package Unicode::UCD; use strict; use warnings; no warnings 'surrogate'; # surrogates can be inputs to this use charnames (); use Unicode::Normalize qw(getCombinClass NFD); our $VERSION = '0.43'; use Storable qw(dclone); require Exporter; our @ISA = qw(Exporter); our @EXPORT_OK = qw(charinfo charblock charscript charblocks charscripts charinrange general_categories bidi_types compexcl casefold casespec namedseq num prop_aliases prop_value_aliases prop_invlist prop_invmap MAX_CP ); use Carp; =head1 NAME Unicode::UCD - Unicode character database =head1 SYNOPSIS use Unicode::UCD 'charinfo'; my $charinfo = charinfo($codepoint); use Unicode::UCD 'casefold'; my $casefold = casefold(0xFB00); use Unicode::UCD 'casespec'; my $casespec = casespec(0xFB00); use Unicode::UCD 'charblock'; my $charblock = charblock($codepoint); use Unicode::UCD 'charscript'; my $charscript = charscript($codepoint); use Unicode::UCD 'charblocks'; my $charblocks = charblocks(); use Unicode::UCD 'charscripts'; my $charscripts = charscripts(); use Unicode::UCD qw(charscript charinrange); my $range = charscript($script); print "looks like $script\n" if charinrange($range, $codepoint); use Unicode::UCD qw(general_categories bidi_types); my $categories = general_categories(); my $types = bidi_types(); use Unicode::UCD 'prop_aliases'; my @space_names = prop_aliases("space"); use Unicode::UCD 'prop_value_aliases'; my @gc_punct_names = prop_value_aliases("Gc", "Punct"); use Unicode::UCD 'prop_invlist'; my @puncts = prop_invlist("gc=punctuation"); use Unicode::UCD 'prop_invmap'; my ($list_ref, $map_ref, $format, $missing) = prop_invmap("General Category"); use Unicode::UCD 'compexcl'; my $compexcl = compexcl($codepoint); use Unicode::UCD 'namedseq'; my $namedseq = namedseq($named_sequence_name); my $unicode_version = Unicode::UCD::UnicodeVersion(); my $convert_to_numeric = Unicode::UCD::num("\N{RUMI DIGIT ONE}\N{RUMI DIGIT TWO}"); =head1 DESCRIPTION The Unicode::UCD module offers a series of functions that provide a simple interface to the Unicode Character Database. =head2 code point argument Some of the functions are called with a I, which is either a decimal or a hexadecimal scalar designating a Unicode code point, or C followed by hexadecimals designating a Unicode code point. In other words, if you want a code point to be interpreted as a hexadecimal number, you must prefix it with either C<0x> or C, because a string like e.g. C<123> will be interpreted as a decimal code point. Note that the largest code point in Unicode is U+10FFFF. =cut my $BLOCKSFH; my $VERSIONFH; my $CASEFOLDFH; my $CASESPECFH; my $NAMEDSEQFH; sub openunicode { my ($rfh, @path) = @_; my $f; unless (defined $$rfh) { for my $d (@INC) { use File::Spec; $f = File::Spec->catfile($d, "unicore", @path); last if open($$rfh, $f); undef $f; } croak __PACKAGE__, ": failed to find ", File::Spec->catfile(@path), " in @INC" unless defined $f; } return $f; } =head2 B use Unicode::UCD 'charinfo'; my $charinfo = charinfo(0x41); This returns information about the input L as a reference to a hash of fields as defined by the Unicode standard. If the L is not assigned in the standard (i.e., has the general category C meaning C) or is a non-character (meaning it is guaranteed to never be assigned in the standard), C is returned. Fields that aren't applicable to the particular code point argument exist in the returned hash, and are empty. The keys in the hash with the meanings of their values are: =over =item B the input L expressed in hexadecimal, with leading zeros added if necessary to make it contain at least four hexdigits =item B name of I, all IN UPPER CASE. Some control-type code points do not have names. This field will be empty for C and C code points, and for the others without a name, it will contain a description enclosed in angle brackets, like CcontrolE>. =item B The short name of the general category of I. This will match one of the keys in the hash returned by L. The L function can be used to get all the synonyms of the category name. =item B the combining class number for I used in the Canonical Ordering Algorithm. For Unicode 5.1, this is described in Section 3.11 C available at L The L function can be used to get all the synonyms of the combining class number. =item B bidirectional type of I. This will match one of the keys in the hash returned by L. The L function can be used to get all the synonyms of the bidi type name. =item B is empty if I has no decomposition; or is one or more codes (separated by spaces) that, taken in order, represent a decomposition for I. Each has at least four hexdigits. The codes may be preceded by a word enclosed in angle brackets then a space, like CcompatE >, giving the type of decomposition This decomposition may be an intermediate one whose components are also decomposable. Use L to get the final decomposition. =item B if I is a decimal digit this is its integer numeric value =item B if I represents some other digit-like number, this is its integer numeric value =item B if I represents a whole or rational number, this is its numeric value. Rational values are expressed as a string like C<1/4>. =item B C or C designating if I is mirrored in bidirectional text =item B name of I in the Unicode 1.0 standard if one existed for this code point and is different from the current name =item B As of Unicode 6.0, this is always empty. =item B is empty if there is no single code point uppercase mapping for I (its uppercase mapping is itself); otherwise it is that mapping expressed as at least four hexdigits. (L should be used in addition to B for case mappings when the calling program can cope with multiple code point mappings.) =item B is empty if there is no single code point lowercase mapping for I (its lowercase mapping is itself); otherwise it is that mapping expressed as at least four hexdigits. (L should be used in addition to B for case mappings when the calling program can cope with multiple code point mappings.) =item B is empty if there is no single code point titlecase mapping for I<code> (its titlecase mapping is itself); otherwise it is that mapping expressed as at least four hexdigits. (L</casespec()> should be used in addition to B<charinfo()> for case mappings when the calling program can cope with multiple code point mappings.) =item B<block> the block I<code> belongs to (used in C<\p{Blk=...}>). See L</Blocks versus Scripts>. =item B<script> the script I<code> belongs to. See L</Blocks versus Scripts>. =back Note that you cannot do (de)composition and casing based solely on the I<decomposition>, I<combining>, I<lower>, I<upper>, and I<title> fields; you will need also the L</compexcl()>, and L</casespec()> functions. =cut # NB: This function is nearly duplicated in charnames.pm sub _getcode { my $arg = shift; if ($arg =~ /^[1-9]\d*$/) { return $arg; } elsif ($arg =~ /^(?:[Uu]\+|0[xX])?([[:xdigit:]]+)$/) { return hex($1); } return; } # Populated by _num. Converts real number back to input rational my %real_to_rational; # To store the contents of files found on disk. my @BIDIS; my @CATEGORIES; my @DECOMPOSITIONS; my @NUMERIC_TYPES; my %SIMPLE_LOWER; my %SIMPLE_TITLE; my %SIMPLE_UPPER; my %UNICODE_1_NAMES; sub charinfo { # This function has traditionally mimicked what is in UnicodeData.txt, # warts and all. This is a re-write that avoids UnicodeData.txt so that # it can be removed to save disk space. Instead, this assembles # information gotten by other methods that get data from various other # files. It uses charnames to get the character name; and various # mktables tables. use feature 'unicode_strings'; my $arg = shift; my $code = _getcode($arg); croak __PACKAGE__, "::charinfo: unknown code '$arg'" unless defined $code; # Non-unicode implies undef. return if $code > 0x10FFFF; my %prop; my $char = chr($code); @CATEGORIES =_read_table("To/Gc.pl") unless @CATEGORIES; $prop{'category'} = _search(\@CATEGORIES, 0, $#CATEGORIES, $code) // $utf8::SwashInfo{'ToGc'}{'missing'}; return if $prop{'category'} eq 'Cn'; # Unassigned code points are undef $prop{'code'} = sprintf "%04X", $code; $prop{'name'} = ($char =~ /\p{Cntrl}/) ? '<control>' : (charnames::viacode($code) // ""); $prop{'combining'} = getCombinClass($code); @BIDIS =_read_table("To/Bc.pl") unless @BIDIS; $prop{'bidi'} = _search(\@BIDIS, 0, $#BIDIS, $code) // $utf8::SwashInfo{'ToBc'}{'missing'}; # For most code points, we can just read in "unicore/Decomposition.pl", as # its contents are exactly what should be output. But that file doesn't # contain the data for the Hangul syllable decompositions, which can be # algorithmically computed, and NFD() does that, so we call NFD() for # those. We can't use NFD() for everything, as it does a complete # recursive decomposition, and what this function has always done is to # return what's in UnicodeData.txt which doesn't show that recursiveness. # Fortunately, the NFD() of the Hanguls doesn't have any recursion # issues. # Having no decomposition implies an empty field; otherwise, all but # "Canonical" imply a compatible decomposition, and the type is prefixed # to that, as it is in UnicodeData.txt if ($char =~ /\p{Block=Hangul_Syllables}/) { # The code points of the decomposition are output in standard Unicode # hex format, separated by blanks. $prop{'decomposition'} = join " ", map { sprintf("%04X", $_)} unpack "U*", NFD($char); } else { @DECOMPOSITIONS = _read_table("Decomposition.pl") unless @DECOMPOSITIONS; $prop{'decomposition'} = _search(\@DECOMPOSITIONS, 0, $#DECOMPOSITIONS, $code) // ""; } # Can use num() to get the numeric values, if any. if (! defined (my $value = num($char))) { $prop{'decimal'} = $prop{'digit'} = $prop{'numeric'} = ""; } else { if ($char =~ /\d/) { $prop{'decimal'} = $prop{'digit'} = $prop{'numeric'} = $value; } else { # For non-decimal-digits, we have to read in the Numeric type # to distinguish them. It is not just a matter of integer vs. # rational, as some whole number values are not considered digits, # e.g., TAMIL NUMBER TEN. $prop{'decimal'} = ""; @NUMERIC_TYPES =_read_table("To/Nt.pl") unless @NUMERIC_TYPES; if ((_search(\@NUMERIC_TYPES, 0, $#NUMERIC_TYPES, $code) // "") eq 'Digit') { $prop{'digit'} = $prop{'numeric'} = $value; } else { $prop{'digit'} = ""; $prop{'numeric'} = $real_to_rational{$value} // $value; } } } $prop{'mirrored'} = ($char =~ /\p{Bidi_Mirrored}/) ? 'Y' : 'N'; %UNICODE_1_NAMES =_read_table("To/Na1.pl", "use_hash") unless %UNICODE_1_NAMES; $prop{'unicode10'} = $UNICODE_1_NAMES{$code} // ""; # This is true starting in 6.0, but, num() also requires 6.0, so # don't need to test for version again here. $prop{'comment'} = ""; %SIMPLE_UPPER = _read_table("To/Uc.pl", "use_hash") unless %SIMPLE_UPPER; $prop{'upper'} = (defined $SIMPLE_UPPER{$code}) ? sprintf("%04X", $SIMPLE_UPPER{$code}) : ""; %SIMPLE_LOWER = _read_table("To/Lc.pl", "use_hash") unless %SIMPLE_LOWER; $prop{'lower'} = (defined $SIMPLE_LOWER{$code}) ? sprintf("%04X", $SIMPLE_LOWER{$code}) : ""; %SIMPLE_TITLE = _read_table("To/Tc.pl", "use_hash") unless %SIMPLE_TITLE; $prop{'title'} = (defined $SIMPLE_TITLE{$code}) ? sprintf("%04X", $SIMPLE_TITLE{$code}) : ""; $prop{block} = charblock($code); $prop{script} = charscript($code); return \%prop; } sub _search { # Binary search in a [[lo,hi,prop],[...],...] table. my ($table, $lo, $hi, $code) = @_; return if $lo > $hi; my $mid = int(($lo+$hi) / 2); if ($table->[$mid]->[0] < $code) { if ($table->[$mid]->[1] >= $code) { return $table->[$mid]->[2]; } else { _search($table, $mid + 1, $hi, $code); } } elsif ($table->[$mid]->[0] > $code) { _search($table, $lo, $mid - 1, $code); } else { return $table->[$mid]->[2]; } } sub _read_table ($;$) { # Returns the contents of the mktables generated table file located at $1 # in the form of either an array of arrays or a hash, depending on if the # optional second parameter is true (for hash return) or not. In the case # of a hash return, each key is a code point, and its corresponding value # is what the table gives as the code point's corresponding value. In the # case of an array return, each outer array denotes a range with [0] the # start point of that range; [1] the end point; and [2] the value that # every code point in the range has. The hash return is useful for fast # lookup when the table contains only single code point ranges. The array # return takes much less memory when there are large ranges. # # This function has the side effect of setting # $utf8::SwashInfo{$property}{'format'} to be the mktables format of the # table; and # $utf8::SwashInfo{$property}{'missing'} to be the value for all entries # not listed in the table. # where $property is the Unicode property name, preceded by 'To' for map # properties., e.g., 'ToSc'. # # Table entries look like one of: # 0000 0040 Common # [65] # 00AA Latin my $table = shift; my $return_hash = shift; $return_hash = 0 unless defined $return_hash; my @return; my %return; local $_; my $list = do "unicore/$table"; # Look up if this property requires adjustments, which we do below if it # does. require "unicore/Heavy.pl"; my $property = $table =~ s/\.pl//r; $property = $utf8::file_to_swash_name{$property}; my $to_adjust = defined $property && $utf8::SwashInfo{$property}{'format'} eq 'a'; for (split /^/m, $list) { my ($start, $end, $value) = / ^ (.+?) \t (.*?) \t (.+?) \s* ( \# .