diff options
Diffstat (limited to 'regen/unicode_constants.pl')
| -rw-r--r-- | regen/unicode_constants.pl | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/regen/unicode_constants.pl b/regen/unicode_constants.pl new file mode 100644 index 0000000000..e3d588a599 --- /dev/null +++ b/regen/unicode_constants.pl @@ -0,0 +1,146 @@ +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. +# Otherwise, each line represents one #define, and begins with either a +# Unicode character name with the blanks in it squeezed out or replaced by +# underscores; or it may be a hexadecimal Unicode code point. 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 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. +# 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> ) { + if ($_ !~ /\S/) { + print $out_fh "\n"; + next; + } + + chomp; + unless ($_ =~ 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 $cp; + + if ($name_or_cp =~ /[^[:xdigit:]]/) { + + # Anything that isn't a hex value must be a name. + $name = $name_or_cp; + $cp = charnames::vianame($name =~ s/_/ /gr); + die "Unknown name '$name' at line $.: $_\n" unless defined $name; + } + else { + $cp = $name_or_cp; + $name = charnames::viacode("0$cp") // ""; # viacode requires a leading + # zero to be sure that the + # argument is hex + die "Unknown code point '$cp' at line $.: $_\n" unless defined $cp; + } + + $name = $desired_name if $name eq ""; + $name =~ s/ /_/g; # The macro name can have no blanks in it + + my $str = join "", map { sprintf "\\x%02X", $_ } + unpack("U0C*", pack("U", hex $cp)); + + my $suffix = '_UTF8'; + if (! defined $flag || $flag eq 'string') { + $str = "\"$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 hex $cp > 0xff; + $suffix = '_NATIVE'; + $str = utf8::unicode_to_native(hex $cp); + $str = "0x$cp"; # Is a numeric constant + } + else { + die "Unknown flag at line $.: $_\n"; + } + print $out_fh "#define ${name}$suffix $str /* U+$cp */\n"; +} + +print $out_fh "\n#endif /* H_UNICODE_CONSTANTS */\n"; + +read_only_bottom_close_and_rename($out_fh); + +__DATA__ +0300 string +0301 string +0308 string + +03B9 first +03B9 tail + +03C5 first +03C5 tail + +2010 string +D800 first FIRST_SURROGATE + +007F native +00DF native +00E5 native +00C5 native +00FF native +00B5 native +0085 native |