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#!/usr/bin/perl
# unidata_to_charset.pl --- Compute SRFI-14 charsets from UnicodeData.txt
#
# Copyright (C) 2009, 2010 Free Software Foundation, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 3 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
open(my $in, "<", "UnicodeData.txt") or die "Can't open UnicodeData.txt: $!";
open(my $out, ">", "srfi-14.i.c") or die "Can't open srfi-14.i.c: $!";
# For Unicode, we follow Java's specification: a character is
# lowercase if
# * it is not in the range [U+2000,U+2FFF], and
# * the Unicode attribute table does not give a lowercase mapping
# for it, and
# * at least one of the following is true:
# o the Unicode attribute table gives a mapping to uppercase
# for the character, or
# o the name for the character in the Unicode attribute table
# contains the words "SMALL LETTER" or "SMALL LIGATURE".
sub lower_case {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (($codepoint < 0x2000 || $codepoint > 0x2FFF)
&& (!defined($lowercase) || $lowercase eq "")
&& ((defined($uppercase) && $uppercase ne "")
|| ($name =~ /(SMALL LETTER|SMALL LIGATURE)/))) {
return 1;
} else {
return 0;
}
}
# For Unicode, we follow Java's specification: a character is
# uppercase if
# * it is not in the range [U+2000,U+2FFF], and
# * the Unicode attribute table does not give an uppercase mapping
# for it (this excludes titlecase characters), and
# * at least one of the following is true:
# o the Unicode attribute table gives a mapping to lowercase
# for the character, or
# o the name for the character in the Unicode attribute table
# contains the words "CAPITAL LETTER" or "CAPITAL LIGATURE".
sub upper_case {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (($codepoint < 0x2000 || $codepoint > 0x2FFF)
&& (!defined($uppercase) || $uppercase eq "")
&& ((defined($lowercase) && $lowercase ne "")
|| ($name =~ /(CAPITAL LETTER|CAPITAL LIGATURE)/))) {
return 1;
} else {
return 0;
}
}
# A character is titlecase if it has the category Lt in the character
# attribute database.
sub title_case {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (defined($category) && $category eq "Lt") {
return 1;
} else {
return 0;
}
}
# A letter is any character with one of the letter categories (Lu, Ll,
# Lt, Lm, Lo) in the Unicode character database.
sub letter {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (defined($category) && ($category eq "Lu"
|| $category eq "Ll"
|| $category eq "Lt"
|| $category eq "Lm"
|| $category eq "Lo")) {
return 1;
} else {
return 0;
}
}
# A character is a digit if it has the category Nd in the character
# attribute database. In Latin-1 and ASCII, the only such characters
# are 0123456789. In Unicode, there are other digit characters in
# other code blocks, such as Gujarati digits and Tibetan digits.
sub digit {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (defined($category) && $category eq "Nd") {
return 1;
} else {
return 0;
}
}
# The only hex digits are 0123456789abcdefABCDEF.
sub hex_digit {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (($codepoint >= 0x30 && $codepoint <= 0x39)
|| ($codepoint >= 0x41 && $codepoint <= 0x46)
|| ($codepoint >= 0x61 && $codepoint <= 0x66)) {
return 1;
} else {
return 0;
}
}
# The union of char-set:letter and char-set:digit.
sub letter_plus_digit {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (letter($codepoint, $name, $category, $uppercase, $lowercase)
|| digit($codepoint, $name, $category, $uppercase, $lowercase)) {
return 1;
} else {
return 0;
}
}
# Characters that would 'use ink' when printed
sub graphic {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($category =~ (/L|M|N|P|S/)) {
return 1;
} else {
return 0;
}
}
# A whitespace character is either
# * a character with one of the space, line, or paragraph separator
# categories (Zs, Zl or Zp) of the Unicode character database.
# * U+0009 Horizontal tabulation (\t control-I)
# * U+000A Line feed (\n control-J)
# * U+000B Vertical tabulation (\v control-K)
# * U+000C Form feed (\f control-L)
# * U+000D Carriage return (\r control-M)
sub whitespace {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($category =~ (/Zs|Zl|Zp/)
|| $codepoint == 0x9
|| $codepoint == 0xA
|| $codepoint == 0xB
|| $codepoint == 0xC
|| $codepoint == 0xD) {
return 1;
} else {
return 0;
}
}
# A printing character is one that would occupy space when printed,
# i.e., a graphic character or a space character. char-set:printing is
# the union of char-set:whitespace and char-set:graphic.
sub printing {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (whitespace($codepoint, $name, $category, $uppercase, $lowercase)
|| graphic($codepoint, $name, $category, $uppercase, $lowercase)) {
return 1;
} else {
return 0;
}
}
# The ISO control characters are the Unicode/Latin-1 characters in the
# ranges [U+0000,U+001F] and [U+007F,U+009F].
sub iso_control {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if (($codepoint >= 0x00 && $codepoint <= 0x1F)
|| ($codepoint >= 0x7F && $codepoint <= 0x9F)) {
return 1;
} else {
return 0;