* )? # Optional comment $ /x; my $decimal_start = hex $start; my $decimal_end = ($end eq "") ? $decimal_start : hex $end; if ($return_hash) { foreach my $i ($decimal_start .. $decimal_end) { $return{$i} = ($to_adjust) ? $value + $i - $decimal_start : $value; } } elsif (! $to_adjust && @return && $return[-1][1] == $decimal_start - 1 && $return[-1][2] eq $value) { # If this is merely extending the previous range, do just that. $return[-1]->[1] = $decimal_end; } else { push @return, [ $decimal_start, $decimal_end, $value ]; } } return ($return_hash) ? %return : @return; } sub charinrange { my ($range, $arg) = @_; my $code = _getcode($arg); croak __PACKAGE__, "::charinrange: unknown code '$arg'" unless defined $code; _search($range, 0, $#$range, $code); } =head2 B<charblock()> use Unicode::UCD 'charblock'; my $charblock = charblock(0x41); my $charblock = charblock(1234); my $charblock = charblock(0x263a); my $charblock = charblock("U+263a"); my $range = charblock('Armenian'); With a L</code point argument> charblock() returns the I<block> the code point belongs to, e.g. C<Basic Latin>. The old-style block name is returned (see L</Old-style versus new-style block names>). If the code point is unassigned, this returns the block it would belong to if it were assigned. See also L</Blocks versus Scripts>. If supplied with an argument that can't be a code point, charblock() tries to do the opposite and interpret the argument as an old-style block name. The return value is a I<range set> with one range: an anonymous list with a single element that consists of another anonymous list whose first element is the first code point in the block, and whose second (and final) element is the final code point in the block. (The extra list consisting of just one element is so that the same program logic can be used to handle both this return, and the return from L</charscript()> which can have multiple ranges.) You can test whether a code point is in a range using the L</charinrange()> function. If the argument is not a known block, C<undef> is returned. =cut my @BLOCKS; my %BLOCKS; sub _charblocks { # Can't read from the mktables table because it loses the hyphens in the # original. unless (@BLOCKS) { if (openunicode(\$BLOCKSFH, "Blocks.txt")) { local $_; local $/ = "\n"; while (<$BLOCKSFH>) { if (/^([0-9A-F]+)\.\.([0-9A-F]+);\s+(.+)/) { my ($lo, $hi) = (hex($1), hex($2)); my $subrange = [ $lo, $hi, $3 ]; push @BLOCKS, $subrange; push @{$BLOCKS{$3}}, $subrange; } } close($BLOCKSFH); } } } sub charblock { my $arg = shift; _charblocks() unless @BLOCKS; my $code = _getcode($arg); if (defined $code) { my $result = _search(\@BLOCKS, 0, $#BLOCKS, $code); return $result if defined $result; return 'No_Block'; } elsif (exists $BLOCKS{$arg}) { return dclone $BLOCKS{$arg}; } } =head2 B<charscript()> use Unicode::UCD 'charscript'; my $charscript = charscript(0x41); my $charscript = charscript(1234); my $charscript = charscript("U+263a"); my $range = charscript('Thai'); With a L</code point argument> charscript() returns the I<script> the code point belongs to, e.g. C<Latin>, C<Greek>, C<Han>. If the code point is unassigned, it returns C<"Unknown">. If supplied with an argument that can't be a code point, charscript() tries to do the opposite and interpret the argument as a script name. The return value is a I<range set>: an anonymous list of lists that contain I<start-of-range>, I<end-of-range> code point pairs. You can test whether a code point is in a range set using the L</charinrange()> function. If the argument is not a known script, C<undef> is returned. See also L</Blocks versus Scripts>. =cut my @SCRIPTS; my %SCRIPTS; sub _charscripts { @SCRIPTS =_read_table("To/Sc.pl") unless @SCRIPTS; foreach my $entry (@SCRIPTS) { $entry->[2] =~ s/(_\w)/\L$1/g; # Preserve old-style casing push @{$SCRIPTS{$entry->[2]}}, $entry; } } sub charscript { my $arg = shift; _charscripts() unless @SCRIPTS; my $code = _getcode($arg); if (defined $code) { my $result = _search(\@SCRIPTS, 0, $#SCRIPTS, $code); return $result if defined $result; return $utf8::SwashInfo{'ToSc'}{'missing'}; } elsif (exists $SCRIPTS{$arg}) { return dclone $SCRIPTS{$arg}; } return; } =head2 B<charblocks()> use Unicode::UCD 'charblocks'; my $charblocks = charblocks(); charblocks() returns a reference to a hash with the known block names as the keys, and the code point ranges (see L</charblock()>) as the values. The names are in the old-style (see L</Old-style versus new-style block names>). L<prop_invmap("block")|/prop_invmap()> can be used to get this same data in a different type of data structure. See also L</Blocks versus Scripts>. =cut sub charblocks { _charblocks() unless %BLOCKS; return dclone \%BLOCKS; } =head2 B<charscripts()> use Unicode::UCD 'charscripts'; my $charscripts = charscripts(); charscripts() returns a reference to a hash with the known script names as the keys, and the code point ranges (see L</charscript()>) as the values. L<prop_invmap("script")|/prop_invmap()> can be used to get this same data in a different type of data structure. See also L</Blocks versus Scripts>. =cut sub charscripts { _charscripts() unless %SCRIPTS; return dclone \%SCRIPTS; } =head2 B<charinrange()> In addition to using the C<\p{Blk=...}> and C<\P{Blk=...}> constructs, you can also test whether a code point is in the I<range> as returned by L</charblock()> and L</charscript()> or as the values of the hash returned by L</charblocks()> and L</charscripts()> by using charinrange(): use Unicode::UCD qw(charscript charinrange); $range = charscript('Hiragana'); print "looks like hiragana\n" if charinrange($range, $codepoint); =cut my %GENERAL_CATEGORIES = ( 'L' => 'Letter', 'LC' => 'CasedLetter', 'Lu' => 'UppercaseLetter', 'Ll' => 'LowercaseLetter', 'Lt' => 'TitlecaseLetter', 'Lm' => 'ModifierLetter', 'Lo' => 'OtherLetter', 'M' => 'Mark', 'Mn' => 'NonspacingMark', 'Mc' => 'SpacingMark', 'Me' => 'EnclosingMark', 'N' => 'Number', 'Nd' => 'DecimalNumber', 'Nl' => 'LetterNumber', 'No' => 'OtherNumber', 'P' => 'Punctuation', 'Pc' => 'ConnectorPunctuation', 'Pd' => 'DashPunctuation', 'Ps' => 'OpenPunctuation', 'Pe' => 'ClosePunctuation', 'Pi' => 'InitialPunctuation', 'Pf' => 'FinalPunctuation', 'Po' => 'OtherPunctuation', 'S' => 'Symbol', 'Sm' => 'MathSymbol', 'Sc' => 'CurrencySymbol', 'Sk' => 'ModifierSymbol', 'So' => 'OtherSymbol', 'Z' => 'Separator', 'Zs' => 'SpaceSeparator', 'Zl' => 'LineSeparator', 'Zp' => 'ParagraphSeparator', 'C' => 'Other', 'Cc' => 'Control', 'Cf' => 'Format', 'Cs' => 'Surrogate', 'Co' => 'PrivateUse', 'Cn' => 'Unassigned', ); sub general_categories { return dclone \%GENERAL_CATEGORIES; } =head2 B<general_categories()> use Unicode::UCD 'general_categories'; my $categories = general_categories(); This returns a reference to a hash which has short general category names (such as C<Lu>, C<Nd>, C<Zs>, C<S>) as keys and long names (such as C<UppercaseLetter>, C<DecimalNumber>, C<SpaceSeparator>, C<Symbol>) as values. The hash is reversible in case you need to go from the long names to the short names. The general category is the one returned from L</charinfo()> under the C<category> key. The L</prop_value_aliases()> function can be used to get all the synonyms of the category name. =cut my %BIDI_TYPES = ( 'L' => 'Left-to-Right', 'LRE' => 'Left-to-Right Embedding', 'LRO' => 'Left-to-Right Override', 'R' => 'Right-to-Left', 'AL' => 'Right-to-Left Arabic', 'RLE' => 'Right-to-Left Embedding', 'RLO' => 'Right-to-Left Override', 'PDF' => 'Pop Directional Format', 'EN' => 'European Number', 'ES' => 'European Number Separator', 'ET' => 'European Number Terminator', 'AN' => 'Arabic Number', 'CS' => 'Common Number Separator', 'NSM' => 'Non-Spacing Mark', 'BN' => 'Boundary Neutral', 'B' => 'Paragraph Separator', 'S' => 'Segment Separator', 'WS' => 'Whitespace', 'ON' => 'Other Neutrals', ); =head2 B<bidi_types()> use Unicode::UCD 'bidi_types'; my $categories = bidi_types(); This returns a reference to a hash which has the short bidi (bidirectional) type names (such as C<L>, C<R>) as keys and long names (such as C<Left-to-Right>, C<Right-to-Left>) as values. The hash is reversible in case you need to go from the long names to the short names. The bidi type is the one returned from L</charinfo()> under the C<bidi> key. For the exact meaning of the various bidi classes the Unicode TR9 is recommended reading: L<http://www.unicode.org/reports/tr9/> (as of Unicode 5.0.0) The L</prop_value_aliases()> function can be used to get all the synonyms of the bidi type name. =cut sub bidi_types { return dclone \%BIDI_TYPES; } =head2 B<compexcl()> use Unicode::UCD 'compexcl'; my $compexcl = compexcl(0x09dc); This routine is included for backwards compatibility, but as of Perl 5.12, for most purposes it is probably more convenient to use one of the following instead: my $compexcl = chr(0x09dc) =~ /\p{Comp_Ex}; my $compexcl = chr(0x09dc) =~ /\p{Full_Composition_Exclusion}; or even my $compexcl = chr(0x09dc) =~ /\p{CE}; my $compexcl = chr(0x09dc) =~ /\p{Composition_Exclusion}; The first two forms return B<true> if the L</code point argument> should not be produced by composition normalization. For the final two forms to return B<true>, it is additionally required that this fact not otherwise be determinable from the Unicode data base. This routine behaves identically to the final two forms. That is, it does not return B<true> if the code point has a decomposition consisting of another single code point, nor if its decomposition starts with a code point whose combining class is non-zero. Code points that meet either of these conditions should also not be produced by composition normalization, which is probably why you should use the C<Full_Composition_Exclusion> property instead, as shown above. The routine returns B<false> otherwise. =cut sub compexcl { my $arg = shift; my $code = _getcode($arg); croak __PACKAGE__, "::compexcl: unknown code '$arg'" unless defined $code; no warnings "non_unicode"; # So works on non-Unicode code points return chr($code) =~ /\p{Composition_Exclusion}/; } =head2 B<casefold()> use Unicode::UCD 'casefold'; my $casefold = casefold(0xDF); if (defined $casefold) { my @full_fold_hex = split / /, $casefold->{'full'}; my $full_fold_string = join "", map {chr(hex($_))} @full_fold_hex; my @turkic_fold_hex = split / /, ($casefold->{'turkic'} ne "") ? $casefold->{'turkic'} : $casefold->{'full'}; my $turkic_fold_string = join "", map {chr(hex($_))} @turkic_fold_hex; } if (defined $casefold && $casefold->{'simple'} ne "") { my $simple_fold_hex = $casefold->{'simple'}; my $simple_fold_string = chr(hex($simple_fold_hex)); } This returns the (almost) locale-independent case folding of the character specified by the L</code point argument>. (Starting in Perl v5.16, the core function C<fc()> returns the C<full> mapping (described below) faster than this does, and for entire strings.) If there is no case folding for the input code point, C<undef> is returned. If there is a case folding for that code point, a reference to a hash with the following fields is returned: =over =item B<code> the input L</code point argument> expressed in hexadecimal, with leading zeros added if necessary to make it contain at least four hexdigits =item B<full> one or more codes (separated by spaces) that, taken in order, give the code points for the case folding for I<code>. Each has at least four hexdigits. =item B<simple> is empty, or is exactly one code with at least four hexdigits which can be used as an alternative case folding when the calling program cannot cope with the fold being a sequence of multiple code points. If I<full> is just one code point, then I<simple> equals I<full>. If there is no single code point folding defined for I<code>, then I<simple> is the empty string. Otherwise, it is an inferior, but still better-than-nothing alternative folding to I<full>. =item B<mapping> is the same as I<simple> if I<simple> is not empty, and it is the same as I<full> otherwise. It can be considered to be the simplest possible folding for I<code>. It is defined primarily for backwards compatibility. =item B<status> is C<C> (for C<common>) if the best possible fold is a single code point (I<simple> equals I<full> equals I<mapping>). It is C<S> if there are distinct folds, I<simple> and I<full> (I<mapping> equals I<simple>). And it is C<F> if there is only a I<full> fold (I<mapping> equals I<full>; I<simple> is empty). Note that this describes the contents of I<mapping>. It is defined primarily for backwards compatibility. For Unicode versions between 3.1 and 3.1.1 inclusive, I<status> can also be C<I> which is the same as C<C> but is a special case for dotted uppercase I and dotless lowercase i: =over =item B<*> If you use this C<I> mapping the result is case-insensitive, but dotless and dotted I's are not distinguished =item B<*> If you exclude this C<I> mapping the result is not fully case-insensitive, but dotless and dotted I's are distinguished =back =item B<turkic> contains any special folding for Turkic languages. For versions of Unicode starting with 3.2, this field is empty unless I<code> has a different folding in Turkic languages, in which case it is one or more codes (separated by spaces) that, taken in order, give the code points for the case folding for I<code> in those languages. Each code has at least four hexdigits. Note that this folding does not maintain canonical equivalence without additional processing. For Unicode versions between 3.1 and 3.1.1 inclusive, this field is empty unless there is a special folding for Turkic languages, in which case I<status> is C<I>, and I<mapping>, I<full>, I<simple>, and I<turkic> are all equal. =back Programs that want complete generality and the best folding results should use the folding contained in the