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File meta_notation.pm

use strict;
use warnings;

# A tiny private library routine which is a helper to several Perl core
# modules, to allow a paradigm to be implemented in a single place.  The name,
# contents, or even the existence of this file may be changed at any time and
# are NOT to be used by anything outside the Perl core.

sub _meta_notation ($) {

# Returns a copy of the input string with the nonprintable characters
    # below 0x100 changed into printables.  Any ASCII printables or above 0xFF
    # are unchanged.  (XXX Probably above-Latin1 characters should be
    # converted to \X{...})
    #
    # \0 .. \x1F (which are "\c@" .. "\c_") are changed into ^@, ^A, ^B, ...
    # ^Z, ^[, ^\, ^], ^^, ^_
    # \c? is changed into ^?.
    #
    # The above accounts for all the ASCII-range nonprintables.
    #
    # On ASCII platforms, the upper-Latin1-range characters are converted to
    # Meta notation, so that \xC1 becomes 'M-A', \xE2 becomes 'M-b', etc.
    # This is how it always has worked, so is continued that way for backwards
    # compatibility.  The range \x80 .. \x9F becomes M-^@ .. M-^A, M-^B, ...
    # M-^Z, M-^[, M-^\, M-^], M-^, M-^_
    #
    # On EBCDIC platforms, the upper-Latin1-range characters are converted
    # into '\x{...}'  Meta notation doesn't make sense on EBCDIC platforms
    # because the ASCII-range printables are a mixture of upper bit set or
    # not.  [A-Za-Z0-9] all have the upper bit set.  The underscore likely
    # doesn't; and other punctuation may or may not.  There's no simple
    # pattern.

my $string = shift;

$string =~ s/([\0-\037])/
               sprintf("^%c",utf8::unicode_to_native(ord($1)^64))/xeg;
    $string =~ s/\c?/^?/g;
    if (ord("A") == 65) {
        $string =~ s/([\200-\237])/sprintf("M-^%c",(ord($1)&0177)^64)/eg;
        $string =~ s/([\240-\377])/sprintf("M-%c"  ,ord($1)&0177)/eg;
    }
    else {
        no warnings 'experimental::regex_sets';
        # Leave alone things above \xff
        $string =~ s/( (?[ [\x00-\xFF] & [:^print:]])) /
                  sprintf("\\x{%X}", ord($1))/xaeg;
    }

