Abstract
Refactoring is an essential and useful practice in developing and maintaining object-oriented software since it improves the design of existing code without changing its external behavior. Therefore, several refactoring tools tend to be integrated into contemporary IDEs. However, these tools represent source code as an abstract syntax tree (AST) and thus their implementations are hard to extend and modify. This paper presents Jrbx, a refactoring tool that uses a fine-grained XML representation of source code and supports stylized manipulations of the representation. Moreover, Jrbx aggressively exploits control flow graphs (CFGs) and program dependence graphs (PDGs) for both precondition checking and change creation. The use of the XML, CFG, and PDG representations makes the implementation of Jrbx more understandable and reusable, and thus facilitates tool developers creating new refactorings and modifying existing ones.
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