/usr/share/perl/5.26.1/utf8_heavy.pl is in perl-modules-5.26 5.26.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use strict;
use warnings;
use re "/aa"; # So we won't even try to look at above Latin1, potentially
# resulting in a recursive call
sub DEBUG () { 0 }
$|=1 if DEBUG;
sub DESTROY {}
my %Cache;
sub croak { require Carp; Carp::croak(@_) }
sub _loose_name ($) {
# Given a lowercase property or property-value name, return its
# standardized version that is expected for look-up in the 'loose' hashes
# in Heavy.pl (hence, this depends on what mktables does). This squeezes
# out blanks, underscores and dashes. The complication stems from the
# grandfathered-in 'L_', which retains a single trailing underscore.
(my $loose = $_[0]) =~ s/[-_ \t]//g;
return $loose if $loose !~ / ^ (?: is | to )? l $/x;
return 'l_' if $_[0] =~ / l .* _ /x; # If original had a trailing '_'
return $loose;
}
##
## "SWASH" == "SWATCH HASH". A "swatch" is a swatch of the Unicode landscape.
## It's a data structure that encodes a set of Unicode characters.
##
{
# If a floating point number is within this distance from the value of a
# fraction, it is considered to be that fraction, even if many more digits
# are specified that don't exactly match.
my $min_floating_slop;
# To guard against this program calling something that in turn ends up
# calling this program with the same inputs, and hence infinitely
# recursing, we keep a stack of the properties that are currently in
# progress, pushed upon entry, popped upon return.
my @recursed;
sub SWASHNEW {
my ($class, $type, $list, $minbits, $none) = @_;
my $user_defined = 0;
local $^D = 0 if $^D;
$class = "" unless defined $class;
print STDERR __LINE__, ": class=$class, type=$type, list=",
(defined $list) ? $list : ':undef:',
", minbits=$minbits, none=$none\n" if DEBUG;
##
## Get the list of codepoints for the type.
## Called from swash_init (see utf8.c) or SWASHNEW itself.
##
## Callers of swash_init:
## op.c:pmtrans -- for tr/// and y///
## regexec.c:regclass_swash -- for /[]/, \p, and \P
## utf8.c:is_utf8_common -- for common Unicode properties
## utf8.c:S__to_utf8_case -- for lc, uc, ucfirst, etc. and //i
## Unicode::UCD::prop_invlist
## Unicode::UCD::prop_invmap
##
## Given a $type, our goal is to fill $list with the set of codepoint
## ranges. If $type is false, $list passed is used.
##
## $minbits:
## For binary properties, $minbits must be 1.
## For character mappings (case and transliteration), $minbits must
## be a number except 1.
##
## $list (or that filled according to $type):
## Refer to perlunicode.pod, "User-Defined Character Properties."
##
## For binary properties, only characters with the property value
## of True should be listed. The 3rd column, if any, will be ignored
##
## $none is undocumented, so I'm (khw) trying to do some documentation
## of it now. It appears to be if there is a mapping in an input file
## that maps to 'XXXX', then that is replaced by $none+1, expressed in
## hexadecimal. It is used somehow in tr///.
##
## To make the parsing of $type clear, this code takes the a rather
## unorthodox approach of last'ing out of the block once we have the
## info we need. Were this to be a subroutine, the 'last' would just
## be a 'return'.
##
# If a problem is found $type is returned;
# Upon success, a new (or cached) blessed object is returned with
# keys TYPE, BITS, EXTRAS, LIST, and NONE with values having the
# same meanings as the input parameters.
# SPECIALS contains a reference to any special-treatment hash in the
# property.
# INVERT_IT is non-zero if the result should be inverted before use
# USER_DEFINED is non-zero if the result came from a user-defined
my $file; ## file to load data from, and also part of the %Cache key.
# Change this to get a different set of Unicode tables
my $unicore_dir = 'unicore';
my $invert_it = 0;
my $list_is_from_mktables = 0; # Is $list returned from a mktables
# generated file? If so, we know it's
# well behaved.
if ($type)
