# <!-- rdoc-file=ext/nkf/nkf.c -->
# NKF - Ruby extension for Network Kanji Filter
#
# ## Description
#
# This is a Ruby Extension version of nkf (Network Kanji Filter). It converts
# the first argument and returns converted result. Conversion details are
# specified by flags as the first argument.
#
# **Nkf** is a yet another kanji code converter among networks, hosts and
# terminals. It converts input kanji code to designated kanji code such as
# ISO-2022-JP, Shift_JIS, EUC-JP, UTF-8 or UTF-16.
#
# One of the most unique faculty of **nkf** is the guess of the input kanji
# encodings. It currently recognizes ISO-2022-JP, Shift_JIS, EUC-JP, UTF-8 and
# UTF-16. So users needn't set the input kanji code explicitly.
#
# By default, X0201 kana is converted into X0208 kana. For X0201 kana, SO/SI,
# SSO and ESC-(-I methods are supported. For automatic code detection, nkf
# assumes no X0201 kana in Shift_JIS. To accept X0201 in Shift_JIS, use **-X**,
# **-x** or **-S**.
#
# ## Flags
#
# ### -b -u
#
# Output is buffered (DEFAULT), Output is unbuffered.
#
# ### -j -s -e -w -w16 -w32
#
# Output code is ISO-2022-JP (7bit JIS), Shift_JIS, EUC-JP, UTF-8N, UTF-16BE,
# UTF-32BE. Without this option and compile option, ISO-2022-JP is assumed.
#
# ### -J -S -E -W -W16 -W32
#
# Input assumption is JIS 7 bit, Shift_JIS, EUC-JP, UTF-8, UTF-16, UTF-32.
#
# #### -J
#
# Assume  JIS input. It also accepts EUC-JP. This is the default. This flag does
# not exclude Shift_JIS.
#
# #### -S
#
# Assume Shift_JIS and X0201 kana input. It also accepts JIS. EUC-JP is
# recognized as X0201 kana. Without **-x** flag, X0201 kana (halfwidth kana) is
# converted into X0208.
#
# #### -E
#
# Assume EUC-JP input. It also accepts JIS. Same as -J.
#
# ### -t
#
# No conversion.
#
# ### -i_
#
# Output sequence to designate JIS-kanji. (DEFAULT B)
#
# ### -o_
#
# Output sequence to designate ASCII. (DEFAULT B)
#
# ### -r
#
# {de/en}crypt ROT13/47
#
# ### -h[123] --hiragana --katakana --katakana-hiragana
#
# -h1 --hiragana
# :   Katakana to Hiragana conversion.
#
# -h2 --katakana
# :   Hiragana to Katakana conversion.
#
# -h3 --katakana-hiragana
# :   Katakana to Hiragana and Hiragana to Katakana conversion.
#
#
# ### -T
#
# Text mode output (MS-DOS)
#
# ### -l
#
# ISO8859-1 (Latin-1) support
#
# ### -f[`m` [- `n`]]
#
# Folding on `m` length with `n` margin in a line. Without this option, fold
# length is 60 and fold margin is 10.
#
# ### -F
#
# New line preserving line folding.
#
# ### -Z[0-3]
#
# Convert X0208 alphabet (Fullwidth Alphabets) to ASCII.
#
# -Z -Z0
# :   Convert X0208 alphabet to ASCII.
#
# -Z1
# :   Converts X0208 kankaku to single ASCII space.
#
# -Z2
# :   Converts X0208 kankaku to double ASCII spaces.
#
# -Z3
# :   Replacing Fullwidth >, <, ", & into '&gt;', '&lt;', '&quot;', '&amp;' as
#     in HTML.
#
#
# ### -X -x
#
# Assume X0201 kana in MS-Kanji. With **-X** or without this option, X0201 is
# converted into X0208 Kana. With **-x**, try to preserve X0208 kana and do not
# convert X0201 kana to X0208. In JIS output, ESC-(-I is used. In EUC output,
# SSO is used.
#
# ### -B[0-2]
#
# Assume broken JIS-Kanji input, which lost ESC. Useful when your site is using
# old B-News Nihongo patch.
#
# -B1
# :   allows any char after ESC-( or ESC-$.
#
# -B2
# :   forces ASCII after NL.
#
#
# ### -I
#
# Replacing non iso-2022-jp char into a geta character (substitute character in
# Japanese).
#
# ### -d -c
#
# Delete r in line feed, Add r in line feed.
#
# ### -m[BQN0]
#
# MIME ISO-2022-JP/ISO8859-1 decode. (DEFAULT) To see ISO8859-1 (Latin-1) -l is
# necessary.
#
# -mB
# :   Decode MIME base64 encoded stream. Remove header or other part before
#
# conversion.
#
# -mQ
# :   Decode MIME quoted stream. '_' in quoted stream is converted to space.
#
# -mN
# :   Non-strict decoding.
#
# It allows line break in the middle of the base64 encoding.
#
# -m0
# :   No MIME decode.
#
#
# ### -M
#
# MIME encode. Header style. All ASCII code and control characters are intact.
