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  • Development of Program Difference Tool Based on Tree Mapping

    Lin LIAN  Minoru AIZAWA  Katsuro INOUE  Koji TORII  

     
    PAPER-Software Systems

      Vol:
    E78-D No:10
      Page(s):
    1261-1268

    In the program development process, it is ofren necessary for programmers to know the differences between two programs, or two different versions of a program. Since programs have structures such as iteration statement and selection statement, applying text-based tools such as UNIX diff to identify the differences may produce unsatisfactory results. In this paper, we exploit a tree as the internal representation of a program, obtain the mapping between two trees and display the program differences visually based on the mapping and pretty-printing technique so that the structural differences can be identified immediately.