}
}
# A punctuation character is any character that has one of the
# punctuation categories in the Unicode character database (Pc, Pd,
# Ps, Pe, Pi, Pf, or Po.)
# Note that srfi-14 gives conflicting requirements!! It claims that
# only the Unicode punctuation is necessary, but, explicitly calls out
# the soft hyphen character (U+00AD) as punctution. Current versions
# of Unicode consider U+00AD to be a formatting character, not
# punctuation.
sub punctuation {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($category =~ (/P/)) {
return 1;
} else {
return 0;
}
}
# A symbol is any character that has one of the symbol categories in
# the Unicode character database (Sm, Sc, Sk, or So).
sub symbol {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($category =~ (/S/)) {
return 1;
} else {
return 0;
}
}
# Blank chars are horizontal whitespace. A blank character is either
# * a character with the space separator category (Zs) in the
# Unicode character database.
# * U+0009 Horizontal tabulation (\t control-I)
sub blank {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($category =~ (/Zs/)
|| $codepoint == 0x9) {
return 1;
} else {
return 0;
}
}
# ASCII
sub ascii {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($codepoint <= 0x7F) {
return 1;
} else {
return 0;
}
}
# Empty
sub empty {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
return 0;
}
# Designated -- All characters except for the surrogates
sub designated {
my($codepoint, $name, $category, $uppercase, $lowercase)= @_;
if ($category =~ (/Cs/)) {
return 0;
} else {
return 1;
}
}
# The procedure generates the two C structures necessary to describe a
# given category.
sub compute {
my($f) = @_;
my $start = -1;
my $end = -1;
my $len = 0;
my @rstart = (-1);
my @rend = (-1);
seek($in, 0, 0) or die "Can't seek to beginning of file: $!";
print "$f\n";
while (<$in>) {
# Parse the 14 column, semicolon-delimited UnicodeData.txt
# file
chomp;
my(@fields) = split(/;/);
# The codepoint: an integer
my $codepoint = hex($fields[0]);
# If this is a character range, the last character in this
# range
my $codepoint_end = $codepoint;
# The name of the character
my $name = $fields[1];
# A two-character category code, such as Ll (lower-case
# letter)
my $category = $fields[2];
# The codepoint of the uppercase version of this char
my $uppercase = $fields[12];
# The codepoint of the lowercase version of this char
my $lowercase = $fields[13];
my $pass = &$f($codepoint,$name,$category,$uppercase,$lowercase);
if ($pass == 1) {
# Some pairs of lines in UnicodeData.txt delimit ranges of
# characters.
if ($name =~ /First/) {
$line = <$in>;
die $! if $!;
$codepoint_end = hex( (split(/;/, $line))[0] );
}
# Compute ranges of characters [start:end] that meet the
# criteria. Store the ranges.
if ($start == -1) {
$start = $codepoint;
$end = $codepoint_end;
} elsif ($end + 1 == $codepoint) {
$end = $codepoint_end;
} else {
$rstart[$len] = $start;
$rend[$len] = $end;
$len++;
$start = $codepoint;
$end = $codepoint_end;
}
}
}
# Extra logic to ensure that the last range is included
if ($start != -1) {
if ($len > 0 && $rstart[@rstart-1] != $start) {
$rstart[$len] = $start;
$rend[$len] = $end;
$len++;
} elsif ($len == 0) {
$rstart[0] = $start;
$rend[0] = $end;
$len++;
}
}
# Print the C struct that contains the range list.
print $out "scm_t_char_range cs_" . $f . "_ranges[] = {\n";
if ($rstart[0] != -1) {
for (my $i=0; $i<@rstart-1; $i++) {
printf $out " {0x%04x, 0x%04x},\n", $rstart[$i], $rend[$i];
}
printf $out " {0x%04x, 0x%04x}\n", $rstart[@rstart-1], $rend[@rstart-1];
}
print $out "};\n\n";
# Print the C struct that contains the range list length and
# pointer to the range list.
print $out "scm_t_char_set cs_${f} = {\n";
print $out " $len,\n";
print $out " cs_" . $f . "_ranges\n";
print $out "};\n\n";
}
# Write a bit of a header
print $out "/* srfi-14.i.c -- standard SRFI-14 character set data */\n\n";
print $out "/* This file is #include'd by srfi-14.c. */\n\n";
print $out "/* This file was generated from\n";
print $out " http://unicode.org/Public/UNIDATA/UnicodeData.txt\n";
print $out " with the unidata_to_charset.pl script. */\n\n";
# Write the C structs for each SRFI-14 charset
compute "lower_case";
compute "upper_case";
compute "title_case";
compute "letter";
compute "digit";
compute "hex_digit";
compute "letter_plus_digit";
compute "graphic";
compute "whitespace";
compute "printing";
compute "iso_control";
compute "punctuation";
compute "symbol";
compute "blank";
compute "ascii";
compute "empty";
compute "designated";
close $in;
close $out;
exec ('indent srfi-14.i.c') or print STDERR "call to 'indent' failed: $!";
# And we're done.
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