I<full> field. But note that the fold for some code points will be a sequence of multiple code points. Programs that can't cope with the fold mapping being multiple code points can use the folding contained in the I<simple> field, with the loss of some generality. In Unicode 5.1, about 7% of the defined foldings have no single code point folding. The I<mapping> and I<status> fields are provided for backwards compatibility for existing programs. They contain the same values as in previous versions of this function. Locale is not completely independent. The I<turkic> field contains results to use when the locale is a Turkic language. For more information about case mappings see L<http://www.unicode.org/unicode/reports/tr21> =cut my %CASEFOLD; sub _casefold { unless (%CASEFOLD) { if (openunicode(\$CASEFOLDFH, "CaseFolding.txt")) { local $_; local $/ = "\n"; while (<$CASEFOLDFH>) { if (/^([0-9A-F]+); ([CFIST]); ([0-9A-F]+(?: [0-9A-F]+)*);/) { my $code = hex($1); $CASEFOLD{$code}{'code'} = $1; $CASEFOLD{$code}{'turkic'} = "" unless defined $CASEFOLD{$code}{'turkic'}; if ($2 eq 'C' || $2 eq 'I') { # 'I' is only on 3.1 and # earlier Unicodes # Both entries there (I # only checked 3.1) are # the same as C, and # there are no other # entries for those # codepoints, so treat # as if C, but override # the turkic one for # 'I'. $CASEFOLD{$code}{'status'} = $2; $CASEFOLD{$code}{'full'} = $CASEFOLD{$code}{'simple'} = $CASEFOLD{$code}{'mapping'} = $3; $CASEFOLD{$code}{'turkic'} = $3 if $2 eq 'I'; } elsif ($2 eq 'F') { $CASEFOLD{$code}{'full'} = $3; unless (defined $CASEFOLD{$code}{'simple'}) { $CASEFOLD{$code}{'simple'} = ""; $CASEFOLD{$code}{'mapping'} = $3; $CASEFOLD{$code}{'status'} = $2; } } elsif ($2 eq 'S') { # There can't be a simple without a full, and simple # overrides all but full $CASEFOLD{$code}{'simple'} = $3; $CASEFOLD{$code}{'mapping'} = $3; $CASEFOLD{$code}{'status'} = $2; } elsif ($2 eq 'T') { $CASEFOLD{$code}{'turkic'} = $3; } # else can't happen because only [CIFST] are possible } } close($CASEFOLDFH); } } } sub casefold { my $arg = shift; my $code = _getcode($arg); croak __PACKAGE__, "::casefold: unknown code '$arg'" unless defined $code; _casefold() unless %CASEFOLD; return $CASEFOLD{$code}; } =head2 B<casespec()> use Unicode::UCD 'casespec'; my $casespec = casespec(0xFB00); This returns the potentially locale-dependent case mappings of the L</code point argument>. The mappings may be longer than a single code point (which the basic Unicode case mappings as returned by L</charinfo()> never are). If there are no case mappings for the L</code point argument>, or if all three possible mappings (I<lower>, I<title> and I<upper>) result in single code points and are locale independent and unconditional, C<undef> is returned (which means that the case mappings, if any, for the code point are those returned by L</charinfo()>). Otherwise, a reference to a hash giving the mappings (or a reference to a hash of such hashes, explained below) is returned with the following keys and their meanings: The keys in the bottom layer hash with the meanings of their values are: =over =item B<code> the input L</code point argument> expressed in hexadecimal, with leading zeros added if necessary to make it contain at least four hexdigits =item B<lower> one or more codes (separated by spaces) that, taken in order, give the code points for the lower case of I<code>. Each has at least four hexdigits. =item B<title> one or more codes (separated by spaces) that, taken in order, give the code points for the title case of I<code>. Each has at least four hexdigits. =item B<upper> one or more codes (separated by spaces) that, taken in order, give the code points for the upper case of I<code>. Each has at least four hexdigits. =item B<condition> the conditions for the mappings to be valid. If C<undef>, the mappings are always valid. When defined, this field is a list of conditions, all of which must be true for the mappings to be valid. The list consists of one or more I<locales> (see below) and/or I<contexts> (explained in the next paragraph), separated by spaces. (Other than as used to separate elements, spaces are to be ignored.) Case distinctions in the condition list are not significant. Conditions preceded by "NON_" represent the negation of the condition. A I<context> is one of those defined in the Unicode standard. For Unicode 5.1, they are defined in Section 3.13 C<Default Case Operations> available at L<http://www.unicode.org/versions/Unicode5.1.0/>. These are for context-sensitive casing. =back The hash described above is returned for locale-independent casing, where at least one of the mappings has length longer than one. If C<undef> is returned, the code point may have mappings, but if so, all are length one, and are returned by L</charinfo()>. Note that when this function does return a value, it will be for the complete set of mappings for a code point, even those whose length is one. If there are additional casing rules that apply only in certain locales, an additional key for each will be defined in the returned hash. Each such key will be its locale name, defined as a 2-letter ISO 3166 country code, possibly followed by a "_" and a 2-letter ISO language code (possibly followed by a "_" and a variant code). You can find the lists of all possible locales, see L<Locale::Country> and L<Locale::Language>. (In Unicode 6.0, the only locales returned by this function are C<lt>, C<tr>, and C<az>.) Each locale key is a reference to a hash that has the form above, and gives the casing rules for that particular locale, which take precedence over the locale-independent ones when in that locale. If the only casing for a code point is locale-dependent, then the returned hash will not have any of the base keys, like C<code>, C<upper>, etc., but will contain only locale keys. For more information about case mappings see L<http://www.unicode.org/unicode/reports/tr21/> =cut my %CASESPEC; sub _casespec { unless (%CASESPEC) { if (openunicode(\$CASESPECFH, "SpecialCasing.txt")) { local $_; local $/ = "\n"; while (<$CASESPECFH>) { if (/^([0-9A-F]+); ([0-9A-F]+(?: [0-9A-F]+)*)?; ([0-9A-F]+(?: [0-9A-F]+)*)?; ([0-9A-F]+(?: [0-9A-F]+)*)?; (\w+(?: \w+)*)?/) { my ($hexcode, $lower, $title, $upper, $condition) = ($1, $2, $3, $4, $5); my $code = hex($hexcode); if (exists $CASESPEC{$code}) { if (exists $CASESPEC{$code}->{code}) { my ($oldlower, $oldtitle, $oldupper, $oldcondition) = @{$CASESPEC{$code}}{qw(lower title upper condition)}; if (defined $oldcondition) { my ($oldlocale) = ($oldcondition =~ /^([a-z][a-z](?:_\S+)?)/); delete $CASESPEC{$code}; $CASESPEC{$code}->{$oldlocale} = { code => $hexcode, lower => $oldlower, title => $oldtitle, upper => $oldupper, condition => $oldcondition }; } } my ($locale) = ($condition =~ /^([a-z][a-z](?:_\S+)?)/); $CASESPEC{$code}->{$locale} = { code => $hexcode, lower => $lower, title => $title, upper => $upper, condition => $condition }; } else { $CASESPEC{$code} = { code => $hexcode, lower => $lower, title => $title, upper => $upper, condition => $condition }; } } } close($CASESPECFH); } } } sub casespec { my $arg = shift; my $code = _getcode($arg); croak __PACKAGE__, "::casespec: unknown code '$arg'" unless defined $code; _casespec() unless %CASESPEC; return ref $CASESPEC{$code} ? dclone $CASESPEC{$code} : $CASESPEC{$code}; } =head2 B<namedseq()> use Unicode::UCD 'namedseq'; my $namedseq = namedseq("KATAKANA LETTER AINU P"); my @namedseq = namedseq("KATAKANA LETTER AINU P"); my %namedseq = namedseq(); If used with a single argument in a scalar context, returns the string consisting of the code points of the named sequence, or C<undef> if no named sequence by that name exists. If used with a single argument in a list context, it returns the list of the ordinals of the code points. If used with no arguments in a list context, returns a hash with the names of the named sequences as the keys and the named sequences as strings as the values. Otherwise, it returns C<undef> or an empty list depending on the context. This function only operates on officially approved (not provisional) named sequences. Note that as of Perl 5.14, C<\N{KATAKANA LETTER AINU P}> will insert the named sequence into double-quoted strings, and C<charnames::string_vianame("KATAKANA LETTER AINU P")> will return the same string this function does, but will also operate on character names that aren't named sequences, without you having to know which are which. See L<charnames>. =cut my %NAMEDSEQ; sub _namedseq { unless (%NAMEDSEQ) { if (openunicode(\$NAMEDSEQFH, "Name.pl")) { local $_; local $/ = "\n"; while (<$NAMEDSEQFH>) { if (/^ [0-9A-F]+ \ /x) { chomp; my ($sequence, $name) = split /\t/; my @s = map { chr(hex($_)) } split(' ', $sequence); $NAMEDSEQ{$name} = join("", @s); } } close($NAMEDSEQFH); } } } sub namedseq { # Use charnames::string_vianame() which now returns this information, # unless the caller wants the hash returned, in which case we read it in, # and thereafter use it instead of calling charnames, as it is faster. my $wantarray = wantarray(); if (defined $wantarray) { if ($wantarray) { if (@_ == 0) { _namedseq() unless %NAMEDSEQ; return %NAMEDSEQ; } elsif (@_ == 1) { my $s; if (%NAMEDSEQ) { $s = $NAMEDSEQ{ $_[0] }; } else { $s = charnames::string_vianame($_[0]); } return defined $s ? map { ord($_) } split('', $s) : (); } } elsif (@_ == 1) { return $NAMEDSEQ{ $_[0] } if %NAMEDSEQ; return charnames::string_vianame($_[0]); } } return; } my %NUMERIC; sub _numeric { # Unicode 6.0 instituted the rule that only digits in a consecutive # block of 10 would be considered decimal digits. Before that, the only # problematic code point that I'm (khw) aware of is U+019DA, NEW TAI LUE # THAM DIGIT ONE, which is an alternate form of U+019D1, NEW TAI LUE DIGIT # ONE. The code could be modified to handle that, but not bothering, as # in TUS 6.0, U+19DA was changed to Nt=Di. if ((pack "C*", split /\./, UnicodeVersion()) lt 6.0.0) { croak __PACKAGE__, "::num requires Unicode 6.0 or greater" } my @numbers = _read_table("To/Nv.pl"); foreach my $entry (@numbers) { my ($start, $end, $value) = @$entry; # If value contains a slash, convert to decimal, add a reverse hash # used by charinfo. if ((my @rational = split /\//, $value) == 2) { my $real = $rational[0] / $rational[1]; $real_to_rational{$real} = $value; $value = $real; # Should only be single element, but just in case... for my $i ($start .. $end) { $NUMERIC{$i} = $value; } } else { # The values require adjusting, as is in 'a' format for my $i ($start .. $end) { $NUMERIC{$i} = $value + $i - $start; } } } # Decided unsafe to use these that aren't officially part of the Unicode # standard. #use Math::Trig; #my $pi = acos(-1.0); #$NUMERIC{0x03C0} = $pi; # Euler's constant, not to be confused with Euler's number #$NUMERIC{0x2107} = 0.57721566490153286060651209008240243104215933593992; # Euler's number #$NUMERIC{0x212F} = 2.7182818284590452353602874713526624977572; return; } =pod =head2 B<num()> use Unicode::UCD 'num'; my $val = num("123"); my $one_quarter = num("\N{VULGAR FRACTION 1/4}"); C<num> returns the numeric value of the input Unicode string; or C<undef> if it doesn't think the entire string has a completely valid, safe numeric value. If the string is just one character in length, the Unicode numeric value is returned if it has one, or C<undef> otherwise. Note that this need not be a whole number. C<num("\N{TIBETAN DIGIT HALF ZERO}")>, for example returns -0.5. =cut #A few characters to which Unicode doesn't officially #assign a numeric value are considered numeric by C<num>. #These are: # EULER CONSTANT 0.5772... (this is NOT Euler's number) # SCRIPT SMALL E 2.71828... (this IS Euler's number) # GREEK SMALL LETTER PI 3.14159... =pod If the string is more than one character, C<undef> is returned unless all its characters are decimal digits (that is, they would match C<\d+>), from the same script. For example if you have an ASCII '0' and a Bengali '3', mixed together, they aren't considered a valid number, and C<undef> is returned. A further restriction is that the digits all have to be of the same form. A half-width digit mixed with a full-width one will return C<undef>. The Arabic script has two sets of digits; C<num> will return C<undef> unless all the digits in the string come from the same set. C<num> errs on the side of safety, and there may be valid strings of decimal digits that it doesn't recognize. Note that Unicode defines a number of "digit" characters that aren't "decimal digit" characters. "Decimal digits" have the property that they have a positional value, i.e., there is a units position, a 10's position, a 100's, etc, AND they are arranged in Unicode in blocks of 10 contiguous code points. The Chinese digits, for example, are not in such a contiguous block, and so Unicode doesn't view them as decimal digits, but merely digits, and so C<\d> will not match them. A single-character string containing one of these digits will have its decimal value returned by C<num>, but any longer string containing only these digits will return C<undef>. Strings of multiple sub- and superscripts are not recognized as numbers. You can use either of the compatibility decompositions in Unicode::Normalize to change these into digits, and then call C<num> on the result. =cut # To handle sub, superscripts, this could if called in list context, # consider those, and return the <decomposition> type in the second # array element. sub num { my $string = $_[0]; _numeric unless %NUMERIC; my $length = length($string); return $NUMERIC{ord($string)} if $length == 1; return if $string =~ /\D/; my $first_ord = ord(substr($string, 0, 1)); my $value = $NUMERIC{$first_ord}; my $zero_ord = $first_ord - $value; for my $i (1 .. $length -1) { my $ord = ord(substr($string, $i, 1)); my $digit = $ord - $zero_ord; return unless $digit >= 0 && $digit <= 9; $value = $value * 10 + $digit; } return $value; } =pod =head2 B<prop_aliases()> use Unicode::UCD 'prop_aliases'; my ($short_name, $full_name, @other_names) = prop_aliases("space"); my $same_full_name = prop_aliases("Space"); # Scalar context my ($same_short_name) = prop_aliases("Space"); # gets 0th element print "The full name is $full_name\n"; print "The short name is $short_name\n"; print "The other aliases are: ", join(", ", @other_names), "\n"; prints: The full name is White_Space The short name is WSpace The other aliases are: Space Most Unicode properties have several synonymous names. Typically, there is at least a short name, convenient to type, and a long name that more fully describes the property, and hence is more easily understood. If you know one name for a Unicode property, you can use C<prop_aliases> to find either the long name (when called in scalar context), or a list of all of the names, somewhat ordered so that the short name is in the 0th element, the long name in the next element, and any other synonyms are in the remaining elements, in no particular order. The long name is returned in a form nicely capitalized, suitable for printing. The input parameter name is loosely matched, which means that white space, hyphens, and underscores are ignored (except for the trailing underscore in the old_form grandfathered-in C<"L_">, which is better written as C<"LC">, and both of which mean C<General_Category=Cased Letter>). If the name is unknown, C<undef> is returned (or an empty list in list context). Note that Perl typically recognizes property names in regular expressions with an optional C<"Is_>" (with or without the underscore) prefixed to them, such as C<\p{isgc=punct}>. This function does not recognize those in the input, returning C<undef>. Nor are they included in the output as possible synonyms. C<prop_aliases> does know about the Perl extensions to Unicode properties, such as C<Any> and C<XPosixAlpha>, and the single form equivalents to Unicode properties such as C<XDigit>, C<Greek>, C<In_Greek>, and C<Is_Greek>. The final example demonstrates that the C<"Is_"> prefix is recognized for these extensions; it is needed to resolve ambiguities. For example, C<prop_aliases('lc')> returns the list C<(lc, Lowercase_Mapping)>, but C<prop_aliases('islc')> returns C<(Is_LC, Cased_Letter)>. This is because C<islc> is a Perl extension which is short for C<General_Category=Cased Letter>. The lists returned for the Perl extensions will not include the C<"Is_"> prefix (whether or not the input had it) unless needed to resolve ambiguities, as shown in the C<"islc"> example, where the returned list had one element containing C<"Is_">, and the other without. It is also possible for the reverse to happen: C<prop_aliases('isc')> returns the list C<(isc, ISO_Comment)>; whereas C<prop_aliases('c')> returns C<(C, Other)> (the latter being a Perl extension meaning C<General_Category=Other>. L<perluniprops/Properties accessible through Unicode::UCD> lists the available forms, including which ones are discouraged from use. Those discouraged forms are accepted as input to C<prop_aliases>, but are not returned in the lists. C<prop_aliases('isL&')> and C<prop_aliases('isL_')>, which are old synonyms for C<"Is_LC"> and should not be used in new code, are examples of this. These both return C<(Is_LC, Cased_Letter)>. Thus this function allows you to take a discourarged form, and find its acceptable alternatives. The same goes with single-form Block property equivalences. Only the forms that begin with C<"In_"> are not discouraged; if you pass C<prop_aliases> a discouraged form, you will get back the equivalent ones that begin with C<"In_">. It will otherwise look like a new-style block name (see. L</Old-style versus new-style block names>). C<prop_aliases> does not know about any user-defined properties, and will return C<undef> if called with one of those. Likewise for Perl internal properties, with the exception of "Perl_Decimal_Digit" which it does know about (and which is documented below in L</prop_invmap()>). =cut # It may be that there are use cases where the discouraged forms should be # returned. If that comes up, an optional boolean second parameter to the # function could be created, for example. # These are created by mktables for this routine and stored in unicore/UCD.pl # where their structures are described. our %string_property_loose_to_name; our %ambiguous_names; our %loose_perlprop_to_name; our %prop_aliases; sub prop_aliases ($) { my $prop = $_[0]; return unless defined $prop; require "unicore/UCD.pl"; require "unicore/Heavy.pl"; require "utf8_heavy.pl"; # The property name may be loosely or strictly matched; we don't know yet. # But both types use lower-case. $prop = lc $prop; # It is loosely matched if its lower case isn't known to be strict. my $list_ref; if (! exists $utf8::stricter_to_file_of{$prop}) { my $loose = utf8::_loose_name($prop); # There is a hash that converts from any loose name to its standard # form, mapping all synonyms for a name to one name that can be used # as a key into another hash. The whole concept is for memory # savings, as the second hash doesn't have to have all the # combinations. Actually, there are two hashes that do the # converstion. One is used in utf8_heavy.pl (stored in Heavy.pl) for # looking up properties matchable in regexes. This function needs to # access string properties, which aren't available in regexes, so a # second conversion hash is made for them (stored in UCD.pl). Look in # the string one now, as the rest can have an optional 'is' prefix, # which these don't. if (exists $string_property_loose_to_name{$loose}) { # Convert to its standard loose name. $prop = $string_property_loose_to_name{$loose}; } else { my $retrying = 0; # bool. ? Has an initial 'is' been stripped RETRY: if (exists $utf8::loose_property_name_of{$loose} && (! $retrying || ! exists $ambiguous_names{$loose})) { # Found an entry giving the standard form. We don't get here # (in the test above) when we've stripped off an # 'is' and the result is an ambiguous name. That is because # these are official Unicode properties (though Perl can have # an optional 'is' prefix meaning the official property), and # all ambiguous cases involve a Perl single-form extension # for the gc, script, or block properties, and the stripped # 'is' means that they mean one of those, and not one of # these $prop = $utf8::loose_property_name_of{$loose}; } elsif (exists $loose_perlprop_to_name{$loose}) { # This hash is specifically for this function to list Perl # extensions that aren't in the earlier hashes. If there is # only one element, the short and long names are identical. # Otherwise the form is already in the same form as # %prop_aliases, which is handled at the end of the function. $list_ref = $loose_perlprop_to_name{$loose}; if (@$list_ref == 1) { my @list = ($list_ref->[0], $list_ref->[0]); $list_ref = \@list; } } elsif (! exists $utf8::loose_to_file_of{$loose}) { # loose_to_file_of is a complete list of loose names. If not # there, the input is unknown. return; } else { # Here we found the name but not its aliases, so it has to # exist. This means it must be one of the Perl single-form # extensions. First see if it is for a property-value # combination in one of the following properties. my @list; foreach my $property ("gc", "script") { @list = prop_value_aliases($property, $loose); last if @list; } if (@list) { # Here, it is one of those property-value combination # single-form synonyms. There are ambiguities with some # of these. Check against the list for these, and adjust # if necessary. for my $i (0 .. @list -1) { if (exists $ambiguous_names {utf8::_loose_name(lc $list[$i])}) { # The ambiguity is resolved by toggling whether or # not it has an 'is' prefix $list[$i] =~ s/^Is_// or $list[$i] =~ s/^/Is_/; } } return @list; } # Here, it wasn't one of the gc or script single-form # extensions. It could be a block property single-form # extension. An 'in' prefix definitely means that, and should # be looked up without the prefix. However, starting in # Unicode 6.1, we have to special case 'indic...', as there # is a property that begins with that name. We shouldn't # strip the 'in' from that. I'm (khw) generalizing this to # 'indic' instead of the single property, because I suspect # that others of this class may come along in the future. # However, this could backfire and a block created whose name # begins with 'dic...', and we would want to strip the 'in'. # At which point this would have to be tweaked. my $began_with_in = $loose =~ s/^in(?!dic)//; @list = prop_value_aliases("block", $loose); if (@list) { map { $_ =~ s/^/In_/ } @list; return @list; } # Here still haven't found it. The last opportunity for it # being valid is only if it began with 'is'. We retry without # the 'is', setting a flag to that effect so that we don't # accept things that begin with 'isis...' if (! $retrying && ! $began_with_in && $loose =~ s/^is//) { $retrying = 1; goto RETRY; } # Here, didn't find it. Since it was in %loose_to_file_of, we # should have been able to find it. carp __PACKAGE__, "::prop_aliases: Unexpectedly could not find '$prop'. Send bug report to perlbug\@perl.org"; return; } } } if (! $list_ref) { # Here, we have set $prop to a standard form name of the input. Look # it up in the structure created by mktables for this purpose, which # contains both strict and loosely matched properties. Avoid # autovivifying. $list_ref = $prop_aliases{$prop} if exists $prop_aliases{$prop}; return unless $list_ref; } # The full name is in element 1. return $list_ref->[1] unless wantarray; return @{dclone $list_ref}; } =pod =head2 B<prop_value_aliases()> use Unicode::UCD 'prop_value_aliases'; my ($short_name, $full_name, @other_names) = prop_value_aliases("Gc", "Punct"); my $same_full_name = prop_value_aliases("Gc", "P"); # Scalar cntxt my ($same_short_name) = prop_value_aliases("Gc", "P"); # gets 0th # element print "The full name is $full_name\n"; print "The short name is $short_name\n"; print "The other aliases are: ", join(", ", @other_names), "\n"; prints: The full name is Punctuation The short name is P The other aliases are: Punct Some Unicode properties have a restricted set of legal values. For example, all binary properties are restricted to just C<true> or C<false>; and there are only a few dozen possible General Categories. For such properties, there are usually several synonyms for each possible value. For example, in binary properties, I<truth> can be represented by any of the strings "Y", "Yes", "T", or "True"; and the General Category "Punctuation" by that string, or "Punct", or simply "P". Like property names, there is typically at least a short name for each such property-value, and a long name. If you know any name of the property-value, you can use C<prop_value_aliases>() to get the long name (when called in scalar context), or a list of all the names, with the short name in the 0th element, the long name in the next element, and any other synonyms in the remaining elements, in no particular order, except that any all-numeric synonyms will be last. The long name is returned in a form nicely capitalized, suitable for printing. Case, white space, hyphens, and underscores are ignored in the input parameters (except for the trailing underscore in the old-form grandfathered-in general category property value C<"L_">, which is better written as C<"LC">). If either name is unknown, C<undef> is returned. Note that Perl typically recognizes property names in regular expressions with an optional C<"Is_>" (with or without the underscore) prefixed to them, such as C<\p{isgc=punct}>. This function does not recognize those in the property parameter, returning C<undef>. If called with a property that doesn't have synonyms for its values, it returns the input value, possibly normalized with capitalization and underscores. For the block property, new-style block names are returned (see L</Old-style versus new-style block names>). To find the synonyms for single-forms, such as C<\p{Any}>, use L</prop_aliases()> instead. C<prop_value_aliases> does not know about any user-defined properties, and will return C<undef> if called with one of those. =cut # These are created by mktables for this routine and stored in unicore/UCD.pl # where their structures are described. our %loose_to_standard_value; our %prop_value_aliases; sub prop_value_aliases ($$) { my ($prop, $value) = @_; return unless defined $prop && defined $value; require "unicore/UCD.pl"; require "utf8_heavy.pl"; # Find the property name synonym that's used as the key in other hashes, # which is element 0 in the returned list. ($prop) = prop_aliases($prop); return if ! $prop; $prop = utf8::_loose_name(lc $prop); # Here is a legal property, but the hash below (created by mktables for # this purpose) only knows about the properties that have a very finite # number of potential values, that is not ones whose value could be # anything, like most (if not all) string properties. These don't have # synonyms anyway. Simply return the input. For example, there is no # synonym for ('Uppercase_Mapping', A'). return $value if ! exists $prop_value_aliases{$prop}; # The