Current File : //proc/thread-self/root/proc/self/root/usr/share/perl5/_charnames.pm
# !!!!!!! INTERNAL PERL USE ONLY !!!!!!!
# This helper module is for internal use by core Perl only. This module is
# subject to change or removal at any time without notice. Don't use it
# directly. Use the public <charnames> module instead.
package _charnames;
use strict;
use warnings;
our $VERSION = '1.45';
use unicore::Name; # mktables-generated algorithmically-defined names
use bytes (); # for $bytes::hint_bits
use re "/aa"; # Everything in here should be ASCII
$Carp::Internal{ (__PACKAGE__) } = 1;
# Translate between Unicode character names and their code points. This is a
# submodule of package <charnames>, used to allow \N{...} to be autoloaded,
# but it was decided not to autoload the various functions in charnames; the
# splitting allows this behavior.
#
# The official names with their code points are stored in a table in
# lib/unicore/Name.pl which is read in as a large string (almost 3/4 Mb in
# Unicode 6.0). Each code point/name combination is separated by a \n in the
# string. (Some of the CJK and the Hangul syllable names are determined
# instead algorithmically via subroutines stored instead in
# lib/unicore/Name.pm). Because of the large size of this table, it isn't
# converted into hashes for faster lookup.
#
# But, user defined aliases are stored in their own hashes, as are Perl
# extensions to the official names. These are checked first before looking at
# the official table.
#
# Basically, the table is grepped for the input code point (viacode()) or
# name (the other functions), and the corresponding value on the same line is
# returned. The grepping is done by turning the input into a regular
# expression. Thus, the same table does double duty, used by both name and
# code point lookup. (If we were to have hashes, we would need two, one for
# each lookup direction.)
#
# For loose name matching, the logical thing would be to have a table
# with all the ignorable characters squeezed out, and then grep it with the
# similiarly-squeezed input name. (And this is in fact how the lookups are
# done with the small Perl extension hashes.) But since we need to be able to
# go from code point to official name, the original table would still need to
# exist. Due to the large size of the table, it was decided to not read
# another very large string into memory for a second table. Instead, the
# regular expression of the input name is modified to have optional spaces and
# dashes between characters. For example, in strict matching, the regular
# expression would be:
# qr/\tDIGIT ONE$/m
# Under loose matching, the blank would be squeezed out, and the re would be:
# qr/\tD[- ]?I[- ]?G[- ]?I[- ]?T[- ]?O[- ]?N[- ]?E$/m
# which matches a blank or dash between any characters in the official table.
#
# This is also how script lookup is done. Basically the re looks like
# qr/ (?:LATIN|GREEK|CYRILLIC) (?:SMALL )?LETTER $name/
# where $name is the loose or strict regex for the remainder of the name.
# The hashes are stored as utf8 strings. This makes it easier to deal with
# sequences. I (khw) also tried making Name.pl utf8, but it slowed things
# down by a factor of 7. I then tried making Name.pl store the ut8
# equivalents but not calling them utf8. That led to similar speed as leaving
# it alone, but since that is harder for a human to parse, I left it as-is.
my %system_aliases = (
'SINGLE-SHIFT 2' => chr utf8::unicode_to_native(0x8E),
'SINGLE-SHIFT 3' => chr utf8::unicode_to_native(0x8F),
'PRIVATE USE 1' => chr utf8::unicode_to_native(0x91),
'PRIVATE USE 2' => chr utf8::unicode_to_native(0x92),
);
