unicode::normalize.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "Unicode::Normalize 3"
.TH Unicode::Normalize 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Unicode::Normalize \- Unicode Normalization Forms
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
(1) using function names exported by default:
.PP
.Vb 1
\&  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
.Ve
.PP
(2) using function names exported on request:
.PP
.Vb 1
\&  use Unicode::Normalize \*(Aqnormalize\*(Aq;
\&
\&  $NFD_string  = normalize(\*(AqD\*(Aq,  $string);  # Normalization Form D
\&  $NFC_string  = normalize(\*(AqC\*(Aq,  $string);  # Normalization Form C
\&  $NFKD_string = normalize(\*(AqKD\*(Aq, $string);  # Normalization Form KD
\&  $NFKC_string = normalize(\*(AqKC\*(Aq, $string);  # Normalization Form KC
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Parameters:
.PP
\&\f(CW$string\fR is used as a string under character semantics (see \fIperlunicode\fR).
.PP
\&\f(CW$code_point\fR should be an unsigned integer representing a Unicode code point.
.PP
Note: Between \s-1XSUB\s0 and pure Perl, there is an incompatibility
about the interpretation of \f(CW$code_point\fR as a decimal number.
\&\s-1XSUB\s0 converts \f(CW$code_point\fR to an unsigned integer, but pure Perl does not.
Do not use a floating point nor a negative sign in \f(CW$code_point\fR.
.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)"
It 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)"
It 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)"
It 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)"
It returns the Normalization Form \s-1KC\s0 (formed by compatibility decomposition
followed by \fBcanonical\fR composition).
.ie n .IP """$FCD_string = FCD($string)""" 4
.el .IP "\f(CW$FCD_string = FCD($string)\fR" 4
.IX Item "$FCD_string = FCD($string)"
If the given string is in \s-1FCD\s0 (\*(L"Fast C or D\*(R" form; cf. \s-1UTN\s0 #5),
it returns the string without modification; otherwise it returns an \s-1FCD\s0 string.
.Sp
Note: \s-1FCD\s0 is not always unique, then plural forms may be equivalent
each other. \f(CW\*(C`FCD()\*(C'\fR will return one of these equivalent forms.
.ie n .IP """$FCC_string = FCC($string)""" 4
.el .IP "\f(CW$FCC_string = FCC($string)\fR" 4
.IX Item "$FCC_string = FCC($string)"
It returns the \s-1FCC\s0 form (\*(L"Fast C Contiguous\*(R"; cf. \s-1UTN\s0 #5).
.Sp
Note: \s-1FCC\s0 is unique, as well as four normalization forms (NF*).
.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, $string)"
It returns the normalization form of \f(CW$form_name\fR.
.Sp
As \f(CW$form_name\fR, one of the following names must be given.
.Sp
.Vb 4
\&  \*(AqC\*(Aq  or \*(AqNFC\*(Aq  for Normalization Form C  (UAX #15)
\&  \*(AqD\*(Aq  or \*(AqNFD\*(Aq  for Normalization Form D  (UAX #15)
\&  \*(AqKC\*(Aq or \*(AqNFKC\*(Aq for Normalization Form KC (UAX #15)
\&  \*(AqKD\*(Aq or \*(AqNFKD\*(Aq for Normalization Form KD (UAX #15)
\&
\&  \*(AqFCD\*(Aq          for "Fast C or D" Form  (UTN #5)
\&  \*(AqFCC\*(Aq          for "Fast C Contiguous" (UTN #5)
.Ve
.Sh "Decomposition and Composition"
.IX Subsection "Decomposition and Composition"
.ie n .IP """$decomposed_string = decompose($string [, $useCompatMapping])""" 4
.el .IP "\f(CW$decomposed_string = decompose($string [, $useCompatMapping])\fR" 4
.IX Item "$decomposed_string = decompose($string [, $useCompatMapping])"
It returns the concatenation of the decomposition of each character
in the string.
.Sp
If the second parameter (a boolean) is omitted or false,
the decomposition is canonical decomposition;
if the second parameter (a boolean) is true,
the decomposition is compatibility decomposition.
.Sp
The string returned is not always in \s-1NFD/NFKD\s0. Reordering may be required.
.Sp
.Vb 2
\&    $NFD_string  = reorder(decompose($string));       # eq. to NFD()
\&    $NFKD_string = reorder(decompose($string, TRUE)); # eq. to NFKD()
.Ve
.ie n .IP """$reordered_string = reorder($string)""" 4
.el .IP "\f(CW$reordered_string = reorder($string)\fR" 4
.IX Item "$reordered_string = reorder($string)"
It returns the result of reordering the combining characters
according to Canonical Ordering Behavior.
.Sp
For example, when you have a list of \s-1NFD/NFKD\s0 strings,
you can get the concatenated \s-1NFD/NFKD\s0 string from them, by saying
.Sp
.Vb 2
\&    $concat_NFD  = reorder(join \*(Aq\*(Aq, @NFD_strings);
\&    $concat_NFKD = reorder(join \*(Aq\*(Aq, @NFKD_strings);
.Ve
.ie n .IP """$composed_string = compose($string)""" 4
.el .IP "\f(CW$composed_string = compose($string)\fR" 4
.IX Item "$composed_string = compose($string)"
It returns the result of canonical composition
without applying any decomposition.