From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/lib/rss/converter.rb | 170 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 jni/ruby/lib/rss/converter.rb

(limited to 'jni/ruby/lib/rss/converter.rb')

diff --git a/jni/ruby/lib/rss/converter.rb b/jni/ruby/lib/rss/converter.rb
new file mode 100644
index 0000000..3e79eba
--- /dev/null
+++ b/jni/ruby/lib/rss/converter.rb
@@ -0,0 +1,170 @@
+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
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