Code Completion with Code Clones

Code completion is one of the techniques that raise efficiency of implementation. Code completion techniques make up for code lacking in half-written code. Recently, some researchers have proposed techniques using code completion for helping code reuse. However, existing code completion techniques, which complete only code following the half-written code, cannot complete code in the middle of the half-written code. In this research, we investigate the situation where developers forget to write some code and examine whether it is useful to complete the middle code. Also, we propose a new code completion technique with code clone detection techniques in order to complete the middle code. The proposed technique can complete both the middle code and following code by detecting Type-3 code clones of the half-written method. In this research, we have conducted an experiment with subjects to investigate the code that subjects forgot to write. As a result, we have confirmed that most of the subjects forgot to write some code in their given tasks and that it was useful to complete the middle code.