# These are the aliases above that differ under :loose and :full matching
# because the :full versions have blanks or hyphens in them.
#my %loose_system_aliases = (
#);
#my %deprecated_aliases;
#$deprecated_aliases{'BELL'} = chr utf8::unicode_to_native(0x07) if $^V lt v5.17.0;
#my %loose_deprecated_aliases = (
#);
# These are special cased in :loose matching, differing only in a medial
# hyphen
my $HANGUL_JUNGSEONG_O_E_utf8 = chr 0x1180;
my $HANGUL_JUNGSEONG_OE_utf8 = chr 0x116C;
my $txt; # The table of official character names
my %full_names_cache; # Holds already-looked-up names, so don't have to
# re-look them up again. The previous versions of charnames had scoping
# bugs. For example if we use script A in one scope and find and cache
# what Z resolves to, we can't use that cache in a different scope that
# uses script B instead of A, as Z might be an entirely different letter
# there; or there might be different aliases in effect in different
# scopes, or :short may be in effect or not effect in different scopes,
# or various combinations thereof. This was solved in this version
# mostly by moving things to %^H. But some things couldn't be moved
# there. One of them was the cache of runtime looked-up names, in part
# because %^H is read-only at runtime. I (khw) don't know why the cache
# was run-time only in the previous versions: perhaps oversight; perhaps
# that compile time looking doesn't happen in a loop so didn't think it
# was worthwhile; perhaps not wanting to make the cache too large. But
# I decided to make it compile time as well; this could easily be
# changed.
# Anyway, this hash is not scoped, and is added to at runtime. It
# doesn't have scoping problems because the data in it is restricted to
# official names, which are always invariant, and we only set it and
# look at it at during :full lookups, so is unaffected by any other
# scoped options. I put this in to maintain parity with the older
# version. If desired, a %short_names cache could also be made, as well
# as one for each script, say in %script_names_cache, with each key
# being a hash for a script named in a 'use charnames' statement. I
# decided not to do that for now, just because it's added complication,
# and because I'm just trying to maintain parity, not extend it.
# Like %full_names_cache, but for use when :loose is in effect. There needs
# to be two caches because :loose may not be in effect for a scope, and a
# loose name could inappropriately be returned when only exact matching is
# called for.
my %loose_names_cache;
# Designed so that test decimal first, and then hex. Leading zeros
# imply non-decimal, as do non-[0-9]
my $decimal_qr = qr/^[1-9]\d*$/;
# Returns the hex number in $1.
my $hex_qr = qr/^(?:[Uu]\+|0[xX])?([[:xdigit:]]+)$/;
sub croak
{
require Carp; goto &Carp::croak;
} # croak
sub carp
{
require Carp; goto &Carp::carp;
} # carp
sub alias (@) # Set up a single alias
{
my @errors;
my $nbsp = chr utf8::unicode_to_native(0xA0);
my $alias = ref $_[0] ? $_[0] : { @_ };
foreach my $name (sort keys %$alias) { # Sort only because it helps having
# deterministic output for
# t/lib/charnames/alias
my $value = $alias->{$name};
next unless defined $value; # Omit if screwed up.
# Is slightly slower to just after this statement see if it is
# decimal, since we already know it is after having converted from
# hex, but makes the code easier to maintain, and is called
# infrequently, only at compile-time
if ($value !~ $decimal_qr && $value =~ $hex_qr) {
my $temp = CORE::hex $1;
$temp = utf8::unicode_to_native($temp) if $value =~ /^[Uu]\+/;
$value = $temp;
}
if ($value =~ $decimal_qr) {
no warnings qw(non_unicode surrogate nonchar); # Allow any of these
$^H{charnames_ord_aliases}{$name} = chr $value;
# Use a canonical form.
$^H{charnames_inverse_ords}{sprintf("%05X", $value)} = $name;
}
else {
my $ok_portion = "";
$ok_portion = $1 if $name =~ / ^ (
\p{_Perl_Charname_Begin}
\p{_Perl_Charname_Continue}*
) /x;
