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.\" ========================================================================
.IX Title "Unicode::Normalize 3"
.TH Unicode::Normalize 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide"
Unicode::Normalize \- Unicode Normalization Forms
\& use Unicode::Normalize;
\& $NFD_string = NFD($string); # Normalization Form D
\& $NFC_string = NFC($string); # Normalization Form C
\& $NFKD_string = NFKD($string); # Normalization Form KD
\& $NFKC_string = NFKC($string); # Normalization Form KC
\& use Unicode::Normalize 'normalize';
\& $NFD_string = normalize('D', $string); # Normalization Form D
\& $NFC_string = normalize('C', $string); # Normalization Form C
\& $NFKD_string = normalize('KD', $string); # Normalization Form KD
\& $NFKC_string = normalize('KC', $string); # Normalization Form KC
.Sh "Normalization Forms"
.IX Subsection "Normalization Forms"
.ie n .IP """$NFD_string = NFD($string)""" 4
.el .IP "\f(CW$NFD_string = NFD($string)\fR" 4
.IX Item "$NFD_string = NFD($string)"
returns the Normalization Form D (formed by canonical decomposition).
.ie n .IP """$NFC_string = NFC($string)""" 4
.el .IP "\f(CW$NFC_string = NFC($string)\fR" 4
.IX Item "$NFC_string = NFC($string)"
returns the Normalization Form C (formed by canonical decomposition
followed by canonical composition).
.ie n .IP """$NFKD_string = NFKD($string)""" 4
.el .IP "\f(CW$NFKD_string = NFKD($string)\fR" 4
.IX Item "$NFKD_string = NFKD($string)"
returns the Normalization Form \s-1KD\s0 (formed by compatibility decomposition).
.ie n .IP """$NFKC_string = NFKC($string)""" 4
.el .IP "\f(CW$NFKC_string = NFKC($string)\fR" 4
.IX Item "$NFKC_string = NFKC($string)"
returns the Normalization Form \s-1KC\s0 (formed by compatibility decomposition
followed by \fBcanonical\fR composition).
.ie n .IP """$normalized_string = normalize($form_name, $string)""" 4
.el .IP "\f(CW$normalized_string = normalize($form_name, $string)\fR" 4
.IX Item "$normalized_string = normalize($form_name, $string)"
As \f(CW$form_name\fR, one of the following names must be given.
\& 'C' or 'NFC' for Normalization Form C
\& 'D' or 'NFD' for Normalization Form D
\& 'KC' or 'NFKC' for Normalization Form KC
\& 'KD' or 'NFKD' for Normalization Form KD
.Sh "Decomposition and Composition"
.IX Subsection "Decomposition and Composition"
.ie n .IP """$decomposed_string = decompose($string)""" 4
.el .IP "\f(CW$decomposed_string = decompose($string)\fR" 4
.IX Item "$decomposed_string = decompose($string)"
.ie n .IP """$decomposed_string = decompose($string, $useCompatMapping)""" 4
.el .IP "\f(CW$decomposed_string = decompose($string, $useCompatMapping)\fR" 4
.IX Item "$decomposed_string = decompose($string, $useCompatMapping)"
Decompose the specified string and returns the result.
If the second parameter (a boolean) is omitted or false, decomposes it
using the Canonical Decomposition Mapping.
If true, decomposes it using the Compatibility Decomposition Mapping.
The string returned is not always in \s-1NFD/NFKD\s0.
Reordering may be required.
\& $NFD_string = reorder(decompose($string)); # eq. to NFD()
\& $NFKD_string = reorder(decompose($string, TRUE)); # eq. to NFKD()
.ie n .IP """$reordered_string = reorder($string)""" 4
.el .IP "\f(CW$reordered_string = reorder($string)\fR" 4
.IX Item "$reordered_string = reorder($string)"
Reorder the combining characters and the like in the canonical ordering
E.g., when you have a list of \s-1NFD/NFKD\s0 strings,
you can get the concatenated \s-1NFD/NFKD\s0 string from them, saying
\& $concat_NFD = reorder(join '', @NFD_strings);
\& $concat_NFKD = reorder(join '', @NFKD_strings);
.ie n .IP """$composed_string = compose($string)""" 4
.el .IP "\f(CW$composed_string = compose($string)\fR" 4
.IX Item "$composed_string = compose($string)"
Returns the string where composable pairs are composed.