value name may be loosely or strictly matched; we don't know yet. # But both types use lower-case. $value = lc $value; # If the name isn't found under loose matching, it certainly won't be # found under strict my $loose_value = utf8::_loose_name($value); return unless exists $loose_to_standard_value{"$prop=$loose_value"}; # Similarly if the combination under loose matching doesn't exist, it # won't exist under strict. my $standard_value = $loose_to_standard_value{"$prop=$loose_value"}; return unless exists $prop_value_aliases{$prop}{$standard_value}; # Here we did find a combination under loose matching rules. But it could # be that is a strict property match that shouldn't have matched. # %prop_value_aliases is set up so that the strict matches will appear as # if they were in loose form. Thus, if the non-loose version is legal, # we're ok, can skip the further check. if (! exists $utf8::stricter_to_file_of{"$prop=$value"} # We're also ok and skip the further check if value loosely matches. # mktables has verified that no strict name under loose rules maps to # an existing loose name. This code relies on the very limited # circumstances that strict names can be here. Strict name matching # happens under two conditions: # 1) when the name begins with an underscore. But this function # doesn't accept those, and %prop_value_aliases doesn't have # them. # 2) When the values are numeric, in which case we need to look # further, but their squeezed-out loose values will be in # %stricter_to_file_of && exists $utf8::stricter_to_file_of{"$prop=$loose_value"}) { # The only thing that's legal loosely under strict is that can have an # underscore between digit pairs XXX while ($value =~ s/(\d)_(\d)/$1$2/g) {} return unless exists $utf8::stricter_to_file_of{"$prop=$value"}; } # Here, we know that the combination exists. Return it. my $list_ref = $prop_value_aliases{$prop}{$standard_value}; if (@$list_ref > 1) { # The full name is in element 1. return $list_ref->[1] unless wantarray; return @{dclone $list_ref}; } return $list_ref->[0] unless wantarray; # Only 1 element means that it repeats return ( $list_ref->[0], $list_ref->[0] ); } # All 1 bits is the largest possible UV. $Unicode::UCD::MAX_CP = ~0; =pod =head2 B<prop_invlist()> C<prop_invlist> returns an inversion list (described below) that defines all the code points for the binary Unicode property (or "property=value" pair) given by the input parameter string: use feature 'say'; use Unicode::UCD 'prop_invlist'; say join ", ", prop_invlist("Any"); prints: 0, 1114112 An empty list is returned if the input is unknown; the number of elements in the list is returned if called in scalar context. L<perluniprops|perluniprops/Properties accessible through \p{} and \P{}> gives the list of properties that this function accepts, as well as all the possible forms for them (including with the optional "Is_" prefixes). (Except this function doesn't accept any Perl-internal properties, some of which are listed there.) This function uses the same loose or tighter matching rules for resolving the input property's name as is done for regular expressions. These are also specified in L<perluniprops|perluniprops/Properties accessible through \p{} and \P{}>. Examples of using the "property=value" form are: say join ", ", prop_invlist("Script=Shavian"); prints: 66640, 66688 say join ", ", prop_invlist("ASCII_Hex_Digit=No"); prints: 0, 48, 58, 65, 71, 97, 103 say join ", ", prop_invlist("ASCII_Hex_Digit=Yes"); prints: 48, 58, 65, 71, 97, 103 Inversion lists are a compact way of specifying Unicode property-value definitions. The 0th item in the list is the lowest code point that has the property-value. The next item (item [1]) is the lowest code point beyond that one that does NOT have the property-value. And the next item beyond that ([2]) is the lowest code point beyond that one that does have the property-value, and so on. Put another way, each element in the list gives the beginning of a range that has the property-value (for even numbered elements), or doesn't have the property-value (for odd numbered elements). The name for this data structure stems from the fact that each element in the list toggles (or inverts) whether the corresponding range is or isn't on the list. In the final example above, the first ASCII Hex digit is code point 48, the character "0", and all code points from it through 57 (a "9") are ASCII hex digits. Code points 58 through 64 aren't, but 65 (an "A") through 70 (an "F") are, as are 97 ("a") through 102 ("f"). 103 starts a range of code points that aren't ASCII hex digits. That range extends to infinity, which on your computer can be found in the variable C<$Unicode::UCD::MAX_CP>. (This variable is as close to infinity as Perl can get on your platform, and may be too high for some operations to work; you may wish to use a smaller number for your purposes.) Note that the inversion lists returned by this function can possibly include non-Unicode code points, that is anything above 0x10FFFF. This is in contrast to Perl regular expression matches on those code points, in which a non-Unicode code point always fails to match. For example, both of these have the same result: chr(0x110000) =~ \p{ASCII_Hex_Digit=True} # Fails. chr(0x110000) =~ \p{ASCII_Hex_Digit=False} # Fails! And both raise a warning that a Unicode property is being used on a non-Unicode code point. It is arguable as to which is the correct thing to do here. This function has chosen the way opposite to the Perl regular expression behavior. This allows you to easily flip to to the Perl regular expression way (for you to go in the other direction would be far harder). Simply add 0x110000 at the end of the non-empty returned list if it isn't already that value; and pop that value if it is; like: my @list = prop_invlist("foo"); if (@list) { if ($list[-1] == 0x110000) { pop @list; # Defeat the turning on for above Unicode } else { push @list, 0x110000; # Turn off for above Unicode } } It is a simple matter to expand out an inversion list to a full list of all code points that have the property-value: my @invlist = prop_invlist($property_name); die "empty" unless @invlist; my @full_list; for (my $i = 0; $i < @invlist; $i += 2) { my $upper = ($i + 1) < @invlist ? $invlist[$i+1] - 1 # In range : $Unicode::UCD::MAX_CP; # To infinity. You may want # to stop much much earlier; # going this high may expose # perl deficiencies with very # large numbers. for my $j ($invlist[$i] .. $upper) { push @full_list, $j; } } C<prop_invlist> does not know about any user-defined nor Perl internal-only properties, and will return C<undef> if called with one of those. =cut # User-defined properties could be handled with some changes to utf8_heavy.pl; # and implementing here of dealing with EXTRAS. If done, consideration should # be given to the fact that the user subroutine could return different results # with each call; security issues need to be thought about. # These are created by mktables for this routine and stored in unicore/UCD.pl # where their structures are described. our %loose_defaults; our $MAX_UNICODE_CODEPOINT; sub prop_invlist ($) { my $prop = $_[0]; return if ! defined $prop; require "utf8_heavy.pl"; # Warnings for these are only for regexes, so not applicable to us no warnings 'deprecated'; # Get the swash definition of the property-value. my $swash = utf8::SWASHNEW(__PACKAGE__, $prop, undef, 1, 0); # Fail if not found, or isn't a boolean property-value, or is a # user-defined property, or is internal-only. return if ! $swash || ref $swash eq "" || $swash->{'BITS'} != 1 || $swash->{'USER_DEFINED'} || $prop =~ /^\s*_/; if ($swash->{'EXTRAS'}) { carp __PACKAGE__, "::prop_invlist: swash returned for $prop unexpectedly has EXTRAS magic"; return; } if ($swash->{'SPECIALS'}) { carp __PACKAGE__, "::prop_invlist: swash returned for $prop unexpectedly has SPECIALS magic"; return; } my @invlist; # The input lines look like: # 0041\t005A # [26] # 005F # Split into lines, stripped of trailing comments foreach my $range (split "\n", $swash->{'LIST'} =~ s/ \s* (?: \# .* )? $ //xmgr) { # And find the beginning and end of the range on the line my ($hex_begin, $hex_end) = split "\t", $range; my $begin = hex $hex_begin; # If the new range merely extends the old, we remove the marker # created the last time through the loop for the old's end, which # causes the new one's end to be used instead. if (@invlist && $begin == $invlist[-1]) { pop @invlist; } else { # Add the beginning of the range push @invlist, $begin; } if (defined $hex_end) { # The next item starts with the code point 1 # beyond the end of the range. push @invlist, hex($hex_end) + 1; } else { # No end of range, is a single code point. push @invlist, $begin + 1; } } require "unicore/UCD.pl"; my $FIRST_NON_UNICODE = $MAX_UNICODE_CODEPOINT + 1; # Could need to be inverted: add or subtract a 0 at the beginning of the # list. And to keep it from matching non-Unicode, add or subtract the # first non-unicode code point. if ($swash->{'INVERT_IT'}) { if (@invlist && $invlist[0] == 0) { shift @invlist; } else { unshift @invlist, 0; } if (@invlist && $invlist[-1] == $FIRST_NON_UNICODE) { pop @invlist; } else { push @invlist, $FIRST_NON_UNICODE; } } # Here, the list is set up to include only Unicode code points. But, if # the table is the default one for the property, it should contain all # non-Unicode code points. First calculate the loose name for the # property. This is done even for strict-name properties, as the data # structure that mktables generates for us is set up so that we don't have # to worry about that. The property-value needs to be split if compound, # as the loose rules need to be independently calculated on each part. We # know that it is syntactically valid, or SWASHNEW would have failed. $prop = lc $prop; my ($prop_only, $table) = split /\s*[:=]\s*/, $prop; if ($table) { # May have optional prefixed 'is' $prop = utf8::_loose_name($prop_only) =~ s/^is//r; $prop = $utf8::loose_property_name_of{$prop}; $prop .= "=" . utf8::_loose_name($table); } else { $prop = utf8::_loose_name($prop); } if (exists $loose_defaults{$prop}) { # Here, is the default table. If a range ended with 10ffff, instead # continue that range to infinity, by popping the 110000; otherwise, # add the range from 11000 to infinity if (! @invlist || $invlist[-1] != $FIRST_NON_UNICODE) { push @invlist, $FIRST_NON_UNICODE; } else { pop @invlist; } } return @invlist; } sub _search_invlist { # Find the range in the inversion list which contains a code point; that # is, find i such that l[i] <= code_point < l[i+1] # If this is ever made public, could use to speed up .t specials. Would # need to use code point argument, as in other functions in this pm my $list_ref = shift; my $code_point = shift; # Verify non-neg numeric XXX my $max_element = @$list_ref - 1; return if ! $max_element < 0; # Undef if list is empty. # Short cut something at the far-end of the table. This also allows us to # refer to element [$i+1] without fear of being out-of-bounds in the loop # below. return $max_element if $code_point >= $list_ref->[$max_element]; use integer; # want integer division my $i = $max_element / 2; my $lower = 0; my $upper = $max_element; while (1) { if ($code_point >= $list_ref->[$i]) { # Here we have met the lower constraint. We can quit if we # also meet the upper one. last if $code_point < $list_ref->[$i+1]; $lower = $i; # Still too low. } else { # Here, $code_point < $list_ref[$i], so look lower down. $upper = $i; } # Split search domain in half to try again. my $temp = ($upper + $lower) / 2; # No point in continuing unless $i changes for next time # in the loop. return $i if $temp == $i; $i = $temp; } # End of while loop # Here we have found the offset return $i; } =pod =head2 B<prop_invmap()> use Unicode::UCD 'prop_invmap'; my ($list_ref, $map_ref, $format, $missing) = prop_invmap("General Category"); C<prop_invmap> is used to get the complete mapping definition for a property, in the form of an inversion map. An inversion map consists of two parallel arrays. One is an ordered list of code points that mark range beginnings, and the other gives the value (or mapping) that all code points in the corresponding range have. C<prop_invmap> is called with the name of the desired property. The name is loosely matched, meaning that differences in case, white-space, hyphens, and underscores are not meaningful (except for the trailing underscore in the old-form grandfathered-in property C<"L_">, which is better written as C<"LC">, or even better, C<"Gc=LC">). Many Unicode properties have more than one name (or alias). C<prop_invmap> understands all of these, including Perl extensions to them. Ambiguities are resolved as described above for L</prop_aliases()>. The Perl internal property "Perl_Decimal_Digit, described below, is also accepted. C<undef> is returned if the property name is unknown. See L<perluniprops/Properties accessible through Unicode::UCD> for the properties acceptable as inputs to this function. It is a fatal error to call this function except in list context. In addition to the the two arrays that form the inversion map, C<prop_invmap> returns two other values; one is a scalar that gives some details as to the format of the entries of the map array; the other is used for specialized purposes, described at the end of this section. This means that C<prop_invmap> returns a 4 element list. For example, my ($blocks_ranges_ref, $blocks_maps_ref, $format, $default) = prop_invmap("Block"); In this call, the two arrays will be populated as shown below (for Unicode 6.0): Index @blocks_ranges @blocks_maps 0 0x0000 Basic Latin 1 0x0080 Latin-1 Supplement 2 0x0100 Latin Extended-A 3 0x0180 Latin Extended-B 4 0x0250 IPA Extensions 5 0x02B0 Spacing Modifier Letters 6 0x0300 Combining Diacritical Marks 7 0x0370 Greek and Coptic 8 0x0400 Cyrillic ... 