# frozen_string_literal: false

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#

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# kconv.rb - Kanji Converter.

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# $Id$

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#

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# ----

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#

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# kconv.rb implements the Kconv class for Kanji Converter. Additionally,

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# some methods in String classes are added to allow easy conversion.

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#

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require 'nkf'

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#

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# Kanji Converter for Ruby.

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#

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module Kconv

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#

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# Public Constants

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#

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#Constant of Encoding

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# Auto-Detect

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AUTO = NKF::AUTO

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# ISO-2022-JP

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JIS = NKF::JIS

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# EUC-JP

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EUC = NKF::EUC

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# Shift_JIS

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SJIS = NKF::SJIS

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# BINARY

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BINARY = NKF::BINARY

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# NOCONV

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NOCONV = NKF::NOCONV

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# ASCII

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ASCII = NKF::ASCII

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# UTF-8

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UTF8 = NKF::UTF8

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# UTF-16

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UTF16 = NKF::UTF16

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# UTF-32

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UTF32 = NKF::UTF32

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# UNKNOWN

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UNKNOWN = NKF::UNKNOWN

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#

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# Public Methods

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#

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# call-seq:

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# Kconv.kconv(str, to_enc, from_enc=nil)

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#

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# Convert <code>str</code> to <code>to_enc</code>.

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# <code>to_enc</code> and <code>from_enc</code> are given as constants of Kconv or Encoding objects.

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def kconv(str, to_enc, from_enc=nil)

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opt = ''

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opt += ' --ic=' + from_enc.to_s if from_enc

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opt += ' --oc=' + to_enc.to_s if to_enc

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::NKF::nkf(opt, str)

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end

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module_function :kconv

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#

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# Encode to

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#

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# call-seq:

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# Kconv.tojis(str) => string

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#

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# Convert <code>str</code> to ISO-2022-JP

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def tojis(str)

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kconv(str, JIS)

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end

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module_function :tojis

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# call-seq:

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# Kconv.toeuc(str) => string

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#

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# Convert <code>str</code> to EUC-JP

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def toeuc(str)

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kconv(str, EUC)

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end

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module_function :toeuc

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# call-seq:

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# Kconv.tosjis(str) => string

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#

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# Convert <code>str</code> to Shift_JIS

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def tosjis(str)

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kconv(str, SJIS)

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end

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module_function :tosjis

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# call-seq:

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# Kconv.toutf8(str) => string

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#

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# Convert <code>str</code> to UTF-8

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def toutf8(str)

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kconv(str, UTF8)

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end

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module_function :toutf8

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# call-seq:

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# Kconv.toutf16(str) => string

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#

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# Convert <code>str</code> to UTF-16

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def toutf16(str)

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kconv(str, UTF16)

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end

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module_function :toutf16

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# call-seq:

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# Kconv.toutf32(str) => string

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#

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# Convert <code>str</code> to UTF-32

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def toutf32(str)

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kconv(str, UTF32)

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end

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module_function :toutf32

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# call-seq:

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# Kconv.tolocale => string

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#

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# Convert <code>self</code> to locale encoding

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def tolocale(str)

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kconv(str, Encoding.locale_charmap)

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end

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module_function :tolocale

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#

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# guess

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#

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# call-seq:

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# Kconv.guess(str) => encoding

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#

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# Guess input encoding by NKF.guess

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def guess(str)

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::NKF::guess(str)

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end

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module_function :guess

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#

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# isEncoding

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#

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# call-seq:

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# Kconv.iseuc(str) => true or false

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#

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# Returns whether input encoding is EUC-JP or not.

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#

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# *Note* don't expect this return value is MatchData.

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def iseuc(str)

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str.dup.force_encoding(EUC).valid_encoding?

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end

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module_function :iseuc

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# call-seq:

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# Kconv.issjis(str) => true or false

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#

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# Returns whether input encoding is Shift_JIS or not.

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def issjis(str)

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str.dup.force_encoding(SJIS).valid_encoding?

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end

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module_function :issjis

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# call-seq:

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# Kconv.isjis(str) => true or false

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#

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# Returns whether input encoding is ISO-2022-JP or not.

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def isjis(str)

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/\A [\t\n\r\x20-\x7E]*

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(?:

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(?:\x1b \x28 I [\x21-\x7E]*

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|\x1b \x28 J [\x21-\x7E]*

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|\x1b \x24 @ (?:[\x21-\x7E]{2})*

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|\x1b \x24 B (?:[\x21-\x7E]{2})*

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|\x1b \x24 \x28 D (?:[\x21-\x7E]{2})*

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)*

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\x1b \x28 B [\t\n\r\x20-\x7E]*

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)*

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\z/nox =~ str.dup.force_encoding('BINARY') ? true : false

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end

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module_function :isjis

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# call-seq:

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# Kconv.isutf8(str) => true or false

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#

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# Returns whether input encoding is UTF-8 or not.

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def isutf8(str)

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str.dup.force_encoding(UTF8).valid_encoding?

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end

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module_function :isutf8

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end

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class String

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# call-seq:

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# String#kconv(to_enc, from_enc)

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#

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# Convert <code>self</code> to <code>to_enc</code>.

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# <code>to_enc</code> and <code>from_enc</code> are given as constants of Kconv or Encoding objects.

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def kconv(to_enc, from_enc=nil)

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from_enc = self.encoding if !from_enc && self.encoding != Encoding.list[0]

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Kconv::kconv(self, to_enc, from_enc)

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end

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#

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# to Encoding

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#

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# call-seq:

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# String#tojis => string

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#

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# Convert <code>self</code> to ISO-2022-JP

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def tojis; Kconv.tojis(self) end

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# call-seq:

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# String#toeuc => string

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#

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# Convert <code>self</code> to EUC-JP

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def toeuc; Kconv.toeuc(self) end

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# call-seq:

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# String#tosjis => string

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#

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# Convert <code>self</code> to Shift_JIS

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def tosjis; Kconv.tosjis(self) end

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# call-seq:

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# String#toutf8 => string

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#

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# Convert <code>self</code> to UTF-8

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def toutf8; Kconv.toutf8(self) end

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# call-seq:

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# String#toutf16 => string

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#

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# Convert <code>self</code> to UTF-16

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def toutf16; Kconv.toutf16(self) end

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# call-seq:

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# String#toutf32 => string

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#

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# Convert <code>self</code> to UTF-32

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def toutf32; Kconv.toutf32(self) end

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# call-seq:

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# String#tolocale => string

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#

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# Convert <code>self</code> to locale encoding

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def tolocale; Kconv.tolocale(self) end

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#

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# is Encoding

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#

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# call-seq:

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# String#iseuc => true or false

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#

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# Returns whether <code>self</code>'s encoding is EUC-JP or not.

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def iseuc; Kconv.iseuc(self) end

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# call-seq:

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# String#issjis => true or false

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#

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# Returns whether <code>self</code>'s encoding is Shift_JIS or not.

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def issjis; Kconv.issjis(self) end

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# call-seq:

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# String#isjis => true or false

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#

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# Returns whether <code>self</code>'s encoding is ISO-2022-JP or not.

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def isjis; Kconv.isjis(self) end

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# call-seq:

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# String#isutf8 => true or false

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#

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# Returns whether <code>self</code>'s encoding is UTF-8 or not.

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def isutf8; Kconv.isutf8(self) end

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end

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