require File.expand_path('../../../../spec_helper', __FILE__)

with_feature :encoding do
  describe "Encoding::Converter#last_error" do
    it "returns nil when the no conversion has been attempted" do
      ec = Encoding::Converter.new('ascii','utf-8')
      ec.last_error.should be_nil
    end

    it "returns nil when the last conversion did not produce an error" do
      ec = Encoding::Converter.new('ascii','utf-8')
      ec.convert('a'.force_encoding('ascii'))
      ec.last_error.should be_nil
    end

    it "returns nil when #primitive_convert last returned :destination_buffer_full" do
      ec = Encoding::Converter.new("utf-8", "iso-2022-jp")
      ec.primitive_convert("\u{9999}", "", 0, 0, :partial_input => false) \
        .should == :destination_buffer_full
      ec.last_error.should be_nil
    end

    it "returns nil when #primitive_convert last returned :finished" do
      ec = Encoding::Converter.new("utf-8", "iso-8859-1")
      ec.primitive_convert("glark".force_encoding('utf-8'),"").should == :finished
      ec.last_error.should be_nil
    end

    it "returns nil if the last conversion succeeded but the penultimate failed" do
      ec = Encoding::Converter.new("utf-8", "iso-8859-1")
      ec.primitive_convert("\xf1abcd","").should == :invalid_byte_sequence
      ec.primitive_convert("glark".force_encoding('utf-8'),"").should == :finished
      ec.last_error.should be_nil
    end

    it "returns an Encoding::InvalidByteSequenceError when #primitive_convert last returned :invalid_byte_sequence" do
      ec = Encoding::Converter.new("utf-8", "iso-8859-1")
      ec.primitive_convert("\xf1abcd","").should == :invalid_byte_sequence
      ec.last_error.should be_an_instance_of(Encoding::InvalidByteSequenceError)
    end

    it "returns an Encoding::UndefinedConversionError when #primitive_convert last returned :undefined_conversion" do
      ec = Encoding::Converter.new("utf-8", "iso-8859-1")
      ec.primitive_convert("\u{9876}","").should == :undefined_conversion
      ec.last_error.should be_an_instance_of(Encoding::UndefinedConversionError)
    end

    it "returns an Encoding::InvalidByteSequenceError when #primitive_convert last returned :incomplete_input" do
      ec = Encoding::Converter.new("EUC-JP", "ISO-8859-1")
      ec.primitive_convert("\xa4", "", nil, 10).should == :incomplete_input
      ec.last_error.should be_an_instance_of(Encoding::InvalidByteSequenceError)
    end

    it "returns an Encoding::InvalidByteSequenceError when the last call to #convert produced one" do
      ec = Encoding::Converter.new("utf-8", "iso-8859-1")
      exception = nil
      lambda do
        begin
          ec.convert("\xf1abcd")
        rescue Encoding::InvalidByteSequenceError => e
          exception = e
          raise e
        end
      end.should raise_error(Encoding::InvalidByteSequenceError)
      ec.last_error.should be_an_instance_of(Encoding::InvalidByteSequenceError)
      ec.last_error.message.should == exception.message
    end

    it "returns an Encoding::UndefinedConversionError when the last call to #convert produced one" do
      ec = Encoding::Converter.new("utf-8", "iso-8859-1")
      exception = nil
      lambda do
        begin
          ec.convert("\u{9899}")
        rescue Encoding::UndefinedConversionError => e
          exception = e
          raise e
        end
      end.should raise_error(Encoding::UndefinedConversionError)
      ec.last_error.should be_an_instance_of(Encoding::UndefinedConversionError)
      ec.last_error.message.should == exception.message
    end
  end
end