233 0x2B820 No_Block 234 0x2F800 CJK Compatibility Ideographs Supplement 235 0x2FA20 No_Block 236 0xE0000 Tags 237 0xE0080 No_Block 238 0xE0100 Variation Selectors Supplement 239 0xE01F0 No_Block 240 0xF0000 Supplementary Private Use Area-A 241 0x100000 Supplementary Private Use Area-B 242 0x110000 No_Block The first line (with Index [0]) means that the value for code point 0 is "Basic Latin". The entry "0x0080" in the @blocks_ranges column in the second line means that the value from the first line, "Basic Latin", extends to all code points in the range from 0 up to but not including 0x0080, that is, through 127. In other words, the code points from 0 to 127 are all in the "Basic Latin" block. Similarly, all code points in the range from 0x0080 up to (but not including) 0x0100 are in the block named "Latin-1 Supplement", etc. (Notice that the return is the old-style block names; see L</Old-style versus new-style block names>). The final line (with Index [242]) means that the value for all code points above the legal Unicode maximum code point have the value "No_Block", which is the term Unicode uses for a non-existing block. The arrays completely specify the mappings for all possible code points. The final element in an inversion map returned by this function will always be for the range that consists of all the code points that aren't legal Unicode, but that are expressible on the platform. (That is, it starts with code point 0x110000, the first code point above the legal Unicode maximum, and extends to infinity.) The value for that range will be the same that any typical unassigned code point has for the specified property. (Certain unassigned code points are not "typical"; for example the non-character code points, or those in blocks that are to be written right-to-left. The above-Unicode range's value is not based on these atypical code points.) It could be argued that, instead of treating these as unassigned Unicode code points, the value for this range should be C<undef>. If you wish, you can change the returned arrays accordingly. The maps are almost always simple scalars that should be interpreted as-is. These values are those given in the Unicode-supplied data files, which may be inconsistent as to capitalization and as to which synonym for a property-value is given. The results may be normalized by using the L</prop_value_aliases()> function. There are exceptions to the simple scalar maps. Some properties have some elements in their map list that are themselves lists of scalars; and some special strings are returned that are not to be interpreted as-is. Element [2] (placed into C<$format> in the example above) of the returned four element list tells you if the map has any of these special elements or not, as follows: =over =item B<C<s>> means all the elements of the map array are simple scalars, with no special elements. Almost all properties are like this, like the C<block> example above. =item B<C<sl>> means that some of the map array elements have the form given by C<"s">, and the rest are lists of scalars. For example, here is a portion of the output of calling C<prop_invmap>() with the "Script Extensions" property: @scripts_ranges @scripts_maps ... 0x0953 Devanagari 0x0964 [ Bengali, Devanagari, Gurumukhi, Oriya ] 0x0966 Devanagari 0x0970 Common Here, the code points 0x964 and 0x965 are both used in Bengali, Devanagari, Gurmukhi, and Oriya, but no other scripts. The Name_Alias property is also of this form. But each scalar consists of two components: 1) the name, and 2) the type of alias this is. They are separated by a colon and a space. In Unicode 6.1, there are several alias types: =over =item C<correction> indicates that the name is a corrected form for the original name (which remains valid) for the same code point. =item C<control> adds a new name for a control character. =item C<alternate> is an alternate name for a character =item C<figment> is a name for a character that has been documented but was never in any actual standard. =item C<abbreviation> is a common abbreviation for a character =back The lists are ordered (roughly) so the most preferred names come before less preferred ones. For example, @aliases_ranges @alias_maps ... 0x009E [ 'PRIVACY MESSAGE: control', 'PM: abbreviation' ] 0x009F [ 'APPLICATION PROGRAM COMMAND: control', 'APC: abbreviation' ] 0x00A0 'NBSP: abbreviation' 0x00A1 "" 0x00AD 'SHY: abbreviation' 0x00AE "" 0x01A2 'LATIN CAPITAL LETTER GHA: correction' 0x01A3 'LATIN SMALL LETTER GHA: correction' 0x01A4 "" ... A map to the empty string means that there is no alias defined for the code point. =item B<C<a>> is like C<"s"> in that all the map array elements are scalars, but here they are restricted to all being integers, and some have to be adjusted (hence the name C<"a">) to get the correct result. For example, in: my ($uppers_ranges_ref, $uppers_maps_ref, $format) = prop_invmap("Simple_Uppercase_Mapping"); the returned arrays look like this: @$uppers_ranges_ref @$uppers_maps_ref Note 0 0 97 65 'a' maps to 'A', b => B ... 123 0 181 924 MICRO SIGN => Greek Cap MU 182 0 ... Let's start with the second line. It says that the uppercase of code point 97 is 65; or C<uc("a")> == "A". But the line is for the entire range of code points 97 through 122. To get the mapping for any code point in a range, you take the offset it has from the beginning code point of the range, and add that to the mapping for that first code point. So, the mapping for 122 ("z") is derived by taking the offset of 122 from 97 (=25) and adding that to 65, yielding 90 ("z"). Likewise for everything in between. The first line works the same way. The first map in a range is always the correct value for its code point (because the adjustment is 0). Thus the C<uc(chr(0))> is just itself. Also, C<uc(chr(1))> is also itself, as the adjustment is 0+1-0 .. C<uc(chr(96))> is 96. Requiring this simple adjustment allows the returned arrays to be significantly smaller than otherwise, up to a factor of 10, speeding up searching through them. =item B<C<al>> means that some of the map array elements have the form given by C<"a">, and the rest are ordered lists of code points. For example, in: my ($uppers_ranges_ref, $uppers_maps_ref, $format) = prop_invmap("Uppercase_Mapping"); the returned arrays look like this: @$uppers_ranges_ref @$uppers_maps_ref 0 0 97 65 123 0 181 924 182 0 ... 0x0149 [ 0x02BC 0x004E ] 0x014A 0 0x014B 330 ... This is the full Uppercase_Mapping property (as opposed to the Simple_Uppercase_Mapping given in the example for format C<"a">). The only difference between the two in the ranges shown is that the code point at 0x0149 (LATIN SMALL LETTER N PRECEDED BY APOSTROPHE) maps to a string of two characters, 0x02BC (MODIFIER LETTER APOSTROPHE) followed by 0x004E (LATIN CAPITAL LETTER N). No adjustments are needed to entries that are references to arrays; each such entry will have exactly one element in its range, so the offset is always 0. =item B<C<ae>> This is like C<"a">, but some elements are the empty string, and should not be adjusted. The one internal Perl property accessible by C<prop_invmap> is of this type: "Perl_Decimal_Digit" returns an inversion map which gives the numeric values that are represented by the Unicode decimal digit characters. Characters that don't represent decimal digits map to the empty string, like so: @digits @values 0x0000 "" 0x0030 0 0x003A: "" 0x0660: 0 0x066A: "" 0x06F0: 0 0x06FA: "" 0x07C0: 0 0x07CA: "" 0x0966: 0 ... This means that the code points from 0 to 0x2F do not represent decimal digits; the code point 0x30 (DIGIT ZERO) represents 0; code point 0x31, (DIGIT ONE), represents 0+1-0 = 1; ... code point 0x39, (DIGIT NINE), represents 0+9-0 = 9; ... code points 0x3A through 0x65F do not represent decimal digits; 0x660 (ARABIC-INDIC DIGIT ZERO), represents 0; ... 0x07C1 (NKO DIGIT ONE), represents 0+1-0 = 1 ... =item B<C<ale>> is a combination of the C<"al"> type and the C<"ae"> type. Some of the map array elements have the forms given by C<"al">, and the rest are the empty string. The property C<NFKC_Casefold> has this form. An example slice is: @$ranges_ref @$maps_ref Note ... 0x00AA 97 FEMININE ORDINAL INDICATOR => 'a' 0x00AB 0 0x00AD SOFT HYPHEN => "" 0x00AE 0 0x00AF [ 0x0020, 0x0304 ] MACRON => SPACE . COMBINING MACRON 0x00B0 0 ... =item B<C<ar>> means that all the elements of the map array are either rational numbers or the string C<"NaN">, meaning "Not a Number". A rational number is either an integer, or two integers separated by a solidus (C<"/">). The second integer represents the denominator of the division implied by the solidus, and is actually always positive, so it is guaranteed not to be 0 and to not to be signed. When the element is a plain integer (without the solidus), it may need to be adjusted to get the correct value by adding the offset, just as other C<"a"> properties. No adjustment is needed for fractions, as the range is guaranteed to have just a single element, and so the offset is always 0. If you want to convert the returned map to entirely scalar numbers, you can use something like this: my ($invlist_ref, $invmap_ref, $format) = prop_invmap($property); if ($format && $format eq "ar") { map { $_ = eval $_ } @$invmap_ref; } Here's some entries from the output of the property "Nv", which has format C<"ar">. @numerics_ranges @numerics_maps Note 0x00 "NaN" 0x30 0 DIGIT 0 .. DIGIT 9 0x3A "NaN" 0xB2 2 SUPERSCRIPTs 2 and 3 0xB4 "NaN" 0xB9 1 SUPERSCRIPT 1 0xBA "NaN" 0xBC 1/4 VULGAR FRACTION 1/4 0xBD 1/2 VULGAR FRACTION 1/2 0xBE 3/4 VULGAR FRACTION 3/4 0xBF "NaN" 0x660 0 ARABIC-INDIC DIGIT ZERO .. NINE 0x66A "NaN" =item B<C<n>> means the Name property. All the elements of the map array are simple scalars, but some of them contain special strings that require more work to get the actual name. Entries such as: CJK UNIFIED IDEOGRAPH-<code point> mean that the name for the code point is "CJK UNIFIED IDEOGRAPH-" with the code point (expressed in hexadecimal) appended to it, like "CJK UNIFIED IDEOGRAPH-3403" (similarly for S<C<CJK COMPATIBILITY IDEOGRAPH-E<lt>code pointE<gt>>>). Also, entries like <hangul syllable> means that the name is algorithmically calculated. This is easily done by the function L<charnames/charnames::viacode(code)>. Note that for control characters (C<Gc=cc>), Unicode's data files have the string "C<E<lt>controlE<gt>>", but the real name of each of these characters is the empty string. This function returns that real name, the empty string. (There are names for these characters, but they are considered aliases, not the Name property name, and are contained in the C<Name_Alias> property.) =item B<C<ad>> means the Decomposition_Mapping property. This property is like C<"al"> properties, except that one of the scalar elements is of the form: <hangul syllable> This signifies that this entry should be replaced by the decompositions for all the code points whose decomposition is algorithmically calculated. (All of them are currently in one range and no others outisde the range are likely to ever be added to Unicode; the C<"n"> format has this same entry.) These can be generated via the function L<Unicode::Normalize::NFD()|Unicode::Normalize>. Note that the mapping is the one that is specified in the Unicode data files, and to get the final decomposition, it may need to be applied recursively. =back Note that a format begins with the letter "a" if and only the property it is for requires adjustments by adding the offsets in multi-element ranges. For all these properties, an entry should be adjusted only if the map is a scalar which is an integer. That is, it must match the regular expression: / ^ -? \d+ $ /xa Further, the first element in a range never needs adjustment, as the adjustment would be just adding 0. A binary search can be used to quickly find a code point in the inversion list, and hence its corresponding mapping. The final element (index [3], assigned to C<$default> in the "block" example) in the four element list returned by this function may be useful for applications that wish to convert the returned inversion map data structure into some other, such as a hash. It gives the mapping that most code points map to under the property. If you establish the convention that any code point not explicitly listed in your data structure maps to this value, you can potentially make your data structure much smaller. As you construct your data structure from the one returned by this function, simply ignore those ranges that map to this value, generally called the "default" value. For example, to convert to the data structure searchable by L</charinrange()>, you can follow this recipe for properties that don't require adjustments: my ($list_ref, $map_ref, $format, $missing) = prop_invmap($property); my @range_list; # Look at each element in the list, but the -2 is needed because we # look at $i+1 in the loop, and the final element is guaranteed to map # to $missing by prop_invmap(), so we would skip it anyway. for my $i (0 .. @$list_ref - 2) { next if $map_ref->[$i] eq $missing; push @range_list, [ $list_ref->[$i], $list_ref->[$i+1], $map_ref->[$i] ]; } print charinrange(\@range_list, $code_point), "\n"; With