# Kanji conversion is performed before encoding, so this cannot be used as a
# picture encoder.
#
# -MB
# :   MIME encode Base64 stream.
#
# -MQ
# :   Perform quoted encoding.
#
#
# ### -l
#
# Input and output code is ISO8859-1 (Latin-1) and ISO-2022-JP. **-s**, **-e**
# and **-x** are not compatible with this option.
#
# ### -L[uwm]
#
# new line mode Without this option, nkf doesn't convert line breaks.
#
# -Lu
# :   unix (LF)
#
# -Lw
# :   windows (CRLF)
#
# -Lm
# :   mac (CR)
#
#
# ### --fj --unix --mac --msdos --windows
#
# convert for these system
#
# ### --jis --euc --sjis --mime --base64
#
# convert for named code
#
# ### --jis-input --euc-input --sjis-input --mime-input --base64-input
#
# assume input system
#
# ### --ic=`input codeset` --oc=`output codeset`
#
# Set the input or output codeset. NKF supports following codesets and those
# codeset name are case insensitive.
#
# ISO-2022-JP
# :   a.k.a. RFC1468, 7bit JIS, JUNET
#
# EUC-JP (eucJP-nkf)
# :   a.k.a. AT&T JIS, Japanese EUC, UJIS
#
# eucJP-ascii
# :   a.k.a. x-eucjp-open-19970715-ascii
#
# eucJP-ms
# :   a.k.a. x-eucjp-open-19970715-ms
#
# CP51932
# :   Microsoft Version of EUC-JP.
#
# Shift_JIS
# :   SJIS, MS-Kanji
#
# Windows-31J
# :   a.k.a. CP932
#
# UTF-8
# :   same as UTF-8N
#
# UTF-8N
# :   UTF-8 without BOM
#
# UTF-8-BOM
# :   UTF-8 with BOM
#
# UTF-16
# :   same as UTF-16BE
#
# UTF-16BE
# :   UTF-16 Big Endian without BOM
#
# UTF-16BE-BOM
# :   UTF-16 Big Endian with BOM
#
# UTF-16LE
# :   UTF-16 Little Endian without BOM
#
# UTF-16LE-BOM
# :   UTF-16 Little Endian with BOM
#
# UTF-32
# :   same as UTF-32BE
#
# UTF-32BE
# :   UTF-32 Big Endian without BOM
#
# UTF-32BE-BOM
# :   UTF-32 Big Endian with BOM
#
# UTF-32LE
# :   UTF-32 Little Endian without BOM
#
# UTF-32LE-BOM
# :   UTF-32 Little Endian with BOM
#
# UTF8-MAC
# :   NKDed UTF-8, a.k.a. UTF8-NFD (input only)
#
#
# ### --fb-{skip, html, xml, perl, java, subchar}
#
# Specify the way that nkf handles unassigned characters. Without this option,
# --fb-skip is assumed.
#
# ### --prefix= `escape character` `target character` ..
#
# When nkf converts to Shift_JIS, nkf adds a specified escape character to
# specified 2nd byte of Shift_JIS characters. 1st byte of argument is the escape
# character and following bytes are target characters.
#
# ### --no-cp932ext
#
# Handle the characters extended in CP932 as unassigned characters.
#
# ## --no-best-fit-chars
#
# When Unicode to Encoded byte conversion, don't convert characters which is not
# round trip safe. When Unicode to Unicode conversion, with this and -x option,
# nkf can be used as UTF converter. (In other words, without this and -x option,
# nkf doesn't save some characters)
#
# When nkf convert string which related to path, you should use this option.
#
# ### --cap-input
#
# Decode hex encoded characters.
#
# ### --url-input
#
# Unescape percent escaped characters.
#
# ### --
#
# Ignore rest of -option.
#
module NKF
  # <!--
  #   rdoc-file=ext/nkf/nkf.c
  #   - NKF.guess(str)  => encoding
  # -->
  # Returns guessed encoding of *str* by nkf routine.
  #
  def self.guess: (String str) -> Encoding

  # <!--
  #   rdoc-file=ext/nkf/nkf.c
  #   - NKF.nkf(opt, str)   => string
  # -->
  # Convert *str* and return converted result. Conversion details are specified by
  # *opt* as String.
  #
  #     require 'nkf'
  #     output = NKF.nkf("-s", input)
  #
  def self.nkf: (String opt, String str) -> String
end

NKF::ASCII: Encoding

NKF::AUTO: nil

NKF::BINARY: Encoding

NKF::EUC: Encoding

NKF::JIS: Encoding

# <!-- rdoc-file=ext/nkf/nkf.c -->
# Release date of nkf
#
NKF::NKF_RELEASE_DATE: String

# <!-- rdoc-file=ext/nkf/nkf.c -->
# Version of nkf
#
NKF::NKF_VERSION: String

NKF::NOCONV: nil

NKF::SJIS: Encoding

NKF::UNKNOWN: nil

NKF::UTF16: Encoding

NKF::UTF32: Encoding

NKF::UTF8: Encoding

# <!-- rdoc-file=ext/nkf/nkf.c -->
# Full version string of nkf
#
NKF::VERSION: String