{
# Verify that this isn't a recursive call for this property.
# Can't use croak, as it may try to recurse to here itself.
my $class_type = $class . "::$type";
if (grep { $_ eq $class_type } @recursed) {
CORE::die "panic: Infinite recursion in SWASHNEW for '$type'\n";
}
push @recursed, $class_type;
$type =~ s/^\s+//;
$type =~ s/\s+$//;
# regcomp.c surrounds the property name with '__" and '_i' if this
# is to be caseless matching.
my $caseless = $type =~ s/^(.*)__(.*)_i$/$1$2/;
print STDERR __LINE__, ": type=$type, caseless=$caseless\n" if DEBUG;
GETFILE:
{
##
## It could be a user-defined property. Look in current
## package if no package given
##
my $caller0 = caller(0);
my $caller1 = $type =~ s/(.+):://
? $1
: $caller0 eq 'main'
? 'main'
: caller(1);
if (defined $caller1 && $type =~ /^I[ns]\w+$/) {
my $prop = "${caller1}::$type";
if (exists &{$prop}) {
# stolen from Scalar::Util::PP::tainted()
my $tainted;
{
local($@, $SIG{__DIE__}, $SIG{__WARN__});
local $^W = 0;
no warnings;
eval { kill 0 * $prop };
$tainted = 1 if $@ =~ /^Insecure/;
}
die "Insecure user-defined property \\p{$prop}\n"
if $tainted;
no strict 'refs';
$list = &{$prop}($caseless);
$user_defined = 1;
last GETFILE;
}
}
# During Perl's compilation, this routine may be called before
# the tables are constructed. If so, we have a chicken/egg
# problem. If we die, the tables never get constructed, so
# keep going, but return an empty table so only what the code
# has compiled in internally (currently ASCII/Latin1 range
# matching) will work.
BEGIN {
# Poor man's constant, to avoid a run-time check.
$utf8::{miniperl}
= \! defined &DynaLoader::boot_DynaLoader;
}
if (miniperl) {
eval "require '$unicore_dir/Heavy.pl'";
if ($@) {
print STDERR __LINE__, ": '$@'\n" if DEBUG;
pop @recursed if @recursed;
return $type;
}
}
else {
require "$unicore_dir/Heavy.pl";
}
BEGIN { delete $utf8::{miniperl} }
# All property names are matched caselessly
my $property_and_table = CORE::lc $type;
print STDERR __LINE__, ": $property_and_table\n" if DEBUG;
# See if is of the compound form 'property=value', where the
# value indicates the table we should use.
my ($property, $table, @remainder) =
split /\s*[:=]\s*/, $property_and_table, -1;
if (@remainder) {
pop @recursed if @recursed;
return $type;
}
my $prefix;
if (! defined $table) {
# Here, is the single form. The property becomes empty, and
# the whole value is the table.
$table = $property;
$prefix = $property = "";
} else {
print STDERR __LINE__, ": $property\n" if DEBUG;
# Here it is the compound property=table form. The property
# name is always loosely matched, and always can have an
# optional 'is' prefix (which isn't true in the single
# form).
$property = _loose_name($property) =~ s/^is//r;
# And convert to canonical form. Quit if not valid.
$property = $utf8::loose_property_name_of{$property};
if (! defined $property) {
pop @recursed if @recursed;
return $type;
}
$prefix = "$property=";
# If the rhs looks like it is a number...
print STDERR __LINE__, ": table=$table\n" if DEBUG;
if ($table =~ m{ ^ [ \s 0-9 _ + / . -]+ $ }x) {
print STDERR __LINE__, ": table=$table\n" if DEBUG;
# Don't allow leading nor trailing slashes
if ($table =~ / ^ \/ | \/ $ /x) {
pop @recursed if @recursed;
return $type;
}
# Split on slash, in case it is a rational, like \p{1/5}
my @parts = split m{ \s* / \s* }x, $table, -1;
print __LINE__, ": $type\n" if @parts > 2 && DEBUG;
# Can have maximum of one slash
if (@parts > 2) {
pop @recursed if @recursed;
return $type;
}
foreach my $part (@parts) {
print __LINE__, ": part=$part\n" if DEBUG;