E.g., when you have a \s-1NFD/NFKD\s0 string,
you can get its \s-1NFC/NFKC\s0 string, saying
\& $NFC_string = compose($NFD_string);
\& $NFKC_string = compose($NFKD_string);
.IX Subsection "Quick Check"
(see Annex 8, \s-1UAX\s0 #15; \fIDerivedNormalizationProps.txt\fR)
The following functions check whether the string is in that normalization form.
The result returned will be:
\& YES The string is in that normalization form.
\& NO The string is not in that normalization form.
\& MAYBE Dubious. Maybe yes, maybe no.
.ie n .IP """$result = checkNFD($string)""" 4
.el .IP "\f(CW$result = checkNFD($string)\fR" 4
.IX Item "$result = checkNFD($string)"
returns \f(CW\*(C`YES\*(C'\fR (\f(CW1\fR) or \f(CW\*(C`NO\*(C'\fR (\f(CW\*(C`empty string\*(C'\fR).
.ie n .IP """$result = checkNFC($string)""" 4
.el .IP "\f(CW$result = checkNFC($string)\fR" 4
.IX Item "$result = checkNFC($string)"
returns \f(CW\*(C`YES\*(C'\fR (\f(CW1\fR), \f(CW\*(C`NO\*(C'\fR (\f(CW\*(C`empty string\*(C'\fR), or \f(CW\*(C`MAYBE\*(C'\fR (\f(CW\*(C`undef\*(C'\fR).
.ie n .IP """$result = checkNFKD($string)""" 4
.el .IP "\f(CW$result = checkNFKD($string)\fR" 4
.IX Item "$result = checkNFKD($string)"
returns \f(CW\*(C`YES\*(C'\fR (\f(CW1\fR) or \f(CW\*(C`NO\*(C'\fR (\f(CW\*(C`empty string\*(C'\fR).
.ie n .IP """$result = checkNFKC($string)""" 4
.el .IP "\f(CW$result = checkNFKC($string)\fR" 4
.IX Item "$result = checkNFKC($string)"
returns \f(CW\*(C`YES\*(C'\fR (\f(CW1\fR), \f(CW\*(C`NO\*(C'\fR (\f(CW\*(C`empty string\*(C'\fR), or \f(CW\*(C`MAYBE\*(C'\fR (\f(CW\*(C`undef\*(C'\fR).
.ie n .IP """$result = check($form_name, $string)""" 4
.el .IP "\f(CW$result = check($form_name, $string)\fR" 4
.IX Item "$result = check($form_name, $string)"
returns \f(CW\*(C`YES\*(C'\fR (\f(CW1\fR), \f(CW\*(C`NO\*(C'\fR (\f(CW\*(C`empty string\*(C'\fR), or \f(CW\*(C`MAYBE\*(C'\fR (\f(CW\*(C`undef\*(C'\fR).
\&\f(CW$form_name\fR is alike to that for \f(CW\*(C`normalize()\*(C'\fR.
In the cases of \s-1NFD\s0 and \s-1NFKD\s0, the answer must be either \f(CW\*(C`YES\*(C'\fR or \f(CW\*(C`NO\*(C'\fR.
The answer \f(CW\*(C`MAYBE\*(C'\fR may be returned in the cases of \s-1NFC\s0 and \s-1NFKC\s0.
A \s-1MAYBE\-NFC/NFKC\s0 string should contain at least
one combining character or the like.
For example, \f(CW\*(C`COMBINING ACUTE ACCENT\*(C'\fR has
the \s-1MAYBE_NFC/MAYBE_NFKC\s0 property.
Both \f(CW\*(C`checkNFC("A\eN{COMBINING ACUTE ACCENT}")\*(C'\fR
and \f(CW\*(C`checkNFC("B\eN{COMBINING ACUTE ACCENT}")\*(C'\fR will return \f(CW\*(C`MAYBE\*(C'\fR.
\&\f(CW"A\eN{COMBINING ACUTE ACCENT}"\fR is not in \s-1NFC\s0
(its \s-1NFC\s0 is \f(CW"\eN{LATIN CAPITAL LETTER A WITH ACUTE}"\fR),
while \f(CW"B\eN{COMBINING ACUTE ACCENT}"\fR is in \s-1NFC\s0.
If you want to check exactly, compare the string with its \s-1NFC/NFKC\s0; i.e.,
\& $string eq NFC($string) # more thorough than checkNFC($string)
\& $string eq NFKC($string) # more thorough than checkNFKC($string)
.IX Subsection "Character Data"
These functions are interface of character data used internally.