# If the name was fully correct, the above should have matched all of
# it.
if (length $ok_portion < length $name) {
my $first_bad = substr($name, length($ok_portion), 1);
push @errors, "Invalid character in charnames alias definition; "
. "marked by <-- HERE in '$ok_portion$first_bad<-- HERE "
. substr($name, length($ok_portion) + 1)
. "'";
}
else {
if ($name =~ / ( .* \s ) ( \s* ) $ /x) {
push @errors, "charnames alias definitions may not contain "
. "trailing white-space; marked by <-- HERE in "
. "'$1 <-- HERE " . $2 . "'";
next;
}
# Use '+' instead of '*' in this regex, because any trailing
# blanks have already been found
if ($name =~ / ( .*? \s{2} ) ( .+ ) /x) {
push @errors, "charnames alias definitions may not contain a "
. "sequence of multiple spaces; marked by <-- HERE "
. "in '$1 <-- HERE " . $2 . "'";
next;
}
$^H{charnames_name_aliases}{$name} = $value;
}
}
}
# We find and output all errors from this :alias definition, rather than
# failing on the first one, so fewer runs are needed to get it to compile
if (@errors) {
croak join "\n", @errors;
}
return;
} # alias
sub not_legal_use_bytes_msg {
my ($name, $utf8) = @_;
my $return;
if (length($utf8) == 1) {
$return = sprintf("Character 0x%04x with name '%s' is", ord $utf8, $name);
} else {
$return = sprintf("String with name '%s' (and ordinals %s) contains character(s)", $name, join(" ", map { sprintf "0x%04X", ord $_ } split(//, $utf8)));
}
return $return . " above 0xFF with 'use bytes' in effect";
}
sub alias_file ($) # Reads a file containing alias definitions
{
require File::Spec;
my ($arg, $file) = @_;
if (-f $arg && File::Spec->file_name_is_absolute ($arg)) {
$file = $arg;
}
elsif ($arg =~ m/ ^ \p{_Perl_IDStart} \p{_Perl_IDCont}* $/x) {
$file = "unicore/${arg}_alias.pl";
}
else {
croak "Charnames alias file names can only have identifier characters";
}
if (my @alias = do $file) {
@alias == 1 && !defined $alias[0] and
croak "$file cannot be used as alias file for charnames";
@alias % 2 and
croak "$file did not return a (valid) list of alias pairs";
alias (@alias);
return (1);
}
0;
} # alias_file
# For use when don't import anything. This structure must be kept in
# sync with the one that import() fills up.
my %dummy_H = (
charnames_stringified_names => "",
charnames_stringified_ords => "",
charnames_scripts => "",
charnames_full => 1,
charnames_loose => 0,
charnames_short => 0,
);
sub lookup_name ($$$) {
my ($name, $wants_ord, $runtime) = @_;
# Lookup the name or sequence $name in the tables. If $wants_ord is false,
# returns the string equivalent of $name; if true, returns the ordinal value
# instead, but in this case $name must not be a sequence; otherwise undef is
# returned and a warning raised. $runtime is 0 if compiletime, otherwise
# gives the number of stack frames to go back to get the application caller
# info.
# If $name is not found, returns undef in runtime with no warning; and in
# compiletime, the Unicode replacement character, with a warning.
# It looks first in the aliases, then in the large table of official Unicode
# names.
my $result; # The string result
my $save_input;
if ($runtime) {
my $hints_ref = (caller($runtime))[10];
# If we didn't import anything (which happens with 'use charnames ()',
# substitute a dummy structure.
$hints_ref = \%dummy_H if ! defined $hints_ref
|| (! defined $hints_ref->{charnames_full}
&& ! defined $hints_ref->{charnames_loose});
# At runtime, but currently not at compile time, %^H gets
# stringified, so un-stringify back to the original data structures.
# These get thrown away by perl before the next invocation
# Also fill in the hash with the non-stringified data.
# N.B. New fields must be also added to %dummy_H
%{$^H{charnames_name_aliases}} = split ',',
$hints_ref->{charnames_stringified_names};
%{$^H{charnames_ord_aliases}} = split ',',
$hints_ref->{charnames_stringified_ords};
$^H{charnames_scripts} = $hints_ref->{charnames_scripts};
$^H{charnames_full} = $hints_ref->{charnames_full};
$^H{charnames_loose} = $hints_ref->{charnames_loose};
$^H{charnames_short} = $hints_ref->{charnames_short};
}
my $loose = $^H{charnames_loose};
my $lookup_name; # Input name suitably modified for grepping for in the
# table
# User alias should be checked first or else can't override ours, and if we
# were to add any, could conflict with theirs.
if (exists $^H{charnames_ord_aliases}{$name}) {
$result = $^H{charnames_ord_aliases}{$name};
}
elsif (exists $^H{charnames_name_aliases}{$name}) {
$name = $^H{charnames_name_aliases}{$name};
$save_input = $lookup_name = $name; # Cache the result for any error
# message
# The aliases are documented to not match loosely, so change loose match
# into full.
if ($loose) {
$loose = 0;
$^H{charnames_full} = 1;
