Extending context-free grammars with permutation phrases

Author:

Cameron Robert D.1

Affiliation:

1. Simon Fraser Univ., Burnaby, B.C., Canada

Abstract

A permutation phrase is a grammatical phrase that specifies a syntactic construct as any permutation of a set of constituent elements. Permutation phrases allow for the concise and natural expression of free-order constructs as found in programming languages and notations such as C, Cobol, BibTEX, and Unix command lines. The conciseness and clarity of expression that permutation phrase grammars offer over context-free grammars are illustrated through a case study of the declarations in C. The parsing problem for permutation phrase grammars is considered, and it is shown how efficient linear-time parsing can be achieved for permutation phrase grammars satisfying an extended notion of the LL(1) property.

Publisher

Association for Computing Machinery (ACM)

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