If you want only to get Unicode normalization forms, you don't need
.ie n .IP """$canonical_decomposed = getCanon($codepoint)""" 4
.el .IP "\f(CW$canonical_decomposed = getCanon($codepoint)\fR" 4
.IX Item "$canonical_decomposed = getCanon($codepoint)"
If the character of the specified codepoint is canonically
decomposable (including Hangul Syllables),
returns the \fBcompletely decomposed\fR string canonically equivalent to it.
If it is not decomposable, returns \f(CW\*(C`undef\*(C'\fR.
.ie n .IP """$compatibility_decomposed = getCompat($codepoint)""" 4
.el .IP "\f(CW$compatibility_decomposed = getCompat($codepoint)\fR" 4
.IX Item "$compatibility_decomposed = getCompat($codepoint)"
If the character of the specified codepoint is compatibility
decomposable (including Hangul Syllables),
returns the \fBcompletely decomposed\fR string compatibility equivalent to it.
If it is not decomposable, returns \f(CW\*(C`undef\*(C'\fR.
.ie n .IP """$codepoint_composite = getComposite($codepoint_here, $codepoint_next)""" 4
.el .IP "\f(CW$codepoint_composite = getComposite($codepoint_here, $codepoint_next)\fR" 4
.IX Item "$codepoint_composite = getComposite($codepoint_here, $codepoint_next)"
If two characters here and next (as codepoints) are composable
(including Hangul Jamo/Syllables and Composition Exclusions),
returns the codepoint of the composite.
If they are not composable, returns \f(CW\*(C`undef\*(C'\fR.
.ie n .IP """$combining_class = getCombinClass($codepoint)""" 4
.el .IP "\f(CW$combining_class = getCombinClass($codepoint)\fR" 4
.IX Item "$combining_class = getCombinClass($codepoint)"
Returns the combining class of the character as an integer.
.ie n .IP """$is_exclusion = isExclusion($codepoint)""" 4
.el .IP "\f(CW$is_exclusion = isExclusion($codepoint)\fR" 4
.IX Item "$is_exclusion = isExclusion($codepoint)"
Returns a boolean whether the character of the specified codepoint
is a composition exclusion.
.ie n .IP """$is_singleton = isSingleton($codepoint)""" 4
.el .IP "\f(CW$is_singleton = isSingleton($codepoint)\fR" 4
.IX Item "$is_singleton = isSingleton($codepoint)"
Returns a boolean whether the character of the specified codepoint is
.ie n .IP """$is_non_startar_decomposition = isNonStDecomp($codepoint)""" 4
.el .IP "\f(CW$is_non_startar_decomposition = isNonStDecomp($codepoint)\fR" 4
.IX Item "$is_non_startar_decomposition = isNonStDecomp($codepoint)"
Returns a boolean whether the canonical decomposition
of the character of the specified codepoint
is a Non-Starter Decomposition.
.ie n .IP """$may_be_composed_with_prev_char = isComp2nd($codepoint)""" 4
.el .IP "\f(CW$may_be_composed_with_prev_char = isComp2nd($codepoint)\fR" 4
.IX Item "$may_be_composed_with_prev_char = isComp2nd($codepoint)"
Returns a boolean whether the character of the specified codepoint
may be composed with the previous one in a certain composition
(including Hangul Compositions, but excluding
Composition Exclusions and Non-Starter Decompositions).
\&\f(CW\*(C`NFC\*(C'\fR, \f(CW\*(C`NFD\*(C'\fR, \f(CW\*(C`NFKC\*(C'\fR, \f(CW\*(C`NFKD\*(C'\fR: by default.
\&\f(CW\*(C`normalize\*(C'\fR and other some functions: on request.
\&\s-1SADAHIRO\s0 Tomoyuki, <SADAHIRO@cpan.org>
\& http://homepage1.nifty.com/nomenclator/perl/
\& Copyright(C) 2001-2002, SADAHIRO Tomoyuki. Japan. All rights reserved.
\& This program is free software; you can redistribute it and/or
\& modify it under the same terms as Perl itself.
.IP "http://www.unicode.org/unicode/reports/tr15/" 4
.IX Item "http://www.unicode.org/unicode/reports/tr15/"
Unicode Normalization Forms \- \s-1UAX\s0 #15
.IP "http://www.unicode.org/Public/UNIDATA/DerivedNormalizationProps.txt" 4
.IX Item "http://www.unicode.org/Public/UNIDATA/DerivedNormalizationProps.txt"
Derived Normalization Properties
projects / OpenSPARC-T2-DV / blob