}
}
else {
# Here, not a user alias. That means that loose matching may be in
# effect; will have to modify the input name.
$lookup_name = $name;
if ($loose) {
$lookup_name = uc $lookup_name;
# Squeeze out all underscores
$lookup_name =~ s/_//g;
# Remove all medial hyphens
$lookup_name =~ s/ (?<= \S ) - (?= \S )//gx;
# Squeeze out all spaces
$lookup_name =~ s/\s//g;
}
# Here, $lookup_name has been modified as necessary for looking in the
# hashes. Check the system alias files next. Most of these aliases are
# the same for both strict and loose matching. To save space, the ones
# which differ are in their own separate hash, which is checked if loose
# matching is selected and the regular match fails. To save time, the
# loose hashes could be expanded to include all aliases, and there would
# only have to be one check. But if someone specifies :loose, they are
# interested in convenience over speed, and the time for this second check
# is miniscule compared to the rest of the routine.
if (exists $system_aliases{$lookup_name}) {
$result = $system_aliases{$lookup_name};
}
# There are currently no entries in this hash, so don't waste time looking
# for them. But the code is retained for the unlikely possibility that
# some will be added in the future.
# elsif ($loose && exists $loose_system_aliases{$lookup_name}) {
# $result = $loose_system_aliases{$lookup_name};
# }
# if (exists $deprecated_aliases{$lookup_name}) {
# require warnings;
# warnings::warnif('deprecated',
# "Unicode character name \"$name\" is deprecated, use \""
# . viacode(ord $deprecated_aliases{$lookup_name})
# . "\" instead");
# $result = $deprecated_aliases{$lookup_name};
# }
# There are currently no entries in this hash, so don't waste time looking
# for them. But the code is retained for the unlikely possibility that
# some will be added in the future.
# elsif ($loose && exists $loose_deprecated_aliases{$lookup_name}) {
# require warnings;
# warnings::warnif('deprecated',
# "Unicode character name \"$name\" is deprecated, use \""
# . viacode(ord $loose_deprecated_aliases{$lookup_name})
# . "\" instead");
# $result = $loose_deprecated_aliases{$lookup_name};
# }
}
my @off; # Offsets into table of pattern match begin and end
# If haven't found it yet...
if (! defined $result) {
# See if has looked this input up earlier.
if (! $loose && $^H{charnames_full} && exists $full_names_cache{$name}) {
$result = $full_names_cache{$name};
}
elsif ($loose && exists $loose_names_cache{$name}) {
$result = $loose_names_cache{$name};
}
else { # Here, must do a look-up
# If full or loose matching succeeded, points to where to cache the
# result
my $cache_ref;
## Suck in the code/name list as a big string.
## Lines look like:
## "00052\tLATIN CAPITAL LETTER R\n"
# or
# "0052 0303\tLATIN CAPITAL LETTER R WITH TILDE\n"
$txt = do "unicore/Name.pl" unless $txt;
## @off will hold the index into the code/name string of the start and
## end of the name as we find it.
## If :loose, look for a loose match; if :full, look for the name
## exactly
# First, see if the name is one which is algorithmically determinable.
# The subroutine is included in Name.pl. The table contained in
# $txt doesn't contain these. Experiments show that checking
# for these before checking for the regular names has no
# noticeable impact on performance for the regular names, but
# the other way around slows down finding these immensely.
# Algorithmically determinables are not placed in the cache because
# that uses up memory, and finding these again is fast.
if (($loose || $^H{charnames_full})
&& (defined (my $ord = charnames::name_to_code_point_special($lookup_name, $loose))))
{
$result = chr $ord;
}
else {
# Not algorithmically determinable; look up in the table. The name
# will be turned into a regex, so quote any meta characters.
$lookup_name = quotemeta $lookup_name;