$part =~ s/^\+\s*//; # Remove leading plus
$part =~ s/^-\s*/-/; # Remove blanks after unary
# minus
# Remove underscores between digits.
$part =~ s/(?<= [0-9] ) _ (?= [0-9] ) //xg;
# No leading zeros (but don't make a single '0'
# into a null string)
$part =~ s/ ^ ( -? ) 0+ /$1/x;
$part .= '0' if $part eq '-' || $part eq "";
# No trailing zeros after a decimal point
$part =~ s/ ( \. .*? ) 0+ $ /$1/x;
# Begin with a 0 if a leading decimal point
$part =~ s/ ^ ( -? ) \. /${1}0./x;
# Ensure not a trailing decimal point: turn into an
# integer
$part =~ s/ \. $ //x;
print STDERR __LINE__, ": part=$part\n" if DEBUG;
#return $type if $part eq "";
# Result better look like a number. (This test is
# needed because, for example could have a plus in
# the middle.)
if ($part !~ / ^ -? [0-9]+ ( \. [0-9]+)? $ /x) {
pop @recursed if @recursed;
return $type;
}
}
# If a rational...
if (@parts == 2) {
# If denominator is negative, get rid of it, and ...
if ($parts[1] =~ s/^-//) {
# If numerator is also negative, convert the
# whole thing to positive, else move the minus
# to the numerator
if ($parts[0] !~ s/^-//) {
$parts[0] = '-' . $parts[0];
}
}
$table = join '/', @parts;
}
elsif ($property ne 'nv' || $parts[0] !~ /\./) {
# Here is not numeric value, or doesn't have a
# decimal point. No further manipulation is
# necessary. (Note the hard-coded property name.
# This could fail if other properties eventually
# had fractions as well; perhaps the cjk ones
# could evolve to do that. This hard-coding could
# be fixed by mktables generating a list of
# properties that could have fractions.)
$table = $parts[0];
} else {
# Here is a floating point numeric_value. Try to
# convert to rational. First see if is in the list
# of known ones.
if (exists $utf8::nv_floating_to_rational{$parts[0]}) {
$table = $utf8::nv_floating_to_rational{$parts[0]};
} else {
# Here not in the list. See if is close
# enough to something in the list. First
# determine what 'close enough' means. It has
# to be as tight as what mktables says is the
# maximum slop, and as tight as how many
# digits we were passed. That is, if the user
# said .667, .6667, .66667, etc. we match as
# many digits as they passed until get to
# where it doesn't matter any more due to the
# machine's precision. If they said .6666668,
# we fail.
(my $fraction = $parts[0]) =~ s/^.*\.//;
my $epsilon = 10 ** - (length($fraction));
if ($epsilon > $utf8::max_floating_slop) {
$epsilon = $utf8::max_floating_slop;
}
# But it can't be tighter than the minimum
# precision for this machine. If haven't
# already calculated that minimum, do so now.
if (! defined $min_floating_slop) {
# Keep going down an order of magnitude
# until find that adding this quantity to
# 1 remains 1; but put an upper limit on
# this so in case this algorithm doesn't
# work properly on some platform, that we
# won't loop forever.
my $count = 0;
$min_floating_slop = 1;
while (1+ $min_floating_slop != 1
&& $count++ < 50)
{
my $next = $min_floating_slop / 10;
last if $next == 0; # If underflows,
# use previous one
$min_floating_slop = $next;
print STDERR __LINE__, ": min_float_slop=$min_floating_slop\n" if DEBUG;
}
# Back off a couple orders of magnitude,
# just to be safe.
$min_floating_slop *= 100;
}
if ($epsilon < $min_floating_slop) {
$epsilon = $min_floating_slop;
}
print STDERR __LINE__, ": fraction=.$fraction; epsilon=$epsilon\n" if DEBUG;
undef $table;
# And for each possible rational in the table,
# see if it is within epsilon of the input.
foreach my $official
(keys %utf8::nv_floating_to_rational)
{
print STDERR __LINE__, ": epsilon=$epsilon, official=$official, diff=", abs($parts[0] - $official), "\n" if DEBUG;
if (abs($parts[0] - $official) < $epsilon) {
$table =
$utf8::nv_floating_to_rational{$official};
last;
}
}
# Quit if didn't find one.
if (! defined $table) {
pop @recursed if @recursed;
return $type;
}
}
}
print STDERR __LINE__, ": $property=$table\n" if DEBUG;
}
}
# Combine lhs (if any) and rhs to get something that matches
# the syntax of the lookups.
$property_and_table = "$prefix$table";
print STDERR __LINE__, ": $property_and_table\n" if DEBUG;
