Disambiguation Filters for Scannerless Generalized LR Parsers

Mark G. J. van den Brand, Jeroen Scheerder, Jurgen J. Vinju, Eelco Visser. Disambiguation Filters for Scannerless Generalized LR Parsers. In R. Nigel Horspool, editor, Compiler Construction, 11th International Conference, CC 2002, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2002, Grenoble, France, April 8-12, 2002, Proceedings. Volume 2304 of Lecture Notes in Computer Science, pages 143-158, Springer, 2002. [doi]


In this paper we present the fusion of generalized LR parsing and scannerless parsing. This combination supports syntax definitions in which all aspects (lexical and context-free) of the syntax of a language are defined explicitly in one formalism. Furthermore, there are no restrictions on the class of grammars, thus allowing a natural syntax tree structure. Ambiguities that arise through the use of unrestricted grammars are handled by explicit disambiguation constructs, instead of implicit defaults that are taken by traditional scanner and parser generators. Hence, a syntax definition becomes a full declarative description of a language. Scannerless generalized LR parsing is a viable technique that has been applied in various industrial and academic projects.