if ($loose) {
# For loose matches, $lookup_name has already squeezed out the
# non-essential characters. We have to add in code to make the
# squeezed version match the non-squeezed equivalent in the table.
# The only remaining hyphens are ones that start or end a word in
# the original. They have been quoted in $lookup_name so they look
# like "\-". Change all other characters except the backslash
# quotes for any metacharacters, and the final character, so that
# e.g., COLON gets transformed into: /C[- ]?O[- ]?L[- ]?O[- ]?N/
$lookup_name =~ s/ (?! \\ -) # Don't do this to the \- sequence
( [^-\\] ) # Nor the "-" within that sequence,
# nor the "\" that quotes metachars,
# but otherwise put the char into $1
(?=.) # And don't do it for the final char
/$1\[- \]?/gx; # And add an optional blank or
# '-' after each $1 char
# Those remaining hyphens were originally at the beginning or end of
# a word, so they can match either a blank before or after, but not
# both. (Keep in mind that they have been quoted, so are a '\-'
# sequence)
$lookup_name =~ s/\\ -/(?:- | -)/xg;
}
# Do the lookup in the full table if asked for, and if succeeds
# save the offsets and set where to cache the result.
if (($loose || $^H{charnames_full}) && $txt =~ /\t$lookup_name$/m) {
@off = ($-[0] + 1, $+[0]); # The 1 is for the tab
$cache_ref = ($loose) ? \%loose_names_cache : \%full_names_cache;
}
else {
# Here, didn't look for, or didn't find the name.
# If :short is allowed, see if input is like "greek:Sigma".
# Keep in mind that $lookup_name has had the metas quoted.
my $scripts_trie = "";
my $name_has_uppercase;
if (($^H{charnames_short})
&& $lookup_name =~ /^ (?: \\ \s)* # Quoted space
(.+?) # $1 = the script
(?: \\ \s)*
\\ : # Quoted colon
(?: \\ \s)*
(.+?) # $2 = the name
(?: \\ \s)* $
/xs)
{
# Even in non-loose matching, the script traditionally has been
# case insensitive
$scripts_trie = "\U$1";
$lookup_name = $2;
# Use original name to find its input casing, but ignore the
# script part of that to make the determination.
$save_input = $name if ! defined $save_input;
$name =~ s/.*?://;
$name_has_uppercase = $name =~ /[[:upper:]]/;
}
else { # Otherwise look in allowed scripts
$scripts_trie = $^H{charnames_scripts};
# Use original name to find its input casing
$name_has_uppercase = $name =~ /[[:upper:]]/;
}
my $case = $name_has_uppercase ? "CAPITAL" : "SMALL";
return if (! $scripts_trie || $txt !~
/\t (?: $scripts_trie ) \ (?:$case\ )? LETTER \ \U$lookup_name $/xm);
# Here have found the input name in the table.
@off = ($-[0] + 1, $+[0]); # The 1 is for the tab
}
# Here, the input name has been found; we haven't set up the output,
# but we know where in the string
# the name starts. The string is set up so that for single characters
# (and not named sequences), the name is preceded immediately by a
# tab and 5 hex digits for its code, with a \n before those. Named
# sequences won't have the 7th preceding character be a \n.
# (Actually, for the very first entry in the table this isn't strictly
# true: subtracting 7 will yield -1, and the substr below will
# therefore yield the very last character in the table, which should
# also be a \n, so the statement works anyway.)
if (substr($txt, $off[0] - 7, 1) eq "\n") {
$result = chr CORE::hex substr($txt, $off[0] - 6, 5);
# Handle the single loose matching special case, in which two names
# differ only by a single medial hyphen. If the original had a
# hyphen (or more) in the right place, then it is that one.
$result = $HANGUL_JUNGSEONG_O_E_utf8
if $loose
&& $result eq $HANGUL_JUNGSEONG_OE_utf8
&& $name =~ m/O \s* - [-\s]* E/ix;
# Note that this wouldn't work if there were a 2nd
# OE in the name
}
else {
# Here, is a named sequence. Need to go looking for the beginning,
# which is just after the \n from the previous entry in the table.
# The +1 skips past that newline, or, if the rindex() fails, to put
# us to an offset of zero.
my $charstart = rindex($txt, "\n", $off[0] - 7) + 1;
$result = pack("W*", map { CORE::hex }
split " ", substr($txt, $charstart, $off[0] - $charstart - 1));
