# frozen_string_literal: false

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require_relative "utils"

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module RSS

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class Converter

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include Utils

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def initialize(to_enc, from_enc=nil)

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if "".respond_to?(:encode)

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@to_encoding = to_enc

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return

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end

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normalized_to_enc = to_enc.downcase.gsub(/-/, '_')

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from_enc ||= 'utf-8'

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normalized_from_enc = from_enc.downcase.gsub(/-/, '_')

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if normalized_to_enc == normalized_from_enc

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def_same_enc()

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else

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def_diff_enc = "def_to_#{normalized_to_enc}_from_#{normalized_from_enc}"

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if respond_to?(def_diff_enc)

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__send__(def_diff_enc)

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else

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def_else_enc(to_enc, from_enc)

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end

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end

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end

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def convert(value)

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if value.is_a?(String) and value.respond_to?(:encode)

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value.encode(@to_encoding)

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else

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value

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end

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end

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def def_convert(depth=0)

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instance_eval(<<-EOC, *get_file_and_line_from_caller(depth))

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def convert(value)

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if value.kind_of?(String)

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#{yield('value')}

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else

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value

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end

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end

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EOC

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end

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def def_iconv_convert(to_enc, from_enc, depth=0)

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begin

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require "iconv"

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@iconv = Iconv.new(to_enc, from_enc)

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def_convert(depth+1) do |value|

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<<-EOC

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begin

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@iconv.iconv(#{value})

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rescue Iconv::Failure

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raise ConversionError.new(#{value}, "#{to_enc}", "#{from_enc}")

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end

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EOC

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end

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rescue LoadError, ArgumentError, SystemCallError

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raise UnknownConversionMethodError.new(to_enc, from_enc)

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end

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end

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def def_else_enc(to_enc, from_enc)

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def_iconv_convert(to_enc, from_enc, 0)

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end

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def def_same_enc()

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def_convert do |value|

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value

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end

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end

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def def_uconv_convert_if_can(meth, to_enc, from_enc, nkf_arg)

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begin

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require "uconv"

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def_convert(1) do |value|

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<<-EOC

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begin

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Uconv.#{meth}(#{value})

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rescue Uconv::Error

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raise ConversionError.new(#{value}, "#{to_enc}", "#{from_enc}")

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end

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EOC

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end

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rescue LoadError

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require 'nkf'

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if NKF.const_defined?(:UTF8)

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def_convert(1) do |value|

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"NKF.nkf(#{nkf_arg.dump}, #{value})"

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end

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else

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def_iconv_convert(to_enc, from_enc, 1)

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end

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end

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end

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def def_to_euc_jp_from_utf_8

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def_uconv_convert_if_can('u8toeuc', 'EUC-JP', 'UTF-8', '-We')

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end

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def def_to_utf_8_from_euc_jp

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def_uconv_convert_if_can('euctou8', 'UTF-8', 'EUC-JP', '-Ew')

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end

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def def_to_shift_jis_from_utf_8

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def_uconv_convert_if_can('u8tosjis', 'Shift_JIS', 'UTF-8', '-Ws')

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end

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def def_to_utf_8_from_shift_jis

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def_uconv_convert_if_can('sjistou8', 'UTF-8', 'Shift_JIS', '-Sw')

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end

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def def_to_euc_jp_from_shift_jis

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require "nkf"

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def_convert do |value|

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"NKF.nkf('-Se', #{value})"

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end

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end

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def def_to_shift_jis_from_euc_jp

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require "nkf"

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def_convert do |value|

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"NKF.nkf('-Es', #{value})"

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end

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end

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def def_to_euc_jp_from_iso_2022_jp

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require "nkf"

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def_convert do |value|

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"NKF.nkf('-Je', #{value})"

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end

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end

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def def_to_iso_2022_jp_from_euc_jp

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require "nkf"

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def_convert do |value|

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"NKF.nkf('-Ej', #{value})"

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end

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end

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def def_to_utf_8_from_iso_8859_1

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def_convert do |value|

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"#{value}.unpack('C*').pack('U*')"

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end

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end

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def def_to_iso_8859_1_from_utf_8

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def_convert do |value|

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<<-EOC

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array_utf8 = #{value}.unpack('U*')

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array_enc = []

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array_utf8.each do |num|

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if num <= 0xFF

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array_enc << num

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else

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array_enc.concat "&\#\#{num};".unpack('C*')

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end

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end

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array_enc.pack('C*')

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EOC

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end

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end

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end

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end

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