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Improving Prolog programs: Refactoring for Prolog

Alexander Serebrenik·Tom Schrijvers·Bart Demoen
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Abstract

Refactoring is an established technique from the object-oriented (OO) programming community to restructure code: it aims at improving software readability, maintainability and extensibility. Although refactoring is not tied to the OO-paradigm in particular, its ideas have not been applied to Logic Programming until now. This paper applies the ideas of refactoring to Prolog programs. A catalogue is presented listing refactorings classified according to scope. Some of the refactorings have been adapted from the OO-paradigm, while others have been specifically designed for Prolog. The discrepancy between intended and operational semantics in Prolog is also addressed by some of the refactorings. In addition, ViPReSS, a semi-automatic refactoring browser, is discussed and the experience with applying ViPReSS to a large Prolog legacy system is reported. The main conclusion is that refactoring is both a viable technique in Prolog and a rather desirable one.

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Alexander Serebrenik, Tom Schrijvers, Bart Demoen. 2007-02-14. Improving Prolog programs: Refactoring for Prolog. https://arxiv.org/abs/cs/0702083

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