}
}
# Cache the input so as to not have to search the large table
# again, but only if it came from the one search that we cache.
# (Haven't bothered with the pain of sorting out scoping issues for the
# scripts searches.)
$cache_ref->{$name} = $result if defined $cache_ref;
}
}
# Here, have the result character. If the return is to be an ord, must be
# any single character.
if ($wants_ord) {
return ord($result) if length $result == 1;
}
elsif (! utf8::is_utf8($result)) {
# Here isn't UTF-8. That's OK if it is all ASCII, or we are being called
# at compile time where we know we can guarantee that Unicode rules are
# correctly imposed on the result, or under 'bytes' where we don't want
# those rules. But otherwise we have to make it UTF8 to guarantee Unicode
# rules on the returned string.
return $result if ! $runtime
|| (caller $runtime)[8] & $bytes::hint_bits
|| $result !~ /[[:^ascii:]]/;
utf8::upgrade($result);
return $result;
}
else {
# Here, wants string output. If utf8 is acceptable, just return what
# we've got; otherwise attempt to convert it to non-utf8 and return that.
my $in_bytes = ($runtime)
? (caller $runtime)[8] & $bytes::hint_bits
: $^H & $bytes::hint_bits;
return $result if (! $in_bytes || utf8::downgrade($result, 1)) # The 1 arg
# means don't die on failure
}
# Here, there is an error: either there are too many characters, or the
# result string needs to be non-utf8, and at least one character requires
# utf8. Prefer any official name over the input one for the error message.
if (@off) {
$name = substr($txt, $off[0], $off[1] - $off[0]) if @off;
}
else {
$name = (defined $save_input) ? $save_input : $_[0];
}
if ($wants_ord) {
# Only way to get here in this case is if result too long. Message
# assumes that our only caller that requires single char result is
# vianame.
carp "charnames::vianame() doesn't handle named sequences ($name). Use charnames::string_vianame() instead";
return;
}
# Only other possible failure here is from use bytes.
if ($runtime) {
carp not_legal_use_bytes_msg($name, $result);
return;
} else {
croak not_legal_use_bytes_msg($name, $result);
}
} # lookup_name
sub charnames {
# For \N{...}. Looks up the character name and returns the string
# representation of it.
# The first 0 arg means wants a string returned; the second that we are in
# compile time
return lookup_name($_[0], 0, 0);
}
sub import
{
shift; ## ignore class name
if (not @_) {
carp("'use charnames' needs explicit imports list");
}
$^H{charnames} = \&charnames ;
$^H{charnames_ord_aliases} = {};
$^H{charnames_name_aliases} = {};
$^H{charnames_inverse_ords} = {};
# New fields must be added to %dummy_H, and the code in lookup_name()
# that copies fields from the runtime structure
##
## fill %h keys with our @_ args.
##
my ($promote, %h, @args) = (0);
while (my $arg = shift) {
if ($arg eq ":alias") {
@_ or
croak ":alias needs an argument in charnames";
my $alias = shift;
if (ref $alias) {
ref $alias eq "HASH" or
croak "Only HASH reference supported as argument to :alias";
alias ($alias);
$promote = 1;
next;
}
if ($alias =~ m{:(\w+)$}) {
$1 eq "full" || $1 eq "loose" || $1 eq "short" and
croak ":alias cannot use existing pragma :$1 (reversed order?)";
alias_file ($1) and $promote = 1;
next;
}
alias_file ($alias) and $promote = 1;
next;
}
if (substr($arg, 0, 1) eq ':'
and ! ($arg eq ":full" || $arg eq ":short" || $arg eq ":loose"))
{
warn "unsupported special '$arg' in charnames";
next;
}
push @args, $arg;
}
@args == 0 && $promote and @args = (":full");
@h{@args} = (1) x @args;
# Don't leave these undefined as are tested for in lookup_names
$^H{charnames_full} = delete $h{':full'} || 0;
$^H{charnames_loose} = delete $h{':loose'} || 0;
$^H{charnames_short} = delete $h{':short'} || 0;
my @scripts = map { uc quotemeta } keys %h;
##
## If utf8? warnings are enabled, and some scripts were given,
## see if at least we can find one letter from each script.
##
if (warnings::enabled('utf8') && @scripts) {
$txt = do "unicore/Name.pl" unless $txt;
for my $script (@scripts) {
if (not $txt =~ m/\t$script (?:CAPITAL |SMALL )?LETTER /) {
warnings::warn('utf8', "No such script: '$script'");
$script = quotemeta $script; # Escape it, for use in the re.
