require "rss/utils"
module RSS
class Converter
include Utils
def initialize(to_enc, from_enc=nil)
if "".respond_to?(:encode)
@to_encoding = to_enc
return
end
normalized_to_enc = to_enc.downcase.gsub(/-/, '_')
from_enc ||= 'utf-8'
normalized_from_enc = from_enc.downcase.gsub(/-/, '_')
if normalized_to_enc == normalized_from_enc
def_same_enc()
else
def_diff_enc = "def_to_#{normalized_to_enc}_from_#{normalized_from_enc}"
if respond_to?(def_diff_enc)
__send__(def_diff_enc)
else
def_else_enc(to_enc, from_enc)
end
end
end
def convert(value)
if value.is_a?(String) and value.respond_to?(:encode)
value.encode(@to_encoding)
else
value
end
end
def def_convert(depth=0)
instance_eval(<<-EOC, *get_file_and_line_from_caller(depth))
def convert(value)
if value.kind_of?(String)
#{yield('value')}
else
value
end
end
EOC
end
def def_iconv_convert(to_enc, from_enc, depth=0)
begin
require "iconv"
@iconv = Iconv.new(to_enc, from_enc)
def_convert(depth+1) do |value|
<<-EOC
begin
@iconv.iconv(#{value})
rescue Iconv::Failure
raise ConversionError.new(#{value}, "#{to_enc}", "#{from_enc}")
end
EOC
end
rescue LoadError, ArgumentError, SystemCallError
raise UnknownConversionMethodError.new(to_enc, from_enc)
end
end
def def_else_enc(to_enc, from_enc)
def_iconv_convert(to_enc, from_enc, 0)
end
def def_same_enc()
def_convert do |value|
value
end
end
def def_uconv_convert_if_can(meth, to_enc, from_enc, nkf_arg)
begin
require "uconv"
def_convert(1) do |value|
<<-EOC
begin
Uconv.#{meth}(#{value})
rescue Uconv::Error
raise ConversionError.new(#{value}, "#{to_enc}", "#{from_enc}")
end
EOC
end
rescue LoadError
require 'nkf'
if NKF.const_defined?(:UTF8)
def_convert(1) do |value|
"NKF.nkf(#{nkf_arg.dump}, #{value})"
end
else
def_iconv_convert(to_enc, from_enc, 1)
end
end
end
def def_to_euc_jp_from_utf_8
def_uconv_convert_if_can('u8toeuc', 'EUC-JP', 'UTF-8', '-We')
end
def def_to_utf_8_from_euc_jp
def_uconv_convert_if_can('euctou8', 'UTF-8', 'EUC-JP', '-Ew')
end
def def_to_shift_jis_from_utf_8
def_uconv_convert_if_can('u8tosjis', 'Shift_JIS', 'UTF-8', '-Ws')
end
def def_to_utf_8_from_shift_jis
def_uconv_convert_if_can('sjistou8', 'UTF-8', 'Shift_JIS', '-Sw')
end
def def_to_euc_jp_from_shift_jis
require "nkf"
def_convert do |value|
"NKF.nkf('-Se', #{value})"
end
end
def def_to_shift_jis_from_euc_jp
require "nkf"
def_convert do |value|
"NKF.nkf('-Es', #{value})"
end
end
def def_to_euc_jp_from_iso_2022_jp
require "nkf"
def_convert do |value|
"NKF.nkf('-Je', #{value})"
end
end
def def_to_iso_2022_jp_from_euc_jp
require "nkf"
def_convert do |value|
"NKF.nkf('-Ej', #{value})"
end
end
def def_to_utf_8_from_iso_8859_1
def_convert do |value|
"#{value}.unpack('C*').pack('U*')"
end
end
def def_to_iso_8859_1_from_utf_8
def_convert do |value|
<<-EOC
array_utf8 = #{value}.unpack('U*')
array_enc = []
array_utf8.each do |num|
if num <= 0xFF
array_enc << num
else
array_enc.concat "&\#\#{num};".unpack('C*')
end
end
array_enc.pack('C*')
EOC
end
end
end
end