Download Practical Aspects of Declarative Languages: 19th by Yuliya Lierler, Walid Taha PDF

By Yuliya Lierler, Walid Taha

This e-book constitutes the complaints of the nineteenth foreign Symposium on functional elements of Declarative Languages, PADL 2017, held in Paris, France, in January 2017 and collocated with the ACM SIGPLAN Symposium on rules of Programming Languages.
The 14 papers offered during this quantity have been conscientiously reviewed and chosen from 27 submissions.
They care for novel purposes and implementation strategies for all different types of declarative languages, together with yet no longer restricted to good judgment, constraint, and practical languages.

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In programs, PρLogspecific code can be intermixed with the standard Prolog code. The tool is implemented and tested in SWI-Prolog. 1 Introduction PρLog is a tool that combines, on the one hand, the power of logic programming and, on the other hand, the flexibility of strategy-based conditional transformation systems. Its terms are built over function symbols without fixed arity, using four different kinds of variables: for individual terms, for sequences of terms, for function symbols, and for contexts.

The Picat-SAT compiler. , Reppy, J. ) PADL 2016. LNCS, vol. 9585, pp. 48–62. Springer, Cham (2016). doi:10. 1007/978-3-319-28228-2 4 20. : Constraint Solving and Planning with Picat. at 3 Johannes Kepler University, Linz, Austria Abstract. This paper describes PρLog: a tool that combines Prolog with the ρLog calculus. Such a combination brings strategy-controlled conditional transformation rules into logic programming. They operate on sequences of terms. Transformations may lead to several results, which can be explored by backtracking.

Note the Prolog cut at the end. It cuts the alternative ways of computing the same normal form. In fact, Prolog primitives and clauses can be used in PρLog programs. - merge all doubles :: (1, 2, 3, 2, 1) =⇒ s Result. we get a single answer s Result → (1, 2, 3). Instead of the cut, we could define merge all doubles purely in PρLog terms: merge all doubles :: s X =⇒ s Y :first one(nf (merge doubles)) :: s X =⇒ s Y . An Overview of PρLog 37 first one is another PρLog built-in strategy. It applies to a sequence of strategies, finds the first one among them, which successfully transforms the input sequence, and gives back just one result of the transformation.

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