}
}
}
# %^H gets stringified, so serialize it ourselves so can extract the
# real data back later.
$^H{charnames_stringified_ords} = join ",", %{$^H{charnames_ord_aliases}};
$^H{charnames_stringified_names} = join ",", %{$^H{charnames_name_aliases}};
$^H{charnames_stringified_inverse_ords} = join ",", %{$^H{charnames_inverse_ords}};
# Modify the input script names for loose name matching if that is also
# specified, similar to the way the base character name is prepared. They
# don't (currently, and hopefully never will) have dashes. These go into a
# regex, and have already been uppercased and quotemeta'd. Squeeze out all
# input underscores, blanks, and dashes. Then convert so will match a blank
# between any characters.
if ($^H{charnames_loose}) {
for (my $i = 0; $i < @scripts; $i++) {
$scripts[$i] =~ s/[_ -]//g;
$scripts[$i] =~ s/ ( [^\\] ) (?= . ) /$1\\ ?/gx;
}
}
$^H{charnames_scripts} = join "|", @scripts; # Stringifiy them as a trie
} # import
# Cache of already looked-up values. This is set to only contain
# official values, and user aliases can't override them, so scoping is
# not an issue.
my %viacode;
my $no_name_code_points_re = join "|", map { sprintf("%05X",
utf8::unicode_to_native($_)) }
0x80, 0x81, 0x84, 0x99;
$no_name_code_points_re = qr/$no_name_code_points_re/;
sub viacode {
# Returns the name of the code point argument
if (@_ != 1) {
carp "charnames::viacode() expects one argument";
return;
}
my $arg = shift;
# This is derived from Unicode::UCD, where it is nearly the same as the
# function _getcode(), but here it makes sure that even a hex argument
# has the proper number of leading zeros, which is critical in
# matching against $txt below
# Must check if decimal first; see comments at that definition
my $hex;
if ($arg =~ $decimal_qr) {
$hex = sprintf "%05X", $arg;
} elsif ($arg =~ $hex_qr) {
$hex = CORE::hex $1;
$hex = utf8::unicode_to_native($hex) if $arg =~ /^[Uu]\+/;
# Below is the line that differs from the _getcode() source
$hex = sprintf "%05X", $hex;
} else {
carp("unexpected arg \"$arg\" to charnames::viacode()");
return;
}
return $viacode{$hex} if exists $viacode{$hex};
my $return;
# If the code point is above the max in the table, there's no point
# looking through it. Checking the length first is slightly faster
if (length($hex) <= 5 || CORE::hex($hex) <= 0x10FFFF) {
$txt = do "unicore/Name.pl" unless $txt;
# See if the name is algorithmically determinable.
my $algorithmic = charnames::code_point_to_name_special(CORE::hex $hex);
if (defined $algorithmic) {
$viacode{$hex} = $algorithmic;
return $algorithmic;
}
# Return the official name, if exists. It's unclear to me (khw) at
# this juncture if it is better to return a user-defined override, so
# leaving it as is for now.
if ($txt =~ m/^$hex\t/m) {
# The name starts with the next character and goes up to the
# next new-line. Using capturing parentheses above instead of
# @+ more than doubles the execution time in Perl 5.13
$return = substr($txt, $+[0], index($txt, "\n", $+[0]) - $+[0]);
# If not one of these 4 code points, return what we've found.
if ($hex !~ / ^ $no_name_code_points_re $ /x) {
$viacode{$hex} = $return;
return $return;
}
# For backwards compatibility, we don't return the official name of
# the 4 code points if there are user-defined aliases for them -- so
# continue looking.
}
}
# See if there is a user name for it, before giving up completely.
# First get the scoped aliases, give up if have none.
my $H_ref = (caller(1))[10];
return if ! defined $return
&& (! defined $H_ref
|| ! exists $H_ref->{charnames_stringified_inverse_ords});
my %code_point_aliases;
if (defined $H_ref->{charnames_stringified_inverse_ords}) {
%code_point_aliases = split ',',
$H_ref->{charnames_stringified_inverse_ords};
return $code_point_aliases{$hex} if exists $code_point_aliases{$hex};
}
# Here there is no user-defined alias, return any official one.
return $return if defined $return;
if (CORE::hex($hex) > 0x10FFFF
&& warnings::enabled('non_unicode'))
{
carp "Unicode characters only allocated up to U+10FFFF (you asked for U+$hex)";
}
return;
} # viacode
1;
# ex: set ts=8 sts=2 sw=2 et:
Mini Shell