# First try stricter matching.
$file = $utf8::stricter_to_file_of{$property_and_table};
# If didn't find it, try again with looser matching by editing
# out the applicable characters on the rhs and looking up
# again.
my $strict_property_and_table;
if (! defined $file) {
# This isn't used unless the name begins with 'to'
$strict_property_and_table = $property_and_table =~ s/^to//r;
$table = _loose_name($table);
$property_and_table = "$prefix$table";
print STDERR __LINE__, ": $property_and_table\n" if DEBUG;
$file = $utf8::loose_to_file_of{$property_and_table};
}
# Add the constant and go fetch it in.
if (defined $file) {
# If the file name contains a !, it means to invert. The
# 0+ makes sure result is numeric
$invert_it = 0 + $file =~ s/!//;
if ($utf8::why_deprecated{$file}) {
warnings::warnif('deprecated', "Use of '$type' in \\p{} or \\P{} is deprecated because: $utf8::why_deprecated{$file};");
}
if ($caseless
&& exists $utf8::caseless_equivalent{$property_and_table})
{
$file = $utf8::caseless_equivalent{$property_and_table};
}
# The pseudo-directory '#' means that there really isn't a
# file to read, the data is in-line as part of the string;
# we extract it below.
$file = "$unicore_dir/lib/$file.pl" unless $file =~ m!^#/!;
last GETFILE;
}
print STDERR __LINE__, ": didn't find $property_and_table\n" if DEBUG;
##
## Last attempt -- see if it's a standard "To" name
## (e.g. "ToLower") ToTitle is used by ucfirst().
## The user-level way to access ToDigit() and ToFold()
## is to use Unicode::UCD.
##
# Only check if caller wants non-binary
if ($minbits != 1) {
if ($property_and_table =~ s/^to//) {
# Look input up in list of properties for which we have
# mapping files. First do it with the strict approach
if (defined ($file = $utf8::strict_property_to_file_of{
$strict_property_and_table}))
{
$type = $utf8::file_to_swash_name{$file};
print STDERR __LINE__, ": type set to $type\n"
if DEBUG;
$file = "$unicore_dir/$file.pl";
last GETFILE;
}
elsif (defined ($file =
$utf8::loose_property_to_file_of{$property_and_table}))
{
$type = $utf8::file_to_swash_name{$file};
print STDERR __LINE__, ": type set to $type\n"
if DEBUG;
$file = "$unicore_dir/$file.pl";
last GETFILE;
} # If that fails see if there is a corresponding binary
# property file
elsif (defined ($file =
$utf8::loose_to_file_of{$property_and_table}))
{
# Here, there is no map file for the property we
# are trying to get the map of, but this is a
# binary property, and there is a file for it that
# can easily be translated to a mapping, so use
# that, treating this as a binary property.
# Setting 'minbits' here causes it to be stored as
# such in the cache, so if someone comes along
# later looking for just a binary, they get it.
$minbits = 1;
# The 0+ makes sure is numeric
$invert_it = 0 + $file =~ s/!//;
$file = "$unicore_dir/lib/$file.pl"
unless $file =~ m!^#/!;
last GETFILE;
}
}
}
##
## If we reach this line, it's because we couldn't figure
## out what to do with $type. Ouch.
##
pop @recursed if @recursed;
return $type;
} # end of GETFILE block
if (defined $file) {
print STDERR __LINE__, ": found it (file='$file')\n" if DEBUG;
##
## If we reach here, it was due to a 'last GETFILE' above
## (exception: user-defined properties and mappings), so we
## have a filename, so now we load it if we haven't already.
# The pseudo-directory '#' means the result isn't really a
# file, but is in-line, with semi-colons to be turned into
# new-lines. Since it is in-line there is no advantage to
# caching the result
if ($file =~ s!^#/!!) {
$list = $utf8::inline_definitions[$file];
}
else {
# Here, we have an actual file to read in and load, but it
# may already have been read-in and cached. The cache key
# is the class and file to load, and whether the results
# need to be inverted.
my $found = $Cache{$class, $file, $invert_it};
if ($found and ref($found) eq $class) {
print STDERR __LINE__, ": Returning cached swash for '$class,$file,$invert_it' for \\p{$type}\n" if DEBUG;
pop @recursed if @recursed;
return $found;
}
local $@;
local $!;
$list = do $file; die $@ if $@;
}
$list_is_from_mktables = 1;
}
} # End of $type is non-null
# Here, either $type was null, or we found the requested property and
# read it into $list
my $extras = "";
my $bits = $minbits;
# mktables lists don't have extras, like '&utf8::prop', so don't need
# to separate them; also lists are already sorted, so don't need to do
# that.
if ($list && ! $list_is_from_mktables) {
my $taint = substr($list,0,0); # maintain taint
# Separate the extras from the code point list, and make sure
# user-defined properties and tr/// are well-behaved for
# downstream code.
if ($user_defined || $none) {
my @tmp = split(/^/m, $list);
my %seen;
no warnings;
