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use v5.16.0;
use strict;
use warnings;
require 'regen/regen_lib.pl';
use charnames qw(:loose);
my $out_fh = open_new('unicode_constants.h', '>',
{style => '*', by => $0,
from => "Unicode data"});
print $out_fh <<END;
#ifndef H_UNICODE_CONSTANTS /* Guard against nested #includes */
#define H_UNICODE_CONSTANTS 1
/* This file contains #defines for various Unicode code points. The values
* the macros expand to are the native Unicode code point, or all or portions
* of the UTF-8 encoding for the code point. In the former case, the macro
* name has the suffix "_NATIVE"; otherwise, the suffix "_UTF8".
*
* The macros that have the suffix "_UTF8" may have further suffixes, as
* follows:
* "_FIRST_BYTE" if the value is just the first byte of the UTF-8
* representation; the value will be a numeric constant.
* "_TAIL" if instead it represents all but the first byte. This, and
* with no additional suffix are both string constants */
END
# The data are at the end of this file. A blank line is output as-is.
# Comments (lines whose first non-blank is a '#') are converted to C-style,
# though empty comments are converted to blank lines. Otherwise, each line
# represents one #define, and begins with either a Unicode character name with
# the blanks and dashes in it squeezed out or replaced by underscores; or it
# may be a hexadecimal Unicode code point of the form U+xxxx. In the latter
# case, the name will be looked-up to use as the name of the macro. In either
# case, the macro name will have suffixes as listed above, and all blanks and
# dashes will be replaced by underscores.
#
# Each line may optionally have one of the following flags on it, separated by
# white space from the initial token.
# string indicates that the output is to be of the string form
# described in the comments above that are placed in the file.
# string_skip_ifundef is the same as 'string', but instead of dying if the
# code point doesn't exist, the line is just skipped: no output is
# generated for it
# first indicates that the output is to be of the FIRST_BYTE form.
# tail indicates that the output is of the _TAIL form.
# native indicates that the output is the code point, converted to the
# platform's native character set if applicable
#
# If the code point has no official name, the desired name may be appended
# after the flag, which will be ignored if there is an official name.
#
# This program is used to make it convenient to create compile time constants
# of UTF-8, and to generate proper EBCDIC as well as ASCII without manually
# having to figure things out.
while ( <DATA> ) {
chomp;
# Convert any '#' comments to /* ... */; empty lines and comments are
# output as blank lines
if ($_ =~ m/ ^ \s* (?: \# ( .* ) )? $ /x) {
my $comment_body = $1 // "";
if ($comment_body ne "") {
print $out_fh "/* $comment_body */\n";
}
else {
print $out_fh "\n";
}
next;
}
unless ($_ =~ m/ ^ ( [^\ ]* ) # Name or code point token
(?: [\ ]+ ( [^ ]* ) )? # optional flag
(?: [\ ]+ ( .* ) )? # name if unnamed; flag is required
/x)
{
die "Unexpected syntax at line $.: $_\n";
}
my $name_or_cp = $1;
my $flag = $2;
my $desired_name = $3;
my $name;
my $cp;
my $U_cp; # code point in Unicode (not-native) terms
my $undef_ok = $desired_name || $flag =~ /skip_if_undef/;
if ($name_or_cp =~ /^U\+(.*)/) {
$U_cp = hex $1;
$name = charnames::viacode($name_or_cp);
if (! defined $name) {
die "Unknown code point '$name_or_cp' at line $.: $_\n" unless $undef_ok;
$name = "";
}
$cp = utf8::unicode_to_native($U_cp);
}
else {
$name = $name_or_cp;
$cp = charnames::vianame($name =~ s/_/ /gr);
$U_cp = utf8::native_to_unicode($cp);
die "Unknown name '$name' at line $.: $_\n" unless defined $name;
}
$name = $desired_name if $name eq "" && $desired_name;
$name =~ s/[- ]/_/g; # The macro name can have no blanks nor dashes
my $str = join "", map { sprintf "\\x%02X", $_ }
unpack("U0C*", pack("U", $cp));
my $suffix = '_UTF8';
if (! defined $flag || $flag =~ /^ string (_skip_if_undef)? $/x) {
$str = "\"$str\""; # Will be a string constant
} elsif ($flag eq 'tail') {
$str =~ s/\\x..//; # Remove the first byte
$suffix .= '_TAIL';
$str = "\"$str\""; # Will be a string constant
}
elsif ($flag eq 'first') {
$str =~ s/ \\x ( .. ) .* /$1/x; # Get the two nibbles of the 1st byte
$suffix .= '_FIRST_BYTE';
$str = "0x$str"; # Is a numeric constant
}
elsif ($flag eq 'native') {
die "Are you sure you want to run this on an above-Latin1 code point?" if $cp > 0xff;
$suffix = '_NATIVE';
$str = sprintf "0x%02X", $cp; # Is a numeric constant
}
else {
die "Unknown flag at line $.: $_\n";
}
printf $out_fh "#define %s%s %s /* U+%04X */\n", $name, $suffix, $str, $U_cp;
}
print $out_fh "\n#endif /* H_UNICODE_CONSTANTS */\n";
read_only_bottom_close_and_rename($out_fh);
__DATA__
U+017F string
U+0300 string
U+0399 string
U+03BC string
U+1E9E string
U+FB05 string
U+FB06 string
U+2010 string
U+D800 first FIRST_SURROGATE
BOM first
BOM tail
DEL native
CR native
LF native
U+00DF native
U+00E5 native
U+00C5 native
U+00FF native
U+00B5 native
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