1988 | ReviewPaper | Buchkapitel
Jungle evaluation
verfasst von : Annegret Habel, Hans-Jörg Kreowski, Detlef Plump
Erschienen in: Recent Trends in Data Type Specification
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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Jungle evaluation is proposed as a new graph rewriting approach to the evaluation of functional expressions and, in particular, of algebraically specified operations. Jungles — being intuitively forests of coalesced trees with shared substructures — are certain acyclic hypergraphs (or equivalently, bipartite graphs) the nodes and edges of which are labeled with the sorts and operation symbols of a signature. Jungles are manipulated and evaluated by the application of jungle rewrite rules, which generalize equations or, more exactly, term rewrite rules. Indeed, jungle evaluation turns out to be a compromise between term rewriting and graph rewriting displaying some favorable properties: the inefficiency of term rewriting is partly avoided while the possibility of structural induction is maintained, and a good part of the existing graph grammar theory is applicable so that there is some hope that the rich theory of term rewriting is not lost forever without a substitute.