this, C<charinrange()> will return C<undef> if its input code point maps to C<$missing>. You can avoid this by omitting the C<next> statement, and adding a line after the loop to handle the final element of the inversion map. Similarly, this recipe can be used for properties that do require adjustments: for my $i (0 .. @$list_ref - 2) { next if $map_ref->[$i] eq $missing; # prop_invmap() guarantees that if the mapping is to an array, the # range has just one element, so no need to worry about adjustments. if (ref $map_ref->[$i]) { push @range_list, [ $list_ref->[$i], $list_ref->[$i], $map_ref->[$i] ]; } else { # Otherwise each element is actually mapped to a separate # value, so the range has to be split into single code point # ranges. my $adjustment = 0; # For each code point that gets mapped to something... for my $j ($list_ref->[$i] .. $list_ref->[$i+1] -1 ) { # ... add a range consisting of just it mapping to the # original plus the adjustment, which is incremented for the # next time through the loop, as the offset increases by 1 # for each element in the range push @range_list, [ $j, $j, $map_ref->[$i] + $adjustment++ ]; } } } Note that the inversion maps returned for the C<Case_Folding> and C<Simple_Case_Folding> properties do not include the Turkic-locale mappings. Use L</casefold()> for these. C<prop_invmap> does not know about any user-defined properties, and will return C<undef> if called with one of those. =cut # User-defined properties could be handled with some changes to utf8_heavy.pl; # if done, consideration should be given to the fact that the user subroutine # could return different results with each call, which could lead to some # security issues. # One could store things in memory so they don't have to be recalculated, but # it is unlikely this will be called often, and some properties would take up # significant memory. # These are created by mktables for this routine and stored in unicore/UCD.pl # where their structures are described. our @algorithmic_named_code_points; our $HANGUL_BEGIN; our $HANGUL_COUNT; sub prop_invmap ($) { croak __PACKAGE__, "::prop_invmap: must be called in list context" unless wantarray; my $prop = $_[0]; return unless defined $prop; # Fail internal properties return if $prop =~ /^_/; # The values returned by this function. my (@invlist, @invmap, $format, $missing); # The swash has two components we look at, the base list, and a hash, # named 'SPECIALS', containing any additional members whose mappings don't # fit into the the base list scheme of things. These generally 'override' # any value in the base list for the same code point. my $overrides; require "utf8_heavy.pl"; require "unicore/UCD.pl"; RETRY: # If there are multiple entries for a single code point my $has_multiples = 0; # Try to get the map swash for the property. They have 'To' prepended to # the property name, and 32 means we will accept 32 bit return values. # The 0 means we aren't calling this from tr///. my $swash = utf8::SWASHNEW(__PACKAGE__, "To$prop", undef, 32, 0); # If didn't find it, could be because needs a proxy. And if was the # 'Block' or 'Name' property, use a proxy even if did find it. Finding it # in these cases would be the result of the installation changing mktables # to output the Block or Name tables. The Block table gives block names # in the new-style, and this routine is supposed to return old-style block # names. The Name table is valid, but we need to execute the special code # below to add in the algorithmic-defined name entries. # And NFKCCF needs conversion, so handle that here too. if (ref $swash eq "" || $swash->{'TYPE'} =~ / ^ To (?: Blk | Na | NFKCCF ) $ /x) { # Get the short name of the input property, in standard form my ($second_try) = prop_aliases($prop); return unless $second_try; $second_try = utf8::_loose_name(lc $second_try); if ($second_try eq "in") { # This property is identical to age for inversion map purposes $prop = "age"; goto RETRY; } elsif ($second_try =~ / ^ s ( cf | [ltu] c ) $ /x) { # These properties use just the LIST part of the full mapping, # which includes the simple maps that are otherwise overridden by # the SPECIALS. So all we need do is to not look at the SPECIALS; # set $overrides to indicate that $overrides = -1; # The full name is the simple name stripped of its initial 's' $prop = $second_try =~ s/^s//r; goto RETRY; } elsif ($second_try eq "blk") { # We use the old block names. Just create a fake swash from its # data. _charblocks(); my %blocks; $blocks{'LIST'} = ""; $blocks{'TYPE'} = "ToBlk"; $utf8::SwashInfo{ToBlk}{'missing'} = "No_Block"; $utf8::SwashInfo{ToBlk}{'format'} = "s"; foreach my $block (@BLOCKS) { $blocks{'LIST'} .= sprintf "%x\t%x\t%s\n", $block->[0], $block->[1], $block->[2]; } $swash = \%blocks; } elsif ($second_try eq "na") { # Use the combo file that has all the Name-type properties in it, # extracting just the ones that are for the actual 'Name' # property. And create a fake swash from it. my %names; $names{'LIST'} = ""; my $original = do "unicore/Name.pl"; my $algorithm_names = \@algorithmic_named_code_points; # We need to remove the names from it that are aliases. For that # we need to also read in that table. Create a hash with the keys # being the code points, and the values being a list of the # aliases for the code point key. my ($aliases_code_points, $aliases_maps, undef, undef) = &prop_invmap('Name_Alias'); my %aliases; for (my $i = 0; $i < @$aliases_code_points; $i++) { my $code_point = $aliases_code_points->[$i]; $aliases{$code_point} = $aliases_maps->[$i]; # If not already a list, make it into one, so that later we # can treat things uniformly if (! ref $aliases{$code_point}) { $aliases{$code_point} = [ $aliases{$code_point} ]; } # Remove the alias type from the entry, retaining just the # name. map { s/:.*// } @{$aliases{$code_point}}; } my $i = 0; foreach my $line (split "\n", $original) { my ($hex_code_point, $name) = split "\t", $line; # Weeds out all comments, blank lines, and named sequences next if $hex_code_point =~ /\P{ASCII_HEX_DIGIT}/; my $code_point = hex $hex_code_point; # The name of all controls is the default: the empty string. # The set of controls is immutable, so these hard-coded # constants work. next if $code_point <= 0x9F && ($code_point <= 0x1F || $code_point >= 0x7F); # If this is a name_alias, it isn't a name next if grep { $_ eq $name } @{$aliases{$code_point}}; # If we are beyond where one of the special lines needs to # be inserted ... while ($i < @$algorithm_names && $code_point > $algorithm_names->[$i]->{'low'}) { # ... then insert it, ahead of what we were about to # output $names{'LIST'} .= sprintf "%x\t%x\t%s\n", $algorithm_names->[$i]->{'low'}, $algorithm_names->[$i]->{'high'}, $algorithm_names->[$i]->{'name'}; # Done with this range. $i++; # We loop until all special lines that precede the next # regular one are output. } # Here, is a normal name. $names{'LIST'} .= sprintf "%x\t\t%s\n", $code_point, $name; } # End of loop through all the names $names{'TYPE'} = "ToNa"; $utf8::SwashInfo{ToNa}{'missing'} = ""; $utf8::SwashInfo{ToNa}{'format'} = "n"; $swash = \%names; } elsif ($second_try =~ / ^ ( d [mt] ) $ /x) { # The file is a combination of dt and dm properties. Create a # fake swash from the portion that we want. my $original = do "unicore/Decomposition.pl"; my %decomps; if ($second_try eq 'dt') { $decomps{'TYPE'} = "ToDt"; $utf8::SwashInfo{'ToDt'}{'missing'} = "None"; $utf8::SwashInfo{'ToDt'}{'format'} = "s"; } # 'dm' is handled below, with 'nfkccf' $decomps{'LIST'} = ""; # This property has one special range not in the file: for the # hangul syllables my $done_hangul = 0; # Have we done the hangul range. foreach my $line (split "\n", $original) { my ($hex_lower, $hex_upper, $type_and_map) = split "\t", $line; my $code_point = hex $hex_lower; my $value; my $redo = 0; # The type, enclosed in <...>, precedes the mapping separated # by blanks if ($type_and_map =~ / ^ < ( .* ) > \s+ (.*) $ /x) { $value = ($second_try eq 'dt') ? $1 : $2 } else { # If there is no type specified, it's canonical $value = ($second_try eq 'dt') ? "Canonical" : $type_and_map; } # Insert the hangul range at the appropriate spot. if (! $done_hangul && $code_point > $HANGUL_BEGIN) { $done_hangul = 1; $decomps{'LIST'} .= sprintf "%x\t%x\t%s\n", $HANGUL_BEGIN, $HANGUL_BEGIN + $HANGUL_COUNT - 1, ($second_try eq 'dt') ? "Canonical" : "<hangul syllable>"; } # And append this to our constructed LIST. $decomps{'LIST'} .= "$hex_lower\t$hex_upper\t$value\n"; redo if $redo; } $swash = \%decomps; } elsif ($second_try ne 'nfkccf') { # Don't know this property. Fail. return; } if ($second_try eq 'nfkccf' || $second_try eq 'dm') { # The 'nfkccf' property is stored in the old format for backwards # compatibility for any applications that has read its file # directly before prop_invmap() existed. # And the code above has extracted the 'dm' property from its file # yielding the same format. So here we convert them to adjusted # format for compatibility with the other properties similar to # them. my %revised_swash; # We construct a new converted list. my $list = ""; my @ranges = split "\n", $swash->{'LIST'}; for (my $i = 0; $i < @ranges; $i++) { my ($hex_begin, $hex_end, $map) = split "\t", $ranges[$i]; # The dm property has maps that are space separated sequences # of code points, as well as the special entry "<hangul # syllable>, which also contains a blank. my @map = split " ", $map; if (@map > 1) { # If it's just the special entry, append as-is. if ($map eq '<hangul syllable>') { $list .= "$ranges[$i]\n"; } else { # These should all single-element ranges. croak __PACKAGE__, "::prop_invmap: Not expecting a mapping with multiple code points in a multi-element range, $ranges[$i]" if $hex_end ne ""; # Convert them to decimal, as that's what's expected. $list .= "$hex_begin\t\t" . join(" ", map { hex } @map) . "\n"; } next; } # Here, the mapping doesn't have a blank, is for a single code # point. my $begin = hex $hex_begin; my $end = (defined $hex_end && $hex_end ne "") ? hex $hex_end : $begin; # Again, the output is to be in decimal. my $decimal_map = hex $map; # We know that multi-element ranges with the same mapping # should not be adjusted, as after the adjustment # multi-element ranges are for consecutive increasing code # points. Further, the final element in the list won't be # adjusted, as there is nothing after it to include in the # adjustment if ($begin != $end || $i == @ranges -1) { # So just convert these to single-element ranges foreach my $code_point ($begin .. $end) { $list .= sprintf("%04X\t\t%d\n", $code_point, $decimal_map); } } else { # Here, we have a candidate for adjusting. What we do is # look through the subsequent adjacent elements in the # input. If the map to the next one differs by 1 from the # one before, then we combine into a larger range with the # initial map. Loop doing this until we find one that # can't be combined. my $offset = 0; # How far away are we from the initial # map my $squished = 0; # ? Did we squish at least two # elements together into one range for ( ; $i < @ranges; $i++) { my ($next_hex_begin, $next_hex_end, $next_map) = split "\t", $ranges[$i+1]; # In the case of 'dm', the map may be a sequence of # multiple code points, which are never combined with # another range last if $next_map =~ / /; $offset++; my $next_decimal_map = hex $next_map; # If the next map is not next in sequence, it # shouldn't be combined. last if $next_decimal_map != $decimal_map + $offset; my $next_begin = hex $next_hex_begin; # Likewise, if the next element isn't adjacent to the # previous one, it shouldn't be combined. last if $next_begin != $begin + $offset; my $next_end = (defined $next_hex_end && $next_hex_end ne "") ? hex $next_hex_end : $next_begin; # And finally, if the next element is a multi-element # range, it shouldn't be combined. last if $next_end != $next_begin; # Here, we will combine. Loop to see if we should # combine the next element too. $squished = 1; } if ($squished) { # Here, 'i' is the element number of the last element to # be combined, and the range is single-element, or we # wouldn't be combining. Get it's code point. my ($hex_end, undef, undef) = split "\t", $ranges[$i]; $list .= "$hex_begin\t$hex_end\t$decimal_map\n"; } else { # Here, no combining done. Just appen the initial # (and current) values. $list .= "$hex_begin\t\t$decimal_map\n"; } } } # End of loop constructing the converted list # Finish up the data structure for our converted swash my $type = ($second_try eq 'nfkccf') ? 'ToNFKCCF' : 'ToDm'; $revised_swash{'LIST'} = $list; $revised_swash{'TYPE'} = $type; $revised_swash{'SPECIALS'} = $swash->{'SPECIALS'}; $swash = \%revised_swash; $utf8::SwashInfo{$type}{'missing'} = 0; $utf8::SwashInfo{$type}{'format'} = 'a'; } } if ($swash->{'EXTRAS'}) { carp __PACKAGE__, "::prop_invmap: swash returned for $prop unexpectedly has EXTRAS magic"; return; } # Here, have a valid swash return. Examine it. my $returned_prop = $swash->{'TYPE'}; # All properties but binary ones should have 'missing' and 'format' # entries $missing = $utf8::SwashInfo{$returned_prop}{'missing'}; $missing = 'N' unless defined $missing; $format = $utf8::SwashInfo{$returned_prop}{'format'}; $format = 'b' unless defined $format; my $requires_adjustment = $format =~ /^a/; # The LIST input lines look like: # ... # 0374\t\tCommon # 0375\t0377\tGreek # [3] # 037A\t037D\tGreek # [4] # 037E\t\tCommon # 0384\t\tGreek # ... # # Convert them to like # 0374 => Common # 0375 => Greek # 0378 => $missing # 037A => Greek # 037E => Common # 037F => $missing # 0384 => Greek # # For binary properties, the final non-comment column is absent, and # assumed to be 'Y'. foreach my $range (split "\n", $swash->{'LIST'}) { $range =~ s/ \s* (?: \# .