Customized mapping rules for keyRemap4MacBook to switch input source by one touch

private.xml

<?xml version="1.0"?>
<root>
  <item>
    <name>Switch Input Source</name>
    <appendix>Use the right Option key to select the next input source</appendix>
    <identifier>private.switch_input_source_with_right_option</identifier>
    <autogen>--KeyToKey-- KeyCode::OPTION_R, KeyCode::SPACE, ModifierFlag::OPTION_L | ModifierFlag::COMMAND_L</autogen>
  </item>

  <item>
    <name>Switch Input Source</name>
    <appendix>Use the right Command key to select the next input source</appendix>
    <identifier>private.switch_next_input_source_with_right_command</identifier>
    <autogen>--KeyToKey-- KeyCode::COMMAND_R, KeyCode::SPACE, ModifierFlag::OPTION_L | ModifierFlag::COMMAND_L</autogen>
  </item>
</root>

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