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# frozen_string_literal: false
#
# kconv.rb - Kanji Converter.
#
# $Id$
#
# ----
#
# kconv.rb implements the Kconv class for Kanji Converter. Additionally,
# some methods in String classes are added to allow easy conversion.
#
require 'nkf'
#
# Kanji Converter for Ruby.
#
module Kconv
#
# Public Constants
#
#Constant of Encoding
# Auto-Detect
AUTO = NKF::AUTO
# ISO-2022-JP
JIS = NKF::JIS
# EUC-JP
EUC = NKF::EUC
# Shift_JIS
SJIS = NKF::SJIS
# BINARY
BINARY = NKF::BINARY
# NOCONV
NOCONV = NKF::NOCONV
# ASCII
ASCII = NKF::ASCII
# UTF-8
UTF8 = NKF::UTF8
# UTF-16
UTF16 = NKF::UTF16
# UTF-32
UTF32 = NKF::UTF32
# UNKNOWN
UNKNOWN = NKF::UNKNOWN
#
# Public Methods
#
# call-seq:
# Kconv.kconv(str, to_enc, from_enc=nil)
#
# Convert <code>str</code> to <code>to_enc</code>.
# <code>to_enc</code> and <code>from_enc</code> are given as constants of Kconv or Encoding objects.
def kconv(str, to_enc, from_enc=nil)
opt = ''
opt += ' --ic=' + from_enc.to_s if from_enc
opt += ' --oc=' + to_enc.to_s if to_enc
::NKF::nkf(opt, str)
end
module_function :kconv
#
# Encode to
#
# call-seq:
# Kconv.tojis(str) => string
#
# Convert <code>str</code> to ISO-2022-JP
def tojis(str)
kconv(str, JIS)
end
module_function :tojis
# call-seq:
# Kconv.toeuc(str) => string
#
# Convert <code>str</code> to EUC-JP
def toeuc(str)
kconv(str, EUC)
end
module_function :toeuc
# call-seq:
# Kconv.tosjis(str) => string
#
# Convert <code>str</code> to Shift_JIS
def tosjis(str)
kconv(str, SJIS)
end
module_function :tosjis
# call-seq:
# Kconv.toutf8(str) => string
#
# Convert <code>str</code> to UTF-8
def toutf8(str)
kconv(str, UTF8)
end
module_function :toutf8
# call-seq:
# Kconv.toutf16(str) => string
#
# Convert <code>str</code> to UTF-16
def toutf16(str)
kconv(str, UTF16)
end
module_function :toutf16
# call-seq:
# Kconv.toutf32(str) => string
#
# Convert <code>str</code> to UTF-32
def toutf32(str)
kconv(str, UTF32)
end
module_function :toutf32
# call-seq:
# Kconv.tolocale => string
#
# Convert <code>self</code> to locale encoding
def tolocale(str)
kconv(str, Encoding.locale_charmap)
end
module_function :tolocale
#
# guess
#
# call-seq:
# Kconv.guess(str) => encoding
#
# Guess input encoding by NKF.guess
def guess(str)
::NKF::guess(str)
end
module_function :guess
#
# isEncoding
#
# call-seq:
# Kconv.iseuc(str) => true or false
#
# Returns whether input encoding is EUC-JP or not.
#
# *Note* don't expect this return value is MatchData.
def iseuc(str)
str.dup.force_encoding(EUC).valid_encoding?
end
module_function :iseuc
# call-seq:
# Kconv.issjis(str) => true or false
#
# Returns whether input encoding is Shift_JIS or not.
def issjis(str)
str.dup.force_encoding(SJIS).valid_encoding?
end
module_function :issjis
# call-seq:
# Kconv.isjis(str) => true or false
#
# Returns whether input encoding is ISO-2022-JP or not.
def isjis(str)
/\A [\t\n\r\x20-\x7E]*
(?:
(?:\x1b \x28 I [\x21-\x7E]*
|\x1b \x28 J [\x21-\x7E]*
|\x1b \x24 @ (?:[\x21-\x7E]{2})*
|\x1b \x24 B (?:[\x21-\x7E]{2})*
|\x1b \x24 \x28 D (?:[\x21-\x7E]{2})*
)*
\x1b \x28 B [\t\n\r\x20-\x7E]*
)*
\z/nox =~ str.dup.force_encoding('BINARY') ? true : false
end
module_function :isjis
# call-seq:
# Kconv.isutf8(str) => true or false
#
# Returns whether input encoding is UTF-8 or not.
def isutf8(str)
str.dup.force_encoding(UTF8).valid_encoding?
end
module_function :isutf8
end
class String
# call-seq:
# String#kconv(to_enc, from_enc)
#
# Convert <code>self</code> to <code>to_enc</code>.
# <code>to_enc</code> and <code>from_enc</code> are given as constants of Kconv or Encoding objects.
def kconv(to_enc, from_enc=nil)
from_enc = self.encoding if !from_enc && self.encoding != Encoding.list[0]
Kconv::kconv(self, to_enc, from_enc)
end
#
# to Encoding
#
# call-seq:
# String#tojis => string
#
# Convert <code>self</code> to ISO-2022-JP
def tojis; Kconv.tojis(self) end
# call-seq:
# String#toeuc => string
#
# Convert <code>self</code> to EUC-JP
def toeuc; Kconv.toeuc(self) end
# call-seq:
# String#tosjis => string
#
# Convert <code>self</code> to Shift_JIS
def tosjis; Kconv.tosjis(self) end
# call-seq:
# String#toutf8 => string
#
# Convert <code>self</code> to UTF-8
def toutf8; Kconv.toutf8(self) end
# call-seq:
# String#toutf16 => string
#
# Convert <code>self</code> to UTF-16
def toutf16; Kconv.toutf16(self) end
# call-seq:
# String#toutf32 => string
#
# Convert <code>self</code> to UTF-32
def toutf32; Kconv.toutf32(self) end
# call-seq:
# String#tolocale => string
#
# Convert <code>self</code> to locale encoding
def tolocale; Kconv.tolocale(self) end
#
# is Encoding
#
# call-seq:
# String#iseuc => true or false
#
# Returns whether <code>self</code>'s encoding is EUC-JP or not.
def iseuc; Kconv.iseuc(self) end
# call-seq:
# String#issjis => true or false
#
# Returns whether <code>self</code>'s encoding is Shift_JIS or not.
def issjis; Kconv.issjis(self) end
# call-seq:
# String#isjis => true or false
#
# Returns whether <code>self</code>'s encoding is ISO-2022-JP or not.
def isjis; Kconv.isjis(self) end
# call-seq:
# String#isutf8 => true or false
#
# Returns whether <code>self</code>'s encoding is UTF-8 or not.
def isutf8; Kconv.isutf8(self) end
end