return $string;
}
1

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
Attribute	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
B	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
CPAN	DIR	-	drwxr-xr-x	2024-03-13 04:56:46
Class	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Compress	DIR	-	drwxr-xr-x	2024-03-13 04:36:57
Config	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
DBM_Filter	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Devel	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
ExtUtils	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
File	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Getopt	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
I18N	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IO	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IPC	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Locale	DIR	-	drwxr-xr-x	2025-07-28 08:08:32
Math	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Memoize	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Module	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Net	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Search	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Term	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Text	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Thread	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Tie	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Time	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
URI	DIR	-	drwxr-xr-x	2024-03-13 04:36:40
Unicode	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
User	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
encoding	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
overload	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
unicore	DIR	-	drwxr-xr-x	2025-07-29 10:57:24
vendor_perl	DIR	-	drwxr-xr-x	2025-07-28 08:07:18
warnings	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
AnyDBM_File.pm	text/plain	2.56 KB	-rw-r--r--	2025-07-28 08:07:09
AutoLoader.pm	text/plain	15.43 KB	-rw-r--r--	2025-07-28 08:07:09
AutoSplit.pm	text/plain	19.18 KB	-rw-r--r--	2025-07-28 08:07:09
Benchmark.pm	text/plain	30.3 KB	-rw-r--r--	2025-07-28 08:07:09
CORE.pod	text/plain	3.11 KB	-rw-r--r--	2025-07-28 08:07:09
DB.pm	text/plain	18.48 KB	-rw-r--r--	2025-07-28 08:07:09
DBM_Filter.pm	text/plain	14.05 KB	-rw-r--r--	2025-07-28 08:07:09
DirHandle.pm	text/plain	1.52 KB	-rw-r--r--	2025-07-28 08:07:09
Dumpvalue.pm	text/plain	17.14 KB	-rw-r--r--	2025-07-28 08:07:09
English.pm	text/plain	4.65 KB	-rw-r--r--	2025-07-28 08:07:09
FileCache.pm	text/plain	5.44 KB	-rw-r--r--	2025-07-28 08:07:09
FileHandle.pm	text/plain	6.63 KB	-rw-r--r--	2025-07-28 08:07:09
FindBin.pm	text/plain	4.45 KB	-rw-r--r--	2025-07-28 08:07:09
Internals.pod	text/plain	2.52 KB	-rw-r--r--	2025-07-28 08:07:09
Memoize.pm	text/plain	35.34 KB	-rw-r--r--	2025-07-28 08:08:32
NEXT.pm	text/plain	18.4 KB	-rw-r--r--	2025-07-28 08:07:09
PerlIO.pm	text/plain	10.21 KB	-rw-r--r--	2025-07-28 08:07:09
Safe.pm	text/plain	24.49 KB	-rw-r--r--	2025-07-28 08:07:09
SelectSaver.pm	text/plain	1.05 KB	-rw-r--r--	2025-07-28 08:07:09
SelfLoader.pm	text/plain	17.28 KB	-rw-r--r--	2025-07-28 08:08:32
Symbol.pm	text/plain	4.69 KB	-rw-r--r--	2025-07-28 08:07:09
Test.pm	text/plain	29.35 KB	-rw-r--r--	2025-07-28 08:08:32
Thread.pm	text/plain	8.09 KB	-rw-r--r--	2025-07-28 08:07:09
UNIVERSAL.pm	text/plain	6.44 KB	-rw-r--r--	2025-07-28 08:07:09
URI.pm	text/plain	33.97 KB	-rw-r--r--	2018-01-09 06:42:55
XSLoader.pm	text/plain	11 KB	-rw-r--r--	2025-07-28 08:07:09
_charnames.pm	text/plain	32.39 KB	-rw-r--r--	2025-07-28 08:07:09
autouse.pm	text/plain	4.14 KB	-rw-r--r--	2025-07-28 08:07:09
base.pm	text/plain	10.72 KB	-rw-r--r--	2025-07-28 08:07:09
blib.pm	text/plain	2.04 KB	-rw-r--r--	2025-07-28 08:07:09
bytes.pm	text/plain	3.67 KB	-rw-r--r--	2025-07-28 08:07:09
bytes_heavy.pl	text/plain	758 B	-rw-r--r--	2025-07-28 08:07:09
charnames.pm	text/plain	20.38 KB	-rw-r--r--	2025-07-28 08:07:09
deprecate.pm	text/plain	3.01 KB	-rw-r--r--	2025-07-28 08:07:09
diagnostics.pm	text/plain	18.59 KB	-rw-r--r--	2025-07-28 08:07:09
dumpvar.pl	text/plain	15.19 KB	-rw-r--r--	2025-07-28 08:07:09
feature.pm	text/plain	16.68 KB	-rw-r--r--	2025-07-28 08:07:09
fields.pm	text/plain	9.27 KB	-rw-r--r--	2025-07-28 08:07:09
filetest.pm	text/plain	3.91 KB	-rw-r--r--	2025-07-28 08:07:09
if.pm	text/plain	3.26 KB	-rw-r--r--	2025-07-28 08:07:09
integer.pm	text/plain	3.18 KB	-rw-r--r--	2025-07-28 08:07:09
less.pm	text/plain	3.13 KB	-rw-r--r--	2025-07-28 08:07:09
locale.pm	text/plain	4.74 KB	-rw-r--r--	2025-07-28 08:07:09
meta_notation.pm	text/plain	2.07 KB	-rw-r--r--	2025-07-28 08:07:09
open.pm	text/plain	7.83 KB	-rw-r--r--	2025-07-28 08:08:32
overload.pm	text/plain	52.06 KB	-rw-r--r--	2025-07-28 08:07:09
overloading.pm	text/plain	1.77 KB	-rw-r--r--	2025-07-28 08:07:09
perl5db.pl	text/plain	309 KB	-rw-r--r--	2025-07-28 08:07:09
sigtrap.pm	text/plain	7.43 KB	-rw-r--r--	2025-07-28 08:07:09
sort.pm	text/plain	5.94 KB	-rw-r--r--	2025-07-28 08:07:09
strict.pm	text/plain	4.63 KB	-rw-r--r--	2025-07-28 08:07:09
subs.pm	text/plain	848 B	-rw-r--r--	2025-07-28 08:07:09
utf8.pm	text/plain	8.9 KB	-rw-r--r--	2025-07-28 08:07:09
utf8_heavy.pl	text/plain	30.87 KB	-rw-r--r--	2025-07-28 08:07:09
vars.pm	text/plain	2.36 KB	-rw-r--r--	2025-07-28 08:07:09
vmsish.pm	text/plain	4.21 KB	-rw-r--r--	2025-07-28 08:07:09
warnings.pm	text/plain	43.71 KB	-rw-r--r--	2025-07-28 08:07:09

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