Bottom-up parsing extending context-freeness in a Process Grammar processor

  • Authors:
  • Massimo Marino

  • Affiliations:
  • University of Pisa, Pisa, Italy

  • Venue:
  • ACL '90 Proceedings of the 28th annual meeting on Association for Computational Linguistics
  • Year:
  • 1990

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Abstract

A new approach to bottom-up parsing that extends Augmented Context-Free Grammar to a Process Grammar is formally presented. A Processor Grammar (PG) defines a set of rules suited for bottom-up parsing and conceived as processes that are applied by a PG Processor. The matching phase is a crucial step for process application, and a parsing structure for efficient matching is also presented. The PG Processor is composed of a process scheduler that allows immediate constituent analysis of structures, and behaves in a non-deterministic fashion. On the other side, the PG offers means for implementing specific parsing strategies improving the lack of determinism innate in the processor.