E. Visser. Scoped dynamic rewrite rules. In M. van den Brand and R. Verma, editors, Rule Based Programming (RULE'01), volume 59/4 of Electronic Notes in Theoretical Computer Science. Elsevier Science Publishers, September 2001. (pdf,psgz)


The applicability of term rewriting to program transformation is limited by the lack of control over rule application and by the context-free nature of rewrite rules. The first problem is addressed by languages supporting user-definable rewriting strategies. This paper addresses the second problem by extending rewriting strategies with scoped dynamic rewrite rules. Dynamic rules are generated at run-time and can access variables available from their definition context. Rules generated within a rule scope are automatically retracted at the end of that scope. The technique is illustrated by means of several program tranformations: bound variable renaming, function inlining, and dead function elimination.