* )? $ //xg; # rmv trailing space, comments # Find the beginning and end of the range on the line my ($hex_begin, $hex_end, $map) = split "\t", $range; my $begin = hex $hex_begin; my $end = (defined $hex_end && $hex_end ne "") ? hex $hex_end : $begin; # Each time through the loop (after the first): # $invlist[-2] contains the beginning of the previous range processed # $invlist[-1] contains the end+1 of the previous range processed # $invmap[-2] contains the value of the previous range processed # $invmap[-1] contains the default value for missing ranges ($missing) # # Thus, things are set up for the typical case of a new non-adjacent # range of non-missings to be added. But, if the new range is # adjacent, it needs to replace the [-1] element; and if the new # range is a multiple value of the previous one, it needs to be added # to the [-2] map element. # The first time through, everything will be empty. If the property # doesn't have a range that begins at 0, add one that maps to $missing if (! @invlist) { if ($begin != 0) { push @invlist, 0; push @invmap, $missing; } } elsif (@invlist > 1 && $invlist[-2] == $begin) { # Here we handle the case where the input has multiple entries for # each code point. mktables should have made sure that each such # range contains only one code point. At this point, $invlist[-1] # is the $missing that was added at the end of the last loop # iteration, and [-2] is the last real input code point, and that # code point is the same as the one we are adding now, making the # new one a multiple entry. Add it to the existing entry, either # by pushing it to the existing list of multiple entries, or # converting the single current entry into a list with both on it. # This is all we need do for this iteration. if ($end != $begin) { croak __PACKAGE__, ":prop_invmap: Multiple maps per code point in '$prop' require single-element ranges: begin=$begin, end=$end, map=$map"; } if (! ref $invmap[-2]) { $invmap[-2] = [ $invmap[-2], $map ]; } else { push @{$invmap[-2]}, $map; } $has_multiples = 1; next; } elsif ($invlist[-1] == $begin) { # If the input isn't in the most compact form, so that there are # two adjacent ranges that map to the same thing, they should be # combined (EXCEPT where the arrays require adjustments, in which # case everything is already set up correctly). This happens in # our constructed dt mapping, as Element [-2] is the map for the # latest range so far processed. Just set the beginning point of # the map to $missing (in invlist[-1]) to 1 beyond where this # range ends. For example, in # 12\t13\tXYZ # 14\t17\tXYZ # we have set it up so that it looks like # 12 => XYZ # 14 => $missing # # We now see that it should be # 12 => XYZ # 18 => $missing if (! $requires_adjustment && @invlist > 1 && ( (defined $map) ? $invmap[-2] eq $map : $invmap[-2] eq 'Y')) { $invlist[-1] = $end + 1; next; } # Here, the range started in the previous iteration that maps to # $missing starts at the same code point as this range. That # means there is no gap to fill that that range was intended for, # so we just pop it off the parallel arrays. pop @invlist; pop @invmap; } # Add the range beginning, and the range's map. push @invlist, $begin; if ($returned_prop eq 'ToDm') { # The decomposition maps are either a line like <hangul syllable> # which are to be taken as is; or a sequence of code points in hex # and separated by blanks. Convert them to decimal, and if there # is more than one, use an anonymous array as the map. if ($map =~ /^ < /x) { push @invmap, $map; } else { my @map = split " ", $map; if (@map == 1) { push @invmap, $map[0]; } else { push @invmap, \@map; } } } else { # Otherwise, convert hex formatted list entries to decimal; add a # 'Y' map for the missing value in binary properties, or # otherwise, use the input map unchanged. $map = ($format eq 'x') ? hex $map : $format eq 'b' ? 'Y' : $map; push @invmap, $map; } # We just started a range. It ends with $end. The gap between it and # the next element in the list must be filled with a range that maps # to the default value. If there is no gap, the next iteration will # pop this, unless there is no next iteration, and we have filled all # of the Unicode code space, so check for that and skip. if ($end < $MAX_UNICODE_CODEPOINT) { push @invlist, $end + 1; push @invmap, $missing; } } # If the property is empty, make all code points use the value for missing # ones. if (! @invlist) { push @invlist, 0; push @invmap, $missing; } # And add in standard element that all non-Unicode code points map to: # $missing push @invlist, $MAX_UNICODE_CODEPOINT + 1; push @invmap, $missing; # The second component of the map are those values that require # non-standard specification, stored in SPECIALS. These override any # duplicate code points in LIST. If we are using a proxy, we may have # already set $overrides based on the proxy. $overrides = $swash->{'SPECIALS'} unless defined $overrides; if ($overrides) { # A negative $overrides implies that the SPECIALS should be ignored, # and a simple 'a' list is the value. if ($overrides < 0) { $format = 'a'; } else { # Currently, all overrides are for properties that normally map to # single code points, but now some will map to lists of code # points (but there is an exception case handled below). $format = 'al'; # Look through the overrides. foreach my $cp_maybe_utf8 (keys %$overrides) { my $cp; my @map; # If the overrides came from SPECIALS, the code point keys are # packed UTF-8. if ($overrides == $swash->{'SPECIALS'}) { $cp = unpack("C0U", $cp_maybe_utf8); @map = unpack "U0U*", $swash->{'SPECIALS'}{$cp_maybe_utf8}; # The empty string will show up unpacked as an empty # array. $format = 'ale' if @map == 0; } else { # But if we generated the overrides, we didn't bother to # pack them, and we, so far, do this only for properties # that are 'a' ones. $cp = $cp_maybe_utf8; @map = hex $overrides->{$cp}; $format = 'a'; } # Find the range that the override applies to. my $i = _search_invlist(\@invlist, $cp); if ($cp < $invlist[$i] || $cp >= $invlist[$i + 1]) { croak __PACKAGE__, "::prop_invmap: wrong_range, cp=$cp; i=$i, current=$invlist[$i]; next=$invlist[$i + 1]" } # And what that range currently maps to my $cur_map = $invmap[$i]; # If there is a gap between the next range and the code point # we are overriding, we have to add elements to both arrays to # fill that gap, using the map that applies to it, which is # $cur_map, since it is part of the current range. if ($invlist[$i + 1] > $cp + 1) { #use feature 'say'; #say "Before splice:"; #say 'i-2=[', $i-2, ']', sprintf("%04X maps to %s", $invlist[$i-2], $invmap[$i-2]) if $i >= 2; #say 'i-1=[', $i-1, ']', sprintf("%04X maps to %s", $invlist[$i-1], $invmap[$i-1]) if $i >= 1; #say 'i =[', $i, ']', sprintf("%04X maps to %s", $invlist[$i], $invmap[$i]); #say 'i+1=[', $i+1, ']', sprintf("%04X maps to %s", $invlist[$i+1], $invmap[$i+1]) if $i < @invlist + 1; #say 'i+2=[', $i+2, ']', sprintf("%04X maps to %s", $invlist[$i+2], $invmap[$i+2]) if $i < @invlist + 2; splice @invlist, $i + 1, 0, $cp + 1; splice @invmap, $i + 1, 0, $cur_map; #say "After splice:"; #say 'i-2=[', $i-2, ']', sprintf("%04X maps to %s", $invlist[$i-2], $invmap[$i-2]) if $i >= 2; #say 'i-1=[', $i-1, ']', sprintf("%04X maps to %s", $invlist[$i-1], $invmap[$i-1]) if $i >= 1; #say 'i =[', $i, ']', sprintf("%04X maps to %s", $invlist[$i], $invmap[$i]); #say 'i+1=[', $i+1, ']', sprintf("%04X maps to %s", $invlist[$i+1], $invmap[$i+1]) if $i < @invlist + 1; #say 'i+2=[', $i+2, ']', sprintf("%04X maps to %s", $invlist[$i+2], $invmap[$i+2]) if $i < @invlist + 2; } # If the remaining portion of the range is multiple code # points (ending with the one we are replacing, guaranteed by # the earlier splice). We must split it into two if ($invlist[$i] < $cp) { $i++; # Compensate for the new element #use feature 'say'; #say "Before splice:"; #say 'i-2=[', $i-2, ']', sprintf("%04X maps to %s", $invlist[$i-2], $invmap[$i-2]) if $i >= 2; #say 'i-1=[', $i-1, ']', sprintf("%04X maps to %s", $invlist[$i-1], $invmap[$i-1]) if $i >= 1; #say 'i =[', $i, ']', sprintf("%04X maps to %s", $invlist[$i], $invmap[$i]); #say 'i+1=[', $i+1, ']', sprintf("%04X maps to %s", $invlist[$i+1], $invmap[$i+1]) if $i < @invlist + 1; #say 'i+2=[', $i+2, ']', sprintf("%04X maps to %s", $invlist[$i+2], $invmap[$i+2]) if $i < @invlist + 2; splice @invlist, $i, 0, $cp; splice @invmap, $i, 0, 'dummy'; #say "After splice:"; #say 'i-2=[', $i-2, ']', sprintf("%04X maps to %s", $invlist[$i-2], $invmap[$i-2]) if $i >= 2; #say 'i-1=[', $i-1, ']', sprintf("%04X maps to %s", $invlist[$i-1], $invmap[$i-1]) if $i >= 1; #say 'i =[', $i, ']', sprintf("%04X maps to %s", $invlist[$i], $invmap[$i]); #say 'i+1=[', $i+1, ']', sprintf("%04X maps to %s", $invlist[$i+1], $invmap[$i+1]) if $i < @invlist + 1; #say 'i+2=[', $i+2, ']', sprintf("%04X maps to %s", $invlist[$i+2], $invmap[$i+2]) if $i < @invlist + 2; } # Here, the range we are overriding contains a single code # point. The result could be the empty string, a single # value, or a list. If the last case, we use an anonymous # array. $invmap[$i] = (scalar @map == 0) ? "" : (scalar @map > 1) ? \@map : $map[0]; } } } elsif ($format eq 'x') { # All hex-valued properties are really to code points, and have been # converted to decimal. $format = 's'; } elsif ($returned_prop eq 'ToDm') { $format = 'ad'; } elsif ($format eq 'sw') { # blank-separated elements to form a list. map { $_ = [ split " ", $_ ] if $_ =~ / / } @invmap; $format = 'sl'; } elsif ($returned_prop eq 'ToNameAlias') { # This property currently doesn't have any lists, but theoretically # could $format = 'sl'; } elsif ($returned_prop eq 'ToPerlDecimalDigit') { $format = 'ae'; } elsif ($returned_prop eq 'ToNv') { # The one property that has this format is stored as a delta, so needs # to indicate that need to add code point to it. $format = 'ar'; } elsif ($format ne 'n' && $format ne 'a') { # All others are simple scalars $format = 's'; } if ($has_multiples && $format !~ /l/) { croak __PACKAGE__, "::prop_invmap: Wrong format '$format' for prop_invmap('$prop'); should indicate has lists"; } return (\@invlist, \@invmap, $format, $missing); } =head2 Unicode::UCD::UnicodeVersion This returns the version of the Unicode Character Database, in other words, the version of the Unicode standard the database implements. The version is a string of numbers delimited by dots (C<'.'>). =cut my $UNICODEVERSION; sub UnicodeVersion { unless (defined $UNICODEVERSION) { openunicode(\$VERSIONFH, "version"); local $/ = "\n"; chomp($UNICODEVERSION = <$VERSIONFH>); close($VERSIONFH); croak __PACKAGE__, "::VERSION: strange version '$UNICODEVERSION'" unless $UNICODEVERSION =~ /^\d+(?:\.\d+)+$/; } return $UNICODEVERSION; } =head2 B<Blocks versus Scripts> The difference between a block and a script is that scripts are closer to the linguistic notion of a set of code points required to present languages, while block is more of an artifact of the Unicode code point numbering and separation into blocks of (mostly) 256 code points. For example the Latin B<script> is spread over several B<blocks>, such as C<Basic Latin>, C<Latin 1 Supplement>, C<Latin Extended-A>, and C<Latin Extended-B>. On the other hand, the Latin script does not contain all the characters of the C<Basic Latin> block (also known as ASCII): it includes only the letters, and not, for example, the digits or the punctuation. For blocks see L<http://www.unicode.org/Public/UNIDATA/Blocks.txt> For scripts see UTR #24: L<http://www.unicode.org/unicode/reports/tr24/> =head2 B<Matching Scripts and Blocks> Scripts are matched with the regular-expression construct C<\p{...}> (e.g. C<\p{Tibetan}> matches characters of the Tibetan script), while C<\p{Blk=...}> is used for blocks (e.g. C<\p{Blk=Tibetan}> matches any of the 256 code points in the Tibetan block). =head2 Old-style versus new-style block names Unicode publishes the names of blocks in two different styles, though the two are equivalent under Unicode's loose matching rules. The original style uses blanks and hyphens in the block names (except for C<No_Block>), like so: Miscellaneous Mathematical Symbols-B The newer style replaces these with underscores, like this: Miscellaneous_Mathematical_Symbols_B This newer style is consistent with the values of other Unicode properties. To preserve backward compatibility, all the functions in Unicode::UCD that return block names (except one) return the old-style ones. That one function, L</prop_value_aliases()> can be used to convert from old-style to new-style: my $new_style = prop_values_aliases("block", $old_style); Perl also has single-form extensions that refer to blocks, C<In_Cyrillic>, meaning C<Block=Cyrillic>. These have always been written in the new style. To convert from new-style to old-style, follow this recipe: $old_style = charblock((prop_invlist("block=$new_style"))[0]); (which finds the range of code points in the block using C<prop_invlist>, gets the lower end of the range (0th element) and then looks up the old name for its block using C<charblock>). Note that starting in Unicode 6.1, many of the block names have shorter synonyms. These are always given in the new style. =head1 BUGS Does not yet support EBCDIC platforms. =head1 AUTHOR Jarkko Hietaniemi. Now maintained by perl5 porters. =cut 1;