# The extras are anything that doesn't begin with a hex digit.
$extras = join '', $taint, grep /^[^0-9a-fA-F]/, @tmp;
# Remove the extras, and sort the remaining entries by the
# numeric value of their beginning hex digits, removing any
# duplicates.
$list = join '', $taint,
map { $_->[1] }
sort { $a->[0] <=> $b->[0] }
map { /^([0-9a-fA-F]+)/ && !$seen{$1}++ ? [ CORE::hex($1), $_ ] : () }
@tmp; # XXX doesn't do ranges right
}
else {
# mktables has gone to some trouble to make non-user defined
# properties well-behaved, so we can skip the effort we do for
# user-defined ones. Any extras are at the very beginning of
# the string.
# This regex splits out the first lines of $list into $1 and
# strips them off from $list, until we get one that begins
# with a hex number, alone on the line, or followed by a tab.
# Either portion may be empty.
$list =~ s/ \A ( .*? )
(?: \z | (?= ^ [0-9a-fA-F]+ (?: \t | $) ) )
//msx;
$extras = "$taint$1";
}
}
if ($none) {
my $hextra = sprintf "%04x", $none + 1;
$list =~ s/\tXXXX$/\t$hextra/mg;
}
if ($minbits != 1 && $minbits < 32) { # not binary property
my $top = 0;
while ($list =~ /^([0-9a-fA-F]+)(?:[\t]([0-9a-fA-F]+)?)(?:[ \t]([0-9a-fA-F]+))?/mg) {
my $min = CORE::hex $1;
my $max = defined $2 ? CORE::hex $2 : $min;
my $val = defined $3 ? CORE::hex $3 : 0;
$val += $max - $min if defined $3;
$top = $val if $val > $top;
}
my $topbits =
$top > 0xffff ? 32 :
$top > 0xff ? 16 : 8;
$bits = $topbits if $bits < $topbits;
}
my @extras;
if ($extras) {
for my $x ($extras) {
my $taint = substr($x,0,0); # maintain taint
pos $x = 0;
while ($x =~ /^([^0-9a-fA-F\n])(.*)/mg) {
my $char = "$1$taint";
my $name = "$2$taint";
print STDERR __LINE__, ": char [$char] => name [$name]\n"
if DEBUG;
if ($char =~ /[-+!&]/) {
my ($c,$t) = split(/::/, $name, 2); # bogus use of ::, really
my $subobj;
if ($c eq 'utf8') {
$subobj = utf8->SWASHNEW($t, "", $minbits, 0);
}
elsif (exists &$name) {
$subobj = utf8->SWASHNEW($name, "", $minbits, 0);
}
elsif ($c =~ /^([0-9a-fA-F]+)/) {
$subobj = utf8->SWASHNEW("", $c, $minbits, 0);
}
print STDERR __LINE__, ": returned from getting sub object for $name\n" if DEBUG;
if (! ref $subobj) {
pop @recursed if @recursed && $type;
return $subobj;
}
push @extras, $name => $subobj;
$bits = $subobj->{BITS} if $bits < $subobj->{BITS};
$user_defined = $subobj->{USER_DEFINED}
if $subobj->{USER_DEFINED};
}
}
}
}
if (DEBUG) {
print STDERR __LINE__, ": CLASS = $class, TYPE => $type, BITS => $bits, NONE => $none, INVERT_IT => $invert_it, USER_DEFINED => $user_defined";
print STDERR "\nLIST =>\n$list" if defined $list;
print STDERR "\nEXTRAS =>\n$extras" if defined $extras;
print STDERR "\n";
}
my $SWASH = bless {
TYPE => $type,
BITS => $bits,
EXTRAS => $extras,
LIST => $list,
NONE => $none,
USER_DEFINED => $user_defined,
@extras,
} => $class;
if ($file) {
$Cache{$class, $file, $invert_it} = $SWASH;
if ($type
&& exists $utf8::SwashInfo{$type}
&& exists $utf8::SwashInfo{$type}{'specials_name'})
{
my $specials_name = $utf8::SwashInfo{$type}{'specials_name'};
no strict "refs";
print STDERR "\nspecials_name => $specials_name\n" if DEBUG;
$SWASH->{'SPECIALS'} = \%$specials_name;
}
$SWASH->{'INVERT_IT'} = $invert_it;
}
pop @recursed if @recursed && $type;
return $SWASH;
}
}
# Now SWASHGET is recasted into a C function S_swatch_get (see utf8.c).
1;
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