ac.jp/ruby/ruby-list/index.shtml http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/2440 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/2446 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/2569 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/9427 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/9431 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/10500 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/10501 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/10502 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/12385 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/12392 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/12393 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-list/19156
To install Char::UTF2, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Char::UTF2
CPAN shell
perl -MCPAN -e shell install Char::UTF2
For more information on module installation, please visit the detailed CPAN module installation guide.